| 摘要 |
Exhaust gas recirculation system including an intake pressure operated control valve for controlling the amount of exhaust gas recirculated to the intake system and a suction pressure adjusting valve of a duty factor solenoid type for determining the suction pressure applied to the control valve. A control circuit is provided for applying an operating signal to the pressure adjusting valve. The control circuit is associated with a memory device having memories of duty factors adapted to be applied to the pressure adjusting valve and corresponding to various combinations of engine speed and engine intake pressure. The memory device further includes memories on duty factors with which the control valve starts to open under various intake suction pressure, and memories on compensation factors under various engine temperatures so that the duty factors are modified under a cold engine temperature in accordance with the intake suction pressure and the engine temperature.
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