DC bus voltage control

• US 8,880,250 B2
• Filed: 02/28/2011
• Issued: 11/04/2014
• Est. Priority Date: 02/28/2011
• Status: Active Grant

• Current Assignee: Deere & Company
• Original Assignee: Deere & Company
• Inventors: Wu, Long, Tremel, Chris J., Vilar, Zimin W., Gilman, Alan K., Shaw, Robert
• Primary Examiner(s): To, Tuan C.
• Assistant Examiner(s): Troost, Aaron L
• Application Number:
  US13/036,765
• Publication Number:
  US 20120221183A1
• Time in Patent Office: 1,345 Days
• Field of Search: 701/22, 702/57, 702/64, 702/65, 318/767, 318/798
• US Class Current: 701/22
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/527 Voltage
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y10S 903/906 Motor or generator

Abstract

Provided is a method and controller for controlling a vehicle dc bus voltage. The method includes generating a parameter. The parameter is based on a reference dc bus voltage squared. The method includes controlling the vehicle dc bus voltage based on the parameter and a detected dc bus voltage. The method may also include generating another parameter based on a power demand associated with at least one of a motoring mode operation and a generating mode operation of a traction motor associated with the vehicle. The power demand is indicated in a message received via a dedicated high speed data bus. The method includes controlling the vehicle dc bus voltage based on the another parameter.

Claims

1. A method of controlling a vehicle dc bus voltage, the method comprising:

generating a first parameter, by a controller, the first parameter being based on a reference dc bus voltage squared;

generating a second parameter, by the controller, the second parameter being based on a detected dc bus voltage squared; and

controlling, by the controller, the vehicle dc bus voltage, the controlling including,

determining a square error difference between the first parameter and the second parameter,

determining a sign of the square error difference and whether to adjust the sign of the square error difference based on a mode of a generator associated with the vehicle, the mode being one of a motoring mode operation and a generating mode, and

controlling the vehicle dc bus voltage based on the square error difference and the sign of the square error difference.

2. The method of claim 1, comprising:

generating a third parameter, the third parameter being based on the square error difference of the first and the second parameters; and

generating a fourth parameter, the fourth parameter being generated based on a function having the third parameter as an input, wherein

the controlling step includes controlling the vehicle dc bus voltage based on the fourth parameter.

3. The method of claim 2, wherein the function is a proportional integral (PI) function.

4. The method of claim 2, comprising:

receiving a fifth parameter, the fifth parameter being based on a demand associated with at least one of a motoring mode operation and a generating mode operation of a motor associated with the vehicle, wherein

the controlling step includes controlling the vehicle dc bus voltage based on the fourth parameter and the fifth parameter.

5. The method of claim 4, comprising:

determining a sum of the fourth parameter and the fifth parameter; and

limiting the sum of the fourth parameter and the fifth parameter based on a torque limit associated with the mode of the generator associated with the vehicle, wherein

the controlling step includes controlling the vehicle dc bus voltage based on the limited sum of the fourth parameter with the fifth parameter.

6. The method of claim 4, wherein the fifth parameter is based on,

a rotational speed associated with the mode of the generator associated with the vehicle, and

a rotation direction associated with the mode of the generator associated with the vehicle.

7. The method of claim 4, wherein the demand is a feed forward power demand.

8. The method of claim 1, wherein controlling the vehicle bus voltage includes controlling a torque value associated with the generator to control the vehicle dc bus voltage.

9. A controller for controlling a vehicle dc bus voltage, the controller comprising:

a first module configured to generate a first parameter, the first parameter being based on a reference dc bus voltage squared;

a second module configured to generate a second parameter, the second parameter being based on the detected bus voltage squared; and

a voltage controller configured to,

determine a square error difference between the first parameter and the second parameter,

determine a sign of the square error difference and whether to adjust the sign of the square error difference based on a mode of a generator associated with the vehicle, the mode being one of a motoring mode operation and a generating mode, and

control the vehicle dc bus voltage based on the square error difference and the sign of the square error difference.

10. The controller of claim 9, comprising:

a summing module configured to generate a third parameter, the third parameter being based on the first and the second parameters, wherein

the voltage controller is configured to generate a fourth parameter, the fourth parameter being generated based on a function having the third parameter as an input, and

the voltage controller is configured to control the vehicle dc bus voltage based on the fourth parameter.

11. The controller of claim 10, wherein the function is a proportional integral (PI) function.

12. The controller of claim 10, comprising:

a feed forward module configured to generate a fifth parameter, the fifth parameter being based on a demand associated with at least one of a motoring mode operation and a generating mode operation of a motor associated with the vehicle, wherein

the voltage controller is configured to control the vehicle dc bus voltage based on the fourth parameter and the fifth parameter.

13. The controller of claim 12, comprising:

determining a sum of the fourth parameter and the fifth parameter; and

a torque limit module configured to limit the sum of the fourth parameter and the fifth parameter based on a torque limit associated with the mode of the generator associated with the vehicle, wherein

the voltage controller is configured to control the vehicle dc bus voltage based on the limited sum of the fourth parameter with the fifth parameter.

14. The controller of claim 12, wherein the fifth parameter is based on,

a rotational shaft speed associated with the mode of the generator associated with the vehicle, and

a rotation direction associated with the mode of the generator associated with the vehicle.

15. The controller of claim 9, wherein the voltage controller is a voltage proportional integral (PI) controller.

16. The controller of claim 9, wherein controlling the vehicle bus voltage includes controlling a torque value associated with the generator to control the vehicle dc bus voltage.