Abstract: To provide a control system for an internal combustion engine, which is capable of providing a stable intake air amount through reduction of pumping loss and blow-back of combustion gases by appropriately controlling the valve-opening timing of the intake valves, and thereby being capable of securing excellent drivability. In the control system 1, the valve-closing timing of the exhaust valve 9 is changed by an exhaust-side variable valve-operating mechanism 60, whereby the internal EGR amount is controlled, and the valve-opening timing of an intake valve 8 of an internal combustion engine 3 is changed by an intake-side variable valve-operating mechanism 40.

Abstract: An ignition timing control system for an internal combustion engine is provided to ensure stable combustion without causing misfire or knocking, by properly setting ignition timing in the compression stroke injection mode, thereby improving drivability. The ignition timing control system for the engine, that directly injects fuel into the cylinders and that is operated by switching the fuel injection mode between an intake stroke injection mode and a compression stroke injection mode, includes a fuel injection timing-setting device for setting a fuel injection timing according to an engine speed of the engine and a fuel injection amount, a basic value-setting device for setting a basic value of ignition timing according to the engine speed of the engine and the fuel injection timing, and an ignition timing-setting device for setting ignition timing in the compression stroke injection mode by correcting the basic value according to a detected air-fuel ratio.

Abstract: There is provided an internal EGR control system for an internal combustion engine, which is capable of ensuring an excellent combustion state by properly controlling an internal EGR amount.

Abstract: There is provided an internal EGR control device for an internal combustion engine, which, even when a change in the actual valve timing of exhaust valves is caused by aging, is capable of properly controlling an internal EGR amount while compensating for an adverse influence caused by the change, and thereby properly controlling the temperature within the cylinder. The internal EGR control device 1 sets a target internal EGR amount EGRINCMD which serves a target of the internal EGR amount, according to detected operating conditions, NE and PMCMD, of the engine 3, and calculates internal energy QACT possessed by burned gases, which is determined according to the amount and temperature of the burned gases. Further, the target internal EGR amount EGRINCMD is corrected according to the calculated internal energy, and the valve-closing timing of the exhaust valve 9 is calculated according to the corrected internal EGR amount EGRIN.

Abstract: There is provided an internal EGR control device for an internal combustion engine, which, even when a change in the actual valve timing of exhaust valves is caused by aging, is capable of properly controlling an internal EGR amount while compensating for an adverse influence caused by the change, and thereby properly controlling the temperature within the cylinder. The internal EGR control device 1 sets a target internal EGR amount EGRINCMD which serves a target of the internal EGR amount, according to detected operating conditions, NE and PMCMD, of the engine 3, and calculates internal energy QACT possessed by burned gases, which is determined according to the amount and temperature of the burned gases. Further, the target internal EGR amount EGRINCMD is corrected according to the calculated internal energy, and the valve-closing timing of the exhaust valve 9 is calculated according to the corrected internal EGR amount EGRIN.

Abstract: To provide a control system for an internal combustion engine, which is capable of providing a stable intake air amount through reduction of pumping loss and blow-back of combustion gases by appropriately controlling the valve-opening timing of the intake valves, and thereby being capable of securing excellent drivability. In the control system 1, the valve-closing timing of the exhaust valve 9 is changed by an exhaust-side variable valve-operating mechanism 60, whereby the internal EGR amount is controlled, and the valve-opening timing of an intake valve 8 of an internal combustion engine 3 is changed by an intake-side variable valve-operating mechanism 40.

Abstract: To provide an ignition timing control system for an internal combustion engine, which is capable of ensuring stable combustion without causing a misfire or knocking, by properly setting ignition timing in the compression stroke injection mode, thereby making it possible to improve drivability.

Abstract: There is provided an internal EGR control system for an internal combustion engine, which is capable of ensuring an excellent combustion state by properly controlling an internal EGR amount.

