Automatic idle speed control method of hybrid power excavating machine

A technology of idle speed control and hybrid power, which is used in earth movers/shovels, construction, etc., can solve the problems of poor engine fuel economy and small load torque, reduce energy consumption, reduce speed fluctuations, and improve fuel economy. sexual effect

Inactive Publication Date: 2012-03-21
ZHEJIANG UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the automatic idling condition, although the engine speed decreases and the load torque is also small, comparing with the universal characteristic curve of the engine, it can be found that the fuel economy of the engine is extremely poor at this time. If the engine efficiency can be improved, it can further save fuel oil

Method used

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  • Automatic idle speed control method of hybrid power excavating machine
  • Automatic idle speed control method of hybrid power excavating machine
  • Automatic idle speed control method of hybrid power excavating machine

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0033] Embodiment 1, figure 1 and figure 2 Combined with an automatic idle speed control method for a hybrid excavator, the following steps are performed in sequence:

[0034] 1) Since the self-weight of the hybrid excavator is 20 tons, set the idle time to 4s, the first idle speed to 1100rpm, the second idle speed to 800rpm, the pilot pressure threshold to 10bar, and the upper and lower limits of the supercapacitor SOC idle charging threshold The value is 0.875 to 0.9.

[0035] 2) By detecting the pilot pressure, judge whether the excavator stops working:

[0036] When the pilot pressure is less than the pilot pressure threshold, it is determined that the excavator stops moving and enters step 3);

[0037] On the contrary, it is determined that the excavator is in the working state; and the automatic idle speed control program is exited; that is, the automatic idle speed function of the hybrid excavator is invalid, that is, it is not executed figure 2 process shown.

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Abstract

The invention discloses an automatic idle speed control method of a hybrid power excavating machine, which comprises the following steps of: firstly, setting idle time and other various numerical values; secondly, judging whether the excavating machine stops working or not by detecting pilot pressure; thirdly, when the work stopping time of the excavating machine exceeds the set idle speed time, turning into the fourth step, and otherwise, exiting an automatic idle speed control program and adjusting the rotating speed of an engine to be a target work rotating speed; fourthly, detecting a current SOC (State of Charge) value of a super capacitor; fifthly, judging whether the excavating machine starts working or not by detecting the pilot pressure in the loading process; sixthly, detecting the current SOC value of the super capacitor; seventhly, adjusting the engine to be a second idle speed; and eighthly, judging whether the excavating machine starts working or not by repeatedly detecting the pilot pressure. According to the method, the fuel economy of the engine can be effectively improved and the phenomenon that the rotating speed of the engine fluctuates in a wide range during loading under the work condition of idle speed is prevented.

Description

technical field [0001] The invention relates to an automatic idling speed control method for a hybrid power hydraulic excavator, which is suitable for construction machinery with oil-electric hybrid configuration. Background technique [0002] With the global environment and energy problems becoming more and more prominent, energy saving and emission reduction technology is the hot spot of current research. However, the engine power utilization rate of excavators is only 20%, and frequent fluctuations in load make engine emissions worse. Oil-electric hybrid technology is the current research The hot spot of the load is cut and the valley is filled by the electric motor, so that the engine operating point is stabilized in the high-efficiency area. [0003] The automatic idle speed condition of the excavator accounts for about 30% of the total running time. The automatic idle speed control method of the traditional hydraulic excavator is: after the operation handle of the exca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/20E02F9/22
Inventor 王庆丰姚洪
Owner ZHEJIANG UNIV
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