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:
May. 30, 1989
Filed:
Mar. 18, 1988
Nippon Seiko Kabushiki Kaisha, Tokyo, JP;
Abstract
A neutral condition discriminating circuit is connected to a steering torque detector and it discriminates whether a torque detection value of the steering torque detector is in a neutral condition or not, that is, whether it is substantially zero or not. When it is discriminated that the non-neutral condition of the torque detection value continues for a predetermined time, a motor output decreasing circuit decreases a current supplied to a motor which produces a steering assisting torque in accordance with the torque detection value. The hysteresis characteristic of the steering torque detector, which causes the non-neutral condition to occur even when the steering wheel is not steered, can be compensated for by reducing the steering assisting torque produced by the rotor.