# US 10,246,067 B2 · Brake system and method for operating a brake system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,246,067 B2 - Document ID: US10246067B2 - Status: Granted - Kind: B2 - Application number: 15/661,928 - Filed: 2017-07-27 - Published: 2017-11-09 - Granted: 2019-04-02 - Earliest claimed: 2016-01-19 - Assignees: Continental Teves AG & Co. oHG - Applicants: Continental Teves AG & Co. oHG - Inventors: Dieter Burkhard - Web page: https://patentgrep.com/patent/US10246067B2 ## CPC - B60T 8/4054: {involving the delivery pressure control (B60T8/4072 takes precedence)} - B60T 8/172: Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters {(B60T8/17551 takes precedence)} - B60T 8/1761: responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure - B60T 8/3275: {Systems with a braking assistant function, i.e. automatic full braking initiation in dependence of brake pedal velocity} - B60T 8/4077: {Systems in which the booster is used as an auxiliary pressure source} - B60T 8/4081: {Systems with stroke simulating devices for driver input (B60T8/4077 takes precedence)} - B60T 13/686: {in hydraulic systems or parts thereof} - B60T 13/745: {acting on a hydraulic system, e.g. a master cylinder} - 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 method for operating a brake system for motor vehicles comprises in a normal control mode of the system, a displacement of a piston for a pressure supply device is terminated, and inlet valves of the wheel brakes are closed in the event of a specified brake condition. The normal control mode is switched to a special control mode in the event of a specified condition for the pressure supply device. In the event of the specified brake condition in the special control mode, a displacement of the piston of the pressure supply device is terminated by outputting an actuation signal to the pressure supply device, and for at least one selected wheel brake, the corresponding inlet valve is kept open and the corresponding outlet valve is opened at least temporarily while the inlet valves of the remaining wheel brakes are closed. ## Claims ### Claim 1 A method for operating a slip-controlled brake system for motor vehicles comprising: connecting a plurality of wheel brakes to a pressure supply device via a plurality of electrically actuated normally open inlet valves, each associated with one of the plurality of wheel brakes; connecting the plurality of wheel brakes to a pressure medium storage container at atmospheric pressure via a plurality electrically actuated normally closed outlet valves, each associated with one of the plurality of wheel brakes; displacing a piston of a cylinder-piston assembly with an electromechanical actuator, wherein an electrically controlled pressure supply device is formed by the piston which at least partially defines at least one hydraulic pressure chamber; determining when a first predetermined braking condition exists in a normal control mode of the brake system; outputting an actuation signal to the pressure supply device to close the plurality of inlet valves of the wheel brakes when the first predetermined braking conditions exists in the normal control mode thereby terminating a displacement of the piston of the pressure supply device; determining when a second predetermined braking condition exists in a normal control mode of the brake system; changing the normal control mode to a special control mode when the second predetermined braking condition for the pressure supply device exists; determining when the first predetermined braking condition exists in the special control mode of the brake system; outputting an actuation signal to the pressure supply device to return at least one of the plurality of the inlet valves to normally opened when the first predetermined braking condition exists in the special control mode, thereby terminating a displacement of the piston of the pressure supply device; opening at least one of the plurality of outlet valves associated with a same wheel brake as the least one inlet valve at least temporarily when the first predetermined braking condition exists in the special control mode; and closing a remaining of the plurality of inlet valves when an estimated volume of pressure medium has been discharged through the at least one outlet valve. ### Claim 2 (depends on 1) The method of claim 1, wherein the at least one inlet valve which is not closed and the at least one of the plurality of outlet valves which are at least temporarily opened are inlet valves and outlet valve for rear axle wheel brakes. ### Claim 3 (depends on 1) The method of claim 1, further comprising estimating a pressure medium volume by determining how much volume of pressure medium is displaced from the pressure supply device following outputting of the actuation signal until one of: the piston of the pressure supply device comes to a standstill and the second predetermined braking condition for the pressure supply device is no longer met. ### Claim 4 (depends on 3) The method of claim 3, wherein determining at least one opening time for the at least one outlet valve using the estimated pressure medium volume. ### Claim 5 (depends on 3) The method of claim 3, further comprising: closing again the at least one outlet valve when the estimated pressure medium volume has been discharged through the at least one outlet valve; and closing the at least one inlet valve when the estimated pressure medium volume has been discharged through the at least one outlet valve. ### Claim 6 (depends on 1) The method of claim 1, further comprising changing from the special control mode to the normal control mode when the second predetermined condition for the pressure supply device is no longer met. ### Claim 7 (depends on 1) The method of claim 1, wherein the first predetermined braking condition is a termination of a build-up of pressure at each of the wheel brakes demanded by an anti-lock control function of the brake system. ### Claim 8 (depends on 1) The method of claim 1, wherein the second predetermined condition for the pressure supply device is a critical operating state of the pressure supply device detected using a speed of the pressure supply device. ### Claim 9 (depends on 