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:
Jan. 27, 1987
Filed:
Apr. 08, 1985
Asaji Imanaka, Kobe, JP;
Nippon Air Brake Co., Ltd., Kobe, JP;
Abstract
A railway vehicle brake control system in which a fluid pressure brake continuously supplements the electric brake as the electric brake effectiveness fades during vehicle slowdown. An amplifier circuit output signal corresponding to the electric brake effectiveness is modified by adjusting the amplifier gain in response to a detector sensing the initial drop in the electric brake effectiveness. This modified amplifer output signal is subtracted from a brake command signal to obtain a difference signal, the value of which establishes the amount of fluid pressure braking necessary to supplement the electric brake deficiency. The arrangement compensates for hysteresis and response delay in the pneumatic valving required in the fluid pressure brake system, such that the total brake obtained corresponds substantially to the brake command both during and following transition from the electric brake to the fluid pressure brake.