公开(公告)号：JPH02179296A

公开(公告)日：1990-07-12

申请号：JP27697989

申请日：1989-10-24

Applicant: MARELLI AUTRONICA

Inventor： MARUKO KARUFUSU ,  RUCHIAANO PAUTATSUSO

IPC: F02D41/20 ,  F02D11/10 ,  H02P7/29 ,  H02P8/22

Abstract: PURPOSE: To surely control a throttle valve at a predetermined static position at the time of idling by using a square wave signal having variable duty cycle as a signal for driving a DC motor, and forward or reversely rotating the motor according to change of the cycle. CONSTITUTION: A static position of a throttle valve B with respect to an idling speed is controlled by a DC motor M, which is driven by a controller C. A square wave signal S, output from an electronic control unit ECU, is supplied to an input unit (i) of the controller C. The cycle of the signal S is variable, and a code indicating amplitude and direction of change from its 50% designates the amplitude and direction of desired rotating speed of the motor M. The unit ECU receives a signal from a position sensor P, coupled to the valve B. A driver E flows a current in one direction or reverse direction with respect to the motor M, when the signal to be supplied is a high or low level.