Hydraulic power unit

Details Hydraulic power unit Hydraulic power unit

1992-07-20

1993-08-31

Bertsch, Richard A.

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

417 44, 417 63, 303DIG4, F04B 4908

Patent

active

052403793

ABSTRACT:
A hydraulic power unit for a vehicle comprises a motor, a pump to be driven by the motor to pump up an oil stored in an oil tank, a gas filling type accumulator connected to the pump, a pressure sensor disposed at a portion near an outlet port of the accumulator for detecting a pressure of the oil in the accumulator, a control unit operatively connected to the pressure sensor and a relay opertively connected to the control unit for controlling an operation of the motor. In the control unit, a rate of change of the pressure of the oil detected by the pressure sensor is calculated with respect to transition of time, an inflection point at which the rate of change of the oil pressure at a time of control start time or control stop time of the hydraulic power unit is maximumly changed is obtained, an oil pressure at the inflection point is calculated, the oil pressure at the inflection point is compared with a predetermined oil pressure, and a fact as to whether or not the oil pressure at the inflection point reaches the predetermined oil pressure is discriminated.

REFERENCES:
patent: 4357054 (1982-11-01), Leiber
patent: 4728156 (1988-01-01), Burgdorf et al.

Affiliated with

Also associated with

Rating

Hydraulic power unit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hydraulic power unit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic power unit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2294228