| 摘要 |
A vehicle internal combustion engine exhaust system featuring two different exhaust routes to which the exhaust gas is directed selectively by an on-off device; the system also comprising a device for comparing parameters, consisting in engine speed, the opening angle of the throttle, and the vacuum inside the intake manifold and/or engine load, with respective predetermined values, for opening the on-off device upon the above parameters reaching the aforementioned predetermined values, and so selectively enabling the exhaust gas to flow along both the exhaust routes. |
