Braking device and method for operating a breaking device

Patent metadata

Field	Value
Publication number	US-10112592-B2
Application number	US-201415022394-A
Country	US
Kind code	B2
Filing date	Sep 16, 2014
Priority date	Sep 16, 2013
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

The invention relates to a brake device and a method for operating a brake device, wherein said brake device comprises an actuation device, also a booster device, in particular having an electro-hydraulic drive, a piston cylinder device (main cylinder) in order to supply hydraulic pressure medium to the brake circuits, a valve device for controlling or regulating the supply of the pressure medium and an electronic control or regulating device (ECU). According to the invention provision is made for additional pressure medium volume to be supplied in a controlled manner to at least one brake circuit by means of a further piston cylinder device, in particular a double stroke piston (10) and at least one valve (AS) controlled by the control or regulating device (ECU).

First claim

What is claimed is:

1. An actuation device for a vehicle brake, comprising:
an actuation device in the form of a brake pedal,
at least one piston cylinder unit which is connected to the vehicle brake via a hydraulic brake circuit to supply pressure medium to the brake circuit and to apply pressure on the vehicle brake, and
an electromotive drive for the piston cylinder unit,
wherein the at least one piston cylinder unit includes a piston arranged to be directly driven by the electromotive drive, wherein said piston is arranged to supply pressure medium, via a first pressure chamber, to the brake circuit in a controlled manner in both movement directions of the piston, forward stroke and return stroke, and
wherein a further piston is provided in at least one piston-cylinder unit, wherein the further piston is hydraulically driven and is configured to transfer pressure of the directly-driven piston to a second pressure chamber, wherein the second pressure chamber is connected to a further brake circuit.

2. The actuation device according to claim 1 , wherein the piston cylinder unit forms an annular space from which the pressure medium is enabled to be supplied to at least one brake circuit.

3. The actuation device according to claim 1 , further comprising valves configured to control supply of the pressure medium.

4. The actuation device according to claim 1 , wherein the piston supplying the pressure medium in both movement directions is driven by an electric motor.

5. The actuation device according to claim 1 , wherein volume control and injection in at least one brake circuit takes place via a return stroke of the piston.

6. The actuation device according to claim 1 , wherein supply of the pressure medium by means of the piston in at least two brake circuits takes place simultaneously or serially, and wherein the actuation device further comprises a closing valve.

7. The actuation device according to claim 1 , further comprising at least one securing valve provided in a supply line for the pressure medium.

8. An actuation device for a vehicle brake, comprising:
an actuation device in the form of a brake pedal,
at least one piston cylinder unit which is connected to the vehicle brake via a hydraulic brake circuit to supply pressure medium to the brake circuit and to apply pressure on the vehicle brake, and
an electromotive drive for the piston cylinder unit,
wherein the at least one piston cylinder unit includes a piston arranged to be directly driven by the electromotive drive, wherein said piston is arranged to supply pressure medium, via a first pressure chamber, to the brake circuit in a controlled manner in both movement directions of the piston, forward stroke and return stroke, and
wherein the actuation device further comprises a mechanical coupling in a fallback level and arranged for separating the drive and the piston driven by the drive.

9. The actuation device according to claim 1 , further comprising a positioning sensor for the driven piston and configured for controlling supply of the pressure medium.

10. The actuation device according to claim 1 , further comprising a reservoir configured to receive pressure medium for pressure reduction in one or more of the brake circuits.

11. The actuation device according to claim 1 , wherein a diagnosis of valves and seals takes place during a normal operating process.

12. A double stroke piston for a hydraulic actuation device according to claim 1 , wherein the double stroke piston of the hydraulic actuation device is configured to supply pressure medium in both piston movement directions.

13. An actuation device for a vehicle brake, comprising:
an actuation device in the form of a brake pedal,
at least one piston cylinder unit which is connected to the vehicle brake via a hydraulic brake circuit to supply pressure medium to the brake circuit and to apply pressure on the vehicle brake, and
an electromotive drive for the piston cylinder unit,
wherein the at least one piston cylinder unit includes a piston arranged to be directly driven by the electromotive drive, wherein said piston is arranged to supply pressure medium, via a first pressure chamber, to the brake circuit in a controlled manner in both movement directions of the piston, forward stroke and return stroke, and
wherein a free travel is provided between the brake pedal or a pedal plunger and a spindle or between a coupling plunger and the spindle, wherein the spindle is connected to the piston via a bending rod or a coupling.

14. A method for operating a brake device, wherein said brake device comprises an actuation device having an electro-hydraulic drive, a main piston cylinder device to supply hydraulic pressure medium to brake circuits, a valve device for controlling or regulating supply of the pressure medium, and an electronic control or regulating device (ECU), the method comprising:
supplying pressure medium volume in a controlled manner to at least one brake circuit by means of a further piston cylinder device, including a double stroke piston directly driven by the electrohydraulic drive and configured to perform said supplying pressure medium via a pressure chamber to the at least one brake circuit, and by means of at least one valve controlled by the ECU; and
supplying pressure medium volume, via a further piston that is hydraulically driven by the double stroke piston, and via a further pressure chamber, to at least one further brake circuit.

15. The method according to claim 14 , wherein in a case of low pedal speed, additional pressure medium volume is supplied with pressure in the range of 5 bar, and in the case of high pedal speed with a pressure in the range of 30 bar.

16. The method according to claim 14 , further comprising reducing pressure when the pedal stroke is reduced by opening a solenoid valve and volume outflow in a reservoir.

17. An actuation device for a vehicle brake, comprising:
an actuation device in the form of a brake pedal,
at least one piston cylinder unit which is connected to the vehicle brake via a hydraulic brake circuit to supply pressure medium to the brake circuit and to apply pressure on the vehicle brake, and
an electromotive drive for the piston cylinder unit,
wherein the at least one piston cylinder unit includes a piston arranged to be directly driven by the electromotive drive, wherein said piston is arranged to supply pressure medium, via a first pressure chamber, to the brake circuit in a controlled manner in both movement directions of the piston, forward stroke and return stroke, and
wherein a further piston cylinder unit is provided, wherein the further piston cylinder unit includes a further piston, wherein a working space of the further piston cylinder unit is connected with at least one brake circuit via a hydraulic conduit, wherein the further piston is actuated by the actuating device, and wherein a free travel is provided between the actuating device and the further piston.

18. The actuation device according to claim 17 , wherein the piston cylinder unit forms an annular space from which the pressure medium is enabled to be supplied to at least one brake circuit.

19. The actuation device according to claim 17 , further comprising valves configured to control supply of the pressure medium.

20. The actuation device according to claim 17 , wherein the piston supplying the pressure medium in both movement directions is driven by an electric motor.

21. The actuation device according to claim 17 , wherein vol

Assignees

• Ipgate Ag

Inventors

• Leiber Heinz
• Leiber Thomas
• Unterfrauner Valentin
• Koglsperger Christian

Classifications

• B60T13/686 Primary

  in hydraulic systems or parts thereof · CPC title

• B60T13/745

  acting on a hydraulic system, e.g. a master cylinder · CPC title

• B60T8/4081

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

• B60T2270/82

  Brake-by-Wire, EHB · CPC title

• B60T8/4077

  Systems in which the booster is used as an auxiliary pressure source · CPC title