What's the difference between EFI and direct injection?
What's the difference between EFI and direct injection?
The biggest difference between EFI and direct injection is the control mode of injection. Direct injection is only mechanical injection, and EFI should be based on air flow, water temperature, throttle opening, knock engine load and other signals.
EFI is a kind of engine, which is quite different from carburetor engine. When the EFI engine is started, it is generally unnecessary to step on the accelerator, because the EFI engine has the functions of cold start and enrichment, automatic cold start and fast idle speed, and both the cold engine and the hot engine can ensure the smooth start of the engine. The EFI engine has high pressure and good fuel atomization quality, which is beneficial to the cold start and transition of vehicles; The fuel injection speed is fast and the penetration distance is long, which is beneficial to dynamic response.
In-cylinder direct injection (GDI) is a technology that directly injects fuel into the cylinder to mix with intake air. Its advantages are low fuel consumption, high power increase and high compression ratio of 12. Compared with the common engine with the same displacement, the power and torque are increased by 10%. At present, the disadvantage is that the components are complex and the price is usually expensive. The injection pressure is further improved, which makes the fuel atomization more detailed, truly realizes the accurate proportional control of fuel injection and intake air mixing, and eliminates the disadvantages of out-of-cylinder injection.
Doesn't the EFI motorcycle have a carburetor?
EFI motorcycle has no carburetor, that is, a whole set of EFI system is used to replace the traditional carburetor. With more and more strict environmental protection requirements, it is only a matter of time before carburetor is replaced by EFI. It is estimated that the carburetor will be eliminated after the implementation of the national standard for motorcycles in July 2065438+2008.
EFI motorcycle adopts EFI technology, carburetor device is cancelled by EFI system device (EFI), and microcomputer (ECU) equipped with EFI special software controls the fuel supply and ignition of the engine in real time. The fuel supply is extremely accurate, so that the engine can reach the best air-fuel ratio and ignition angle at any time under any working condition and any environment, thus reducing fuel consumption, improving emissions and greatly improving the comprehensive performance of motorcycles.
Classification of electric motorcycles:
1, open-loop EFI motorcycle, the function is not necessarily better than carburetor; Closed-loop EFI motorcycles are quite in place, and their functions and functions are basically the same as those of automobiles. Closed-loop EFI motorcycle can adjust the fuel injection quantity of electric nozzle according to the oxygen content in muffler, and can also change the intake pressure according to the change of external atmospheric pressure.
2. EFI engine: The EFI device of motorcycle engine generally consists of fuel injection circuit, sensor group and electronic control unit (ECU). If the fuel injector is installed in the original carburetor position, that is, the whole engine has only one gasoline injection point, it is a single-point EFI; If the injector is installed on the intake pipe of each cylinder, that is, gasoline is injected into the cylinder from multiple places, this is multi-point injection. What's the difference between EFI and direct injection? Does the EFI motorcycle have a carburetor @20 19?