Abstract: A cylinder deactivation change apparatus including fuel supply parts supplying fuel into a first and second combustion chambers of a first and second cylinders, ignition parts igniting fuel-air mixture in the first and the second combustion chambers and a microprocessor. The microprocessor is configured to perform determining whether changing the operation mode is necessary, and controlling the fuel supply parts and ignition parts so as to ignite at first ignition timing before it is determined that changing the operation mode to the first mode is necessary, and so as to ignite at second ignition timing retarded in comparison with the first ignition timing and so as to supply the fuel into the first combustion chamber in a manner that causes a stratified charge combustion in the first combustion chamber, when it is determined that changing the operation mode to the first mode is necessary.

Abstract: A cylinder deactivation change apparatus including fuel supply parts supplying fuel into a first and second combustion chambers of a first and second cylinders, ignition parts igniting fuel-air mixture in the first and the second combustion chambers and a microprocessor. The microprocessor is configured to perform determining whether changing the operation mode is necessary, and controlling the fuel supply parts and ignition parts so as to ignite at first ignition timing before it is determined that changing the operation mode to the first mode is necessary, and so as to ignite at second ignition timing retarded in comparison with the first ignition timing and so as to supply the fuel into the first combustion chamber in a manner that causes a stratified charge combustion in the first combustion chamber, when it is determined that changing the operation mode to the first mode is necessary.

Abstract: A controller of an internal combustion engine retards the ignition timing by a soot suppression necessary retard amount IGCR as a retard amount for suppressing the soot generation amount in exhaust gas, from an optimal ignition timing IGMBT, according to a detected operation state, e.g., engine water temperature TW, charging efficiency ETAC, engine speed NE, of an internal combustion engine 3. A controller of an internal combustion engine of a second invention retards an ignition timing IGLOG to suppress the soot generation amount in exhaust gas, according to an operation state of the internal combustion engine 3, in a normally aspirated operation state where the charging efficiency ETAC is not higher than 100%, and in a turbocharged operation state.

Abstract: An intake control system for an internal combustion engine is capable of ensuring a differential pressure across an EGR valve, and controlling an EGR amount with high accuracy. A target fresh air amount is set based on a demanded torque calculated according to operating conditions of the engine. A differential pressure across an EGR valve is set as a target differential pressure. When it is determined that the across-valve differential pressure is not in a state in which the target differential pressure can be ensured, an opening degree of the EGR valve is controlled to limit an EGR amount. An opening degree of a throttle valve is controlled based on the target fresh air amount, so as to ensure the target differential pressure.

Abstract: An intake control system for an internal combustion engine is capable of ensuring a differential pressure across an EGR valve, and controlling an EGR amount with high accuracy. A target fresh air amount is set based on a demanded torque calculated according to operating conditions of the engine. A differential pressure across an EGR valve is set as a target differential pressure. When it is determined that the across-valve differential pressure is not in a state in which the target differential pressure can be ensured, an opening degree of the EGR valve is controlled to limit an EGR amount. An opening degree of a throttle valve is controlled based on the target fresh air amount, so as to ensure the target differential pressure.