# US 2014/0152082 A1 · Control device for a vehicle brake system and method for operating a vehicle brake system

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- Number: US 2014/0152082 A1
- Document ID: US20140152082A1
- Status: Published application
- Kind: A1
- Application number: 14/118,084
- Filed: 2012-03-19
- Published: 2014-06-05
- Earliest claimed: 2011-05-17
- Assignees: Robert Bosch GmbH
- Inventors: Stefan Strengert; Michael Kunz
- Web page: https://patentgrep.com/patent/US20140152082A1

## CPC

- B60T 8/17: Using electrical or electronic regulation means to control braking {(detecting or indicating faulty operation B60T8/885)}
- B60T 1/10: by utilising wheel movement for accumulating energy, e.g. driving air compressors
- B60T 7/042: {by electrical means, e.g. using travel or force sensors}
- B60T 8/4872: {pump-back systems}
- B60T 13/146: {Part of the system directly actuated by booster pressure}
- B60T 13/586: {the retarders being of the electric type}
- B60T 13/662: {characterised by specified functions of the control system components}
- B60T 13/686: {in hydraulic systems or parts thereof}
- B60T 2270/604: Merging friction therewith; Adjusting their repartition
- B60W 10/188: hydraulic brakes
- B60W 30/18127: {Regenerative braking}
- B60W 2510/083: Torque
- B60W 2710/182: Brake pressure, e.g. of fluid or between pad and disc
- 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
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT

## Abstract

A control device for a brake system of a vehicle includes a valve control device, using which, while taking into account a provided information signal with respect to a currently exerted or to be exerted generator braking torque of a generator, at least one high-pressure switching valve of a brake circuit of the brake system is able to be controlled into an at least partially opened state such that a brake fluid volume is able to be displaced from a main brake cylinder of the brake system into a storage chamber of the brake circuit via the at least one high-pressure switching valve that has been controlled into the at least partially opened state. Furthermore, a method for operating a brake system of a vehicle is described.

## Claims

### Claim at position 1

1-13. (canceled)

### Claim 14

A control device for a brake system of a vehicle, comprising:
a valve control device adapted to control, while taking into account a provided information signal with respect to a currently carried out or to be carried out generator braking torque of a generator, at least one valve of a brake circuit of the brake system into an at least partially opened state such that a brake fluid volume is displaceable from a main brake cylinder of the brake system into a storage chamber of the brake circuit via the at least one valve that has been controlled into the at least partially opened state;
wherein the valve control device is adapted to control a high-pressure switching valve of the brake circuit as the at least one valve, into the at least partially opened state such that the brake fluid volume is displaceable from the main brake cylinder into the storage chamber via the high-pressure switching valve that has been controlled into the at least partially opened state.

### Claim 15 (depends on 14)

The control device according to claim 14, wherein, provided the information signal is less than a comparative signal with respect to a least generator braking torque, the high-pressure switching valve is controllable into a closed state using the valve control device such that a hydraulic connection between the main brake cylinder and the storage chamber, by the high-pressure switching valve that has been controlled into the closed state, is prevented.

### Claim 16 (depends on 15)

The control device according to claim 15, wherein, provided the information signal is greater than the comparative signal, at least one wheel inlet valve of the brake circuit is controllable into a closed state such that a hydraulic connection between the main brake cylinder and at least one wheel brake caliper of the brake circuit, by the at least one wheel inlet valve controlled into the closed state, is prevented.

### Claim 17 (depends on 14)

The control device according to claim 14, further comprising:
a generator control device adapted to establish the generator braking torque of the generator to be exerted while taking into account a first sensor signal with respect to an operating force of an operation of a brake operating element of the brake system and/or of a second sensor signal and/or information signal with respect to at least one optional generator braking torque that is able to be carried out, and adapted to output to the generator a generator control signal corresponding to the established generator braking torque that is to be exerted.

