GDI is a technology that directly injects fuel into the cylinder and mixes the intake air. The advantages are low fuel consumption, high power, and a compression ratio of up to 12. Compared with the general engine of the same displacement, the power and torque are increased by 10%. The air-fuel ratio reaches 40:1, while the air-fuel ratio of a general gasoline engine is 14.7:1. The current disadvantage is that the components are complex, and the price is usually expensive.
The injection pressure has also been further increased, making the fuel atomization more detailed, truly achieving accurate proportional control of fuel injection and mixing with intake air, and eliminating the shortcomings of out-of-cylinder injection.
At the same time, special designs such as nozzle position, spray shape, intake airflow control, and piston crown shape enable the oil and gas to be fully and evenly mixed in the entire cylinder, so that the fuel is fully burned and the energy conversion efficiency is higher.
Therefore, some people think that the in-cylinder direct-injection gasoline engine is a pioneering move to transplant the form of the diesel engine to the gasoline engine.
Variable displacement means that the displacement of the engine is not fixed, but can be changed according to the needs of working conditions to further improve the fuel economy of the car and reduce energy consumption. So how does the direct-injection natural gas vehicle change the displacement?
It mainly controls the intake valve and oil circuit to open or close the work of a certain cylinder. For example, a 6-cylinder variable displacement engine can realize three working modes: 3-cylinder, 4-cylinder, and 6-cylinder according to actual working conditions, so as to reduce fuel consumption and improve fuel economy.
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