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Method and device for preventing spark plug from freezing

A spark plug, preset temperature technology, applied in the direction of machine/engine, mechanical equipment, engine control, etc., can solve the problem of natural gas engine spark plug freezing, affecting the next start and other problems

Active Publication Date: 2019-01-15
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the spark plug of a natural gas engine freezes when the ambient temperature is low and affects the next start, the present invention proposes a method and device for preventing the spark plug from freezing

Method used

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  • Method and device for preventing spark plug from freezing

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Embodiment Construction

[0029] The specific embodiments of the invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0030] figure 1 A flow chart showing a method for preventing spark plug icing provided by this embodiment includes the following steps:

[0031] S1: When the engine stops, the engine ECU controls the engine speed to reach the preset speed value;

[0032] S2: the ECU controls the natural gas engine to stop injecting natural gas, and controls the opening of the throttle valve;

[0033] S3: the ECU detects the engine speed, and when the speed is zero, closes the throttle valve and stops the engine normally.

[0034] Among them, the spark plug is a device that introduces high-voltage current into the cylinder to generate sparks to ignite the combustible mixture; the throttle v...

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Abstract

The invention discloses a method and device for preventing freezing of a spark plug. The method comprises the steps that firstly, when an engine shuts down, an engine electronic control unit (ECU) controls the rotating speed of the engine to reach the preset rotating speed value; secondly, the ECU controls a natural gas engine to stop ejecting natural gas, and a throttle valve is controlled to be opened; and thirdly, the ECU detects the rotating speed of the engine, and when the rotating speed is zero, the throttle valve is closed, and the engine normally shuts down. The engine ECU controls the highest rotating speed of the engine and the aperture of the throttle valve during shutdown, the amount of air sucked in the engine is increased in the shutdown process, and accordingly water vapor left in a cylinder is completely discharged. It is avoided that when the environment temperature is low, water vapor is left, the spark plug is frozen, and next time of engine starting is affected.

Description

technical field [0001] The invention relates to the field of electric control, in particular to a method and device for preventing spark plug from freezing. Background technique [0002] Natural gas engines have difficulty cold starting in cold regions. During the cold zone test, I disassembled the engine spark plug and found that there was ice on the spark plug, which caused the spark plug to work abnormally and made it difficult to start. The main component of natural gas is methane (CH4), so the water content in the exhaust gas produced by the combustion of natural gas engines is relatively high; in addition, natural gas engines need to throttle the intake air under small loads, and cannot effectively scavenge during the intake stroke (exhaust stroke After the end, due to the valve overlap angle, fresh air enters the cylinder and is directly discharged from the exhaust valve), especially during the shutdown process, the throttle valve will be closed, so less gas flows th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D9/04
CPCF02D9/04F02D2200/101
Inventor 宋国梁李少佳任宪丰
Owner WEICHAI POWER CO LTD
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