Self-supporting internal combustion engine gas fuel supply system and gas bag pressure control method

Abstract

The invention discloses a self-sufficient internal combustion engine gas fuel supply system and a gas bag pressure control method. The system includes an LNG tank, an LNG supply pump, an LNG vaporizer, a gas bag and an NG injection valve; during operation, the liquefied natural gas stored in the LNG tank is Under the action of the LNG supply pump, it flows to the shell side of the LNG vaporizer, where it absorbs heat and turns into gaseous natural gas, which is stored in the gas bag. The NG injection valve injects a certain amount of gaseous fuel into the inlet, and circulates through the heat transfer medium in the high-temperature section of the cooling system. The heat transfer medium flows into the LNG carburetor tube through the three-way valve. After releasing heat, it flows back to the low-temperature section of the cooling system and flows back into the cylinder liner of the internal combustion engine to absorb heat. This cycle continues. The method of the present invention comprehensively adopts fuzzy controller, Smith predictor and artificial immune controller, and can dynamically optimize the LNG supply flow and heat transfer medium flow according to changes in gas bag pressure and NG flow, so as to stabilize the gas bag pressure. In a given region, the nonlinearity of the system and the influence of time delay are well overcome.

Description

technical field [0001] The invention relates to a gas fuel supply system for a self-supporting internal combustion engine and a gas bag pressure control method, belonging to the field of internal combustion engines. Background technique [0002] Compared with traditional petroleum fuels, liquefied natural gas (LNG) has the characteristics of low carbon, high efficiency, high quality and cleanness, and is an ideal alternative fuel for internal combustion engines. Since LNG is stored and transported at a low temperature of -163°C under normal pressure, it is pre-evaporated into gaseous fuel (NG) before it can be burned for work in practical applications. However, compared with gas stations in the current market, gas stations are far less perfect in terms of quantity and regional distribution, which greatly limits the use of LNG on long-distance vehicles (ships, intercity buses and trucks). . In order to break through the shortcomings of few and uneven distribution of gas fil...

AI Technical Summary

Problems solved by technology

However, the classic control is greatly affected by the performance of discrete devices, and the subsystems in the system have a great influence on each other. The automation level is not high, the control effect is not very ideal, and it is prone to failure, which is not conducive to the long-term safe and efficient operation of the system.

Modern control is suitable for control objects with linear and precise mathematical models, but it is too difficult to establish precise mathematical models for control systems such as air bag pressure, so it is not an ideal choice

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