# US 11,999,326 B2 · Braking system with two pressure sources, and method for operating a braking system with two pressure sources

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- Number: US 11,999,326 B2
- Document ID: US11999326B2
- Status: Granted
- Kind: B2
- Application number: 17/054,672
- Filed: 2019-05-15
- Published: 2021-02-25
- Granted: 2024-06-04
- Earliest claimed: 2018-05-24
- Assignees: Continental Teves AG & Co. oHG
- Applicants: Continental Teves AG & Co OhG
- Inventors: Marco Besier; Stefan Drumm
- Web page: https://patentgrep.com/patent/US11999326B2

## CPC

- B60T 13/58: Combined or convertible systems
- B60T 8/17: Using electrical or electronic regulation means to control braking {(detecting or indicating faulty operation B60T8/885)}
- B60T 8/326: {Hydraulic systems}
- B60T 8/885: {using electrical circuitry}
- B60T 13/745: {acting on a hydraulic system, e.g. a master cylinder}
- B60T 15/028: {in hydraulic systems}
- B60T 7/042: {by electrical means, e.g. using travel or force sensors}
- B60T 8/4081: {Systems with stroke simulating devices for driver input (B60T8/4077 takes precedence)}
- B60T 13/16: using pumps directly, i.e. without interposition of accumulators or reservoirs
- B60T 13/161: {Systems with master cylinder}
- B60T 2220/04: Pedal travel sensor, stroke sensor; Sensing brake request
- B60T 2270/402: Back-up
- B60T 2270/403: Brake circuit failure
- B60T 2270/404: Brake-by-wire or X-by-wire failsafe
- B60T 2270/413: Plausibility monitoring, cross check, redundancy
- B60T 2270/82: Brake-by-Wire, EHB
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES

## Abstract

A braking system including four hydraulically actuatable wheel brakes. A normally closed outlet valve is assigned to each wheel brake and a normally open inlet valve is assigned to each wheel brake. Two pressure supply devices are provided for active pressure build-up in the wheel brakes. A first and a second brake circuit are hydraulically configured with two wheel brakes respectively, wherein in each brake circuit a respective pressure supply device is hydraulically connected to two wheel brakes. A first and a second control and regulating unit are provided, wherein the first control and regulating unit electrically controls the pressure supply device of the first brake circuit, and wherein the second control and regulating unit hydraulically controls the pressure supply device of the second brake circuit, and the two control and regulating units are connected together via a data interface.

## Claims

### Claim 1

A braking system comprising four hydraulically actuatable wheel brakes, wherein one normally closed outlet valve is assigned to each wheel brake and one normally open inlet valve is assigned to each wheel brake, wherein two pressure supply devices are provided for active pressure build-up in the wheel brakes, wherein a first brake circuit and a second brake circuit are hydraulically configured with two wheel brakes of the four hydraulically actuatable wheel brakes, respectively, wherein a first pressure supply device is hydraulically connected to the two wheel brakes of the first brake circuit and a second pressure supply device is hydraulically connected to the two wheel brakes of the second brake circuit, wherein a first and a second control and regulating unit are provided, wherein the first control and regulating unit electrically controls the pressure supply device of the first brake circuit, and wherein the second control and regulating unit electrically controls the pressure supply device of the second brake circuit, wherein the two control and regulating units are connected together via a data interface, and wherein the two brake circuits are connected in hydraulically isolatable fashion by way of two normally closed circuit switch-on valves, wherein a first normally closed circuit switch-on valve of two normally closed circuit switch-on valves is configured to be controlled by the first control and regulating unit, and wherein a second normally closed circuit switch-on valve of the two normally closed circuit switch-on valves is configured to be controlled by the second control and regulating unit, and wherein precisely one normally closed outlet valve of the normally closed outlet valves in the second brake circuit is configured to be controlled by the first control and regulating unit, and wherein precisely one normally closed outlet valve of the normally closed outlet valves in the first brake circuit is configured to be controlled by the second control and regulating unit.

