ESE's works engine tuner

[husaberg]

If we are going to open/close things electromagnetically why not do away with the rotary valve and adapt push pull voice coil servos to Flettners flying gib idea and have totally asymmetric and variable inlet timing and when the engine is truly on the boil. Hold them both open for Frits's 24-7 timing.

Attachment 341040 Attachment 341041 Attachment 341042

The idea was to use it only at low speed for starting. then as you say 24/7
I think Flets gib is great but i am not sure it could be moved fast enough to serve as a starting valve.
It would be great if i was wrong and it could be though.

[TZ350]

I think Flets gib is great but i am not sure it could be moved fast enough to serve as a starting valve.

Sure, maybe not as it is but a twin guillotine thing might. A voice coil arrangement each end shuttling the guillotines back and forth. 12,000rpm is only 200 Hz. 20 to 200 Hz is the audio sub woofer range. 200Hz is not very fast for electrotrickery.





https://www.sae.org/publications/tec.../2017-01-1070/

2017-03-28Research on a New Electromagnetic Valve Actuator Based on Voice Coil Motor for Automobile Engines 2017-01-1070


The electromagnetic valve actuator (EMVA) is considered a technological solution for decoupling between crankshaft and camshaft to improve engine performance, emissions, and fuel efficiency. Conventional EMVA consists of two electromagnets, an armature, and two springs has been proved to have the drawbacks of fixed lift, impact noise, complex control method and large power consumption. This paper proposes a new type of EMVA that uses voice coil motor (VCM) as electromagnetic valve actuator. This new camless valvetrain (VEMA) is characterized by simple structure, flexible controllable and low actuating power. VCM provides an almost flat force versus stroke curve that is very useful for high precision trajectory control to achieve soft landing within simple control algorithm. The halbach magnet array and coil structure are specially optimized to provide flux-focused interleaved magnetic circuits for maximizing the actuating force. 2D and 3D magnetic simulation is applied to analyze the performance of VEMA. A cascade feedback with velocity and acceleration feedforward control structure is developed. Two cascade PID feedback controllers are used to realize the position and current loop and the feedforward controller is applied to enhance the trajectory tracking performance by utilizing the information from the repeated precognition reference trajectory. Simulated and experimental results indicate that the proposed VEMA and the control methodology are capable of achieving fully flexible valve motion with low seating velocity and power consumption.

[Frits Overmars]

If we are going to open/close things electromagnetically why not do away with the rotary valve and adapt push pull voice coil servos to Flettners flying gib idea and have totally asymmetric and variable inlet timing and when the engine is truly on the boil. Hold them both open for Frits's 24-7 timing.

The simplest solution for totally asymmetric and variable inlet timing is the common reed valve; it doesn't need any governing. It won't flow as well as a rotary valve,
but below the power band that doesn't matter. And once we're in the power band we can hold it open 24/7 as you say. A simple servo motor can do that; we can even use the exhaust power valve servo if there is one.
No need for any electromagnets. I doubt if those could be fast enough for cycle-to-cycle operation anyway. It's not like lifting an injector needle 0,1 mm off its seat;
a reed valve should move about a hundred times further, but at the same frequency as that injector needle....

[husaberg]

The simplest solution for totally asymmetric and variable inlet timing is the common reed valve; it doesn't need any governing. It won't flow as well as a rotary valve,
but below the power band that doesn't matter. And once we're in the power band we can hold it open 24/7 as you say. A simple servo motor can do that; we can even use the exhaust power valve servo if there is one.
No need for any electromagnets. I doubt if those could be fast enough for cycle-to-cycle operation anyway. It's not like lifting an injector needle 0,1 mm off its seat;
a reed valve should move about a hundred times further, but at the same frequency as that injector needle....

My original musing Frits was to you the electromagnet to keep it open. Once it was going well allowing the 24/7. Not really well written though by me though. As i did say open and shut.

[TZ350]

The simplest solution for totally asymmetric and variable inlet timing is the common reed valve; it doesn't need any governing. It won't flow as well as a rotary valve, but below the power band that doesn't matter. And once we're in the power band we can hold it open 24/7 as you say. A simple servo motor can do that; we can even use the exhaust power valve servo if there is one.

True, complex is easy but hard to do better than the simplicity of a reed and actuator to hold it open for 24/7 ......

[TZ350]

My original musing Frits was an electromagnet to keep it open.

I agree, that could be done very easily with a spring steel reed and an electro magnet in the roof of the reed cage to grab and hold the reed open when the inlet resonance is in the right place for 24/7.

[husaberg]

I agree, that could be done very easily with a spring steel reed and an electro magnet in the roof of the reed cage to grab and hold the reed open when the inlet resonance is in the right place for 24/7.

I also think you could also impregnate the glassfibe or Carbonfibre reed with a strip of iron. it only needs the very end to be be magnetically attractive

[katinas]

The base engine is snowmobile 2-cylinder inline RMZ550 76x61mm.
Will see how it will work. For me important to have good power on high rpm, cause this engine will drive propeller (brake load depend of rpm in cube).

