Class / Patent application number | Description | Number of patent applications / Date published |
123674000 | With modifying or updating memory (i.e., learning) | 22 |
20080264398 | Auxiliary Power Compensation During Map Testing - A method for updating a map in a vehicle having an internal combustion engine and an auxiliary power source is provided. The method includes changing an input parameter; monitoring an actual output value corresponding to the changed input parameter; mapping the monitored actual output value to the changed input parameter; and compensating engine output with the auxiliary power source to account for changes to engine output resulting from changing the input parameter. | 10-30-2008 |
20090064976 | LEARN CORRECTION FEATURE FOR VIRTUAL FLEX FUEL SENSOR - A system for estimating fuel concentration comprises an ethanol estimating module that generates an ethanol estimate based on baseline closed loop corrections (CLC). A fuel system module controls fuel to an engine and generates a fuel system error. The ethanol estimating module selectively adjusts the baseline CLC and the ethanol estimate based on the fuel system error. A method for estimating fuel concentration comprises generating an ethanol estimate based on baseline closed loop corrections (CLC); controlling fuel to an engine and generating a fuel system error; and selectively adjusting said baseline CLC and said ethanol estimate based on said fuel system error. | 03-12-2009 |
20090064977 | METHOD TO DETERMINE AN ALCOHOL CONTENT - The invention relates to a method to determine an alcohol content in the fuel of an internal combustion engine, in which the fuel is delivered to the individual cylinders of the internal combustion engine by way of a fuel supply via a fuel rail; and the exhaust gas of the internal combustion engine is discharged via an exhaust gas manifold of an exhaust gas system, wherein at least one exhaust gas probe is present, and in which current changes in the alcohol content of the fuel are evaluated from the signal flow of a lambda signal of the exhaust gas probe, and said signal results from a closed-loop lambda control. | 03-12-2009 |
20090301451 | CONTROL APPARATUS AND METHOD FOR VEHICLE HAVING INTERNAL COMBUSTION ENGINE AND CONTINUOUSLY VARIABLE TRANSMISSION, AND CONTROL APPARATUS AND METHOD FOR INTERNAL COMBUSTION ENGINE - A control apparatus is provided for a vehicle including an internal combustion engine and a continuously variable transmission capable of controlling an output speed of the engine. A controller of the control apparatus determines a first operating point at which a total fuel consumption amount is minimized as an optimal operating point, such that the total fuel consumption amount is obtained by adding an amount of a fuel consumed by an exhaust purifying device disposed in an exhaust system to an amount of a fuel consumed by the engine for generating a required output. The controller then controls an engine load and also controls a speed ratio of the transmission so that the engine operates at the optimal operating point. | 12-10-2009 |
20090314267 | CONTROLLER OF INTERNAL COMBUSTION ENGINE - A control apparatus for an internal combustion engine that can prevent, for instance, an exhaust purification catalyst from being damaged when the employed fuel is changed to a fuel having different properties during an operation. If fuel learning is incomplete while a refueling record exists, the throttle opening of an internal combustion engine operable on a fuel that is obtained by mixing alcohol and gasoline at an arbitrary ratio is limited. Limiting the throttle opening makes it possible to avoid an entry into an operation region where fuel increase is performed. This prevents air-fuel ratio feedback control from being stopped when a fuel change occurs. Consequently, the use of an improper air-fuel ratio that may damage the catalyst can be definitely avoided. | 12-24-2009 |
20100024790 | AIR-FUEL RATIO CONTROL SYSTEM OF A MULTI-CYLINDER INTERNAL COMBUSTION ENGINE - An air-fuel ratio control system of a multi-cylinder internal combustion engine provided with a throttle valve and opening characteristic control means, which system performs feedback control of an air-fuel ratio based on an output of a sensor detecting an air-fuel ratio of exhaust gas and is capable of performing more accurate air-fuel ratio control, is provided. In the feedback control, the relationship of the output of the sensor and a feedback value is corrected based on a feedback learning correction value learned and determined based on the output of the sensor during the feedback control, and, when newly learning the feedback learning correction value, the intake air amount is controlled by only the throttle valve. | 02-04-2010 |
20100101548 | FUEL INJECTION CONTROL DEVICE AND METHOD FOR MULTI-FUEL ENGINE - A fuel injection control device for a multi-fuel engine includes a corrector and a reviewer. An alcohol concentration learning unit is provided to learn an alcohol concentration in an injected fuel based on an oxygen concentration detected in an exhaust gas. A fuel injection amount controller is provided to control a fuel injection amount based on a learning value corresponding to the oxygen concentration. The corrector is configured to reduce the fuel injection amount corresponding to the learning value for a predetermined time period when the learning value is higher than a threshold value when an engine is started. The reviewer is configured to review the learning value to provide a revised learning value based on the oxygen concentration while the corrector reduces the fuel injection amount. The fuel injection amount is controlled based on the revised learning value after the corrector reduces the fuel injection amount. | 04-29-2010 |
20100108045 | ENGINE CONTROLLER - An electronic control unit | 05-06-2010 |