Abstract: An internal EGR control system for an internal combustion engine, which is capable of controlling the internal EGR amount with accuracy, when controlling the internal EGR by changing both the exhaust cam phase and the exhaust valve lift. An internal EGR control system for an internal combustion engine controls internal EGR in which combustion gases are caused to remain in a cylinder. An ECU sets a target cam phase serving as a target of the exhaust cam phase, and controls a variable exhaust cam phase mechanism such that the exhaust cam phase becomes equal to the target cam phase. ECU 2 sets a target lift of an exhaust valve according to a detected actual cam phase and calculated valve-closing timing, and controls a variable exhaust valve lift mechanism such that the lift of the exhaust valve becomes equal to the target lift.

Abstract: A control apparatus and method for an internal combustion engine are provided for ensuring a stable combustion state and improving the fuel efficiency when an air-fuel mixture is burnt with self ignition while auxiliarily using a spark ignition. The control apparatus for an internal combustion engine which is operated in a plurality of modes including a torch self ignition combustion mode comprises an ECU. In the torch self ignition combustion mode, the ECU controls an internal EGR amount, calculates an actual exhaust closing angle, calculates a target exhaust closing angle, calculates a closing angle deviation, calculates a fuel injection amount for forming a homogeneous air-fuel mixture, calculates a correction coefficient in accordance with the closing angle deviation, and corrects a basic value by the correction coefficient to calculate a fuel injection amount for forming a stratified air-fuel mixture.

Abstract: A fuel injection control apparatus and method for an internal combustion engine are provided for appropriately controlling the amounts of fuel supplied from an in-cylinder fuel injection valve and a port fuel injection valve to a cylinder in a simple control approach while satisfactorily reflecting a fuel transport behavior as a whole cylinder. An ECU calculates a required in-cylinder injection amount and a required port injection amount, calculates an in-cylinder injected fuel behavior parameter of a fuel from the in-cylinder fuel injection valve and a port injected fuel behavior parameter of the fuel from the port fuel injection valve, a net in-cylinder injection amount in accordance with the in-cylinder and port injected fuel behavior parameters based on the required in-cylinder injection amount, and a net port injection amount in accordance with the in-cylinder and port injected fuel behavior parameters based on the required port injection amount.

Abstract: An EGR control apparatus and method for an internal combustion engine which burns an air-fuel mixture with self ignition in addition to a flame propagation combustion, are provided for improving the combustion efficiency, engine output, drivability, and exhaust gas characteristics in an internal combustion engine which involves a self ignition combustion of an air-fuel mixture in addition to a flame propagation combustion.

Abstract: An internal EGR control device for an internal combustion engine, which is capable of properly controlling an internal EGR amount, while causing conditions of burned gases to be reflected thereon in controlling the internal EGR by changing valve-closing timing of an exhaust valve. An internal EGR control device sets a target internal EGR amount EGRINCMD as a target of the internal EGR amount according to detected operating conditions of an internal combustion engine, and a target internal EGR amount EGRINC is determined by correcting the target internal EGR amount based on a gas state equation, using obtained temperature and pressure of exhaust gases, and a calculated gas constant R. Then, according to the corrected target internal EGR amount EGRINC, the valve-closing timing of an exhaust valve is calculated, and a variable valve mechanism is controlled based on the calculated valve-closing timing of the exhaust valve.

Abstract: An internal EGR control device for an internal combustion engine, which is capable of properly controlling an internal EGR amount, while causing conditions of burned gases to be reflected thereon in controlling the internal EGR by changing valve-closing timing of an exhaust valve. An internal EGR control device sets a target internal EGR amount EGRINCMD as a target of the internal EGR amount according to detected operating conditions of an internal combustion engine, and a target internal EGR amount EGRINC is determined by correcting the target internal EGR amount based on a gas state equation, using obtained temperature and pressure of exhaust gases, and a calculated gas constant R. Then, according to the corrected target internal EGR amount EGRINC, the valve-closing timing of an exhaust valve is calculated, and a variable valve mechanism is controlled based on the calculated valve-closing timing of the exhaust valve.

