Method and system for adjusting a pedal map

• US 8,560,143 B2
• Filed: 08/31/2010
• Issued: 10/15/2013
• Est. Priority Date: 08/31/2010
• Status: Active Grant

• Current Assignee: Toyota Motor Corporation
• Original Assignee: Toyota Motor Engineering & Manufacturing North America Incorporated (Toyota Motor Corporation)
• Inventors: Fleming, Matthew Eugene, Francisco, Avernethy
• Primary Examiner(s): MCCULLOUGH, MICHAEL C
• Application Number:
  US12/873,155
• Publication Number:
  US 20120053796A1
• Time in Patent Office: 1,141 Days
• Field of Search: 701/1, 701/36, 701/49
• US Class Current: 701/1
• CPC Class Codes: B60K 26/04 of means connecting initiating means or elements to propulsion unit
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 30/143 Speed control B60W30/16 takes precedence
• CPC Class Codes: B60W 30/1882 characterised by the working point of the engine, e.g. by using engine output chart
• CPC Class Codes: B60W 50/10 Interpretation of driver requests or demands

Abstract

A method and system for adjusting a pedal map, the system includes an automobile which has a pedal map adjustment unit. The pedal map adjustment unit includes a processor, an accelerator pedal, a memory, an input unit, a speed detection unit, and/or a power train. The memory can store a pedal map, which indicates a desired output of the powertrain at particular speed value. The accelerator pedal can collect pedal data, the input unit can collect input data, and the speed detection unit can collect speed data. The processor, using the pedal data and the speed data can adjust pedal curves in the pedal map to intersect with a road load pedal angle curve. The road load pedal angle curve can indicate a pedal depression amount required to maintain the automobile at a particular speed value.

Claims

1. A pedal map adjustment system for an automobile having a powertrain, the pedal map adjustment system comprising:

a memory configured to store pedal map data corresponding to a plurality of pedal curves, each of the plurality of pedal curves associating an output of the powertrain with an automobile speed value for a given pedal depression amount of a plurality of stored pedal depression amounts;

an accelerator pedal configured to generate pedal data indicating a desired pedal depression amount to reach a first automobile speed value corresponding to a speed at which the automobile is currently travelling; and

a processor connected to the accelerator pedal and the memory, the processor configured to adjust a pedal curve of the plurality of pedal curves based on the pedal data and control an output of the powertrain based on the adjusted pedal curve, such that the automobile travels at the first automobile speed value when the accelerator pedal is depressed at the desired pedal depression amount.

2. The system of claim 1 further comprising an input unit configured to generate input data indicating when the pedal map data should be adjusted, wherein the processor only adjusts the pedal map data when the input data indicates that the pedal map data should be adjusted.

3. The system of claim 1 wherein the processor is further configured to adjust a slope of the pedal curve.

4. The system of claim 1 further comprising an automobile speed detection unit connected to the processor and configured to detect automobile speed data corresponding to automobile speed values,

wherein the processor is further configured to select the pedal curve from the plurality of pedal curves and adjust the selected pedal curve based on the detected automobile speed data and the pedal map data.

5. The system of claim 1 wherein the processor is further configured to adjust a second pedal curve of the plurality of pedal curves to smoothen a transition between at least two pedal depression amounts of the plurality of pedal depression amounts.

6. The system of claim 1 wherein the processor is further configured to maintain the speed at which the automobile is currently travelling while the accelerator pedal is depressed or released to generate the desired pedal depression amount.

7. The system of claim 1 further comprising an automobile speed detection unit connected to the processor and configured to detect automobile speed data corresponding to automobile speed values, wherein the pedal map data includes a road load pedal angle curve, and wherein the processor is configured to select the pedal curve from the plurality of pedal curves based on the pedal data and the automobile speed data and adjust the selected pedal curve to intersect with the road load pedal angle curve.

8. The system of claim 7 wherein the processor is configured to select the pedal curve from a group of available pedal curves in the plurality of pedal curves, wherein the pedal curves in the group of available pedal curves are based on the pedal data and the automobile speed data.

9. The system of claim 7 wherein the road load pedal angle curve indicates for a given automobile speed value, the pedal data required to maintain the automobile speed data at the given automobile speed value.

