THROTTLE OPENING ESTIMATION METHOD AND ECU (ELECTRONIC CONTROL UNIT)

摘要

The vertical axis represents intake pipe pressure in an intake pipe (101), and the horizontal axis, time (or engine stroke). An amount of air leaking and incoming form a throttle valve (102) varies depending on an extent of opening of the throttle valve (102). An intake pipe pressure is measured at one point where a crank angle (crank cycle) of a crank or an engine stroke is synchronous with the measurement, and opening of the throttle valve (102) is estimated based on the intake pipe pressure measured. Thus throttle opening can be obtained without TPS (Throttle Position Sensor). Further, a value obtained by TPS can be corrected to a more accurate value. <IMAGE>