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The SuperTurbo
A turbocharger with a pulley assembly located between the two housings | |
Hello. I just finished a project for one of my classes where we had to patent a new idea. My idea was a turbocharger enhancement which totally eliminates turbo lag. A pulley is attached to a clutch which placed on the rotating shaft of a turbocharger. A belt, which is connected to the engine's other
moving parts, drives the pulley which rotates the shaft, spinning the turbine of a turbo. At higher RPM (when the exhaust kicks in), a sensor activates the clutch, which then disengages itself from the pulley. As a result, the pulley movement can be haulted without interference with the turbo. The clutch stays connected with the shaft, "freewheeling" until the engine speed slows down again, which is when the clutch re-attaches itself with the pulley and the process starts all over again. What do you guys think?
Concept drawing
http://img.photobuc...ykerz28/TWOVIEW.jpg
An "inside" view of the device. [Strykerz28, Jul 28 2005]
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So this pulley is attached to the turbine shaft, which is potentially rotating at around 100 000 rpm? How do you intend keeping the belt in contact with the pulley without so much tension that you lock the turbo solid? (Maybe I've misunderstood how a turbocharger works) |
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With a pulley ratio of 2:1, and the engine at an rpm where the turbo isn't driven by exhaust gas, then I would expect the turbo to be rotating, via the clutch, at a maximum of 4,000rpm. But the previous comment mentioned the normal turbo speed is 100,000rpm.
I have a feeling that the turbo takes longer to accelerate from 50,000 to 100,000 than from 0 to 50,000 (linked to rpm squared?), so although your basic idea is quite interesting, I don't think there would be much advantage.
Further, the chances are that the turbo is already rotating at >4,000rpm at engine idle. |
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The pulley ratio will be far greater than 2:1. The system will use a pulley as small as possible to increase repitition speed. Now remember, this pulley aid will only be used at very low engine speeds (<3000 rpm), when the turbo hasn't even come out of vacuum yet.
Also, this pulley system will be a far greater aid to extremely large turbos (like in high performance supras), where lag is a major issue. |
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I think a small pulley which drive a large pulley is OK, but the other way round is very difficult and prone to slip, especially with a large ratio. I found out by experience with a toothed drive on an electrical scooter. The small pulley on the motor drove the back wheel OK, but in regenerative mode it slipped badly. |
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I think it doesn't "totally eliminate" turbo lag, nor even get close. It may help a little, but driving it with a belt limits the RPM to something very low by turbine standards. Driving a loaded small pulley from a large one at high RPM is going to burn up the belt. |
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In what you describe, you may not need a sensor on the clutch if you just make it inside out from a standard centrifugal clutch. There should never be a need to stop the pulley movement, if that's what you mean by "haulted." |
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You'd be a lot better off with an air compressor, an air tank, and a nozzle somewhere. Or put a flat-plate motor around the outside of your clutch. It wouldn't work well, but it has a better chance than a belt drive for what you've designed. |
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I like the de-clutch concept. Your CAD model was pretty good. Your spelling and writing is better than most new folks we've been getting lately. Welcome to the Halfbakery, Strykerz28. |
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If the turbo had a constant velocity transmission similar to audi's high HP unit and was shaft driven like a Vortech supercharger, this might be more viable. |
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But not bad considering turbos have been beaten into submission on this site. |
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You could use an over-running (sprag) clutch, but anything will probably get too hot. |
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Various types of anti-lag systems blow fuel and air in the exhaust before the turbo to spool it up. Think older pro-rally and tractor pull flamethrowers. |
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that is a supercharger with an extra axle that is not needed if you have the belt. it will just be somthing in the way of the exhaust. |
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Would A chain drive work? Or even a shaft and four bevel gears? |
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it would be more effiecent but still it would be a turbocharger. but still wasteing energy on turning 2 axles not just one |
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Maybe a (very!) high-speed electric motor on the turbo shaft would do this job better. Downside: it would add a heckuva lot of weight, so even though it would decrease spool-up times, it would sharply increase turbo lag. |
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Maybe a compressed air reservoir that could shoot at the turbine during spool-up instead? |
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Okay, I see [bacon] beat me with the compressed air. Well, that's two votes for air. |
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I think if you're going to go to all the trouble of adding a mechanical drive to a charger, you might just skip the turbo entirely and use just a supercharger, or else run both, optimized for their different performance regimes. The belt won't take the strain, and a step-up gear train will be too lossy. |
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