Class / Patent application number | Description | Number of patent applications / Date published |
702145000 | Rotational speed | 84 |
20080262787 | METHOD AND APPARATUS OF MONITORING A MACHINE - A monitoring system for a machine is provided. The machine includes at least one movable member including at least one sensor configured to generate at least one speed measurement of the moveable member. The machine also includes at least one processor coupled in electronic data communication to the sensor. The sensor is configured to generate at least one time stamp value for the at least one speed measurement signal. The at least one processor is configured to generate a plurality of time-stamped speed measurement signals of the at least one moveable member. The processor is further configured to determine a prioritization of the plurality of time-stamped speed measurement signals as a function of at least one predetermined temporal value. | 10-23-2008 |
20090150116 | METHOD FOR AUTOMATICALLY SETTING INITIALLY-ESTIMATED ROTATIONAL FREQUENCY IN MOTOR FREQUENCY MEASURING SYSTEM - A method automatically sets initially-estimated rotational frequency for a motor frequency measuring system based on pulse signals output from an encoder. Initially, a counter is reset to zero, and a count threshold and an initially-estimated rotational frequency are set. The possible motor frequencies are divided into multiple frequency ranges with specific starting frequencies. A pulse width threshold is set according to the initially-estimated rotational frequency. A new motor frequency is calculated by the count threshold and a corresponding elapsed time. The initially-estimated rotational frequency is set to be a frequency in a frequency range higher than the new motor frequency. Therefore, the initially-estimated rotational frequency can be adaptively set according to an updated frequency measurement. Moreover, the count threshold can be monotonously increased with the updated frequency measurement to enhance measurement accuracy. | 06-11-2009 |
20090177433 | Method and apparatus for monitoring the rotational speed of shaft - Method and apparatus for monitoring the rotational speed of a shaft, in particular a shaft having a number of spaced features on or rotating with the shaft. Preferred embodiments of the invention are concerned with methods and apparatuses for processing signals in order to calculate, with high accuracy and a fast response time, the rotational speed of a gas turbine shaft. The invention recognises that it is possible to accurately measure speed between two eddy current sensors ( | 07-09-2009 |
20090177434 | Method and apparatus for monitoring the rotational speed of the shaft of a gas turbine - A method (and corresponding apparatus) for monitoring the rotational speed of the shaft of a gas turbine having a number of spaced blades on or rotating with the shaft. The invention compensates for the errors which arise from the relative movement of turbine blade tips by deriving a correction factor for each blade and continually updating that correction factor. | 07-09-2009 |
20090254300 | System and method for determining position or speed of a commutated DC motor with error correction - A motor control system and method are provided for detecting current ripple in a commutated DC motor and further determining position and speed of the motor based on the detected ripple current. Ripples in the motor current are detected and a ripple frequency is calculated based on the time between successive ripples. A ripple count between successive frequencies is determined and the ripple count is compared to a threshold value, and an estimated ripple frequency is determined from a motor model when the ripple count exceeds the threshold value. A corrected ripple count is calculated from a ratio of the calculated ripple frequency and the estimated ripple frequency, and motor position and motor speed are determined based on the corrected ripple count. | 10-08-2009 |
20100030512 | DETERMINATION AND WIRELESS COMMUNICATION OF SENSED VEHICLE DATA FOR COMPUTING VEHICLE SPEED - The present invention is a system for determining vehicle speed. The system has a sensor mounted on a wheel rotatably mounted on the vehicle for sensing centripetal acceleration of said wheel. The sensor generates a signal indicative of the sensed centripetal acceleration, and is arranged to wirelessly transmit the signal. The system additionally has an electronic control unit mounted on the vehicle. The electronic control unit is arranged to receive the signal and determine the speed of the vehicle based on the sensed centripetal acceleration. | 02-04-2010 |
20100131231 | IMPROVEMENTS RELATING TO VEHICLE SENSORS - A method of identifying a faulty vehicle speed sensor on a vehicle comprises the steps of determining whether or not a wheel of a vehicle is rotating using an alternative sensor attached to that wheel, and in the event that the alternative sensor indicates that the wheel is rotating and the speed sensor does not, indicating that the speed sensor is faulty, in which the alternative sensor comprises at least one pressure sensor associated with a tyre of the vehicle. | 05-27-2010 |
20100198550 | SENSOR SYSTEM FOR SEMICONDUCTOR MANUFACTURING APPARATUS - A chamber monitoring system may include a parallel architecture in which a single sensor control system is coupled to a number of different processing chamber control board sensor lines. In an illustrative embodiment, a single rotation sensor such as a tachometer may reside in a central control unit remote from the processing chambers such that rotation data may be processed by a single system and thereafter routed according to a variety of different network communication protocols to the main system controller, a factory interface, or both. In this and other embodiments, pull-up networks in the central control unit and the chamber control boards are matched so as to reduce electrical signal anomalies such as crowbar effects. The central control unit may be programmed via a main system controller to operate according to user defined parameters, which in turn may enable the system to differentiate between certain operating states. | 08-05-2010 |
20100332180 | METHOD AND DEVICE FOR DETERMINING ONE OR MORE ROTATIONAL SPEEDS OF A TURBOCHARGING DEVICE, IN PARTICULAR FOR AN INTERNAL COMBUSTION ENGINE - A method is described for determining information about a rotational speed of a compressor, in particular a turbocharger, by providing a measuring signal, in particular a microwave measuring signal, which is directed at a compressor impeller of the compressor, so that the measuring signal is reflected on revolving blades of the compressor impeller, detecting the measuring signal reflected by one or more blades, and determining the information about the rotational speed as a function of the reflected measuring signal. | 12-30-2010 |
20110040519 | ESTIMATING ROTOR ANGULAR POSITION AND VELOCITY AND VERIFYING ACCURACY OF POSITION SENSOR OUTPUTS - Methods, system and apparatus are provided for estimating rotor angular position and angular velocity during a position sensor fault, and for verifying the accuracy or inaccuracy of a position sensor's outputs based on the estimated rotor angular position and angular velocity of the rotor following a position sensor fault. | 02-17-2011 |
20110093236 | PROCESSING POSITION-RELATED INPUT DATA FROM A ROTATIONAL MACHINE WHOSE ANGULAR SPEED IS VARIABLE - A data processor and method for processing position-related input data from a rotational machine whose angular speed is variable and providing output data at an output data rate. The processor comprises a time-based over-sampler for over-sampling the input data at an over-sampling rate greater than the output data rate, and a down-sampler for extracting samples of over-sampled data from the over-sampler at the output data rate so as to provide the output data. The down-sampler is responsive to an angular timing signal related to an angular position of the machine for selecting the samples of over-sampled data to extract based on the angular position. Application to a rotational machine whose angular speed is variable, in particular to an internal combustion engine to control engine operating parameters as a function of cylinder pressure. | 04-21-2011 |
