Tandem master cylinder with electromagnetic position sensors for

Details Tandem master cylinder with electromagnetic position sensors for Tandem master cylinder with electromagnetic position sensors for

1988-04-04

1990-04-10

Garrett, Robert E.

Power plants

Pressure fluid source and motor

Pulsator

60535, 60562, 92 5R, 32420720, B60T 1722

Patent

active

049149164

ABSTRACT:
A brake failure warning system for a dual hydraulic master cylinder for use with a motor vehicle. The warning system employs a pair of Hall Effect magnetic sensors which are positioned on the exterior of a plastic cylinder in association with the two pistons mounted within the bore of the cylinder. The pistons have ferrous frustoconical portions which coact with the respective sensors to generate position signals that vary as the pistons move in the bore past the respective sensors. The two position signals are fed to a logic board which compares the signals and generates an error or warning signal in the event that the difference between the two signals exceeds a predetermined amount indicative of failure of one of the two braking systems of the vehicle.

REFERENCES:
patent: 3112464 (1963-11-01), Ratajski et al.
patent: 3411133 (1968-11-01), Gardner
patent: 3412557 (1968-11-01), Williams
patent: 3448579 (1969-06-01), Reznicek
patent: 3529171 (1970-09-01), Hultgren et al.
patent: 3635024 (1972-01-01), Graham
patent: 3686864 (1972-08-01), Shutt
patent: 4143514 (1979-03-01), Leiber
patent: 4176586 (1979-12-01), Stoll et al.
patent: 4526003 (1985-07-01), Leiber
patent: 4776643 (1988-10-01), Leiber

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