Fluid pressure source apparatus

Details Fluid pressure source apparatus Fluid pressure source apparatus

1997-11-20

2000-08-29

Thorpe, Timothy S.

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

417 441, 303 10, 30312212, 30312213, 303DIG11, F04B 4902

Patent

active

061098795

ABSTRACT:
A fluid pressure source apparatus includes a pump, an accumulator for receiving pressure from the pump, a pressure switch for detecting the pressure in the accumulator, an electric motor for driving the pump, and a motor control device for driving the motor when the pressure switch detects a low pressure. A current detecting device detects a motor current value of the motor and a control unit determines whether the accumulator or the motor is experiencing an abnormality based on the motor current value. The control unit determines whether the motor current value occurring during a first set time following the start of driving of the motor is greater than a first set value. If the motor current value is not greater than the first set value, the control unit determines that the current detecting device is experiencing an abnormality. If there is no such abnormality information, the control unit compares the motor current value with predetermined values. If the motor current value continues to be less than a lower limit value for at least a predetermined length of time, the control unit determines that there is a low pressure abnormality. If the motor current value continues to be greater than an upper limit value for at least a predetermined length of time, the control unit determines that there is a motor lock abnormality.

REFERENCES:
patent: 5927832 (1999-07-01), Fulks et al.
patent: 5934880 (1999-08-01), Yamada et al.
patent: 5957549 (1999-09-01), Nagai et al.

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