초록 ▼

A diagnostics method and system for a power plant including at least one low-pressure turbocompressor and at least one high-pressure turbocompressor, the turbocompressors being staged and supplying an internal combustion engine, the power plant being fitted to a motor vehicle. The method includes de

A diagnostics method and system for a power plant including at least one low-pressure turbocompressor and at least one high-pressure turbocompressor, the turbocompressors being staged and supplying an internal combustion engine, the power plant being fitted to a motor vehicle. The method includes determining a mode of operation of the power plant, determining a power of the high-pressure turbine based on a first set of data and based on the mode of operation, determining the power of the high-pressure turbine based on a second set of data, determining a failure criterion as being the ratio between the power of the high-pressure turbine dependent on the first set of data and the power of the high-pressure turbine dependent on the second set of data, and comparing the failure criterion against stored values to determine whether there is a failure.

대표청구항 ▼

1. A diagnostic method for a power train including at least one low-pressure turbocharger and at least one high-pressure turbocharger, the high-pressure turbocharger including a high-pressure turbine and a high-pressure compressor, the turbochargers being staged and supplying an internal combustion

1. A diagnostic method for a power train including at least one low-pressure turbocharger and at least one high-pressure turbocharger, the high-pressure turbocharger including a high-pressure turbine and a high-pressure compressor, the turbochargers being staged and supplying an internal combustion engine, the power train being installed in an engine vehicle, the method comprising: determining a mode of operation of the power train as a function of a position of a high-pressure bypass and of pressure upstream of the high-pressure turbine, the high-pressure bypass being connected between an inlet and an outlet of the high-pressure turbine;determining a power of the high-pressure turbine as a function of a first set of data and as a function of the mode of operation;determining a power of the high-pressure turbine as a function of a second set of data;determining a failure criterion as a ratio between the power of the high-pressure turbine that is a function of the first set of data and the power of the high-pressure turbine that is a function of the second set of data; andcomparing the failure criterion to stored values to determine whether a failure exists. 2. The diagnostic method as claimed in claim 1, wherein the first set of data is determined on a side of the high-pressure turbine. 3. The diagnostic method as claimed in claim 1, wherein the first set of data includes a speed of rotation of the high-pressure turbine and a temperature upstream of the high-pressure turbine. 4. The diagnostic method as claimed in claim 1, wherein the first set of data includes pressure upstream of the high-pressure turbine and a temperature upstream of the high-pressure turbine. 5. The diagnostic method as claimed in claim 1, wherein the first set of data includes a position of the high-pressure bypass, a temperature upstream of the high-pressure turbine, and a speed of rotation of the high-pressure compressor. 6. The diagnostic method as claimed in claim 1, wherein the second set of data is determined on a side of the high-pressure compressor. 7. The diagnostic method as claimed in claim 1, wherein the second set of data includes a speed of rotation of the high-pressure compressor, a supercharging pressure, and a speed of rotation of the internal combustion engine. 8. A diagnostic system for a power train including at least one low-pressure turbocharger and at least one high-pressure turbocharger, the high-pressure turbocharger including a high-pressure turbine and a high-pressure compressor, the turbochargers being staged, and supplying an internal combustion engine, the power train being installed in an engine vehicle, the diagnostic system comprising: means for determining a mode of operation of the power train as a function of a position of a high-pressure bypass and of pressure upstream of the high-pressure turbine, the high-pressure bypass being connected between an inlet and an outlet of the high-pressure turbinea first means for estimating power of the high-pressure turbine, the first means being linked to an output of the means for determining the mode of operation of the power train;a second means for estimating the power of the high-pressure turbine; andmeans for estimating a failure criterion connected at an input to the first means for estimating the power of the high-pressure turbine and to the second means for estimating the power of the high-pressure turbine and at an output to a comparison means configured to compare the failure criterion to stored values. 9. The diagnostic system as claimed in claim 8, wherein the first means for estimating the power of the high-pressure turbine includes at least one means for modeling the high-pressure turbocharger, and the means for modeling is configured to choose a model for estimating the power of the high-pressure turbine based on a signal received from the means for determining the mode of operation of the power train. 10. The diagnostic system as claimed in claim 8, wherein the first means for estimating power of the high-pressure turbine is configured to determining the power of the high-pressure turbine as a function of a first set of data and as a function of the mode of operation, and the first set of data includes a position of the high-pressure bypass, a temperature upstream of the high-pressure turbine, and a speed of rotation of the high-pressure compressor.