Brake device for a motor vehicle having at least three brake circuits

摘要

A brake device for motor vehicles has at least two hydraulic brake circuits which are directly connected to a master brake cylinder, as well as an additional brake circuit, which is able to be actuated via a control device, independently of the master brake cylinder. Because of the separate hydraulic brake circuits in the region of the front axle, redundancy is provided, while the third brake circuit, that is able to be actuated independently of the master brake cylinder and typically acts on the rear wheels, during automatic actuation, permits taking into account a braking effect by additional active assemblies, such as a driven generator.

主权项

1. A brake device for a motor vehicle, comprising:
a first brake circuit group having at least two hydraulic brake circuits; a braking pressure generating device connected to the first group of at least two hydraulic brake circuits, wherein the braking pressure generating device is configured to be operable one of manually or using a pedal, and wherein effect of the braking pressure generating device on wheel brakes is controllable by associated valves; and a second brake circuit group having at least one hydraulic brake circuit, wherein the second brake circuit group is hydraulically decoupled permanently from the braking pressure generating device, and wherein the second brake circuit group is configured to be controlled exclusively using an automatic control device, wherein the brake circuits of the first brake circuit group and the second brake circuit group each have at least one hydraulic pump, the hydraulic pumps being kinematically connected to a common pump drive, wherein the intake side of the hydraulic pumps assigned to the brake circuits of the first brake circuit group are configured to be selectively connected to the high pressure side of the respective brake circuits, and wherein for a decoupling of a hydraulic pressure production in the brake circuits of the first brake circuit group from a hydraulic pressure production in the hydraulic brake circuit of the second brake circuit group, the at least one hydraulic pump assigned to the first brake circuit group is in an idling state.