Abstract The Audi 2.5 TDI in the Audi 100 marked the start of development of today’s direct injection diesel engines. The injection system has been and continues to be one of the key technologies for successful further development. The first TDI engines with CP37 and CP44 distributor-type fuel injection pump, for example, had attached pilot injection. 1999 saw the introduction of the first common rail injection system, which provided enough flexibility in terms of timing and number of injections that it was possible to optimise untreated emissions, acoustics and fuel consumption and to use modern exhaust aftertreatment technologies, from DPF to NOC and SCR. The system pressure was increased from a starting point of 1350 bar to 2500 bar for high-performance engines. Today, V TDI engines are used in derivatives from the Audi A4 to the Audi Q7. The Audi Q7 3.0 TDI e-tron quattro in 2015 became the world’s first plug-in hybrid with a six-cylinder diesel and quattro drive with fuel consumption of just 1.7 litres per 100 km or 50 grams of CO2 per kilometre in series production. The Audi SQ7 4.0 TDI quattro with V8 TDI engine delivering 320 kW power and 900 Nm torque followed in 2016. Model highlights include parallel charging, an electrically driven auxiliary compressor, variable valve control, a 2500 bar piezo-injection system and a combined exhaust aftertreatment system with NOC and SCR@DPF. Consistent evolutionary development makes the TDI drive train highly attractive in the future as well thanks to high road performance, range and eco-friendliness.
TDI: Yesterday – today – tomorrow
2017-01-01
15 pages
Article/Chapter (Book)
Electronic Resource
English
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