Sensor device with a self adjustor for eliminating abnormal sens

Details Sensor device with a self adjustor for eliminating abnormal sens Sensor device with a self adjustor for eliminating abnormal sens

1996-06-04

1999-10-12

McCall, Eric S.

Measuring and testing

Brake testing

Vehicle installation

701 70, G01L 528

Patent

active

059658070

ABSTRACT:
A brake hydraulic pressure detector includes a bridge circuit made up of a semiconductor sensor which generates a detection voltage in accordance with hydraulic pressure and resistors for setting the detection voltage during nonbraking to a nonzero predetermined voltage, an adder circuit for amplifying and generating the detection voltage from the bridge circuit by a predetermined gain, and an output circuit. Here, if the sensitivity of an output voltage with respect to the hydraulic pressure varies, i.e., if the gain varies for some reason, the output voltage during nonbraking also changes because the offset voltage is set to a nonzero voltage. Thus, abnormality in the sensitivity of the brake hydraulic pressure detector can be detected by monitoring the output voltage during nonbraking.

REFERENCES:
patent: 4020480 (1977-04-01), Gotley et al.
patent: 4158396 (1979-06-01), Suzuki et al.
patent: 4719796 (1988-01-01), Zenker
patent: 5398194 (1995-03-01), Brosh et al.
patent: 5473253 (1995-12-01), Araki
patent: 5631632 (1997-05-01), Nakashima et al.

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