Blended torque estimation for automatic transmission systems

• US 20050246084A1
• Filed: 04/30/2004
• Published: 11/03/2005
• Est. Priority Date: 04/30/2004
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (General Motors Company)
• Inventors: Wright, David W., Wilson, Amanda P., Buckley, Jamie M.
• Granted Patent: US 7,236,869 B2
• Time in Patent Office: Days
• US Class Current: 701/51
• CPC Class Codes: F02D 2200/1004 Estimation of the output torque
• CPC Class Codes: F16H 59/14 Inputs being a function of torque or torque demand
• CPC Class Codes: F16H 59/24 dependent on the throttle opening
• CPC Class Codes: F16H 59/30 Intake manifold vacuum

Abstract

A torque prediction module for an automatic transmission system includes a throttle-based torque prediction module. The throttle-based torque prediction module determines a first predicted torque of an engine in a vehicle that is based on a position of a throttle, an ambient air pressure, an intake temperature, and an engine speed. A torque offset module determines a torque offset that is based on the first predicted torque and a second predicted torque of the engine that is based on a mass airflow in an intake manifold of the engine. A blended torque module determines a third predicted torque of the engine that is based on the torque offset and the second predicted torque. A line pressure control module adjusts a line pressure of the automatic transmission based on the third predicted torque. An ECCC control module adjusts an amount of slip in an ECCC based on the third predicted torque.

Claims

1. A torque prediction module for an automatic transmission system, comprising:

a throttle-based torque prediction module that determines a first predicted torque of an engine in a vehicle that is based on a position of a throttle of said vehicle;

a torque offset module that determines a torque offset that is based on said first predicted torque and a second predicted torque of said engine that is based on a mass airflow in an intake manifold of said engine; and

a blended torque module that determines a third predicted torque of said engine that is based on said torque offset and said second predicted torque.

2. The torque prediction module of claim 1 wherein said throttle-based torque prediction module determines said first predicted torque based on an ambient air pressure, an induction temperature in said intake manifold, said position, and a speed of said engine.

3. The torque prediction module of claim 1 further comprising:

a blended torque enable module that determines a change in said position.

4. The torque prediction module of claim 3 wherein said third predicted torque is equal to the sum of said second predicted torque and said torque offset.

5. The torque prediction module of claim 1 wherein a line pressure control module adjusts a line pressure of said automatic transmission based on said third predicted torque.

6. The torque prediction module of claim 3 further comprising:

an electronically controlled capacity clutch (ECCC) control module that determines an ECCC control signal that is based on said third predicted torque.

7. The torque prediction module of claim 6 wherein said ECCC control module adjusts an amount of slip in an ECCC of said automatic transmission system with said ECCC control signal.

8. A method for predicting a torque of an engine for an automatic transmission system in a vehicle, comprising:

determining a first predicted torque of said engine that is based on a position of a throttle of said vehicle;

determining a torque offset that is based on said first predicted torque and a second predicted torque of said engine that is based on a mass airflow in an intake manifold of said engine; and

determining a third predicted torque of said engine that is based on said torque offset and said second predicted torque.

9. The method of claim 8 wherein said first predicted torque is based on an ambient air pressure, an induction temperature in said intake manifold, said position, and a speed of said engine.

10. The method of claim 8 further comprising determining a change in said position.

11. The method of claim 10 wherein said third predicted torque is equal to the sum of said second predicted torque and said torque offset.

12. The method of claim 8 further comprising adjusting a line pressure of said automatic transmission based on said third predicted torque.

13. The method of claim 10 further comprising determining an electronically controlled capacity clutch (ECCC) control signal that is based and said third predicted torque.

14. The method of claim 8 further comprising adjusting an amount of slip in said ECCC of said automatic transmission system with said ECCC control signal.