Hydraulic control system in construction machine

Details Hydraulic control system in construction machine Hydraulic control system in construction machine

1998-04-24

1999-11-30

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60468, 60469, F16D 3102

Patent

active

059921471

ABSTRACT:
A hydraulic control system in a construction machine is provided with a hydraulic pump delivering hydraulic oil, a directional control valve controlling flow of the hydraulic oil, an actuator driven by the hydraulic oil outputted from the directional control valve, and a tank into which the hydraulic oil delivered from the hydraulic pump is bleeded. A cut-off valve controlling flow of the bleeded hydraulic oil is arranged between the directional control valve and the tank. Transient characteristics are added to a signal controlling the cut-off valve so that variation of the signal is suppressed to be small. Transient characteristics are added also to a signal controlling the hydraulic pump so that variation of the signal is suppressed to be small. Thereby the construction machine can travel smoothly.

REFERENCES:
patent: 3871178 (1975-03-01), Tominaga
patent: 5421155 (1995-06-01), Hirata et al.
patent: 5680760 (1997-10-01), Lunzman

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