Electric pump control system

Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor

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Details

417 17, F04B 4906

Patent

active

056581319

ABSTRACT:
An electric pump is turned ON and OFF by a main drive circuit including a negative pressure sensor for detecting a negative pressure in an accumulator, a first relay and a control device, and also turned ON and OFF by a back-up drive circuit including a negative pressure switch for detecting a negative pressure in an accumulator, and a second relay. For a period from the starting of the electric pump by the back-up drive circuit to the stopping of the electric pump by the main drive circuit, there is a period during which the electric pump is being driven only by the back-up drive circuit and a period during which the electric pump is being driven only by the main drive circuit. For each of these periods, a trouble of the main drive circuit and/or the back-up drive circuit can be determined by reference to a check signal indicative of the operational state of the electric pump. Thus, it is possible to reliably detect a trouble with the driving of the electric pump connected to the accumulator.

REFERENCES:
patent: 4525125 (1985-06-01), Matsumoto et al.
patent: 5317870 (1994-06-01), Inagawa
patent: 5364173 (1994-11-01), Wada et al.
patent: 5369349 (1994-11-01), Tsuchiya et al.
patent: 5373454 (1994-12-01), Kanda et al.
patent: 5413404 (1995-05-01), Inagawa

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