Control method and control device of dual-fuel engine

Abstract

The embodiment of the invention discloses a control method and a control device of a dual-fuel engine. The control method comprises the following steps that water temperature of the engine, ambient temperature and temperature after inter-cooling are obtained; if the temperature after inter-cooling is detected to be greater than a flashpoint of methanol and the water temperature of the engine and/or the ambient temperature is larger than the flashpoint of the methanol, the dual-fuel engine is controlled to be started according to a diesel and methanol dual-fuel mode. According to the control method, the diesel and methanol are used as the dual fuels to intervene in the starting process of the engine, the methanol has the advantages of high cleanness, environmental friendliness and low cost,the fuel cost in the engine starting process in the pure diesel fuel mode can be reduced, and the problem of poor emission of the engine can be solved; the starting success rate is high, and the problem that starting is difficult in a pure methanol fuel mode is solved; the dual-fuel engine has the advantages of good combustion stability and low engine noise after entering the operation stage, andthe problems that combustion stability is poor and engine noise is large when the pure diesel fuel mode is switched to another fuel mode are avoided.

Description

technical field [0001] The embodiments of the present invention relate to engine technology, and in particular to a control method and device for a dual-fuel engine. Background technique [0002] With the continuous improvement of energy saving and emission reduction requirements, improving engine efficiency and reducing emissions has become the main research direction of the automotive industry today. At present, the main fuel in the automobile industry includes diesel oil. Under the background of increasingly prominent energy problems and environmental pollution problems, methanol has become the most potential alternative fuel in the automobile industry due to its high cleanliness and environmental protection characteristics. Methanol has the advantages of rich sources, high production capacity, low price, and convenient storage and transportation. Its physical and chemical properties such as high octane number and low cetane number make methanol mostly used in ignition en...

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide a dual-fuel engine control method and device to solve the problems of high fuel costs and poor engine emissions that exist in the start-up phase of existing diesel-methanol dual-fuel mode engines

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