| 摘要 |
<p>PURPOSE:To enable the efficient recovery of unburnt HC by providing an exhaust gas condenser which condenses and removes said unburnt HC in exhaust gas by means of cooling water in an exhaust bypass which is branched off of an exhaust passage, and introducing the unburnt HC ingredient into an intake passage after warming up an engine. CONSTITUTION:An exhaust bypass 5 is branched off of an exhaust passage 2 on the lower course side of a catalyst converter 3, and a selector valve 14 which is switched so as to open a bypass 5 side when the catalyst converter 3 is judged in an inactive condition under a low intake temp., is provided in its branched part 5a. And, an exhaust gas condenser 30 through which a cooling water pipe 31 for an engine cooling water passes is provided midway in the exhaust bypass 5, to condense and remove the unburnt HC ingredient in exhaust gas by cooling the exhaust gas by means of the cooling water. And, after warming up an engine, the liquid type unburnt HC collected in a condensed ingredient reservoir 30b is mixed with air introduced from a vent hole 7 through a check valve 8 and, then, fed into an intake passage 19 on the upper course side of a throttle valve 23 through a passage 33.</p> |