8) The method of claim 8, wherein the second predetermined condition is detected using a position of the pressure supply device. ### Claim 10 A control and regulating unit for a brake system with instructions for: connecting a plurality of wheel brakes to a pressure supply device via an electrically actuate a plurality of normally open inlet valves, each associated with one of the plurality of wheel brakes; connecting the plurality of wheel brakes to a pressure medium storage container at atmospheric pressure via a plurality of electrically actuated normally closed outlet valves, each associated with one of the plurality of wheel brakes; displacing a piston of a cylinder-piston assembly with an electromechanical actuator, wherein an electrically controlled pressure supply device is formed by the piston which at least partially defines at least one hydraulic pressure chamber; determining when a first predetermined braking condition exists in a normal control mode of the brake system; outputting an actuation signal to the pressure supply device to close the plurality of inlet valves when the first predetermined braking conditions exists in the normal control mode thereby terminating a displacement of the piston of the pressure supply device; determining when a second predetermined braking condition exists in a normal control mode of the brake system; changing the normal control mode to a special control mode when the second predetermined braking condition for the pressure supply device exists; determining when the first predetermined braking condition exists in the special control mode of the brake system; outputting an actuation signal to the pressure supply device to return at least one of the plurality of inlet valves of the wheel brakes to normally opened when the first predetermined braking condition exists in the special control mode, thereby terminating a displacement of the piston of the pressure supply device; opening eat least one of the plurality of outlet valves at least temporarily when the first predetermined braking condition exists in the special control mode, wherein the at least one outlet valve is associated with the same wheel brake as the least one inlet valve; and closing a remaining of the plurality of inlet valves when an estimated volume of pressure medium has been discharged through the at least one outlet valve. ### Claim 11 A slip-controlled brake system for motor vehicles comprising: an electrically controlled pressure supply device; a piston of a cylinder-piston assembly which is displaceable with an electromechanical actuator wherein at least partially defines at least one hydraulic pressure chamber; a plurality of electrically actuated normally open inlet valves which each connect at least one of a plurality of wheel brakes to the pressure supply device; a plurality of electrically actuated normally closed outlet valve which each connect at least one of a plurality of wheel brakes to a pressure medium storage container at atmospheric pressure; a normal control mode of the brake system, wherein a displacement of the piston of the pressure supply device is terminated by outputting an actuation signal to the pressure supply device and the plurality of inlet valves of the wheel brakes are closed when a first predetermined braking condition is met; a special control mode, wherein the normal control mode is changed to the special control mode when a second predetermined condition is met; wherein a displacement of the piston is terminated when the first predetermined braking condition is met in the special control mode by outputting an actuation signal to the pressure supply device, and the at least one of the plurality of inlet valves is held open for at least one of the plurality of wheel brakes and at least one of the plurality of outlet valves is at least temporarily opened, wherein the at least one outlet valve is associated with same wheel brake as the least one inlet valve; and wherein a remaining of the plurality of inlet valves are closed when the estimated volume of pressure medium has been discharged through the at least one outlet valve when the first predetermined braking condition is met in the special control mode. ### Claim 12 (depends on 11) The system of claim 11, wherein the at least one inlet valve which is not closed and the at least one outlet valve which is at least temporarily opened are inlet valves and outlet valves for rear axle wheel brakes. ### Claim 13 (depends on 11) The system of claim 11, wherein a pressure medium volume is estimated based upon how much volume of pressure medium is displaced from the pressure supply device following the output of the actuation signal until one of: the piston of the pressure supply device comes to a standstill and the second predetermined condition for the pressure supply device is no longer met. ### Claim 14 (depends on 13) The system of claim 13, wherein at least one opening time for the at least one outlet valve is determined using the estimated pressure medium volume. ### Claim 15 (depends on 13) The system of claim 13, wherein the at least one outlet valve is closed when the estimated pressure medium volume has been discharged through the at least one outlet valve and the at least one inlet valve is closed when the estimated pressure medium volume has been discharged through the at least one outlet valve. ### Claim 16 (depends on 11) The system of claim 11, wherein the control mode is changed from the special control mode to the normal control mode when the second predetermined condition for the pressure supply device is no longer met. ### Claim 17 (depends on 11) The system of claim 11, wherein the first predetermined braking condition is a termination of a build-up of pressure at each of the wheel brakes demanded by an anti-lock control function of the brake system. ### Claim 18 (depends on 11) The system of claim 11, wherein the second predetermined condition for the pressure supply device is a critical operating state of the pressure supply device detected using a speed of the pressure supply device. ### Claim 19 (depends on 18) The system of claim 18, wherein the second predetermined condition is detected using a position of the pressure supply device.