Internal combustion engine control apparatus

Abstract

An object of this invention is to prevent a diaphragm of an actuator from being damaged by a high temperature, and improve a heat resistance property of the actuator. A valve actuator includes a communication hole that allows communication between a high pressure chamber and a low pressure chamber that are separated by a diaphragm, and a normally closed reed valve that opens and closes the communication hole. When a temperature of the valve actuator is less than a pressure release temperature, an ECU changes a differential pressure between the high pressure chamber and low pressure chamber by means of a pressure regulating valve, to control the valve actuator. This control is executed within a range of differential pressures at which the reed valve does not open. If the temperature exceeds the pressure release temperature, a differential pressure at which the reed valve opens is realized by the pressure regulating valve. Thus, pressure is released from the high pressure chamber to the low pressure chamber at a high temperature, and the diaphragm can be protected.

Dependencies are inferred from the claim text.