SUPERCHARGER CONTROL DEVICE

PURPOSE:To provide always appropriate supercharged pressure, by detecting variations in the displacement of an actuator in a waste gate valve provided to bypass a supercharger turbine, and as well by controlling the amount of supercharged air which drives the actuator, in accordance with the variations. CONSTITUTION:A positional sensor 17 is disposed in the upper section of an acutuator 10 for opening and closing a waste gate (not shown) by means of a drive rod 14. This positional sensor 17 comprises a brush bed 18 provided to the top of a pin 18a which is integrally incorporated with a diaphragm 12 in the acutuator 10, and a resistor 20 on which a brush 19 on this brush bed 18 slides, thereby, in accordance with a resistance determined by the slide position of the brush 19 with respect to the resistor 20, the displacement amount of the actuator 10 is detected by means of a computer unit 27. Further, supercharged pressure is introduced into a diaphragm chamber 11 in the actuator 10 from passages 25, 26 by means of a solenoid valve 23, and the opening degree of the solenoid valve 23 is controlled in accordance with the above-mentioned displacement amount.