Hybrid vehicle and lash mitigation strategy

Patent metadata

Field	Value
Publication number	US-9944285-B2
Application number	US-201615061271-A
Country	US
Kind code	B2
Filing date	Mar 4, 2016
Priority date	Mar 4, 2016
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A drivetrain system includes a controller that is programmed to, in a presence of a request for increased drivetrain torque that results in reversal of drivetrain torque direction, command an increase in drivetrain torque at a reduced rate while a value that is based on drivetrain speed difference remains within a predetermined range absent a braking torque request exceeding a threshold. The controller is further programmed to command the increase at an accelerated rate upon the braking torque request exceeding the threshold.

First claim

What is claimed is:

1. A drivetrain system comprising:
a controller programmed to, in a presence of a request for increased drivetrain torque that results in reversal of drivetrain torque direction, command an increase in drivetrain torque at a reduced rate while a value that is based on drivetrain speed difference remains within a predetermined range absent a braking torque request exceeding a threshold, and command the increase at an accelerated rate upon the braking torque request exceeding the threshold.

2. The system of claim 1 , wherein the controller is further programmed to command the increase at the accelerated rate upon the request for increased drivetrain torque exceeding a torque request threshold.

3. The system of claim 1 , wherein the controller is further programmed to command the increase at the accelerated rate upon the expiration of a predefined time limit while the value remains within the predetermined range.

4. The system of claim 1 , wherein the drivetrain speed difference is a difference in speed between an electric machine and a drive wheel.

5. The system of claim 4 , wherein the value is based on an integral of the difference in speed between the electric machine and the drive wheel.

6. A controller comprising:
input channels configured to receive parameters indicative of drivetrain speed difference and requests for drivetrain torque;
output channels configured to provide commands to increase drivetrain torque; and
control logic programmed to, in a presence of a request for increased drivetrain torque that results in reversal of drivetrain torque direction, generate a command to increase drivetrain torque at a reduced rate so long as a value that is based on drivetrain speed difference remains within a predetermined range absent the request for increased drivetrain torque exceeding a threshold, and generate a command to increase drivetrain torque at an accelerated rate upon the request for increased drivetrain torque exceeding the threshold.

7. The controller of claim 6 , wherein the control logic is further programmed to, in response to a braking torque request exceeding a braking torque threshold, generate the command to increase drivetrain torque at the accelerated rate.

8. The controller of claim 6 , wherein the control logic is further programmed to, upon expiration of a predefined time limit while the value remains within the predetermined range, generate the command to increase drivetrain torque at the accelerated rate.

9. The controller of claim 6 , wherein the drivetrain speed difference is a difference in speed between an electric machine and a drive wheel.

10. The controller of claim 9 , wherein the value is based on an integral of the difference in speed between the electric machine and the drive wheel.

11. A vehicle comprising:
a drivetrain; and
a controller programmed to, in response to a request for increased drivetrain torque resulting in a reversal of drivetrain torque direction,
increase the drivetrain torque at a reduced rate while a value that is based on drivetrain speed difference remains within a predetermined range, and
increase the drivetrain torque at an accelerated rate upon expiration of a predefined time limit while the value remains within the predetermined range.

12. The vehicle of claim 11 , wherein the controller is further programmed to increase the drivetrain torque at the accelerated rate upon the request for increased drivetrain torque exceeding a torque request threshold.

13. The vehicle of claim 11 , wherein the controller is further programmed increase the drivetrain torque at the accelerated rate upon a braking torque request exceeding a braking torque threshold.

14. The vehicle of claim 11 , wherein the drivetrain speed difference is a difference in speed between an electric machine and a drive wheel.

15. The vehicle of claim 14 , wherein the value is based on an integral of the difference in speed between the electric machine and the drive wheel.

Assignees

• Ford Global Tech Llc

Inventors

• Doan Jacob
• Okubo Shunsuke
• Okubo Carol Louise
• Nault Benjamin

Classifications

• B60W2720/30

  Wheel torque · CPC title

• B60W2710/105

  Output torque · CPC title

• B60W10/115

  with planetary gears · CPC title

• B60W30/18036 Primary

  Reversing · CPC title

• B60W20/00

  Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)} · CPC title