Patent ID: 6935308

Claim:
An operation control device of a multi-cylinder engine comprising electronic throttle control means, fuel injection control means, and air/fuel ratio control means; wherein said electronic throttle control means includes motors each provided at an individual cylinder intake pipe to control a throttle valve opening, and a drive control circuit feeding an electric power to said motor includes a switching element of which ON/OFF is controlled by a microprocessor having a program memory and a data memory; said data memory contains a corrective characteristic parameter, and said program memory contains a program acting as means for setting a target throttle valve opening that can be obtained by adding a characteristic correction value or multiplying a characteristic correction coefficient with reference to a detection output from an accelerator position sensor detecting a depression degree of an accelerator pedal, and a program acting as motor control means; said corrective characteristic parameter is a statistical data that can be obtained by actually measuring preliminarily a relation between throttle valve openings of individual cylinders with which each individual cylinder air-intake becomes uniform in accordance with a detection output from an airflow sensor that is provided at an intake manifold located in upstream position of said individual cylinder intake pipe and an engine speed, and said corrective characteristic parameter acts as a characteristic parameter to compensate fluctuation in air intake resistance of an intake pipe; said characteristic correction value or characteristic correction coefficient is an addition/subtraction constant or a multiplication coefficient correcting a target throttle valve opening individually for each cylinder so as to control a throttle valve opening of each individual cylinder based on said corrective characteristic parameter; said motor control means is means for controlling ON/OFF of said switching element individually to cylinders so that a detection output from a throttle position sensor for each individual cylinder that detects a throttle valve opening becomes equal to said target throttle valve opening having been corrected individually for each cylinder; and a throttle valve opening of an individual cylinder intake pipe is electrically controlled in response to a depression degree of the accelerator pedal, and fuel injection is performed individually for each cylinder so as to be capable of obtaining a predetermined air/fuel ratio.