### Claim 2 (depends on 1)

The braking system as claimed in claim 1, wherein a pedal feel simulator is provided.

### Claim 3 (depends on 2)

The braking system as claimed in claim 2, wherein the pedal feel simulator can be actuated by a brake pedal.

### Claim 4 (depends on 3)

The braking system as claimed in claim 3, wherein the brake pedal is coupled by a coupling rod to an axially movable simulator piston, and wherein two redundantly designed travel sensors are provided which measure the piston travel and/or pedal travel respectively.

### Claim 5 (depends on 4)

The braking system as claimed in claim 4, wherein a first of the two travel sensors is connected to the first control and regulating unit on the signal input side, and wherein a second of the two travel sensors is connected to the second control and regulating unit on a signal input side.

### Claim 6 (depends on 1)

The braking system as claimed in claim 1, wherein the two pressure supply devices are configured as linear actuators.

### Claim 7 (depends on 1)

The braking system as claimed in claim 1, wherein one pressure supply device of the two pressure supply devices is configured as a linear actuator, and wherein the other pressure supply device of the two pressure supply devices is formed as a pump.

### Claim 8 (depends on 1)

The braking system as claimed claim 1, wherein two separate on-board networks are provided, and wherein each pressure supply device of the two pressure supply devices is powered by a respective one of the two on-board networks.

### Claim 9 (depends on 1)

The braking system as claimed in claim 1, wherein the wheel brakes are hydraulically divided between the two brake circuits by axle.

### Claim 10 (depends on 1)

The braking system as claimed in claim 1, wherein a master brake cylinder is connected to the wheel brakes in hydraulically isolatable fashion.

### Claim 11 (depends on 1)

A method for operating the braking system as claimed in claim 1, wherein the two normally closed circuit switch-on valves are arranged in a hydraulic path between the first brake circuit and the second brake circuit and wherein on electrical failure of one brake circuit of the first brake circuit and the second brake circuit, in a failed brake circuit a pressure is controlled by actuation of one of the two normally closed circuit switch-on valves and an outlet valve of the at least one normally closed outlet valve in the first brake circuit or in the second brake circuit by the control and regulating unit in an electrically intact brake circuit, and wherein the pressure in the electrically intact brake circuit is controlled by two inlet valves of the at least one normally open inlet valve and one outlet valve of the at least one normally closed outlet valve in the first brake circuit or in the second brake circuit.

### Claim 12 (depends on 11)

The method as claimed in claim 11, wherein to build up pressure in the failed brake circuit, a pre-pressure is built up by an intact pressure supply unit in the electrically intact brake circuit, and wherein one of the two normally closed circuit switch-on valves is opened so that brake fluid flows into the failed brake circuit.

### Claim 13 (depends on 11)

The method as claimed in claim 11, wherein to dissipate pressure in the failed brake circuit, an outlet valve of the at least one normally closed outlet valve in the failed brake circuit is opened by an intact control and regulating unit.

### Claim 14 (depends on 11)

The method as claimed in claim 11, wherein to build up pressure in the intact brake circuit, brake fluid from a pressure chamber of the pressure supply device is conducted through the at least one inlet valve into one wheel brake of the two wheel brakes.

### Claim 15 (depends on 11)

The method as claimed in claim 11, wherein to dissipate pressure in the intact brake circuit, an outlet valve of the at least one normally closed outlet valve in the first brake circuit or in the second brake circuit is actuated by the control and regulating unit of the intact brake circuit, and wherein the inlet valve is opened of the wheel brake, to which an intact outlet valve is assigned.

### Claim 16 (depends on 15)

The method as claimed in claim 15, wherein in addition, the inlet valve of the wheel brake is opened which is assigned to the wheel brake of the two wheel brakes with a failed outlet valve.

### Claim 17 (depends on 15)

The method as claimed in claim 15, wherein at least one pressure supply device of the two pressure supply devices is configured as a linear actuator and wherein an actuator piston position is maintained during pressure dissipation.