Method for metering a reducing agent into NO.sub.x -containing e

Details Method for metering a reducing agent into NO.sub.x -containing e Method for metering a reducing agent into NO.sub.x -containing e

1998-08-26

2000-09-19

Denion, Thomas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60286, 60303, 60295, 60285, F01N 300

Patent

active

061194484

ABSTRACT:
In a method for metering a reducing agent into a NO.sub.x containing exhaust gas of an internal combustion engine before the exhaust gas enters the catalytic convertor having at least NO.sub.x reducing activity, a minimal heat capacity, and a minimal storage capacity for a reducing agent, the engine-specific data for NO.sub.x concentration and exhaust gas volume are determined with a reference engine. The actual exhaust gas temperature of the internal combustion engine during operation is measured by a sensor. The reducing agent amount is calculated based on the engine-specific data and the actual exhaust gas temperature. Load-specific parameter changes of the internal combustion engine during operation are detected and a dynamic correction of the reducing agent amount based on the load-specific parameter changes is performed. The corrected reducing agent amount is then supplied into the exhaust gas stream. In a variation of the inventive method, the NO.sub.x concentration is determined during operation of the internal combustion engine based on data provided by a sensor arranged in the exhaust gas stream upstream of the catalytic convertor.

REFERENCES:
patent: 5643536 (1997-07-01), Schmelz
patent: 5665318 (1997-09-01), Rembold et al.
patent: 5709080 (1998-01-01), Arora et al.
patent: 5842341 (1998-12-01), Kibe
patent: 5950422 (1999-09-01), Dolling

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