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| Number | Title | Issue Date |
| 7239955 | Method for controlling an internal combustion engine A method is provided for controlling an internal combustion engine operating in a homogenous mode. The internal combustion engine exhibits a control unit for setting the air supply, the fuel supply and the ignition angle. The method reduces the fuel consumption and ... | 07/03/2007 |
| 7228247 | Sensor hysteresis reduction A method and circuit includes a means for reducing hysteresis in a system. The method includes the definition of boundary conditions relative to an incoming signal. The boundary conditions and the incoming signal are then utilized to determine a proper correction va... | 06/05/2007 |
| 7168411 | Closed loop engine control for regulating NOx emissions, using a two-dimensional fuel-air curve An engine control strategy that ensures that NOx emissions from the engine will be maintained at an acceptable level. The control strategy is based on a two-dimensional fuel-air curve, in which air manifold pressure (AMP) is a function of fuel header pressure and en... | 01/30/2007 |
| 7117045 | Combined proportional plus integral (PI) and neural network (nN) controller A neural network controller in parallel with a proportional-plus-integral (PI) feedback controller in a control system. At least one input port of the neural network for receiving an input signal representing a condition of a process is included. A first set of data... | 10/03/2006 |
| 6988494 | Method for operating an internal combustion engine A method for operating an internal combustion engine, permitting a differentiation between an air error and a fuel error as part of mixture adaptation. In at least one operating state of the internal combustion engine a deviation in an air-fuel mixture ratio from a ... | 01/24/2006 |
| 6918385 | Air-fuel ratio detecting apparatus of engine and method thereof A temperature of an oxygen concentration detector generating an electromotive force according to a difference between oxygen concentration in an engine exhaust gas and oxygen concentration in the atmosphere, is detected, and coefficients in a transformation for conv... | 07/19/2005 |
| 6752135 | Apparatus for air/fuel ratio control A control valve module for gaseous fuels on spark ignited reciprocating engines is presented. The control valve module has a valve that controls gaseous fuel flow to a mixer or other device for air/fuel ratio control, an actuator for moving the valve position, and a... | 06/22/2004 |
| 6520168 | Air-fuel ratio controller for engine An air-fuel ratio correction coefficient calculating component is provided to an air-fuel ratio controller for an engine having the wide range air-fuel ratio sensor. In order to compensate for a time lag in detection of an air-fuel ratio detected by the w... | 02/18/2003 |
| 6374817 | Application of OP-AMP to oxygen sensor circuit A circuit for improving the resolution of an oxygen sensor in a vehicle exhaust system. The circuit expands a limited output voltage range of an oxygen sensor to full voltage range of an analog-to-digital (A/D) converter, prior to input of the expanded si... | 04/23/2002 |
| 6026795 | Electronic device for controlling the air/fuel ratio of the mixture supplied to an internal-combustion engine Control device in which a linear oxygen sensor arranged on a gas exhaust pipe of an internal-combustion engine upstream of a catalytic converter generates a signal supplied to a conversion circuit generating at its output a measured parameter representing... | 02/22/2000 |
| 6016796 | Fuel blending ratio inferring method A fuel blending ratio inferring method responsive to an air/fuel feedback control system for an internal combustion engine is disclosed having a feedback correction loop generating a feedback variable derived from an output of an exhaust gas sensor. A fue... | 01/25/2000 |
| 5970968 | Control of a multi (flexible) fueled vehicle utilizing wide range oxygen sensor feedback A method for utilizing a wide range oxygen sensor voltage output that is proportional to exhaust gas fuel air mixture to correct for variations in a flexible fueled vehicle's fuel alcohol content is provided for a vehicle not equipped with an alcohol sens... | 10/26/1999 |
| 5758630 | Fuel metering control system for internal combustion engine A fuel metering control system for an internal combustion engine including a feedback loop having an adaptive controller and an adaptation mechanism that estimates a controller parameters θ. The adaptive controller corrects the quantity of fuel injection... | 06/02/1998 |
