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New technology - electric turbos

D

David G

Well-known Member
VW is releasing their new Diesel in Europe. I think the turbo is all electric, there is a generator on the exhaust side and motor on the intake side. The turbo is supposed to reach maximum speed almost instantly, so no apparent lag. The generator also reduces the load on the alternator when the power is not needed for boost.

There are also derivatives of this that only have the motor as assist on the compressor side.

I think this is a good idea.
 
Well that would make it so they could play with the boost pressure and timing easily. I guess that we will see more and more computerization on the current and future motors.
 
Doesn't that defeat the entire purpose of using the lost energy in the exhaust to add to the engine's output? Sounds like a lot of extra complication to replace a relatively simple and reliable mechanical device.
 
People are calling it the E-Charger, or eBooster, it is a separate system from a regular turbocharger. They are just trying reduce the initial lag you get from a turbo when used on a passenger car.
 

Some systems use a motor generator coupled to the turbo shaft. The turbo is motored up to speed to reduce lag. Once up to speed and with enough exhaust gas energy the turbine both powers the compressor and generates power .
There were some experiments used on reciprocating aircraft engines with a machanical drive from the turbo to the crankshaft to extract a percent of two of otherwise lost exhaust gas energy.
 
Technically, a "turbocharger" is an exhaust-driven supercharger. So it is a type of supercharger and not something in a different category. If someone builds one that is electric powered - and not driven by an exhaust-turbine, then is is an "electric supercharger." VW can call it whatever they like though.
 
Hello David G,

Nothing new, electric turbos have been around for many years. I may still have brochure showing the electric superchargers 25 plus years ago. The were coupled with exhaust driven superchargers to relieve turbo lag. Good article, I read through it quickly and there are a couple of miss statement. One statement was about the use of a turbocharger instead of a supercharger. Any device that pressurises the intake above atmosferic pressure IS a supercharger, regardless of how it is driving. Also they stated that air goes to an after cooler before it reaches the engine intake, not true!
There are many combination of aftercooling, it all comes down to application, some have none

Guido.

Guido.
 
You are quite right. ANY device that raises the pressure in the intake manifold is a form of supercharging. Also right about the coolers. They are called intercoolers, and are not necessary. They do help keep the intake air charge cooler to reduce the formation of NOx, as does EGR.
A turbocharger is by definition exhaust driven. Making one electrically driven makes it by definition NOT a turbocharger, but still a supercharger.
Another misconception is that turbochargers are driven by exhaust heat. No amount of heat will spin the turbine or impeller blades. Put one in an oven and see for yourself.
 
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