Mitsubishi MPI injection system. Free Technical Library article

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Mitsubishi MPI injection system

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Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic fuel injection

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This control system is a multi-point injection system and may include: fuel pump, atmospheric pressure sensor, air flow sensor, throttle position sensor, position motor position sensor, X.X. switch sensor, air flow temperature sensor, fuel pressure regulator, injectors , a knock sensor, a coolant temperature sensor, a TDC sensor of the first cylinder, a crankshaft angle sensor and an oxygen content sensor in exhaust gases (lambda probe), an electrical control unit (ECU) and an error indicator lamp. The principle of operation of the MPI system is based on the control of all elements from the electric control unit, which corrects the operation of the injection depending on the readings of the sensors installed on the engine. Fuel through the fuel filter is supplied by the fuel electric pump to the distribution line (fuel accumulator or fuel accumulator), and through it directly to the injectors (nozzles). The pressure in the fuel path is maintained by a pressure regulator (check valve), which maintains the optimum pressure in direct proportion to the vacuum in the intake manifold.

The amount of fuel injected into the engine intake manifold depends on the injector opening time, which is determined by the ECU depending on the signals it receives from the system's sensors. The injector is a solenoid needle valve and is controlled directly by the Electronic Unit (ECU). The air necessary for preparing the fuel mixture is supplied to the system through an air filter, in the housing of which an intake air temperature sensor and an air flow meter are installed. The air flow meter gives the ECU information about the amount of air entering the system. The throttle position sensor connected to the gas pedal provides information to the ECU, which takes it into account when controlling the system. In addition, an X.X. regulator is installed in the throttle body. (installation motor) with its position sensor. To keep the exhaust clean, the system uses feedback through an exhaust oxygen sensor (lambda probe), which is mounted on the exhaust manifold. To indicate errors in the operation of the injection system, a lamp "CHECK ENGINE" is installed on the dashboard. If there are errors in the system, it is possible to read error codes from the ECU memory by initializing self-diagnosis, which can be done through the diagnostic connector.

Structural diagram of the fuel injection control system "Mitsubishi MPI"

1. electric control box
2. air flow temperature sensor
3. airflow meter
4. throttle sensor
5. H.H. switch sensor
6. idle speed controller
7. intake manifold
8. fuel storage
9. fuel pressure regulator
10. fuel fine filter
11. injector of the 1st cylinder
12. injector of the 2st cylinder
13. injector of the 3st cylinder
14. injector of the 4st cylinder
15. ignition distributor
15a. TDC sensor of the 1st cylinder
15th century crankshaft position sensor
16. engine
17.knock sensor
18. temperature sensor O.Zh.
19. lambda probe
20. fuel tank
21. fuel filter
22. fuel pump

Publication: cxem.net

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