Engine fuel supplying technique of liquefied natural gas vehicles (LNGV)

Abstract

The invention relates to an engine fuel supplying technique of liquefied natural gas vehicles (LNGV) and belongs to the field of engine fuel supplying technique of gas vehicles. An LNGV bottle with an economic valve and an internal check valve is selected for controlling and adjusting the extracted pressure of gas in the bottle; a natural gas high-pressure gas tank or a compressed natural gas (CNG) bottle is selected for storing high-pressure natural gas; the natural gas high-pressure gas tank or the CNG bottle is connected with the LNGV bottle by a pressure-reducing valve; the set pressure of the pressure-reducing valve is higher than the maximum of the inlet pressure of the natural gas engine and simultaneously the difference of the two pressure values can compensate the pressure loss of natural gas from the LNGV bottle to the engine. The engine fuel supplying technique meets the working conditions that the stored pressure of the LNGV bottle is low, the inlet pressure requirement ofthe natural gas engine is higher and the pressure fluctuation is smaller, and leads the natural gas engine to work stably and reliably under the rated inlet pressure.

Description

technical field [0001] The present invention relates to a novel liquefied natural gas vehicle (LNGV) fuel system. The main purpose is to meet the low storage pressure of LNG bottles for heavy-duty liquefied natural gas vehicles and the high demand for engine gas inlet pressure, and belongs to the field of gas vehicle engine fuel supply technology. Background technique [0002] At present, the engines of liquefied natural gas vehicles in use are mainly imported engines. Imported engines have low requirements on intake pressure and can meet a wide range of intake pressure (0.35Mpa-1.0Mpa). According to the characteristics of imported engines, the existing liquefied natural gas Natural gas vehicle fuel systems can ensure that LNGV engines work under optimal conditions. With the rapid development of compressed natural gas vehicles (CNGV) in China, domestic natural gas engines have also been widely used. Recently, with the rapid development of my country's LNG industry and the ...

AI Technical Summary

Problems solved by technology

The advantage of using this technology is that the cost is low, and the disadvantage is that the pressure of the vehicle bottle is not easy to control, especially after the vehicle is stopped, the self-pressurization system continues to work, the pressure of the vehicle bottle rises quickly, and the safety valve of the vehicle bottle will open quickly, reducing safety and economy

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