| 摘要 |
An exhaust pipe 1 of an internal combustion engine is connected by branch duct 4 to a filter (2) dowstream of which is exhaust gas sensor 3, the discharge which is either returned to the engine through intake duct 10 or returned to the main exhaust stream. Sensor 3 has heating means 9 contained in common housing 8 and the condensate outlet of the filter may include throttle 7 to obtain the required flow characteristic for sensor 3. Pump 12 may be provided to assist the flow of exhaust gas and pressure peak responsive valves (13, 14, 15) may be provided to control the flow of exhaust gases from and into the main exhaust stream. <IMAGE> |