| 5579746 | Engine lean air/fuel control system An air/fuel control system for an engine (28) provides an air/fuel indicating signal linearly related to average engine air/fuel operation from a two-state exhaust gas oxygen sensor (44). Fuel delivered to the engine is modulated with a periodic signal (1... | 12/03/1996 |
| 5511526 | Engine air/fuel control with adaptive learning An air/fuel control system for an engine (28) provides an air/fuel indicating signal linearly related to average engine air/fuel operation from a two-state exhaust gas oxygen sensor (44). Fuel delivered to the engine is modulated with a periodic signal (1... | 04/30/1996 |
| 5440877 | Air-fuel ratio controller for an internal combustion engine An alr-fuel ratio controller for-an internal-combustion engine is provided with front and rear O2 sensors respectively installed in the exhaust system on the upstream and downstream sides of an exhaust gas purifier. The controller corrects the ... | 08/15/1995 |
| 5396875 | Air/fuel control with adaptively learned reference An engine air/fuel control system includes an apparatus and method for adaptively learning a reference voltage. Fuel delivered to the engine is trimmed by a feedback variable provided by integrating a two-state signal resulting from a comparison between t... | 03/14/1995 |
| 5363831 | Method of and an apparatus for carrying out feedback control on an air-fuel ratio in an internal combustion engine An air-fuel ratio feedback correction value is used to correct the quantity of fuel supplied to an engine. The correction value is subjected to proportional-integral control to be carried out according to an air-fuel ratio detected by an oxygen sensor acc... | 11/15/1994 |
| 5320080 | Lean burn control system for internal combustion engine In a lean burn control system for an internal combustion engine, when surging in the engine is caused due to lowering of an engine lean limit, a first correction circuit decreases a target air-fuel ratio irrespective of whether the system is operated unde... | 06/14/1994 |
| 5311853 | Exhaust gas cleaning device for an internal combustion engine An exhaust gas cleaning device for controlling the air-to-fuel ratio of the air-fuel mixture supplied to an internal combustion engine (1) provided with a catalytic converter (14) disposed in the exhaust pipe (13). The air-to-fuel ratio is oscillated arou... | 05/17/1994 |
| 5251605 | Air-fuel control having two stages of operation An air-fuel control that has two stages of operation. The control includes an EGO sensor interconnected to the exhaust system of an engine and a control assembly. In a first stage of operation, the engine is allowed to operate in an open loop condition. P... | 10/12/1993 |
| 5251604 | System and method for detecting deterioration of oxygen sensor used in feedback type air-fuel ratio control system of internal combustion engine A feedback type air-fuel ratio control system controls the air-fuel ratio of air-fuel mixture fed to an internal combustion engine in accordance with an information signal issued from a first oxygen sensor installed in an exhaust line of the engine. The e... | 10/12/1993 |
| 5247910 | Air-fuel ratio control apparatus A control unit for controlling an injection amount of a fuel injection valve and performing an air-fuel ratio control of an engine has an oxygen sensor for detecting an air-fuel ratio in an exhaust outlet and an electrode plug for measuring a flame resist... | 09/28/1993 |
| 5243952 | Air-fuel ratio control apparatus for use in engine An air-fuel ratio control apparatus for an internal combustion engine which is equipped with an air-fuel ratio sensor for sensing an actual air-fuel ratio of a mixture to be introduced into the engine and a target air-fuel ratio setting section for settin... | 09/14/1993 |
| 5222471 | Emission control system for an internal combustion engine A system for controlling the air/fuel ratio input to a small engine measures the oxygen level in the engine's exhaust and compares it with a reference level. A stepper motor controls the air/fuel ratio and it is advanced one step each time a clock pulse i... | 06/29/1993 |
| 5144932 | Air-fuel ratio control method for internal combustion engines An air-fuel ratio control method for an internal combustion engine. The air-fuel ratio of an air-fuel mixture supplied to the engine is feedback-controlled to a desired air-fuel ratio in response to output from an exhaust gas ingredient concentration sens... | 09/08/1992 |
| 4993393 | Air-fuel ratio feedback control method for internal combustion engines A method of controlling air-fuel ratio of a mixture supplied to an internal combustion engine in a feedback manner responsive to an output signal from an exhaust gas concentration sensor. The air-fuel ratio of the mixture is controlled to a desired value ... | 02/19/1991 |
