HYBRID PROPULSION SYSTEMS

• US 20090156068A1
• Filed: 12/12/2008
• Published: 06/18/2009
• Est. Priority Date: 12/12/2007
• Status: Active Grant

• Current Assignee: Aspin Kemp & Associates Holding Corp., FOSS Maritime Company (Saltchuk Resources Incorporated), Xeropoint Energy
• Original Assignee: Aspin KEMP & Associates, FOSS Maritime Company (Saltchuk Resources Incorporated), Xeropoint Energy
• Inventors: ELDRIDGE, John, ASPIN, Jason, BOYD (nee Reynolds), Elizabeth, McKENNA, Rick, JAMER, Paul, WRIGHT, Chris, STRATTON, John, BARRETT, John, STEWART, Tim
• Granted Patent: US 8,062,081 B2
• Time in Patent Office: Days
• US Class Current: 440/3
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 5/08 comprising more than one engine
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60L 1/00 Supplying electric power to auxiliary equipment of vehicles circuit arrangements for charging batteries H02J7/00
• CPC Class Codes: B60L 2200/32 Waterborne vessels
• CPC Class Codes: B60L 2220/42 with use of more than one motor
• CPC Class Codes: B60L 50/15 with additional electric power supply with capacitors charged by engine-driven generators B60L50/40; with batteries charged by engine-driven generators B60L50/61
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: B60W 10/06 including control of combustion engines
• 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: B60Y 2200/42 Amphibious vehicles
• CPC Class Codes: B63B 35/66 Tugs towing or pushing equipment B63B21/56
• CPC Class Codes: B63H 2021/202 of hybrid electric type
• CPC Class Codes: B63H 2021/205 the second power unit being of the internal combustion engine type, or the like, e.g. a Diesel engine
• CPC Class Codes: B63H 21/20 the vessels being powered by combinations of different types of propulsion units
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• 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 70/5236 : Renewable or hybrid-electric solutions

Abstract

A hybrid propulsion and energy management system for use in marine vessels and other variable demand propulsion applications monitors and draws energy from various energy sources dynamically to implement multiple operating modes and provide efficient system operation across a range of propulsive demands, altering the operation and output of various energy sources in response to propulsive load demands, hotel loads and auxiliary energy demands. The propulsion system incorporates at least two propulsive sources, including at least one main propulsive engine and at least one motor-generator unit arranged to drive a common output shaft, and the energy management system dynamically shifts operation of each of the two sources to satisfy propulsive demands. The main propulsive engine and the motor-generator unit are capable of driving the common output shaft both independently and simultaneously. The motor-generator unit(s) are available to operate either as a motor driving the output shaft or as a generator supplying energy to the energy distribution system.

Claims

1. A propulsion system comprising:

at least two sources providing energy for propulsion and an energy management system that controls operation of each of the at least two sources, wherein the at least two sources include at least one main propulsive engine and at least one motor-generator unit arranged to drive a common output shaft and linked to a common propulsive output member, and the energy management system dynamically shifts operation of each of the at least two sources to satisfy propulsive demands.

2. A propulsion system of claim 1, wherein the common output shaft and propulsive output member are drivable both independently by the main propulsive engine and the motor-generator unit, and simultaneously by the main propulsive engine and the motor-generator unit.

3. A propulsion system of claim 1, wherein the motor-generator unit is linked to an electrical distribution system providing bidirectional energy flow between the motor-generator unit and the electrical distribution system under the control of the energy management system.

4. A propulsion system of claim 3, wherein the main propulsive engine is independently capable of providing energy for propulsion by driving the common output shaft and propulsive output member and driving the motor-generator unit as a generator, supplying output energy to the electrical distribution system.

5. A propulsion system of claim 3, wherein the EMS controls operation of the motor-generator unit as a motor for propulsion and as a generator for supplying energy to the electrical distribution system.

6. A propulsion system of claim 3, wherein the electrical distribution system is additionally linked to at least one auxiliary generator that, during operation, supplies energy to the electrical distribution system.

7. A propulsion system of claim 3, wherein the electrical distribution system is additionally linked to an energy storage system providing bi-directional energy flow between the electrical distribution system and the energy storage system.

8. A propulsion system of claim 3, wherein the electrical distribution system comprises a DC bus.

9. A propulsion system of claim 8, wherein the electrical distribution system additionally comprises an AC bus linked to the DC bus providing bi-directional flow between DC and AC buses.

10. A propulsion system of claim 3, wherein the electrical distribution system comprises a DC bus and the EMS maintains substantially constant DC voltage on the DC bus during operation of the propulsion system and supplies energy in excess of that required to maintain constant DC voltage to the energy storage system.

