# US 12,600,332 B2 · Vehicle braking system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,600,332 B2 - Document ID: US12600332B2 - Status: Granted - Kind: B2 - Application number: 17/614,213 - Filed: 2020-04-29 - Published: 2022-07-14 - Granted: 2026-04-14 - Earliest claimed: 2019-05-28 - Assignees: Haldex Aktiebolag - Applicants: Haldex Brake Products AB - Inventors: Dudley John Harrison - Web page: https://patentgrep.com/patent/US12600332B2 ## CPC - B60T 8/885: {using electrical circuitry} - B60T 17/22: Devices for monitoring or checking brake systems; Signal devices - B60T 13/683: {in pneumatic systems or parts thereof (in vacuum systems B60T13/72)} - 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 2270/402: Back-up - B60T 2270/406: Test-mode; Self-diagnosis - B60T 2270/413: Plausibility monitoring, cross check, redundancy - B60T 2270/88: Pressure measurement in brake systems - 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 vehicle braking system which includes at least one primary feature and at least one redundant feature and a braking control system which is operable to determine whether a predetermined condition, which is not indicative of failure of the primary feature or the redundant feature, is met, wherein if the predetermined condition is met, the braking control system causes the primary feature to be operable and if the predetermined condition is not met, the braking control system causes the redundant feature to be operable. ## Claims ### Claim 1 A method of controlling a vehicle braking system which includes at least one primary feature and at least one redundant feature and a braking control system which is operable to determine whether a predetermined condition is met, wherein if the predetermined condition is met, the braking control system causes the primary feature to be operable and if the predetermined condition is not met, the braking control system causes the redundant feature to be operable, wherein the predetermined condition is a required braking pressure, and is not indicative of failure of the primary feature or the redundant feature, wherein, in the event of a predetermined number of braking applications being made without the redundant feature being operable, the braking control system causes the redundant feature to be operated on the next braking application, regardless of whether the predetermined condition is or is not met. ### Claim 2 (depends on 1) The method according to claim 1, wherein the redundant feature is not a substantially identical duplicate of the primary feature. ### Claim 3 (depends on 1) The method according to claim 1, wherein the braking control system monitors for failure of the primary feature and redundant feature and prevents operation of a failed feature, regardless of whether or not the predetermined condition is met. ### Claim 4 (depends on 1) The method according to claim 1, including selecting the predetermined condition to be likely to be met in approximately 50% of braking applications. ### Claim 5 (depends on 1) The method according to claim 1, including the braking control system monitoring the frequency of use of the redundant feature relative to the use of the primary feature. ### Claim 6 A vehicle braking system including at least one primary feature and at least one redundant feature and a braking control system which is operable to determine whether a predetermined condition is met, wherein if the predetermined condition is met, the braking control system causes the primary feature to be operable and if the predetermined condition is not met, the braking control system causes the redundant feature to be operable, wherein the predetermined condition is a required braking pressure, and is not indicative of failure of the primary feature or the redundant feature, wherein, in the event of a predetermined number of braking applications being made without the redundant feature being operable, the braking control system causes the redundant feature to be operated on the next braking application, regardless of whether the predetermined condition is or is not met. ### Claim 7 (depends on 6) The vehicle braking system according to claim 6, including a plurality of primary features and a plurality of redundant features. ### Claim 8 (depends on 6) The vehicle braking system according to claim 6, wherein the braking control system is operable to determine the frequency of use of the redundant feature relative to the primary feature. ### Claim 9 (depends on 6) The vehicle braking system according to claim 6, wherein the primary feature includes an Electronic Control Unit (ECU). ### Claim 10 (depends on 6) The vehicle braking system according to claim 6, wherein the or each redundant feature is not a substantially identical duplicate of the primary feature for which it provides redundancy. ### Claim 11 (depends on 6) The vehicle braking system according to claim 6, wherein the primary feature includes a supply line for the supply of pressurised fluid from one or more sources of pressurised fluid. ### Claim 12 (depends on 6) The vehicle braking system according to claim 6, wherein the primary feature includes a control valve to control the flow of fluid from a source(s) of pressurised fluid to a modulator. ### Claim 13 (depends on 6) The vehicle braking system according to claim 6, wherein the primary feature includes a modulator. ### Claim 14 (depends on 6) The vehicle braking system according to claim 6, wherein the primary feature includes one or more internal features of a modulator valve(s). ### Claim 15 (depends on 6) The vehicle braking system according to claim 6, wherein the primary feature includes a build valve. ### Claim 16 (depends on 6) The vehicle braking system according to claim 6, wherein the primary feature includes a dump valve. ### Claim 17 (depends on 6) The vehicle braking system according to claim 6, wherein the primary feature includes a pneumatic control line.