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Hydraulic control system having over-pressure protection

A hydraulic control system and controller technology, applied in the direction of fluid pressure actuation system safety, fluid pressure actuation system components, fluid pressure actuation device, etc., can solve problems such as power drop

Inactive Publication Date: 2015-04-29
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

however, this strategy may still induce unexpected and undesired power drops for the operator

Method used

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  • Hydraulic control system having over-pressure protection
  • Hydraulic control system having over-pressure protection
  • Hydraulic control system having over-pressure protection

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0012] figure 1 An exemplary machine 10 is shown having various systems and components that cooperate to excavate and load earthen material onto a nearby trailer 12 . In the depicted example, machine 10 is a hydraulic excavator. However, it is contemplated that machine 10 could alternatively be embodied as another type of excavation or material handling machine, such as a backhoe, front shovel, road grader, bulldozer, or other similar machine. Machine 10 may include, among other things, an implement system 14 configured to move work tool 16 between a digging position 18 in a ditch or on a pile and a dumping position 20 , eg, over trailer 12 . Machine 10 may also include an operator station 22 for manually controlling implementation system 14 . It is contemplated that machine 10 could perform operations other than truck loading, such as lifting, trenching, material handling, bulk material removal, grading, dozing, and the like, if desired.

[0013] Implement system 14 may in...

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PUM

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Abstract

A hydraulic control system for a machine is disclosed. The hydraulic control system may have a tank, a pump configured to draw fluid from the tank and pressurize the fluid, an actuator, and a control valve configured to direct fluid from the pump to the actuator and from the actuator to the tank to move the actuator. The hydraulic system may also have a main relief valve movable away from a closed position to pass pressurized fluid to the tank when a pressure of the fluid directed to the actuator exceeds a first threshold pressure, and a controller in communication with the pump. The controller may be configured to selectively reduce a displacement of the pump after the main relief valve has moved away from the closed position when the pressure of the fluid directed to the actuator exceeds a second threshold pressure.

Description

technical field [0001] The present invention relates generally to a hydraulic control system and, in particular, to a hydraulic control system with overpressure protection. Background technique [0002] Machines such as excavators, loaders, bulldozers, motor graders, and other types of heavy equipment perform various tasks using one or more actuators supplied with hydraulic fluid by a pump on the machine. These actuators are typically speed controlled based on the actuated position of the operator interface device. For example, an operator interface device such as a joystick, pedal, or other suitable device can be moved to generate a signal indicative of a desired velocity of an associated hydraulic actuator. When an operator moves the interface device, the operator expects the hydraulic actuator to move at an associated predetermined velocity. [0003] In some cases, the pressure of the fluid supplied to the actuator(s) is likely to exceed desired levels. Such overpressu...

Claims

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Application Information

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IPC IPC(8): F15B21/08F15B13/02F15B1/02F15B21/0427
CPCE02F9/2235E02F9/2242E02F9/226E02F9/2292E02F9/2296F15B11/0423F15B2211/2656F15B2211/3052F15B2211/30595F15B2211/20546F15B2211/20576F15B20/007F15B21/042F15B2211/85F15B2211/8603F15B2211/8606F15B2211/6658F15B2211/6652F15B2211/7135F15B2211/7142F15B2211/62F15B2211/6309F15B2211/6346F15B2211/50536F15B2211/327F15B21/0427
Inventor R·N·彼得森A·M·埃格尔加R·塞苏尔
Owner CATERPILLAR INC