Hybrid power drive system and drive method

• US 8,336,653 B2
• Filed: 08/26/2009
• Issued: 12/25/2012
• Est. Priority Date: 08/28/2008
• Status: Active Grant

• Current Assignee: BYD Company Limited
• Original Assignee: BYD Company Limited
• Inventors: Ren, Yi, Niu, Ruru
• Primary Examiner(s): WALTERS, JOHN DANIEL
• Application Number:
  US12/547,683
• Publication Number:
  US 20100051362A1
• Time in Patent Office: 1,217 Days
• Field of Search: 180/65.22, 180/65.265, 180/65.25, 180/65.6, 477/5, 903/909, 903/910, 903/911
• US Class Current: 180/65.6
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 2006/268 Electric drive motor starts the engine, i.e. used as starter motor
• CPC Class Codes: B60K 6/442 Series-parallel switching type
• CPC Class Codes: B60K 6/52 Driving a plurality of drive axles, e.g. four-wheel drive
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/20 including control of steering systems
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• 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: Y02T 10/40 Engine management systems
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

A hybrid power drive system includes an engine, a first motor, a first clutch operatively coupled between the engine and the first motor, a first decelerating mechanism having an input portion operatively coupled between the first clutch and the first motor, where the input portion is configured to receive rotational power from the first motor and/or the engine. The first decelerating mechanism has an output portion operative to drive at least one first wheel, and a second motor is operatively coupled to at least one second wheel through a second decelerating mechanism. An energy storage device is coupled separately to the first motor and to the second motor. The engine, the first clutch and the first motor are connected in sequence, and the second decelerating mechanism and the at least one second wheel are connected in sequence. Various combinations of operating modes are provided to meet energy efficiency requirements and user power demands.

Claims

1. A hybrid power drive system, comprising:

an engine;

a first motor;

a first clutch operatively coupled between the engine and the first motor;

a first decelerating mechanism having an input portion and an output portion, the input portion operatively coupled between the first clutch and the first motor, the input portion configured to receive rotational power from at least one of the first motor and the engine;

the first decelerating mechanism having an output portion operative to drive at least one wheel of a first wheel set;

a second decelerating mechanism having an input portion and an output portion;

a second motor operatively coupled to at least one wheel of a second wheel set through the second decelerating mechanism;

an energy storage device coupled separately to the first motor and to the second motor; and

wherein, the engine, the first clutch and the first motor are connected in sequence, and the second decelerating mechanism and the at least one second wheel are connected in sequence; and

wherein the first and second decelerating mechanisms are configured to decelerate a rotational speed of the corresponding output portion relative to the corresponding input portion, wherein a rotation speed of the corresponding input portion is substantially greater than the rotational speed of the corresponding output portion.

2. The drive system of claim 1, wherein when the first clutch is engaged, power from the engine is transferred to the at least one wheel of the first wheel set through the first clutch and the first decelerating mechanism.

3. The drive system of claim 1, wherein the energy storage device provides electrical power to the first motor, and the first motor provides rotational power to the at least one wheel of the first wheel set through the first decelerating mechanism.

4. The drive system of claim 3, wherein the energy storage device provides electrical power to the second motor, and the second motor provides rotational power to the at least one wheel of the second wheel set through the second decelerating mechanism.

5. The drive system of claim 1, wherein the energy storage device provides electrical power to the second motor, and the second motor provides rotational power to the at least one wheel of the second wheel set through the second decelerating mechanism.

6. The drive system of claim 1, further comprising a second clutch operatively coupled between the first clutch and the first motor, and operatively coupled to the first decelerating mechanism.

7. The drive system of claim 6, wherein when the first clutch is engaged and the second clutch is disengaged, rotational power of the engine is transferred to the first motor through the first clutch so that the first motor generates electrical power to charge the energy storage device.

8. The drive device of claim 7, wherein when the energy storage device provides electrical power to the second motor, and the second motor provides rotational power to the at least one wheel of the second wheel set through the second decelerating mechanism.

9. The drive device of claim 6, wherein when the second clutch is engaged,

braking energy feedback from the at least one first wheel is transferred to the first motor by the first decelerating mechanism and the second clutch;

the first motor generates electrical power and charges the energy storage device;

braking energy feedback received from the at least one second wheel is transferred to the second motor through the second decelerating mechanism;

and the second motor generates electrical power and charges the energy storage device.

10. The drive system of claim 1, further including an external charging interface coupled to the energy storage device and configured to charge the energy storage device from an external power source.