| 4945882 | Multi-fuel engine control with oxygen sensor signal reference control A fuel control for an engine using a liquid fuel mixture of two fuels such as gasoline and methanol acts in closed loop on a vehicle exhaust mounted oxygen sensor to maintain a stoichiometric air/fuel ratio. The closed loop portion of the control compares... | 08/07/1990 |
| 4825837 | Air/fuel ratio control system having gain adjusting means An air/fuel ratio control system for an internal combustion engine is composed of a wide range oxygen sensor capable of sensing an actual air/fuel ratio from a rich side to a lean side, and a control unit having a reference determining section for determi... | 05/02/1989 |
| 4825838 | Air/fuel ratio control apparatus for an internal combustion engine In an internal combustion engine, in which, during the lean-burn region of its operation, fuel supplied for the engine is controlled so as to make an acutal air/fuel ratio follow a predetermined lean air/fuel ratio, an air/fuel ratio control apparatus det... | 05/02/1989 |
| 4744344 | System for compensating an oxygen sensor in an emission control system A system has an oxygen sensor, a proportion and integration circuit responsive to the output of the oxygen sensor for producing a PI signal at a constant of proportionality and a constant of integration and for controlling the air-fuel ratio of mixture to... | 05/17/1988 |
| 4624232 | Apparatus for controlling air-fuel ratio in internal combustion engine In an apparatus for the feedback control of the air-fuel ratio in an internal combustion engine using the output signal of an air-fuel ratio sensor, a degree of deterioration of the functioning of the air-fuel ratio sensor is detected by using successive ... | 11/25/1986 |
| 4601273 | Air/fuel ratio monitoring system in IC engine using oxygen sensor An air/fuel ratio monitoring system in an IC engine, using an oxygen sensor of the concentration cell type which has an inner electrode layer, a microscopically porous layer of oxygen ion conductive solid electrolyte, and an outer electrode layer to be ex... | 07/22/1986 |
| 4594984 | Regulation device for the mixture composition of an internal combustion engine A regulating device is proposed for the mixture composition of an internal combustion engine having a signal sensor and having regulating ranges which can be switched over between lambda equals one and the lean range. The lambda-equal-to-one regulation is... | 06/17/1986 |
| 4526001 | Method and means for controlling air-to-fuel ratio A method for controlling the air-to-fuel ratio fed to an engine or other combustion device provides for periodically adjusting the air-to-fuel ratio to stoichiometric or near stoichiometric, within the response range of the conventional exhaust gas sensor... | 07/02/1985 |
| 4502444 | Air-fuel ratio controller A system for the control of the air-fuel ratio in an internal combustion engine incorporates an electronic control unit, a sensor of exhaust emissions and a valve for metering fuel with air to control the air-fuel ratio. The electronic control unit provid... | 03/05/1985 |
| 4494374 | Air/fuel ratio monitoring system in IC engine using oxygen sensor An air/fuel ratio monitoring system in an IC engine, using an oxygen sensor of the concentration cell type which has a laminate comprising an inner electrode layer, a microscopically porous layer of oxygen ion conductive solid electrolyte and an outer ele... | 01/22/1985 |
| 4491921 | Method and apparatus for controlling the air fuel ratio in an internal combustion engine An output voltage from an O2 sensor is intermittently sampled and the sampled voltage is converted into a binary signal. The binary signal is applied to an electrical digital computer, and therein the following operations are carried out. First... | 01/01/1985 |
| 4459669 | Method and apparatus for controlling the air-fuel ratio in an internal combustion engine An output voltage from an O2 sensor is intermittently sampled and the sampled voltage is converted into a binary signal. The binary signal is applied to an electrical digital computer, and therein the following operations are carried out. First... | 07/10/1984 |
| 4458319 | Method and apparatus for controlling the air-fuel ratio in an internal combustion engine An output voltage from an O2 sensor is intermittently sampled and the sampled voltage is converted into a binary signal. The binary signal is applied to an electrical digital computer, and therein the following operations are carried out. First... | 07/03/1984 |
