# US 9,517,694 B2 · Power hop cancellation using an electronic limited slip differential > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,517,694 B2 - Document ID: US9517694B2 - Status: Granted - Kind: B2 - Application number: 14/323,885 - Filed: 2014-07-03 - Published: 2016-01-07 - Granted: 2016-12-13 - Earliest claimed: 2014-07-03 - Assignees: GM Global Technology Operations LLC - Applicants: GM Global Technology Operations LLC - Inventors: Jason J. Nolte; Dejvis Seitllari - Web page: https://patentgrep.com/patent/US9517694B2 ## CPC - B60K 23/04: for differential gearing - F16H 48/30: using externally-actuatable means - B60K 2023/043: {Control means for varying left-right torque distribution, e.g. torque vectoring} - B60K 2023/046: {Axle differential locking means} - B60W 10/12: including control of differentials - B60W 10/16: Axle differentials, e.g. for dividing torque between left and right wheels - B60W 2510/0638: Engine speed - B60W 2510/1005: Transmission ratio engaged - B60W 2520/10: Longitudinal speed - B60W 2520/105: Longitudinal acceleration - B60W 2520/28: Wheel speed - B60W 2540/10: Accelerator pedal position - B60W 2540/18: Steering angle - B60W 2710/12: Differentials - F16H 48/20: Arrangements for suppressing or influencing the differential action, e.g. locking devices - F16H 2048/204: {Control of arrangements for suppressing differential actions} - F16H 2048/207: {using torque sensors} - 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 - F16H: 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 ## Abstract Vehicles, systems and a method for mitigating power hop in a vehicle are provided. The vehicle, for example, may include, but is not limited to a drivetrain, an electronic limited slip differential mechanically coupled to the drivetrain, and a controller communicatively coupled to the electronic limited slip differential, wherein the controller is configured to determine when the vehicle is experiencing a power hop event or when the vehicle may experience a future power hop event, and cause, when the vehicle is experiencing the power hop event or when the vehicle may experience the future power hop event, the electronic limited slip differential to apply torque differentiation pulses to the drivetrain. ## Claims ### Claim 1 A vehicle, comprising: a drivetrain; an electronic limited slip differential mechanically coupled to the drivetrain; and a controller communicatively coupled to the electronic limited slip differential, wherein the controller is configured to: determine when the vehicle is experiencing a power hop event or when the vehicle may experience a future power hop event when a speed of the vehicle is below a first predetermined threshold and a revolutions-per-minute of an engine of the vehicle is above a second predetermined threshold, the power hop event and the further power hop event including a twisting of at least a portion of a driveline of the vehicle; and cause, when the vehicle is experiencing the power hop event or when the vehicle may experience the future power hop event, the electronic limited slip differential to create torque differentiation pulses on the drivetrain. ### Claim 2 (depends on 1) The vehicle of claim 1, further comprising: at least one sensor communicatively coupled to the controller, wherein the controller is further configured to determine when the vehicle is experiencing the power hop event or when the vehicle may experience the future power hop event based upon data from the at least one sensor. ### Claim 3 (depends on 2) The vehicle of claim 2, wherein the data includes a speed of the vehicle and a revolutions per minute of an engine of the vehicle. ### Claim 4 (depends on 2) The vehicle of claim 2, wherein the controller is configured to modify the torque differentiation pulses applied by the electronic limited slip differential based upon the data from the at least one sensor. ### Claim 5 (depends on 4) The vehicle of claim 4, wherein the controller modifies at least one of an amplitude, frequency and phase of the torque differentiation pulses. ### Claim 6 (depends on 1) The vehicle of claim 1, further comprising: a memory communicatively coupled to the controller, wherein the memory is configured to store a waveform, wherein the controller is further configured to cause the electronic limited slip differential to create torque differentiation pulses on the drivetrain based upon the waveform. ### Claim 7 (depends on 6) The vehicle of claim 6, further comprising: at least one sensor communicatively coupled to the controller, wherein the controller is further configured to modify the waveform based upon data from the at least one sensor. ### Claim 8 A method for mitigating power hop in a vehicle, comprising: determining, by a controller, when the vehicle is experiencing a power hop event or when the vehicle may experience a future power hop event when a speed of the vehicle is below a first predetermined threshold and a revolutions-pre-minute of an engine of the vehicle is above a second predetermined threshold, the power hop event and the future power hop event including a twisting of at least a portion of a driveline of the vehicle; and causing, by the controller, an electronic limited slip differential to cause torque differentiation pulses on a drivetrain of the vehicle when the vehicle is experiencing the power hop event or when the vehicle may experience the future power hop event. ### Claim 9 (depends on 8) The method of claim 8, wherein the determining further comprises: receiving, by the controller, data from at least one sensor; and determining, by the controller, when the vehicle is experiencing a power hop event or when the vehicle may experience a future power hop event based upon the data from the at least one sensor. ### Claim 10 (depends on 9) The method of claim 9, wherein the data includes at least a speed of the vehicle and a revolutions per minute of an engine of the vehicle. ### Claim 11 (depends on 8) The method of claim 8, wherein the causing further comprises: receiving, by the controller, data from at least one sensor; determining, by the controller, a state of the vehicle based upon the data from the at least one sensor; and determining, by the processor, a waveform corresponding to the torque differentiation pulses to apply to the drivetrain of the vehicle. ### Claim 12 (depends on 11) The method of claim 11, further comprising: modifying by the processor, the waveform based upon an amplitude, frequency and phase of the power hop event. ### Claim 13 (depends on 8) The method of claim 8, further comprising: causing, by the electronic limited slip differential, torque differentiation pulses on the drivetrain of the vehicle for a predetermined period of time. ### Claim 14 (depends on 8) The method of claim 8, further comprising: causing, by the electronic limited slip differential, torque differentiation pulses on the drivetrain of the vehicle while an amplitude of the power hop event is greater than a predetermined threshold. ### Claim 15 A system, comprising: a drivetrain; an electronic limited slip differential mechanically coupled to the drivetrain; and a controller communicatively coupled to the electronic limited slip differential, the controller configured to: determine when the system is experiencing a power hop event or when the system may experience a future power hop event when a speed of the system is below a first predetermined threshold and a revolutions-per-minute of an engine of the system is above a second predetermined threshold, the power hop event and the further power hope event including a twisting of at least a portion of a driveline of the system; and cause, when the system is experiencing the power hop event or when the system may experience the future power hop event, the electronic limited slip differential to create torque differentiation pulses on the drivetrain. ### Claim 16 (depends on 15) The system of claim 15, further comprising: at least one sensor communicatively coupled to the controller, wherein the controller is further configured to determine when the system is experiencing the power hop event or when the system may experience the future power hop event based upon data from the at least one sensor. ### Claim 17 (depends on 16) The system of claim 16, wherein the controller is configured to modify the torque differentiation pulses created by the electronic limited slip differential based upon the data from the at least one sensor. ### Claim 18 (depends on 17) The system of claim 17, wherein the controller modifies at least one of an amplitude, frequency and phase of the torque differentiation pulses. ### Claim 19 (depends on 15) The system of claim 15, further comprising: a memory communicatively coupled to the controller, wherein the memory is configured to store waveform, wherein the controller is further configured to cause the electronic limited slip differential to create torque differentiation pulses on the drivetrain based upon the waveform. ### Claim 20 (depends on 19) The system of claim 19, further comprising: at least one sensor communicatively coupled to the controller, wherein the controller is further configured to modify one of the at least one waveform based upon data from the at least one sensor.