What is the difference between direct injection and multi-point injection?

[ReeseAnn]

Differences between direct injection and multi-point injection: 1. Different fuel injection methods: Direct injection delivers fuel directly into the cylinder, where it mixes with air from the intake manifold before combustion; multi-point injection sprays fuel at the intake manifold, where it mixes with air before entering the cylinder for combustion. 2. Different technologies: Direct injection technology is less mature and more complex in structure; multi-point injection technology is mature and simpler in structure. Direct injection involves injecting fuel directly into the cylinder to mix with air, with advantages including lower fuel consumption, higher power output per liter, and a compression ratio as high as 12, improving power and torque by 10% compared to conventional engines of the same displacement. Multi-point injection refers to the process in gasoline engines where fuel is injected into the intake manifold, controlled by a specific timing sequence from the control program, and executed by electronic fuel injectors.