Method for monitoring the light-off performance of an exhaust gas catalytic converter system
AssigneeSiemens Aktiengesellschaft
InventorDietmar Ellmer
Life of this patent
Estimating the term…
Abstract
It is proposed that a quantity of heat input fed with the exhaust gas to the light-off area (8) during hot running up to a point in time be used as a criterion for successive conversion (light-off) in the downstream consecutive subvolumes (8a) of the light-off area (8) and that the functional capabilities of at least one of the downstream subvolumes (8a) heated consecutively be tested and evaluated individually at any moment of the light-off. The local variation of the catalytic converter efficiency can thus be monitored in the light-off area (8).
Claims10
A method for monitoring the light-off performance of a catalytic converter system in the exhaust gas duct of an internal combustion engine, comprising the steps of:
- feeding an air/fuel mixture to the catalytic converter system,
- evaluating the light-off performance on the basis of the conversion capacity in a light-off area of the exhaust gas catalytic converter system substantially influencing the emissions of the engine running hot,
- using a quantity of heat input fed with the exhaust gas to the light-off area during hot running up to a point in time as a criterion for successive conversion (light-off) in the downstream consecutive subvolumes of the light-off area, and
- individually testing and evaluating the functional capabilities of at least one of the downstream subvolumes heated consecutively at the respective moment of the light-off.
Dependencies are inferred from the claim text.