Control device for variable displacement type turbo-charger

Abstract

Abstract PURPOSE:To aim at increasing the supercharged pressure, by providing such an arrangement that the passage area of an exhaust gas introduction passage led to a turbine is made variable with the use of a displacement changing means which is controlled in accordance with the rotational speed and load of the engine, and the above- mentioned passage area is narrowed to such a limit that no knocking occurs. CONSTITUTION:A movable reed part 42 is swingably disposed in an introduction passage section for the turbine scrol of a turbo-charger 25 so that the passage area of introduction exhaust gas is made variable. This movable reed 42 is rotated by a vacuum actuator 46 through a rod 44, etc. Further, the vacuum actuator 46 is controlled by a control pressure which is produced by a vacuum pump 54 and is regulated in accordance with the opening degree of a solenoid valve 56. This solenoid valve 56 controls the passage area of the introduction passage to narrow the latter to such a limit that no knocking occurs in accordance with a control signal which is obtained by compensating, in accordance with the output of a knock sensor 33, a basic control value which is set in the control unit 29 in accordance with the outputs of an air-flowmeter 24 and a crank angle sensor 32.

Inventors

• 👤 Yuji Hirabayashi
• 👤 平林　雄二

Bibliographic Details