Patent ID: 6820604
Filing Date: 2004-11-23
Classification: F02D

Abstract:
A method of calculating an offset of a throttle-position sensor in an engine, the engine operable to run in an idle mode, the engine having an exhaust manifold and a fuel injection system, the fuel injection system including a control unit, a throttle valve, and at least one sensor providing an output, and operable to perform in a closed-loop mode, the method comprising:operating the engine in idle mode; operating the electronic fuel injection system in closed-loop mode; computing an expected angle of the throttle valve while operating the engine in idle mode; obtaining a first output from the at least one sensor while operating the engine in idle mode; determining an actual angle of the throttle valve using the output from the at least one sensor; determining an offset between the expected angle of the throttle valve and the actual angle of the throttle valve; and adding the offset to the actual angle of the throttle valve to generate a corrected angle of the throttle valve.