|The Concept Tiguan.|
At the Los Angeles Auto Show, Volkswagen introduced the new Concept Tiguan, a “small Touareg” that it will put on the market at the end of next year. The concept shown in Los Angeles is powered by a “Clean TDI”, a new diesel engine with reduced engine-out emissions combined with a BLUETEC-labeled NOx aftertreatment system.
The aftertreatment system uses a NOx storage catalytic converter and reduces emissions of oxides of nitrogen by up to 90% compared to engines known today.
A NOx-storage catalytic converter (lean NOx trap) is discontinuous—at λ >1, it stores NOx; at λ<1, it releases and reduces NOx. Additional fuel consumption may result from the catalytic converter regeneration.
(Urea SCR catalytic converter systems, by contrast, are continuous, with the hydrolysis and thermolysis of urea leading to the formation of NH3 which is in turn used by the SCR catalyst to reduce NOx.)
The Clean TDI introduced in the Concept Tiguan is also one of the first components of the BLUETEC offensive initiated jointly by Audi, Mercedes-Benz and Volkswagen. (Earlier post.)
Volkswagen says that it will provide more technical details on the Concept Tiguan in the first quarter of 2007.