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Method of reducing fuel consumption in loaders, excavators, backhoe loaders and the like

A loader and machine technology, applied in the direction of earth mover/excavator, machine/engine, fuel injection control, etc., can solve the problem of major fuel requirements prevailing

Pending Publication Date: 2021-01-29
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, outside of periods when maximum torque is required, significant fuel requirements may prevail

Method used

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  • Method of reducing fuel consumption in loaders, excavators, backhoe loaders and the like
  • Method of reducing fuel consumption in loaders, excavators, backhoe loaders and the like
  • Method of reducing fuel consumption in loaders, excavators, backhoe loaders and the like

Examples

Experimental program
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Embodiment Construction

[0021] figure 1 A backhoe loader 100 is shown that uses an internal combustion engine (not shown) to provide ground propulsion via wheels 110 and to provide implement propulsion. Backhoe loader 100 has two implements, backhoe 120 and loader 130 . Each of backhoe 120 and loader 130 may be hydraulically driven. The hydraulic system driving the implement may be powered by a hydraulic pump which itself is powered by the internal combustion engine.

[0022] exist figure 1 In the illustrated embodiment, a backhoe 120 is shown with a bucket attachment 121 and a loader is shown with a fork attachment 131 . These accessories can be replaced by other accessories. A coupling can be provided to facilitate this replacement.

[0023] In the case of a backhoe 120, the machine can be controlled so that the implement can only be used when there is no ground propulsion.

[0024] In the case of a loader 130, the machine can be controlled such that the loader can be used concurrently with g...

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PUM

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Abstract

The invention relates to a method of reducing fuel consumption in a machine with an internal combustion. The machine has a hybrid mode, in which the engine provides simultaneous ground propulsion viaa torque converter and hydraulic implement propulsion via a hydraulic pump. The engine controller uses a first engine map that defines primary operating constraints, the method comprising obtaining and implementing a torque limit that falls within the primary operating constraints 520, wherein if a torque demand exceeds the limit then the engine speed will drop 560, and if the ratio between the engine and ground propulsion drops below a threshold then the torque limit will be removed and the engine will reinstate the primary operating constraints. If the speed drops below a threshold speed, the torque limit may increase gradually. If the engine speed drops below a second threshold speed for a period of time, the torque limit may be removed, and primary operating constraints may be reinstated.

Description

technical field [0001] The present disclosure relates to machines that use internal combustion engines for a variety of different purposes, such as for ground propulsion and for implement propulsion. Background technique [0002] Machines such as loaders, excavators and backhoe loaders can use a single internal combustion engine to provide ground propulsion through a transmission and implement propulsion through a hydraulic pump. [0003] In ground propulsion mode, the first throttle can be used to control engine speed. An engine map can determine the available torque for a particular speed. The operator selects the appropriate gear (using the transmission) and engine speed (using the throttle) to achieve the desired ground propulsion, taking into account the terrain, grade and load, as necessary. [0004] In implement propulsion mode, the engine is disengaged from the machine propulsion by placing the transmission in neutral and the engine powers the hydraulic pump instea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/00F02D29/02E02F9/20
CPCF02D31/007F02D29/02F02D41/3005F02D41/0002E02F9/2066F02D2250/18F02D2250/26F02D29/04B60W10/30B60W30/188B60W2050/0026B60W20/15B60W10/06B60W10/08B60W2300/17E02F9/2075
Inventor R·N·哈珀
Owner CATERPILLAR INC