TDI engine technology made its debut in 1989. Audi presented the world’s first production car diesel engine with turbo charging, direct injection and electronic management at the Frankfurt Motor Show (IAA). Turbodiesel technology with direct injection went on to become a major success.
Today, Audi TDI engines featuring the latest common rail injection technology are as notable for their power and refinement as they are for their exceptional economy. Their great advantage is plentiful torque that is available from low revs, making for strong and easily accessible performance, coupled of course with remarkable cruising range. This choice blend continues to make TDI variants the most popular in every Audi model range that offers this option.
In TDI engines equipped with the common rail system, all cylinders are located on a single high-pressure rail. This rail is an accumulator, which is supplied by a pump and stores the fuel at a pressure of up to 2,000 bar – the equivalent of the weight of a luxury saloon car on the space of one square centimetre.
Thanks to the high pressure and a very fine bore diameter of only one tenth of a millimetre in the nozzle, the injectors achieve very fine atomisation of the fuel. This ensures excellent mixture preparation and highly efficient combustion, which delivers greater power, low emissions and low fuel consumption.
Article source: www.audi.co.uk