also: くうねんぴ
noun
air-fuel ratio; AFR
Technical term used in automotive and combustion engineering.
エンジンの性能を最適化するには、空燃比を正確に制御する必要がある。
To optimize engine performance, the air-fuel ratio must be precisely controlled.
Compound of 空 (air), 燃 (combustion), and 比 (ratio).