Control device for cylinder injection type internal-combustion engine

Claim 2

A control device for a cylinder injection type internal-combustion engine, comprising: an intake sensor for detecting the amount of air drawn into an internal-combustion engine: a crank angle sensor for detecting a crank angle of said internal-combustion engine: fuel controlling means for computing the amount of fuel to be supplied to said internal-combustion engine according to respective detection results of at least said intake sensor and said crank angle sensor so as to set an air-fuel ratio for lean burning and for directly supplying a computed amount of fuel to a cylinder or said internal-combustion engine when said internal-combustion engine is in a compression stroke: exhaust gas recirculating control means for recirculating exhaust gas to an inlet of said internal-combustion engine; combustion state detecting means for detecting a deterioration of combustion of said internal-combustion engine: and retraining means for gradually changing at least one parameter among the amount of gas to be recirculated, ignition timing, and air-fuel ratio so as to restrain the deterioration of combustion of said internal-combustion engine when said combustion state detecting means has detected the deterioration of combustion of said internal-combustion engine: wherein said restraining means controls at least ignition timing or air-fuel ratio, and also reduces the amount of exhaust gas to be recirculated when the deterioration of combustion is not improved: wherein said restraining means changes fuel injection timing from a compression stroke to a suction stroke when reducing the amount of exhaust gas to be recirculated has failed to improve the deterioration of combustion.

Claim 3

A control device for a cylinder injection type internal-combustion engine, comprising: an intake sensor for detecting the amount of air drawn into an internal-combustion engine; a crank angle sensor for detecting a crank angle of said internal-combustion engine: fuel controlling means for computing the amount of fuel to be supplied to said internal-combustion engine according to respective detection results of at least said intake sensor and said crank angle sensor so as to set an air-fuel ratio for lean burning and for directly supplying a computed amount of fuel to a cylinder or said internal-combustion engine when said internal-combustion engine is in a compression stroke: exhaust gas recirculating control means for recirculating exhaust gas to an inlet of said internal-combustion engine: combustion state detecting means for detecting a deterioration of combustion of said internal-combustion engine: and retraining means for gradually changing at least one parameter among the amount of gas to be recirculated, ignition timing, and air-fuel ratio so as to restrain the deterioration of combustion of said internal-combustion engine when said combustion state detecting means has detected the deterioration of combustion of said internal-combustion engine: wherein said restraining means controls at least ignition timing or air-fuel ratio, and also reduces the amount of exhaust gas to be recirculated when the deterioration of combustion is not improved: wherein said restraining means changes fuel injection timing from a compression stroke to a suction stroke when reducing the amount of exhaust gas to be recirculated has failed to improve the deterioration of combustion: wherein said restraining means adjusts the air-fuel ratio to the vicinity of a stoichiometric air-fuel ratio to enrich a mixture when changing the fuel injection timing has failed to improve the deterioration of combustion.

Claim 4

A control device for a cylinder injection type internal-combustion engine, comprising: an intake sensor for detecting the amount of air drawn into an internal-combustion engine; a crank angle sensor for detecting a crank angle of said internal-combustion engine: fuel controlling means for computing the amount of fuel to be supplied to said internal-combustion engine according to respective detection results of at least said intake sensor and said crank angle sensor so as to set an air-fuel ratio for lean burning and for directly supplying a computed amount of fuel to a cylinder or said internal-combustion engine when said internal-combustion engine is in a compression stroke: exhaust gas recirculating control means for recirculating exhaust gas to an inlet of said internal-combustion engine: combustion state detecting means for detecting a deterioration of combustion of said internal-combustion engine: and retraining means for gradually changing at least one parameter among the amount of gas to be recirculated, ignition timing, and air-fuel ratio so as to restrain the deterioration of combustion of said internal-combustion engine when said combustion state detecting means has detected the deterioration of combustion of said internal-combustion engine: wherein said restraining means controls at least ignition timing or air-fuel ratio, and also reduces the amount of exhaust gas to be recirculated when the deterioration of combustion is not improved: wherein said restraining means changes fuel injection timing from a compression stroke to a suction stroke when reducing the amount of exhaust gas to be recirculated has failed to improve the deterioration of combustion: wherein said restraining means adjusts the air-fuel ratio to the vicinity of a stoichiometric air-fuel ratio to enrich a mixture when changing the fuel injection timing has failed to improve the deterioration of combustion.

Claim 5

A control device for a cylinder injection type internal-combustion engine according to claim 1, wherein said restraining means controls the deterioration of combustion for each cylinder wherein the combustion has deteriorated.