Control system of internal combustion engine

A control system for controlling an internal combustion engine with an exhaust system provided with a catalyst, comprising

• a fuel cut means for executing a fuel cut stopping the supply of fuel to said internal combustion engine when the vehicle in which said internal combustion engine is mounted is in a decelerating state,
• the control system of internal combustion engine characterized in that, in the case that said fuel cut is executed, when the speed of said vehicle is higher than a predetermined first vehicle speed, the intake air amount of said internal combustion engine is made smaller than the intake air amount of when said internal combustion engine is in the idling state, while when the speed of said vehicle is said first vehicle speed or less and higher than a predetermined second vehicle speed lower than said first vehicle speed, the intake air amount of said internal combustion engine is made larger than the intake air amount of when said internal combustion engine is in the idling state.

A control system for controlling an internal combustion engine with an exhaust system provided with a catalyst, comprising

• a fuel cut means for executing a fuel cut stopping the supply of fuel to said internal combustion engine when a vehicle in which said internal combustion engine is mounted is in a decelerating state,
• said control system of internal combustion engine characterized in that, in the case that said fuel cut is executed, when the speed of said vehicle is a predetermined first vehicle speed or less, the amount of air flowing through said catalyst is increased compared with when the speed of said vehicle is higher than said first vehicle speed.

A control system for controlling an internal combustion engine with an exhaust system provided with a catalyst, comprising

• a fuel cut means for executing a fuel cut stopping the supply of fuel to said internal combustion engine when a vehicle in which said internal combustion engine is mounted is in a decelerating state,
• said control system of internal combustion engine characterized in that, in the case that said fuel cut is executed, when the speed of said vehicle is higher than a predetermined first vehicle speed, the opening degree of the throttle valve is made smaller than the opening degree of when said internal combustion engine is in the idling state, while when the speed of said vehicle is said first vehicle speed or less, the opening degree of the throttle valve is made larger than the opening degree of when said internal combustion engine is in the idling state.

A control system for controlling an internal combustion engine with an exhaust system provided with a catalyst, comprising

• a fuel cut means for executing a fuel cut stopping the supply of fuel to said internal combustion engine when the vehicle in which said internal combustion engine is mounted is in a decelerating state,
• the control system of an internal combustion engine characterized in that, in the case that said fuel cut is executed, when the speed of said vehicle is a predetermined first vehicle speed or less and is higher than a predetermined second vehicle speed lower than said first vehicle speed, the amount of air flowing through said catalyst is increased compared with when the speed of said vehicle is higher than said first vehicle speed.

A control system for controlling an internal combustion engine with an exhaust system provided with a catalyst, comprising

• a fuel cut means for executing a fuel cut stopping the supply of fuel to said internal combustion engine when the vehicle in which said internal combustion engine is mounted is in a decelerating state,
• the control system of an internal combustion engine characterized in that, in the case that said fuel cut is executed, when the speed of said vehicle is higher than a predetermined first vehicle speed, the opening degree of the throttle valve is made smaller than the opening degree of when said internal combustion engine is in the idling state, while when the speed of said vehicle is said first vehicle speed or less and higher than a predetermined second vehicle speed lower than said first vehicle speed, the opening degree of the throttle valve is made larger than the opening degree of when said internal combustion engine is in the idling state.

A control system for controlling an internal combustion engine with an exhaust system provided with a catalyst, comprising

• a fuel cut means for executing a fuel cut stopping the supply of fuel to the internal combustion engine when a vehicle in which said internal combustion engine is mounted is in a decelerating state,
• the control system of internal combustion engine characterized in that, in the case that said fuel cut is executed, the higher the speed of said vehicle, the smaller the intake air amount of said internal combustion engine.