Patent ID: 6880537

Claim:
A control unit of internal combustion engine, provided with exhaust gas recirculation pipe, through which a part of exhaust gas returns to an intake pipe of the engine, and with an exhaust gas recirculation valve in the exhaust gas recirculation pipe, which adjusts the recirculation quantity of the exhaust gas in an intake gas, comprising: a cruise controller which controls the fuel injection value so that the driving state of a vehicle is a regular state; an exhaust gas recirculation regulator which controls the opening degree of the exhaust gas recirculation valve according to the fuel injection value, and decreases the opening degree of the exhaust gas recirculation valve quickly to the minimum when the increase of the fuel injection value in a unit time exceeds a criterial value; and an exhaust gas recirculation buffer that prevents the exhaust gas recirculation regulator from quick-decreasing the opening degree of the exhaust gas recirculation valve when the fuel injection value is wiggling by the operation of the cruise controller.