EXHAUST GAS RECIRCULATOR

摘要

An electronic control unit (31) comprises a duty conversion map (41) for finding a variable corresponding to the target amount of exhaust gas to be fed back, for example, the drive duty of an electromagnetic vacuum control valve (12) of when a not-shown electromagnetic coil is driven by electrification for the desired magnitude of a negative pressure at a negative pressure output port (not shown) of the electromagnetic vacuum control valve (12) and a duty correction map (42) for finding a correction value of the drive duty from an inputted battery voltage and engine cooling water temperature. Correction is made by multiplying the drive duty by the correction value shown in the duty correction map (42). The electromagnetic vacuum control valve (12) is electrified by a drive circuit (26) according to the corrected drive duty.