Patent ID: 6805094
Filing Date: 2004-10-19
Classification: F02D

Abstract:
An on-vehicle engine control apparatus including: a motor for carrying out an intake throttle valve opening control conforming to an output of one of a pair of accelerator position sensors that detects a degree of working an accelerator pedal and an output of one of a pair of throttle position sensors that detects said throttle valve opening; and an engine drive that includes at least one fuel injection solenoid valve;said on-vehicle engine control apparatus comprising: a load relay that feeds said motor with a power supply and returns said throttle valve opening to a predetermined position by interrupting said power supply; a first integrated circuit element that includes a microprocessor and generates a first control output for controlling a throttle valve to said motor and a second control output to said engine drive; a second integrated circuit element that is connected to said first integrated circuit element via a serial interface and generates a driving output to said load relay in cooperation with said microprocessor of said first integrated circuit element; first mutual diagnostic means that is incorporated in said first integrated circuit element and diagnoses whether or not there is any abnormality in operation of said second integrated circuit element; second mutual diagnostic means that is incorporated in said second integrated circuit element and diagnoses whether or not there is any abnormality in operation of said first integrated circuit element; and abnormality detection means that monitors operation of a sensor system, a control system, and an actuator system related to said throttle valve control at all times and generates an abnormality detection output at the time of occurring any abnormality; wherein operation of said load relay is preferably controlled conforming to a diagnostic result of the operation of said second integrated circuit element carried out by said first mutual diagnostic means, a diagnostic result of the operation of said first integrated circuit element carried out by the mentioned second mutual diagnostic means, and the output of the mentioned abnormality detection means.