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