VEHICLE POWERTRAIN LASH CROSSING CONTROL STRATEGY

• US 20190329785A1
• Filed: 04/27/2018
• Published: 10/31/2019
• Est. Priority Date: 04/27/2018
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: FARMER, Mary Catherine, REED, Dennis Craig, KUECHLER, Peter Douglas, FELDPAUSCH, Terry Gene, FINK, Mitchell Thomas
• Granted Patent: US 10,457,291 B1
• Time in Patent Office: Days
• CPC Class Codes: B60W 2422/95 Measuring the same parameter at multiple locations of the vehicle
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2720/00 Output or target parameters relating to overall vehicle dynamics
• CPC Class Codes: B60W 30/025 related to comfort of drivers or passengers
• CPC Class Codes: B60W 30/20 Reducing vibrations in the driveline
• CPC Class Codes: B60W 40/06 Road conditions

Abstract

A vehicle includes a powertrain and a controller. The powertrain includes a powerplant. The controller is programmed to, responsive to a tip-in resulting in a powertrain torque direction reversal and upon obtaining a base value of a desired powertrain lash angle, adjust a powerplant torque schedule. The controller is then subsequently programmed to adjust the desired powertrain lash angle from the base to an adjusted value based on an observed powertrain lash angle that corresponds to a maximum powertrain acceleration during the tip-in.

Claims

1. A vehicle comprising:

a powertrain including a powerplant; and

a controller programmed to,

responsive to a tip-in resulting in a powertrain torque direction reversal and upon obtaining a base value of a desired powertrain lash angle, adjust a powerplant torque schedule, and

subsequently adjust the desired powertrain lash angle from the base to an adjusted value based on an observed powertrain lash angle that corresponds to a maximum powertrain acceleration during the tip-in.

2. The vehicle of claim 1, wherein the controller is further programmed to, responsive to a subsequent tip-in resulting in a second powertrain torque direction reversal and upon obtaining the adjusted value of the desired powertrain lash angle, adjust the powerplant torque schedule.

3. The vehicle of claim 2, where the powerplant torque schedule is adjusted from an anti-jerk torque schedule to a driver demanded torque.

4. The vehicle of claim 1, wherein the desired powertrain lash angle is adjusted from the base to the adjusted value based on a difference between the observed powertrain lash angle and the base value.

5. The vehicle of claim 4, wherein the desired powertrain lash angle is adjusted from the base to the adjusted value based on a weighting factor multiplied the difference, wherein the weighting value increases as the difference increases from a first to a second value, and wherein the weighting value decreases as the difference increases from the second to a third value.

6. The vehicle of claim 4, wherein the desired powertrain lash angle is adjusted from the base to the adjusted value based on a weighting factor multiplied the difference, wherein the weighting value increases as a difference between the maximum powertrain acceleration and minimum powertrain acceleration observed during the tip-in increases.

7. The vehicle of claim 1, wherein the controller is further programmed to, responsive to a gear shift within a transmission of the powertrain during the tip-in, override adjusting the desired powertrain lash angle from the base to the adjusted value.

8. The vehicle of claim 1, wherein the controller is further programmed to, responsive to detection of rough road conditions during the tip-in, override adjusting the desired powertrain lash angle from the base to the adjusted value.

9. The vehicle of claim 1, wherein the controller is further programmed to, responsive to a driver demanded torque being less than a threshold during the tip-in, override adjusting the desired powertrain lash angle from the base to the adjusted value.

10. The vehicle of claim 1, wherein the controller is further programmed to, responsive to a torque output of the powerplant being greater than a threshold during the tip-in, override adjusting the desired powertrain lash angle from the base to the adjusted value.

11. A method comprising:

responsive to a tip-in resulting in a torque direction reversal in a vehicle powertrain, increasing powertrain torque according to an anti-jerk schedule;

responsive to obtaining a desired powertrain lash angle, adjusting the powertrain torque from the anti-jerk schedule to a driver demanded torque; and

adjusting the desired powertrain lash angle during a subsequent tip-in based on an observed powertrain lash angle that corresponds to a maximum powertrain acceleration observed during the tip-in.

12. The method of claim 11, wherein the desired powertrain lash angle is adjusted during the subsequent tip-in from a base to an adjusted value based on a difference between the observed powertrain lash angle and the base value.

13. The method of claim 12, wherein the desired powertrain lash angle is adjusted from the base to the adjusted value based on a weighting factor multiplied the difference, wherein the weighting value increases as the difference increases from a first to a second value, and wherein the weighting value decreases as the difference increases from the second to a third value.

14. The method of claim 12, wherein the desired powertrain lash angle is adjusted from the base to the adjusted value based on a weighting factor multiplied the difference, wherein the weighting value increases as a difference between the maximum powertrain acceleration and minimum powertrain acceleration observed during the tip-in increases.

15. A method comprising:

responsive to a desired powertrain lash angle obtaining a base value during a tip-in, signaling an end of a lash crossing;

adjusting the desired powertrain lash angle from the base to an adjusted value based on a maximum powertrain acceleration observed during the tip-in; and

responsive to the desired powertrain lash angle obtaining the adjusted value during a subsequent tip-in, signaling the end of the lash crossing.

16. The method of claim 15 further comprising, responsive to the desired powertrain lash angle obtaining the base value during the tip-in, adjusting powertrain torque from an anti-jerk schedule to a driver demanded torque.

17. The method of claim 16 further comprising, responsive to the desired powertrain lash angle obtaining the adjusted value during the subsequent tip-in, adjusting powertrain torque from the anti-jerk schedule to the driver demanded torque.

18. The method of claim 15, wherein the desired powertrain lash angle is adjusted from the base to the adjusted value based on a difference between the observed powertrain lash angle that corresponds to the maximum powertrain acceleration and the base value.

19. The method of claim 18, wherein the desired powertrain lash angle is adjusted from the base to the adjusted value based on a weighting factor multiplied the difference, wherein the weighting value increases as the difference increases from a first to a second value, and wherein the weighting value decreases as the difference increases from the second to a third value.

20. The method of claim 18, wherein the desired powertrain lash angle is adjusted from the base to the adjusted value based on a weighting factor multiplied the difference, wherein the weighting value increases as a difference between the maximum powertrain acceleration and minimum powertrain acceleration observed during the tip-in increases.