| 摘要 |
<p>A catalytic converter for a diesel engine comprises a labyrinth made of metal foil (20, 22, 24). The foil is coated with an oxidation catalyst When exhaust gas (26) flows through the labyrinth, the gas is forced to make right-angle turns at intervals as short as about 5 mm. The number of right-angle turns can be as great as 30 turns per cubic centimeter of labyrinth. These abrupt turns cause particulates in the gas to be deposited on the foil (20, 22, 24). At intervals, fuel is injected into the exhaust gas. The fuel burns on the catalyzed surface and heats the converter sufficiently to burn the trapped particulates. In an alternative embodiment, there are two converters, and fuel is automatically injected into that converter which has more trapped particulates than the other, so as to burn the particulates trapped in that converter.</p> |
