# US 9,517,770 B2 · Brake control for stop/start vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,517,770 B2 - Document ID: US9517770B2 - Status: Granted - Kind: B2 - Application number: 14/339,887 - Filed: 2014-07-24 - Published: 2016-01-28 - Granted: 2016-12-13 - Earliest claimed: 2014-07-24 - Assignees: Ford Global Technologies, LLC - Applicants: Ford Global Technologies, LLC - Inventors: Hai Yu - Web page: https://patentgrep.com/patent/US9517770B2 ## CPC - B60W 30/18118: {Hill holding} - B60T 7/12: for automatic initiation; for initiation not subject to will of driver or passenger {(limiting speed of vehicles other than rail vehicles B60K31/00)} - B60T 7/122: {for locking of reverse movement} - B60W 10/06: including control of combustion engines - B60W 10/182: {including control of parking brakes} - B60W 10/184: with wheel brakes - B60W 10/188: hydraulic brakes - B60W 10/30: including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps - B60W 30/18018: {Start-stop drive, e.g. in a traffic jam} - B60W 30/18027: {Drive off, accelerating from standstill} - F02D 11/02: characterised by hand, foot, or like operator controlled initiation means - F02N 11/0822: {related to action of the driver} - B60T 2201/06: Hill holder; Start aid systems on inclined road - B60W 2510/182: Brake pressure, e.g. of fluid or between pad and disc - B60W 2510/186: Status of parking brakes - B60W 2510/244: Charge state - B60W 2540/103: Accelerator thresholds, e.g. kickdown - B60W 2540/12: Brake pedal position - B60W 2710/0666: Engine torque - B60W 2710/182: Brake pressure, e.g. of fluid or between pad and disc - F02N 2200/0801: Vehicle speed - F02N 2200/101: Accelerator pedal position - F02N 2200/102: Brake pedal position - Y02T 10/40: Engine management systems - 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 - 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 - F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W) - F02N: STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A vehicle is provided with an engine and a controller. The engine is adapted to shutdown and restart during a drive cycle and a controller. The controller is programmed to shutdown the engine in response to brake pressure exceeding a pressure threshold and to restart the engine in response to an accelerator pedal position exceeding a position threshold independent of brake pressure. ## Claims ### Claim 1 A vehicle comprising: an engine adapted to shutdown and restart during a drive cycle; a first brake system adapted to generate a first brake torque; a second brake system adapted to generate a second brake torque; and a controller programmed to: shutdown the engine in response to brake pressure exceeding a pressure threshold; restart the engine in response to an accelerator pedal position exceeding a position threshold independent of brake pressure; decrease the first brake torque and decrease the second brake torque in response to an engine restart; and increase the first brake torque to a torque threshold in response to the brake pressure decreasing below the pressure threshold, wherein the torque threshold and the pressure threshold correspond to brake conditions at which the engine was shutdown. ### Claim 2 (depends on 1) The vehicle of claim 1 wherein the first brake system comprises an electric brake pump coupled to a hydraulic brake system and the second brake system comprises an electric park brake coupled to at least one brake caliper, and wherein the controller is further programmed to restart the engine in response to the electric park brake being applied and the accelerator pedal position exceeding the position threshold. ### Claim 3 (depends on 1) The vehicle of claim 1 wherein the controller is further programmed to: increase the first brake torque to a torque threshold in response to an engine shutdown; and release the first brake system and increase the second brake torque to the torque threshold in response to a battery voltage decreasing below a voltage threshold, wherein the torque threshold corresponds to brake torque at which the engine was shutdown. ### Claim 4 (depends on 3) The vehicle of claim 3 wherein the controller is further programmed to maintain a total brake torque above the torque threshold while increasing the second brake torque and decreasing the first brake torque in response to the battery voltage decreasing below the voltage threshold, wherein the total brake torque is equal to a sum of the first brake torque and the second brake torque. ### Claim 5 (depends on 3) The vehicle of claim 3 wherein the controller is further programmed to restart the engine in response to the battery voltage decreasing below a second voltage threshold, wherein the second voltage threshold is less than the voltage threshold. ### Claim 6 A vehicle system comprising: a first brake system adapted to generate a first brake torque; a second brake system adapted to generate a second brake torque; and a controller programmed to: increase the first brake torque to a torque threshold in response to engine shutdown, decrease the first brake torque and increase the second brake torque in response to a battery voltage decreasing below a voltage threshold, and release the first and second brake systems responsive to an engine restart. ### Claim 7 (depends on 6) The vehicles system of claim 6 wherein the controller is further programmed to maintain a total brake torque above the torque threshold while increasing the second brake torque and decreasing the first brake torque in response to the battery voltage decreasing below the voltage threshold, wherein the total brake torque is equal to a sum of the first brake torque and the second brake torque. ### Claim 8 (depends on 6) The vehicle system of claim 6 wherein the controller is further programmed to restart the engine in response to the battery voltage decreasing below a second voltage threshold, wherein the second voltage threshold is less than the voltage threshold. ### Claim 9 (depends on 6) The vehicle system of claim 6 wherein the controller is further programmed to decrease the first brake torque and increase the second brake torque in response to a change in brake pressure exceeding a pressure loss threshold. ### Claim 10 (depends on 6) The vehicle system of claim 6 wherein the first brake system comprises an electric brake pump coupled to a hydraulic brake system and the second brake system comprises an electric park brake coupled to at least one brake caliper. ### Claim 11 A method for controlling brake systems, comprising: shutting down an engine responsive to brake pressure exceeding a pressure threshold; controlling a first brake system to increase a first brake torque above a torque threshold in response to engine shutdown; and controlling the first brake system to decrease the first brake torque and controlling a second brake system to increase a second brake torque in response to a battery voltage decreasing below a voltage threshold. ### Claim 12 (depends on 11) The method of claim 11 further comprising maintaining a total brake torque above the torque threshold while increasing the second brake torque and decreasing the first brake torque in response to the battery voltage decreasing below the voltage threshold, wherein the total brake torque is equal to a sum of the first brake torque and the second brake torque. ### Claim 13 (depends on 11) The method of claim 11 further comprising restarting the engine and decreasing the second brake torque in response to the battery voltage decreasing below a second voltage threshold, wherein the second voltage threshold is less than the voltage threshold. ### Claim 14 (depends on 11) The method of claim 11 further comprising decreasing the first brake torque and increasing the second brake torque to the torque threshold in response to a change in brake pressure exceeding a pressure loss threshold. ### Claim 15 (depends on 11) The method of claim 11 further comprising restarting the engine in response to an accelerator pedal position exceeding a position threshold and independent of brake pressure. ### Claim 16 (depends on 11) The method of claim 11 further comprising decreasing the first brake torque and the second brake torque in response to an engine restart.