System and method for controlling an engine based on a desired turbine power to account for losses in a torque converter

Patent metadata

Field	Value
Publication number	US-9701299-B2
Application number	US-201414248571-A
Country	US
Kind code	B2
Filing date	Apr 9, 2014
Priority date	Feb 27, 2014
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A system includes a desired turbine power module and an engine actuator module. The desired turbine power module determines a desired amount of power at a turbine of a torque converter based on an accelerator pedal position and a vehicle speed. The torque converter transfers torque from an engine to a driveline and includes an impeller and the turbine. The impeller is connected to a crankshaft of the engine. The turbine is connected to a transmission in the driveline and is at least one of hydraulically coupled and mechanically coupled to the impeller. The engine actuator module controls an actuator of the engine based on the desired turbine power.

First claim

What is claimed is:

1. A system comprising:
a desired turbine power module that determines a desired amount of power at a turbine of a torque converter based directly on an accelerator pedal position and a vehicle speed, wherein:
the torque converter transfers torque from an engine to a driveline and includes an impeller and the turbine;
the impeller is connected to a crankshaft of the engine; and
the turbine is connected to a transmission in the driveline and is at least one of hydraulically coupled and mechanically coupled to the impeller; and

an engine actuator module that controls an actuator of the engine based on the desired turbine power.

2. The system of claim 1 further comprising a desired engine torque module that determines a desired engine torque based on the desired turbine power and a desired speed of the engine, wherein the engine actuator module controls the engine actuator based on the desired engine torque.

3. The system of claim 2 further comprising a desired engine speed module that determines the desired engine speed based on at least one of an actual turbine speed, an actual engine speed, and a first ratio of the actual turbine speed to the actual engine speed.

4. The system of claim 3 wherein the desired engine speed module determines the desired engine speed based on the actual turbine speed and the desired turbine power.

5. A system comprising:
a desired turbine power module that determines a desired amount of power at a turbine of a torque converter based on an accelerator pedal position and a vehicle speed, wherein:
the torque converter transfers torque from an engine to a driveline and includes an impeller and the turbine;
the impeller is connected to a crankshaft of the engine; and
the turbine is connected to a transmission in the driveline and is at least one of hydraulically coupled and mechanically coupled to the impeller;
an engine actuator module that controls an actuator of the engine based on the desired turbine power;
a desired engine torque module that determines a desired engine torque based on the desired turbine power and a desired speed of the engine, wherein the engine actuator module controls the engine actuator based on the desired engine torque; and
a desired engine speed module that determines the desired engine speed based on at least one of an actual turbine speed, an actual engine speed, and a first ratio of the actual turbine speed to the actual engine speed,
wherein the desired engine speed module determines the desired engine speed based on the actual turbine speed and the desired turbine power, and
wherein, when the first ratio is greater than a predetermined value, the desired engine speed module adjusts the desired engine speed to a first speed that is equal to the actual turbine speed.

6. The system of claim 5 wherein, when the first ratio is less than or equal to the predetermined value, the desired engine speed module adjusts the desired engine speed to a second speed that is equal to a product of the actual turbine speed and a second ratio of an actual turbine torque to an actual engine torque.

7. The system of claim 6 further comprising a torque ratio module that determines the second ratio based on the first ratio.

8. The system of claim 6 wherein the desired engine speed module adjusts the desired engine speed between the first speed and the second speed based on a current value of the actual engine speed and a future value of the actual engine speed.

9. The system of claim 8 wherein, when a clutch in the torque converter is applied, the desired engine speed module predicts the future value of the actual engine speed based on the actual turbine speed.

10. The system of claim 8 wherein, when a clutch in the torque converter is released, the desired engine speed module predicts the future value of the actual engine speed based on the actual turbine speed and the desired turbine power.

11. A method comprising:
determining a desired amount of power at a turbine of a torque converter based directly on an accelerator pedal position and a vehicle speed, wherein:
the torque converter transfers torque from an engine to a driveline and includes an impeller and the turbine;
the impeller is connected to a crankshaft of the engine; and
the turbine is connected to a transmission in the driveline and is at least one of hydraulically coupled and mechanically coupled to the impeller; and

controlling an actuator of the engine based on the desired turbine power.

12. The method of claim 11 further comprising:
determining a desired engine torque based on the desired turbine power and a desired speed of the engine; and
controlling the engine actuator based on the desired engine torque.

13. The method of claim 12 further comprising determining the desired engine speed based on at least one of an actual turbine speed, an actual engine speed, and a first ratio of the actual turbine speed to the actual engine speed.

14. The method of claim 13 further comprising determining the desired engine speed based on the actual turbine speed and the desired turbine power.

15. A method comprising:
determining a desired amount of power at a turbine of a torque converter based on an accelerator pedal position and a vehicle speed, wherein:
the torque converter transfers torque from an engine to a driveline and includes an impeller and the turbine;
the impeller is connected to a crankshaft of the engine; and
the turbine is connected to a transmission in the driveline and is at least one of hydraulically coupled and mechanically coupled to the impeller;

controlling an actuator of the engine based on the desired turbine power;
determining a desired engine torque based on the desired turbine power and a desired speed of the engine;
controlling the engine actuator based on the desired engine torque;
determining the desired engine speed based on at least one of an actual turbine speed, an actual engine speed, and a first ratio of the actual turbine speed to the actual engine speed;
determining the desired engine speed based on the actual turbine speed and the desired turbine power; and
when the first ratio is greater than a predetermined value, adjusting the desired engine speed to a first speed that is equal to the actual turbine speed.

16. The method of claim 15 further comprising, when the first ratio is less than or equal to the predetermined value, adjusting the desired engine speed to a second speed that is equal to a product of the actual turbine speed and a second ratio of an actual turbine torque to an actual engine torque.

17. The method of claim 16 further comprising determining the second ratio based on the first ratio.

18. The method of claim 16 further comprising adjusting the desired engine speed between the first speed and the second speed based on a current value of the actual engine speed and a future value of the actual engine speed.

19. The method of claim 18 further comprising predicting the future value of the actual engine speed based on the actual turbine speed when a clutch in the torque converter is applied.

20. The method of claim 18 further comprising predicting the future value of the actual engine speed based on the actual turbine speed and the desired turbine power when a clutch in the torque converter is released.

21. The system of claim 1 wherein the desired turbine power module determines the desired turbine power independent of a gear ratio of the driveline.

22. The met

Assignees

• Gm Global Tech Operations Llc

Inventors

• Horgan Jeremy V
• Shupe Todd R
• Cabrera Christine

Classifications

• F02D41/10

  for acceleration · CPC title

• F02D41/0215

  in relation with elements of the transmission · CPC title

• F02D13/0207

  changing valve lift or valve lift and timing · CPC title

• F02D2041/1412

  using a predictive controller · CPC title

• F02D17/02

  Cutting-out (cutting-out engines in multiple engine arrangements F02D25/04) · CPC title