11. A propulsion system of claim 1, wherein the propulsive output member is a propeller or a propulsion Z-drive

12. A propulsion system of claim 3, additionally comprising a variable frequency drive linking the energy distribution system and the motor-generator unit and specifying the output speed and/or torque of the motor-generator unit.

13. A propulsion system of claim 1, comprising two main propulsive engines and two motor-generators, each main propulsive engine arranged to drive a common output shaft in combination with a motor-generator and linked to a common propulsive output member, whereby each common output shaft and propulsive output member are drivable both independently by the respective main propulsive engine and motor-generator and simultaneously by the respective main propulsive engine and the motor-generator.

14. A propulsion system of claim 1, wherein the EMS operates the main propulsive engine only in high efficiency modes of operation.

15. A propulsion system of claim 1, wherein the EMS controls operation of the main propulsive engine to limit the torque output of the main propulsive engine to a selected level.

16. A propulsion system of claim 15, wherein the EMS controls operation of the main propulsive engine to limit the torque output to a selected level at or below a not to exceed level specified by a regulatory agency.

17. A propulsion system of claim 15, wherein the EMS operates the motor-generator unit as a motor providing additional propulsive energy to the common output shaft and common propulsive member to satisfy propulsive demands when operation of the main propulsive engine fails to satisfy propulsive demands.

18. A propulsion system of claim 1, wherein the motor-generator unit is an AC motor-generator.

19. A propulsion system of claim 1, wherein the motor-generator unit is an AC squirrel cage induction motor.

20. A propulsion system of claim 1, additionally comprising an energy distribution system and at least one winch coupled to the energy distribution system, wherein the EMS controls energy supply to the winch from the energy distribution system.

21. A propulsion system of claim 20 wherein the at least one winch is coupled to the energy distribution system through a variable frequency drive system.

22. A propulsion system of claim 20, wherein the winch additionally supplies regenerative energy to the energy distribution system.

23. A vessel incorporating the propulsion system of claim 1.

24. A vessel of claim 20, wherein the vessel is a tugboat.

25. A hybrid power system for use on a marine vessel comprising at least two independently operable drive sources arranged on a common driveline providing energy for propulsion, an energy distribution bus, an energy storage system, and an energy management system (EMS) controlling operation of the at least two sources and controlling energy flow between the at least two sources, the energy distribution bus and the energy storage system, wherein the EMS dynamically operates the two independently operable drive sources and dynamically controls energy flow to satisfy propulsive demands and to maintain a substantially constant voltage on the energy distribution bus.

26. A hybrid power system of claim 25, wherein one of the at least two independently operable drive sources is a motor-generator unit operable in a motor mode using energy from at least one of the energy distribution system and the energy storage system to satisfy propulsive demands.

27. A hybrid power system of claim 26, wherein the motor-generator unit is additionally operable in a motor mode using energy from another independently operable drive source.

28. A hybrid power system of claim 25, wherein the at least two independently operable drive sources include a main drive engine and a motor-generator unit arranged on a common driveline, and the main drive engine and motor-generator are operable to drive the common driveline alternately under control of the EMS.

29. A hybrid power system of claim 28, wherein the main drive engine and the motor-generator are operable to drive the common driveline simultaneously under control of the EMS.

30. A hybrid power system of claim 28, wherein the main drive engine is operable to simultaneously drive the common driveline and provide energy to operate the motor-generator in a motor mode or a generator mode.

31. A hybrid power system of claim 25, additionally comprising at least one auxiliary generator providing energy to the energy distribution bus.

32. A hybrid power system of claim 25, additionally comprising at least one winch coupled to and drawing power from the energy distribution bus during operation of the system.

33. A hybrid power system of claim 32, wherein the at least one winch is coupled to and drawing power from the energy distribution bus through a variable frequency drive system.

34. A hybrid power system of claim 25, comprising two main engines, two motor-generators and two common drivelines, each main engine arranged on a common driveline with a motor-generator, wherein each common driveline is drivable both independently by the respective main engine and motor-generator and simultaneously by the respective main engine and motor-generator.

35. A vessel incorporating the hybrid power system of claim 25.

36. A vessel of claim 35, wherein the vessel is a tugboat.

37. A method for operating a propulsion system to satisfy variable propulsive demands, wherein the propulsion system comprises at least one main engine and at least one motor-generator unit, and the main engine and the motor-generator unit are configured to drive a common output shaft both independently and simultaneously, the method comprising limiting the torque output of the main engine to a selected level and operating the motor-generator unit as a motor providing additional drive energy to the common output shaft when propulsive demands exceed the selected level of torque output of the main engine.