Method to prevent natural gas engine spark plug from icing in low temperature environment

Abstract

The invention relates to a method for preventing spark plugs from icing in a low-temperature environment of a natural gas engine, comprising the following steps: obtaining the ambient temperature; determining whether the ambient temperature is lower than the artificially preset upper limit temperature threshold for spark plug anti-icing; if the ambient temperature is not lower than the spark plug anti-icing If the ice upper limit temperature threshold is reached, perform the previous step; otherwise, turn on the engine scavenging mode; obtain the ambient temperature again; determine whether the ambient temperature is lower than the artificially preset spark plug anti-icing upper limit temperature threshold, and perform the following operations according to the judgment result: If the ambient temperature is not lower than the spark plug anti-icing upper limit temperature threshold, the engine scavenging mode is turned off, and then the first step is executed; otherwise, the previous step is executed. The invention forms gas convection, improves exhaust efficiency, and may completely discharge water vapor, reduces the probability and severity of icing, and does not cause spark plug flashover; prevents water vapor from entering the combustion chamber; shuts down in time, reduces Device wear and tear, extend battery life.

Description

technical field [0001] The invention relates to the technical field of natural gas engine system control, in particular to a method for preventing spark plugs from freezing in a low temperature environment of a natural gas engine. Background technique [0002] Natural gas engines rely on the combustion of natural gas in the engine cylinder to do work; the current natural gas engine still uses a mixture of natural gas and air, which is ignited by a spark plug; the most important combustion products of natural gas are carbon dioxide and water vapor; although natural gas engines There is an exhaust stroke, which can discharge most of the natural gas combustion products, but there is still a small amount of water vapor that inevitably stays in the engine cylinder. [0003] And because natural gas engines use natural gas as fuel; and one of the characteristics of natural gas is that the calorific value is generally low; therefore, the current mainstream natural gas engines will d...

AI Technical Summary

Problems solved by technology

[0010] 1. Because only the exhaust valve is opened during the exhaust process, while the intake valve is closed, there is no intake air inside the engine, resulting in no gas convection, which makes the exhaust efficiency very low, and the water vapor cannot be completely discharged;

[0011] 2. Since the engine needs to continue to run for a period of time after shutdown, the engine cannot be shut down in time, which not only increases equipment loss, but also increases the risk of engine failure;

[0012] 3. Since the engine will no longer burn natural gas to work after the engine is shut down, during the exhaust time of the natural flameout method, most of the existing technologies rely on the motor to maintain the engine speed, and this process requires the vehicle battery to provide large current support , resulting in a sharp increase in battery power consumption and greatly reducing the life of the vehicle battery

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