Diagnostic method and device for diagnosing an intake system of an internal combustion engine
First Claim
1. A diagnostic method for performing diagnostics on the intake tract of an internal combustion engine with exhaust gas turbocharger comprising a compressor disposed in the intake tract and a turbine disposed in an exhaust tract of the internal combustion engine for the purpose of driving said compressor, the method comprising the steps of:
- determining a boost pressure of the compressor in a predefined operating state of the internal combustion engine,comparing the determined boost pressure to a predefined base boost pressure in the predefined operating state, anddetecting a leak in the intake tract downstream of the compressor in response to determining that the determined boost pressure is less than the predefined base boost pressure in the predefined operating state.
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Accused Products
Abstract
An internal combustion engine has an intake system (1) and an exhaust gas system (4). An exhaust turbocharger of the internal combustion engine has a compressor (42) arranged in the intake system (1) and a turbine (48) arranged in the exhaust gas system (4) of the internal combustion engine for driving the compressor (42). In order to diagnose the intake system (1), a charge pressure (PHS_AIC_DOWN) of the compressor (42) is determined in a predetermined operating state of the internal combustion engine. A leakage of the intake system (1) downstream of the compressor (42) is recognized if the determined charge pressure (PHS_AIC_DOWN) is lower than the predetermined base charge pressure (PUT_BAS) in the predetermined operating state.
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Citations
12 Claims
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1. A diagnostic method for performing diagnostics on the intake tract of an internal combustion engine with exhaust gas turbocharger comprising a compressor disposed in the intake tract and a turbine disposed in an exhaust tract of the internal combustion engine for the purpose of driving said compressor, the method comprising the steps of:
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determining a boost pressure of the compressor in a predefined operating state of the internal combustion engine, comparing the determined boost pressure to a predefined base boost pressure in the predefined operating state, and detecting a leak in the intake tract downstream of the compressor in response to determining that the determined boost pressure is less than the predefined base boost pressure in the predefined operating state. - View Dependent Claims (2, 3, 4)
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5. A device for performing diagnostics on the intake tract of an internal combustion engine with exhaust gas turbocharger comprising a compressor disposed in the intake tract and a turbine disposed in an exhaust tract of the internal combustion engine for the purpose of driving said compressor,
wherein the device is operable: -
to determine a boost pressure of the compressor in a predefined operating state of the internal combustion engine, and to compare the determined boost pressure to a predefined base boost pressure in the predefined operating state, and to detect a leak in the intake tract downstream of the compressor in response to determining that the determined boost pressure is less than the predefined base boost pressure in the predefined operating state. - View Dependent Claims (6, 7, 8)
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9. A device for performing diagnostics on the intake tract of an internal combustion engine with exhaust gas turbocharger comprising a compressor disposed in the intake tract, a turbine disposed in an exhaust tract of the internal combustion engine for the purpose of driving said compressor, and a pressure sensor determining a boost pressure of the compressor in a predefined operating state of the internal combustion engine,
wherein the device is operable to: -
comparing the boost pressure determined by the pressure sensor to a predefined base boost pressure in the predefined operating state, and detect a leak in the intake tract downstream of the compressor in response to determining that the boost pressure determined by the pressure sensor is less than the predefined base boost pressure in the predefined operating state. - View Dependent Claims (10, 11, 12)
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Specification