Method and device for controlling gas supply of dual-fuel engine

Abstract

The invention discloses a method and a device for controlling gas supply of dual-fuel engine, which can effectively solve the problems of starting difficulty in northeast region, and applies closed-loop control to achieve a reasonable air-fuel ratio between air and fuel; when the temperature of coolant is increased, the supply of natural gas is cut off and liquefied gas is supplied for combustion, thus under the premise of ensuring the dynamic performance of the engine, gas is reasonably used; meanwhile, an electronic gas-saving gate device is used, which can overcome the drawbacks of engine accelerograph and guarantee securer and more efficient operation. The method for controlling gas supply of dual-fuel engine comprises the following steps: a softness controlling method for quickly cutting off natural gas and liquefied gas, a closed-loop controlling method for excess air ratio of the natural gas and the liquefied gas, an automatic repairing function for failure, and a bad condition self-learning controlling method. The device for controlling gas supply of dual-fuel engine comprises a supply system for natural gas and liquefied gas, a closed-loop actuator, a supply controlling module and a micro controller, a CAN communication module and a serial-port communication module.

Description

technical field [0001] The invention relates to a dual-fuel engine gas supply control system, in particular to a dual-fuel engine gas supply control method and device. Background technique [0002] At present, the problems of energy and environmental pollution are becoming more and more prominent. While automobile fuel consumption has become a huge cost of automobile operation, automobile exhaust has increasingly become the main factor of urban air pollution. as the main fuel for automobiles. Gas has better fuel economy than diesel and has lower levels of exhaust pollutants. [0003] Gas (natural gas, liquefied petroleum gas) engines have been successfully used on buses in most cities in my country, but in Northeast China, only one kind of fuel has shown great shortcomings: [0004] a. Natural gas engine is the most used gas engine on buses. Its use is not only because of its economy and emission, but more importantly, the increase of natural gas refueling stations in my ...

AI Technical Summary

Problems solved by technology

[0008] Embodiments of the present invention provide a method and device for controlling the gas supply of a dual-fuel engine. Using natural gas to start can effectively solve the problem of difficult start-up in Northeast China. At the same time, closed-loop control is adopted to achieve a reasonable air-fuel ratio between air and fuel. After rising, the supply of natural gas is cut off, and liquefied gas is used for combustion, so that the fuel gas can be used reasonably under the premise of ensuring the power performance of the engine, and the practicability and economy are improved.

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