| 摘要 |
<p>PURPOSE:To correct a value of the atmospheric condition and correct supercharge pressure, by calculating feedback air fuel ratio (air fuel ratio in an engine combustion chamber) on the basis of a feedback signal from an air fuel ratio sensor and correcting the ratio on the basis of a deviation of the feedback air fuel ratio from the basic air fuel ratio. CONSTITUTION:Conditions of idling (range A), low load (range B) and high load (range C) of an engine are detected, on the basis of a feedback signal from an air fuel ratio sensor 32, feedback air fuel ratio is calculated and a deviation of the feedback air fuel ratio from the basic air fuel ratio is calculated. If the deviation is at least a prescribed value in the three ranges A, B, C, the cause is decided due to change of a condition of the atmosphere, as the deviation becomes rich the opening of an exhaust relief valve 26 is decreased to increase rotary speed of a turbine 23 and supercharge pressure. As the deviation becomes lean, the opening of the valve 26 is increased to decrease the rotary speed of the turbine 23 and the supercharge pressure.</p> |
