Pressure control apparatus for adjusting brake pressure in a vehicle
First Claim
1. Pressure control apparatus for adjusting a brake pressure in a brake system of a vehicle, comprisinga reservoir in which a pressure fluid is stored,an outlet through which said pressure fluid is discharged,at least one brake cylinder of said brake system,an inlet valve through which said pressure fluid is supplied from said reservoir to said brake cylinder,an outlet valve through which said pressure fluid is discharged from said brake cylinder to said outlet anda digital controller which controls the opening and closing of said inlet and outlet valves, said digital controller operating in accordance with a control formula to minimize a deviation between an actual value and a command variable,wherein said digital controller comprises a pressure phase detector which recognizes a current pressure phase determined by said command variable and adjusts said control formula as a function of said current pressure phase.
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Accused Products
Abstract
A pressure control apparatus for adjusting the brake pressure in a braking system of a vehicle comprises a reservoir in which a pressure fluid is stored, an outlet through which the pressure fluid is discharged, at least one brake cylinder of the braking system, inlet and outlet valves through which the pressure fluid is supplied to and discharged from the brake cylinder, and a digital controller which controls the opening and closing of the inlet and outlet valves to minimize the deviation between an actual value and a command variable. The digital controller comprises individual controllers associated with the inlet and outlet valves. The individual controllers operate in accordance with a changeable PIDD2 control formula. The digital control further comprises a three-stage controller connected downstream of the individual controllers and adjustable low pass filters for the inlet and outlet valves. A pressure phase detector determines the current pressure phase to be set (i.e., increase, maintain or decrease) based on the command variable, and adjusts the operation of the individual controllers, the three-stage controller, and the low pass filters based on the current pressure phase.
56 Citations
18 Claims
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1. Pressure control apparatus for adjusting a brake pressure in a brake system of a vehicle, comprising
a reservoir in which a pressure fluid is stored, an outlet through which said pressure fluid is discharged, at least one brake cylinder of said brake system, an inlet valve through which said pressure fluid is supplied from said reservoir to said brake cylinder, an outlet valve through which said pressure fluid is discharged from said brake cylinder to said outlet and a digital controller which controls the opening and closing of said inlet and outlet valves, said digital controller operating in accordance with a control formula to minimize a deviation between an actual value and a command variable, wherein said digital controller comprises a pressure phase detector which recognizes a current pressure phase determined by said command variable and adjusts said control formula as a function of said current pressure phase.
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11. A method for adjusting a brake pressure in a brake system of a vehicle, wherein said brake system comprises a reservoir in which a pressure fluid is stored, an outlet through which said pressure fluid is discharged, at least one brake cylinder, an inlet valve through which said pressure fluid is supplied from said reservoir to said brake cylinder, and an outlet valve through which said pressure fluid is discharged from said brake cylinder to said outlet, said method comprising:
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controlling the opening and closing of said inlet and outlet valve in accordance with a control formula to minimize a deviation between an actual value and a command variable, detecting a current pressure phase determined by said command variable, and adjusting said control formula as a function of said current pressure phase. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification