Method of diagnosing the presence of an exhaust after-treatment component and a use of the method for vehicle on-board diagnosis
AssigneeVolvo Lastvagnar AB
InventorCharlotte Holmen
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Abstract
In a method for diagnosing the presence of an internal combustion engine exhaust aftertreatment component on a vehicle, the exhaust temperature is measured downstream the aftertreatment component continuously over a time period to provide a first temperature signal with fluctuating amplitude. The temperature signal is modified to provide a second modified temperature signal. The first and second temperature signals are compared to detect any significant difference between the signals.
Claims11
A method of diagnosing the presence of an internal combustion engine exhaust aftertreatment component on a vehicle using a single temperature signal source, wherein the aftertreatment component component comprises a thermic mass, comprising
- measuring the exhaust temperature downstream of the aftertreatment component continuously over a time period to provide a first temperature signal with fluctuating amplitude,
- modifying the temperature signal to provide a second modified temperature signal using a temperature signal analysis based on signal frequency or signal derivative, and
- comparing the first temperature signal and the second modified temperature signal to determine whether there is a difference between the signals.
Dependencies are inferred from the claim text.