Audi used the Frankfurt Motor Show to showcase the world’s cleanest diesel engine technology which is already in service in Ireland latest generation Q7 models. This new clean diesel technology helps to rid the air of Nitrogen Oxide (NOx) emissions, regarded by many as being dramatically more harmful to humans than Carbon Dioxide (CO2).

Capable of removing up to 90 per cent of NOx particles from exhaust gases, this ultra-low emission technology was a highlight at the 2009 Frankfurt Motor Show, where it was showcased in the compact executive A4 Saloon.

The Q7 3.0 TDI Clean Diesel is the first passenger car to be available in the Ireland with this advanced system, which has been designed to maximise engine efficiency and to optimise the after-treatment of exhaust gas. With its help, the 3.0-litre TDI engine powering the Q7, and showcased in the A4 in Frankfurt, already complies with proposed EU6 emissions limits that are not due to come into force in Europe until 2014. The core components of this ultra-low-emission system are a new common-rail injection system, new pressure sensors in the combustion chamber and a high-performance exhaust recirculating system. Collectively these measures ensure a highly efficient and low-emission combustion process.

In addition, an innovative DeNOX catalytic converter, or ‘NOx trap’, integrated within the exhaust system reduces residual nitrogen oxides. Upstream of it a pump injects an aqueous solution called AdBlue into the hot exhaust flow, where it decomposes into ammonia. The ammonia then has the effect of splitting the nitrogen oxides into the inert gas nitrogen and into water.

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