# US 11,305,773 B1 · Powertrain to friction brake standstill handoff for one pedal drive > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,305,773 B1 - Document ID: US11305773B1 - Status: Granted - Kind: B1 - Application number: 17/035,468 - Filed: 2020-09-28 - Published: 2022-03-31 - Granted: 2022-04-19 - Earliest claimed: 2020-09-28 - Assignees: Ford Global Technologies, LLC - Applicants: Ford Global Technologies, LLC - Inventors: Sergey Gennadievich Semenov; Bryan Michael Bolger; Angel Fernando Porras; Devin James O'Donnell; Dale Scott Crombez; Alexander McCollough - Web page: https://patentgrep.com/patent/US11305773B1 ## CPC - B60T 13/74: with electrical assistance or drive - B60W 30/18127: {Regenerative braking} - B60L 7/26: Controlling the braking effect - B60T 1/10: by utilising wheel movement for accumulating energy, e.g. driving air compressors - B60T 7/042: {by electrical means, e.g. using travel or force sensors} - B60T 8/3215: {Systems characterised by having means acting on components of the drive line, e.g. retarder, clutch or differential gear (B60T8/322 takes precedence)} - B60T 13/586: {the retarders being of the electric type} - B60T 13/662: {characterised by specified functions of the control system components} - B60W 10/08: including control of electric propulsion units, e.g. motors or generators - B60W 10/184: with wheel brakes - B60W 10/196: acting within the driveline, e.g. retarders - B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)} - B60W 30/18118: {Hill holding} - F16D 61/00: Brakes with means for making the energy absorbed available for use (F16D57/00 takes precedence) - B60L 2240/12: Speed - B60L 2240/26: Vehicle weight - B60L 2240/642: Slope of road - B60L 2250/28: Accelerator pedal thresholds - B60T 2201/04: Hill descent control - B60T 2210/20: Road shapes - B60T 2220/04: Pedal travel sensor, stroke sensor; Sensing brake request - B60T 2250/02: Vehicle mass - B60T 2250/04: Vehicle reference speed; Vehicle body speed - B60T 2270/604: Merging friction therewith; Adjusting their repartition - B60T 2270/82: Brake-by-Wire, EHB - B60T 2270/89: Criteria for brake release - B60W 2510/182: Brake pressure, e.g. of fluid or between pad and disc - B60W 2520/10: Longitudinal speed - B60W 2530/10: Weight - B60W 2540/10: Accelerator pedal position - B60W 2540/12: Brake pedal position - B60W 2552/15: Road slope, i.e. the inclination of a road segment in the longitudinal direction - B60W 2710/083: Torque - B60W 2710/18: Braking system - 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 - 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 - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES ## Abstract A method for controlling a vehicle includes monitoring the vehicle speed for a first threshold in conjunction with a driver request for negative torque, after which the method comprises increasing a friction braking ratio. The method further comprises monitoring the speed of the vehicle for a second threshold, wherein the second threshold is lower than the first, after which the method comprises solely using the friction braking for braking holding torque. ## Claims ### Claim 1 A vehicle comprising: an electric machine; friction brakes; and a controller programmed to operate the electric machine to selectively regeneratively brake the vehicle based on driver accelerator pedal input, and responsive to a speed of the vehicle achieving or becoming less than a speed threshold, apply the friction brakes at a holding torque value in an absence of brake pedal input such that when the speed is zero, the friction brakes are active, wherein the speed threshold depends on road grade such that the speed threshold increases as the road grade increases. ### Claim 2 (depends on 1) The vehicle of claim 1, wherein the controller is further programmed to, responsive to the speed being zero, the friction brakes being active, and the driver accelerator pedal input being indicative of a request for forward movement, release the friction brakes after the electric machine produces a propulsion torque value at least equal to the holding torque value. ### Claim 3 (depends on 1) The vehicle of claim 1, wherein the controller is further programmed to, responsive to the speed being less than a first speed value, and greater than a second speed value, apply the friction brakes according to a brake ramp schedule. ### Claim 4 (depends on 3) The vehicle of claim 3, wherein the brake ramp schedule depends on the road grade or weight of the vehicle. ### Claim 5 (depends on 1) The vehicle of claim 1, wherein the speed threshold has a minimum value of zero. ### Claim 6 (depends on 1) The vehicle of claim 1, wherein the speed threshold further depends on a weight of the vehicle. ### Claim 7 A method for controlling speed of a vehicle, the method comprising: in response to an input indicating one pedal drive mode being enabled, operating an electric machine to selectively brake the vehicle based on driver accelerator input, and in further response to the vehicle speed becoming less than a speed threshold during an absence of brake pedal input, applying a holding torque value via friction brakes, wherein the speed threshold depends on road grade such that the speed threshold increases as the road grade increases. ### Claim 8 (depends on 7) The method of claim 7 further comprising, responsive to the speed being zero, the friction brakes being active, and the driver accelerator pedal input being indicative of a request for forward movement, releasing the friction brakes after the electric machine produces a propulsion torque value at least equal to the holding torque value. ### Claim 9 (depends on 7) The method of claim 7 further comprising, responsive to the speed being less than a first speed value, and greater than a second threshold, applying the friction brakes according to a brake ramp schedule. ### Claim 10 (depends on 9) The method of claim 9, wherein the brake ramp schedule depends on the road grade or weight of the vehicle. ### Claim 11 (depends on 7) The method of claim 7, wherein the speed threshold has a minimum value of zero. ### Claim 12 (depends on 7) The method of claim 7, wherein the speed threshold further depends on a weight of the vehicle. ### Claim 13 A vehicle comprising: an electric machine; friction brakes; and a controller programmed to, responsive to a speed of the vehicle becoming less than a speed threshold for at least a predefined period of time during an absence of brake pedal input, apply the friction brakes such that when the speed is zero, the friction brakes apply a holding torque value to maintain the speed at zero, wherein the speed threshold depends on road grade such that the speed threshold increases as the road grade increases. ### Claim 14 (depends on 13) The vehicle of claim 13, wherein the controller is further programmed to, responsive to the speed being zero, the friction brakes being active, and driver accelerator pedal input being indicative of a request for forward movement, release the friction brakes after the electric machine produces a propulsion holding torque value at least equal to the holding torque value. ### Claim 15 (depends on 13) The vehicle of claim 13, wherein the predefined period of time depends on road grade or weight of the vehicle. ### Claim 16 (depends on 13) The vehicle of claim 13, wherein the speed threshold has a minimum value of zero. ### Claim 17 (depends on 13) The vehicle of claim 13, wherein the speed threshold further depends on a weight of the vehicle.