Retarding control for an electric drive machine

• US 6,986,727 B2
• Filed: 12/23/2003
• Issued: 01/17/2006
• Est. Priority Date: 12/23/2003
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Sopko, Thomas M., Kuras, Brian D.
• Primary Examiner(s): Wright, Dirk
• Application Number:
  US10/742,997
• Publication Number:
  US 20050137060A1
• Time in Patent Office: 756 Days
• Field of Search: 477/4, 607/08, 607/11, 607/13, 607/16, 607/18, 607/19, 180/65.4
• US Class Current: 477/4
• CPC Class Codes: B60K 6/46 Series type
• CPC Class Codes: B60L 2240/36 Temperature of vehicle components or parts
• CPC Class Codes: B60L 50/40 using propulsion power supplied by capacitors
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60L 7/04 for vehicles propelled by dc motors
• CPC Class Codes: B60L 7/12 for vehicles propelled by dc motors
• CPC Class Codes: B60L 7/22 Dynamic electric resistor braking, combined with dynamic electric regenerative braking
• CPC Class Codes: B60L 7/26 Controlling the braking effect
• CPC Class Codes: B60T 13/586 the retarders being of the electric type
• CPC Class Codes: B60T 13/748 acting on electro-magnetic brakes combined with fluid-pressure brake systems B60T13/667
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• 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 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• 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

Abstract

A method of dissipating power in a propelled machine having an electric drive includes converting undesired power to electric power by the electric drive, and driving an internal combustion engine with at least a portion of the electric power prior to substantially dissipating power with any other power dissipating device.

Claims

1. A method of dissipating power in a propelled machine having an electric drive, comprising:

converting undesired power to electric power by the electric drive; and

driving an internal combustion engine with at least a portion of the electric power prior to substantially dissipating power with a resistive grid by providing at least another portion of the electric power to the resistive grid.

2. The method of dissipating power of claim 1, wherein the driving of the internal combustion engine includes driving the engine to a predetermined limit.

3. The method of dissipating power of claim 2, wherein the predetermined limit corresponds to a speed limit of the internal combustion engine.

4. The method of dissipating power of claim 1, further including providing another portion of the electric power to at least one of an energy storage component and an electric powered accessory of the propelled machine.

5. The method of dissipating power of claim 4, further including dissipating undesired power by an application of at least one brake of the propelled machine.

6. The method of dissipating power of claim 1, wherein the providing of the another portion of the electric power to a resistive grid includes providing electric power to a predetermined limit.

7. The method of dissipating power of claim 6, wherein the predetermined limit corresponds to a temperature limit of the resistive grid.

8. The method of dissipating power of claim 1, further including dissipating undesired power by an application of at least one brake of the propelled machine.

9. The method of dissipating power of claim 1, further including simultaneously providing another portion of the electric power to at least one of an energy storage component and an electric powered accessory of the propelled machine, and the resistive grid, and dissipating undesired power by an application of at least one brake of the propelled machine.

10. A method of dissipating power in a propelled machine having an electric drive, comprising:

converting undesired power to electric power by the electric drive;

driving an internal combustion engine with at least a first portion of the electric power;

providing a second portion of the electric power to a resistive girid, the second portion corresponding to at least a portion of electric power exceeding a predetermined dissipation limit of the internal combustion engine; and

dissipating undesired power by an application of at least one brake of the propelled machine.

11. The method of dissipating power of claim 10, wherein the predetermined dissipation limit corresponds to a speed limit of the internal combustion engine.

12. The method of dissipating power of claim 10, further including providing a third portion of the electric power to both an energy storage component and an electric powered accessory of the propelled machine.

13. The method of dissipating power of claim 10, wherein the providing of the second portion of the electric power to the resistive grid includes providing electric power to a predetermined limit.

14. The method of dissipating power of claim 13, wherein the predetermined limit corresponds to a temperature limit of the resistive grid.

15. The method of dissipating power of claim 12, wherein the dissipation of undesired power by an application of at least one brake of the propelled machine occurs substantially simultaneously with said providing of a third portion of the electric power to at least one of an energy storage component and an electric powered accessory of the propelled machine.

16. A method of dissipating undesired power in a propelled machine having an electric drive, comprising:

driving an internal combustion engine by the undesired power;

providing undesired power to at least one of an energy storage component and an electric powered accessory of the propelled machine;

providing undesired power to a resistive grid after the driving an internal combustion engine by the undesired power reaches a maximum limit; and

applying at least one brake of the propelled machine.

17. The method of dissipating undesired power of claim 16, further including providing undesired power to both an energy storage component and an electric powered accessory of the propelled machine.

18. The method of dissipating undesired power of claim 16, wherein the driving of the internal combustion engine includes generating electrical power from the undesired power and sending the electrical power to a reversible generator for driving the internal combustion engine.

19. The method of dissipating undesired power of claim 18, wherein the generated power is supplied to a DC bus prior to sending to the internal combustion engine.

20. The method of dissipating undesired power of claim 16, wherein the providing of undesired power to at least one of an energy storage component and an electric powered accessory includes generating electrical power from the undesired power and sending the electrical power to said at least one energy storage component and electric powered accessory.

21. The method of dissipating undesired power of claim 20, wherein the generated power is supplied to a DC bus prior to sending to at least one of the energy storage component and electric powered accessory.

22. A propelled machine, comprising:

a first means for dissipating undesired power, including an engine means;

a second means for dissipating undesired power, including a resistive grid;

a third means for dissipating undesired power, including a brake means;

an electric drive; and

a controller configured to prioritize the use of one of the first, second, and third dissipating means so that the dissipating means having the highest priority dissipates power to a predetermined limit if more than one dissipating means is required, wherein the first dissipating means has a first priority, the second dissipating means has a second priority, and the third dissipating means has a third priority.