| 摘要 |
PURPOSE:To enable to perform an appropriate introducing control of secondary air by means of a common control valve, by performing a mean detection of exhaust gas from an exhaust pipe at each side with the aid of a common exhaust gas sensor located in a connecting path. CONSTITUTION:Two each secondary air introducing pipes 13 at one side and the other side are respectively joined together and joined each other at a lead valve part 14 to form a common pipe, which is open to the inside of an air cleaner 16 at an upstream end of each suction pipe through a control valve 15 on the upstream side. Further, exhaust pipes 9 at each side, joining together at respective joining part 10, are open to the inside of a connecting path 17 in the upstream thereof connected to a muffler 11 at each side in a manner that the both openings are positioned facing to each other and in a stagger. An exhaust gas sensor 18 is located therebetween, and the output signal of the sensor 18 is fed to a control valve 15 through a control circuit 19. |
