Electrically operated vehicle driving controller, electrically operated vehicle driving control method and its program

• US 7,353,094 B2
• Filed: 05/24/2004
• Issued: 04/01/2008
• Est. Priority Date: 06/06/2003
• Status: Active Grant

• Current Assignee: Aisin AW Company Limited (Aisin Corp.)
• Original Assignee: Aisin AW Company Limited (Aisin Corp.)
• Inventors: Takeuchi, Taketo, Iwatsuki, Ken, Okoshi, Toshio
• Primary Examiner(s): Chin; Gary
• Application Number:
  US10/851,206
• Publication Number:
  US 20040249518A1
• Time in Patent Office: 1,408 Days
• Field of Search: 701/22, 180 651- 655, 180/65.8
• US Class Current: 701/22
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• 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 2240/425 Temperature
• CPC Class Codes: B60L 2240/525 Temperature of converter or components thereof
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 2510/087 Temperature
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60W 30/1843 Overheating of driveline components B60W30/186 takes precedence
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

An electrically operated vehicle driving controller has an electrically operated machine driving section for operating an electrically operated machine; a driving section temperature detecting section for detecting the driving section temperature of the electrically operated machine driving section; a limit ratio calculating processor for calculating a limit ratio for limiting the torque of the electrically operated machine on the basis of the driving section temperature; a rotating speed calculating processor for calculating the rotating speed of the electrically operated machine; and a limit torque calculating processor for calculating an electrically operated machine limit torque corresponding to an electrically operated machine maximum torque set corresponding to the rotating speed on the basis of the limit ratio. Because the torque of the electrically operated machine is limited in a limit ratio corresponding to the temperature of the electrically operated machine, it is possible to prevent the characteristics of the electrically operated machine from being reduced.

Claims

1. An electrically operated vehicle driving controller, comprising:

an electrically operated machine driving section for operating an electrically operated machine;

a driving section temperature detecting section for detecting the driving section temperature of the electrically operated machine driving section;

limit ratio calculation processing means for calculating a limit ratio for limiting the torque of the electrically operated machine on the basis of the driving section temperature;

rotating speed calculation processing means for calculating the rotating speed of the electrically operated machine;

limit torque calculation processing means for calculating an electrically operated machine limit torque on the basis of an electrically operated machine maximum torque set correspondingly to the rotating speed and the limit ratio;

electrically operated machine target torque calculation processing means for calculating an electrically operated machine target torque showing a target value of the electrically operated machine torque; and

correcting torque calculation processing means for correcting the electrically operated machine target torque on the basis of the electrically operated machine limit torque when the electrically operated machine target torque is greater than the electrically operated machine limit torque.

2. The electrically operated vehicle driving controller according to claim 1, wherein the limit ratio is gradually relaxed such that the torque of the electrically operated machine approaches the electrically operated machine maximum torque when the rotating speed belongs to a predetermined low speed rotation area.

3. The electrically operated vehicle driving controller according to claim 2, wherein the limit ratio is relaxed such that the torque of the electrically operated machine approaches the electrically operated machine maximum torque in a constant changing ratio when the rotating speed belongs to the predetermined low speed rotation area.

4. The electrically operated vehicle driving controller according to claim 3, wherein the electrically operated machine limit torque is increased as the rotating speed is reduced, and is decreased as the rotating speed is increased.

5. The electrically operated vehicle driving controller according to claim 2, wherein the electrically operated machine limit torque is increased as the rotating speed is reduced, and is decreased as the rotating speed is increased.

6. The electrically operated vehicle driving controller according to claim 1, wherein the limit ratio is relaxed such that the torque of the electrically operated machine approaches the electrically operated machine maximum torque in a constant changing ratio when the rotating speed belongs to a predetermined low speed rotation area.

7. The electrically operated vehicle driving controller according to claim 6, wherein the electrically operated machine limit torque is increased as the rotating speed is reduced, and is decreased as the rotating speed is increased.

8. The electrically operated vehicle driving controller according to claim 1, wherein the electrically operated machine limit torque is increased as the rotating speed is reduced, and is decreased as the rotating speed is increased.

9. The electrically operated vehicle controller of claim 1, wherein the correcting torque calculation processing means make the electrically operated machine target torque to equal the electrically operated machine limit torque when the electrically operated machine target torque is greater than the electrically operated machine limit torque.

10. The electrically operated vehicle driving controller according to claim 1, wherein the electrically operated machine maximum torque is set by the rotating speed and a voltage supplied to the electrically operated machine driving section.

11. An electrically operated vehicle driving control method comprising:

detecting a driving section temperature of an electrically operated machine driving section for operating an electrically operated machine;

calculating a limit ratio for limiting the torque of the electrically operated machine on the basis of the driving section temperature;

calculating the rotating speed of the electrically operated machine;

calculating an electrically operated machine limit torque on the basis of an electrically operated machine maximum torque set to correspond to the rotating speed and the limit ratio;

calculating an electrically operated machine target torque showing a target value of the electrically operated machine torque; and

correcting the electrically operated machine target torque on the basis of the electrically operated machine limit torque when the electrically operated machine target torque is greater than the electrically operated machine limit torque.

12. The electrically operated vehicle driving method according to claim 11, wherein the electrically operated machine limit torque is increased as the rotating speed is reduced, and is decreased as the rotating speed is increased.

13. A computer readable storage medium having stored thereon a computer program that, when executed, causes a computer to perform at least the steps of:

calculating a limit ratio for limiting the torque of an electrically operated machine on the basis of a driving section temperature of an electrically operated machine driving section for operating the electrically operated machine;

calculating the rotating speed of the electrically operated machine;

calculating an electrically operated machine limit torque on the basis of an electrically operated machine maximum torque set to correspond to the rotating speed and the limit ratio;

calculating an electrically operated machine target torque showing a target value of the electrically operated machine torque; and

correcting the electrically operated machine target torque on the basis of the electrically operated machine limit torque when the electrically operated machine target torque is greater than the electrically operated machine limit torque.