20110098968 | SYSTEM AND METHOD FOR VIBRATION ANALYSIS AND PHASE ANALYSIS OF VIBRATION WAVEFORMS USING DYNAMIC STATISTICAL AVERAGING OF TACHOMETER DATA TO ACCURATELY CALCULATE ROTATIONAL SPEED - Vibration analysis is performed on a machine having a variable frequency drive by using a tachometer to monitor rotational speed of the drive shaft and a logic device to calculate speed parameters associated with the drive shaft using the tachometer data. The speed parameters include a maximum speed, a minimum speed, and an average speed of the drive shaft. By correlating the vibration spectra of the motor drive with the speed parameters, machine faults can be identified based upon the energy distribution in the spectra. Further, vibration waveforms from two or more locations on the machine can be sequentially acquired through synchronous triggering by using a pulse edge of a stable tachometer signal. The waveforms can be compared to determine a phase difference to help in identifying any machine faults that may be present. | 04-28-2011 |
20110119022 | Device and Method for Measuring a Shot Force Exerted on a Movable Game Device - For measuring a shot force exerted on a movable game device, a time curve of the acceleration during the shot or of the pressure within the game device during the shot is recorded and processed to obtain an energy measure, said energy measure then serving to provide information about the shot force. | 05-19-2011 |
20110246127 | Method for Determining at Least One Controller Parameter of a Dancer Position Control Element - A method is disclosed for automatically determining at least one controller parameter of a dancer position control element in a processing machine comprising a dancer, the dancer position of which is registered, wherein, on the basis of the registered dancer position, the rotational speed of a roll is predefined, wherein the at least one controller parameter is determined automatically as a function of a diameter of the roll. | 10-06-2011 |
20110246128 | FILTERING METHOD FOR IMPROVING THE DATA QUALITY OF GEOMETRIC TIRE MEASUREMENTS - A tire measurement system includes a computer with various memory/media elements for storing raw and transformed tire measurement data (e.g., a data set of measured radial or lateral run-out values) as well as software in the form of computer-executable instructions, which are executed by a processor to filter selected run-out values within the obtained data set that spike above adjacent measurements, identify selected ones of the filtered run-out values that lie on a convex hull surrounding the entire set of values, and perform interpolation of the identified selected ones of the run-out values that lie on the convex hull to obtain a final data set of filtered run-out measurements. Similar steps can be performed on an inverted data set to better detect sidewall deformation features such as sidewall depressions. | 10-06-2011 |
20120095723 | METHODS AND APPARATUS FOR ACQUIRING PHYSICAL MEASUREMENTS RELATING TO A VESSEL AND A SHAFT WITHIN A VESSEL - An apparatus is used for determining at least one parameter relating to an elongate member disposed within a vessel. The apparatus includes at least one measurement unit having a light emitting component and a corresponding light receiving component. The light receiving component is positioned apart from the light emitting component such that the elongate member is positionable between the light emitting component and the light receiving component. Additionally, the light emitting component is adapted to emit light towards the light receiving component, and the light receiving component is adapted to generate a signal corresponding to the light received from the light emitting component. A method for determining at least one parameter relating to the elongate member disposed within the vessel is also provided. | 04-19-2012 |
20120095724 | OPERATING HISTORY MANAGEMENT METHOD AND OPERATING HISTORY MANAGEMENT APPARATUS - At least a rotation speed of a rotary shaft and a vibration acceleration in a frequency domain are stored as an operating history, and the operating history is stored not only when the rotation speed of the rotary shaft varies, but also when a maximum value of the vibration acceleration in the frequency domain exceeds a predetermined threshold. Therefore, variation in the rotation speed of the rotary shaft and the chatter vibration occurrence state can be stored in association with each other. Hence, an operator can learn the rotation speed of the rotary shaft and the chatter vibration occurrence state in association with each other. As a result, chatter vibration can be suppressed easily and effectively. | 04-19-2012 |
20120136622 | SENSOR SYSTEM FOR SEMICONDUCTOR MANUFACTURING APPARATUS - A chamber monitoring system may include a parallel architecture in which a single sensor control system is coupled to a number of different processing chamber control board sensor lines. In an illustrative embodiment, a single rotation sensor such as a tachometer may reside in a central control unit remote from the processing chambers such that rotation data may be processed by a single system and thereafter routed according to a variety of different network communication protocols to the main system controller, a factory interface, or both. In this and other embodiments, pull-up networks in the central control unit and the chamber control boards are matched so as to reduce electrical signal anomalies such as crowbar effects. The central control unit may be programmed via a main system controller to operate according to user defined parameters, which in turn may enable the system to differentiate between certain operating states. | 05-31-2012 |
20120203497 | DETECTING DEVICE, IMAGE FORMING APPARATUS, COMPUTER PROGRAM PRODUCT, AND DETECTING SYSTEM - A detecting device includes: a measuring unit that measures a rotating speed of at least one of connected gears; a calculating unit that calculates frequency characteristics for the rotating speed measured by the measuring unit; a detecting unit that detects a period of fluctuation of the rotating speed measured by the measuring unit; a determining unit that determines whether the connected gears include a damaged gear by using the frequency characteristics calculated by the calculating unit; and an identifying unit that, if the determining unit determines that the connected gears include a damaged gear, identifies a gear whose rotation period corresponds to the period detected by the detecting unit as the damaged gear among the connected gears. | 08-09-2012 |
20120221291 | INDOOR TESTING DEVICE FOR A PLURALITY OF ROTOR-CONTAINING FLYING OBJECTS - An indoor testing device for multiple rotor-containing flying objects including a main support having a plurality of linking members, a plurality of mechanical arms, a plurality of trays, and control units of the mechanical arms. The main support is disposed vertically. The mechanical arms are separately disposed on the linking members of the main support with different height. The trays are separately disposed on one end of the mechanical arms for receiving rotor-containing flying objects, and the control units are disposed on the mechanical arms and rotate therewith. The device can be used for the cooperation and coordination test of multiple rotor-containing flying objects and autonomous control experiments of a single rotor-containing flying object. The tests have high stimulation and improve the usability of the experimental results in the actual system. | 08-30-2012 |
