| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 123673000 | With sensor controlling each cylinder individually | 18 |
| 20080236555 | AIR/FUEL RATIO CONTROL SYSTEM FOR INTERNAL COMBUSTION ENGINE - An air/fuel ratio control system is provided for an internal combustion engine having a plurality of cylinders and an air/fuel ratio sensor. The air/fuel ratio sensor is disposed at an exhaust gas merging portion of an exhaust passage where exhaust gas discharged from the plurality of cylinders merges together. The system includes an air/fuel ratio control device, an abnormality diagnosis device, and an enabling device. The air/fuel ratio control device individually controls an air/fuel ratio of each of the plurality of cylinders based on an output of the air/fuel ratio sensor. The abnormality diagnosis device determines whether abnormality of the air/fuel ratio sensor exists. The enabling device enables the air/fuel ratio control device to execute the controlling of the air/fuel ratio of each of the plurality of cylinders when the abnormality diagnosis device determines that the abnormality of the air/fuel ratio sensor does not exist after starting of the engine. | 10-02-2008 |
| 20090078242 | METHOD AND DEVICE FOR OPERATING AN INTERNAL COMBUSTION ENGINE - In a lower partial load range of, a setpoint value of the mass flow of air into the combustion chambers is determined as a function of a predefined torque request such that it is greater than necessary for implementing the predefined torque request and large enough that individual exhaust packets can be differentiated from one another with the exhaust gas probe. Depending on the air/fuel ratio setpoint value, an actuator is actuated whose position affects the actual air mass flow. To implement the torque request, engine efficiency is simultaneously reduced by actuating another actuator. A measurement signal of the exhaust gas probe is detected. The air/fuel ratios of the exhaust packets are determined as a function of the measurement signal detected. At least one operating parameter affecting the air/fuel ratio in at least one of the cylinders is adapted as a function of the air/fuel ratios determined. | 03-26-2009 |
| 20090272367 | Method And Device For Operating An Internal Combustion Engine - By a respective cylinder-specific lambda regulator, a regulator value for influencing the air/fuel ratio in the respective cylinder is determined as a function of the cylinder-specific air/fuel ratio measured for the respective cylinder. The regulator value is monitored for the attainment of a first predefined threshold value, and when the latter is reached, a lambda quality value is determined which is representative of the deviation of the measured cylinder-specific air/fuel ratios assigned to the respective cylinders. The regulator value is monitored for the attainment of a second predefined threshold value which is representative of a more pronounced regulating intervention than the first threshold value. When the second predefined threshold value is reached, the lambda quality value is determined. If the lambda quality value assigned to the first threshold value is lower than the value assigned to the second threshold value, unstable regulating behaviour is identified. Stable regulating behaviour is identified otherwise. | 11-05-2009 |
| 20110214649 | Control System for Gas Engine - A control system for a gas engine including a controller being configured to execute load equalization control such that a fuel feed amount corresponding to a higher-temperature cylinder of a first predetermined number which is selected to include a highest exhaust gas temperature, among cylinders which are controlled targets, is reduced, and a fuel feed amount corresponding to a lower-temperature cylinder of a second predetermined number which is selected to include a lowest exhaust gas temperature, among the cylinders which are the controlled targets, is increased; and a sum of the first predetermined number and the second predetermined number being less than the number of all of the plurality of cylinders so that there is a cylinder whose fuel feed amount is not changed. | 09-08-2011 |
| 20120080016 | INDIVIDUAL CYLINDER FUEL CONTROL SYSTEMS AND METHODS FOR OXYGEN SENSOR DEGREDATION - A system includes an offset determination module and a correction determination module. The offset determination module determines an offset value based on an average response time of an exhaust gas oxygen (EGO) sensor located upstream of a catalyst in an exhaust system. The offset value relates one of a predetermined number of cylinder imbalance values to a cylinder of an engine. The correction determination module determines a fueling correction for the cylinder based on the offset value and one of the predetermined number of cylinder imbalance values. | 04-05-2012 |
