# US 10,370,000 B2 · Method for creep cancellation in hybrid drivelines > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,370,000 B2 - Document ID: US10370000B2 - Status: Granted - Kind: B2 - Application number: 15/351,568 - Filed: 2016-11-15 - Published: 2018-05-17 - Granted: 2019-08-06 - Earliest claimed: 2016-11-15 - Assignees: Ford Global Technologies, LLC - Applicants: Ford Global Technologies, LLC - Inventors: Rajit Johri; Francis Thomas Connolly; Fazal Urrahman Syed; Minku Lee; Mark Steven Yamazaki - Web page: https://patentgrep.com/patent/US10370000B2 ## CPC - B60W 20/10: Controlling the power contribution of each of the prime movers to meet required power demand - B60W 30/18063: {Creeping} - B60W 10/026: {of lock-up clutches} - B60W 10/08: including control of electric propulsion units, e.g. motors or generators - B60W 10/184: with wheel brakes - B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)} - F16H 61/48: hydrodynamic - B60K 2006/4825: {Electric machine connected or connectable to gearbox input shaft} - B60W 2540/10: Accelerator pedal position - B60W 2540/12: Brake pedal position - B60W 2710/028: Clutch input shaft speed - B60W 2710/081: Speed - B60Y 2300/18058: Creeping - Y02T 10/62: Hybrid vehicles - Y10S 903/93: Conjoint control of different elements - Y10S 903/946: Characterized by control of driveline clutch - Y10S 903/947: Characterized by control of braking, e.g. blending of regeneration, friction braking - 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 - F16H: GEARING - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract According to one embodiment of this disclosure, a vehicle having an electric machine and at least one controller is described. The electric machine may be configured to generate creep torque to move the vehicle. The controller may be programmed to decrease a target speed of a torque converter impeller to create a desired brake torque and partially cancel the creep torque without application of friction brakes in response to a brake pedal being pressed while an accelerator pedal is not being pressed. ## Claims ### Claim 1 A vehicle comprising: an electric machine configured to generate creep torque to move the vehicle; and at least one controller programmed to decrease a target speed of a torque converter impeller by a first predetermined amount to create a desired brake torque and partially cancel the creep torque without application of friction brakes in response to a brake pedal being pressed by first predetermined distance while an accelerator pedal is not being pressed, and wherein the first predetermined amount is based on the first predetermined distance. ### Claim 2 (depends on 1) The vehicle of claim 1, wherein the at least one controller is further programmed to reduce a speed of the electric machine to zero in response to the brake pedal being pressed beyond a threshold. ### Claim 3 (depends on 1) The vehicle of claim 1, further comprising an internal combustion engine operatively coupled to the electric machine by a disconnect clutch, wherein the at least one controller is further programmed to limit the decrease such that the target speed does not fall below a threshold that is defined by a speed of the internal combustion engine. ### Claim 4 (depends on 3) The vehicle of claim 3, further comprising a transmission operatively coupled between the internal combustion engine and the electric machine, wherein the transmission has a torque ratio of an input torque divided by an output torque and wherein an amount of the decrease is at least partially based on the torque ratio of the transmission. ### Claim 5 (depends on 4) The vehicle of claim 4, further comprising at least two wheels and a final drive operatively coupled to the at least two wheels and the transmission, wherein the final drive includes at least two gears that define a final drive ratio and wherein an amount of the decrease is based on the final drive ratio. ### Claim 6 (depends on 1) The vehicle of claim 1, wherein an amount of the decrease is based on a speed of the torque converter impeller divided by a speed of torque converter turbine. ### Claim 7 A method for a hybrid vehicle comprising: reducing, by a controller, a target speed of a torque converter impeller to create a desired brake torque and partially cancel creep torque without application of friction brakes in response to a brake pedal being pressed while an accelerator pedal is not being pressed. ### Claim 8 (depends on 7) The method of claim 7, further comprising reducing a speed of an electric machine to zero in response to the brake pedal being pressed. ### Claim 9 (depends on 7) The method of claim 7, wherein the reducing is based upon oil viscosity. ### Claim 10 (depends on 7) The method of claim 7, wherein the reducing is based upon a torque ratio of a transmission. ### Claim 11 (depends on 7) The method of claim 7, wherein the partial cancellation of the creep torque results in a decrease in speed of the vehicle. ### Claim 12 (depends on 11) The method of claim 11, further comprising engaging friction brakes to hold the vehicle. ### Claim 13 A system for a vehicle comprising: an electric machine configured to generate creep torque; and at least one controller programmed to decrease a target speed of a torque converter impeller from an impeller idle speed to a minimum speed to create a desired brake torque and partially cancel creep torque without application of friction brakes in response to a brake pedal being pressed by a predetermined distance while an accelerator pedal is not being pressed, wherein a difference between the impeller idle speed and the minimum speed is based on the predetermined distance. ### Claim 14 (depends on 13) The system of claim 13 further comprising an internal combustion engine, wherein the impeller idle speed is equal to an idle speed of the internal combustion. ### Claim 15 (depends on 14) The system of claim 14, wherein the impeller idle speed is at least based upon an engine coolant temperature. ### Claim 16 (depends on 13) The system of claim 13, wherein the target speed is based upon a target impeller torque. ### Claim 17 (depends on 16) The system of claim 16 further comprising a transmission defining a torque ratio, wherein the target impeller torque is at least based upon the torque ratio. ### Claim 18 (depends on 16) The system of claim 16, wherein the target speed of the torque converter impeller is at least based upon a desired brake torque measured at a wheel.