Control apparatus and method for operating a combined hybrid drive and brake system

• US 20090062060A1
• Filed: 08/26/2008
• Published: 03/05/2009
• Est. Priority Date: 08/27/2007
• Status: Active Grant

• Current Assignee: Parker-Hannifin Corporation
• Original Assignee: Parker-Hannifin Corporation
• Inventors: Rink, Steven C.
• Granted Patent: US 8,387,731 B2
• Time in Patent Office: Days
• US Class Current: 477/4
• CPC Class Codes: B60K 6/12 by means of a chargeable fluidic accumulator
• CPC Class Codes: B60T 13/586 the retarders being of the electric type
• 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 10/18 including control of braking systems
• CPC Class Codes: B60W 10/184 with wheel brakes
• CPC Class Codes: B60W 10/24 including control of energy storage means
• 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 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 30/18127 Regenerative braking
• CPC Class Codes: F16H 61/4096 with pressure accumulators
• CPC Class Codes: F16H 61/4148 Open loop circuits
• CPC Class Codes: F16H 61/4157 Control of braking, e.g. preventing pump over-speeding when motor acts as a pump
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

A combined hybrid drive and brake system for use with a rotatably driven mechanism includes a hybrid drive system that is adapted to decelerate a rotatably driven mechanism, accumulate the energy resulting from such deceleration, and use the accumulated energy to subsequently accelerate the rotatably driven mechanism. A brake system is adapted to decelerate the rotatably driven mechanism. A control apparatus is responsive to a request for braking torque for decelerating the rotatably driven mechanism by either (1) the hybrid drive system operating alone, (2) the brake system operating alone, or (3) both the hybrid drive system and the brake system operating in combination.

Claims

1. A combined hybrid drive and brake system for use with a rotatably driven mechanism comprising:

a hybrid drive system that is adapted to decelerate a rotatably driven mechanism, accumulate the energy resulting from such deceleration, and use the accumulated energy to subsequently accelerate the rotatably driven mechanism;

a brake system that is adapted to decelerate the rotatably driven mechanism; and

a control apparatus that is responsive to a request for braking torque for decelerating the rotatably driven mechanism by either (1) the hybrid drive system operating alone, (2) the brake system operating alone, or (3) both the hybrid drive system and the brake system operating in combination.

2. The combined hybrid drive and brake system defined in claim 1 wherein the control apparatus is responsive to the amount of braking torque that is requested for decelerating the rotatably driven mechanism by either (1) the hybrid drive system operating alone, (2) the brake system operating alone, or (3) both the hybrid drive system and the brake system operating in combination.

3. The combined hybrid drive and brake system defined in claim 1 wherein the control apparatus is responsive to a speed of the rotatably driven mechanism for decelerating the rotatably driven mechanism by either (1) the hybrid drive system operating alone, (2) the brake system operating alone, or (3) both the hybrid drive system and the brake system operating in combination.

4. The combined hybrid drive and brake system defined in claim 3 wherein the control apparatus decelerates the rotatably driven mechanism by the brake system operating alone when the speed of the rotatably driven mechanism is greater than a first threshold and by the hybrid drive system operating alone when the speed of the rotatably driven mechanism is lower than the first threshold.

5. The combined hybrid drive and brake system defined in claim 3 wherein the control apparatus decelerates the rotatably driven mechanism by the brake system operating alone when the speed of the rotatably driven mechanism is greater than a first threshold, by both the hybrid drive system and the brake system operating in combination for a predetermined period of time when the speed of the rotatably driven mechanism falls below the first threshold, and by the hybrid drive system operating alone when the speed of the rotatably driven mechanism is lower than the first threshold after the predetermined period of time.

6. The combined hybrid drive and brake system defined in claim 3 wherein the control apparatus decelerates the rotatably driven mechanism by the brake system operating alone when the speed of the rotatably driven mechanism is greater than a first threshold, by the hybrid drive system operating alone when the speed of the rotatably driven mechanism is lower than the first threshold and greater than a second threshold, and by the brake system operating alone when the speed of the rotatably driven mechanism is less than the second threshold.

7. The combined hybrid drive and brake system defined in claim 6 wherein the control apparatus decelerates the rotatably driven mechanism by the brake system operating alone when the speed of the rotatably driven mechanism is greater than a first threshold, by both the hybrid drive system and the brake system operating in combination for a predetermined period of time when the speed of the rotatably driven mechanism falls below the first threshold, and by the hybrid drive system operating alone when the speed of the rotatably driven mechanism is lower than the first threshold after the predetermined period of time.

