| 摘要 |
<p>PURPOSE:To aim at improvement in the exhaust purifying performance of an engine when it is at a low temperature by providing its exhaust system with a hydrogen adsorber, and then introducing hydrogen in the adsorber into the upper stream side from a catalyst when the exhaust gas temperature reaches a prescribed value. CONSTITUTION:In parallel to a catalyst equipment 2 for an exhaust pipe 3 is placed an adsorber 4 provided with a hydrogen adsorbent E. The adsorbent E adsorbs H2 in the exhaust gas at a temperature of less than about 100 deg.C, and removes H2 to discharge it at a temperature of not less than about 200 deg.C. On the adsorbent E and the catalyst equipment 2 are provided temperature sensors 16, 15 respectively, and detection signals from the sensors are inputted in a control unit 10. At first, when the adsorbent temperature is at not less than about 100 deg.C, changeover valves 5, 7 are changed so that the exhaust gas is caused to flow through passages 6, 8 into the adsorber 4, in which H2 is adsorbed. Subsequently, when the exhaust gas temperature is raised to not less than about 200 deg.C, the exhaust gas is caused to flow into the adsorber 4 in the same manner so that the stored H2 is removed to flow into the catalyst equipment 2. Thereby, the exhaust gas purifying performance at the time of low temperatures can be improved.</p> |
