Motors: expansible chamber type – Working member position feedback to motive fluid control – With main valve position feedback to pilot valve
Reexamination Certificate
2007-08-07
2007-08-07
Lopez, F. Daniel (Department: 3745)
Motors: expansible chamber type
Working member position feedback to motive fluid control
With main valve position feedback to pilot valve
C091S433000
Reexamination Certificate
active
11103890
ABSTRACT:
Disclosed is a hydraulic control circuit and method thereof for reducing heat generation and energy losses caused by overload. The hydraulic control circuit of the present invention includes a control lever for generating a manipulated signal according to a manipulated variable; a control valve driven by a pilot signal pressure for controlling a flow of the pressurized fluid traveling from the hydraulic pump to the actuator; a displacement sensor for detecting a switching position of the control valve; a pump pressure sensor for detecting a pump pressure applied to the hydraulic pump; an electronic proportional valve for supplying a pilot signal pressure to the control valve; and a controller for receiving the manipulated signal, determining a pilot signal pressure, outputting a control signal to the electronic proportional valve, receiving signals from the displacement sensor and the pump pressure sensor and comparing the signals with pre-stored reference data, and outputting to the electronic proportional valve a stroke error correcting control signal for adjusting the switching position of the control valve.
REFERENCES:
patent: 6286412 (2001-09-01), Manring et al.
patent: 0 884 482 (1998-12-01), None
patent: 2 298 291 (1996-08-01), None
Ladas and Parry LLP
Lopez F. Daniel
Volvo Construction Equipment + Holding Sweden AB
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