11. A drive method of a hybrid power drive system, the drive method comprising:

providing an engine driving mode;

providing a first motor driving mode;

providing the engine and first motor driving mode;

providing a second motor driving mode;

providing the engine and second motor driving mode;

providing a first motor and second motor driving mode;

providing the engine and dual motors driving mode; and

driving at least one of first wheels and second wheels in one of a plurality of modes including the engine driving mode, the first motor driving mode, the engine and first motor driving mode, the second motor driving mode, the engine and second motor driving mode, the first motor and second motor driving mode, and the engine and dual motors driving mode,

wherein, in the engine driving mode, the engine provides power to drive at least one first wheel,

wherein, in the first motor driving mode, an energy storage device provides electrical power to a first motor, the first motor driving the at least one first wheel,

wherein, in the engine and first motor driving mode, the energy storage device provides electrical power to the first motor, the engine and the first motor simultaneously driving the at least one first wheel,

wherein, in the second motor driving mode, the energy storage device provides electrical power to the second motor, the second motor driving at least one second wheel,

wherein, in the engine and second motor driving mode, the energy storage device provides electrical power to the second motor, the engine and the second motor simultaneously driving the at least one second wheel,

wherein, in the first motor and second motor driving mode, the energy storage device provides electrical power to both the first motor and the second motor, the first motor and the second motor simultaneously driving the at least one first wheel and the at least one second wheel,

wherein in the engine and dual motors driving mode, the energy storage device provides electrical power to the first and second motors, the engine, the first motor and the second motor simultaneously driving the at least one first wheel and the at least one second wheel.

12. The drive method of claim 11,

wherein in the engine driving mode, a first clutch is engaged and the engine provides rotational power to the at least one first wheel through the first clutch and a first decelerating mechanism;

wherein in the first motor driving mode, the energy storage device provides electrical power to the first motor, and the first motor provides rotational power to at least one first wheel through the first decelerating mechanism;

wherein in the engine and first motor driving mode, the first clutch is engaged, the engine provides rotational power to the at least one first wheel through the first clutch and the first decelerating mechanism, the energy storage device provides electrical power to the first motor, and the first motor provides rotational power to the at least one first wheel through the first decelerating mechanism;

wherein in the second motor driving mode, the energy storage device provides electrical power to the second motor, and the second motor provides rotational power to the at least one second wheel through a second decelerating mechanism;

wherein in the engine and second motor driving mode, the first clutch is engaged, the engine provides rotational power to the at least one first wheel through the first clutch and the first decelerating mechanism, the energy storage device provides electrical power to the second motor, and the second motor provides rotational power to the at least one second wheel through the second decelerating mechanism;

wherein in the first motor and second motor driving mode, the energy storage device provides electrical power to the first motor, the first motor provides rotational power to the at least one first wheel through the first decelerating mechanism, the energy storage device provides electrical power to the second motor, and the second motor provides rotational power to the at least one second wheel through the second decelerating mechanism; and

wherein in the engine and dual motor driving mode, the first clutch is engaged, the engine provides rotational power to the at least one first wheel through the first clutch and the first decelerating mechanism, the energy storage device provides electrical power to the first motor, the first motor provides rotational power to the at least one first wheel through the first decelerating mechanism, the energy storage device provides electrical power to the second motor, and the second motor provides rotational power to the at least one second wheel through the second decelerating mechanism.

13. The drive method of claim 11, wherein the drive system further comprising a second clutch operatively coupled between the first clutch and the first motor, and operatively coupled to the first decelerating mechanism, the drive method further comprising controlling the drive system in a self-charging mode.

14. The drive method of claim 13, wherein when the drive system is in a self-charging mode, the first clutch is engaged, the second clutch is disengaged, rotational power of the engine is provided to the first motor through the first clutch, and the first motor generates electrical power to charge the energy storage device.

15. The drive method of claim 14, wherein the energy storage device provides electrical power to the second motor, and the second motor provides rotational power to the at least one second wheel through the second decelerating mechanism.

16. The drive method of claim 13, further comprising controlling the drive system in a regenerative braking mode, wherein

the second clutch is engaged;

braking energy feedback from the at least one first wheel is transferred to the first motor by the first decelerating mechanism and the second clutch;

the first motor generates electrical power and charges the energy storage device;

braking energy feedback received from the at least one second wheel is transferred to the second motor through the second decelerating mechanism;

and the second motor generates electrical power and charges the energy storage device.

17. The drive method of claim 11, wherein the drive system further includes an external charging interface coupled to the energy storage device and configured to charge the energy storage device from an external power source.