STARTER ALTERNATOR ACCESSORY DRIVE SYSTEM FOR A HYBRID VEHICLE

• US 20080039263A1
• Filed: 08/14/2006
• Published: 02/14/2008
• Est. Priority Date: 08/14/2006
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: Usoro, Patrick B.
• Granted Patent: US 7,547,264 B2
• Time in Patent Office: Days
• US Class Current: 475/157
• CPC Class Codes: B60K 25/02 directly from an engine shaft
• CPC Class Codes: B60K 6/26 characterised by the motors or the generators
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/30 including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
• 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 20/40 Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers power-up or power-down of the driveline B60W30/192
• CPC Class Codes: F16H 2200/2005 with one sets of orbital gears
• CPC Class Codes: F16H 3/727 with at least two dynamo electric machines for creating an electric power path inside the gearing, e.g. using generator and motor for a variable power torque path special adapted for a hybrid electric vehicle B60K6/20
• CPC Class Codes: Y10S 903/91 Orbital, e.g. planetary gears

Abstract

The present invention provides an alternator starter accessory drive system for a hybrid vehicle. The starter alternator accessory drive system includes a planetary gear set having a first, second, and third planetary member. An engine is operatively connected to the first planetary member, and a first motor/generator is operatively connected to the second planetary member. A torque transfer device operatively connects a plurality of accessories to the third planetary member. A second motor/generator is operatively connected to either the third planetary member or the torque transfer device. Engine output is transferable through the planetary gear set to drive the accessories at a selectable rate, and the first and second motor/generators are controllable to run the accessories while the engine is off and to re-start the engine.

Claims

1. A starter alternator accessory drive system for a hybrid vehicle comprising:

an engine;

an accessory operatively connected to the engine;

a planetary gear set disposed between the engine and the accessory;

a first motor/generator operatively connected to the planetary gear set; and

a second motor/generator operatively connected to the planetary gear set;

wherein the first and second motor/generators are controllable to power the plurality of accessories at a selectable rate independent of engine speed, and to re-start the engine while simultaneously powering the plurality of accessories.

2. The starter alternator accessory drive system of claim 1, further comprising a plurality of pulleys configured to transfer output from the engine to the accessories.

3. The starter alternator accessory drive system of claim 1, further comprising at least one belt operatively connecting and plurality of pulleys.

4. The starter alternator accessory drive system of claim 1, further comprising a battery configured to transfer power to and receive power from the first and second motor/generators.

5. The starter alternator accessory drive system of claim 1, further comprising a controller operatively connected to the engine, the first motor/generator and the second motor/generator, said controller configured to calculate required speed and output torque values for the first and second motor/generators in order to control the speed at which the plurality of accessories are run.

6. A starter alternator accessory drive system for a hybrid vehicle comprising:

a planetary gear set having a first, second, and third planetary member;

an engine operatively connected to the first planetary member;

a first motor/generator operatively connected to the second planetary member;

a second motor/generator operatively connected to the third planetary member; and

a plurality of accessories operatively connected to the third planetary member;

wherein engine output is transferable through the planetary gear set to drive the plurality of accessories at a selectable rate, and the first and second motor/generators are controllable to run the plurality of accessories while the engine is off and to re-start the engine.

7. The starter alternator accessory drive system of claim 6, wherein the first planetary member is a ring gear member, the second planetary member is a sun gear member, and the third planetary member is a planet carrier member.

8. The starter alternator accessory drive system of claim 6, wherein the first planetary member is a run gear member, the second planetary member is a planet carrier member, and the third planetary member is a ring gear member.

9. The starter alternator accessory drive system of claim 6, wherein the first planetary member is a ring gear member, the second planetary member is a planet carrier member, and the third planetary member is a sun gear member.

10. The starter alternator accessory drive system of claim 6, wherein the first planetary member is a planet carrier member, the second planetary member is a ring gear member, and the third planetary member is a sun gear member.

11. The starter alternator accessory drive system of claim 6, wherein the first planetary member is a planet carrier member, the second planetary member is a sun gear member, and the third planetary member is a ring gear member.

12. The starter alternator accessory drive system of claim 6, wherein the first planetary member is a sun gear member, the second planetary member is a ring gear member, and the third planetary member is a planet carrier member.

13. The starter alternator accessory drive system of claim 6, further comprising a gear assembly operatively connecting the first motor/generator to the second planetary member.

14. The starter alternator accessory drive system of claim 6, further comprising a belt operatively connecting the first motor/generator to the second planetary member.

15. The starter alternator accessory drive system of claim 6, further comprising a chain operatively connecting the first motor/generator to the second planetary member.

16. A starter alternator accessory drive system for a hybrid vehicle comprising:

a planetary gear set having a first, second, and third planetary member;

a first torque transfer device operatively connecting an engine with the first planetary member;

a first motor/generator operatively connected to the second planetary member;

a second torque transfer device operatively connecting a plurality of accessories to the third planetary member; and

a second motor/generator operatively connected to one of the third planetary member and the second torque transfer device;

wherein engine output is transferable through the planetary gear set to drive the plurality of accessories at a selectable rate, and the first and second motor/generators are controllable to run the plurality of accessories while the engine is off and to re-start the engine.

17. The starter alternator accessory drive system of claim 16, wherein the first and second torque transfer devices include a plurality of pulleys connected by a belt member.

18. The starter alternator accessory drive system of claim 16, wherein the first and second torque transfer devices includes a plurality of sprockets connected by a chain member.

19. The starter alternator accessory drive system of claim 16, further comprising a belt operatively connecting the first motor/generator to the second planetary member.

20. The starter alternator accessory drive system of claim 16, further comprising a chain operatively connecting the first motor/generator to the second planetary member.

21. The starter alternator accessory drive system of claim 16, further comprising a gear assembly operatively connecting one of the first and second motor/generators to the planetary gear set.

22. The starter alternator accessory drive system of claim 16, wherein the planetary gear set includes a single-pinion carrier.

23. The starter alternator accessory drive system of claim 16, wherein the planetary gear set includes a double-pinion carrier.