Brake system having a blending capability

Abstract

The invention relates to a brake system (1) for a motor vehicle, comprising a hydraulic brake (10), a brake cylinder (12) of which has a first and a second brake piston (12-1, 12-2), wherein the first brake piston (12-1) supplies a first brake circuit (14-1), which is associated with a first vehicle axle, with hydraulic brake pressure and the second brake piston (12-2) supplies a second brake circuit (14-2), which is separate from the first brake circuit and is associated with a second vehicle axle, with hydraulic brake pressure, an electric motor (100) on the first vehicle axle, which electric motor can be used as a recuperator, and a blending means (26), which withdraws hydraulic fluid from the first brake circuit (14-1) during a recuperation phase of the electric motor (100). The invention is characterized in that a separating wall (12-3) is formed in the brake cylinder (12) between the first and second brake piston (12-1, 12-2), which separating wall divides the brake cylinder (12) into a first pressure chamber (16-1) associated with the first brake piston (12-1) and, separated therefrom, a second pressure chamber (16-2) associated with the second brake piston (12-2), and that the first and second brake piston (12-1, 12-2) are rigidly connected to each other.

Description

technical field [0001] The invention relates to a brake system for a motor vehicle of the type specified in the preamble of claim 1 . Background technique [0002] It is well known that there is a problem in hybrid vehicles where maximum regeneration / recovery should occur during braking with an electrically driven rear axle and where the mechanical braking device - which is connected in parallel to the electric machine - should be as small as possible brake at the same time. The reason for this is that the largest possible proportion of the braking energy should be converted into electrical energy. However, due to different actual situations, the regenerative power of the motor battery pack is not stable, but is related to various boundary conditions, such as the state of charge of the battery, the operating temperature of the motor, and so on. It is therefore desirable for the braking system to be compound-braking, ie to allow a flexible distribution of the braking power ...

AI Technical Summary

Problems solved by technology

[0004] Now if in a hybrid vehicle in which for example the rear axle is driven electrically, the hybrid vehicle has hydraulic brakes known from the prior art (=> black / white distribution of the brake circuit, i.e. for the front and rear axle The separate brake circuit, which is supplied with hydraulic brake pressure by the brake master cylinder in a tandem configuration), obtains hydraulic fluid from the brake circuit assigned to the rear axle in order to reduce the braking power (pressure lowering), the floating piston of the brake master cylinder compensates for the above situation again, so that the rear axle is now overbraked due to the additional electric braking torque on the rear axle

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