| 摘要 |
PURPOSE:To calculate intake-air flow rate accurately and contrive to enhance accuracy of air-fuel ratio, by a method wherein the deviation of feedback air- fuel ratio is calculated on the basis of a feedback signal fed from an air-fuel ratio sensor, and the values stored in a memory part corresponding to the operating conditions of the engine are corrected on the basis of altitude and the intake-air flow rate. CONSTITUTION:Outputs from an air flow meter 2, a sensor 28 for intake-gas temperature, a sensor 30 for water temperature, the sensor 31 for air-fuel ratio and a battery 37 are fed to an analog-to-digital converter 60. The feedback air-fuel ratio is calculated on the basis of the feedback signal fed from the sensor 31, and the values stored in the memory part corresponding to idling, low- load, high-load and other operating conditions of the engine are corrected on the basis of the deviation of the feedback air-fuel ratio from a reference air- fuel ratio. A correction value for an output of the air flow meter 2 is corrected according to the corrected values in the memory part, and further, it is corrected on the basis of an altitude compensation value, whereby the intake-air flow rate can be calculated accurately. |
