Control method and device for substances escaping from tanks in internal combustion engines

摘要

According to one embodiment of the invention the quantity of substance escaping is controlled according to the intake air quantity of an internal combustion engine. During normal operation of the engine an air-fuel ratio for the substance escaping is calculated according to a rate of escape and a value for the air-fuel feedback control. During non-steady engine operation a set point for the feedback control of the air-fuel ratio is calculated according to the rate of escape and the air-fuel ratio of the substance escaping. If the difference between the value of the feedback control for the air-fuel ratio and the set point for the feedback control for the air-fuel ratio exceeds a predetermined value, the value for the feedback control of the air-fuel ratio is corrected. An undesirable fluctuation of the air-fuel ratio of a fuel mixture fed to the cylinders, which occurs in the event of rapid fluctuations of the rate of escape, can be suppressed.