| 摘要 |
An exhaust system for an internal combustion includes an exhaust gas after-treatment device such as a catalytic converter (26) or a gas storage trap (28), and means for cooling the exhaust gases upstream of the after-treatment device. The cooling means include a turbine-blower (20, 30) comprising a turbine (20) driven by the exhaust gases from the engine and a blower (30) driven by the turbine (20) and connected by auxiliary pipes (32, 38) to draw gases from and return gases to a section (22) of the exhaust system downstream of the turbine (20). Recirculation of exhaust gases by the blower (30) through the auxiliary pipes (32, 38) and the section (22) of the exhaust system serves to cool the exhaust gases by heat loss through the walls of the auxiliary pipes (32, 38).
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