Engine warm-up phase: The temperature sensor reports the rising coolant temperature to the control unit. He gives the order to close the idle stabilization valve, the duration of the fuel supply by the injectors is reduced to normal.
Idling: From the messages of the throttle potentiometer and the potentiometer on the air mass meter, the control unit recognizes when the engine is idling. If the idle speed drops, the control unit changes the ignition timing; at the same time, the idle speed stabilization valve opens its air channel, thereby increasing the amount of injected fuel.
Normal operation does not require any special equipment. The duration of the opening of the injection nozzles is determined by the position of the throttle valve and the valve shutter in the air mass meter.
Acceleration: Rapid opening of the throttle valve is recognized by the control unit as acceleration from the throttle valve potentiometer. Accordingly, the injection duration is shortly increased.
Lambda control: The catalytic converter requires a constant change of rich or lean mixture to function flawlessly. Residual oxygen content at a given time lambda probe (located in the catalytic converter) transmits to the control unit, which in a fraction of a second orders the injection nozzles for a shorter or longer injection time and, therefore, the amount of fuel.
Stopping the fuel supply in forced idle mode: the information about the removal of the foot from the accelerator pedal again passes through the throttle valve potentiometer to the control unit. If at the same time the coolant temperature sensor reports that the engine has reached its operating temperature, and the Hall sensor in the distributor reports that the engine speed is more than 1500 rpm, then the control unit does not give an order to open the injection nozzles.
Full load: The engine needs more fuel to develop full power when the accelerator pedal is fully depressed. Message Based «full throttle» from the throttle potentiometer in combination with the fully open valve shutter, the control unit recognizes the status «full load» and increases the injection duration of the injectors, while the signal of the lambda probe is ignored.
Speed limitation: to protect against exceeding the maximum permissible engine speed, the control unit turns off the injection nozzles if the Hall sensor reports a speed of 6400-6500 rpm.
Operation in an emergency: if the signal from one of the information providers does not come at all or has a meaningless indicator, then the Digifant injection system does not get out of normal operation even in these conditions. The control unit selects a so-called spare indicator already stored in memory. He, of course, cannot take into account many operating conditions, but the car still remains on the move. The driver can recognize the absence of a signal from the sensor by insufficient power or poor starting properties.
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