| 摘要 |
PURPOSE:To prevent the variation of air-fuel ratios among cylinders and improve the exhaust gas purification and the economical efficiency of fuel. CONSTITUTION:An oxygen sensor 22 is fitted to a place where the exhaust gas of each cylinder discharged in discharge pipes 19 from cylinders 17 through discharge ports 18 is collected. Catalyst converters 20, 21 are fitted downstream the sensor 22. The signal of the sensor 22 controls the fuel flow quantity or the suction air quantity and controls the air-fuel ratio by closed-loop feedback. Accordingly, the variation of air-fuel ratios among cylinders can be prevented and the exhaust gas purification and the economical efficiency of fuel can be improved. |
