Hybrid power driving system

• US 8,337,351 B2
• Filed: 05/15/2009
• Issued: 12/25/2012
• Est. Priority Date: 05/30/2008
• Status: Active Grant

• Current Assignee: BYD Company Limited
• Original Assignee: BYD Company Limited
• Inventors: Ren, Yi, Niu, Ruru, Liu, Xiaojun
• Primary Examiner(s): Ho, Ha D.
• Assistant Examiner(s): Agendia, Jude
• Application Number:
  US12/466,716
• Publication Number:
  US 20090298634A1
• Time in Patent Office: 1,320 Days
• Field of Search: 475/5, 475/149, 475/150, 475/154, 475/331, 475/317, 477/3, 477/4, 477/5, 477/6, 180/62.21, 180/65.225, 180/65.23, 180/65.245, 180/65.25
• US Class Current: 475/5
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: F16H 3/54 one of the central gears being internally toothed and the other externally toothed
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

A hybrid power driving system includes a planetary gear mechanism having a first rotating component, a second rotating component, and a third rotating component. The system also includes an electric motor operatively coupled to the first rotating component, a clutch, an internal-combustion engine operatively coupled to the first rotating component by the clutch, and a brake operatively coupled to the second rotating component and configured to control the second rotating component in a locked position or in an unlocked position. The third rotating component is operatively coupled to an output end to provide rotational power.

Claims

1. A hybrid power driving system comprising:

a planetary gear mechanism having a planet carrier configured to retain a plurality of planetary gears, a sun gear of the planetary gear mechanism, and a ring gear of the planetary gear mechanism;

an electric motor directly operatively coupled to the planet carrier;

a clutch;

an internal-combustion engine operatively coupled to the planet carrier through the clutch, the internal-combustion engine and the electric motor configured to provide a parallel-driving system and to provide separate power outputs to the planet carrier;

a brake operatively coupled to the sun gear and configured to control the sun gear to operate in a locked position or in an unlocked position; and

the ring gear operatively coupled to an output end to provide rotational power;

wherein the electric motor provides starting power to the engine when the clutch is engaged and the sun gear is in an unlocked position.

2. The hybrid power driving system according to claim 1, wherein the brake is a positive clutch.

3. The hybrid power driving system according to claim 1, wherein the output end is a linkage gear.

4. The hybrid power driving system according to claim 1, wherein the output end transmits the rotational power to the wheels through a gear box.

5. The hybrid power driving system according to claim 1, wherein the electric motor is coupled to the planet carrier via a main shaft having a splined connection.

6. The hybrid power driving system according to claim 1, wherein the electric motor is coupled to the planet carrier by a main shaft, and wherein the main shaft rotates synchronously with the planet carrier.

7. The hybrid power driving system according to claim 1, wherein the hybrid driving system is configured to operate in a pure electric motor driving mode while:

the clutch is disengaged, and

the brake locks the sun gear, and

power from the electric motor is transmitted to the planet carrier, and

the ring gear transmits power to the output end.

8. The hybrid power driving system according to claim 1, wherein the hybrid driving system is configured to operate in a pure engine driving working mode while:

the clutch is engaged, and

the brake locks the sun gear, and

power of the engine is transmitted to the output end through the clutch, the planet carrier, and the ring gear.

9. The hybrid power driving system according to claim 8, wherein the engine drives the electric motor to generate electricity.

10. The hybrid power driving system according to claim 8, wherein the electric motor is in an idle rotating state when the hybrid driving system operates in the pure engine driving working mode.

11. The hybrid power driving system according to claim 1, wherein the hybrid driving system is configured to operate in an engine and electric motor driving working mode while:

the clutch is engaged, and

the brake locks the sun gear, and

power from the electric motor and the engine is transmitted to the output end via the planet carrier and the ring gear.

12. The hybrid power driving system according to claim 1, wherein the hybrid driving system is configured to operate in a parking-generating mode while:

the clutch is engaged, and

the brake unlocks the sun gear, and

the engine drives the electric motor to generate electricity.

13. The hybrid power driving system according to claim 1, wherein the electric motor is configured to start the engine, while:

the clutch is engaged, and

the brake unlocks sun gear, and

wherein rotation of the main shaft of the electric motor is transmitted to the engine via the planet carrier.

14. The hybrid power driving system according to claim 1, wherein the electric motor is configured to convert a portion of mechanical energy received from the planet carrier into electricity.

15. A hybrid power driving system comprising:

a planetary gear mechanism having a planet carrier, a sun gear, and a ring gear;

an electric motor directly operatively coupled to the planet carrier;

a clutch;

an internal-combustion engine operatively coupled to the planet carrier through the clutch, the internal-combustion engine and the electric motor configured to provide a parallel-driving system and to provide separate power outputs to the planet carrier;

a brake operatively coupled to the sun gear and configured to control the sun gear to operate in a locked position or in an unlocked position; and

the ring gear operatively coupled to an output end to provide rotational power;

wherein the electric motor provides starting power to the engine when the clutch is engaged and the sun gear is in an unlocked position.