2015 Audi Q7 will feature e-boost technology from Audi. 2015 Q7 will be the world’s first car to feature electric turbocharger. The German brand has recently previewed the new technology in a RS5 TDI concept. Audi’s head of diesel-engine development, Ulrich Weiss said,
“I can confirm we are working on the development of the e-boost definitely. Be sure that Audi will bring it to the market. Maybe it will be not this year. But it will be very soon.”
Audi is working on electric boost technology. The technology features electric turbo for improving launch behavior and transient response of its diesel engines. Unlike a regular turbocharger, electric turbocharger provides maximum boost almost immediately after the driver’s demand for engine torque. Connecting a small electric booster in series with a larger turbo can deliver better performance than single variable geometry turbo systems. The minor turbo lag even from VGT can be eliminated and this system can give fuel economy of 20kmpl from a 3 liter V6 engine.
Under most operating conditions, the electric booster is bypassed and boost pressure is supplied by the turbo only. But at low engine speeds, the bypass valve is closed and cooled charged air is then fed through the electric turbocharger, compressed for a second time, and then fed into the inlet manifold. The energy required to run this electric booster will be supplied from brake regenerative system. As there is low thermal inertia than conventional dual stage system, the system gives benefits of lower emissions from a diesel mill.
The technology is currently developed for Audi RS5 concept and there are positive notes from Audi that same will find its place in 2015 Q7. Similar technology of supercharged turbocharger is already explained here.
All in all the intension is to couple a supercharger to a turbocharger to output the best possible fuel economy and the least possible turbo lag.