G - Physics – 08 – B
Patent
G - Physics
08
B
340/77
G08B 29/00 (2006.01) B60T 17/22 (2006.01)
Patent
CA 1152177
BRAKE SYSTEM WARNING CIRCUIT ABSTRACT OF THE DISCLOSURE A warning circuit which generates signals in response to selected conditions of a vehicle hydraulic brake system. The brake system includes an engine-driven main source of hydraulic pressure, a relay-actuated auxiliary source of hydraulic pressure, a flow sensor for sensing the operation of the main source and a brake switch for coupling the auxiliary source with the battery in response to an operator brake application. The warning circuit includes a first transistor switch coupled with a warning lamp, with the ignition switch and with the auxiliary source. A second transistor switch is coupled to the ignition switch, to the auxiliary relay, to the flow sensor and to the first transistor switch. A third transistor switch is coupled to the ignition switch, to the flow sensor and to the first transistor switch. The system actuates the auxiliary source upon fail- ure of the main source during an operator brake application. The warn- ing circuit generates a warning signal when the ignition switch is on during failure of the primary source independent of the application of the brakes and independent of the existence of an open circuit con- dition in the auxiliary source. A warning signal is also generated in response to electrical open circuit conditions indicating failures of the various sensing components of the brake system.
353032
Bendix Corporation (the)
Macrae & Co.
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