20120283985 | NON-INVASIVE SPEED SENSOR - The invention relates to a method of measuring rotational speed of a shaft, comprising the steps of: coupling an optical pickup to a shaft speed sensor having an indicator light that pulses proportionally to rotational speed of a shaft being measured by the speed sensor; receiving light pulses from the indicator light of the speed sensor; and determining the rotational speed based on the rate of received light pulses. Furthermore, the invention discloses a condition monitoring equipment for a wind turbine using the above measuring method. | 11-08-2012 |
20120310589 | ROTATION SPEED DETECTING DEVICE AND DETECTING METHOD THEREOF - A rotation speed detecting device is provided. The rotation speed detecting device is electrically connected to a motor of a color wheel, and includes a phase detecting unit and a time calculating unit. The phase detecting unit is suitable for detecting a reference phase point of a rotation information outputted by the motor, and outputting a phase signal according to the reference phase point. The time calculating unit is electrically connected to the phase detecting unit, and calculates a speed information of the motor according to the phase signal. In this way, the rotation speed of the motor of the color wheel is correctly measured. | 12-06-2012 |
20120310590 | SYSTEM, METHOD, AND PROGRAM FOR DETECTING DEFLATED TIRES - A system for detecting deflated tires by making a relative comparison among rotation speeds of tires attached to a vehicle. The system includes a rotation speed information detection means for detecting rotation speed information of the tires; a rotation speed calculation means for calculating rotation speeds of the tires; and a determination means for determining deflated tires by comparing a decreased pressure determination value using the calculated rotation speeds with a predetermined threshold value. The determination means determines that the vehicle is going straight when it is found, with regard to factors composed of a lateral G, a yaw rate, and a steering angle of the vehicle, at least two of the factors including the yaw rate show that a difference between the maximum value and the minimum value at a predetermined time is lower than a predetermined value, thereby detecting deflated tires. | 12-06-2012 |
20130006575 | FAN ROTATION SPEED TEST DEVICE - A fan rotation speed test device connected to a computer includes an information processing chip, an indicating unit, and an interface. The interface is compatible with a memory socket on a mainboard of the computer. The computer transfers control instructions to the information processing chip via the interface. After receiving the control instructions, the information processing chip outputs PWM signals by executing programs therein to modulate the rotation speed of a fan. The information processing chip collects rotation speed signals of the fan, then judges if the rotation speed of the fan is according to a predetermined standard by executing arithmetic programs. The information processing chip outputs test result signals to the indicating unit for display. | 01-03-2013 |
20130054185 | METHOD AND CONTROL UNIT FOR DETERMINING A FUTURE ROTATIONAL SPEED - A method for determining a future rotational speed of a rotating drive shaft of an internal combustion engine is described, in particular while the internal combustion engine coasts after being turned off, the future rotational speed being calculated from a course of measured rotational speeds. To predict a future rotational speed of the drive shaft of the internal combustion engine as accurately as possible, instantaneous rotational speeds measured at different rotational positions of drive shaft are evaluated. | 02-28-2013 |
20130158942 | APPARATUS AND METHOD FOR DIAGNOSING FAULT OF MULTI-SENSOR OF MOTOR - Disclosed herein are an apparatus and a method for diagnosing a fault of a multi-sensor of a motor. The apparatus includes: a plurality of tachometers attached to the motor to measure rotation speeds; and a plurality of processors each connected directly to the plurality of tachometers to receive the measured rotation speeds, thereby securing a plurality of directly obtained rotation speeds, sharing the obtained rotation speeds with each other, thereby obtaining a plurality of indirectly obtained rotation speeds, and performing a fault diagnosis on the plurality of tachometers using the plurality of directly obtained rotation speeds and the plurality of indirectly obtained rotation speeds. | 06-20-2013 |
20130173210 | METHOD FOR DETERMINING AN AVERAGE ROTATIONAL SPEED OF A ROTATING TRANSMISSION SHAFT OF AN INTERNAL COMBUSTION ENGINE - A method for determining an average rotational speed of a rotating transmission shaft of an internal combustion engine to a rotational position is described, the rotating transmission shaft taking on various rotational positions and having an actual instantaneous rotational speed at a first time in the rotational position. At a first approximation in a first step, an approximated average rotational speed is determined, as the difference of the actual rotational speed at the first time and in the rotational position, and the product of a weighted amplitude and an angle-dependent amplitude factor. | 07-04-2013 |
20130197858 | METHOD FOR THE DECOUPLED CONTROL OF THE QUADRATURE AND THE RESONANCE FREQUENCY OF A MICRO-MECHANICAL ROTATION RATE SENSOR BY MEANS OF SIGMA-DELTA-MODULATION - A method for the precise measuring operating of a micro-mechanical rotation rate sensor, including at least one seismic mass, at least one drive device for driving the seismic mass in the primary mode (q | 08-01-2013 |
20130211774 | FITTING SYSTEM FOR SPORTING EQUIPMENT - Enables a fitting system for sporting equipment using an application that executes on a mobile phone for example to prompt and accept motion inputs from a given motion capture sensor to measure a user's size, range of motion, speed and then utilizes that same sensor to capture motion data from a piece of equipment, for example to further optimize the fit of, or suggest purchase of a particular piece of sporting equipment. Utilizes correlation or other data mining of motion data for size, range of motion, speed of other users to maximize the fit of a piece of equipment for the user based on other user's performance with particular equipment. For example, this enables a user of a similar size, range of motion and speed to data mine for the best performance equipment, e.g., longest drive, lowest putt scores, highest winning percentage, etc., associated with other users having similar characteristics. | 08-15-2013 |
20130231891 | Drive Systems Including Sliding Mode Observers And Methods Of Controlling The Same - At least one example embodiment discloses a method of estimating a position of a rotor in a motor. The method includes determining a first estimated position of the rotor using a first algorithm, determining a second estimated position of the rotor using a second algorithm, the second algorithm being different than the first algorithm, determining a first error based on the first estimated position and the second estimated position, and determining a third estimated position of the rotor based on the first error. | 09-05-2013 |
20130238278 | Magnetic Field Sensor for Sensing Rotation of an Object - A magnetic field sensor uses an angle sensor to measure and angle of rotation of a target object to which a magnet is attached. The angle sensor in combination with electronics can generate an angle sensor output signal related to a direction of a magnetic field of the magnet. The angle sensor output signal can be compared to thresholds to generate a magnetic field sensor output signal the same as a known true power on state (TPOS) sensor output signal. A corresponding method is also described. | 09-12-2013 |