| 20120255531 | INTER-CYLINDER AIR/FUEL RATIO IMBALANCE ABNORMALITY DETECTION APPARATUS AND INTER-CYLINDER AIR/FUEL RATIO IMBALANCE ABNORMALITY DETECTION METHOD FOR MULTICYLINDER INTERNAL COMBUSTION ENGINE - An inter-cylinder air/fuel ratio imbalance abnormality detection apparatus for a multicylinder internal combustion engine includes a fuel injection amount change control portion that executes a fuel injection amount change control of forcing a fuel injection amount of a predetermined object cylinder to change by a predetermined amount; an ignition timing retardation control portion that executes an ignition timing retardation control for the predetermined object cylinder; and a detection portion that detects an inter-cylinder air/fuel ratio imbalance abnormality based on output fluctuation regarding the predetermined object cylinder occurring when the fuel injection amount change control and the ignition timing retardation control are executed together for the predetermined object cylinder. | 10-11-2012 |
| 20120255532 | CONTROLLER FOR INTERNAL COMBUSTION ENGINE - In view of a difference in detectability of an air-fuel ratio sensor with respect to each cylinder, a first exhaust system model and a second exhaust system model are defined. The first exhaust system model outputs an air-fuel ratio at the confluent portion based on an air-fuel ratio in a cylinder. The second exhaust system model outputs a detection value of the exhaust gas sensor based on the air-fuel ratio at the confluent portion. A confluent-portion-air-fuel ratio estimating portion designed based on the second exhaust system model estimates the air-fuel ratio at the confluent portion. A combust-air-fuel ratio estimating portion designed based on the first exhaust system model estimates a combust-air-fuel ratio in each cylinder. | 10-11-2012 |
| 20130186380 | CONTROL SYSTEM FOR INTERNAL COMBUSTION ENGINE - A control system for an internal combustion engine, wherein in the control system, an in-cylinder oxygen amount is calculated and a compression end temperature, which is a temperature of the pressurized air-fuel mixture, is calculated according to an intake air temperature. A fuel injection parameter is determined according to the compression end temperature, the in-cylinder oxygen amount, and an engine rotational speed. The fuel injector is controlled based on the determined fuel injection parameter. By determining the fuel injection parameter according to the compression end temperature in addition to the in-cylinder oxygen amount, the combustion state is adjusted when the compression end temperature is low, thereby maintaining a stable combustion state. | 07-25-2013 |
| 20140326227 | Method and Device for Operating an Internal Combustion Engine - An internal combustion engine has a plurality of cylinders with fuel-metering injection valves, and an exhaust gas probe that generates a measurement signal characteristic of the air/fuel ratio in the respective cylinder. A correction signal for fuel mass to be metered is determined using a lambda controller as a function of the exhaust gas probe measurement signal. When at least one predefined condition is met within a predefined operating range of the engine, a cylinder-specific diagnosis relating to the emissions of pollutants is performed on the basis of unsmooth running, wherein the cylinder-specific diagnosis is actively performed only in a respective detection phase that is applied to a neutral value by a modified proportional discrete level of the correction signal and is performed with a modified integral parameter of the lambda controller that is reduced as compared with an integral parameter in a normal operating mode of the lambda controller. | 11-06-2014 |
| 20140360477 | SYSTEM AND METHOD FOR DETERMINING VALVE OPERATION - Systems and methods for determining operation of a cylinder deactivating/reactivating device are disclosed. In one example, degradation of the cylinder deactivating/reactivating device is based on intake manifold oxygen concentration. | 12-11-2014 |
| 20150068505 | CYLINDER-BY-CYLINDER AIR-FUEL-RATIO CONTROLLER FOR INTERNAL COMBUSTION ENGINE - An air-fuel-ratio of each cylinder is estimated based on a detection value of an air-fuel-ratio sensor. An air-fuel-ratio detection timing determination is executed to determine whether a deviation in air-fuel-ratio detection timing exists based on the estimated air-fuel-ratio while the cylinder-by-cylinder air-fuel-ratio control is performed. An observation residual is computed based on the detection value of the air-fuel-ratio sensor and the estimated air-fuel-ratio. When the observation residual is greater than or equal to a specified threshold value, the air-fuel-ratio detection timing determination is prohibited. Therefore, when the observation residual is still large before the estimated air-fuel-ratio of each cylinder is converged, or when the observation residual is still large due to a temporal deterioration in estimating accuracy of the estimated air-fuel-ratio, the air-fuel-ratio detection timing determination can be prohibited. | 03-12-2015 |
