Control device for variable capacity pump

Details Control device for variable capacity pump Control device for variable capacity pump

1998-01-30

2000-01-04

Wolfe, Willis R.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

417218, 60449, F04B 4906

Patent

active

060103094

ABSTRACT:
A controller, for a variable capacity pump, prevents engine stalls due to rapid changes in operating load by increasing the pump absorption torque when the engine speed is high so as to increase the work amount and by reducing the pump absorption torque when the engine speed is low. The controller receives a signal from an engine speed sensor for detecting engine speed. A pump absorption torque curve is pre-set so as to be consecutively stepped with respect to engine speed so as to intersect at an engine rated point. The pump absorption torque is then calculated in accordance with increases or decreases in engine speed. The pump absorption torque is then set to prescribe values based on the results of these calculations and an instruction is outputted to a control valve in such a manner as to regulate a regulator of the variable capacity pump.

REFERENCES:
patent: 4332531 (1982-06-01), Marietta
patent: 4528813 (1985-07-01), Izumi et al.
patent: 4637781 (1987-01-01), Akiyama et al.
patent: 4809504 (1989-03-01), Izumi et al.
patent: 4823552 (1989-04-01), Ezell et al.
patent: 4904161 (1990-02-01), Kamide et al.
patent: 5468126 (1995-11-01), Lukich
patent: 5881629 (1999-03-01), Gollner et al.

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