Patent ID: 6408818
Filing Date: 2002-06-25
Classification: F02D

Abstract:
An intake air flow rate controlling device, comprising:a throttle valve located in an intake passage of a combustion engine; a motor that controls an intake air flow rate by controlling an opening degree of the throttle valve; a motor driving means for driving the motor; a throttle valve opening degree detecting sensor; a target opening degree setting means for outputting a target throttle valve opening degree as a target position signal to the motor driving means for setting the opening degree of the throttle valve; a throttle valve completely closing position learning means for learning a completely closed position of the throttle valve from a completely closed position signal from the throttle valve opening degree detecting sensor, and for outputting a corresponding closed position learning value; and a throttle valve completely closing position detecting and correcting means for detecting a stop of an operation of the combustion engine, for operating the throttle valve to be in a completely closed position, for detecting the completely closed position from the completely closed position signal from the throttle valve opening degree detecing sensor, and for correcting the target position signal, for a completely closed state, outputted from the target opening degree setting means by shifting the target position signal on a side of opening the throttle valve by a predetermined amount.