20130262023 | METHOD FOR ESTIMATING AN OPERATIONAL PARAMETER OF A MOTOR - A method for estimating an operational parameter of a motor is to be implemented by an estimating device. In the method, the estimating device is configured to: receive an acoustic signal attributed to operation of the motor; process the acoustic signal to obtain a plurality of sample points in the frequency domain, each of which has a frequency and a corresponding amplitude; compute an estimated peak frequency using a centroid method based upon the frequencies and the amplitudes; from a plurality of peak frequencies and a plurality of known values of the operational parameter corresponding respectively to the peak frequencies, select a part of the peak frequencies approximate to the estimated peak frequency and a corresponding part of the known values of the operational parameter; and compute an estimated value of the operational parameter based upon the peak frequencies and the known values of the operational parameter. | 10-03-2013 |
20130275079 | Tachometer for Low-Speed AC Generator - A tachometer for a generator is disclosed. The tachometer may include a plurality of filters configured to receive a plurality of generator phase signals, a plurality of zero-cross detectors, and a logic circuit. The filters may be configured to convert each phase signal into a corresponding filtered signal. The zero-cross detectors may be configured to generate pulse signals responsive to zero-crossings detected in each filtered signal. The logic circuit may be in communication with each zero-cross detector and configured to receive the pulse signals. The logic circuit may logically combine the pulse signals into a combined signal, and generate a tachometer signal based on the combined signal, wherein the tachometer signal corresponds to a rotational speed of the generator. | 10-17-2013 |
20130289933 | DETECTING SHAFT ROTATION WITH SHORT OR MISSING TEETH - An apparatus configured to detect rotation of a shaft includes a sensor configured to detect a first tooth from among a plurality of teeth located circumferentially on a rotating shaft and a processor configured to determined whether the first tooth is located within a predetermined range of a missing tooth, and configured to calculate at least one of shaft position data and shaft rotation speed data having data corresponding to the first tooth omitted based on the determination that the first tooth is located within the predetermined range of the missing tooth. | 10-31-2013 |
20130289934 | ANGLE-BASED SPEED ESTIMATION OF ALTERNATING CURRENT MACHINES UTILIZING A MEDIAN FILTER - A computer-implemented method for estimating a rotor speed of an alternating current (AC) machine is provided. The method includes determining a stator flux signal based on signals of voltage and current inputs to the AC machine, and determining a rotor flux signal of the AC machine based on the determined stator flux signal. The method includes determining an electrical angle signal based on the determined rotor flux signal, and deriving an electrical frequency signal from the determined electrical angle signal. Subsequently, the method includes sampling the derived electrical frequency signal at a predetermined sampling rate, and storing a predetermined number of sample values. The method further includes evaluating a median value of the predetermined set of electrical frequency sample values, determining a slip frequency value of the AC machine, and determining the rotor speed of the AC machine by subtracting the slip frequency value from the electrical frequency median value. | 10-31-2013 |
20140046623 | Method and device for determining the inclined position of a vehicle - A method for determining the inclined position, includes using a sensor, whose measuring axis is inclined by a pitch angle with respect to the longitudinal axis of the vehicle, a rate of rotation having a roll rate component and a yaw rate component is measured. Ultimately, a roll angle for describing the inclined position of the vehicle is ascertained from the rate of rotation. | 02-13-2014 |
20140074424 | USING MAGNETOMETER DATA TO CALCULATE ANGULAR RATE MEASUREMENT BIAS - Implementations are disclosed for using magnetometer measurements to estimate bias for angular rate measurements provided by an angular rate sensor (e.g., a gyro sensor). In some implementations, a bias estimator running on a device is configured to determine if the device is rotating based on the magnetometer measurements. If the device is not rotating, a dynamic bias is calculated and added to a temperature compensated static bias to provide a total angular rate measurement bias. The total angular rate measurement bias can be provided to an attitude estimation system where it is used to update an attitude (orientation) of the device. In some implementations, the angular rate measurements are used to determine if the device is oscillating according to a threshold value. If the device is not rotating and the device is oscillating according to a threshold value, the static bias is updated in a calibration table. | 03-13-2014 |
20140081593 | MONITORING SYSTEM, MONITOR, AND METHOD FOR MONITORING A ROTATING DEVICE - A monitoring system for use in monitoring operation of a rotating device includes a first monitor including a first processor. The first monitor is configured to receive a phase reference signal from a rotation sensor, wherein the phase reference signal is indicative of a phase of rotation of the rotating device, generate a timestamp indicative of a time at which the phase reference signal was received, and generate a synchronization message including the timestamp and an indication that the phase reference signal was received. The monitoring system also includes a second monitor operatively coupled to the first monitor and comprising a second processor. The second monitor is configured to receive the synchronization message from the first monitor and synchronously sample at least one measurement based on the synchronization message. | 03-20-2014 |
20140107969 | Frequency-Modulated Micro-Gyro Half-Period Signal Processing Method - A method for measuring the input rate Ω of an FM micro-gyro. The modulation frequency F | 04-17-2014 |
20140122016 | Machine Positioning System Having Angular Rate Correction - A system and method for estimating orientation of a machine is disclosed. The method may include receiving, from a first sensor, a first angular rate of the machine measured in a body reference frame of the machine, and determining an estimated bias for a second sensor of the machine and an uncertainty measure for the estimated bias. The method may further include determining a scale factor based on the uncertainty measure and converting the first angular rate of the machine in the body reference frame to a first angular rate of the machine in a gravity reference frame by utilizing a rotation matrix including the scale factor. The method may further include estimating the orientation of the machine based on the first angular rate of the machine in the gravity reference frame. | 05-01-2014 |
20140188427 | METHOD FOR EVALUATING THE VELOCITY OF A RAILWAY VEHICLE - A method for evaluating the angular velocity of a railway vehicle circulating on a track, the vehicle including an inertial unit including at least one angular velocity sensor, the method including measuring an instantaneous angular velocity provided by the sensor, determining the bias of the angular velocity measured around at least one axis, the velocity bias being taken as equal to the value of the angular velocity measured around this axis when the measured angular velocity is substantially constant for a predetermined period, and calculating the evaluated angular velocity, by subtracting from the measured angular velocity, the previously determined velocity bias. | 07-03-2014 |
