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US 2019/0054910 A1Published application
Braking device for a hydraulic motor vehicle brake system
AssigneeContinental Teves AG & Co. oHG
InventorLothar Schiel
Life of this patent
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Abstract
A braking device for a hydraulic motor vehicle brake system, with an energy-store-free, electronically controlled electric-motor-driven on-demand braking force booster and with a master brake cylinder, in which, for the purpose of reducing the foot force on the brake pedal in the fall-back level, the braking pressure in the pressure chamber is built up stepwise and at least one active surface involved in generating brake pressure is switchable so as to be hydraulically ineffective.
Claims12
A brake device for a hydraulic motor vehicle brake system, comprising:
- an energy-store-free, electronically controlled brake booster,
- an electric-motor-powered drive unit which is assigned to the brake booster,
- wherein when the drive unit is activated the brake booster generates a boosted braking force, and when the drive unit is deactivated the brake booster does not generate any boosted braking force,
- a master brake cylinder with at least one piston which can be displaced linearly therein and which bounds at least one pressure chamber filled with a pressure medium, in order to generate hydraulic brake pressure,
- wherein in the case of a usual service braking operation the brake booster acts on the piston, and in the case of an unusual braking operation the muscle force of a driver acts thereon,
- wherein at least one active area for generating brake pressure in the pressure chamber can be switched to a hydraulically ineffective setting under pressure control in the master brake cylinder, as a result of which the brake pressure in the pressure chamber is built up incrementally, and
- wherein the active area is switched off by a valve arrangement which is controlled by the pressure in the pressure chamber.
4 more elements
Dependencies are inferred from the claim text.