Compressed natural gas vehicle engines are divided into single-fuel dedicated engines and dual-fuel engines.
The single-fuel engine uses natural gas as the single fuel, and on the basis of giving full play to the characteristics of natural gas, the engine's own structure has been modified specifically, so that its overall performance can be greatly improved.
The dual-fuel engine transformation technology is to add a 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 constraints of the engine structural parameters, the power performance of the natural gas engine has been reduced 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. Appropriately increasing the engine compression ratio, Can improve its power performance, but also increase exhaust emissions, so it is very important to optimize the combustion conditions of dual-fuel engines.
Experience has shown that if the adjustment is reasonable and appropriate, the decrease in power performance can be controlled at about 5%, which is acceptable for vehicles driving in cities.
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