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Automatic idling control method for digger engine

A technology of idle speed control and engine, applied in the direction of engine control, machine/engine, mechanical equipment, etc., can solve the problems of large change in engine speed, increase fuel consumption, affect engine life and reliability, etc., to improve power matching, guarantee The effect of responsiveness and dynamics

Inactive Publication Date: 2008-12-31
SANY HEAVY MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it also has the following disadvantages: the engine speed varies greatly, which affects the life and reliability of the engine; when the engine speed fluctuates greatly, it will increase fuel consumption and reduce the economical efficiency of construction machinery

Method used

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  • Automatic idling control method for digger engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: A method for automatic idle speed control of an excavator engine. The secondary target speed of the engine is set, and the secondary target speed is 50 to 300 rpm lower than the target speed in the working state; a high idle speed and a low idle speed are set, The high idle speed is 300-500 rpm higher than the low idle speed; set the pilot pressure threshold, the value range is 5-20 bar; set the first idle time between 0.5 and 5 seconds, and the second idle time Between 0.5 and 5 seconds; in the working state, detect the pilot pressure, when the pilot pressure is zero and lasts for the first idle time, adjust the engine to a high idle state, and continue to maintain the second idle time, adjust the engine to a low idle state ;In the state of high idle speed or low idle speed, when it detects that the pilot pressure is greater than zero and less than the pilot pressure threshold, adjust the engine to the sub-target speed, and when it detects that the pilot p...

Embodiment 2

[0016] Embodiment two: see attached figure 1 As shown, an excavator engine automatic idle speed control method, the engine rated speed is 2100rpm, the target speed when the throttle gear is the largest is taken as 2100rpm, the secondary target speed is taken as 2000rpm, the high idle speed is taken as 1700rpm, and the low idle speed is taken as 1300rpm, the threshold value of the pilot pressure under light load is 10bar.

[0017] When the controller detects that all the pilot pressures are less than 10bar, immediately reduce the engine speed from the target speed 2100rpm to the sub-target speed 2000rpm, when all the pilot pressures are zero and last for 2 seconds, adjust the engine to enter the high idle speed 1700rpm , when the controller detects that all the pilot pressures are zero and the high idle state lasts for 3 seconds, adjust the engine to enter the low idle speed 1300rpm, when the engine is in the high idle state or low idle state, the controller detects that there ...

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Abstract

The invention discloses a digger engine auto idling control method, characterized in that: setting engine sub-target speed lower than working-state target speed by 50-300r / min; setting high idling speed higher than low idling speed by 300-500r / min; setting precursor pressure threshold valve 5-20 Pa; setting first idle time and second idle time; in the working state, when precursor pressure is zero and lasts the first idle time, regulating to high idling state and lasting the second idle time, and then regulating to low idling state; when precursor pressure is greater than zero and less than the precursor pressure threshold, regulating the engine to the sub-target speed and when greater than the precursor pressure threshold, regulating the engine to the target speed. And the invention adopts two-stage speed reduction, overcoming the defect of high energy consumption caused by big rise and fall of engine speed; and uniting engine power, economy and quickness.

Description

technical field [0001] The invention relates to an idle speed control of an engine for engineering machinery, in particular to an idle speed control method of an excavator engine. Background technique [0002] Small excavators are widely used in foundation excavation of housing construction and cleaning after completion, urban pipeline laying, farmland water conservancy construction, etc., and have the advantages of flexible construction and high efficiency. However, during the construction process, although the standby time interval is not long, the number of standby times is frequent. During standby, it is necessary to reduce the accelerator and enter the idling state to reduce fuel consumption and noise. Because it is very inconvenient to manually operate the throttle frequently, a structure to realize automatic idling has occurred. [0003] In the prior art, the automatic idling speed control process of the excavator engine is as follows: after the engine is kept under ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D29/00
Inventor 曹显利
Owner SANY HEAVY MACHINERY
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