Hydraulic control system for construction machines

Details Hydraulic control system for construction machines Hydraulic control system for construction machines

1994-12-01

1996-01-02

Look, Edward K.

Power plants

Pressure fluid source and motor

Condition responsive control of or by input to input pump...

60468, 60494, 417 34, F16D 3102, F04B 4900

Patent

active

054797780

ABSTRACT:
When the pump pressure detected through a pressure detecting line 48 is raised higher than a first predetermined pressure Pd1, a recovery switching valve 44 is shifted to a valve-closed position to cease the recovery function. At this time, the pump delivery pressure detected through a pressure detecting line 51 is higher than a second predetermined pressure Pd1* close to the first predetermined pressure Pd1, and an engine speed increasing device 52 controls an engine controller 11 to increase the rotational speed of an engine 10, thereby increasing the pump delivery rate. Thus, it is possible to make small speed change of an actuator and to increase working efficiency with no deterioration in operability, even when a recovery function is ceased.

REFERENCES:
patent: 4596118 (1986-06-01), Heiser
patent: 4610193 (1986-09-01), Barker et al.
patent: 4685295 (1987-08-01), Christiansen et al.
patent: 4864994 (1989-09-01), Myers
patent: 4942737 (1990-09-01), Tatsumi
patent: 5183071 (1993-02-01), Ogawa
patent: 5211196 (1993-05-01), Schwelm
patent: 5226348 (1993-07-01), Dezelan et al.
patent: 5259293 (1993-11-01), Brunner

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