What is the difference between electronic fuel injection and direct injection?

[LaBryce]

The differences between electronic fuel injection and direct injection are as follows: 1. Fuel injection method: Electronic fuel injection can be divided into ordinary electronic fuel injection, single-point fuel injection, and multi-point fuel injection. The forms of fuel injection are similar, but the control precision varies. In contrast, direct injection delivers fuel directly into the cylinder, where it mixes with the air inside. In other words, direct injection is another form of electronic fuel injection. 2. Advantages of each: Multi-point fuel injection engines have a relatively simple structure, more mature technology, and lower requirements for electronic fuel injectors, making them relatively cheaper. Additionally, maintenance and repair costs are comparatively lower. The main advantage of direct injection is that fuel is injected directly into the combustion chamber at extremely high pressure, allowing the computer to more accurately control air intake and fuel injection timing, resulting in better fuel efficiency. 3. Disadvantages of each: Multi-point fuel injection engines are more prone to carbon buildup in the intake tract. Due to their different construction, they can effectively clean the intake valves, cylinders, fuel injectors, intake manifolds, etc., leading to fewer carbon deposit issues compared to direct injection. Direct injection engines lack significant amounts of gasoline in the intake manifold to clean carbon deposits, which can accumulate over time and obstruct airflow. This can lead to increased fuel consumption and reduced engine performance.