METHOD AND DEVICE FOR OPERATING A HYDRAULIC VEHICLE BRAKE SYSTEM
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Accused Products
Abstract
Disclosed is a method for operating a hydraulic vehicle brake system, having a brake pressure generator operable by a brake actuating device and essentially consisting of a master brake cylinder and a hydraulic booster connected upstream thereof which includes a booster chamber and a booster piston arranged therein, which latter for brake force boosting purposes, can be acted upon by a hydraulic pressure of a high-pressure accumulator that is chargeable by a hydraulic pump according to a sensor system which detects actuation and/or according to a pressure sensor sensing the hydraulic pressure that prevails in the master brake cylinder. In order to provide a safe fallback mode, upon failure of the high-pressure accumulator, the wheel brakes are acted upon by hydraulic pressure of the hydraulic pump according to the sensor system which detects actuation or according to the pressure sensor. Likewise, provisions are made that upon failure of the pump, hydraulic pressure out of the high-pressure accumulator is applied to the booster chamber according to the sensor system which detects actuation or according to the pressure sensor.
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Citations
18 Claims
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1-9. -9. (canceled)
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10. A method for operating a hydraulic vehicle brake system comprising a brake pressure generator by a brake actuating device and connectable to wheel brakes (30, 31) of the vehicle via a hydraulic line, wherein the brake pressure generator is generally composed of a master brake cylinder (11) and a hydraulic booster (7) connected upstream thereof which includes a booster chamber (47) and a booster piston (41) arranged therein, which latter is operatively connected to a master brake cylinder piston by way of an actuating element (42) in the direction of force output and which, for brake force boosting purposes, can be acted upon by a hydraulic pressure of a high-pressure accumulator (4) that is chargeable by a hydraulic pump (19, 20) according to a sensor system (60) which detects actuation or senses the hydraulic pressure via a pressure sensor (10a) that prevails in the master brake cylinder (11), the method comprising:
upon failure of the high-pressure accumulator (4), the wheel brakes (30, 31) are acted upon by hydraulic pressure of the hydraulic pump (19, 20) according to the sensor system (60) which detects actuation or senses pressure. - View Dependent Claims (11, 12, 13)
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14. A hydraulic vehicle brake system comprising:
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a brake pressure generator having a master brake cylinder (11) and a hydraulic booster (7) connected upstream thereof which includes a booster chamber (47) and a booster piston (41) arranged therein; a brake actuation device, wherein the brake pressure generator is operable by the brake actuating device and being connectable to wheel brakes (30, 31) of the vehicle by way of a hydraulic line which latter is operatively connected to a master brake cylinder piston by way of an actuating element (42) in the direction of force output and which, for brake force boosting purposes, can be acted upon by a hydraulic pressure of a high-pressure accumulator (4) that is chargeable by a hydraulic pump (19, 20) according to a sensor system (60) which detects actuation and/or according to a pressure sensor (10a) sensing the hydraulic pressure that prevails in the master brake cylinder (11); and a device is provided which, upon failure of the high-pressure accumulator (4), applies hydraulic pressure of the hydraulic pump (19, 20) to the wheel brakes (30, 31) according to the sensor system (60) which detects actuation or according to the pressure sensor (10a). - View Dependent Claims (15, 16, 17, 18)
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Specification