| 摘要 |
A humidity amplification system for an internal combustion engine 1 comprises a conduit 10, eg of heat resistant silicone plastics material, for conveying a portion of exhaust gas to a point 19 in an air intake 6 upstream of a throttle plate 24 forming part of the air intake. The conduit 10 may take exhaust gases from a collector 4 located between a catalytic converter 3 and a silencer 5 to a vaporising chamber 7 which is heated eg by thermal connection 8 to the exhaust manifold 2. In a diesel engine, a vacuum pump may be used to draw recycled exhaust gas through the conduit 10. The amount of exhaust gas to be recycled may be determined using a humidity sensor 29. In a modification, the exhaust collector 4 is located upstream of the catalytic converter 3 and an auxiliary catalytic converter (14, fig.3) is provided in the tube 10. An EGR tube (33, fig.4) may be provided between the exhaust and inlet manifolds so that the engine management system 22 can select humidity amplification, eg at high engine speeds, or EGR, eg at low engine speeds. |
