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| Number | Title | Issue Date |
| 7802563 | Air/fuel imbalance monitor using an oxygen sensor Air/fuel imbalance monitoring systems and methods for monitoring air/fuel ratio imbalance of an internal combustion engine are disclosed. In one embodiment, an oxygen sensor is sampled above cylinder firing frequency and a ratio of data from at least one window over... | 09/28/2010 |
| 7367180 | System and method for controlling valve timing of an engine with cylinder deactivation Various systems and methods are disclosed for carrying out combustion in a fuel-cut operation in some or all of the engine cylinders of a vehicle. Further, various subsystems are considered, such as fuel vapor purging, air-fuel ratio control, engine torque control, ... | 05/06/2008 |
| 7328673 | Valve timing correction control apparatus and method for an internal combustion engine A valve timing correction control apparatus for an internal combustion engine is provided. The engine includes a plurality of banks and variable valve operating mechanisms disposed at the respective banks for variably controlling valve timings of intake valves separ... | 02/12/2008 |
| 7319930 | Method for balancing out the differences in the injection quantities between the cylinders in an internal combustion engine In a method for equalizing the differences in injection quantities between the cylinders of a combustion engine, an adaptation of the differences in injection quantities, of the injection curves and of the hydraulic start of injection is carried out for different op... | 01/15/2008 |
| 7234455 | Robust maximum engine torque estimation A system for a vehicle comprising of an engine including a first cylinder group and a second cylinder group; a linear exhaust gas sensor coupled exclusively to the first cylinder group; a switching exhaust gas sensor coupled exclusively to the second cylinder group;... | 06/26/2007 |
| 7225801 | Default mode for lean burn engine A multi-cylinder group engine system operable in at least a first mode and a second mode, where in the first mode a first and second cylinder group combust air and fuel with a lean air-fuel ratio, and where in the second mode at least one of the first and second cyl... | 06/05/2007 |
| 7225800 | Engine controller The invention provides an engine controller, which can determine a deterioration mode (gain deterioration or response deterioration) of an air/fuel (A/F) ratio sensor, can detect a degree of the deterioration with high accuracy, and can optimize A/F ratio feedback c... | 06/05/2007 |
| 7203591 | Method for controlling an internal combustion engine A method for controlling an internal combustion engine in which each cylinder of the internal combustion engine is assigned at least one system deviation and at least one controller, each controller predefining a cylinder-specific control signal on the basis of the ... | 04/10/2007 |
| 7146799 | Computer controlled engine air-fuel ratio adjustment A microprocessor-based controller is provided for generated heat in at various locations in an exhaust system of an engine by changing the heat generation technique utilized. In one case, some cylinder air-fuel ratios are modulated between stoichiometry and rich, wh... | 12/12/2006 |
| 7140360 | System for controlling exhaust emissions produced by an internal combustion engine A system for controlling the air-to-fuel ratio in an internal combustion engine includes an air intake conduit coupled to an intake manifold, an EGR valve disposed in-line with an EGR conduit responsive to a valve control signal, a lambda sensor producing a lambda s... | 11/28/2006 |
| 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 |
| 7047916 | Two-stroke internal combustion engine with free opposed pistons A two-stroke internal combustion engine comprises a first cylinder and a second cylinder arranged on a common axis. A first piston pair comprises a first piston and a second piston located in the first cylinder and defining a first combustion chamber. The first pist... | 05/23/2006 |
| 6925372 | Control apparatus, control method, and engine control unit A control apparatus, a control method, and an engine control unit are provided for controlling an output of a controlled object which has a relatively large response delay and/or dead time to rapidly and accurately converge to a target value. When the output of the ... | 08/02/2005 |
| 6920752 | Exhaust emission control device of internal-combustion engine An exhaust emission control device of an internal-combustion engine comprises a three-way catalytic converter provided in an exhaust passage of the internal-combustion engine, and an air-fuel ratio varying element for forcedly varying an air-fuel ratio of exhaust fl... | 07/26/2005 |
