Method and system for adaptively controlling a hybrid vehicle

• US 7,466,087 B2
• Filed: 03/09/2006
• Issued: 12/16/2008
• Est. Priority Date: 03/09/2006
• Status: Active Grant

• Current Assignee: Deere & Company
• Original Assignee: Deere & Company
• Inventors: Musser, James William
• Primary Examiner(s): Masih; Karen
• Application Number:
  US11/371,795
• Publication Number:
  US 20070210728A1
• Time in Patent Office: 1,013 Days
• Field of Search: 318/53, 318/717, 318/811, 318/700, 318/712, 318/798, 180/65.1, 180/65.3, 701/22, 477/107
• US Class Current: 318/53
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 20/11 using model predictive control [MPC] strategies, i.e. control methods based on models predicting performance utilising navigation and traffic information in the control strategy B60W20/12
• CPC Class Codes: B60W 2556/10 Historical data

Abstract

A method and system for adaptively controlling a hybrid vehicle comprises a recorder for recording a historical load or duty cycle of vehicle during or after operation of the vehicle. A classifier classifies the historical load in accordance with a load category. A controller assigns at least one of a current control curve and a slew rate control curve associated with the load category for a defined time period after the recording of the historical load or if the vehicle is presently operating generally consistent with the load category. At least one of the current control curve and the slew rate control curve, or data representative thereof, are used to control an operation of an electric drive motor of the vehicle for the defined time period.

Claims

1. A method for controlling a hybrid vehicle, the method comprising:

recording a historical load of vehicle for a reference session during or after operation of the vehicle;

classifying the historical load for the reference session in accordance with a load category;

determining whether the vehicle is in a next session immediately following the reference session; and

assigning at least one a respective current control curve and a respective slew rate control curve based on a classified load category for the next session.

2. The method according to claim 1 wherein the classifying comprises classifying the historical load in accordance with at least one of a duty level, a duty cycle, and a usage factor.

3. The method according to claim 1 wherein the classifying comprises one or more of the following:

steady high duty, high duty with marked acceleration and cruising, transient high duty, steady low duty, low duty with marked acceleration and cruising, transient low duty, and default or general purpose.

4. The method according to claim 1 wherein the determining further comprises determining whether a present load category of the present load is generally consistent with the load category of the historical load.

5. The method according to claim 1 wherein the classifying comprises classifying the historical load in accordance with load categories, including a first load category and a second load category, and wherein the assigning comprises assigning at least one of a first current control curve and a first slew rate control curve if the present load is consistent with the first load category and assigning at least one of a second current control curve and a second slew rate control curve if the current load is consistent with the second load category.

6. The method according to claim 1 wherein a user enters at least one of a session identifier, a session duration, and a task identifier to define at least one of the reference session and the next session.

7. The method according to claim 1 further comprising defining the reference session as a period between turning on an ignition switch and turning off the ignition switch of the vehicle.

8. The method according to claim 1 wherein the assigning comprises assigning a current control curve with a maximum current based on the load category and a range of state of charge of the energy storage device associated with a generally constant current.

9. The method according to claim 1 wherein the assigning comprises assigning a slew rate control curve with a maximum slew rate based on the load category and a range of state of charge of energy storage device associated with a generally constant slew rate.

10. A system for controlling a hybrid vehicle, the system comprising:

a recorder for recording a historical load of vehicle for a reference session during or after operation of the vehicle;

a classifier for classifying the historical load for the reference session in accordance with a load category; and

a controller for determining whether the vehicle is in a next session immediately following the reference session;

the controller assigning at least one a respective current control curve and a respective slew rate control curve based on a classified load category for the next session.

11. The system according to claim 10 wherein classifier classifies the historical load in accordance with at least one of a duty level, a duty cycle, and a usage factor.

12. The system according to claim 10 wherein the classifier classifies the historical load as one or more of the following load categories:

steady high duty, high duty with marked acceleration and cruising, transient high duty, steady low duty, low duty with marked acceleration and cruising, transient low duty, and default or general purpose.

13. The system according to claim 10 wherein the classifier determines a present load category of the present load.

14. The system according to claim 10 wherein the classifier classifies the historical load in accordance with load categories, including a first load category and a second load category, and wherein the assigning comprises assigning at least one of a first current control curve and a first slew rate control curve if the present load is consistent with the first load category and assigning at least one of a second current control curve and a second slew rate control curve if the current load is consistent with the second load category.

15. The method according to claim 10 further comprising a user interface for entering at least one of a session identifier, a session duration, and a task identifier to define at least one of the reference session and the next session.

16. The system according to claim 10 wherein the controller assigns a current control curve with a maximum current based on the load category and a range of state of charge of the energy storage device associated with a generally constant current.

17. The system according to claim 10 wherein the controller assigns a slew rate control curve with a maximum slew rate based on the load category and a range of state of charge of energy storage device associated with a generally constant slew rate.