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Project idea for my engineering class

 
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Old 09-25-2012, 06:19 PM
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Project idea for my engineering class

Our engineering project for this semester has us designing a mechatronic system that uses our microprocessor and programming it to a function, such as turning on a switch or something when the signal or relay is switched on. I wrote a mechatronic paper earlier this semester over VTEC, because VTEC makes use of a electronic pressure sensor in the VTEC solenoid to trigger the hydraulic pin inside of the rocker arms and so on... I'm sure you all know that. Anywho, I was thinking that maybe I could recreate the system. I figured I could do this by getting an engine head that has VTEC, whether it be an H22 or a B16, it doesn't really matter, although an H22 would be nice since that's what I have. I'm sure I could find one at a junk yard around here.

Now I'm not trying to rebuild an engine or any of that. I just want to simply represent VTEC technology for my project. I thought that maybe I could use the microprocessor to switch on VTEC when the rpm threshold is met. Of course I wouldn't actually use 5200 rpms or whatever, but I would recreate it for demonstration purposes.

Like I said before, I want to take the engine head, leave the valve cover off to show the cams and the operation. I figured I could use an external power source to operate the cams, then I would have the rocker arms in their regular operation (profile 1), opening the valves at their regular pace. Then I would set a limit or threshold on the microprocessor to regulate when VTEC should "kick-in, yo". I know it's based off of oil pressure right now but is there a way I could make this work using the microprocessor and not actually "running" the engine?

I really think this would be a cool project but I want to make sure I have it all straight before I start putting time and money in to it.
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Old 09-25-2012, 07:30 PM
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Re: Project idea for my engineering class

I LOVE this idea.

Some constructive criticism;
-the valve springs are VERY stiff, and going to provide ALOTT of resistance from the cams rotating. Since this is simply for demonstration purposes, I would remove the valves and springs, but leave everything else rockers, LMA's, cams...
Cuz if you keep the springs in there, your gonna hafta bolt down the head pretty damn securely or else it'll be wobbling everywhere with the valves opening and closing. Than once you do bolt it down, your gonna need a pretty damn powerful motor to rotate both cams to overcome the valve springs.

-unfortunately I haven't taken apart a Vtec head to know the specifics/technical stuff in there, but maybe there is a way to keep it oil pressure driven. If there's an oil inlet on the rocker arms (or before there, or w/e) you can have an oil feed line to the inlet, and on the other side of the line, just a simple electromagnetic solenoid, that once is activated, pushes a piston inwards creating oil pressure, pushing the pin.

man i wish i put this much effort into what i do at work




'tis all i can think of for now.
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But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 09-25-2012, 07:44 PM
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Re: Project idea for my engineering class

Great stuff. I appreciate it! Do you think I could leave the valves in though? Or find a way to keep them in there? They do play a big part in showing how it works, as they are what allow more intake/exhaust flow. If I can, that would be great. And I've been doing some further research and found some auto training videos for how the system is actually switched on from the ECM. I guess the oil pressure is read from the VTEC solenoid and then released at the proper time to the hydraulic pin? So would I have to somehow use my microprocessor to read the VTEC solenoid and then direct it to the pin just like the ECM?
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Old 09-27-2012, 12:44 AM
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Re: Project idea for my engineering class

Anyone else have any input? I'd really like to make this work if it's viable and cost-efficient!
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Old 09-27-2012, 09:39 AM
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Re: Project idea for my engineering class

Yea you could leave the valves and springs in. You could simply cut a hole in the table (or w/e you mount the head to) for clearance for the valves. You just gotta make sure the head is SECURELY fastened to the table, cuz the torque required to rotate the cams is gonna be huge to overcome the springs.

To spec out the size/hp motor you'll need, I'm thinking get a torque wrench, put it on the cam bolt (14mm, i think? ), and see how much tq it takes to turn the cam to open the valve, and multiply that by 2. That's how much you'll need @ the cams, which you can achieve with a smaller motor and gear ratios.

I'm BSME.... anything electrical, you're on your own
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2007 Sea-Doo RXT 215; ET 127 +3 S/C impeller, DIY 3" intake, DIY resonator delete/free flow exhaust, DIY oil catch can, Rule 500gph bilge pump


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But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 09-27-2012, 03:45 PM
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Re: Project idea for my engineering class

I think I'm going to remove the springs so there won't be a big obstacle in powering the cams. I was thinking about maybe buying a few less-stiff springs, a lot less stiff, to keep the model accurate but still having an easier time demonstrating the motion. I thought I could even just rotate it by a hand crank? Then I could program my microcontroller to read a value from a rpm meter? If there is one I could find? I could set a threshold and when I start turning it faster, VTEC could kick in. How would I go about rigging oil pressure though? Since I won't have the oil pressure that normally comes from running the engine, how would I recreate that pressure and release it to push the pin and engage VTEC?
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Old 09-27-2012, 07:51 PM
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Re: Project idea for my engineering class

I already told you my idea for oil pressure w/ an electromagnet.
Looking at the manual, it looks like the oil inlet for the entire head is thru the vtec solenoid, so it looks like you just gotta supply oil to the solenoid, than from there it goes to the rockers. Also the Vtec solenoid and pressure switch are the same component, so once the correct pressure (it looks like >57psi) is achieved, the solenoid opens, engaging vtec.

I was thinking about switching the springs to a softer spring rate as well, but the more I think about it, with a big enough of a gear ratio, a hand crank is possible.
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1995 Honda Prelude SE Turbo; 250whp, 275wtq @ 10psi Soldddd!!!

2000 Acura TL; DD
2005 Stage2.5+ Subaru WRB STi : RzKar!
Ivey Tuned - Advan - Cobb - Rallispec - CP - Perrin - ACT - KillerB - Carillo - TurboXS - Defi - Innovate - Walbro - DeatschWerks - Feal - H&R - Alpine - Infiniti - Curt

2001 Kawasaki STX1100 D.I. - Sold!
2007 Sea-Doo RXT 215; ET 127 +3 S/C impeller, DIY 3" intake, DIY resonator delete/free flow exhaust, DIY oil catch can, Rule 500gph bilge pump


Quote:
Originally Posted by Brash View Post
But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 09-29-2012, 01:49 PM
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Re: Project idea for my engineering class

Gearing a hand crank sounds a lot easier than respringing all of those arms lol. How big would I have to get it to offset the pressure of the stock springs?
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