Multiple speed transmission having fuel economy mode

• US 7,684,919 B2
• Filed: 05/23/2006
• Issued: 03/23/2010
• Est. Priority Date: 05/23/2006
• Status: Active Grant

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: AbuSamra, Muneer
• Primary Examiner(s): Zanelli; Michael J.
• Application Number:
  US11/439,032
• Publication Number:
  US 20070276570A1
• Time in Patent Office: 1,400 Days
• Field of Search: None
• US Class Current: 701/54
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 30/1882 characterised by the working point of the engine, e.g. by using engine output chart
• CPC Class Codes: F16H 2061/0015 Transmission control for optimising fuel consumptions
• CPC Class Codes: F16H 2300/14 Selecting a state of operation, e.g. depending on two wheel or four wheel drive mode
• CPC Class Codes: F16H 61/0213 characterised by the method for generating shift signals
• CPC Class Codes: F16H 63/42 Ratio indicator devices
• CPC Class Codes: Y02T 10/40 Engine management systems
• CPC Class Codes: Y02T 10/84 Data processing systems or methods, management, administration

Abstract

An method of operating a multiple speed (gear ratio) mechanical transmission and engine combination to optimize (reduce) fuel consumption comprises the steps of determining a fuel efficiency map for an engine, providing a multiple speed mechanical transmission controller having data and program storage capabilities, providing data regarding the fuel efficiency map to the controller and providing a control algorithm in the controller whereby operation of the engine/transmission combination is optimized for fuel economy in accordance with the fuel efficiency map.

Claims

1. A method of operating a multiple speed transmission having a transmission controller with a memory, comprising:

performing by the transmission controller;

receiving from an internal combustion engine controller a portion of a fuel map for an internal combustion engine having an operating region of optimum efficiency, wherein said internal combustion engine controller is operable to control a flow of fuel to said internal combustion engine;

storing said portion in said memory;

providing an upshift command when a speed of said internal combustion engine is greater than a speed associated with said operating region of optimum efficiency by a first predetermined value; and

providing a downshift command when said speed of said internal combustion engine is less than said speed associated with said operating region of optimum efficiency by a second predetermined value.

2. The method of claim 1, further comprising determining if an enable signal has been received, wherein said providing an upshift command comprises providing an upshift command if said enable signal has been received.

3. The method of claim 2, further comprising receiving said enable signal from a vehicle operator.

4. The method of claim 1, wherein said transmission controller receives speed data from said internal combustion engine.

5. The method of claim 1, wherein said method operates in the highest three gears of said multiple speed transmission.

6. The method of claim 1, wherein said portion of said fuel map comprises engine speed data and engine load data.

7. The method of claim 1, wherein said first predetermined values and said second predetermined value are less than 200 revolutions per minute.

8. The method of claim 1, wherein said multiple speed transmission comprises an automated mechanical transmission, further comprising transmitting said upshift command and said downshift command to a transmission actuator.

9. The method of claim 1, wherein said multiple speed transmission comprises a manual transmission, further comprising transmitting said upshift command and said downshift command to an indicator.

10. A multiple speed transmission system providing improved fuel efficiency comprising:

a multiple speed transmission;

a transmission controller for said multiple speed transmission having a memory, said transmission controller operable to;

receive from an internal combustion engine controller at least a portion of a fuel map for an internal combustion engine having an operating condition of optimum efficiency, wherein said internal combustion engine controller is operable to control a flow of fuel to said internal combustion engine;

store said portion of said fuel map in said memory;

provide an upshift command when a speed of said internal combustion engine is greater than a speed associated with said operating condition of optimum efficiency by a first predetermined value; and

provide a downshift command when said speed of said internal combustion engine is less than said speed associated with said operating condition of optimum efficiency by a second predetermined value.

11. The multiple speed transmission system of claim 10, further comprising an operator manipulable device operable to enable said transmission controller to provide said upshift command and said downshift command.

12. The multiple speed transmission system of claim 10, wherein said transmission controller is further operable to receive an input from a vehicle operator to enable said transmission controller to provide said upshift command and said downshift command.

13. The multiple speed transmission system of claim 10, wherein said transmission controller is further operable to receives speed data from said internal combustion engine.

14. The multiple speed transmission system of claim 10, wherein said transmission controller is operable to provide said upshift command and said downshift command when said multiple speed transmission is engaged in one of the highest three gears of said multiple speed transmission.

15. The multiple speed transmission system of claim 10, wherein said portion of said fuel map comprises speed data and engine load data.

16. The multiple speed transmission system of claim 10, wherein said first predetermined values and said second predetermined value are less than 200 revolutions per minute.

17. The multiple speed transmission system of claim 10, wherein said multiple speed transmission comprises an automated mechanical transmission, and wherein said transmission controller is further operable to transmit said upshift command and said downshift command to a transmission actuator.

18. The multiple speed transmission system of claim 10, wherein said multiple speed transmission comprises a manual transmission, and wherein said transmission controller is further operable to transmit said upshift command and said downshift command to an indicator.

19. A method of operating a multiple speed transmission having a transmission controller with a memory, comprising:

performing by the transmission controller;

receiving from an internal combustion engine controller data corresponding to a fuel map for an internal combustion engine regarding an operating condition of optimum efficiency, wherein said internal combustion engine controller is operable to control a flow of fuel to said internal combustion engine;

storing said data in said memory;

providing an upshift command when a speed of said internal combustion engine is greater than a speed associated with said operating condition of optimum efficiency by a first predetermined value; and

providing a downshift command when said speed of said internal combustion engine is less than said speed associated with said operating condition of optimum efficiency by a second predetermined value.

20. The method of claim 19, further comprising determining if an enable signal has been received, wherein said providing an upshift command comprises providing an upshift command if said enable signal has been received.

21. The method of claim 19, wherein said transmission controller receives speed data from said internal combustion engine.

22. The method of claim 19, wherein said data corresponding to said fuel map comprises data associated with engine speed and engine load.

23. The method of claim 19, wherein said first predetermined values and said second predetermined value are less than 200 revolutions per minute.

24. The method of claim 19, wherein said multiple speed transmission comprises an automated mechanical transmission, further comprising transmitting said upshift command and said downshift command to a transmission actuator.

25. The method of claim 19, wherein said multiple speed transmission comprises a manual transmission, further comprising transmitting said upshift command and said downshift command to an indicator.