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Method for providing a negative pressure in a vacuum chamber of a pneumatic brake booster

A vacuum chamber and pneumatic technology, applied in the direction of brakes, brake transmissions, vehicle components, etc., can solve problems such as noise, large vacuum pump, and vehicle driver interference

Active Publication Date: 2008-11-19
CONTINENTAL AUTOMOTIVE TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its disadvantage is that the actuation and operation of the vacuum pump will cause a lot of noise under different driving conditions, which is disturbing to the vehicle driver

Method used

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  • Method for providing a negative pressure in a vacuum chamber of a pneumatic brake booster
  • Method for providing a negative pressure in a vacuum chamber of a pneumatic brake booster

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Experimental program
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Embodiment Construction

[0014] As can be seen from Fig. 1, the brake operating device for implementing the method of the present invention includes a pneumatic brake booster 1, a brake master cylinder 2 arranged on the brake booster, and a pneumatic motor-pump assembly 3.

[0015] The basic design and function of brake actuating devices are generally known, so only the essential features of the invention will be described below.

[0016] The not-shown interior of brake booster 1 is divided by at least one movable wall into at least one vacuum chamber and at least one working chamber. The master brake cylinder 2 has two pistons, not shown, which are movable in a housing and delimit a respective hydraulic pressure chamber together with the housing. The pressure chamber can be connected to an unpressurized pressurized fluid storage chamber 4 and can be connected via an outlet 5 to wheel brakes in a not shown motor vehicle braking system.

[0017] The motor-pump unit 3 comprises a vacuum pump 6 and an ...

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PUM

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Abstract

The invention relates to a method for providing a negative pressure of a brake actuation device of an automotive braking system comprising a pneumatic brake booster (1), the interior of which is subdivided into at least one vacuum chamber and at least one working chamber. The brake booster comprises a master brake cylinder (2) and a pneumatic motor / pump unit (3) for providing the negative pressure in the vacuum chamber. Said unit comprises a vacuum pump (6) and a motor (7) driving said vacuum pump (6). A sensor (9) detects a negative pressure level in the vacuum chamber or a pressure difference between the vacuum chamber and the working chamber. The motor / pump unit is switched on by an electronic control unit (12) when the pressure falls below a first defined lower negative pressure level and is switched off when a second defined upper negative pressure level is reached. The invention is characterized in that a speed of the motor / pump unit (3) is controlled subject to driving states of the vehicle.

Description

technical field [0001] The invention relates to a method for providing a vacuum of a brake operating device of a motor vehicle brake system, the brake operating device comprising a pneumatic brake booster whose inner space is divided into at least one vacuum chamber and at least one working chamber , a brake master cylinder and a pneumatic motor-pump assembly for providing a vacuum in the vacuum chamber, the motor-pump assembly includes a vacuum pump and a motor driving the vacuum pump, wherein the vacuum level in the vacuum chamber is detected by means of a sensor or the vacuum chamber When the vacuum in the vacuum chamber drops below the specified lower vacuum level, the motor-pump unit is started by the electronic control module, and when the specified upper vacuum level is reached, the motor-pump unit is turned off. pump set. Background technique [0002] Such a method is known, for example, from DE 19929880 A1, in which a vacuum pump is additionally actuated depending ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60T13/52B60T13/02
Inventor J·舍恩尔奥M·吕费尔J·冈萨雷斯
Owner CONTINENTAL AUTOMOTIVE TECH GMBH