Johnson Matthey Public Limited Company

Eive Tord Ronny Allansson

Martyn Vincent Twigg

Andrew Peter Walker

Claus Friedrich Goersmann

Anders Klas Andreasson

Mats Lavenius

An exhaust system for a vehicular lean-burn internal combustion engine includes a NOreduction catalyst, a source reductant, means () for contacting the catalyst with the reductant, means for sensing the temperature of the exhaust gas and/or the catalyst bed and means, when in use, for controlling reductant addition. The reductant addition control means supplies an amount of reductant to the catalyst at a rate corresponding to a measured temperature value of the exhaust gas and/or catalyst bed, which temperature value has been pre-determined to correlate, in use, with an amount of NOin the exhaust gas.

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Kungsbacka, Sweden

Eive Tord Ronny Allansson