초록 ▼

In an engine exhaust catalyst warm-up control, an ignition timing is delayed than normal first to raise the catalyst temperature, and then a fuel injection amount is dithered to increase and decrease alternately from a normal amount until the catalyst temperature reaches the catalyst activation comp

In an engine exhaust catalyst warm-up control, an ignition timing is delayed than normal first to raise the catalyst temperature, and then a fuel injection amount is dithered to increase and decrease alternately from a normal amount until the catalyst temperature reaches the catalyst activation completion temperature. In place of the ignition delay control, afterburning control may be employed in which fuel cut for a cylinder and fuel increase for the other cylinders are executed. Further, the catalyst warm-up control may be performed by controlling a supercharging operation and an exhaust gas recirculation operation cooperatively.

대표청구항 ▼

[ What is claimed is:] [1.] A catalyst warm-up system for an internal combustion engine, comprising:an exhaust gas purifying catalyst disposed in an exhaust system;an exhaust gas recirculation passage for recirculating an exhaust gas partially from upstream of said catalyst to an intake system;an ex

[ What is claimed is:] [1.] A catalyst warm-up system for an internal combustion engine, comprising:an exhaust gas purifying catalyst disposed in an exhaust system;an exhaust gas recirculation passage for recirculating an exhaust gas partially from upstream of said catalyst to an intake system;an exhaust gas recirculation control valve for regulating an amount of the exhaust gas to flow via said exhaust gas recirculation passage;a supercharger disposed in said intake system;supercharger control means for controlling a drive/stop of said supercharger by deciding whether a running state of said internal combustion engine is in a supercharge region;catalyst warm-up decision means for deciding the warm-up degree of said catalyst; andcatalyst warm-up means for opening said exhaust gas recirculation control valve during the drive of said supercharger, if it is decided by said catalyst warm-up decision means that said catalyst is in an unwarmed-up state, to supply the supecharged air partially into the exhaust system via said exhaust gas recirculating passage and for controlling the amount of the fuel injection into said internal combustion engine to a rich side.