20140236532 | TRAILER LENGTH ESTIMATION - A vehicle has a wireless receiver located a predetermined distance from a trailer mount. A wireless transmitter on the trailer is located at an end of the trailer opposite the end that attaches to a trailer mount on the vehicle and communicates with the wireless receiver on the vehicle. A controller on the vehicle monitors the power returns of the signal transmitted between the transmitter and the receiver. A hitch angle monitoring system monitors hitch angle over time. The controller monitors power returns of a signal transmitted from the transmitter to the receiver and estimates a distance between the transmitter and the receiver as a function of a path loss propagation of the transmitted signal. The trailer length is equal to the distance estimated by the controller at times when the hitch angle is zero minus the predetermined distance. | 08-21-2014 |
20140350884 | WIRELESS SENSOR BASED QUANTITATIVE FALLS RISK ASSESSMENT - Methods and systems may provide for a plurality of kinematic sensors to be coupled to a corresponding plurality of shanks of an individual, a processor, and a memory to store a set of instructions. If executed by the processor, the instructions can cause the system to calculate a timed up and go (TUG) time segment based on angular velocity data from the plurality of kinematic sensors. The instructions may also cause the system to calculate a derived parameter based on the angular velocity data, and generate a falls risk assessment based on at least one of the TUG time segment and the derived parameter. | 11-27-2014 |
20140358474 | MECHANISMS FOR DERIVING AN ACCURATE TIMING SIGNAL FROM A NOISY WAVEFORM - Deriving a clean timing signal from a waveform is disclosed. A sensor-of-interest (SOI) sample set and a waveform sample set that correspond to the SOI sample set in time is collected. The waveform sample set is partitioned into a plurality of waveform sample subsets, and the SOI sample set is partitioned into a plurality of SOI sample subsets, each SOI sample subset corresponding to one of the plurality of waveform sample subsets. A plurality of waveform sample subset angular speeds is determined, wherein each waveform sample subset angular speed corresponds to a different waveform sample subset. An aggregate mean angular speed based on the plurality of waveform sample subset angular speeds is determined. Each SOI sample subset is resampled to the aggregate mean angular speed based on the corresponding waveform sample subset angular speed to generate a plurality of resampled SOI subsets. | 12-04-2014 |
20150012240 | MOTION ANALYSIS DEVICE - An inertial sensor is attached to a sporting gear held by the hand (for example, a golf club). A static state determination unit determines a static state of at least one of the sporting gear and a subject, using an output from the inertial sensor. A notification signal generation unit outputs a static state notification signal according to the static state. The static state notification signal can induce a certain physical change perceived by the subject with the five senses. In response to the physical change, the subject can start a swing movement. | 01-08-2015 |
20150025836 | ROUGH ROAD DETERMINATION DEVICE - A rough road determination device ( | 01-22-2015 |
20150149111 | DEVICE AND METHOD FOR USING TIME RATE OF CHANGE OF SENSOR DATA TO DETERMINE DEVICE ROTATION - A computer-implemented method for determining rotational rate of a computer system programmed to perform the method includes determining in a physical perturbation sensor in the computer system, a plurality of instantaneous field measurements with respect to a reference field, at a first time and a second time, determining in the computer system, a plurality of rates of change associated with the physical perturbation sensor in response to the plurality of instantaneous field measurements at the first time and the second time, determining in the computer system, an plurality of estimated rotational rates for the computer system in response to the plurality of rates of change, and performing in the computer system, an operation in response to the plurality of estimated rotational rates. | 05-28-2015 |
20150291156 | TURNING CHARACTERISTIC ESTIMATING DEVICE FOR VEHICLE - A turning-characteristic estimating unit of an ECU estimates a stability factor and a steering-response time constant coefficient that are parameter values related to turning characteristics of a vehicle. A standard yaw rate of the vehicle is calculated using the estimation values of the stability factor and the steering-response time constant coefficient estimated by the turning-characteristic estimating unit. A validity determining unit of the ECU determines the validity of the estimation values based on the standard yaw rate and an actual yaw rate of the vehicle. This allows improving the estimation accuracy of the stability factor and the steering-response time constant coefficient. | 10-15-2015 |
20150374307 | DATA ANALYSIS DEVICE, DATA ANALYSIS METHOD, AND DATA ANALYSIS PROGRAM - A data analysis device which collects sensor data in time series from a sensor attached to a user during movement in a course having a plurality of sections where two adjacent sections are connected to each other and shapes along extended directions of the sections connected to each other are different from each other, estimates times of section change points based on the sensor data, estimates a movement speed at each section, based on times of each of the plurality of the section change points and a distance value of each section, calculates differences between movement speeds at two sections connected to each other, and adjusts the movement speeds to appropriate values by adjusting at least one of the plurality of section change points so as to reduce a value of sum total of the differences. | 12-31-2015 |
20160033645 | TARGET ROTATION DETERMINATION BY DIFFERENTIAL DOPPLER EVALUATION - Systems and corresponding methods for use in measuring rotation characteristics (e.g., rotation magnitude and direction) of remote targets are provided. A laser light of a known frequency is incident upon the target and reflected. A portion of the reflected laser light is directed to detector field of view, where it is measured and analyzed. The detector field of view is divided into multiple segments, each capable of independently measuring the intensity and frequency of laser light incident thereon. The rotation magnitude of the target may be correlated with the width of the total Doppler spread of reflected light incident upon the detector. The rotation direction of the target may be correlated to a difference in the Doppler spreads measured for corresponding halves of the detector. | 02-04-2016 |
20160033646 | TARGET ROTATION DETERMINATION BY SPECKLE MOTION CHARACTERIZATION - Systems and corresponding methods for use in measuring rotation characteristics (e.g., rotation magnitude and direction) of remote targets are provided. A laser light of a known frequency is incident upon the target and reflected. A portion of the reflected laser light is directed to detector field of view, where it is measured and analyzed. The detector field of view is divided into multiple segments, each capable of independently measuring the intensity of laser light incident thereon as a function of time. The linear rotation of the target may be determined from cross-correlation of the light intensity-time response measured at orthogonal pairs of detector halves arranged from combinations of the detector segments. The angular rotation of the target is further determined from this linear rotation. | 02-04-2016 |