Abstract: A fuel injection control apparatus and method for an internal combustion engine are provided for appropriately calculating fuel injection times for an in-cylinder fuel injection valve and a port fuel injection valve, thereby accurately controlling the amounts of fuel supplied to the internal combustion engine from the in-cylinder fuel injection valve and the port fuel injection valve, respectively. The fuel injection control apparatus calculates an in-cylinder fuel injection amount which should be injected by the in-cylinder fuel injection valve, and calculates an in-cylinder fuel injection time which is a valve opening time of the in-cylinder fuel injection valve in accordance with the calculated in-cylinder fuel injection amount and an acquired cylinder internal pressure.

Abstract: A control system for an internal combustion engine, which is capable of positively preventing a misfire or knocking during a compression ignition combustion mode by switching from the compression ignition combustion mode to a spark ignition combustion mode in appropriate timing. The engine is operated while switching between the compression ignition and spark ignition combustion modes. The control system (ECU) sets a target operating gas temperature to which the temperature of operating gases in a combustion chamber is to be controlled in the compression ignition combustion mode, sets a target internal EGR amount to which the internal EGR amount is to be controlled, such that the temperature of operating gases in the combustion chamber becomes equal to the target operating gas temperature, and switches the combustion mode to the spark ignition combustion mode depending on the target internal EGR amount.

Abstract: An EGR control apparatus and method for an internal combustion engine which burns an air-fuel mixture with self ignition in addition to a flame propagation combustion, are provided for improving the combustion efficiency, engine output, drivability, and exhaust gas characteristics in an internal combustion engine which involves a self ignition combustion of an air-fuel mixture in addition to a flame propagation combustion.

Abstract: A fuel injection control apparatus and method for an internal combustion engine are provided for appropriately calculating fuel injection times for an in-cylinder fuel injection valve and a port fuel injection valve, thereby accurately controlling the amounts of fuel supplied to the internal combustion engine from the in-cylinder fuel injection valve and the port fuel injection valve, respectively. The fuel injection control apparatus calculates an in-cylinder fuel injection amount which should be injected by the in-cylinder fuel injection valve, and calculates an in-cylinder fuel injection time which is a valve opening time of the in-cylinder fuel injection valve in accordance with the calculated in-cylinder fuel injection amount and an acquired cylinder internal pressure.

Abstract: A fuel injection control apparatus and method for an internal combustion engine are provided for appropriately controlling the amounts of fuel supplied from an in-cylinder fuel injection valve and a port fuel injection valve to a cylinder in a simple control approach while satisfactorily reflecting a fuel transport behavior as a whole cylinder. An ECU calculates a required in-cylinder injection amount and a required port injection amount, calculates an in-cylinder injected fuel behavior parameter of a fuel from the in-cylinder fuel injection valve and a port injected fuel behavior parameter of the fuel from the port fuel injection valve, a net in-cylinder injection amount in accordance with the in-cylinder and port injected fuel behavior parameters based on the required in-cylinder injection amount, and a net port injection amount in accordance with the in-cylinder and port injected fuel behavior parameters based on the required port injection amount.

Abstract: A control apparatus and method for an internal combustion engine are provided for ensuring a stable combustion state and improving the fuel efficiency when an air-fuel mixture is burnt with self ignition while auxiliarily using a spark ignition. The control apparatus for an internal combustion engine which is operated in a plurality of modes including a torch self ignition combustion mode comprises an ECU. In the torch self ignition combustion mode, the ECU controls an internal EGR amount, calculates an actual exhaust closing angle, calculates a target exhaust closing angle, calculates a closing angle deviation, calculates a fuel injection amount for forming a homogeneous air-fuel mixture, calculates a correction coefficient in accordance with the closing angle deviation, and corrects a basic value by the correction coefficient to calculate a fuel injection amount for forming a stratified air-fuel mixture.