Brake system for motor vehicles

Patent metadata

Field	Value
Publication number	US-2016272178-A1
Application number	US-201415036143-A
Country	US
Kind code	A1
Filing date	Nov 13, 2014
Priority date	Nov 21, 2013
Publication date	Sep 22, 2016
Grant date	—

Abstract

A brake system for motor vehicles, which can be actuated in a “brake-by-wire” operating mode both by the vehicle driver and independently of the vehicle driver. In the “brake-by-wire” operating mode the system can be operated in at least one fallback operating mode, with a brake master cylinder, actuated by a brake pedal, having a housing and two pistons, which delimit two pressure chambers, are assigned to brake circuits with wheel brakes, a pressure medium reservoir, one electrically actuable inlet valve per wheel brake for setting wheel-individual brake pressures, a first electrically controllable pressure provision device for loading the wheel brakes with pressure, and a second electrically controllable pressure provision device with at least one vacuum connector and a pressure connector, the vacuum connector is connected to the pressure medium reservoir. The pressure connector is connected to at least one wheel brake without a valve being connected in between.

First claim

1 . A brake system for motor vehicles, which brake system can be actuated in a “brake-by-wire” operating mode both by the vehicle driver and independently of the vehicle driver, and can be operated in at least one fallback operating mode, the system comprising:
a master brake cylinder which can be actuated by way of a brake pedal and which has a housing and two pistons which, in the housing, delimit two pressure chambers which are assigned to brake circuits with wheel brakes,
a pressure medium reservoir,
an electrically actuable inlet valve for each wheel brake, for the setting of wheel-specific brake pressures,
a first electrically controllable pressure provision device for the pressurization of the wheel brakes in the “brake-by-wire” operating mode,
a simulation device which, in the “brake-by-wire” operating mode, imparts an acceptable brake pedal feel to the vehicle driver, and
a second electrically controllable pressure provision device having at least one suction port and one pressure port, the suction port of which is connected, without a valve being connected in between, to the pressure medium reservoir,
wherein the pressure port of the second pressure provision device is connected to at least one wheel brake without a valve being connected in between.

2 . The brake system as claimed in claim 1 , wherein the second pressure provision device is, in hydraulic terms, of at least two-circuit design, wherein each of the pressure ports is connected to at least one wheel brake without a valve being connected in between.

3 . The brake system as claimed in claim 2 , wherein the second pressure provision device comprises at least two hydraulic pumps which are driven jointly by one electric motor and which have in each case one suction port and one pressure port, wherein each of the pressure ports is connected to at least one wheel brake without a valve being connected in between.

4 . The brake system as claimed in claim 3 , wherein each of the pressure ports of the first and of the second pump is connected to precisely one wheel brake.

5 . The brake system as claimed in claim 4 , wherein the pressure ports of the first and of the second pump are connected to wheel brakes of different brake circuits.

6 . The brake system as claimed in claim 3 , wherein for the first and the second pump, in each case one electrically actuable valve, which is closed when deenergized and/or is analogized or actuated in analog fashion, is provided, which valve is connected in parallel with the pump.

7 . The brake system as claimed in claim 1 , wherein the one or more pressure port(s) is/are connected to a connecting line between the wheel brake and the outlet-side port of the associated inlet valve.

8 . The brake system as claimed in claim 1 , wherein a pressure detection device is provided which detects a pressure port-side pressure of the second pressure provision device.

9 . The brake system as claimed in claim 1 , further comprising a first electronic control and regulation unit for the actuation of the first pressure provision device and a second electronic control and regulation unit for the actuation of the second pressure provision device, and of the valves, and for the evaluation of the output signals of the pressure detection device.

10 . The brake system as claimed in claim 9 , wherein the second pressure provision device is arranged in an independent assembly, wherein the assembly additionally comprises at least one of the pressure detection device, the second electronic control and regulation unit, and the valves.

Assignees

• Continental Teves Ag & Co Ohg

Inventors

• Feigel Hans-Jörg

Classifications

• B60T13/686

  in hydraulic systems or parts thereof · CPC title

• B60T13/745

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

• B60T8/4081 Primary

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

• B60T2270/82

  Brake-by-Wire, EHB · CPC title

• B60T2270/402

  Back-up · CPC title