Importance

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Abstract

A diagnostic unit for determining the operational status of a fuel delivery system of an engine, the engine comprising a plurality of cylinders, each one of the cylinders comprising a combustion chamber into which fuel is injected by an associated fuel injector and within which, in use, combustion events repeatedly occur to define a combustion cycle of the cylinder between successive combustion events, the diagnostic unit comprising: inputs for receiving data related to engine rotation; processing means arranged: (i) to determine, from the data received at the inputs, a first engine rotation parameter for a cylinder under test at a first point within the combustion cycle of the cylinder and to determine a second engine rotation parameter for the cylinder under test at a second, different point within the combustion cycle of the cylinder; and (ii) to compare the two engine rotation parameters for the test cylinder in order to identify the operational status of the fuel delivery system associated with the cylinder under test.

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First Claim