| 6868827 | Method for controlling transitions between operating modes of an engine for rapid heating of an emission control device A method is disclosed for controlling operation of an engine coupled to an exhaust treatment catalyst. Under predetermined conditions, the method operates an engine with a first group of cylinders combusting a lean air/fuel mixture and a second group of cylinders pu... | 03/22/2005 |
| 6837231 | Cylinder bank work output balancing based on exhaust gas A/F ratio A system for balancing first and second work outputs between first and second cylinder banks of an engine includes a first intake camshaft associated the first cylinder bank and a first fuel injector associated with the first cylinder bank. A controller trims a puls... | 01/04/2005 |
| 6792901 | Control system of internal combustion engine A control system of an internal combustion engine is comprised of an operation angle adjustment mechanism which continuously varies an operation angle of intake valves of the engine, an air-fuel ratio detector which detects an exhaust parameter indicative of air-fue... | 09/21/2004 |
| 6735937 | Engine air and fuel control A control method for an internal combustion engine has multiple cylinder groups with at least one control device positioned between an intake manifold and a cylinder group. The engine operates the cylinder groups at different air/fuel ratio and uses the control devi... | 05/18/2004 |
| 6718959 | Fuel control method for internal combustion engine The invention provides a fuel control method and system for an internal combustion engine. The method includes: calculating an initial amount of fuel based on an amount of intake air, calculating a first cylinder bank air/fuel ratio matching coefficient and a second... | 04/13/2004 |
| 6553982 | Method for controlling the phase difference of air/fuel ratio oscillations in an engine A method for controlling the phasing of first and second air/fuel ratio oscillations in first and second cylinder groups, respectively, of an internal combustion engine is provided. The method includes determining a phase difference between the first air/... | 04/29/2003 |
| 6553756 | Method for selecting a cylinder group when changing an engine operational parameter A method for selecting one of first and second cylinder groups of an internal combustion engine is provided. The first and second cylinder groups are coupled with first and second catalytic converters, respectively. The method includes identifying one of ... | 04/29/2003 |
| 6550466 | Method for controlling the frequency of air/fuel ratio oscillations in an engine A method for controlling first and second air/fuel ratio oscillations in first and second cylinder groups, respectively, of an internal combustion engine is provided. The method includes determining a first frequency of the first air/fuel ratio oscillatio... | 04/22/2003 |
| 6499475 | Method for operating an internal combustion engine An internal combustion engine (10) has a plurality of cylinders which are arranged in two cylinder banks. A sensor (131, 132) is assigned to each of the two cylinder banks for determining the composition of the exhaust gas. A control apparatus is provided... | 12/31/2002 |
| 6497228 | Method for selecting a cylinder group when adjusting a frequency of air/fuel ratio oscillations A control system and method is provided for selecting one of first and second cylinder groups of an internal combustion engine when a frequency of air/fuel ratio oscillations in the selected cylinder group is to be adjusted. The method includes determinin... | 12/24/2002 |
| 6496767 | Constant groundspeed autoshift method and apparatus for maximizing fuel economy A method of determining shift points in a step gear transmission system to maximize fuel economy is disclosed. In operation, the method uses fuel economy data from a first gear ratio to determine a first series of constant fuel consumption curves for the ... | 12/17/2002 |
| 6477458 | Air-fuel ratio control apparatus for internal combustion engine The characteristics of the output of an exhaust gas sensor with respect to the air-fuel ratio of an engine are expressed by a nonlinear function such as a quadratic function or the like, and the parameters of the nonlinear function are sequentially identi... | 11/05/2002 |
| 6370473 | Air-fuel ratio control apparatus for multicylinder internal combustion engine An exhaust system is regarded as being equivalent to a system for generating an output of an O2 sensor or exhaust gas sensor from a combined air-fuel ratio that is produced by combining outputs of air-fuel ratio sensors associated with respecti... | 04/09/2002 |
