ELECTRIC OPERATING SYSTEM FOR OPERATING AT LEAST ONE ELECTRIC EQUIPMENT FOR A WORK MACHINE AND WORK MACHINE COMPRISING AN ELECTRIC OPERATING SYSTEM

• US 20120292918A1
• Filed: 08/13/2009
• Published: 11/22/2012
• Est. Priority Date: 08/13/2009
• Status: Active Grant

• Current Assignee: Volvo Construction Equipment AB (Volvo AB)
• Original Assignee: Volvo Construction Equipment AB (Volvo AB)
• Inventors: Bichler, Oliver, Richter, Alfred, Steinbrecher, Günther
• Granted Patent: US 8,749,080 B2
• Time in Patent Office: Days
• US Class Current: 290/1.R
• CPC Class Codes: B60K 6/105 the accumulator being a flywheel
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 2200/40 Working vehicles
• 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: 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 2200/41 Construction vehicles, e.g. graders, excavators
• CPC Class Codes: F02B 67/04 of mechanically-driven auxiliary apparatus
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

An electric operating system for operating at least one electric equipment article for a work machine is provided. This electric operating system includes a flywheel generator for generating electric power needed for the operation of the at least one electric equipment article. Further, the system includes a power electronic device connected to the output of the flywheel generator for adapting a voltage level provided by the flywheel generator to a voltage level required for the operation of the at least one electric equipment article. Finally, the system includes a connector device adapted for to be connectable to the power electronic device and the at least one electric equipment article when the at least one electric equipment article is attached to, or arranged at, the work machine for providing the at least one electric equipment article with electric power at the adapted voltage level.

Claims

1. An electric operating system for operating at least one electric equipment article for a work machine, comprising

(i) a flywheel generator for generating electric power needed for the operation of the at least one electric equipment article, wherein the at least one electric equipment article is an attachment device, that is attachable to, or arrangeable at, the work machine, or wherein the at least one electric equipment article is an auxiliary device which is electrically drivable by an electric motor;

(ii) an power electronic device connected to the output of the flywheel generator for adapting a voltage level provided by the flywheel generator to a voltage level required for the operation of the at least one electric equipment article; and

(iii) a connector device adapted for to be connectable to the power electronic device and the at least one electric equipment article when the at least one electric equipment article being attached to, or arranged at, the work machine for providing the at least one electric equipment article with electric power at the adapted voltage level.

2. The electric operating system according to claim 1, wherein, in working machines comprising a combustion engine, the flywheel generator is arranged on an output shaft of the combustion engine.

3. The electric operating system according to claim 1, wherein an energy buffer is coupled to the flywheel generator and/or the power electronic device.

4. The electric operating system according to claim 3, wherein the energy buffer is chargeable by the flywheel generator separate from a charging system of a starter battery of the combustion engine.

5. The electric operating system arrangement according to claim 3, wherein the energy buffer is a storage battery with an electrical potential of at least twice of the electrical potential of the starter battery of the combustion engine.

6. The electric operating system arrangement according to claim 3, wherein the energy buffer has an electric potential between ca. 50 and ca. 1000 Volt.

7. The electric operating system according to claim 1, wherein the at least one electric equipment article is a magnetic plate magnetized by an electromagnet.

8. A work machine comprising a combustion engine and an electric operating system according to claim 1.

9. The work machine according to claim 8, wherein the flywheel generator is arranged on an output shaft of the combustion engine.

10. The work machine according to claim 8, wherein the electric equipment article is an attachment device that is attachable to, or arrangeable at, the work machine, or wherein the electric equipment article (60) is electrically drivable by an electric motor.

11. The work machine according to claim 8, wherein at least one additional energy buffer is provided and wherein the additional energy buffer is charged by the flywheel generator separate from a starter battery of the combustion engine.

12. The electric operating system according to claim 2, wherein the flywheel generator is arranged on the output shaft between the combustion engine and a hydraulic pump.

13. The work machine according to claim 9, wherein the flywheel generator is arranged on the output shaft between the combustion engine and a hydraulic pump.

14. The work machine according to claim 10, wherein the attachment device is a magnetic plate.