The Difference Between Direct Injection and Multi-Point Fuel Injection
2 Answers
Here are the differences between direct injection and multi-point fuel injection: 1. Fuel Consumption: Direct injection has lower fuel consumption, while multi-point fuel injection has lower requirements for fuel quality. 2. Components: Both direct injection and multi-point fuel injection have complex structures and higher costs. 3. Operation: In a direct injection engine, high-pressure fuel is injected into the combustion chamber in a fine mist. As it evaporates, it absorbs heat, cooling the cylinder and thereby reducing emissions. Multi-point fuel injection involves injectors installed on the intake pipe of each cylinder, with fuel sprayed into the cylinder from multiple locations. 4. Technical Requirements: Direct injection technology has higher requirements, with the main technical challenge being the achievement of stratified combustion. While multi-point fuel injection improves upon the uneven mixture distribution issue of single-point injection, it does not enhance fuel atomization or air-fuel mixing.
Having repaired cars for over 20 years, I've seen all kinds of engine issues. The main difference between direct injection and multi-point fuel injection lies in the fuel delivery location: direct injection sprays fuel directly into the cylinder to mix with air for combustion, offering benefits like stronger power and better fuel efficiency, especially noticeable during high-speed acceleration. However, the downside is it's prone to carbon buildup and has higher maintenance costs, with a single cleaning costing several hundred yuan. Multi-point fuel injection, on the other hand, sprays fuel into the intake manifold where it mixes before entering the cylinder. It's simpler in structure, more stable, less prone to failures, and cheaper to maintain. I recommend younger car owners opt for direct injection for performance, while family cars are better off with multi-point fuel injection for hassle-free ownership. The difference in fuel consumption and responsiveness between the two isn't significant, but in the long run, multi-point fuel injection suits most people better with fewer issues and easier driving.
