Bmw patented the electric-powered turbocharger

Article by Christian A., on November 4, 2011

BMW has recently patented the electric-powered turbocharger, a piece of technology that will eliminate turbo lag, according to a recent Bimmerpost article. BMW was quick to realize that bigger turbos can’t be the solution to achieving smooth, refined outputs. This is what made it use twin turbos for the 3.0-liter.

This electric forced induction system will eradicate the lag that remains at the bottom end of the rev range. It had been rumored that this technology will be used in the X3 M in Frankfurt but this didn’t happen. There are reports that instead, it will go in the new M3, which is powered by a 3.3-liter V6.

From the schematics, it seems like the patent could be used as a strand-alone turbine. This system currently has an electric motor that never stops running if the turbo boost is not sufficient. By stepping on the bas, the turbine that uses exhaust to power the air compressor that feeds the engine isn’t used. The electric motor accomplishes the job instead.

Upon hitting the required exhaust pressure, the electric motor functions like a generator and this recharges the battery. This also guarantees that the turbine doesn’t run too fast. This suggests that there’s no need for a waste gate.

At medium load, the electric motor and turbine could move the compressor. What BMW offers is a very efficient, incredibly frugal machine. It’s focused to have low-end torque so it’s not likely to have anything to do with the M3. What it’s expected to have is a tri-turbo or maybe a bi-turbo configuration.

When spring arrived in 2010, customers were sure to be excited once the BMW M3 was launched as it delivers excellent driving performance mixed with both lower fuel consumption and emission levels. This is because it is equipped with the BMW EfficientDynamics and complemented with the Auto Start Stop Function. This combination is put in the BMW M3 Convertible, BMW M3 Sedan, and BMW M3 Coupé, as standard.

With this new feature, the M3 is expected to boast a lower average fuel consumption and a drop in CO2 emissions by as much as 8%, depending on the type of transmission. This is around 24 grams of CO2 for every kilometer.

While the Auto Start Stop Function has long been a feature in many of BMW’s models, it will be in the M3 series that it will be paired with the dual clutch transmission. For those not familiar, this is a feature that ensures that idling phases are avoided like when in a traffic jam or stopping during a red light.

What happens is that when the vehicle stops moving, the system immediately turns off the engine and thus avoid any unnecessary fuel consumption. Once the driver intends to move again, the engine is automatically restarted. This function will be in models that have the usual manual 6-speed transmission as well as the M dual clutch transmission with Drivelogic.

Thus aside from the ActiveHybrid X6 and the ActiveHybrid 7, the new M3 will be one of the first to have this efficiency-enhancing feature that is complemented with the automated manual transmission.

As mentioned, the efficiency will largely depend on the transmission. Take for instance the M3 Coupe which is powered by the V8 engine and paired with the M dual-clutch 7-speed transmission with Drivelogic. Output is measured at 309 kW (420 bhp) with average fuel consumption merely at 11.2 liters/100 kilometers (EU test cycle). Using the manual 6-speed transmission, average fuel consumption is at 12.4 liters.

These are the same figures on the Sedan version. Indeed, the excellent performance coupled with the amazing efficiency makes it outstanding. Going to back to its 4.0-liter V8 engine, as a result of its unique propulsion, it allows for superior acceleration response. The reason why this engine has excellent performance qualities and a high level of efficiency is due to the fact that it was made to be exclusively equipped in the M3.

By fitting in the Auto Start Stop Function, the extra efficiency potential of the engine is tapped. For those who prefer to have a version that offers a sportier profile, BMW will also be coming out with a Competition Package by the Spring of 2010.

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Topics: bmw



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