Audi is betting on the electrification of its future cars to improve real-world economy and reduce exhaust pollution, company bosses have told Autocar.
The move will also allow the company to usher in some highly advanced suspension innovations as well as providing a degree of autonomy that goes beyond simple driving assistance.
This shift towards ‘mild hybrid’ systems and more conventional plug-in hybrids should also result in Audi’s future line-up moving away from diesel engines, particularly across the company’s smaller models, including the A1, A3 and A4.
Moving to petrol hybrid engines will also allow Audi to exploit its new ‘predictive efficiency assistant’ technology, which uses mapping information and live traffic reports to automatically switch between power sources, as well as taking advantage of downhill stretches of road to ‘coast’ the engine.
The key to Audi’s move is the adoption of Integrated Starter Generators (ISG). These are large electric motors that act as the starter motor and alternator but can also assist the engine by sending torque through the drive belt to the engine’s crankshaft. The system is also fitted with a small lithium ion battery.
Audi has developed an ISG that works on an ordinary 12V electrical system, so it could be fitted to today’s A1 and A3 models. The company says the system allows the stop-start system to cut in below 9mph and also allows the engine to coast at high speeds, both significant fuel saving measures. The first production version is expected in 2017.
Today’s A3 1.4 TSI Ultra has a claimed economy figure of 60mpg, but the 12V ISG system would push that up to 65mpg. However, the combination of coasting and energy recuperation under braking could see the real-world economy of the ISG-equipped engine rise even higher than the lab figures suggest.