Control system for load sensing hydraulic drive circuit

Details Control system for load sensing hydraulic drive circuit Control system for load sensing hydraulic drive circuit

1991-06-18

1992-07-14

Look, Edward K.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60450, 60468, F16D 3102

Patent

active

051292300

ABSTRACT:
A load sensing hydraulic drive circuit comprises a variable displacement pump delivering fluid to a flow control valve for controlling flow to an actuator. A pump controller controls a delivery rate of the pump such that a differential pressure between a delivery pressure of the pump and a load pressure of the actuator is equal to a first predetermined value. An unloading valve is connected between the pump and the flow control valve for holding the differential pressure between the delivery pressure of the pump and the load pressure of the actuator less than a second predetermined value. A demanded flow rate of the flow control valve is detected and the unloader valve is controlled based on the demanded flow rate such that when the demanded flow rate is small, the second predetermined value is smaller than the first predetermined value, and when the demanded flow rate increases, the second predetermined value becomes larger than the first predetermined value. This allows stable control of the differential pressure for both large and small changes in operation of the flow control valve.

REFERENCES:
patent: 3976097 (1976-08-01), Brakel
patent: 4120233 (1978-10-01), Heiser
patent: 4468173 (1984-08-01), Dantlgraber
patent: 4523430 (1985-06-01), Masuda
patent: 4617854 (1986-10-01), Kropp
patent: 4738102 (1988-04-01), Kropp
patent: 4967557 (1990-11-01), Izumi et al.

Affiliated with

Also associated with

Rating

Control system for load sensing hydraulic drive circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Control system for load sensing hydraulic drive circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control system for load sensing hydraulic drive circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-328452