PURPOSE: To aim at the promotion of properness in an exhaust reflux quantity at the time of transient driving, by compensating the demand valve opening value of an exhaust reflux valve being stored according to plural driving parameter values at a time when an engine is in the transient driving state.
CONSTITUTION: At an electronic control unit 50, each output value out of an Ne sensor 11 and a PB sensor 10, and engine speed and absolute pressure data inside a suction pipe are read, while the demand valve opening value being stored in a read-only memory is read out of a valve lift map. Next, whether the engine is in its transient driving state or not is discriminated from a variation degree of the suction pipe inner absolute pressure. Here when it is in a decelerated driving state to the read demand valve opening value, the specified decrement value is subtracted, but when it is in an accelerated driving state, the specified increment value is added, and each value is set as a valve opening command value. And, the on-off duty ratio value of a solenoid three-way valve 25 is set according to a deviation between this valve opening command value and the actual valve opening value of an exhaust reflux valve 22 detected by a valve lift sensor 28.
ASAKURA MASAHIKO
KAWANABE TOMOHIKO
MUROYA MINORU
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