Fault diagnostic apparatus for a hydraulic pressure source

Details Fault diagnostic apparatus for a hydraulic pressure source Fault diagnostic apparatus for a hydraulic pressure source

1990-12-06

1991-12-24

Myracle, Jerry W.

Measuring and testing

Simulating operating condition

Marine

340453, G01M 1900

Patent

active

050741454

ABSTRACT:
An apparatus for diagnosing a fault of a hydraulic pressure source, including a fluid tank, a pump for pumping up fluid from the fluid tank, an accumulator for accumulating the fluid pumped up by the pump, a pressure detector for detecting a pressure of the fluid in the accumulator and generating an output signal, a pump drive or motor responsive to the output signal for driving the pump, and an electromagnetic valve of normally closed type interposed either in a flow path between the accumulator and a hydraulic pressure instrument or in a flow path between the tank and the hydraulic pressure instrument. This apparatus comprises an excitation signal generator for generating an excitation signal which excites the electromagnetic valve for a predetermined period of time, and a control unit for determing an anomaly on the basis of the output signal from the pressure detector. If any fault exists in the hydraulic pressure source, fall and rise of the hydraulic pressure is not effected normally. The control unit determines whether the variation of the hydraulic pressure is normal or abnormal on the basis of the output signal from the pressure detector.

REFERENCES:
patent: 4520663 (1985-06-01), Moore et al.
patent: 4979391 (1990-12-01), Drake et al.

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