With 76mm x 61mm and rod (from your previous pic, add, looks like 25mm smaller dia /46mm bigger dia), pumping volume reduction is just 30cc, so from 276cc to 246cc it would be minimal influence.
Its similar to Rotax 503 engine.

Another important thing, is that on two stroke, crankcase and crank is very close and this space not adapted to work just with oil, too much drag. I remember when filling just about 15 ml oil, engine didnt revs until some oil was pumped through left side open crank bearing ( mistake again because of some drag) to side empty crankcase space. Interesting how much energy wasted for this, when engine revs high. Maybe crankcase must be modified in some ways to work with oil.
Another mistake in my configuration, is that crankcase work with negative pressure. Reeds in crankcase (if they used), must be oriented to hold positive pressure, not negative.
Positive pressure help to prevent some fuel leakage through smaller piston seal to crankcase , little help to stop piston at BDC and oil work in pressurised, not stretched environment

[TZ350]

I also think you could also impregnate the glassfibe or Carbonfibre reed with a strip of iron. it only needs the very end to be be magnetically attractive

True and probably would work but no need, because we are looking to 24/7 for power so any old steel reed will do to get us into the zone before holding the reed open 24/7.

[andreas]

[QUOTE=husaberg;1131126268]Why not have them hinged.

They could also be opened and closed electromagnetically.
[/QUOT

Ok, but no chickens.

[husaberg]

That's cunning. Does it actually work or is it just a concept ?

Given the tuning fork likeness, you'd think it was a natural for Yamaha...

I never noticed that, Looks a heck of a lot like a tesla valve

[jbiplane]

Maybe crankcase must be modified in some ways to work with oil.

Thanks for valuable comments. Going to instal pressure sensors in few places and understand how everything works.

You are correct the diameters are 25 and 46mm, next time will make a bit smaller part.

[Haufen]

I did read a bit more into it:That sounds great if you have an energy source like hydro or solar power. But what if you don't? Then the 'lot of electricity' has to come from fossile fuels. Or biofuels

By the way, carbon-neutral liquid fuel (fuel from electricity) as well as fuel cell (electricity from fuel) research are being performend in my present home town Dresden
by a company called Sunfire, of which my former partner in the Dresden Technical University is a staff member, so the concept wasn't entirely new to me.

So help me out here: if you were familiar with the concept, why do you call it bullshit? Did you tell your former co-worker that it's bullshit, too? What did he respond?
What would be the range benefit of the fuel cell stack researched in Dresden (SO type?) compared to current hydrogen stacks when sized for vehicle applications?

And by the way, I may be a bit closer to both fuel cell technology as well as synthetic fuels than just happening to live in the same city or having a former co-worker being a staff member. And in this surrounding, there is no mileage problem with hydrogen fuel cell vehicles (although the gas station network could be narrower), the research on hydrocarbon fed fuel cells for vehicles has been shelved a decade ago or so (but seems to do ok with power plants), synthetic carbon neutral fuels are regarded as a realistic means to meet upcoming CO2 targets (in combination with other technologies, but compared to new technologies they'd have an effect on the already existing vehicle fleet, too!). And surely nobody would use fossil fuel to generate electricity to then generate synthetic fuel (except for research purposes). If there were no green energy source available that electricity would come from nuclear power plants, I suppose (did not say I like them or the idea). Also, overcapacities in the power grid might be used much more efficiently than they are now when utilised to make synthetic fuels.

So far cost is the issue of fuel cells versus batteries. We are barely getting battery costs low enough to make electric vehicles competitive in price with luxury IC cars. So far fuel cells look good for larger vehicles. We'll see what happens with trucks. Of course batteries require a clean electric generating system. That's easier to do on a large scale than in a car size plant. Quite a few people are using solar cells with batteries to generate power for their houses and cars. That works best in the US southwest and is more expensive than conventional power generation so far.

Lohring Miller

US based Nikola Motor Company plans on starting series production for hydrogen fuel cell trucks as early as 2020 ( https://nikolamotor.com/one )

[Frits Overmars]

So help me out here: if you were familiar with the concept, why do you call it bullshit?

You're right Haufen. I'd never call any form of research bullshit. My frustrated reaction was mainly triggered by the way politicians and marketing people keep suggesting that CO2 coming from once cource differs from the same gas coming from another source, when it suits their purposes ("this fuel does not add CO2 to the atmosphere")
and the way they keep mixing the concepts of energy sources and energy carriers for the same reason.

[husaberg]

You're right Haufen. I'd never call any form of research bullshit. My frustrated reaction was mainly triggered by the way politicians and marketing people keep suggesting that CO2 coming from once cource differs from the same gas coming from another source, when it suits their purposes ("this fuel does not add CO2 to the atmosphere")
and the way they keep mixing the concepts of ernergy sources and energy carriers for the same reason.

The largest retailer in NZ just declared themselves carbon neutral.
I was think wow how did they do that being a retailers of mainly plastic junk aChinefrom.
Turns out they only include it from when they leave China and not the manufacturing or and they also are buying carbon credits cheap off others, they are also pledging to plant 2 million trees.
WE got screwed with all the carbon credit stuff as they dont include pasture or native forests. only trees planted after 1985 or something.
https://webcache.googleusercontent.c...&ct=clnk&gl=nz