| 6347514 | Air-fuel ratio control system for engine In an engine having first and second cylinder groups, a first sensor senses an air-fuel ratio of an exhaust gas mixture into a first catalytic converter for the first cylinder group, a second sensor senses an air-fuel ratio of an exhaust gas mixture into ... | 02/19/2002 |
| 6327850 | Air-fuel ratio control apparatus for multicylinder internal combustion engine An object system is regarded as being equivalent to a system for generating an output of an O2 sensor or exhaust gas sensor from a target combined air-fuel ratio that is produced by combining target air-fuel ratios KCMD for respective cylinder ... | 12/11/2001 |
| 6325056 | Operating method for an internal combustion engine with lambda-value control The invention relates to a method for the cylinder-selective control of an air/fuel mixture to be burnt in a multi-cylinder internal combustion engine, in which the lambda values for different cylinders or groups of cylinders are separately sensed and con... | 12/04/2001 |
| 6205776 | Air-fuel ration control system for multi-cylinder internal combustion engine An air-fuel ratio control system for a multi-cylinder internal combustion engine is equipped with an exhaust emission control catalyst disposed in an exhaust passage of the engine, air-fuel ratio control means for controlling an air-fuel ratio of at least... | 03/27/2001 |
| 6202415 | Method and device for monitoring the functioning of two exhaust-gas turbochargers A separate irregular-running determination is carried out for each cylinder bank. Each ascertained irregular-running value is compared to a lower and an upper threshold value, the upper threshold value being set in such a way that all irregular-running va... | 03/20/2001 |
| 6186131 | Fuel injection amount control method and apparatus for internal combustion engine The engine of the present invention has a plurality of cylinders that are divided into a first group and a second group. An air flow meter for detecting an amount of air supplied to the engine is provided downstream of an air cleaner in an intake system. ... | 02/13/2001 |
| 6050250 | Defect recognition device for internal-combustion engines and process for operating an internal-combustion engine A defect recognition device is provided for internal-combustion engines, as well as a process for operating an internal-combustion engine having at least two exhaust gas trains, with one lambda probe respectively being in each exhaust gas train. A joint m... | 04/18/2000 |
| 5954039 | Air/fuel ratio control system An air/fuel control system (8) and method for an engine (28) having two engine banks coupled to a single catalytic converter (50) uses first and second exhaust gas oxygen sensors (44, 55) coupled to respective first and second exhaust manifolds (56, 57) a... | 09/21/1999 |
| 5894727 | Method and system for generating an inferred EGO signal in an asymmetrical Y-pipe exhaust system A method and system for generating an inferred EGO sensor signal for use in monitoring operation of a catalytic convertor in an asymmetrical Y-pipe vehicle exhaust system utilizes current engine airflow and engine speed readings as address inputs for a lo... | 04/20/1999 |
| 5749221 | Air-fuel ratio control system and method thereof In a horizontally opposed type engine, right and left exhaust pipes are provided for right and left cylinder banks, respectively and a collecting pipe is disposed to collect gases these two exhaust pipes. Further, in a two-stage catalytic converter system... | 05/12/1998 |
| 5570574 | Air-fuel ratio control system for internal combustion engine An air-fuel ratio control system for an internal combustion engine includes a pair of cylinder banks, a pair of exhaust passages connected to the cylinder banks, respectively, a common exhaust pipe where the exhaust passages join each other at their downs... | 11/05/1996 |
| 5566071 | Air/fuel ratio estimation system for internal combustion engine A system for estimating air/fuel ratios in the individual cylinders of a multicylinder internal combustion engine from the output of a single air/fuel ratio sensor installed at the exhaust system of the engine. A mathematical model is first designed to de... | 10/15/1996 |
| 5511377 | Engine air/fuel ratio control responsive to stereo ego sensors An air/fuel control system (8) and method for an engine (28) having two engine banks coupled to a single catalytic converter (50). First and second exhaust gas oxygen sensors (44, 55) are coupled to respective first and second exhaust manifolds (56, 57). ... | 04/30/1996 |
