| 摘要 |
Diagnostics method for a supercharged internal combustion engine equipped with a fixed-geometry turbocharger, comprising a compressor through which air admitted into the intake circuit of the engine passes and a turbine rotationally connected to the compressor by a common shaft and through which engine exhaust gases in the engine exhaust circuit pass, said engine being associated with: - a throttle body for varying the cross section of the passage for air admitted into the engine intake circuit; and a waste gate mounted in parallel with the turbine in the engine exhaust circuit in order to vary the proportion of engine exhaust gases that pass through the turbine, characterized in that it comprises: a step (100) of calculating a first integral with respect to time (I1) of a measurement of atmospheric pressure (Patm) during a calculation time (T); a step (200) of calculating an integral with respect to time (I2) of a measurement of the boost pressure (Psural) during said calculation time (T); a step (400) of calculating a second integral with respect to time (I3) of a measurement of atmospheric pressure (Patm) during said calculation time (T); a step (700) of calculating two diagnostics criteria (C1, C2) dependent on the first integral with respect to time (I1) of atmospheric pressure (Patm), on the integral with respect to time (I2) of the boost pressure (Psural) and on the second integral with respect to time (I3) of the atmospheric pressure (Patm); a step (800) of comparing the first diagnostics criterion (C1) with a first diagnostics threshold (S1) and of comparing the second diagnostics criterion (C2) with a second diagnostics threshold (S2); and a step (900) of diagnosing a fault when at least one of the diagnostics criteria (C1, C2) is below its associated diagnostics threshold (S1, S2). |
