Engelhard Corporation

Other

Karl Richard Grimston

Joseph Allan Patchett

Gary Wayne Rice

John Lawrence Calabrese

Rudolfus Petrus Verbeek

Ramesh M Kakwani

Kenneth C Voss

Mathijs Van Genderen

Mathus Van Genderen

A diesel powered vehicle is provided with an SCR system which uses an external reducing reagent to convert NOx emissions in a manner which accounts for the effects of NOx transient emissions on the reducing catalyst. Actual NOx emissions produced by the engine are filtered using a variable NOx time constant in turn correlated to the reductant/NOx storage capacity of the reducing catalyst at its current temperature to account for changes in the SCR system attributed to NOx transient emissions. Catalyst temperature is filtered using a variable catalyst time constant corresponding to current space velocity of the exhaust gas to account for changes in the catalyst temperature attributed to NOx transient emissions. The reductant is metered on the basis of the filtered, corrected NOx concentration applied at a NSR ratio based, in turn, on the filtered, corrected reducing catalyst temperature.

Control system for mobile NOx SCR applications

A diesel engine aftertreatment exhaust system uses catalyzed soot filters for particulate matter reduction and urea SCR catalysts for NOx reduction on diesel engines in a combined system to lower particulate matter and NOx at the same time. With this integral emission control system, diesel engines are able to meet ultra low emission standards.

Exhaust system for enhanced reduction of nitrogen oxides and particulates from diesel engines

Growing community of inventors

Upper Strensham, United Kingdom

Karl Richard Grimston