# US 10,501,065 B2 · System and method for validating operation of secondary braking system of a vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,501,065 B2 - Document ID: US10501065B2 - Status: Granted - Kind: B2 - Application number: 15/639,652 - Filed: 2017-06-30 - Published: 2019-01-03 - Granted: 2019-12-10 - Earliest claimed: 2017-06-30 - Assignees: Veoneer Nissin Brake Systems Japan Co., Ltd. - Applicants: Autoliv ASP, Inc. - Inventors: Long Ying; Alexandru Versin; Juchirl Park - Web page: https://patentgrep.com/patent/US10501065B2 ## CPC - B60T 17/221: {Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems (hydraulic pressure systems in general F15B19/00, F15B21/04; testing structures or apparatus G01M)} - B60T 8/4081: {Systems with stroke simulating devices for driver input (B60T8/4077 takes precedence)} - B60T 8/88: with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means - B60T 8/885: {using electrical circuitry} - B60T 15/041: {controlling auxiliary pressure brakes, e.g. parking or emergency brakes (B60T15/048 takes precedence)} - B60T 7/22: initiated by contact of vehicle, e.g. bumper, with an external object, e.g. another vehicle {, or by means of contactless obstacle detectors mounted on the vehicle} - B60T 8/17: Using electrical or electronic regulation means to control braking {(detecting or indicating faulty operation B60T8/885)} - B60T 8/34: having a fluid pressure regulator responsive to a speed condition - B60T 8/36: including a pilot valve responding to an electromagnetic force - B60T 8/44: co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device {, i.e. open systems} - B60T 13/20: with control of pump driving means - B60T 13/68: by electrically-controlled valves {(B60T13/662 and B60T13/665 take precedence)} - B60T 2270/402: Back-up - B60T 2270/406: Test-mode; Self-diagnosis - 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 is disclosed for validating operation of a secondary braking system (SBS) of a vehicle having a plurality of brakes, by controlling the SBS and a primary braking system (PBS) of the vehicle. The method may involve using the PBS to generate a first predetermined target braking pressure in the PBS for at least a first one of the brakes, while using the SBS to generate a second predetermined target braking pressure in the SBS for at least a second one of the brakes. Actual and anticipated performance characteristics of a braking component associated with the vehicle are then observed and compared, and from the comparison a determination is made whether the SBS is operating properly. ## Claims ### Claim 1 A method for validating operation of a secondary braking system (SBS) of a vehicle having a plurality of brakes, by controlling the SBS and a primary braking system (PBS) of the vehicle, the method comprising: using the PBS to generate a first predetermined target braking pressure in the PBS for at least a first one of the brakes; using the SBS to generate a second predetermined target braking pressure in the SBS for at least a second one of the brakes, while maintaining the first predetermined target braking pressure in the PBS, the second predetermined target braking pressure being higher than the first predetermined target braking pressure; observing an actual performance characteristic associated with a braking component of the vehicle; comparing the actual performance characteristic with an anticipated performance characteristic of the braking component; and when the actual performance characteristic is approximately equal to the anticipated performance characteristic, determining that the SBS is operating properly, and when the actual performance characteristic is not approximately equal to the anticipated performance characteristic, determining that the SBS is not operating properly. ### Claim 2 (depends on 1) The method of claim 1, wherein comparing the actual performance characteristic with an anticipated performance characteristic comprises comparing the actual performance characteristic with a known, predetermined performance characteristic, wherein the known, predetermined performance characteristic is determined during testing and/or calibration of the PBS and SBS systems. ### Claim 3 (depends on 2) The method of claim 2, wherein the known, predetermined performance characteristic is a predetermined amount of hydraulic braking fluid displaced from a slave cylinder of the PBS when the second predetermined target braking pressure is reached. ### Claim 4 (depends on 1) The method of claim 1, wherein determining an actual performance characteristic comprises determining an actual amount of hydraulic braking fluid that is displaced from a braking component of the PBS when the second predetermined target braking pressure is reached in the SBS. ### Claim 5 (depends on 4) The method of claim 4, wherein the braking component is a slave cylinder of the PBS. ### Claim 6 (depends on 1) The method of claim 1, wherein the actual performance characteristic and the anticipated performance characteristic are obtained by monitoring a travel of a piston of a slave cylinder of the PBS. ### Claim 7 (depends on 1) The method of claim 1, wherein using the SBS to generate a second predetermined target braking pressure comprises using an electronic control unit (ECU) of the SBS to control operation of the SBS to achieve the second predetermined target braking pressure. ### Claim 8 (depends on 1) The method of claim 1, wherein using the PBS to generate a first predetermined target braking pressure comprises using an electronic control unit (ECU) of the PBS to achieve the first predetermined target braking pressure. ### Claim 9 (depends on 1) The method of claim 1, wherein using the SBS to generate a second predetermined target braking pressure comprises using at least one isolation valve in the SBS to help control fluid flow leaving the second one of the brakes. ### Claim 10 (depends on 9) The method of claim 9, wherein using the SBS to generate a second predetermined target braking pressure comprises: using a motor in the SBS to drive a pump in the SBS, the pump operating to help build fluid pressure in a fluid line associated with the second one of the brakes; and using an electronic control unit (ECU) in the SBS to control operation of the motor. ### Claim 11 (depends on 1) The method of claim 1, wherein using the SBS to generate a second predetermined target braking pressure for at least one of the brakes while maintaining the first predetermined target braking pressure in the PBS, comprises using a pair of isolation valves of the SBS, with the pair of isolation valves being associated with the second one of the brakes and a third one of the brakes. ### Claim 12 (depends on 1) The method of claim 1, wherein the anticipated performance characteristic is stored in a memory associated with an electronic control unit (ECU), and where the ECU forms a portion of at least one of the PBS or the SBS. ### Claim 13 (depends on 1) The method of claim 1, further comprising using a pressure sensor operably associated with the PBS to sense the first predetermined target braking pressure developed in the PBS. ### Claim 14 (depends on 1) The method of claim 1, wherein: the PBS monitors and controls the first predetermined braking pressure; the SBS monitors and controls the second predetermined braking pressure; and wherein the PBS and SBS operate in parallel.