To set a nozzle vane opening with high accuracy by detecting the actual operating position of the actuator of a nozzle vane which controls exhaust speed flowing into an exhaust turbine, and controlling driving of the actuator by a deviation to a targeted operating position set according to an engine condition.
At the time of running an engine, a control unit 25 refers to a stroke map 26 based on engine load 32 and engine speed 33 to select the targeted operating position of the actuator 10. The operation of respective solenoid valves 22-24 is controlled to drive the actuator 10 and control the opening of a nozzle vane which controls exhaust speed flowing into the exhaust turbine of a turbo unit. The actual operating position of the actuator is detected by a position sensor 18, and it is discriminated whether or not the actual operating position is within a prescribed tolerance to the targeted operating position. If it is discriminated as not acceptable, opening control is conducted again so as to be convergent within the tolerance.
TAKAHASHI TAKASHI
YAMAGUCHI NORITAKA
MITSUBISHI MOTORS CORP