Electric vehicle drive control device and control method therefor

• US 20070107961A1
• Filed: 10/26/2006
• Published: 05/17/2007
• Est. Priority Date: 10/26/2005
• Status: Active Grant

• Current Assignee: Aisin AW Company Limited (Aisin Corp.), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Aisin AW Company Limited (Aisin Corp.), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ibaraki, Ryuji, Shibata, Hiroyuki, Matsubara, Tooru, Iwanaka, Makoto, Takami, Shigeki
• Granted Patent: US 7,762,365 B2
• Time in Patent Office: Days
• US Class Current: 180/65.600
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/40 characterised by the assembly or relative disposition of components
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/10 including control of change-speed gearings
• CPC Class Codes: B60W 10/115 with planetary gears
• 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 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• CPC Class Codes: B60W 2710/081 Speed
• CPC Class Codes: F16H 2037/0873 with switching, e.g. to change ranges
• CPC Class Codes: F16H 2200/0043 the gear ratios comprising four forward speeds
• CPC Class Codes: F16H 2200/2007 with two sets of orbital gears
• CPC Class Codes: F16H 2306/30 characterised by the way or trajectory to a new ratio, e.g. by performing shift according to a particular algorithm or function
• CPC Class Codes: F16H 3/66 composed of a number of gear trains without drive passing from one train to another
• CPC Class Codes: F16H 3/728 with means to change ratio in the mechanical gearing
• CPC Class Codes: F16H 63/502 for smoothing gear shifts
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

An electric vehicle drive control device that includes a first electric motor; a second electric motor; a differential device that includes first, second, and third rotational elements, wherein the first rotational element is connected to the first electric motor, the second rotational element is connected to the second electric motor via a transmission shaft, and the third rotational element is connected to an engine; a transmission for shifting that shifts a speed of a rotation transferred to from the transmission shaft; and a controller that: controls electric motor control processing means for controlling a rotation speed of the first electric motor in conjunction with shifting performed by the transmission; and adjusts electric power adjustment processing means for adjusting an electric power consumptions generated in the first and second electric motors, by controlling an output supplied to the second electric motor in conjunction with the control of the rotation speed of the first electric motor.

Claims

1. An electric vehicle drive control device, comprising:

a first electric motor;

a second electric motor;

a differential device that includes first, second, and third rotational elements, wherein the first rotational element is connected to the first electric motor, the second rotational element is connected to the second electric motor via a transmission shaft, and the third rotational element is connected to an engine;

a transmission that shifts a speed of a rotation transferred from the transmission shaft; and

a controller that;

controls a rotation speed of the first electric motor in conjunction with shifting performed by the transmission; and

adjusts electric power consumptions generated in the first and second electric motors, by controlling an output supplied to the second electric motor in conjunction with the control of the rotation speed of the first electric motor.

2. The electric vehicle drive control device according to claim 1, wherein the controller

controls the rotation speed of the first electric motor so as to suppress a change in an engine rotation speed.

3. The electric vehicle drive control device according to claim 1, wherein the controller

controls an output such that a total electric power consumption, obtained by adding together the electric power consumptions generated in the first and second electric motors, is zero or less.

4. The electric vehicle drive control device according to claim 1, wherein the controller

controls an output such that the second electric motor is powered and driven when electricity is generated in the first electric motor.

5. The electric vehicle drive control device according to claim 1, wherein the controller

controls an output such that regeneration is performed in the second electric motor when the first electric motor is powered and driven.

6. The electric vehicle drive control device according to claim 1, wherein the controller:

calculates an inertia compensating torque that compensates for a change in rotation speed due to inertia as a result of shifting; and

corrects a torque, which serves as a target for the first electric motor, in accordance with the inertia compensating torque.

7. The electric vehicle drive control device according to claim 1, wherein

the differential device is a planetary gear unit formed from a single planetary gear, and

the transmission is provided with first and second gear units formed from single planetary gears.

8. The electric vehicle drive control device according to claim 1, wherein

the first electric motor is a generator,

the second electric motor is a drive motor, and

in the differential device, the first rotational element is a first sun gear connected to the generator, the second rotational element is a first ring gear connected to a the drive motor and the transmission, and the third rotational element is a first carrier connected to the engine.

9. The electric vehicle drive control device according to claim 8, wherein

the first gear unit in the transmission is provided with a second sun gear, a second ring gear, and a second carrier,

the second gear unit in the transmission is provided with a third sun gear, a third ring gear, and a third carrier,

the second sun gear is connected to the first ring gear via a clutch and connected to a case via a brake,

the second ring gear is connected to the third carrier and an output shaft,

the second carrier is connected to the third ring gear, connected to the first ring gear via the clutch, and connected to the case via a one-way clutch and the brake, and

the third sun gear is connected to the first ring gear via the clutch.

11. The electric vehicle drive control device according to claim 2, wherein the controller controls an output such that a total electric power consumption, obtained by adding together the electric power consumptions generated in the first and second electric motors, is zero or less.

12. The electric vehicle drive control device according to claim 2, wherein the controller controls an output such that the second electric motor is powered and driven when electricity is generated in the first electric motor.

13. The electric vehicle drive control device according to claim 2, wherein the controller controls an output such that regeneration is performed in the second electric motor when the first electric motor is powered and driven.

10. A control method for an electric vehicle drive control device comprising a first electric motor;

a second electric motor;

a differential device that includes first, second, and third rotational elements, wherein the first rotational element is connected to the first electric motor, the second rotational element is connected to the second electric motor via a transmission shaft, and the third rotational element is connected to an engine; and

a transmission that shifts a speed of a rotation transferred from the transmission shaft, comprising;

controlling a rotation speed of the first electric motor in conjunction with shifting performed by the transmission; and

adjusting electric power consumptions generated in the first and second electric motors, by controlling an output supplied to the second electric motor in conjunction with the control of the rotation speed of the first electric motor.

14. The method according to claim 10, wherein the rotation speed of the first electric motor is controlled so as to suppress a change in an engine rotation speed.

15. The method according to claim 10, wherein an output is controlled such that a total electric power consumption, obtained by adding together the electric power consumptions generated in the first and second electric motors, is zero or less.

16. The method according to claim 10, wherein an output is controlled such that the second electric motor is powered and driven when electricity is generated in the first electric motor.

17. The method according to claim 10, wherein an output is controlled such that regeneration is performed in the second electric motor when the first electric motor is powered and driven.

18. The method according to claim 10, further comprising:

calculating an inertia compensating torque that compensates for a change in rotation speed due to inertia as a result of shifting; and

correcting a torque, which serves as a target for the first electric motor, in accordance with the inertia compensating torque.

19. The method according to claim 14, wherein an output is controlled such that a total electric power consumption, obtained by adding together the electric power consumptions generated in the first and second electric motors, is zero or less.

20. The method according to claim 14, wherein an output is controlled such that the second electric motor is powered and driven when electricity is generated in the first electric motor.

21. The method according to claim 14, wherein an output is controlled such that regeneration is performed in the second electric motor when the first electric motor is powered and driven.