8. The combined hybrid drive and brake system defined in claim 6 wherein the control apparatus decelerates the rotatably driven mechanism by the hybrid drive system operating alone when the speed of the rotatably driven mechanism is less than the first threshold and greater than the second threshold, by both the hybrid drive system and the brake system operating in combination for a predetermined period of time when the speed of the rotatably driven mechanism falls below the second threshold, and by the brake system operating alone when the speed of the rotatably driven mechanism is lower than the second threshold after the predetermined period of time.

9. The combined hybrid drive and brake system defined in claim 8 wherein while both the hybrid drive system and the brake system are operating in combination, the control apparatus reduces the operation of the hybrid drive system at a predetermined rate.

10. The combined hybrid drive and brake system defined in claim 1 wherein the control apparatus is responsive to both the amount of braking torque that is requested and to a speed of the rotatably driven mechanism for decelerating the rotatably driven mechanism by either (1) the hybrid drive system operating alone, (2) the brake system operating alone, or (3) both the hybrid drive system and the brake system operating in combination.

11. A method of operating a combined hybrid drive and brake system for use with a rotatably driven mechanism comprising the steps of:

(a) providing a hybrid drive system that is adapted to decelerate a rotatably driven mechanism, accumulate the energy resulting from such deceleration, and use the accumulated energy to subsequently accelerate the rotatably driven mechanism;

(b) providing a brake system that is adapted to decelerate the rotatably driven mechanism; and

(c) operating a control apparatus in response to a request for braking torque for decelerating the rotatably driven mechanism by either (1) the hybrid drive system operating alone, (2) the brake system operating alone, or (3) both the hybrid drive system and the brake system operating in combination.

12. The method defined in claim 11 wherein the control apparatus is responsive to the amount of braking torque that is requested for decelerating the rotatably driven mechanism by either (1) the hybrid drive system operating alone, (2) the brake system operating alone, or (3) both the hybrid drive system and the brake system operating in combination.

13. The method defined in claim 11 wherein the control apparatus is responsive to a speed of the rotatably driven mechanism for decelerating the rotatably driven mechanism by either (1) the hybrid drive system operating alone, (2) the brake system operating alone, or (3) both the hybrid drive system and the brake system operating in combination.

14. The method defined in claim 13 wherein the control apparatus decelerates the rotatably driven mechanism by the brake system operating alone when the speed of the rotatably driven mechanism is greater than a first threshold and by the hybrid drive system operating alone when the speed of the rotatably driven mechanism is lower than the first threshold.

15. The method defined in claim 13 wherein the control apparatus decelerates the rotatably driven mechanism by the brake system operating alone when the speed of the rotatably driven mechanism is greater than a first threshold, by both the hybrid drive system and the brake system operating in combination for a predetermined period of time when the speed of the rotatably driven mechanism falls below the first threshold, and by the hybrid drive system operating alone when the speed of the rotatably driven mechanism is lower than the first threshold after the predetermined period of time.

16. The method defined in claim 13 wherein the control apparatus decelerates the rotatably driven mechanism by the brake system operating alone when the speed of the rotatably driven mechanism is greater than a first threshold, by the hybrid drive system operating alone when the speed of the rotatably driven mechanism is lower than the first threshold and greater than a second threshold, and by the brake system operating alone when the speed of the rotatably driven mechanism is less than the second threshold.

17. The method defined in claim 16 wherein the control apparatus decelerates the rotatably driven mechanism by the brake system operating alone when the speed of the rotatably driven mechanism is greater than a first threshold, by both the hybrid drive system and the brake system operating in combination for a predetermined period of time when the speed of the rotatably driven mechanism falls below the first threshold, and by the hybrid drive system operating alone when the speed of the rotatably driven mechanism is lower than the first threshold after the predetermined period of time.

18. The method defined in claim 16 wherein the control apparatus decelerates the rotatably driven mechanism by the hybrid drive system operating alone when the speed of the rotatably driven mechanism is less than the first threshold and greater than the second threshold, by both the hybrid drive system and the brake system operating in combination for a predetermined period of time when the speed of the rotatably driven mechanism falls below the second threshold, and by the brake system operating alone when the speed of the rotatably driven mechanism is lower than the second threshold after the predetermined period of time.

19. The method defined in claim 18 wherein while both the hybrid drive system and the brake system are operating in combination, the control apparatus reduces the operation of the hybrid drive system at a predetermined rate.

20. The method defined in claim 11 wherein the control apparatus is responsive to both the amount of braking torque that is requested and to a speed of the rotatably driven mechanism for decelerating the rotatably driven mechanism by either (1) the hybrid drive system operating alone, (2) the brake system operating alone, or (3) both the hybrid drive system and the brake system operating in combination.