Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1995-11-16
1997-05-20
Nguyen, Hoang
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
60468, 60494, F16D 3102
Patent
active
056303165
ABSTRACT:
In a hydraulic driving apparatus with a bladder-type accumulator connected to a fluid supply pipe extending from a hydraulic fluid source to at least one actuator, the apparatus comprises a hydraulic pressure sensor attached to the fluid supply pipe in the vicinity of the bladder-type accumulator and a control unit responsive to a detected pressure detected by the hydraulic pressure sensor for controlling the hydraulic fluid source. The control unit carries out the steps of judging, at the start of the hydraulic driving apparatus, an initial gas pressure supplied to the bladder-type accumulator with reference to a gradient of variation of the detected pressure detected by the hydraulic pressure sensor; monitoring, during a normal operation of the hydraulic driving apparatus, a difference .DELTA.P between the initial gas pressure and the detected pressure; and judging occurrence of a trouble when the difference .DELTA.P becomes smaller than a predetermined first difference .DELTA.P1 or when the difference .DELTA.P becomes greater than a predetermined second difference .DELTA.P2 (.DELTA.P1<.DELTA.P2).
REFERENCES:
patent: 3964260 (1976-06-01), Williams et al.
patent: 4202174 (1980-05-01), Grigorenko et al.
patent: 5034892 (1991-07-01), Saotome
patent: 5301505 (1994-04-01), Wright
Itsuji Yoshiyasu
Terada Shinji
Nguyen Hoang
Sumitomo Heavy Industrie's, Ltd.
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