According to the number of injectors, the electronically controlled fuel injection system of the engine can be divided into two ways.

It is divided into two ways: multipoint injection and single point injection.

First, according to the injection position

1, in-cylinder injection-lean burn gasoline engine

2. Inlet injection

A: Spray before the intake valve-only applicable to MPI.

B: Spray above the throttle-only for SPI.

Second, according to the fuel injection mode

1, simultaneous fuel injection-each cylinder injector injects fuel simultaneously.

2. Group fuel injection-the fuel injectors of each cylinder are divided into several groups, and each group injects fuel alternately.

3. Sequential injection-injection is carried out according to the working order of the engine.

Third, according to the method of air flow measurement

1, mass flow type

2. Velocity density type

3. Throttle speed type

Extended data:

1, the basic composition of electronically controlled gasoline injection system

The electronically controlled gasoline injection system consists of four systems: air intake system, fuel injection system, ignition system and control system.

2. The basic working principle of electronically controlled gasoline injection system.

Various sensors input the detected engine air intake, speed, crankshaft angle, throttle opening and engine temperature into the ECU, and the ECU will process, calculate, compare, analyze and judge the signals.

Send control instructions to the executive parts to make the engine fuel injection and ignition system work in the best or set range.

Reference source: Baidu Encyclopedia: electronically controlled fuel injection system