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US 7,007,462 B2Granted
Combustion control apparatus for internal combustion engine
AssigneeNissan Motor Co., Ltd.
InventorYasuhisa Kitahara
Life of this patent
Estimating the term…
Abstract
A combustion control apparatus operates an internal combustion engine in a split retard combustion mode during regenerating an exhaust purifier such as a NOx trap. In the split retard combustion mode, the combustion control apparatus controls a first fuel injection to cause preliminary combustion at or near top dead center, and controls a second fuel injection to cause main combustion after an end of the preliminary combustion. In this manner, the combustion control apparatus controls an exhaust gas temperature, or an exhaust air-fuel ratio, without increasing exhaust smoke. During the split retard combustion mode, the combustion control apparatus controls a quantity of the first fuel injection, in accordance with an ignition lag of the preliminary combustion.
Claims21
A combustion control apparatus for an internal combustion engine, comprising:
- an exhaust purifier in an exhaust passage of the engine;
- a combustion controlling actuator for causing combustion in a combustion chamber of the engine;
- a controller for controlling the combustion controlling actuator;
- and
- the controller configured to perform the following:
- switching a combustion mode between a normal combustion mode and a split retard combustion mode, in accordance with an condition of the exhaust purifier;
- performing the following in the normal combustion mode:
- producing normal combustion to generate an output torque of the engine;
- and
- performing the following in the split retard combustion mode:
- producing preliminary combustion at or near top dead center, to release a predetermined quantity of heat in the combustion chamber;
- starting main combustion at a timing later than a start timing of the normal combustion in the normal combustion mode, after an end of the preliminary combustion, to generate the output torque of the engine;
- determining an ignition lag between a start timing of a first fuel injection for the preliminary combustion and a start timing of the preliminary combustion, in accordance with an operating condition of the engine;
- and
- adjusting a first fuel injection quantity of the first fuel injection, in accordance with the ignition lag of the preliminary combustion.
12 more elements
A combustion control apparatus for an internal combustion engine, comprising:
- a fuel injector for injecting fuel directly into a combustion chamber of the engine;
- a controller for controlling the fuel injector;
- and
- the controller configured to perform the following:
- switching a combustion mode between a normal combustion mode and a split retard combustion mode, in accordance with an operating condition of the engine;
- performing the following in the normal combustion mode:
- controlling a normal fuel injection to produce normal combustion to generate an output torque of the engine;
- and
- performing the following in the split retard combustion mode:
- controlling a first fuel injection to produce preliminary combustion at or near top dead center, to release a predetermined quantity of heat;
- starting a second fuel injection at a timing later than a start timing of the normal fuel injection in the normal combustion mode, to start main combustion after an end of the preliminary combustion, to generate the output torque of the engine;
- and
- determining an ignition lag between a start timing of the first fuel injection and a start timing of the preliminary combustion, in accordance with the operating condition of the engine;
- and
- adjusting a first fuel injection quantity of the first fuel injection, in accordance with the ignition lag of the preliminary combustion.
12 more elements
A combustion control apparatus for an internal combustion engine, comprising:
- exhaust purifying means for purifying exhaust gas;
- combustion controlling means for causing combustion in a combustion chamber of the engine;
- control means for controlling the combustion controlling means;
- and
- the control means configured to perform the following:
- switching a combustion mode between a normal combustion mode and a split retard combustion mode, in accordance with an condition of the exhaust purifier;
- performing the following in the normal combustion mode:
- producing normal combustion to generate an output torque of the engine;
- and
- performing the following in the split retard combustion mode:
- producing preliminary combustion at or near top dead center, to release a predetermined quantity of heat in the combustion chamber;
- starting main combustion at a timing later than a start timing of the normal combustion in the normal combustion mode, after an end of the preliminary combustion, to generate the output torque of the engine;
- determining an ignition lag between a start timing of a first fuel injection for the preliminary combustion and a start timing of the preliminary combustion, in accordance with an operating condition of the engine;
- and
- adjusting a first fuel injection quantity of the first fuel injection, in accordance with the ignition lag of the preliminary combustion.
12 more elements
A method of controlling combustion for an internal combustion engine including an exhaust purifier, the method comprising:
- switching a combustion mode between a normal combustion mode and a split retard combustion mode, in accordance with an condition of the exhaust purifier;
- performing the following in the normal combustion mode:
- producing normal combustion to generate an output torque of the engine;
- and
- performing the following in the split retard combustion mode:
- producing preliminary combustion at or near top dead center, to release a predetermined quantity of heat in the combustion chamber;
- starting main combustion at a timing later than a start timing of the normal combustion in the normal combustion mode, after an end of the preliminary combustion, to generate the output torque of the engine;
- determining an ignition lag between a start timing of a first fuel injection for the preliminary combustion and a start timing of the preliminary combustion, in accordance with an operating condition of the engine;
- and
- adjusting a first fuel injection quantity of the first fuel injection, in accordance with the ignition lag of the preliminary combustion.
7 more elements
Dependencies are inferred from the claim text.