Control method and control system for runaway of diesel engine

A control method and control system technology, applied in engine control, electrical control, fuel injection control, etc., can solve problems such as broken shaft, exhaust sound tightness, and connecting rod bolt breakage

Active Publication Date: 2012-07-18
WEICHAI POWER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the diesel engine has runaway failure, the exhaust sound of the diesel engine will become more and more dense, and there will be a lot of black smoke from the exhaust pipe. Even if the throttle is reduced, the speed cannot be reduced. If emergency measures are not taken, the connecting rod bolts will break and the cylinder head will be damaged. , body, piston and other parts, causing diesel engine pestle cylinder, broken shaft, flywheel rupture, valve and valve spring breakage and other major accidents, even directly threatening personal safety

Method used

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  • Control method and control system for runaway of diesel engine
  • Control method and control system for runaway of diesel engine
  • Control method and control system for runaway of diesel engine

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specific Embodiment approach

[0024] This specific implementation includes the following steps:

[0025] S210) Run the diesel engine to a critical speed, and detect the speed of the diesel engine;

[0026] S220) Obtain the angular acceleration according to the rotational speed;

[0027] S230) Calibrating the acquired angular acceleration as the angular acceleration threshold of the diesel engine;

[0028] The above steps can be carried out before the diesel engine is used or shipped. For example, before the diesel engine leaves the factory, the diesel engine can be run to the critical runaway state through the bench test control system of the diesel engine, and the angular acceleration of the diesel engine in the process can be obtained for calibration before leaving the factory. In addition, the angular acceleration may change from the start of the diesel engine to the critical speed. The detection device can be used to detect the speed of the diesel engine in the process in real time. The calibration unit calcu...

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Abstract

The invention discloses a control method and a control system for runaway of a diesel engine. The control method includes the steps: calibrating an angular acceleration threshold value according to start of the diesel engine to a critical runaway state; acquiring the current angular acceleration of the diesel engine in real time; and reducing the fuel oil supply quantity when the current angular acceleration is larger than the calibrated angular acceleration threshold value. The control method calibrates the angular acceleration threshold value, and a certain time interval is reserved from incontrollable rotational speed to rated rotational speed, so that measures can be taken in advance when the incontrollable rotational speed does not rise violently to the rated rotational speed, namely, using the control method can timely and properly handle a runaway failure in the earlier stage, and further runaway is timely and effectively avoided.

Description

Technical field [0001] The invention relates to the technical field of diesel engines, in particular to a control method and a control system for diesel engine flying. Background technique [0002] Diesel engines (referred to as diesel engines) have the advantages of high power, good economic performance, etc., and also have certain advantages in energy saving and carbon dioxide emissions. Therefore, diesel engines are widely used in many fields. [0003] Diesel engines may have runaway during use. Diesel runaway refers to the failure of the diesel engine to lose control of its speed, and the speed is getting higher and higher, even far exceeding the rated speed of the diesel engine. [0004] There are many reasons for diesel engine runaway, such as excessive fuel supply, lubricating oil flees into the combustion chamber to increase fuel supply, etc.; and runaway faults mainly occur when the load suddenly disappears or decreases during the start or work. Once the diesel engine has a...

Claims

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Application Information

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IPC IPC(8): F02D41/22
CPCY02T10/40
Inventor 韩峰黄国龙马庆镇李振光桂建华张晓琳
Owner WEICHAI POWER CO LTD
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