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OwnerFrank Meier, Matthias Blei +2inventors
InventorsFrank Meier, Matthias Blei, Michael Pfeil, Michael Fey
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In a method and a device for monitoring the operability of an emission control system of an internal combustion engine, at least two catalytic converters are situated in succession in an exhaust duct. For tracking control, breakthrough detection for diagnosing the first catalytic converter, and for a second balancing for the storage capacity of oxygen or rich gas of the second catalytic converter, a two-point lambda probe be used and, for the latter, tolerance and aging effects are compensated. This results in particular in cost advantages in emission control systems for fulfilling stricter emission and diagnostic requirements.
A method for monitoring an operability of an emission control system of an internal combustion engine that, in its central section includes first and second catalytic converters situated in an exhaust duct in succession, a first lambda probe being situated, with respect to a direction of flow of exhaust gas, downstream of an engine block and upstream of the first catalytic converter, a first exhaust-gas probe being situated downstream of the first catalytic converter and upstream of the second catalytic converter, and a second exhaust-gas probe being situated downstream of the second catalytic converter, wherein the lambda probe is used to perform a lambda control and a balancing for a storage capacity of oxygen or rich gas of the first catalytic converter, and the second exhaust-gas probe is implemented as a first two-point lambda probe and is used to perform a catalytic converter diagnosis of the second catalytic converter, the method comprising:
An emission control system of an internal combustion engine, the emission control system comprising:
Dependencies are inferred from the claim text.