HYDRAULIC SYSTEM FOR HEAVY EQUIPMENT

• US 20110056194A1
• Filed: 11/03/2010
• Published: 03/10/2011
• Est. Priority Date: 09/10/2009
• Status: Abandoned Application

• Current Assignee: Bucyrus International Incorporated (Caterpillar Incorporated)
• Original Assignee: Bucyrus International Incorporated (Caterpillar Incorporated)
• Inventors: Miller, Peter, Helfrich, Joseph, Onsager, Michael G., Chmiel, Wayne G., Wojcicki, Mark
• Application Number:
  US12/938,897
• Publication Number:
  US 20110056194A1
• Time in Patent Office: Days
• US Class Current: 60/428
• CPC Class Codes: E02F 9/2242 including an electronic controller
• CPC Class Codes: E02F 9/2292 Systems with two or more pumps
• CPC Class Codes: F15B 11/17 using two or more pumps
• CPC Class Codes: F15B 2211/20515 Electric motor
• CPC Class Codes: F15B 2211/20576 with multiple pumps
• CPC Class Codes: F15B 2211/265 Control of multiple pressure sources
• CPC Class Codes: F15B 2211/2654 one or more pressure sources having priority
• CPC Class Codes: F15B 2211/3059 having multiple valves for multiple output members
• CPC Class Codes: F15B 2211/3138 the positions being discrete
• CPC Class Codes: F15B 2211/31547 having multiple pressure sources and multiple output members
• CPC Class Codes: F15B 2211/633 representing a state of the prime mover, e.g. torque or rotational speed
• CPC Class Codes: F15B 2211/6333 representing a state of the pressure source, e.g. swash plate angle
• CPC Class Codes: F15B 2211/6346 representing a state of input means, e.g. joystick position
• CPC Class Codes: F15B 2211/6652 Control of the pressure source, e.g. control of the swash plate angle
• CPC Class Codes: F15B 2211/71 Multiple output members, e.g. multiple hydraulic motors or cylinders
• CPC Class Codes: F15B 2211/781 one or more output members having priority
• CPC Class Codes: F15B 2211/857 Monitoring of fluid pressure systems

Abstract

Heavy equipment includes first and second hydraulic pumps, and first and second hydraulic actuators, where the first hydraulic actuator facilitates a first work function of the heavy equipment and the second hydraulic actuator facilitates a second work function of the heavy equipment. The heavy equipment further includes valving and a computerized controller. The valving is configured to allow the first hydraulic pump to be coupled to the first hydraulic actuator and the second hydraulic actuator, and to allow the second hydraulic pump to be coupled to the first hydraulic actuator and the second hydraulic actuator. The computerized controller is coupled to the valving, and has a logic module. The logic module provides instructions to the computerized controller to operate the valving as a function of inputs from an operator command, a sensor input, and prioritization logic associated with the first and second work functions, so as to optimize performance of the work functions facilitated by the hydraulic actuators with respect to available output of the hydraulic pumps.

Claims

1. Heavy equipment, comprising:

a first hydraulic pump;

a second hydraulic pump;

a first hydraulic actuator facilitating a first work function of the heavy equipment;

a second hydraulic actuator facilitating a second work function of the heavy equipment;

valving configured to allow the first hydraulic pump to be coupled to the first hydraulic actuator and the second hydraulic actuator, and to allow the second hydraulic pump to be coupled to the first hydraulic actuator and the second hydraulic actuator; and

a computerized controller coupled to the valving, and having a logic module, wherein the logic module provides instructions to the computerized controller to operate the valving to distribute hydraulic fluid among the actuators as a function of inputs from an operator command, a sensor input, and prioritization logic associated with the first and second work functions, so as to optimize performance of the work functions facilitated by the hydraulic actuators with respect to available output of the hydraulic pumps.

2. The heavy equipment of claim 1, wherein the valving is configured to couple both the first and second hydraulic pumps to the same actuator of either the first or second actuators at the same time.

3. The heavy equipment of claim 2, wherein the prioritization logic comprises a priority table providing an order of priority for the first and second work functions.