20100108046 | AIR-FUEL RATIO CONTROL DEVICE AND AIR-FUEL RATIO CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE - An air-fuel ratio control device includes an air-fuel ratio sensor provided upstream from a three-way catalyst, and an oxygen sensor provided downstream from the three-way catalyst. The air-fuel ratio control device controls the fuel supply amount based on the output from the air-fuel ratio sensor, and compensates for errors in the air-fuel ratio sensor by correcting the fuel supply amount based on the output from the oxygen sensor. The fuel supply correction amount is calculated based on an integral term that integrates the deviation between the output from the downstream air-fuel ratio sensor and the target air-fuel ratio. When a fuel supply adjustment control is executed, the value of the integral term in the sub-feedback control is not updated for a predetermined period after the fuel supply adjustment control ends. The actual air-fuel ratio is thus brought to the target air-fuel ratio in an appropriate manner. | 05-06-2010 |
20100163008 | ABNORMALITY DETECTION DEVICE FOR INTERNAL COMBUSTION ENGINE AND AIR/FUEL RATIO CONTROL APPARATUS FOR INTERNAL COMBUSTION ENGINE - An abnormality detection device for an internal combustion engine capable of performing abnormality detection with accuracy, and an air/fuel ratio control apparatus for an internal combustion engine capable of performing air/fuel ratio control with accuracy. An estimated value of the amount of intake air at a valve closing time at which an intake value is closed, is computed. The in-cylinder air/fuel ratio in a cylinder is computed by using the estimated value. The obtained in-cylinder air/fuel ratio is used as an input air/fuel ratio to identify a parameter in a primary delay element. Determination as to the existence/nonexistence of an abnormality in a pre-catalyst sensor (A/F sensor) is made on the basis of the obtained parameter. | 07-01-2010 |
20100180874 | AIR-FUEL RATIO CONTROL APPARATUS AND AIR-FUEL RATIO CONTROL METHOD - An air-fuel ratio control apparatus includes a learning unit learning amounts of divergence of a correction amount from a reference value thereof respectively as to a plurality of set lift amount regions as divergence amount learning values, a correction unit calculating a divergence amount correction value and correcting a fuel injection amount command value, and a reflection unit reflecting a learning result of the divergence amount learning value of a specific one of the plurality of the set lift amount regions on the divergence amount learning value of another one of the lift amount regions when there is a history indicating that the divergence amount learning value of the specific one of the lift amount regions has been learned and there is no history indicating that the divergence amount learning value of that another one of the lift amount regions has been learned. | 07-22-2010 |
20100192929 | ABNORMALITY DIAGNOSIS APPARATUS FOR SECONDARY AIR SUPPLY ASSEMBLY OF INTERNAL COMBUSTION ENGINE - An abnormality diagnosis apparatus for diagnosing abnormality of a secondary air supply assembly includes an abnormality diagnosing unit, an air-fuel ratio learning/correcting unit, a learning degree computing unit, and a prohibition unit. The abnormality diagnosing unit diagnoses abnormality of the secondary air supply assembly based on an output of the air-fuel ratio detecting unit. The air-fuel ratio learning/correcting unit learns variation of an air-fuel ratio control system of the engine and corrects variation of an air-fuel ratio based on a result of learning the variation of the air-fuel ratio control system. The learning degree computing unit computes a learning degree, by which the air-fuel ratio learning/correcting unit learns the variation of the air-fuel ratio control system. The prohibition unit prohibits the abnormality diagnosis or makes a diagnostic result invalid when the learning degree is equal to or less than a predetermined value. | 08-05-2010 |
20100224175 | FUEL INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINE - The device including: a fuel correction value calculating unit for calculating a correction value for a fuel injection quantity so that an actual air-fuel ratio becomes equal to a target air-fuel ratio; a fuel switching detecting unit for detecting that fuel switching has occurred; a fuel property estimating unit for setting a period, in which there is a possibility that a fuel property changes, as a property change period when the fuel switching is detected to calculate a fuel property correction value corresponding to another correction value for the fuel injection quantity based on the correction value within the property change period; and a property change judging unit for judging whether or not a change in the correction value is due to the change in the fuel property in a case where the correction value becomes out of a predetermined range even though the property change period is not set. | 09-09-2010 |
20120006307 | AIR-FUEL RATIO CONTROL APPARATUS OF A MULTI-CYLINDER INTERNAL COMBUSTION ENGINE - An air-fuel ratio control apparatus includes a catalytic converter disposed at a position downstream of an exhaust gas aggregated portion; a downstream air-fuel ratio sensor disposed in an exhaust passage at a position downstream of the catalytic converter; first feedback amount updating means for updating a first feedback amount to have an output value of the downstream air-fuel ratio sensor coincide with a target downstream-side air-fuel ratio based on the output value of the downstream air-fuel ratio sensor; and a learning means for updating a leaning value of the first feedback amount in such a manner that the leaning value brings in a steady-state component of the first feedback amount based on the first feedback amount. | 01-12-2012 |
