Fluid-pressure and analogous brake systems – With pump – Pressure control
Reexamination Certificate
2007-05-15
2007-05-15
Torres, Melanie (Department: 3683)
Fluid-pressure and analogous brake systems
With pump
Pressure control
C303SDIG010, C303S114300, C303S138000, C303S165000
Reexamination Certificate
active
11104635
ABSTRACT:
This brake hydraulic pressure control apparatus adopts, as the pressure-increasing valve, a normally-open linear solenoid valve that can linearly adjust the actual differential pressure. This apparatus repeatedly executes, in principle, a control cycle in which a pressure-reducing control, holding control and linear pressure-increasing control make one set, after ABS control start conditions are satisfied (after time t1). In this case, a pulse pressure-increasing control is executed instead of the linear pressure-increasing control only in the first-time control cycle (time t3to t6). Then, the current value IC corresponding to the actual differential pressure at the point of starting the linear pressure-increasing control (time t8) in the second-time control cycle is estimated from the repeated number of times of the pulse pressure-increasing control by utilizing the fact that the repeated number of times becomes a value representing the current value IC corresponding to the actual differential pressure at the same point.
REFERENCES:
patent: 5711585 (1998-01-01), Tozu et al.
patent: 6679564 (2004-01-01), Nitta et al.
patent: 2003-019952 (2003-01-01), None
Advics Co., Ltd.
Torres Melanie
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