Patent Document ID: 20070124183
Application ID: 11546653
Patent Flag: 0

Claim One:
1. A method for detecting anomalous behaviour of a common rail fuel supply system ( 40 ) of an internal combustion engine including a pressurised common rail fuel volume ( 4 ) arranged to receive fuel from a pumping arrangement ( 6 ) and to supply pressurised fuel to a plurality of fuel injectors ( 8 ), the method including: determining a system model including plurality of characteristic parameters to define a common rail pressure value in response to the amount of fuel pumped into the common rail ( 40 ); calculating one or more metrics indicative of the current system performance based on the plurality of characteristic parameters; comparing the one or more calculated metrics with one or more predetermined metrics indicative of anomalous system behaviour; and identifying a predetermined system fault condition if one or more of the derived metrics corresponds to one or more of the predetermined metrics.