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:
Dec. 26, 1978
Filed:
Aug. 12, 1977
John P Bayliss, Redditch, GB;
Girling Limited, Birmingham, GB;
Abstract
A vehicle braking system employs a fluid pressure operated device for engaging the brakes. Flow of liquid under pressure to this device is controlled by a solenoid inlet valve and escape of fluid is controlled by a solenoid outlet valve both of which are normally closed. A demand signal and a feedback signal representing the degree to which brake operation has been achieved are fed to a comparator circuit and the valves are energized in accordance with the sign of the error signal. Operation of the respective means for controlling the operation of the respective valves is obtained by a pulse train generator, and a pair of pulse width modulating means, connected to the respective valves for modifying the mark-space ratio of the pulse train.