Patent ID: 6708106
Filing Date: 2004-03-16
Classification: F02D

Abstract:
A throttle valve opened amount calculator comprising:a valve sensor for detecting an opened amount of a throttle valve to generate a detection voltage; a memory connected to the valve sensor to store an initial zero point detection value, wherein the initial zero point detection value is the detection voltage output from the throttle valve sensor when the throttle valve is fully closed; and a calculation circuit connected to the valve sensor and the memory to obtain the difference between the detection voltage and the initial zero point detection value and to calculate the opened amount of the throttle valve with the difference, wherein, when a plurality of detection voltages that are less than the initial zero point detection value are generated, the calculation circuit calculates a new zero point detection value that is greater than a smallest one of the plurality of detection voltages by a predetermined value and updates the initial zero point detection value with the new zero point detection value.