4. The heavy equipment of claim 3, wherein the priority table is updated by the computerized controller during operation of the heavy equipment.

5. The heavy equipment of claim 4, further comprising:

a third hydraulic actuator, and

wherein the valving allows the first hydraulic pump to be coupled to any of the first, second, and third actuators, and allows the second hydraulic pump to be coupled to any of the first, second, and third actuators.

6. The heavy equipment of claim 5, further comprising:

a manifold, wherein the valving is associated with the manifold, and wherein the first and second hydraulic pumps deliver hydraulic fluid to the manifold and the first, second, and third hydraulic actuators receive hydraulic fluid from the manifold.

7. The heavy equipment of claim 6, wherein the computerized controller controls the speed of the first and second hydraulic pumps.

8. The heavy equipment of claim 7, wherein the first work function relates to moving a working implement of the heavy equipment, and the second work function relates to locomotion of the heavy equipment.

9. A hydraulic system, comprising:

a plurality of hydraulic pumps;

a plurality of hydraulic actuators facilitating work functions of the hydraulic system;

a manifold comprising a plurality of valves for controlling a flow of hydraulic fluid from the plurality of hydraulic pumps to the plurality of hydraulic actuators, wherein the plurality of valves of the manifold are configured to allow each of the plurality of hydraulic pumps to be coupled to any one of the plurality of hydraulic actuators while not being coupled to the others of the plurality of hydraulic actuators; and

a computerized controller coupled to the manifold, and having a logic module, wherein the logic module provides instructions to the computerized controller to operate the plurality of valves of the manifold to distribute hydraulic fluid flowing through the manifold among the plurality of actuators as a function of inputs from an operator command, a sensor input, and prioritization logic associated with the work functions, so as to optimize performance of the work functions facilitated by the plurality of hydraulic actuators with respect to available output of the plurality of hydraulic pumps.

10. The hydraulic system of claim 9, wherein the prioritization logic comprises a priority table providing an order of priority for the work functions.

11. The hydraulic system of claim 10, wherein the priority table is updated by the computerized controller during operation of the hydraulic system.

12. The hydraulic system of claim 11, wherein the plurality of valves of the manifold comprises solenoid valves.

13. The hydraulic system of claim 12, wherein the manifold includes a solenoid valve associated with a coupling between each hydraulic pump of the plurality of hydraulic pumps and each hydraulic actuator of the plurality of hydraulic actuators.

14. The hydraulic system of claim 13, wherein each hydraulic pump of the plurality of hydraulic pumps comprises an inverter, an electric motor, and pistons, and wherein the computerized controller operates the inverter.

15. Heavy equipment, comprising:

a body;

an articulated arm extending from the body;

a first actuator facilitating a first work function of the heavy equipment comprising raising and lowering the articulated arm;

a second actuator facilitating a second work function of the heavy equipment comprising moving the body of the heavy equipment;

a source of pressurized hydraulic fluid;

a manifold comprising a plurality of valves for distributing to the first and second actuators hydraulic fluid received from the source of pressurized hydraulic fluid; and

a computerized controller operating the manifold as a function of prioritization logic related to the first and second work functions, wherein the prioritization logic is updated by the computerized controller during operation of the heavy equipment.

16. The heavy equipment of claim 15, further comprising:

a first sensor associated with the first work function; and

a second sensor associated with the second work function,

wherein during operation of the heavy equipment the computerized controller updates the distribution of the hydraulic fluid from the manifold to the first and second actuators based upon feedback from the first and second sensors.

17. The heavy equipment of claim 16, wherein the prioritization logic comprises a priority table providing an order of priority for the first and second work functions.

18. The heavy equipment of claim 17, wherein the prioritization logic is updated in response to conditions external to the heavy equipment.

19. The heavy equipment of claim 18, further comprising an interface through which an operator provides inputs used by the computerized controller for operating the manifold.

20. The heavy equipment of claim 19, wherein the first actuator is a hydraulic cylinder facilitating movement of the articulated arm, and the second actuator is a hydraulic motor facilitating movement of the body.