Energy storage and recovery for a tracked machine

• US 20080121448A1
• Filed: 09/28/2007
• Published: 05/29/2008
• Est. Priority Date: 09/29/2006
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Stemler, Eric D., Garnett, Stephen C., Betz, Michael D., Liang, Chih C.
• Granted Patent: US 7,658,250 B2
• Time in Patent Office: Days
• US Class Current: 180/65.3
• CPC Class Codes: B60K 6/12 by means of a chargeable fluidic accumulator
• CPC Class Codes: B60K 6/46 Series type
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 2220/18 Reluctance machines
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 7/08 Controlling the braking effect B60L7/04, B60L7/06 take precedence
• CPC Class Codes: B60L 7/18 Controlling the braking effect B60L7/12, B60L7/14, B60L7/16 take precedence
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• 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 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60Y 2200/25 Track vehicles
• CPC Class Codes: E02F 9/2217 with energy recovery arrangements, e.g. using accumulators, flywheels
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/92 Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Abstract

A system for storing and recovering energy associated with a machine having ground engaging tracks is disclosed. The system includes a power source configured to supply mechanical energy for operation of the machine, and an electric generator operably coupled to the power source. The electric generator is configured to convert at least a portion of the mechanical energy into electric energy. The system further includes an electric motor operably coupled to the electric generator. The electric motor is configured to supply power to the ground engaging tracks. The system includes an energy storage device configured to store energy associated with the machine, and a controller configured to divert a portion of the energy supplied by the power source to the energy storage device while the machine travels in a first direction, and recover energy stored in the energy storage device for use while the machine travels in a second direction.

Claims

1. A system for storing and recovering energy associated with a machine having ground engaging tracks, the system comprising:

a power source configured to supply mechanical energy for operation of the machine;

an electric generator operably coupled to the power source, the electric generator being configured to convert at least a portion of the mechanical energy into electric energy;

an electric motor operably coupled to the electric generator, the electric motor being configured to supply power to the ground engaging tracks;

an energy storage device configured to store energy associated with the machine; and

a controller configured to coordinate operation of the power source, the electric generator, the electric motor, and the energy storage device,

wherein the controller is configured to divert a portion of the energy supplied by the power source to the energy storage device while the machine travels in a first direction, and recover energy stored in the energy storage device for use while the machine travels in a second direction.

2. The system of claim 1, wherein the first direction is forward, and the second direction is reverse.

3. The system of claim 1, wherein the first direction is reverse, and the second direction is forward.

4. A system for storing and recovering energy associated with a machine having ground engaging tracks, the system comprising:

a power source configured to supply mechanical energy for operation of the machine;

an electric generator operably coupled to the power source, the electric generator being configured to convert at least a portion of the mechanical energy into electric energy;

an electric motor operably coupled to the electric generator, the electric motor being configured to supply power to the ground engaging tracks;

an energy storage device configured to store energy associated with the machine; and

a controller configured to coordinate operation of the power source, the electric generator, the electric motor, and the energy storage device,

wherein the controller is configured to divert a portion of energy stored by the energy storage device to the electric motor, such that a portion of demand for power on the power source is at least partially offset by the portion of energy stored by the energy storage device in response to an increase in demand for power associated with operation of the machine.

5. The system of claim 4, wherein the increase in demand for power associated with operation of the machine includes an increase in load on the electric motor.

6. The system of claim 4, wherein the increase in demand for power associated with operation of the machine relates to steering the machine.

7. The system of claim 4, wherein the increase in demand for power associated with operation of the machine relates to operation of a work implement.

8. A system for storing and recovering energy associated with a machine having ground engaging tracks and a work implement, the system comprising:

a power source configured to supply mechanical energy for operation of the machine;

an electrical system including

an electric generator operably coupled to the power source, the electric generator being configured to convert at least a portion of the mechanical energy into electric energy,

an electric motor operably coupled to the electric generator, the electric motor being configured to supply power to the ground engaging tracks, and

a retarding device;

an energy storage device configured to store energy associated with the machine; and

a controller configured to coordinate operation of the power source, the electric generator, the electric motor, the retarding device, and the energy storage device, such that at least one of kinetic energy and potential energy associated with the machine is stored in the energy storage device and recovered to supply energy to the machine.

9. The system of claim 8, wherein the kinetic energy associated with the machine includes motion of the machine, and the retarding device includes a retarding generator configured to convert motion of the machine into electric energy for use by the electrical system.

10. The system of claim 9, wherein the retarding generator is configured to convert motion of the machine into electric energy while the motion of the machine is slowing.

11. The system of claim 9, wherein the retarding generator is configured to convert motion of the machine into electric energy while the vehicle is reversing directions of motion.

12. The system of claim 9, wherein the retarding generator is configured to convert motion of the machine into electric energy while the machine is traveling in reverse direction.

13. The system of claim 8, wherein the controller is configured to transfer energy from the energy storage device to the electrical system while the machine is turning.

14. The system of claim 8, wherein the controller is configured to transfer energy from the energy storage device to the electrical system during operation of the work implement.

15. The system of claim 8, wherein the controller is configured to transfer energy from the energy storage device to the electrical system as the machine accelerates.

16. The system of claim 8, wherein the controller is configured to transfer energy from the energy storage device to the electrical system as the machine accelerates upon reversing directions of motion.

17. The system of claim 8, wherein the controller is configured to transfer energy from the energy storage device during a peak load on the power source, thereby reducing power output requirement of the power source during the peak load.

18. The system of claim 8, wherein the electrical system includes electrically-powered accessories, and the controller is configured to transfer energy from the energy storage device to the accessories.

19. The system of claim 18, wherein the accessories include a heater configured to warm at least one of the power source and air supplied to the power source.

20. The system of claim 8, wherein the potential energy includes energy due to an elevated position of the work implement, and wherein the controller is configured to transfer energy to the energy storage device during lowering of the work implement.