20160061854 | METHOD AND DEVICE FOR CALCULATING VELOCITY - A velocity calculating device is provided, which can accurately calculate a moving velocity of a movable body without depending on signals obtained externally. A navigation device includes an acceleration acquiring module, an angular velocity acquiring module, a time difference detecting module, and a velocity calculating module. The acceleration acquiring module acquires the vertical acceleration of one of the axle of the front wheels and the axle of the rear wheels. The angular velocity acquiring module acquires a pitch angular velocity of the automobile. The time difference detecting module detects a time difference between the acceleration in the vertical directions and the pitch angular velocity. The velocity calculating module calculates a moving velocity of the automobile based on a rate of a wheelbase with respect to the time difference. | 03-03-2016 |
702146000 | Averaging performed | 3 |
20080221827 | SYSTEM FOR VALIDATING VELOCITIES OF COMPONENTS IN A VEHICLE - A system for validating velocities of components in a vehicle uses sensor measurements and mathematical relationships between the vehicle components to validate the velocities. A controller or controllers receive speed or velocity inputs and mathematically combine the velocities of more than one of the vehicle components. The velocities of at least one of the vehicle components is validated when the mathematical combination meets at least one predetermined criterion. The validated velocity or velocities are then communicated to at least one of the vehicle components. | 09-11-2008 |
20120191406 | ANGULAR SPEED DETECTION APPARATUS AND METHOD FOR DETECTING ANGULAR SPEED ERROR - In an angular speed detection apparatus according to the present embodiment, in a positive counter, a first counter value P is obtained by adding 3 when an average angular speed | 07-26-2012 |
20150362518 | Integer Ratiometric Analysis of Rotating Assets - A computer-executable ratiometric analysis method determines integer components of a rational number ratio or a close approximation of an irrational number ratio. In one embodiment the method uses a ratio of rotational speeds of two rotating assets in a machine or process, generates a new rational number based on the ratio of speeds, and calculates the integer components of the new rational number. The result is the integer ratio relationship between the initial two rational numbers. The method may be used in machinery analysis applications to determine whether a low-order integer ratio relationship exists between two machinery rotating components. Low-order integer ratio relationships in machinery are generally harmful in related machinery rotating components, and detection of such relationships is an important tool in preventing damage to machinery components. In a more general embodiment the algorithm can be used to determine the closest integer roots of any fractional number where this information would be of interest to an analyst in understanding the fractional number. | 12-17-2015 |
702147000 | Specific mathematical operation performed | 29 |
20080228431 | Method and control device for estimating a rotational speed curve of a shaft of a transmission - In a method for estimating a rotational speed curve of a shaft of a transmission of a motor vehicle after a synchronizing element which acts on the shaft has been deactivated the subsequent speed of the shaft, that is the curve of the rotational speed is estimated on the basis of the rotational speed of the shaft at the deactivation time and the rotational speed gradient at the deactivation time, taking into account a characteristic value (F) which is dependent on an activation period needed for the synchronizing element to accelerate the during activation of the synchronizing element, thereby providing for a particularly precise estimation of the rotational speed curve of the shaft. | 09-18-2008 |
20080255796 | Method and device for measuring rotation speed of rotating equipment - The rotation speed measuring device includes a position sensor ( | 10-16-2008 |
20080300820 | METHOD AND SYSTEM FOR ESTIMATING ROTOR ANGULAR POSITION AND ROTOR ANGULAR VELOCITY AT LOW SPEEDS OR STANDSTILL - A method and system for estimating an angular position and an angular velocity of a rotor in a dynamoelectric machine measures an AC current and a potential for each of a plurality of windings coupled to a stator of the dynamoelectric machine, transforms the measured currents and potentials to a stationary frame to produce transformed currents and transformed potentials, and processes the transformed currents and transformed potentials to produce a first intermediate signal and a second intermediate signal. The first intermediate signal and the second intermediate signal are cross-coupled to produce a third intermediate signal and a fourth intermediate signal. The third intermediate signal and the fourth intermediate signal are processed to obtain a first extended rotor flux value and a second extended rotor flux value. The first extended rotor flux value and the second extended rotor flux value are applied to a phase lock loop to derive an estimated rotor angular position and an estimated rotor angular velocity for the dynamoelectric machine. | 12-04-2008 |
20090030645 | SYSTEM FOR ESTIMATION OF POSITION AND SPEED IN A PERMANENT MAGNET ROTOR OF AN ELECTRICAL MOTOR - Procedure for estimating the electrical drive speed and position of a permanent magnet rotor of a brushless electrical linear or rotating motor, especially for a drive control circuit, using multi-phase current measurements on the motor, whose measurement values, depending on the estimated position, are transformed into a rotor-related d,q reference frame i.e. into a direct current vector component and a quadrature current vector component, and the direct and quadrature vector components of current and a voltage, together with the estimated speed, are fed as input variables to a mathematical motor model, and the motor model generates a first output variable and a second output variable, whereby the first output variable in the d,q reference frame corresponds to the d or direct vector component as well as to a position estimation error, and the second output variable in the d,q reference frame corresponds to the q or quadrature component as well as to a speed estimation error, and the two output variables are fed to a tracking controller for estimating and outputting the position and/or speed, whereby from the motor model a third output variable is computed, by
| 01-29-2009 |
20090240465 | METHOD FOR DETERMINING A CRITICAL REDUCTION IN SHAFT SPEED IN A WORK MACHINE - A method for determining a critical reduction in shaft speed in a work machine having at least one monitored shaft driven by a crankshaft of an engine includes determining an actual rotational speed of the crankshaft; determining an actual rotational speed of a first monitored shaft; determining a filtered rotational speed of the first monitored shaft based on an algorithm that utilizes the actual rotational speed of the first monitored shaft, the actual rotational speed of the crankshaft, and a reference rotational speed of the crankshaft; comparing the filtered rotational speed to the actual rotational speed of the first monitored shaft; determining whether the actual rotational speed of the first monitored shaft deviates from the filtered rotational speed by a predetermined amount; and activating an alarm if the actual rotational speed of the first monitored shaft deviates from the filtered rotational speed by the predetermined amount. | 09-24-2009 |
