The classification of fuel injection system of gasoline engine is based on the injection position of injector.

The fuel injection system of gasoline engine can be divided into intake pipe injection system and in-cylinder injection system according to the different injector components. Among them, intake pipe injection can be divided into single-point injection (SPI, TBI or CFI) and multi-point injection (MPI), and multi-point injection can be divided into pressure-type (D-type) and flow-type (L-type) multi-point injection systems.

For the intake pipe injection system, it can be divided into single-point injection system and multi-point injection system according to the different installation parts of the injector. Singlepoint fuel injection system (SPFI or SPI), also known as throttle body injection or centralized injection system, refers to a fuel injection system in which one or two injectors are installed above the throttle of the throttle body (throttle body) of a multi-cylinder engine.

Precautions:

(1) "Vehicle" refers to motor vehicles and non-motor vehicles.

(2) "Motor vehicle" refers to a wheeled vehicle that is driven or towed by a power plant and travels on the road for people to ride or transport articles and carry out special engineering operations.

(3) "Non-motor vehicles" refer to vehicles driven by human or animal power and running on roads, as well as disabled motorized wheelchairs, electric bicycles and other vehicles whose design maximum speed, no-load weight and overall dimensions meet the relevant national standards.