Patent application number | Description | Published |
20090048735 | METHOD AND DEVICE FOR CONTROLLING TURNING ANGLE OF A MOTOR VEHICLE REAR WHEEL - A device including a mechanism that executes a control law and a mechanism responsive to a rear wheel turning angle instruction derived from the control law for making the angle dependent on the instruction. Further, a mechanism monitors signals representing input variables of the control law, designed to indicate an error in the current value of one of the variables and in replacing the current value with a previous certain value of the variable. In a case of a persistent error, the control law is replaced by a mode involving secure computing of the rear wheel turning angle. | 02-19-2009 |
20090194359 | DEVICE FOR ORIENTATING REAR WHEELS - A device for orientating rear wheels of a vehicle, including: a rear axle fitted with two orientable wheels; an actuator including: a body with a lubricated guide bearing and an actuating member that can move relative to the body, guided by the bearing, and the movements of which orientate the wheels about the vertical of the rear axle; a temperature sensor; and a control circuit for the actuator, configured to lock movements of the actuating member when the temperature determined by the temperature sensor is below a predetermined threshold value. | 08-06-2009 |
20090326762 | DEVICE AND METHOD FOR MONITORING THE TURN COMMAND TO A STEERED REAR WHEEL - A device and method for monitoring a turn command to a steered rear wheel of a vehicle with at least three steered wheels, in which a steering angle datum value for the steered rear wheel is compared against a template, the comparison being made by a computer that generates the datum value. | 12-31-2009 |
20100161181 | METHOD AND DEVICE FOR MANAGING A TURNING SETPOINT APPLIED TO AT LEAST ONE TURNING ACTUATOR FOR THE REAR WHEELS OF AN AUTOMOBILE - A method for managing a turning setpoint applied to at least one turning actuator for rear wheels of an automobile including four steering wheels, the turning setpoint being generated by a turning control unit upon a braking situation with asymmetrical adhesion. The method calculates an intermediate turning setpoint of the rear wheels for compensating a yaw torque generated by a braking with asymmetrical adhesion of the four wheels, transmits an intermediate turning setpoint to the at least one turning actuator for the rear wheels, monitors the value of the intermediate turning setpoint using an acceptation module, and transmits to a braking control unit information generated by the acceptation module of the intermediate turning setpoint. | 06-24-2010 |
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 |
20130054105 | METHOD OF MANAGING A DEVICE FOR DISTRIBUTING ENGINE TORQUE UPON A FAILURE OF ITS SELECTION BUTTON - A method managing a device distributing engine torque between main and secondary wheel sets of a motor vehicle, the distributing device including an actuator distributing engine torque, a control unit exhibiting plural distribution modes of the engine torque and adopting one distribution mode as a function of a variable and a button selecting a distribution mode delivering an information item representative of the button position, the control unit determining, in regular operation, the variable, as a function of the information item; the method includes: detecting potential failure of the selection button, including verifying consistency of the information item; activation of degraded mode of operation, when a failure of the button is detected, in which a constant value is allocated to the variable; during degraded operation, monitoring end of failure, including verifying consistency of the information item; activation of regular mode of operation, when end of failure is detected. | 02-28-2013 |
20130066583 | ESTIMATION OF THE TEMPERATURE OUTSIDE A VEHICLE FROM TEMPERATURE MEASUREMENTS UNDER THE BONNET OF A VEHICLE - A method for determining an estimated value of air temperature outside a vehicle driven by an internal combustion engine, according to which an initial estimated value is attributed to an estimated temperature, the temperature of an intake air of the engine is then measured, and a speed of the vehicle is assessed, followed by a mathematical filtering of the measured temperature of the intake air of the engine. The filtering operation imposes a maximum gradient on the estimated temperature, that has at least two separate positive values over time, either one of the maximum positive gradient values being selected according to the momentary speed of the vehicle. | 03-14-2013 |
20130073158 | METHOD FOR CONTROLLING THE OPERATION OF A MEANS OF MECHANICALLY COUPLING THE FIRST AND SECOND AXLES OF A MOTOR VEHICLE - A method controlling operation of a mechanism mechanically coupling first and second axles of a transmission system of a motor vehicle, the first axle being driven as standard and the second axle being driven as an option depending on a status of the coupling mechanism, the transmission system being capable of operating in a first mode in which a value of transmittable torque that can be transmitted by the mechanical coupling mechanism is fixed, or in a second mode in which the value of the transmittable torque that can be transmitted by the mechanical coupling mechanism is higher than the value of the transmittable torque for the first mode. | 03-21-2013 |
20130073159 | SYSTEM FOR CONTROLLING A TORQUE TRANSFER ACTUATOR WITH MULTIPLE MODES OF OPERATION - A system for controlling a torque transfer actuator for a four-wheel drive motor vehicle, including: a determining mechanism and a system for preventing the wheels from locking; a controller preventing the wheels from locking; and a controller for the torque transfer actuator, configured to interact to transmit a torque transfer command destined for the torque transfer actuator. | 03-21-2013 |
20130073167 | TORQUE DISTRIBUTION CONTROL METHOD FOR A FOUR-WHEEL DRIVE MOTOR VEHICLE AND CORRESPONDING VEHICLE - A motor vehicle with four drive wheels mounted on first and second axles, including: a transfer shaft connected to the first axle and a controlled coupling that can transfer part of the torque from the transfer shaft to the second axle; a mechanism determining respective speeds of the first and second axles, and a torque distribution control system configured to determine a slip value representative of the speed difference between the first and second axles and to control the coupling. The torque distribution control system is further configured to control the coupling such as to suppress any torque transfer via the coupling when the average slip value over a pre-determined period exceeds a threshold. | 03-21-2013 |
20130096794 | METHOD OF MANAGING A DEVICE THAT SPLITS DRIVE TORQUE BETWEEN THE FRONT AND REAR WHEELSET OF A VEHICLE - A splitting of drive torque between front and rear wheelsets includes an actuator to split the torque between the wheelsets, an electronic unit controlling switching of the actuator into a coupled or uncoupled mode, a mechanism electrically powering the electronic unit, and sensors. The electronic unit can make the system adopt: an active operation in which a control signal is generated and the temperature of the actuator is estimated; and a sleep mode in which the temperature of the actuator is not estimated; the switch to sleep mode being authorized: only when the engine is stopped, and if the actuator temperature is below or equal to a threshold or a maximum time period has elapsed. | 04-18-2013 |
20130110312 | METHOD FOR ESTIMATING THE INITIAL TEMPERATURE OF A MECHANICAL MEMBER OF A VEHICLE AT THE START-UP OF THE VEHICLE | 05-02-2013 |