# US 10,479,336 B2 · Vehicle brake system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,479,336 B2 - Document ID: US10479336B2 - Status: Granted - Kind: B2 - Application number: 15/735,635 - Filed: 2015-07-16 - Published: 2018-06-21 - Granted: 2019-11-19 - Earliest claimed: 2015-07-16 - Assignees: Volvo Construction Equiptment AB - Applicants: Volvo Construction Equipment AB - Inventors: Johan Abrahamsson - Web page: https://patentgrep.com/patent/US10479336B2 ## CPC - B60T 13/20: with control of pump driving means - B60T 13/22: Brakes applied by springs or weights and released hydraulically - B60T 13/261: {systems with both indirect application and application by springs or weights and released by compressed air} - B60T 13/662: {characterised by specified functions of the control system components} - B60T 13/683: {in pneumatic systems or parts thereof (in vacuum systems B60T13/72)} - B60T 13/686: {in hydraulic systems or parts thereof} - B60T 17/02: Arrangements of pumps or compressors, or control devices therefor - 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 The invention provides a vehicle brake system including a brake assembly providing a service brake and a parking brake having a brake disc assembly in common, a service brake circuit, a parking brake circuit, and a brake control arrangement adapted to control the service brake by selectively providing a fluid communication between a pressurising arrangement and the service brake via the service brake circuit, the brake control arrangement further being adapted to control the parking brake by selectively providing a fluid communication between the pressurising arrangement and the parking brake via the parking brake circuit, and by selectively draining the parking brake circuit, wherein the vehicle brake system includes a draining circuit adapted to drain the service brake circuit to avoid overload of the brake disc assembly. ## Claims ### Claim 1 A vehicle brake system comprising a brake assembly providing a service brake and a parking brake having a brake disc assembly in common, a service brake circuit, a parking brake circuit, and a brake control arrangement adapted to control the service brake by selectively providing a fluid communication between a pressurising arrangement and the service brake via the service brake circuit, the brake control arrangement further being adapted to control the parking brake by selectively providing a fluid communication between the pressurising arrangement and the parking brake via the parking brake circuit, and by selectively draining the parking brake circuit, wherein the vehicle brake system comprises a draining circuit adapted to drain the service brake circuit to avoid overload of the brake disc assembly, and wherein the draining circuit is adapted to drain the service brake circuit while the parking brake circuit is drained. ### Claim 2 (depends on 1) A vehicle brake system according to claim 1, wherein the parking brake is spring load activated and fluid pressure released. ### Claim 3 (depends on 1) A vehicle brake system according to claim 1, wherein the draining circuit is adapted to drain the service brake circuit via the parking brake circuit. ### Claim 4 (depends on 3) A vehicle brake system according to claim 3, wherein the draining circuit comprises a non-return valve adapted to allow a fluid flow from the service brake circuit to the parking brake circuit, and to prevent a fluid flow from the parking brake circuit to the service brake circuit. ### Claim 5 (depends on 1) A vehicle brake system according to claim 1, wherein the brake control arrangement comprises a service brake control device adapted to selectively provide the fluid communication between the pressurising arrangement and the service brake via the service brake circuit. ### Claim 6 (depends on 5) A vehicle brake system according to claim 5, wherein the parking brake circuit is adapted to provide the fluid communication between the parking brake and the pressurising arrangement independently of the service brake control device. ### Claim 7 (depends on 1) A vehicle brake system according to claim 1, wherein the brake control arrangement comprises a parking brake control arrangement adapted to selectively provide the fluid communication between the pressurising arrangement and the parking brake via the parking brake circuit. ### Claim 8 (depends on 1) A working machine comprising a vehicle brake system according to claim 1. ### Claim 9 (depends on 8) A working machine according to claim 8, in the form a wheel loader or an articulated hauler. ### Claim 10 (depends on 8) A working machine according to claim 8, wherein the working machine is provided with a plurality of wheels, and, at each wheel, an electric propulsion motor for transferring torque to the respective wheel. ### Claim 11 (depends on 10) A working machine according to claim 10, wherein the working machine comprises a series electric hybrid propulsion system, or an electric propulsion system. ### Claim 12 A method for controlling a vehicle brake system comprising a brake assembly providing a service brake and a parking brake having a brake disc assembly in common, a service brake circuit connectable to the service brake, and a parking brake circuit connectable to the parking brake, the method comprising controlling the vehicle brake system so as to assume a first state in which a fluid communication is provided between the parking brake and a pressurising arrangement, for keeping the parking brake released, and controlling the vehicle brake system so as to assume a second state in which the parking brake circuit is drained for applying the parking brake, draining the service brake circuit in the second state for avoiding overload of the brake disc assembly, wherein the service brake circuit is drained while the parking brake circuit is drained. ### Claim 13 (depends on 12) A method according to claim 12, wherein the step of draining the service brake circuit in the second state comprising draining the service brake circuit via the parking brake circuit. ### Claim 14 (depends on 13) A method according to claim 13, wherein allowing a fluid flow from the service brake circuit to the parking brake circuit, and preventing a fluid flow from the parking brake circuit to the service brake circuit. ### Claim 15 (depends on 12) A method according to claim 12, where the vehicle brake system comprises a service brake control device adapted to selectively provide a fluid communication between the pressurising arrangement and the service brake via the service brake circuit, wherein the step of controlling the vehicle brake system so as to assume the first state comprises providing the fluid communication between the parking brake and the pressurising arrangement independently of the service brake control device. ### Claim 16 (depends on 12) A computer comprising a computer program for performing the steps of claim 12 when the program is run on the computer. ### Claim 17 (depends on 12) A non-transitory computer readable medium carrying a computer program for performing the steps of claim 12 when the program is run on a computer. ### Claim 18 A controller for a vehicle brake system, the vehicle brake system comprising a brake assembly providing a service brake and a parking brake having a brake disc assembly in common, a service brake circuit connectable to the service brake, and a parking brake circuit connectable to the parking brake, the controller being configured to control the vehicle brake system so as to assume a first state in which a fluid communication is provided between the parking brake and a pressurising arrangement, for keeping the parking brake released, and to control the vehicle brake system so as to assume a second state in which the parking brake circuit is drained for applying the parking brake, wherein the controller is configured to control the vehicle brake system so that the service brake circuit is drained in the second state for avoiding overload of the brake disc assembly, and wherein the controller is configured to control the vehicle brake system so that the service brake circuit is drained in the second state while the parking brake circuit is drained. ### Claim 19 (depends on 18) A controller according to claim 18, wherein the controller is configured to control the vehicle brake system so that in the second state the service brake circuit is drained via the parking brake circuit.