### Claim 18 (depends on 17)

The control device according to claim 17, wherein the generator control device is adapted to establish the generator braking torque to be carried out, while taking into account the second sensor signal and/or information signal and a function (bx(t)) of a variable derived from the first sensor signal, a maximum of the function (bx(t)) being close to a variable (x(t)) derived from the first sensor signal equal to a minimum operating force (xmin), as of which a driver braking force applied to the brake operating element is able to be transmitted to an adjustable main brake cylinder piston of the main brake cylinder.

### Claim 19 (depends on 14)

The control device according to claim 14, further comprising:
a pump control device adapted to control, provided the currently exerted or to be exerted generator braking torque decreases over time, a pump of the brake circuit, which is adapted to pump the brake fluid from the storage chamber of the brake circuit to at least one wheel brake caliper of the brake circuit, from an inactive pumping mode to an active pumping mode.

### Claim 20

A brake system for a vehicle, comprising:
a control device for a brake system of a vehicle, comprising:
a valve control device adapted to control, while taking into account a provided information signal with respect to a currently carried out or to be carried out generator braking torque of a generator, at least one valve of a brake circuit of the brake system into an at least partially opened state such that a brake fluid volume is displaceable from a main brake cylinder of the brake system into a storage chamber of the brake circuit via the at least one valve that has been controlled into the at least partially opened state;
wherein the valve control device is adapted to control a high-pressure switching valve of the brake circuit as the at least one valve, into the at least partially opened state such that the brake fluid volume is displaceable from the main brake cylinder into the storage chamber via the high-pressure switching valve that has been controlled into the at least partially opened state.

### Claim 21 (depends on 20)

The brake system according to claim 20, further comprising:
a continuously regulatable high-pressure switching valve.

### Claim 22

A method for operating a brake system of a vehicle, comprising:
comparing a braking torque variable with respect to a currently exerted or to be exerted generator braking torque of a generator to a comparative variable with respect to a least generator braking torque;
provided the braking torque variable is greater than the comparative variable, controlling at least one valve of a brake circuit of the brake system into an at least partially opened state such that a brake fluid volume is able to be displaced from a main brake cylinder of the brake system into a storage chamber of the brake circuit via the at least one valve that has been controlled into the at least partially opened state; and
controlling a high-pressure switching valve of the brake circuit as the at least one valve, into the at least partially opened state such that the brake fluid volume pressed out from the main brake cylinder is displaced into the storage chamber via the high-pressure switching valve that has been controlled into the at least partially opened state.

### Claim 23 (depends on 22)

The method according to claim 22, further comprising:
provided the braking torque variable is greater than the comparative variable, controlling at least one wheel inlet valve of the brake circuit into a closed state such that a hydraulic connection between the main brake cylinder and at least one wheel brake caliper of the brake circuit, by the at least one wheel inlet valve controlled into the closed state, is prevented.

### Claim 24 (depends on 22)

The method according to claim 22, further comprising:
establishing the generator braking torque of the generator that is to be exerted while taking into account an operating force variable (x(t)) with respect to an operating force of an operation of a brake operating element of the brake system and/or a generator information (b(t)) with respect to at least one optional braking torque that is able to be exerted; and
actuating the generator corresponding to the established generator braking torque that is to be exerted.

### Claim 25 (depends on 24)

The method according to claim 24, further comprising:
provided an increased operating force variable ((x(t)) is detected, comparing the increased operating force variable (x(t)) to a threshold value (xmin) with respect to a least operating force as of which a driver braking force applied to the brake operating element is transmitted to an adjustable main brake cylinder piston of the main brake cylinder; and
provided the increased operating force variable (x(t)) exceeds the threshold value (xmin), holding constant or reducing the generator braking torque to be exerted in spite of the increased operating force variable (x(t)).

### Claim 26 (depends on 22)

The method according to claim 22, further comprising:
provided the currently exerted or to be exerted generator braking torque decreases over time, controlling a pump of the brake circuit, which is adapted to pump the brake fluid from the storage chamber of the brake circuit to at least one wheel brake caliper of the brake circuit, from an inactive pumping mode to an active pumping mode.