Warm-up phase: the temperature sensor reports the gradual warming of the coolant to the control unit by means of changing resistance values.
Idling: The idle signal switch informs the control unit of this operating mode. The throttle position control regulates the idle speed and balances the reduction in speed that occurs due to the inclusion of powerful current consumers, fully turned to one side of the power steering, the included working position of the automatic transmission or the included air conditioner.
Normal operation: the control unit receives information about the operation of the engine through speed pulses and resistance values \u200b\u200bfrom the throttle valve potentiometer (throttle position). From this, the control unit draws conclusions about the state of the load on the engine and measures the required amount of fuel to the incoming air through the injection nozzle.
Lambda control: when metering fuel, the fuel/air ratio 1=1 is taken into account. The constant change between rich and lean mixture enables optimal performance of the catalytic converter.
Acceleration: thanks to the signals from the potentiometer, the control unit recognizes a sharp press on the accelerator pedal as an acceleration process, as a result of which the mixture immediately «enriched». Full load: in full position «gas» or the control unit ensures the enrichment of the combustible mixture in full load mode. Therefore, proportionally more fuel is present in the mixture. The potentiometer informs about the position of the throttle valve. However, when the fuel mixture is enriched in full load mode, the lambda probe signal is ignored.
Forced idle mode (coasting): Mono-Motronic injection system saves fuel and cuts off fuel supply as soon as the engine has reached operating temperature. The control unit recognizes this operating state by the released pedal «gas» (throttle potentiometer), messages from the coolant temperature sensor and engine speed over 1500-1900 rpm.
Engine speed limitation: if the maximum engine speed is exceeded, the control unit cuts off fuel supply. unburned fuel will enter the catalytic converter.
The injection nozzle is shown here (2) with plug still connected (1), taken from nest (3) combustible mixture preparation unit. The fuel strainer is visible on the side of the valve.
Broken pressure regulator. The numbers indicate: 1 - cover; 2 - spring; 3 - membrane; 4 - supporting surface.
Operation in emergency situations: if the signal from one of the information providers does not come at all or has a meaningless value, the Mono-Motronic injection system still continues to work normally. The control unit has at its disposal so-called spare indicators already stored in memory. Such a reserve indicator, of course, cannot take into account many operating conditions, but the car still remains mobile. The driver can recognize the absence of a signal from the sensor by insufficient power or poor starting properties.
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