EXHAUST GAS RECIRCULATION SYSTEM FOR AN INTERNAL COMBUSTION ENGINE

摘要

The duty cycle of a driving pulse signal applied to an electromagnetic valve which controls the recirculation rate of the exhaust gas of an internal combustion engine, is compensated for by a compensation signal produced in accordance with the difference of the voltage of the power supply and a predetermined voltage so that the actual working period of the electromagnetic valve is adjusted optimally irrespectively of the deviation of the voltage of the power supply from the predetermined voltage, thereby providing the most suitable recirculation rate of the exhaust gas.