Electronically Slip-Regulated Vehicle Brake System

Patent metadata

Field	Value
Publication number	US-2016339882-A1
Application number	US-201615159955-A
Country	US
Kind code	A1
Filing date	May 20, 2016
Priority date	May 22, 2015
Publication date	Nov 24, 2016
Grant date	—

Abstract

An electronically slip-regulated vehicle brake system is configured to change from an external force powered operating brake mode into a muscle-powered auxiliary brake mode, and includes a master brake cylinder configured to be operated, a pedal travel simulator configured to simulate an operating travel of the master brake cylinder during the operating brake mode, and a simulator control valve. The simulator includes two pressure chambers. The control valve is configured to control a flow of pressure medium into a first of the two pressure chambers from the master brake cylinder, and is disposed in a return line connecting a wheel brake to a reservoir tank at a position downstream of a connection point at which a second of the two pressure chambers of the simulator is connected to the return line.

First claim

What is claimed is:

1 . An electronically slip-regulated vehicle brake system, comprising:
an operating brake including a pressure generator that is drivable via external power, and that is configured to produce an operating brake pressure; an auxiliary brake including a master brake cylinder that operable via muscle power, and that is configured to produce an auxiliary brake pressure; a device configured to change the vehicle brake system from an operating brake mode into an auxiliary brake mode; a brake circuit that is connected to the master brake cylinder, and that includes:
a return line;
at least one wheel brake configured to form a pressure medium connection to a reservoir tank via the return line; and
a pressure reducing valve configured to control the pressure medium connection from the at least one wheel brake to the reservoir tank to regulate the operating brake pressure during the operating brake mode;
a pedal travel simulator that is configured to simulate an operating travel of the master brake cylinder during the operating brake mode, and that includes a first pressure chamber and a second pressure chamber, the second pressure chamber connected to the return line of the brake system at a first position along the return line; and a simulator control valve disposed in the return line of the brake circuit at a second position downstream of the first position, and configured to control a flow of pressure medium from the master brake cylinder into the first pressure chamber of the pedal travel simulator.

2 . The electronically slip-regulated vehicle brake system according to claim 1 , wherein the simulator control valve includes a switching valve configured to switch from a normal position whereat the switching valve is closed to a conducting position via electronic activation.

3 . The electronically slip-regulated vehicle brake system according to claim 1 , wherein the pressure reducing valve includes a continuously regulated solenoid valve that is switchable between a normal position whereat the solenoid valve is open and an end position whereat the solenoid valve is closed.

4 . The electronically slip-regulated vehicle brake system according to claim 1 , wherein the pressure generator includes a displacement pump that is drivable to suck pressure medium directly out of the reservoir tank and feed the pressure medium toward the wheel brake.

5 . The electronically slip-regulated vehicle brake system according to claim 4 , wherein the pressure generator further includes a gear pump.

6 . The electronically slip-regulated vehicle brake system according to claim 1 , wherein the pedal travel simulator further includes:
a simulator piston that separates the first pressure chamber from the second pressure chamber; and an elastic piston restoring element that is disposed in the second pressure chamber, and that is configured to operate the simulator piston.

7 . The electronically slip-regulated vehicle brake system according to claim 1 , further comprising:
a pressure modulation device that includes at least one continuously regulated pressure reducing valve, wherein:
the brake circuit includes a plurality of wheel brakes; and
at least one of the plurality of wheel brakes is associated with the pressure modulation device.

8 . The electronically slip-regulated vehicle brake system according to claim 1 , wherein:
the vehicle brake system comprises a plurality of brake circuits; each brake circuit includes a plurality of wheel brakes and a pressure modulation device having at least one continuously regulated pressure reducing valve, the continuously regulated pressure reducing valves of the plurality of brake circuits being of a same type.

Assignees

• Bosch Gmbh Robert

Inventors

• Brenndoerfer Daniel

Classifications

• B60T2270/82

  Brake-by-Wire, EHB · CPC title

• B60T8/4081 Primary

  Systems with stroke simulating devices for driver input (B60T8/4077 takes precedence) · CPC title

• B60T2270/602

  ABS features related thereto · CPC title

• B60T2270/604

  Merging friction therewith; Adjusting their repartition · CPC title

• B60T8/176 Primary

  Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS (B60T8/1755 takes precedence) · CPC title