During a cold start, the throttle control device increases the amount of intake air. From the coolant temperature sensor, the control unit receives information about the low temperature of the engine and calculates the long opening time of the valve injectors. If the temperature sensor reports that the coolant is warming up, then the idle speed stabilization is stopped, and the injection duration is reduced towards the normal duration. The duration of injection in normal mode in this case depends primarily on the position of the throttle valve and the data received by the air mass meter.
In idling mode, the control device changes the ignition timing if the speed falls below the permissible value. In addition, the throttle control device can increase the air flow rate and thus the amount of injected mixture.
If the driver accelerates hard when, for example, he wants to overtake, the control unit detects this by a sharp movement at the throttle position sensor. The duration of the injection is increased for a while. In order to develop full power with the accelerator pedal fully depressed, the engine needs even more fuel. The duration of injection at full load is controlled by the control unit in accordance with the signals from the throttle position sensor and the air mass meter. If the maximum speed is exceeded, the control device switches off the injectors.
In the opposite case, that is, when the gas is released, the nozzles remain in the fully closed position. However, the control unit only activates the so-called forced idle cut-off if the engine has warmed up to operating temperature and the speed reported by the sensor exceeds 1500 rpm. Shutdown saves fuel.
To prevent the car from stopping immediately after one of the sensors fails, or any sensor gives an incredible value, emergency movement functions are programmed. Depending on the defect, the driver may not even notice this, however, a drop in power or difficult starting is possible.
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