The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 1989
Filed:
Aug. 10, 1987
Aisin-Warner Kabushiki Kaisha, Anjo, JP;
Abstract
In accordance with the invention, the mounting position of a throttle opening sensor is adjusted in such a manner that the output voltage of the sensor attains a value a value of V.sub.100 at a throttle opening of 100%. When execution of the system program starts, V.sub.0 is stored in memory as initialized voltage data at a throttle opening of 0%. A throttle opening .theta..alpha. corresponding to sensed voltage data V.alpha. is calculated in an arithmetic unit in accordance with the following equation: ##EQU1## The throttle opening - output voltage characteristic may change due to an error in mounting the throttle opening sensor, a change in the length of the throttle cable caused by a temperature variation, or a change in resistance value caused by aging. If such is the case and a voltage V'.sub.0 greater than the previously stored voltage V.sub.O prevailing at the throttle opening of 0% is sensed, then V'.sub.0 is stored in memory as new voltage data corresponding to the throttle opening of 0%. Thereafter, a throttle opening .theta.'.alpha. corresponding to sensed voltage data V'.alpha. is calculated in accordance with Eq. (1). Therefore, since an adjustment is made so as to absorb any variance in the throttle opening - output voltage characteristic of the throttle opening sensor, an accurate throttle signal can be obtained at all times despite a change in the characteristic of the throttle opening sensor when the sensor is mounted or due aging.