# US 10,118,605 B2 · Methods and system for a hybrid vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,118,605 B2 - Document ID: US10118605B2 - Status: Granted - Kind: B2 - Application number: 15/457,771 - Filed: 2017-03-13 - Published: 2018-09-13 - Granted: 2018-11-06 - Earliest claimed: 2017-03-13 - Assignees: Ford Global Technologies, LLC - Applicants: Ford Global Technologies, LLC - Inventors: Yanan Zhao; Ming Lang Kuang; Walter Joseph Ortmann - Web page: https://patentgrep.com/patent/US10118605B2 ## CPC - B60W 20/14: in conjunction with braking regeneration - B60K 6/26: characterised by the motors or the generators - B60K 6/36: characterised by the transmission gearings - B60K 6/448: Electrical distribution type - B60K 6/485: Motor-assist type - B60K 6/52: Driving a plurality of drive axles, e.g. four-wheel drive - B60W 10/06: including control of combustion engines - B60W 10/08: including control of electric propulsion units, e.g. motors or generators - B60W 10/11: Stepped gearings - B60W 10/18: including control of braking systems - B60W 30/18109: {Braking} - B60W 30/18127: {Regenerative braking} - B60W 30/18172: {Preventing, or responsive to skidding of wheels} - B60K 2006/4808: {Electric machine connected or connectable to gearbox output shaft} - B60W 2540/12: Brake pedal position - B60W 2710/1005: Transmission ratio engaged - B60W 2720/403: between front and rear axle - B60Y 2200/92: Hybrid vehicles - B60Y 2300/18125: Regenerative braking - B60Y 2300/43: Control of engines - B60Y 2300/91: Battery charging - B60Y 2400/60: Electric Machines, e.g. motors or generators - Y02T 10/62: Hybrid vehicles - Y10S 903/906: Motor or generator - Y10S 903/909: Gearing - 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 - 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 Methods and systems are provided for operating a driveline of a hybrid vehicle that includes an internal combustion engine, a rear drive unit electric machine, an integrated starter/generator, and a transmission are described. In one example, charging of an electric energy storage device may be allocated between the rear drive unit electric machine and the integrated starter/generator to increase charge stored in the electric energy storage device. ## Claims ### Claim 1 A driveline operating method, comprising: charging an electric energy storage device solely via a rear drive unit electric machine in response to a regenerative torque of the rear drive unit electric machine not being substantially equal to a rear drive unit electric machine torque threshold; and charging the electric energy storage device via the rear drive unit electric machine and an integrated starter/generator in response to the regenerative torque of the rear drive unit electric machine being substantially equal to the rear drive unit electric machine torque threshold; wherein the regenerative torque of the rear drive unit electric machine is a greater value of one of a requested braking torque, a battery charging threshold torque, the rear drive unit electric machine torque threshold, and a vehicle stability torque. ### Claim 2 (depends on 1) The method of claim 1, further comprising determining a torque of the integrated starter/generator to an integrated starter/generator regenerative torque determined from subtracting the regenerative torque of the rear drive unit electric machine from a greater value of one of the requested braking torque, the battery charging threshold torque, and the vehicle stability torque. ### Claim 3 (depends on 2) The method of claim 2, further comprising determining a regenerative braking power and producing the regenerative braking power at the integrated starter/generator, the integrated starter/generator coupled to an engine. ### Claim 4 (depends on 3) The method of claim 3, further comprising determining a transmission gear that increases a speed of the integrated starter/generator to a value greater than a desired integrated starter/generator speed. ### Claim 5 (depends on 1) The method of claim 1, where the regenerative torque of the rear drive unit electric machine is determined from a requested braking torque. ### Claim 6 (depends on 1) The method of claim 1, further comprising shifting a transmission gear in response to an absolute value of expected regeneration power of the integrated starter/generator produced at a wheel being greater than or equal to a constant power output of the integrated starter/generator in a constant power region of the integrated starter/generator, and not shifting the transmission near in response to the absolute value of expected regeneration power of the integrated starter/generator produced at the wheel being less than the constant power output of the integrated starter/generator in the constant power region of the integrated starter/generator. ### Claim 7 A driveline operating method, comprising: charging an electric energy storage device solely via a vehicle's kinetic energy in response to an absolute value of a regenerative braking power not being less than an absolute value of a desired battery charging power; and charging the electric energy storage device via the vehicle's kinetic energy and an engine output torque in response to the absolute value of the regenerative braking power being less than the absolute value of a desired battery charging power. ### Claim 8 (depends on 7) The method of claim 7, further comprising determining an additional charging power provided to the electric energy storage device via the engine output torque and not charging the electric energy storage device via the engine output torque in response to an absolute value of a regenerative braking torque not being less than an absolute value of a rear drive unit electric machine torque threshold. ### Claim 9 (depends on 8) The method of claim 8, where the additional charging power is the desired battery charging power minus the regenerative braking power. ### Claim 10 (depends on 9) The method of claim 9, further comprising determining a desired engine speed in response to the additional charging power and an engine efficiency map. ### Claim 11 (depends on 7) The method of claim 7, where the regenerative braking power is determined via a regenerative braking torque and a wheel speed of a vehicle. ### Claim 12 (depends on 11) The method of claim 11, where the regenerative braking torque is a greater value of one of a requested brake torque, a rear drive unit electric machine torque threshold, a regenerative battery charging torque threshold, and a vehicle torque stability threshold. ### Claim 13 (depends on 7) The method of claim 7, where the desired battery charging power is a function of vehicle speed, driver demand torque, and battery state of charge. ### Claim 14 A driveline operating method, comprising: charging an electric energy storage device solely via a vehicle's kinetic energy in response to an absolute value of regenerative braking power not being less than an absolute value of a desired battery charging power; charging an electric energy storage device via a vehicle's kinetic energy and engine output torque in response to the absolute value of the regenerative braking power being less than the absolute value of the desired battery charging power; and adjusting engine torque in response to an urgency to charge the electric energy storage device when charging the electric energy storage device via the vehicle's kinetic energy and engine output torque. ### Claim 15 (depends on 14) The method of claim 14, where the urgency is based on battery state of charge. ### Claim 16 (depends on 15) The method of claim 15, further comprising adjusting the engine torque in response to actual engine speed when the urgency is high. ### Claim 17 (depends on 15) The method of claim 15, further comprising adjusting the engine torque in response to a desired engine speed when the urgency is not high. ### Claim 18 (depends on 15) The method of claim 15, further comprising determining an additional charging power provided to the electric energy storage device via subtracting the regenerative braking power from the desired battery charging power. ### Claim 19 (depends on 18) The method of claim 18, further comprising adjusting speed of an integrated starter/generator to a speed greater than a base speed of the integrated starter/generator when the additional charging power is greater than or equal to a power output of the integrated starter/generator when the integrated starter/generator is operated in a constant power output region.