Patent ID: 7121258

Claim:
An electronic throttle control device comprising a drive control circuit section of a motor that drives to open and close intake throttle valves of a multi-cylinder engine by a microprocessor cooperating with a program memory; wherein said intake throttle valves and throttle valve opening control motors are disposed at plural places separately for each cylinder or each cylinder group; said program memory contains a program acting as target throttle valve opening setting means, a program acting as sequential control means, and a program acting as holding throttle valve opening storage means; said drive control circuit section is provided with a feedback control circuit section acting with functions separated; said target throttle valve opening setting means is means for setting a target throttle valve opening separately for each cylinder or each cylinder group, the target throttle valve opening being obtained by adding or subtracting a compensation output generated conforming to operating conditions on the basis of detection outputs of acceleration position sensors, that detect a degree of stepping on an accelerator pedal; said sequential control means is means for making available only an adjustment and control of the valve opening of the intake throttle valve for a cylinder remaining a predetermined time period immediately before an intake stroke, in response to a crank angle sensor that detects a turning angle position of a crankshaft; said holding throttle valve opening storage means is means for storing a current target value varying in accordance with said target throttle valve opening when the control of throttle valve opening is available by said sequential control means, and storing and holding a value of the target throttle valve opening at the moment immediately before making the control unavailable to establish a holding throttle valve opening when the control of throttle valve opening is made unavailable; and said feedback control circuit section is a control circuit section for on/off-control of switching elements disposed on a power supply circuit of each of said motors so that a detection output of the throttle position sensors detecting a throttle valve opening is equal to said target throttle valve opening or said holding throttle valve opening; and the valve opening control for the plural motors is sequentially executed.