Electric Superchargers – How Audi Is Eliminating Turbo Lag

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The Audi SQ7 is powered by a 4.0L sequential turbo diesel V8. It's good for about 435 horsepower and 660 lb-ft of torque, which is great, but the fun doesn't stop there. In order to eliminate unresponsive nature of turbocharged engines, Audi has fitted the car with an electric supercharger, the first in a production vehicle.
This means adding an onboard 48V system that can handle the additional power requirements of the electric powered compressor (EPC), which at full throttle can produce 7 kW of power, enough to spin the compressor wheel up to 70,000 RPM in just a quarter of a second. Full details of how this system works in the video, as well as animations.
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Hello everyone and welcome in this video . we are talking about how outtie is . eliminating turbo lag through the use of . the world's first production electric . supercharger . so traditionally superchargers are run . off of the engine in this case the . engine is powering a three kilowatt . generator which is powering a 48 volt . battery which is then powering a seven . kilowatt electric motor which is . powering the compressor side that . compressor to pull an additional air to . compensate for turbo lag so how do is . calling this an electric powered. compressor you can think of it as an . electric supercharger where instead of . the engine driving it you have an . electric motor driving that compressor . wheel so first i want to talk about the . air flow looking at the engine it can . look a bit complicated as what's going . on so i've broken it down here on the . whiteboard so we can kind of figure that . out. so initially you're just pulling in the . air through one of those turbochargers. so you've got your air filter the air . comes through that first turbo charger . on valve for the second turbocharger is . off blocked off so you can't have air. coming through there that air then . travels split between two different . inner coolers and then at this . intercooler this valve will be open . right here let's say we're not using the . electric supercharger then the air . passes through comes combines and then . it's split between the two intake . manifolds for each of the cylinder banks . then it goes from all eight of these . cylinders to this single exhaust right . here before passing out the back now . we'll get into the different stages as . it gets that into higher rpm but . essentially how this electric . supercharger works is when you initially. press on the gas you want that instant . response you don't want turbo lag and so . that's where the electric motor comes in. in less than a quarter of a second it . can spoil up to 70,000 rpm and provide . that immediate boost to fill the delay . of turbo lag before you know the the . main turbocharger has started spooling . up so you'll have this valve closed off . right here and then the compressor wheel . will pull air directly push that into. the eight cylinders now that's when you . initially press on the gas as you start . to get into you know those those low to . mid higher rpms the low to mid rpm range. then you start to just rely on the . turbocharger itself once those exhaust . asses have been built up and you no . longer need this electric supercharger . to compensate for the lag so then you're. just running on this single turbocharger . and then as you start to get to that . mid-range rpm into the higher rpm and . you're still asking for full power . they've actually split now where they'll . power both turbochargers and in this. case you'll have air coming through both . of them this valve right here will be . open so you're now pulling in air . through both turbochargers you're . powering both turbochargers and you'll . have sufficient boost for that mid to . high rpm range while operating under . full throttle so they've also done a . super clever thing here with the exhaust . valves and so the way it's split up is . on the low rpm side you're only using a. single exhaust valve for each cylinder . and all of that air is being rounded to . the first turbocharger and then there's . a variable valve system which will . activate the second exhaust valve and . that second exhaust valve for each . cylinder goes to the second turbocharger . so each cylinder has one exhaust valve . that powers each turbocharger and you'll . just use the one exhaust valve for those . low to mid rpm ranges and then you'll . use both exhaust valves to power both . turbos for that higher rpm region where . you want more power and you want to be . able to take advantage of using both . turbos so it will act like a single. turbo engine low to mid and then mid to . high rpm it will act like a twin turbo . engine as it splits that exhaust gases . into both of them now a lot of people . wonder why you can't just slap on an . electric turbo on any car you've got a . 12-volt battery system why can't you . just use that to you know bring in more . air and really it comes down to power so . those there are aftermarket ones that'll . say like it's an electric supercharger. and it's powered off your 12-volt . battery those are nonsense they don't. have enough power to actually do . anything and so that's what i kind of . want to discuss here so the reason how . to put in a 48 volt system is to be able . to power this seven kilowatt motor you . need a significant amount of power to . pull in a lot of air and to do that very . quickly so power is equal to current . multiplied by voltage so if you have . amps you multiply that by 48 volts which . is what this battery delivers and that . gives you seven kilowatts or seven . thousand watts about nine and a half . horsepower if you're using a 12-volt . system you've got 100 45 amps multiplied . by 12 volts you're only producing 1. 75 . kilowatts and you know this is a huge . demand your car battery already has . plenty of things that's powering all the . onboard electronics you know your hvac . system plenty of different things your . sound system so it's got its . responsibilities on the car the spark. for the engine in the case of gasoline . engines it has its responsibilities and . considering you know the idea of putting . on an electric supercharger on top of . that just simply isn't feasible there's . not enough power to do it so that's why . out has added this separate 48 volt . system and this means adding a lot of . stuff to the engine this is why it's not . done on every car out there it's because . it's expensive and it couldn't you know . it's of course complicated to do so . you're adding you know you're adding a . generator to the system you're adding a . 470 watt hour 48 volt battery to the . system you're adding that electric . supercharger to the system and all the. associated piping that goes along with . it and you're also adding a dc to dc . converter 48 volt down to 12 volt for . other onboard systems and this is all in . addition to the 12-volt battery system . that's already on the car so you know . this isn't something that can be cheaply . done hence it's in you know a super nice . expensive outi sq7 really nice quick suv . and so you know in a more expensive car . it makes sense in cheaper cars it's not . a simple solution as of the added . complexity and cost that goes along with . it but i think one of the really . important things to understand is that . it takes a lot of power to do this it's . not something that you can you know . depend on a 12 volt battery to do for . your car so if you guys have any. questions or comments of course feel . free to leave them below thanks for . watching . .
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