10. The system of claim 1 wherein the processor is further configured to automatically select the pedal curve that most closely corresponds to the pedal depression amount, and the processor is further configured to adjust a slope of the selected pedal curve based on slope data stored in the memory and the desired pedal depression amount.

11. A vehicle comprising:

a powertrain configured to generate torque outputs; and

a pedal map adjustment unit connected to the powertrain, the pedal map adjustment unit including;

a memory configured to store pedal map data corresponding to a plurality of pedal, each of the plurality of pedal curves associating a torque output of the powertrain with a vehicle speed value for a given pedal depression amount of a plurality of stored pedal depression amounts,

a pedal configured to adjust an acceleration of the vehicle and generate pedal data, the pedal data corresponding to a pedal depression amount and indicating a desired adjustment of a pedal depression amount required to maintain the vehicle at a first vehicle speed value corresponding to a speed at which the vehicle is currently travelling, and

a processor connected to the pedal, the memory, and the powertrain, the processor configured to adjust a pedal curve of the plurality of pedal curves based on the pedal data and control a requested torque output of the powertrain based on the pedal map data and the adjusted pedal curve, such that the vehicle travels at the first vehicle speed value when the accelerator pedal is depressed at the desired pedal depression amount.

12. The vehicle of claim 11 further comprising an input unit configured to generate input data indicating when the pedal map data should be adjusted wherein the processor only adjusts the pedal map data when the input data indicates that the pedal map data should be adjusted.

13. The vehicle of claim 11 wherein the pedal map adjustment unit further includes a vehicle speed detection unit connected to the processor and configured to detect vehicle speed data corresponding to vehicle speed values, and the processor is further configured to select the pedal curve from the plurality of pedal curves and adjust the selected pedal curve based on the vehicle speed data.

14. The vehicle of claim 13 wherein the pedal map data includes a road load pedal angle curve, and the processor is further configured to select a pedal curve from the plurality of pedal curves and adjust the selected pedal curve to intersect with the road load pedal angle curve, and wherein the plurality of pedal curves are based on the pedal data and the vehicle speed data.

15. The vehicle of claim 14 wherein the road load pedal angle curve indicates for a given vehicle speed value, the pedal data required to maintain the vehicle speed data at the given vehicle speed value.

16. A method of adjusting a pedal map of an automobile having a powertrain, the method comprising:

storing, using a memory, pedal map data corresponding to a plurality of pedal curves, each of the plurality of pedal curves associating an output of the powertrain with an automobile speed value for a given pedal depression amount of a plurality of stored pedal depression amounts;

generating, using a pedal, pedal data corresponding to a pedal depression amount to reach a first automobile speed value corresponding to a speed at which the automobile is currently travelling, thereby indicating a desired adjustment to the pedal map;

analyzing, using a processor, the pedal data and the input data;

adjusting, using the processor, a pedal curve of the plurality of pedal curves based on the pedal data; and

controlling, using the processor, an output of the powertrain based on the adjusted pedal curve such that the automobile travels at the first automobile speed value when the accelerator pedal is depressed at the desired pedal depression amount.

17. The method of claim 16 further comprising:

generating, using an input unit, input data indicating when the pedal map data should be adjusted; and

adjusting the pedal map data only when the input data indicates that the pedal map data should be adjusted.

18. The method of claim 16 further comprising:

detecting, using an automobile speed detection unit, automobile speed data corresponding to automobile speed values; and

selecting, using the processor, the pedal curve from the plurality of pedal curves, wherein the step of adjusting the pedal map data is based on the automobile speed data and the pedal map data.

19. The method of claim 16 further comprising:

detecting, using an automobile speed detection unit, automobile speed data corresponding to automobile speed values;

selecting, using the processor, the pedal curve from the plurality of pedal curves; and

adjusting, using the processor, the selected pedal curve to intersect with a road load pedal angle curve based on the pedal data and the automobile speed data.

20. The method of claim 19 wherein the plurality of pedal curves are based on the pedal data and the automobile speed data, and the road load pedal angle curve indicates for an automobile speed value, the pedal data required to maintain the automobile speed data at the automobile speed value.