Motronic 1.3 engine management system. Free Technical Library article

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Motronic 1.3 engine management system

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

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The integrated engine management system consists of an "M1.3" fuel injection control subsystem and an "LE-Jetronic" based ignition control subsystem. The "Motronic 1.3" system includes an electric control unit (ECU), an electric fuel pump, a fuel pump relay, a fuel distributor, injectors, a fuel pressure regulator, an idle speed regulator, an air flow meter, a throttle position sensor, a coolant temperature sensor, a sensor engine speed, canister (activated carbon tank), ventilation valve, ignition coil, ignition distributor and spark plugs. The engine management system works as follows: the fuel pump delivers fuel through the fine filter to the fuel distributor. Further, fuel is supplied to the nozzles installed on the engine intake manifold, and through them to the combustion chambers (cylinders).

A fuel pressure regulator is installed on the fuel distributor, which is dependent on the vacuum in the intake tract and maintains the optimum fuel pressure in the system. Air is supplied through the air filter to the intake tract, at the beginning of which an air flow meter is installed. The air flow meter readings are taken into account by the ECU to optimize the quality of the fuel mixture. The body of the air flow meter may include an additional air channel with an air supply regulator bypassing the main air path. With this regulator, within a small range, you can adjust the level of CO in the exhaust gases. The throttle position sensor is the primary sensor used by the ECU to determine the quality of the fuel mixture. An additional air duct bypassing the throttle with an idle speed controller mounted on it serves to optimize engine idling. The idle speed controller is controlled by an electric control unit. Starting modes of the engine are regulated by the ECU according to the readings of the coolant temperature sensor. At the initial moment of starting a cold engine, a rich fuel mixture is injected.

The injection is made three times during the first three revolutions of the engine crankshaft. After starting the engine, fuel is injected once for every revolution of the engine crankshaft. The fuel tank is vented by means of a valve with adaptive control. From the fuel tank, fuel vapor through an adsorber (a container with activated carbon) and a valve are fed into the engine intake tract. The valve is controlled by an electric control unit and depends on the engine speed and load. When the control voltage is turned off, the valve can be opened under the action of vacuum in the engine intake tract. To prevent spontaneous ignition of fuel vapors after the ignition is switched off, the valve remains under control voltage (off) for a few more seconds. After that, the spring check valve closes and the access of fuel vapors to the engine intake tract stops. The ignition timing is regulated by the ECU on the signal from the engine crankshaft speed sensor and depending on the engine operating mode.

Structural diagram of the engine management system "Motronic 1.3"

Fig. 1

1. Adsorber
2. Fuel pump relay
3. Fuel tank
4.Ventilation valve
5. fuel pressure regulator
6. Fuel storage
7. Fuel filter
8. Fuel pump
9. Air flow meter
10. Injector
11. Air regulator
12. Idle speed regulator
13. Throttle sensor
14. Coolant temperature sensor
15. Spark plug
16. Electric control unit
17. Ignition coil
18. Ignition distributor
19. Crankshaft speed sensor

Publication: cxem.net

See other articles Section Automobile. Electronic fuel injection

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