6 stroke Tercel engine with electromagnetic valves

[Daox]

we are in the process of building a new camless electromagnetic valve 6 stroke engine(toyota tercel) with a six stroke engine will save 33% on gas and pollute 50% n less

Very interesting. I just wonder how it'll hold up to actual use. Camless engines would be amazing to have.

http://www.youtube.com/watch?v=wDZSOEHQyZE

[orange4boy]

That's an interesting idea. Obviously in the nascent stages here.

Is this one of those with a steam cycle?

Is the electromagetic valve actuation not being developed by one of the big three? That looks like the medium size three to me.

Edit: Answered myself:http://www.greencarcongress.com/2006...in_develo.html

I wonder how it would affect driveability with the valves able to open almost instantaneously. Is this a good or bad thing? Or would they control the speed of opening somehow?

Inquiring minds need to know.

[evolutionmovement]

It looks like the springs are there to control the valves opening and closing. Must finally be going to a higher voltage system. I wonder if they've overcome the reliability and weight issues.

[Christ]

Solenoid-type valves could be programmed with the use of a VTCU (Valve Train Control Unit) (Yay, another computer) to vary opening/closing speed and lift based on RPM/Load/Throttle Position/Etc.

Of course, millions of dollars of R&D and engineers beat me to it... I've had this idea in my head for years.

[ConnClark]

I would love to hear how just making it 6 strokes leads to 33% fuel savings. Unless of course it makes 33% less power. Its not like they are utilizing double expansion or something. Pushing dead cylinders isn't an effective way of saving fuel.

Sounds like smoke and mirrors

[Frank Lee]

"They" were going on about solonoid valves when I was in school- oh, about 100 years ago. Still waiting; not holding my breath...

[moonmonkey]

ford made the solonoid accuated valve engine, i saw it in a hotrod mag over 20 years ago,,obviously they had problems making it work correctly, because it would have done wonders for the ice,, no cam,rockers,big friction and heat reducer, also being able to vary the valve opening and closing event by ecu to keep the engine in its peak range of volumetric effecientcy, at all times,,you could have a" hotrod cam" and a" fe cam" too little too late by the time they make it work right we will be offered battery powered alternatives (i hope).

[Rokeby]

Fiat has electrohydraulic valve actuation as the centerpiece in its new
MultiAir system:

"At the outset, world-wide research efforts were focused on the
electromagnetic actuation concept, by which valve opening and closing is
obtained by alternatively energizing upper and lower magnets with an
armature connected to the valve. This actuating principle had the intrinsic
appeal of maximum flexibility and dynamic response in valve control, but
despite a decade of significant development efforts, the main drawbacks of
the concept – it being intrinsically not fail-safe and its high energy
absorption – could not be fully overcome.

"At this point most automotive companies fell back on the development of
the simpler, robust and well-known electromechanical concepts, based on
valve lift variation through dedicated mechanisms, usually combined with
camshaft phasers to allow control of both valve lift and phase.

"The main limitation of these systems is low flexibility in valve opening
schedules and a much lower dynamic response; for example, all the
cylinders of an engine bank are actuated simultaneously, thereby excluding
any cylinder selective actions. Many similar electromechanical valve control
systems were subsequently introduced over the past decade.

"In the mid ’90s, Fiat Group research efforts switched to electro-hydraulic
actuation, leveraging on the know-how gained during its Common Rail
development. The goal was to reach the desired flexibility of valve opening
schedule air mass control on a cylinder-by-cylinder and stroke-by-stroke
basis.

"The electro-hydraulic variable valve actuation technology developed by Fiat
was selected for its relative simplicity, low power requirements, intrinsic
fail-safe nature and low cost potential."

http://www.youtube.com/watch?v=5IrPcmMHqHE

And this.

[Christ]

The thing about solenoid actuated valve trains is that they're so expensive that the current return on gains wouldn't be worth the cost associated with implementation. Just the programming alone is very complex, and requires more sensors than are currently in place, which necessitates a new feedback system for the powertrain controls, then the additional electrical energy necessary, the failure rate of solenoids which work constantly, the PWM controls needed to prevent the valves from "snapping" open and closed (creating fluid dynamics nightmares beyond comprehension), and then the excess programming to do what the solenoids were intended to do beyond normal operation - determine if the driver wants power or FE, and adjust the "profile" accordingly. This would require some sort of logic circuit based on inputs and a feedback loop, so much more complex than what we have now, and for gains in the realm of ~20% power or FE (assumed number).

[Old Tele man]

...but, computers can do ANYTHING, just ask a software programmer (ha,ha)!