Fluid-pressure and analogous brake systems – Speed-controlled – Odd condition or device detection
Reexamination Certificate
2007-01-30
2007-01-30
McClellan, James (Department: 3683)
Fluid-pressure and analogous brake systems
Speed-controlled
Odd condition or device detection
C303S122110, C303S122140
Reexamination Certificate
active
11071153
ABSTRACT:
A condition of hydraulic fluid conducted from an accumulator to an operation device via a pressure control unit, is evaluated by determining a pressure (Pa) of the fluid in a flow path interconnecting the accumulator and the control unit, and determining a stabilization time (T) when an absolute value of a pressure gradient per unit time of the pressure falls below a predetermined value. A pressure drop (ΔPa) of the pressure is determined during a period between a time (T0) when the pressure begins to decrease, or at a time before the time (T0) and the stabilization time (T). The pressure drop is compared with a predetermined pressure drop that is obtainable under normal conditions. An increase in (ΔPa) can signify the entry of air into the hydraulic fluid, or a leakage of the hydraulic fluid.
REFERENCES:
patent: 2926965 (1960-03-01), Wilson et al.
patent: 4538228 (1985-08-01), Brearey et al.
patent: 4807945 (1989-02-01), Budecker et al.
patent: 4811252 (1989-03-01), Furuse
patent: 5127712 (1992-07-01), Rizk et al.
patent: 5221125 (1993-06-01), Okochi et al.
patent: 5462343 (1995-10-01), Yoshida et al.
patent: 6126248 (2000-10-01), Kawahata et al.
patent: RE37151 (2001-05-01), LaFountain
patent: 6247765 (2001-06-01), Oyama
patent: 6679569 (2004-01-01), Schmidt et al.
patent: 6729698 (2004-05-01), Kusano et al.
patent: 6927681 (2005-08-01), Yoshino et al.
patent: 63-46959 (1988-02-01), None
Buchanan & Ingersoll & Rooney PC
King Bradley T.
McClellan James
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