Characteristics of carburetor, EFI and direct injection technology
Features of EFI fuel supply: multiple sensors are used to measure intake air flow and temperature, engine speed and temperature, computer chip is used to calculate and control fuel output and ignition angle, and electromagnetic piston pump is used to actively inject fuel, thus realizing computerized control of engine operation. It can achieve very fine control effect, and has remarkable effects on fuel saving and environmental protection.
The characteristics of direct injection fuel supply: similar to the variable high-pressure fuel injection pump of diesel engine, the fuel is directly injected into the cylinder before the igniter angle, and the output and speed of the engine are controlled by the fuel injection quantity like a diesel engine. The structural principle is simpler than that of carburetor, but the technical details are more diverse; Stratified combustion is easy to realize, and the key issues are ignition timing and fuel vaporization. Different from the traditional diesel engine, the cylinder compression ratio is not so high, and there is a special ignition device, which is more suitable for the two-stroke form.