Energy management system for heavy equipment

• US 8,718,845 B2
• Filed: 10/06/2010
• Issued: 05/06/2014
• Est. Priority Date: 10/06/2010
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Onsager, Michael Gordon, Helfrich, Joseph, Perugini, Dave L., Chmiel, Wayne George, Miller, Peter James
• Primary Examiner(s): Holwerda, Stephen
• Application Number:
  US12/899,450
• Publication Number:
  US 20120089280A1
• Time in Patent Office: 1,308 Days
• Field of Search: 604/13, 604/14, 604/16, 604/31, 180/65.265, 180/65.275, 180/65.29, 180/65.245, 307/9.1, 307/10.1, 701/22
• US Class Current: 701/22
• CPC Class Codes: B60L 15/00 Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
• CPC Class Codes: B60R 16/03 for supply of electrical power to vehicle subsystems or for circuit arrangements for charging batteries H02J7/00

Abstract

Heavy equipment includes a body, an electrical bus, and working components coupled to the body and powered by electricity conveyed via the electrical bus. The heavy equipment further includes a generator set providing an electrical output to the electrical bus, an energy storage element configured to be coupled to the electrical bus, and a computerized controller coupled to the energy storage element. The computerized controller includes a logic module for coupling the energy storage element to the electrical bus in advance of a predicted increase in demand upon the electrical bus, where the increase in demand is anticipated by the computerized controller as forthcoming based upon extrapolation, at least in part, from data related to a previous operation of the heavy equipment.

Claims

1. Heavy equipment designed to operate in a substantially repetitive cycle, comprising:

a work implement;

an actuator for operating the work implement;

an electrical bus;

a power source connected to the electrical bus for powering the actuator;

a capacitor configured to be connected to the electrical bus for receiving power from the power source during a portion of the substantially repetitive cycle and for augmenting the power source during another portion of the substantially repetitive cycle;

a computerized controller comprising a logic module for connecting the capacitor to the electrical bus in advance of a predicted demand on the electrical bus to maintain a substantially constant voltage on the electrical bus during the predicted demand and prevent a drop in voltage on the electrical bus that would otherwise result from the predicted demand, wherein the predicted demand is anticipated by the computerized controller as forthcoming based upon extrapolation, at least in part, from data related to a past operation of the heavy equipment.

2. The heavy equipment of claim 1, wherein the data used by the computerized controller for anticipation of the predicted demand comprises data corresponding to a previous iteration of the substantially repetitive cycle.

3. The heavy equipment of claim 1, wherein the data used by the computerized controller for anticipation of the predicted demand comprises data corresponding to an immediately preceding operation of the heavy equipment.

4. The heavy equipment of claim 3, wherein the data used by the computerized controller for anticipation of the predicted demand comprises data corresponding to immediately preceding iterations of the substantially repetitive cycle by the heavy equipment.

5. The heavy equipment of claim 1, wherein the power source comprises a generator set.

6. The heavy equipment of claim 1, wherein the capacitor receives power from the power source to charge the capacitor when demand on the electrical bus is less than an electrical output of the power source.

7. The heavy equipment of claim 6, wherein the computerized controller is configured to decouple the capacitor from the electrical bus when the capacitor is fully charged.

8. The heavy equipment of claim 1, wherein the capacitor comprises an ultra-capacitor.

9. The heavy equipment of claim 1, wherein the actuator comprises a linear actuator.

10. The heavy equipment of claim 1, wherein the power source provides power to the electrical bus at a substantially constant rate regardless of a present loading of the work implement.

11. The heavy equipment of claim 6, wherein the power source is operated such that the substantially constant rate of power provided by the power source is insufficient to provide power for the predicted demand during the substantially repetitive cycle.