"We've created the next generation of valve technology, and we retrofitted it into an old SAAB" :giggle:
While I sound sarcastic, its actually REALLY DAMN COOL that it CAN be retrofitted into other/older applications! I bet someone builds one for a Honda K eventually. |
I wonder, in all seriousness, what the parts cost would be for sixteen of these, plus whatever ancillary supporting hardware is needed. I don't see anything in the NASA TT rules which mandates the use of camshafts.
And we're going to need more outputs on the MS3. Rev, would CANbus be fast enough to run a 16 channel high-current driver board with sufficient angular precision for this application? |
Angular precision as in 180-1 trigger wheel 24 inches in diameter?
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Originally Posted by Joe Perez
(Post 981197)
And we're going to need more outputs on the MS3. Rev, would CANbus be fast enough to run a 16 channel high-current driver board with sufficient angular precision for this application?
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This is really funny that this video comes out now my room mate and I were just talking about this two nights ago. We keep bringing it up and arguing over pneumatic or electronic actuation and who out of the car companies pouring money into are going to do it. I was expecting bmw to come out with the first working prototype to be honest.
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Originally Posted by Reverant
(Post 981215)
No way. CAN Bus has a ~2ms latency.
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Originally Posted by 18psi
(Post 981014)
well yeah, but consider a steady state acceleration at ultra high rpm for a long period of time
that's gotta take a lot of air at least from my complete guess having watched that vid. the dude obviously knows what he's doing and is 10x smarter than all of us combined F1 cars use compressed nitrogen at 3000 psi instead of mechanical valve springs, for instance, and that is a closed system. So far, I have seen just one incident where they had to pit the car and top up nitrogen from a smallish canister. Hydraulic systems operate in a closed system to actuate all sorts of mechanical doodads (very technical term there), ranging from excavator rams to hi-speed valves in diesel fuel injectors. |
From what they say the biggest key is the push system.. that little 1" by 1" cube looking piece. They start producing those and this technology will spread like aids at a club ricer meeting.
Mounts can be made so no new head will be necessary. |
Originally Posted by Reverant
(Post 981215)
No way. CAN Bus has a ~2ms latency.
That is not meant to sound like baiting, I legitimately dont understand. What type of setup would be needed to control it |
Yeah it makes no sense to me how we can control the timing and the injector timing and cant control one of these devices. Sure you'll need 16 outputs (8 since they will be in pairs of 2) however currently we're at 8 so... injectors and (sequential) spark plug signals.
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Originally Posted by Opti
(Post 982237)
Is it not viable to just adjust the timing of the events to accommodate for the latency?
That is not meant to sound like baiting, I legitimately dont understand. What type of setup would be needed to control it basically something that would go into a koenigsegg |
And will pay for itself in maintenance and economy in a year.
Dann |
Originally Posted by triple88a
(Post 982243)
Yeah it makes no sense to me how we can control the timing and the injector timing and cant control one of these devices.
Putting any kind of "external" network bus between the main CPU and a subordinate driver, be it ethernet, CAN, or even I2C, adds latency; some more than others, and frequently non-deterministic (variable in an unpredictable or uncontrollable fashion.) CAN was never really intended for high-speed, time-critical stuff. I just wasn't sure how bad it was, as I've never actually used it. Sure you'll need 16 outputs (8 since they will be in pairs of 2) however currently we're at 8 so... injectors and (sequential) spark plug signals.
Originally Posted by Opti
(Post 982237)
Is it not viable to just adjust the timing of the events to accommodate for the latency?
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Wooo no more timing belts!!!
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Yea, it'll be more like timing suspenders with this stuff.
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Originally Posted by Joe Perez
(Post 982279)
Given the present-day MS architecture, you'd need a second MS3-type CPU dedicated to the task. Not a big deal, really. Just parallel the crank sensor to both CPUs, and run a CAN line between them so that the main CPU can pass target data (maps) to the one driving the valves.
It's probable that the delay is not constant. This would make prediction impossible. As far as the delay. Correct its not constant so there needs to be an angular velocity algorithm of some kind for the other cylinders. |
How much current can the MS injector drivers handle? I'm pretty sure these are very similar to injectors on the electrical side, well actually they're probably closer to a boost controller. If I had to guess amperage requirements maybe 300 milliamps. But I'm not an electrical guy.
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Originally Posted by Leafy
(Post 982304)
How much current can the MS injector drivers handle? I'm pretty sure these are very similar to injectors on the electrical side, well actually they're probably closer to a boost controller. If I had to guess amperage requirements maybe 300 milliamps. But I'm not an electrical guy.
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I'm interested in learning the details of those actuators. ECU controlled valves is hardly a new idea; the first conception probably occurred about 10 minutes after the first conception of ECU controlled fuel injection. The problem is that nobody has been able to create an actuator that works, and not for lack of trying.
A quick Google search turned up a little bit of history, though I suspect there's been a lot more effort and investment by most of the big auto makers. I'm sure I've heard rumors of research at GM. There's this from 2001: AutoSpeed - Camless Engines This is is kinda cool. EVIC engine As I said, I'd be interested in finding out what makes the actuators in the video different. |
Originally Posted by DaveC
(Post 982376)
As I said, I'd be interested in finding out what makes the actuators in the video different.
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