IDLE RPM CONTROL METHOD OF VEHICLE ENGINE

摘要

The present invention relates to an idle speed control method applied to an automobile engine having an electronically controlled fuel injection function, comprising: a first step of sensing a temperature of a coolant through a water temperature sensor; A second step of applying the mapped idle rotation speed to the engine from the temperature of the coolant detected in the first step; A third step of integrating the idle rotation speed change amount for a predetermined time after waiting a predetermined time; A fourth step of determining whether the integrated value calculated in the third step is smaller than the reference value T1; A fifth step of adding a predetermined number of times to the current idle rotation speed when the integral value is smaller than the reference value T1 in the fourth step; A sixth step of subtracting a predetermined number of times of the idle speed when the integral value is larger than the reference value T1 in the fourth step; It is determined whether the idle rotational speed obtained as a result of the fifth step or the sixth step is smaller than the target rotational speed N1, and if the idle rotational speed obtained is smaller than the target rotational speed, the operation is completed; It consists of a seventh step to jump to the step to perform the operation after the third step, integrating the change amount of the engine speed during the idle control and compare the integral value with a predetermined reference value, the engine speed is constant according to the comparison result By reducing or increasing the number of times, fluctuations in the engine speed can be eliminated, and stable engine operation can be achieved by removing the fluctuations in the engine speed.