Correction of the crankshaft speed at idle depending on the coolant temperature
Correction of the crankshaft speed at idle speed depending on the coolant temperature is shown in Figure 4.47.
Fig. 4.47. Dependence of the crankshaft speed at idle on the coolant temperature
Correction of the crankshaft speed at idle depending on the electrical load
Correction of the crankshaft rotation speed at idle speed compensates for the voltage drop when the power consumer is switched on at a low battery charging current. For this purpose, the crankshaft rotation speed at idle speed increases, as a result of which the generator rotation speed and, accordingly, the battery charging voltage increase.
The lower the voltage, the greater the idle speed correction. Thus, the idle speed correction value is variable. The engine idle speed correction is performed when the voltage decreases below 12 V. The engine idle speed can increase to a maximum of 900 min⁻¹.
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Correction of the idle speed in case of a faulty accelerator pedal position potentiometer. In case of a faulty accelerator pedal position potentiometer, the idle speed is maintained at 1200 min⁻¹.
If there is a discrepancy between the signals from the accelerator pedal position potentiometer and the sensor, the idle speed of the crankshaft increases to 1250 min⁻¹.