What does multi-point fuel injection in an engine mean?
2 Answers
Multi-point fuel injection in an engine involves installing fuel injectors in the intake manifold corresponding to each cylinder. These injectors are controlled by the ECU, replacing the traditional carburetor used in gasoline engines to mix air and fuel for combustion. The injectors are positioned near the valves, which helps deliver a well-mixed air-fuel mixture directly into the combustion chamber, resulting in higher combustion efficiency. Multi-point fuel injection was developed in contrast to single-point fuel injection. Traditional gasoline engines use a carburetor in the intake manifold to form a fuel-air mixture that enters the cylinders, where it is ignited by the spark plug during the compression stroke. Single-point fuel injection replaces the carburetor with an electronic injector in the intake manifold to mix fuel and air.
Multi-point fuel injection, simply put, means that each cylinder of the engine has a dedicated fuel injector that sprays fuel into its respective intake port, unlike the old-fashioned single injector handling everything. This design allows for more precise fuel distribution, with the computer automatically adjusting fuel quantity based on data like RPM and temperature. The benefits are numerous: it improves fuel efficiency, saving about 5-10% on gas; emissions are cleaner, meeting environmental standards; and it makes the engine output smoother and more powerful, delivering a strong sense of acceleration when driving. I've seen many car models use it, such as everyday family cars. Compared to the old single-point injection, multi-point systems are less prone to uneven fuel supply issues. The downside is that there are more components, which can cost a bit more during repairs, but as long as you replace the air and fuel filters on schedule, breakdowns are rare. Overall, this is the mainstream technology for modern gasoline engines, ensuring cars are both economical and reliable.