20100057396 | Method For Analyzing Output From A Rotary Sensor - A method for analyzing the output of a rotary sensor, such as that coupled to a vehicle wheel assembly. In one embodiment, the method detects periodic irregularities in the output of an incremental rotary sensor and uses those irregularities with a reference signal and a pattern comparison technique to determine the absolute angular position of the sensor. | 03-04-2010 |
20100106451 | Zero-Point Correction Apparatus and Method for an Angular Speed Sensor - An angular sensor ( | 04-29-2010 |
20100131232 | BELT SLIP METER - A meter for measuring belt slip in a belt drive system having at least a belt trained about two rotating elements. The meter comprises: two sensor inputs, to receive a digital signal related to the speed of a said rotating element; an external input, to accept a command or value; an output, to display or transmit a measurement or calculation result; and a controller, to calculate the relative speed of the two rotating elements, compare the relative speed to a set-point, and output a result indicative of belt slip. | 05-27-2010 |
20100299100 | METHODS AND SYSTEMS INVOLVING DETERMINING SHAFT VELOCITY - A method of determining velocity of a shaft is provided. The method includes receiving a first shaft position signal and a second shaft position signal. Derivatives of each of the first shaft position signal and the second shaft position signal are computed, as are squares of each of the derivatives, a summation of the squares, and a square root of the summation. The velocity is output as a result of the square root. | 11-25-2010 |
20100305898 | APPARATUS AND METHOD FOR MEASURING DYNAMIC RIGIDITY OF A MAIN SHAFT OF A MACHINE TOOL - An apparatus for measuring dynamic rigidity of a main shaft of a machine tool with high accuracy. The apparatus includes an unbalanced master that is attached to the main shaft and of which position of a center of gravity is offset with respect to a center of rotation of the main shaft; a tachometer that measures a rotational speed of the main shaft; and a run-out amount measuring device that is positioned so as to face the unbalanced master at a predetermined position in an axial direction and is any given position in a circumferential direction, and that measures an amount of run-out of the unbalanced master. The dynamic rigidity of the main shaft is calculated based on a relation between the rotational speed measured by the tachometer and the amount of run-out measured by the run-out amount measuring device. | 12-02-2010 |
20110054832 | METHOD AND DEVICE FOR THE ROBUST AND EFFICIENT DETERMINATION OF THE ROTATIONAL DIRECTION AND/OR ROTATIONAL SPEED OF A WHEEL OR A SHAFT - A method and a device are described for determining the rotational direction and/or rotational speed of a rotatable body on the basis of a sine signal and cosine signal, which is assignable to the rotational direction and/or rotational speed of the rotatable body and are output by a sensor, having at least one of the following steps: recording a sine signal and cosine signal, which is assignable to the rotational direction and/or rotational speed, at a point in time; determining a phase value from the sine signal and cosine signal; recording sine signals and cosine signals, which is assignable to the rotational direction and/or rotational speed, at points in time; determining phase values from the corresponding sine signals and cosine signals; calculating phase differences from the phase values and the phase value; and determining the rotational direction and/or rotational speed from the phase differences on the basis of a Vernier method. | 03-03-2011 |
20110125456 | SIGNAL PROCESSING CIRCUIT FOR ROTATION DETECTOR - A signal processing circuit for a rotation detector includes a normal-rotation pulse request holding portion, a reverse-rotation pulse request holding portion, a resetting portion, and a waiting time switching portion. When an output of one of a normal-rotation pulse and a reverse-rotation pulse is finished and a waiting time elapses, the resetting portion resets an output request signal of the one of the normal-rotation pulse and the reverse-rotation pulse held by one of the pulse request holding portions. The waiting time switching portion sets the waiting time to a first waiting time when one of the pulse request holding portions holds the output request signal, and the waiting time switching portion sets the waiting time to a second waiting time longer than the first waiting time when both the pulse request holding portions hold the output request signals. | 05-26-2011 |
20110231146 | SYSTEM AND METHOD FOR ESTIMATING TORQUE AND ROTATIONAL SPEED OF MOTOR - A system and a method for estimating a torque and a rotational speed of a motor are disclosed. The system includes a sound receiving device, a feature extraction device, and an artificial neural network module. In the method, at first, a plurality of training data are provided, wherein the training data includes a plurality of history sound feature values of the motor and history torque values or history rotation values corresponding thereto. Thereafter, an artificial neural network stored in the artificial neural network module is trained by the history data to obtain a motor model of the motor. Then, a motor sound signal made by the motor in a working state is received. Thereafter, sound feature values of the motor sound signal are extracted. Thereafter, the rotational speed value and the torque value are computed by the motor model in accordance with the at least one sound feature value. | 09-22-2011 |
20110313717 | SYSTEM AND METHOD OF SPEED DETECTION IN AN AC INDUCTION MACHINE - A system and method for determining rotor speed of an AC induction machine is disclosed. The system is programmed to estimate a rotor speed of the induction machine according to a linear speed estimation algorithm and based on name plate information (NPI) of the induction machine and parameters of the AC induction machine during operation thereof. The rotor speed estimation system is also programmed to estimate a rotor speed of the AC induction machine according to a frequency-domain signal processing algorithm and determine if the rotor speed estimated thereby is valid. If the rotor speed estimated by the frequency-domain signal processing algorithm is valid, then a tuned rotor speed of the AC induction machine is estimated according to the linear speed estimation algorithm and based, in part, on the rotor speed estimated by the frequency-domain signal processing algorithm. | 12-22-2011 |
20130073251 | MONITORING METHOD AND MONITOR APPARATUS FOR MONITORING ROTATION SPEED OF ROTARY SHAFT IN MACHINE TOOL, AND MACHINE TOOL - When a rotation speed is fluctuated, a fluctuation diagram showing the relationship between a fluctuation amplitude and a fluctuation period of the rotation speed is displayed on a monitor. In addition to a current setting value, a settable range of the fluctuation amplitude and the fluctuation period is displayed on the fluctuation diagram. At least one of an optimal fluctuation period P | 03-21-2013 |
20140372071 | Automatic Threshold Detection for Tachometer Signals - A method is described for automatically determining a proper threshold for a tachometer signal in order to produce desired tachometer pulses necessary for analysis of machine vibration data. A tachometer signal is low-pass filtered to exclude high frequency noise and a running derivative of the filtered tachometer waveform is taken to create a derivative waveform. Another waveform is created that includes only positive values from the derivative waveform that correspond to positive values in the low-pass filtered tachometer waveform. In general, a tachometer signal has the greatest derivative value (slope) when a tachometer pulse is present. Based on this observation, a threshold value is determined using both the low-pass filtered tachometer waveform and the positive-value derivative waveform along with statistics from both waveforms. | 12-18-2014 |
