# US 10,766,351 B2 · System and method of controlling reverse driving of hybrid vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,766,351 B2 - Document ID: US10766351B2 - Status: Granted - Kind: B2 - Application number: 16/159,873 - Filed: 2018-10-15 - Published: 2019-06-20 - Granted: 2020-09-08 - Earliest claimed: 2017-12-18 - Assignees: Hyundai Motor Company; Kia Motors Corporation - Applicants: Hyundai Motor Company; Kia Motors Corporation - Inventors: Seok Young Yun; Song Il Park; Tae Young Chung - Web page: https://patentgrep.com/patent/US10766351B2 ## CPC - B60K 6/547: the transmission being a stepped gearing - B60K 6/36: characterised by the transmission gearings - B60K 6/387: Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means - B60K 6/442: Series-parallel switching type - B60K 6/48: Parallel type - B60W 10/06: including control of combustion engines - B60W 10/08: including control of electric propulsion units, e.g. motors or generators - B60W 10/26: for electrical energy, e.g. batteries or capacitors - B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)} - B60W 20/20: Control strategies involving selection of hybrid configuration, e.g. selection between series or parallel configuration - B60W 20/30: Control strategies involving selection of transmission gear ratio {(control of change speed gearings, together with other vehicle sub-units B60W10/10; HEV transmission gearing B60K6/36; gearings and control thereof F16H)} - B60W 20/50: Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode - B60W 30/18036: {Reversing} - B60K 2006/4825: {Electric machine connected or connectable to gearbox input shaft} - B60K 2006/541: {without reverse ratio using instead electric reversing} - B60W 2510/02: Clutches - B60W 2510/244: Charge state - B60W 2540/16: Ratio selector position - Y02T 10/62: Hybrid vehicles - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - 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 - 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 - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method of controlling reverse driving of a hybrid vehicle is provided, in which a reverse gear train of a gear box of a transmission for reverse driving is omitted. When a gear stage enters a reverse stage or is changed from a drive stage to a reverse stage, an engine performs an electric energy charging function on a battery via a hybrid starter generator and a motor transmits driving power for reverse driving to travelling wheels. Accordingly, the battery is charged with electric energy and simultaneously, the motor is reversely driven based on the electric energy supplied from the battery, thereby enabling a hybrid vehicle to be more easily reversed. ## Claims ### Claim 1 A method of controlling reverse driving of a hybrid vehicle, comprising: determining, by a transmission controller, when a gear stage enters a reverse gear stage by an operation of a driver; detecting, by the transmission controller, whether an engine clutch has a failure or the engine clutch is in a normal operation state; in response to detecting that the engine clutch is in the normal operation state, releasing, by an engine clutch controller, the engine clutch; detecting a state of charge (SOC) of a high-voltage battery via a battery management system; and in response to detecting that the SOC of the high-voltage battery is in a normal level in which the SOC is equal to or greater than a threshold value, operating, by a motor controller, a motor to be driven in a reverse direction. ### Claim 2 (depends on 1) The method of claim 1, wherein the operation of the motor is continued to maintain an engine in an off state and the engine clutch in a release (open) state. ### Claim 3 (depends on 1) The method of claim 1, wherein when the SOC of the high-voltage battery is less than the threshold value, a battery charging control according to the driving of the engine is performed in the state where an open state of the engine clutch is maintained and simultaneously, the motor is operated to be driven in the reverse direction. ### Claim 4 (depends on 3) The method of claim 3, wherein the battery charging control includes: turning on, by an engine controller, an engine; operating a hybrid starter generator connected to a crank shaft of the engine to generate power; and charging a high-voltage battery according to the power generation of the hybrid starter generator. ### Claim 5 (depends on 1) The method of claim 1, wherein in response to detecting that the engine clutch has the failure in an open state, the SOC of the high-voltage battery is detected. ### Claim 6 (depends on 5) The method of claim 5, wherein in response to determining that the SOC state of the high-voltage battery is in the normal level in which the SOC is equal to or greater than the threshold value, a motor is operated to be driven in the reverse direction. ### Claim 7 (depends on 5) The method of claim 5, wherein in response to determining that the SOC of the high-voltage battery is less than the threshold value, a battery charging control according to the driving of an engine is performed in the state where an open state of the engine clutch is maintained and simultaneously, the motor is operated to be driven in the reverse direction. ### Claim 8 (depends on 7) The method of claim 7, wherein the battery charging control includes: turning on, by an engine controller, an engine; operating a hybrid starter generator connected to a crank shaft of the engine to generate power; and charging a high-voltage battery according to the power generation of the hybrid starter generator. ### Claim 9 (depends on 1) The method of claim 1, wherein in response to detecting that the engine clutch has the failure in a close state or that the engine clutch has the failure in a sleep state, the engine is operated to maintain an off state and simultaneously, the motor is operated to be driven in the reverse direction. ### Claim 10 A system of controlling reverse driving of a hybrid vehicle, comprising: a controller having a memory configured to store program instructions and a processor configured to execute the program instructions, the program instructions when executed configured to: determine when a gear stage enters a reverse gear stage by an operation of a driver; detect whether an engine clutch has a failure or the engine clutch is in a normal operation state; in response to detecting that the engine clutch is in the normal operation state, release the engine clutch; detect a state of charge (SOC) of a high-voltage battery via a battery management system; and in response to detecting that the SOC of the high-voltage battery is in a normal level in which the SOC is equal to or greater than a threshold value, operate a motor to be driven in a reverse direction. ### Claim 11 (depends on 10) The system of claim 10, wherein the operation of the motor is continued to maintain an engine in an off state and the engine clutch in a release (open) state. ### Claim 12 (depends on 10) The system of claim 10, wherein when the SOC of the high-voltage battery is less than the threshold value, a battery charging control according to the driving of the engine is performed in the state where an open state of the engine clutch is maintained and simultaneously, the motor is operated to be driven in the reverse direction. ### Claim 13 (depends on 10) The system of claim 10, wherein in response to detecting that the engine clutch has the failure in an open state, the SOC of the high-voltage battery is detected. ### Claim 14 (depends on 13) The system of claim 13, wherein in response to determining that the SOC state of the high-voltage battery is in the normal level in which the SOC is equal to or greater than the threshold value, a motor is operated to be driven in the reverse direction. ### Claim 15 (depends on 13) The system of claim 13, wherein in response to determining that the SOC of the high-voltage battery is less than the threshold value, a battery charging control according to the driving of an engine is performed in the state where an open state of the engine clutch is maintained and simultaneously, the motor is operated to be driven in the reverse direction. ### Claim 16 (depends on 10) The system of claim 10, wherein in response to detecting that the engine clutch has the failure in a close state or that the engine clutch has the failure in a sleep state, the engine is operated to maintain an off state and simultaneously, the motor is operated to be driven in the reverse direction.