So, The need for emission control from automobiles gave rise to the computerisation of the automobile.
Hydrocarbons, carbon monoxide and oxides of nitrogen are created during the combustion process and are emitted into the atmosphere from the tailpipe.
There are also hydrocarbons emitted as a result of vaporisation of gasoline and from the crankcase of the automobile.
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The manufacturers answer was the addition of certain pollution control devices and the creation of a self adjusting engine. They were called feedback fuel control systems.
The computer is also capable of monitoring and diagnosing itself. The computer will at the same time record the fault in it’s memory, so that a technician can at a later date retrieve that fault in the form of a code which will help them determine the proper repair.