20150012241 | ADAPTIVE AUTOMATIC GAIN CONTROL APPARATUS AND METHOD FOR INERTIAL SENSOR - Disclosed herein are an adaptive automatic gain control apparatus and method for an inertial sensor. The adaptive automatic gain control apparatus for an inertial sensor, includes: a displacement measuring unit measuring and outputting a driving displacement of the inertial sensor; and a controlling unit driving the inertial sensor using an initial driving signal and then resetting a driving signal while changing a margin value using the driving displacement measured by the displacement measuring unit, thereby driving the inertial sensor. | 01-08-2015 |
20150025837 | MOTOR POSITION FILTER FOR ESTIMATION OF VELOCITY USING MOVING LINEAR REGRESSION - A method of estimating a motor velocity in an electric power steering system that includes a motor is provided. The method generates motor position data by sampling an original motor position signal at an irregular sampling rate. The method estimates a motor velocity by performing a regression analysis on the motor position data. | 01-22-2015 |
20150073745 | ANGLE DETECTION DEVICE AND ANGLE DETECTION METHOD - An angle detection device includes: first and second rotation measuring instruments; an anomaly detection unit detecting occurrences of anomalies in the first and second rotation measuring instruments; and a switching interpolation unit configured to select a first angle signal and a first angular speed signal and output as a third angle signal and a third angular speed signal when the first rotation measuring instrument is normal, and to perform switching so that a second angle signal and a second angular speed signal are output as the third angle signal and the third angular speed signal while performing interpolation so that the difference between the first angle signal and the second angle signal is reduced stepwise if the second rotation measuring instrument is normal when an anomaly has occurred in the first rotation measuring instrument. | 03-12-2015 |
20150316446 | ENGINE RPM SIGNAL PROCESSING METHOD FOR CLUTCH CONTROL IN VEHICLE - An engine rpm signal processing method in a vehicle, may include a low speed determination step for determining whether an engine rpm sensor signal needs to be subjected to post processing when the engine rpm sensor signal is less than a predetermined first reference speed, and a filtering step for processing the engine rpm sensor signal with a Kalman filter to output a filtered engine rpm when it is determined in the low speed determination step that the post processing of the engine rpm sensor signal is necessary. | 11-05-2015 |
20160047840 | OFFSET ESTIMATION APPARATUS, OFFSET ESTIMATION METHOD, AND COMPUTER READABLE MEDIUM - To accurately measure the offset of an angular velocity sensor mounted in a mobile device in a short time, provided is an offset estimation apparatus including an acquiring section that acquires an output signal from an angular velocity sensor mounted in a mobile device; a hold state judging section that judges a hold state of the mobile device; and an offset estimating section that estimates an offset of the output signal of the angular velocity sensor according to a judgment result of the hold state judging section. Also provided is a method and program. The offset estimation apparatus may include a parameter control section that controls an estimation parameter of the offset estimating section according to the judgment result of the hold state judging section. | 02-18-2016 |
20160077121 | APPARATUS AND METHOD FOR MEASURING SPEED OF MDPS DRIVE MOTOR - A method for measuring speed of an MDPS drive motor may include: receiving, by a controller, A and B pulses having a phase difference of 90 degrees from an encoder during a first reference time, and measuring information of the pulses; receiving A and B pulses having a phase difference of 90 degrees from the encoder again during the first reference time, and remeasuring information of the pulses; selecting any one of the measured pulse information and the remeasured pulse information as data for calculating the speed of the motor, based on the measured pulse information and the remeasured pulse information; and calculating the speed of the motor, based on the selected data. | 03-17-2016 |
702148000 | For wheel speed | 7 |
20090012740 | Method for determining the wheel position in a vehicle - In a method for determining the wheel position in a vehicle, phase-shifted sensor signals of one wheel are evaluated, the position of the wheel on the left or right side of the vehicle being ascertained based on the algebraic sign of the phase shift. | 01-08-2009 |
20090063089 | Method and System For Detecting the type of tire - A method and a system for detecting the type of tire are disclosed, in particular in an indirectly measuring tire pressure monitoring system, which detects tire inflation pressure loss from the wheel rotational behavior. At least one modified vehicle tire is used, which incites specific patterns related to tire properties in the wheel rotational speed signal, and information about the tire is acquired by evaluation of the wheel rotational speed information. | 03-05-2009 |
20090093993 | SYSTEM AND METHOD FOR DETECTION OF STOPPED VEHICLE - A system, method and computer program product is provided for detecting if a vehicle is stopped. A wheel speed, transmission output speed, and a vehicle state, representative of a plurality of vehicle dynamic parameters, is determined. The vehicle is determined to be stopped if, after a predetermined period of time, the wheel speed and transmission output speed remain zero and the vehicle state remains stable. | 04-09-2009 |
20100169040 | METHOD FOR ESTIMATING THE LONGITUDINAL SPEED OF A MOTOR VEHICLE - A method for estimating longitudinal speed of a motor vehicle, including two drive wheels and at least one central electronic unit, based on rotational speeds of the four wheels two of which are drive wheels, such that, after arranging the rotational speeds in descending order: in an acceleration phase, the vehicle longitudinal speed is compared with the speed of the third fastest wheel, and its acceleration should not exceed that of the slowest wheel; in a deceleration phase, the longitudinal speed is compared with the speed of the fastest wheel and its acceleration in absolute value should not exceed that of the second fastest wheel; when the longitudinal speed ranges between the speed of the third fastest wheel and that of the fastest wheel, its value remains constant. | 07-01-2010 |
20100223025 | METHOD AND DEVICE FOR BALANCING PRODUCTION-RELATED INACCURACIES OF THE MAGNETIC WHEEL OF AN ELECTROMOTIVE DRIVE OF A VEHICLE - In a method and a device for balancing production related inaccuracies of the magnetic wheel of an electromotive drive of a vehicle, correction factors are used, the initial value of which is factory preset, and which are modified in the course of an adaption process until the production-related inaccuracies of the magnetic wheel have been balanced as much as possible. | 09-02-2010 |
20120226469 | WHEEL SPEED ESTIMATION USING A DRIVETRAIN MODEL - A controller. The controller includes a processor and a non-transitory computer readable medium. The processor is configured to receive the speed of a first driven wheel from a wheel speed sensor and the speed of a drive shaft from a drive shaft sensor. The non-transistory computer readable medium includes program instructions executed by the processor for determining a speed of a second driven wheel based on a plurality of detected speeds of the first driven wheel and detected speeds of the drive shaft over time. | 09-06-2012 |
20190143767 | METHOD FOR DETERMINING A WHEEL TIRE GROUND PRINT | 05-16-2019 |