| 摘要 |
Disclosed is a method of operating a fuel injection system of an internal combustion engine, the injection system comprising a low pressure pump for supplying fuel to a high pressure pump via a fuel rail, such as a common rail, and a fuel injector for injecting fuel into a cylinder of the engine. The method comprises determining a nominal fuel quantity to be injected into the cylinder as a function of an engine operating point and determining a correction fuel quantity as a function of an index indicative of a high pressure pump efficiency and of an injector performance. The target quantity of fuel to be injected is determined by adding the values of the nominal fuel quantity and the correction quantity and the low pressure pump is controlled to supply the target fuel quantity to the high pressure pump. The high pressure pump efficiency may take in to account leakage in the system and the injector performance correction factor allows for corrections arising from the age of the injector and resulting deterioration and wear. An engine system, computer program for calculating the corrected fuel quantities and engine control unit using the program are also disclosed.
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