| 摘要 |
A control system comprising a flow control valve provided in an exhaust gas recirculation passage, an electromechanical valve-actuator for actuating the flow control valve and a control circuit including function generators and an adder, optionally combined with a multiplier, for producing a control signal to operate the valve-actuator. Each function generator receives a signal representing one of several variables related to the operational condition of the engine, e.g. the opening degree of the throttle valve and engine temperature, and produces an output signal indicating and corresponding to a desirable opening degree of the flow control valve based on the assigned variable. The output signals of the function generators are respectively modulated in amplitude according to the respective importance of the variables to the exhaust recirculation control and then combined together by the adder.
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