Monitoring transmission speed control request for improved shift quality

Patent metadata

Field	Value
Publication number	US-11046325-B2
Application number	US-202016817763-A
Country	US
Kind code	B2
Filing date	Mar 13, 2020
Priority date	Mar 22, 2019
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

A vehicle control system and method utilize a transmission control module configured to generate a first target speed for a torque generating system for executing a downshift of an automatic transmission and a torque generating system control module configured to determine a second target speed for the torque generating system for executing the downshift of the automatic transmission, determine upper and lower target speed limits for the torque generating system for executing the downshift of the automatic transmission, based on the first and second target speeds and the upper and lower target speed limits, determine a final target speed for the torque generating system for executing the downshift of the automatic transmission, determine a target torque output for the torque generating system based on a current speed of and the final target speed for the torque generating system, and control the torque generating system based on the target torque output.

First claim

What is claimed is:

1. A control system for a vehicle comprising a torque generating system and an automatic transmission, the control system comprising:
a transmission control module configured to control the automatic transmission and to generate a first target speed for the torque generating system for executing a downshift of the automatic transmission; and
a torque generating system control module configured to control the torque generating system and to:
receive the first target speed for the torque generating system;
determine a second target speed for the torque generating system for executing the downshift of the automatic transmission;
determine upper and lower target speed limits for the torque generating system for executing the downshift of the automatic transmission;
based on the first and second target speeds and the upper and lower target speed limits, determine a final target speed for the torque generating system for executing the downshift of the automatic transmission;
determine a target torque output for the torque generating system based on a current speed of and the final target speed for the torque generating system; and
control the torque generating system based on the target torque output.

2. The control system of claim 1 , wherein the torque generating system control module is configured to set the first target speed for the torque generating system equal to the second target speed when the first target speed for the torque generating system is greater than the second target speed for the torque generating system.

3. The control system of claim 2 , wherein the torque generating system control module is configured to set the first target speed for the torque generating system equal to the lower target speed limit of the torque generating system when the first target speed for the torque generating system is less than the lower target speed limit of the torque generating system.

4. The control system of claim 3 , wherein the lower target speed limit for the torque generating system is the current speed of the torque generating system.

5. The control system of claim 3 , wherein the torque generating system control module is configured to set the first target speed for the torque generating system equal to the upper target speed limit of the torque generating system when the first target speed for the torque generating system is greater than the upper target speed limit of the torque generating system.

6. The control system of claim 5 , wherein the upper target speed limit for the torque generating system is a maximum or redline speed for the torque generating system.

7. The control system of claim 5 , wherein the torque generating system control module is configured to determine the final target speed for the torque generating system as the first target speed for the torque generating system.

8. The control system of claim 7 , wherein the torque generating system control module is configured to determine the target torque output for the torque generating system as a function of (i) a difference between the final target speed for and current speed of the torque generating system and (ii) the final target speed for the torque generating system.

9. The control system of claim 8 , wherein the torque generating system control module is further configured to generate a torque multiplier as a function of (i) a current gear of the automatic transmission and (ii) a target gear of the automatic transmission.

10. The control system of claim 9 , wherein the torque generating system control module is further configured to multiply the target torque output for the torque generating system by the torque multiplier to obtain and subsequently utilize a modified target torque output for the torque generating system.

11. A method for controlling a vehicle comprising a torque generating system and an automatic transmission, the method comprising:
generating, by a transmission control module configured to control the automatic transmission, a first target speed for the torque generating system for executing a downshift of the automatic transmission;
receiving, by a torque generating system control module configured to control the torque generating system, the first target speed for the torque generating system from the transmission control module;
determining, by the torque generating system control module, a second target speed for the torque generating system for executing the downshift of the automatic transmission;
determining, by the torque generating system control module, upper and lower target speed limits for the torque generating system for executing the downshift of the automatic transmission;
based on the first and second target speeds and the upper and lower target speed limits, determining, by the torque generating system control module, a final target speed for the torque generating system for executing the downshift of the automatic transmission;
determining, by the torque generating system control module, a target torque output for the torque generating system based on a current speed of and the final target speed for the torque generating system; and
controlling, by the torque generating system control module, the torque generating system based on the target torque output.

12. The method of claim 11 , further comprising setting, by the torque generating system control module, the first target speed for the torque generating system equal to the second target speed when the first target speed for the torque generating system is greater than the second target speed for the torque generating system.

13. The method of claim 12 , further comprising setting, by the torque generating system control module, the first target speed for the torque generating system equal to the lower target speed limit of the torque generating system when the first target speed for the torque generating system is less than the lower target speed limit of the torque generating system.

14. The method of claim 13 , wherein the lower target speed limit for the torque generating system is the current speed of the torque generating system.

15. The method of claim 13 , further comprising setting, by the torque generating system control module, the first target speed for the torque generating system equal to the upper target speed limit of the torque generating system when the first target speed for the torque generating system is greater than the upper target speed limit of the torque generating system.

16. The method of claim 15 , wherein the upper target speed limit for the torque generating system is a maximum or redline speed for the torque generating system.

17. The method of claim 15 , further comprising determining, by the torque generating system control module, the final target speed for the torque generating system as the first target speed for the torque generating system.

18. The method of claim 17 , further comprising determining, by the torque generating system control module, the target torque output for the torque generating system as a function of (i) a difference between the final target speed for and current speed of the torque generating system and (ii) the final target speed for the torque generating system.

19. The method of claim 18 , further comprising generating, by the torque generating system control module, a torque multiplier as a function of (i) a current gear of the automatic transmission and (ii) a target gear of the automatic transmission.

20. The method of claim 19 , further comprising multipl

Assignees

• Boopalam Chandrashekar
• Gavara Chandrakant
• Fca Us Llc

Inventors

• Boopalam Chandrashekar
• Gavara Chandrakant

Classifications

• F16H63/502 Primary

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• F16H61/437

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• B60W10/11

  Stepped gearings · CPC title

• F16H2059/366

  Engine or motor speed · CPC title

• F16H61/686

  with orbital gears · CPC title