Compressed natural gas vehicle engines are divided into single-fuel dedicated engines and dual-fuel engines.

The single-fuel dedicated engine uses natural gas as the single fuel, and the engine's own structure has been modified on the basis of giving full play to the characteristics of natural gas so that its overall performance can be greatly improved.

The dual-fuel engine is an additional natural gas fuel supply system on the basis of the original engine. The structural parameters of the engine itself have not been changed, and the design is still based on liquid fuels such as gasoline and diesel. Due to the restriction of the engine structure parameters, the power performance of the natural gas engine has decreased by 10%-20%. The main reason is that the fuel heat input to the engine per unit time is less than that of gasoline and diesel. By appropriately increasing the engine compression ratio, Can improve its power performance, but also increase exhaust emissions, so it is very important to optimize and adjust the combustion conditions of dual-fuel engines.

Experience has shown that if the adjustment is reasonable, the decrease in power performance can be controlled at about 5%, which is acceptable for vehicles driving in cities, but as a dual-fuel vehicle, how to adjust the engine to achieve two The best working conditions that the fuel can adapt to need further study.

The vehicle gas device of a dual-fuel vehicle is mainly composed of three major systems: reserve, supply and control. The reserve system is mainly composed of an inflation valve, high-pressure stop valve, natural gas storage cylinder, high-pressure pipeline, pressure sensor and gas volume display. The supply system is mainly composed of natural gas filters, pressure reducing regulators, power regulators, mixers and so on. The control system is mainly composed of an oil and gas fuel switch, natural gas solenoid valve, gasoline solenoid valve, etc.

When using natural gas as fuel, the 20 MPa compressed natural gas in the gas storage tank is gradually decompressed, and then enters the mixer through the low-pressure pipeline and power valve, and mixes with the air entering through the air filter, and enters through the carburetor channel The engine cylinder burns. A gasoline solenoid valve is installed in the oil circuit, and the remaining components remain unchanged. When gasoline is used, the gasoline solenoid valve is opened, and the gasoline enters the carburetor through the valve and is sucked into the cylinder for combustion.

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