What is the Difference Between Electronic Fuel Injection and Direct Injection in Cars?
1 Answers
Below is a comparison of the differences between electronic fuel injection and direct injection: 1. Comparison of Fuel Injection Methods: Electronic fuel injection can be divided into conventional electronic fuel injection, single-point fuel injection, and multi-point fuel injection. The forms of fuel injection are largely similar, where fuel is injected into the intake manifold to mix with air before entering the cylinder for combustion, with increasingly mature control precision. In contrast, direct injection delivers fuel directly into the cylinder, where it then mixes with air entering from the intake manifold before combustion. This process eliminates intermediate steps. Direct injection can also be considered another form of electronic fuel injection. 2. Comparison of Their Advantages: Multi-point fuel injection has a relatively simple structure, more mature technology, and does not require as high a fuel injection pressure as direct injection, thus placing lower demands on electronic fuel injectors and being relatively cheaper. In terms of reliability and post-maintenance, it is clearly more cost-effective. Additionally, multi-point fuel injection engines have lower fuel quality requirements. The greatest advantage of direct injection lies in the injection of fuel at extremely high pressure directly into the combustion chamber. With significant advancements in electronic control systems in recent years, the computer's interpretation and control of air intake and fuel injection timing have become more precise, enabling stratified combustion and lean combustion. Therefore, it offers superior performance in fuel efficiency and power compared to multi-point fuel injection technology.