20120055457 | METHOD AND APPARATUS FOR ADAPTIVE FEEDBACK CONTROL OF AN EXCESS AIR RATIO IN A COMPRESSION IGNITION NATURAL GAS ENGINE - A computer-implemented method is used to correct deviations between a predicted gas excess air ratio and a calculated excess air ratio in a dual fuel engine or other gas fueled compression ignition engine. The method includes determining gas excess air ratio for the engine based at least in part on at least one detected current operating parameter and calculating a predicted exhaust gas oxygen concentration engine based on the predicted gas excess air ratio. A time based filtered predicted exhaust gas oxygen concentration value may then be calculated and compared to a time-based filtered measured exhaust gas oxygen concentration value. The resultant oxygen concentration deviation value may be used to generate a corrected predicted gas excess air ratio. | 03-08-2012 |
20130074817 | AUTOMATIC SET POINT ADJUSTMENT SYSTEM AND METHOD FOR ENGINE AIR-FUEL RATIO CONTROL SYSTEM - Systems and methods for continuous automatic adjustment of a control set point of an air-fuel ratio controller of a rich burn engine so as to maintain emissions within a desired range. In an embodiment, a NOx sensor is placed in the exhaust outlet from an exhaust catalyst and the NOx exhaust sensor output is continuously monitored while adjusting the control set point between rich and lean in order to minimize the output from the NOx sensor. Corrections may be continuously made to the set point during operation of the engine to compensate for changes in environmental conditions, engine loads, and other factors. | 03-28-2013 |
20130133635 | AIR-FUEL RATIO CONTROL SYSTEM OF INTERNAL COMBUSTION ENGINE - An air-fuel ratio control system of an internal combustion engine includes a controller that performs air-fuel ratio feedback control through main feedback control and sub feedback control based on the concentrations of oxygen in exhaust gas upstream and downstream of a catalyst respectively, and the controller stores a constant component of a sub feedback correction value of the sub feedback control as a sub feedback learned value, and sets a feedback target value of the main feedback control to values that are different depending on whether or not exhaust gas is recirculated into intake air. When the constant component of the sub feedback correction value obtained when the amount of recirculated exhaust gas is short of its required amount is stored as the sub feedback learned value, the controller corrects the feedback target value of the main feedback control when the recirculation of exhaust gas is not conducted. | 05-30-2013 |
20130333677 | HUMIDITY AND FUEL ALCOHOL CONTENT ESTIMATION - Methods and systems for an engine system including an exhaust gas sensor are disclosed. In one example, under a first engine fueling condition, an air-fuel ratio correction factor is determined based on an expected air-fuel ratio and an actual air-fuel ratio. During a second engine fueling condition and a third engine non-fueling condition, fuel alcohol content and ambient humidity, respectively, are determined based on the exhaust gas sensor and corrected based on the air-fuel ratio correction factor. | 12-19-2013 |
20140283801 | INTER-CYLINDER AIR-FUEL RATIO VARIATION ABNORMALITY DETECTION APPARATUS FOR MULTICYLINDER INTERNAL COMBUSTION ENGINE - A first parameter correlated with a degree of fluctuation of output from an air-fuel ratio sensor is calculated, and whether or not the calculated first parameter has a value between a predetermined primary determination upper-limit value α1H and a primary determination lower-limit value is determined. Such forced active control as reduces an air-fuel ratio shift in one of the cylinders which is subjected to a most significant air-fuel ratio shift is performed when the calculated first parameter is determined to have a value between the predetermined primary determination upper-limit value and the primary determination lower-limit value. A first parameter is calculated while the forced active control is in execution. The calculated first parameter is compared with a predetermined secondary determination value to determine whether or not variation abnormality is present. | 09-25-2014 |
20150300282 | GAS ENGINE - A gas engine controls an air-fuel ratio in accordance with changes in the composition of fuel gas. The gas engine includes an A/F valve, a solenoid valve, and a control unit to carry out a perturbation process using the solenoid valve. A reference opening degree is specified by adjusting the opening degree of the A/F valve so that the time-average opening degree of the solenoid valve is equal to 50% in a particular engine operating environment created using reference fuel gas. The control unit resets the opening degree of the A/F valve to a value that is lower than the reference opening degree if the valve opening degree is lower than the specified reference opening degree and resets the opening degree of the A/F valve to a value that is higher than the reference opening degree if the valve opening degree is higher than the specified reference opening degree. | 10-22-2015 |
20150308361 | ENGINE CONTROL SYSTEM - An engine control system is a system configured to selectively switch between first fuel and second fuel and perform an operation control of a single engine, including: a sensor configured to detect an oxygen concentration of an exhaust gas that is exhausted from the engine; and a control device configured to perform an air-fuel ratio feedback control such that an air-fuel ratio becomes a target air-fuel ratio based on an output signal of the sensor, wherein the control device calculates a correction coefficient of an air-fuel ratio feedback control during an operation with the second fuel, and further stores a fuel composition correction coefficient that is a value in a predetermined range and corrects a difference between the calculated correction coefficient and a targeted correction coefficient arising from a change in composition of the second fuel. | 10-29-2015 |
20160252036 | SYSTEM AND METHOD FOR CONTROLLING AIR-FUEL RATIO | 09-01-2016 |