Hybrid electric vehicle driveline active damping and transient smoothness control

Patent metadata

Field	Value
Publication number	US-9278681-B2
Application number	US-201313837680-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	Mar 15, 2013
Publication date	Mar 8, 2016
Grant date	Mar 8, 2016

Abstract

A method and system for controlling a hybrid electric vehicle include controlling torque in a traction motor in response to a provisional motor torque that has been adjusted based on a difference between a measured traction motor speed and a calculated vehicle speed and filtered to attenuate a resonant driveline frequency.

First claim

What is claimed is:

1. A method of controlling a hybrid electric vehicle comprising:
commanding a traction motor to supply a traction motor torque in response to a provisional motor torque, the provisional motor torque being adjusted by a PD control based on a difference between a measured traction motor speed and a calculated vehicle speed and filtered by a filter to attenuate a driveline natural resonant frequency, the PD control being distinct from the filter.

2. The method of claim 1 , wherein the calculated vehicle speed is based on an average of wheel speed signals.

3. The method of claim 2 , wherein the wheel speed signals are received from an antilock brake system control module.

4. The method of claim 1 , wherein the calculated vehicle speed is based on a measured motor speed filtered through a low pass filter.

5. The method of claim 1 , wherein the provisional motor torque is generated in response to an engine start event.

6. The method of claim 1 , wherein the provisional motor torque is generated in response to a change in driver torque request.

7. A hybrid vehicle controller configured to receive a torque request and output a commanded motor torque, the controller comprising control logic that controls motor torque based on a target torque, the target torque being filtered by a filter to attenuate a driveline natural resonant frequency and adjusted by a PD control based on a difference of a measured motor speed and a calculated vehicle speed, the filter being distinct from the PD control.

8. The controller of claim 7 , wherein the control logic comprises a band stop filter that filters the target torque.

9. The controller of claim 7 , wherein the control logic comprises a band pass filter that filters the target torque.

10. The controller of claim 7 , wherein the calculated vehicle speed is based on an average of wheel speed signals.

11. The controller of claim 10 , wherein the wheel speed signals are received from an antilock brake system control module.

12. The controller of claim 7 , wherein the calculated vehicle speed is based on a measured motor speed filtered through a low pass filter.

13. The controller of claim 7 , wherein the control logic comprises a closed loop controller that adjusts the commanded torque based on a difference between a measured motor speed and a calculated vehicle speed in a feedback path.

14. The controller of claim 13 , wherein the closed loop controller includes a feedforward loop that filters the commanded motor torque to remove frequency components related to the driveline natural resonant frequency in the feedforward path.

15. The controller of claim 13 , wherein the closed loop controller filters the commanded motor torque to remove frequency components related to the driveline natural resonant frequency in the feedback path.

16. A hybrid vehicle comprising:
a motor drivably connected to traction wheels by a driveline having a natural resonant frequency; and
a motor controller configured to control motor torque in response to a provisional motor torque, the provisional motor torque being filtered by a filter to attenuate a driveline resonant frequency and damped by a PD control, distinct from the filter, based on a difference of a measured motor speed and a calculated vehicle speed.

17. The hybrid vehicle of claim 16 , wherein the motor controller filters the provisional motor torque using a band stop filter to remove poles of the driveline natural resonant frequency and introduce a pair of well-damped poles at another frequency.

18. The hybrid vehicle of claim 16 , wherein the calculated vehicle speed is based on an average of wheel speed signals.

19. The hybrid vehicle of claim 18 , wherein the wheel speed signals are received from an antilock brake system control module.

20. The hybrid vehicle of claim 16 , wherein the calculated vehicle speed is based on a measured motor speed filtered through a low pass filter.

Assignees

• Ford Global Tech Llc

Inventors

• Liang Wei
• Doering Jeffrey Allen
• Wang Xiaoyong
• Chrostowski Thomas
• Butcher Jonathan Andrew
• Kuang Ming Lang
• Syed Fazal Urrahman

Classifications

• Y02T10/62

  Hybrid vehicles · CPC title

• Y02T10/7275

  Cross-Sectional Technologies · mapped topic

• B60W30/20 Primary

  Reducing vibrations in the driveline · CPC title

• B60W2710/083

  Torque · CPC title

• B60K6/445

  Differential gearing distribution type · CPC title