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Brake system for motor vehicles

By using a graded piston and an electronically controllable pressure providing device in the motor vehicle braking system, combined with a hydraulic brake pressure modulation unit and a pedal decoupling unit, the problem of temporary sinking of the blocking piston in the brake-by-wire braking system is solved. Improved brake pedal comfort and dynamics result in better braking performance.

Inactive Publication Date: 2011-06-15
CONTINENTAL TEVES AG & CO OHG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the pedal is operated quickly, the following problem arises in the known brake system: the electrically controllable pressure supply device configured as a motor pump assembly cannot establish the required blocking pressure with the same dynamic characteristics, so that the blocking piston can leave its stop temporarily
This movement results in an uncomfortable brake pedal feel for the vehicle driver

Method used

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Examples

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Embodiment Construction

[0020] figure 1 The shown braking system according to the invention essentially comprises an actuating device 1, a pedal decoupling unit 2, an electrically controllable pressure supply device 3, wherein the actuating device 1 and the pressure supply device 3 form a brake booster unit, the brake The dynamic system also includes a brake master cylinder or tandem master cylinder 4 operatively connected downstream of the brake booster unit, the pressure chambers 14, 15 of which can be connected to the The chambers of the pressure medium storage container 11 at atmospheric pressure are connected. In addition, the above-mentioned pressure chambers 14, 15 are connected to the pressure medium storage container 11 through electromagnetically operable, preferably normally open (open when no current, OS) two-position two-way reversing valves 41, 42, the two-position two-way The function of the reversing valve will be described below. On the other hand, the wheel brake circuits I, II ar...

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PUM

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Abstract

The invention relates to a brake system comprising a main brake cylinder (4) and a pedal decoupling unit (2) provided with a holding piston (18), the first ring surface thereof (26) together with a first primary brake cylinder piston (22) defining a first hydraulic chamber (23) that is hydraulically pressurised with an electrically controllable pressure supply device (3). In order to improve the pedal characteristics of the brake system, in particular in a brake-by-wire brake system, the holding piston (18) is embodied as a differential piston, the second ring surface (27) thereof defining a second, blockable hydraulic chamber (28), and a piston that effects in the second chamber (28) corresponds to a force that acts counter to the direction of actuation on the holding piston.

Description

technical field [0001] The invention relates to a braking system for a motor vehicle having the features stated in the preamble of claim 1 . Background technique [0002] Such a braking system is disclosed in International Patent Application WO 2004 / 080772A1. The elastic element of the simulator device is designed as a compression spring which is operatively arranged between the input force element and the blocking piston (constraining piston). Therefore, in the (normal) mode of operation, ie "brake-by-wire", the blocking piston must be held against a fixed stop relative to the housing in order to provide a stable support for the above-mentioned pressure spring. When the pedal is operated quickly, the following problem arises in the known brake system: the electrically controllable pressure supply device configured as a motor pump assembly cannot establish the required blocking pressure with the same dynamic characteristics, so that the blocking piston can Momentarily out ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T8/40B60T13/12B60T13/16B60T13/66B60T13/74
CPCB60T13/686B60T2201/03B60T7/042B60T8/4077B60T13/143B60T8/40B60T13/12B60T13/66B60T13/74
Owner CONTINENTAL TEVES AG & CO OHG
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