| 20150075507 | CYLINDER-BY-CYLINDER AIR-FUEL-RATIO CONTROLLER FOR INTERNAL COMBUSTION ENGINE - An ECU executes a cylinder-by-cylinder air-fuel-ratio control in which an air-fuel-ratio of each cylinder is estimated based on a detection value of an air-fuel-ratio sensor to adjust the air-fuel-ratio of each cylinder. Further, the ECU computes a learning value of a correction quantity for each cylinder, which is obtained by executing the cylinder-by-cylinder air-fuel-ratio control. Then, the ECU determines whether the estimated air-fuel-ratio has converged according to whether the estimated air-fuel-ratio of each cylinder has been closer to a target value than a specified value for not less than a specified time period. A computation of the learning value is prohibited until the estimated air-fuel-ratio has converged. Therefore, it can be avoided to compute the learning value based on the fuel correction quantity that is obtained when the estimated air-fuel-ratio has not converged yet. | 03-19-2015 |
| 20150345416 | SYSTEM AND METHOD FOR DETECTING AIR FUEL RATIO IMBALANCE - A system and method of detecting fueling imbalance(s) in an internal combustion engine is provided. The method includes receiving data regarding an oxygen content of engine exhaust for the engine operating at a cycle rate. Frequency component analysis is performed comprising a filtering operation on the received oxygen content data. The filtering is done at the cycle rate of the engine or harmonics thereof to obtain filtered oxygen content data. Then, the method/system determines at least one of: 1) one or more angles of the engine at which the filtered oxygen content data exhibits a first amplitude value characteristic relative to amplitude values at other angles; and 2) a shape of the filtered oxygen content data obtained by sampling at pre-defined engine angles. The method/system then identifies a cylinder experiencing a fueling imbalance responsive to the determined at least one of one or more angle(s) and shape of the data. | 12-03-2015 |
| 20160053701 | INDIVIDUAL CYLINDER AIR-FUEL RATIO CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE - An individual cylinder air-fuel ratio estimation of estimating an air-fuel ratio of an individual cylinder is performed on a sensed value of an air-fuel ratio sensor set in an exhaust gas collection part of an engine, and an individual cylinder air-fuel ratio control of controlling the air-fuel ratio of the individual cylinder is performed in such a way that a variation in the air-fuel ratio between the cylinders becomes small on the basis of an estimated air-fuel ratio of the individual cylinder. Further, it is determined whether or not a misfire of the engine is caused and when it is determined that the misfire of the engine is caused, the individual cylinder air-fuel ratio estimation and the individual cylinder air-fuel ratio control are stopped and an individual cylinder correction value by the individual cylinder air-fuel ratio control is reset. In this way, it is possible to avoid the individual cylinder air-fuel ratio control from being performed continuously as usual in a state where the air-fuel ratio of the individual cylinder cannot be controlled correctly due to the effect of the misfire. | 02-25-2016 |
| 20160061127 | ENGINE DIAGNOSTICS WITH SKIP FIRE CONTROL - Methods and devices are described for performing engine diagnostics during skip fire operation of an engine while a vehicle is being driven. Knowledge of the firing sequence is used to determine appropriate times to conduct selected diagnostics and/or to help better interpret sensor inputs or diagnostic results. In one aspect, selected diagnostics are executed when a single cylinder is fired a plurality of times in isolation relative to a sensor used in the diagnosis. In another aspect, selected diagnostics are conducted while the engine is operated using a firing sequence that insures that no cylinders in a first cylinder bank are fired for a plurality of engine cycles while cylinders in a second bank are at least sometimes fired. The described tests can be conducted opportunistically, when conditions are appropriate, or specific firing sequences can be commanded to achieve the desired isolation or skipping of one or more selected cylinders. | 03-03-2016 |
| 20160123257 | POST-CATALYST CYLINDER IMBALANCE MONITOR - Methods and systems are provided for detecting cylinder air-fuel imbalance. In one example, a method may include adjusting engine operation based on an indication of cylinder air-fuel imbalance. The imbalance may be detected based on output from a second exhaust gas sensor and a plurality of individual cylinder weighting factors, the second sensor located in an exhaust system downstream of a first sensor located in the exhaust system. | 05-05-2016 |
| 20160169134 | METHOD FOR OPERATION OF AN INTERNAL COMBUSTION ENGINE | 06-16-2016 |
| 20170234255 | INDIVIDUAL CYLINDER AIR-FUEL RATIO CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE | 08-17-2017 |
