Smoke measuring apparatus.

摘要

An apparatus for providing an indication of the level of smoke in an engine exhaust includes a radiation sensor 12 which is mounted in a combustion chamber of the engine. The signal produced by the sensor during combustion of fuel is processed to produce a signal representing the period of combustion of fuel in the cylinder and this signal is applied to a map 18 which contains recorded data showing the relationship between the combustion period and the level of smoke. From the map the level of smoke can be obtained.