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:
Feb. 14, 1978
Filed:
May. 16, 1977
Minoru Nagase, Kobe, JA;
The Nippon Air Brake Company, Ltd., Kobe, JA;
Abstract
A load-weighed voltage corresponding to a pneumatic brake command signal is obtained from a pressure/electric transducer to control the electric brakes of a vehicle also equipped with friction brakes. An electrical feedback signal representing the electric brake effectiveness is compared to the transducer output signal to derive an error signal corresponding to the friction brake requirement necessary to supplement the electric brake sufficiently to satisfy the brake command. An electric-pneumatic transducer converts this error signal to a pneumatic signal which is connected to a first control chamber of a self-lapping type relay valve device whose delivery port is connected to the vehicle brake cylinders. A cut-off valve controls communication of the pneumatic brake command signal with a second control chamber of the relay valve to effect operation of the relay valve only in the event of a malfunction of the electrical circuit components performing the friction brake requirement function.