CONTROL SYSTEM FOR INTERNAL COMBUSTION ENGINE

摘要

There is provided a control system for an internal combustion engine, which is capable of properly controlling the amount of exhaust gas recirculation according to a degree of flow rate degradation of an exhaust gas recirculation system and at the same time suppressing progress of the flow rate degradation. The control system has an exhaust gas recirculation system including an exhaust gas recirculation passage for communicating between an exhaust passage and an intake passage, and an exhaust gas recirculation valve for controlling the rate of exhaust gas recirculation to the intake passage via the exhaust gas recirculation passage according to the operation amount of the valve. An ECU cuts off supply of fuel to the engine during deceleration of the engine. An intake pipe absolute pressure sensor detects pressure within the intake passage. Further, the ECU sets an upper limit of the operation amount of the exhaust gas recirculation valve according to a change in the pressure within the intake passage detected when the exhaust gas recirculation valve is opened and closed during the cut-off of fuel supply.