| 摘要 |
There is described a method of diagnosing leakage in a common-rail injection system of an internal combustion engine having a number of cylinders; the injection system having a number of injectors, each supplying high-pressure fuel to a respective cylinder of the engine, and a fuel supply circuit supplying fuel to the injectors. The diagnosis method includes the steps of determining the contribution of each cylinder to the angular acceleration of the engine; determining, for each cylinder, an unbalance index indicating the unbalance of the angular acceleration contribution of the cylinder with respect to the angular acceleration contributions of the other cylinders; reducing, upon detection of a fault in the injection system, the amount of fuel injected into each cylinder; and distinguishing, for each injector, between a jammed-open injector condition and a fault condition in the fuel supply circuit, on the basis of the variation in the unbalance index of the respective cylinder following the fuel reduction.
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