Importance

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Abstract

A supercharging pressure control device for an internal combustion engine provided with a supercharger includes a first intake passage interposed between the engine and the supercharger, a second intake passage interposed between a throttle valve and the supercharger, a by-pass passage interposed between first and second passages for by-passing the supercharger, a supercharging pressure control valve interposed between first and second passage for controlling the opening and closing of the by-pass passage and a control valve interposed between the first intake passage and the supercharging pressure control valve for increasing the value of the positive pressure in accordance with the increase of the RPM of the engine and the opening degree of the throttle valve. A three-way electromagnetic valve is interposed between the second intake passage and the control valve for communicating the negative pressure generated in the second intake passage or the atmosphere with the control valve in accordance with the RPM of the opening degree of the throttle valve.

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First Claim