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:
Apr. 03, 1990
Filed:
Jan. 31, 1989
Seiichi Ishizeki, Tokyo, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A set of wheel speed sensors forming parts of an anti-lock brake control system are tested for proper connection and operation when mounted on a motor vehicle. A check signal is first input to a sensor check terminal connected to a control circuit included in the brake control system, thereby causing the control circuit to light a warning lamp. Then the wheels of the vehicle are successively rotated in a predefined sequence and at a speed corresponding to the lowest vehicle speed at which the brake control system must be active. If all the wheel speed sensors deliver there outputs to the control circuit in the predetermined sequence, the warning lamp goes out to indicate proper functioning and proper connection of the sensors. The warning lamp remains illuminated if one or more of the wheel speed signals are not into to the control circuit or if the wheel speed signals are received by the control circuit in other than the predetermined sequence.