Brake fuse warning circuit

Details Brake fuse warning circuit Brake fuse warning circuit

1979-10-10

1981-09-15

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

Specific condition

340 52B, 188 111, B60T 1722

Patent

active

042900603

ABSTRACT:
A warning circuit generates warning signals in response to a blown fuse in a vehicle brake system which includes primary and ignition-switch controlled. The back-up pump is driven by an electric motor. Control circuitry monitors and controls the brake system and the fuse protects the control circuitry from ground fault conditions. The warning circuit includes a warning lamp which is connected to the battery via the ignition switch and which is grounded through a transistor switch. The transistor switch is resistively coupled to ground and to the vehicle battery through the fuse so that the transistor switch becomes conducting to actuate the lamp upon the blowing of the fuse. Alternatively, a similar transistor switch may be connected to the output of an astable multivibrator, which in turn is connected to the battery via the fuse and whose output is inhibited unless the fuse blows while the ignition switch is closed.

REFERENCES:
patent: 3828308 (1974-08-01), Kobayashi
patent: 4025781 (1977-05-01), Brearley

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