VVT ideas and testers

Testing and development of Megasquirt 3

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y8s
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Re: VVT ideas and testers

Post by y8s »

Disregard. When I tried it later in the day it worked fine. Just needed one more reboot I guess.
AbatelliCristian
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Re: VVT ideas and testers

Post by AbatelliCristian »

Hi,
I have installed ms3+msx in s65 engine. I load firmaware alpha10 for vvt vanos.
When I select vvt PID Q3 in msx is very hot. What's the problem?

Have second problem: vvt4 not run. If select test, not run solenoid. I test the port with pwm generic and solenoid run, but in vvt test no.
Last edited by AbatelliCristian on Sun Jun 12, 2011 2:42 pm, edited 1 time in total.
jsmcortina
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Re: VVT ideas and testers

Post by jsmcortina »

An MSQ and information on your settings would give us a chance of answering your question. However, that potentially sounds like the same issue that y8s had on his install. You might want to try wiring a 1N4001 across the VVT solenoid with banded end towards 12V.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

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AbatelliCristian
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Re: VVT ideas and testers

Post by AbatelliCristian »

I edit previus post with msq... and second problem...
jsmcortina
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Re: VVT ideas and testers

Post by jsmcortina »

Do you really need to run the solenoids at 1kHz ? That's a great way to boil the flyback circuit. Your MSQ has only 2 VVTs enabled, so VVT3, VVT4 aren't going to do anything.

James
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AbatelliCristian
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Re: VVT ideas and testers

Post by AbatelliCristian »

?? I use 75 Hz... and I setting 4 vanos No vvts...
I load ancoder bmw v10.
I visualized all vtt angle in tuner studio, but vvt 4 not run
AbatelliCristian
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Re: VVT ideas and testers

Post by AbatelliCristian »

I load alpha 9 and vvt4 is ok. the problem is alpha 10
but i see other problem:
vvt1 exhaust
vvt2 intake
vvt3 exhaust
vvt4 intake

vvt1 and vvt3 angle is ok, but vvt2 and vvt4 angle is <> vvt2=65 vvt4=0. if vanos on vvt2=0 and vvt4=65.

exhaust run ok with pid and vvt timing table, but intake have problem
jsmcortina
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Re: VVT ideas and testers

Post by jsmcortina »

The VVT4 problem is a newly introduced simple bug.

I've fixed it for the next release. Send me your email and I'll send you test code.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

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AbatelliCristian
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Re: VVT ideas and testers

Post by AbatelliCristian »

y8s
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Re: VVT ideas and testers

Post by y8s »

jsmcortina wrote:An MSQ and information on your settings would give us a chance of answering your question. However, that potentially sounds like the same issue that y8s had on his install. You might want to try wiring a 1N4001 across the VVT solenoid with banded end towards 12V.

James
Q3 getting hot was exactly the problem I had.

Curious if this issue is going to keep popping up as more people start using VVT.
AbatelliCristian
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Re: VVT ideas and testers

Post by AbatelliCristian »

Now the new code is all ok for vvt.
with 1n4001 the q3 is ok....
Now I test timing table...
AbatelliCristian
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Re: VVT ideas and testers

Post by AbatelliCristian »

Exhaust vvt is all ok and pid work, but intake I have problem. In gauge the angle is correct in vvt2 and vvt4, but if in timing table I chenge the value the angle not change. It change only if I set value up the max angle setting. I think in bmw the cam exhaust cranck clock, but intake crank clockwise...
AbatelliCristian
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Re: VVT ideas and testers

Post by AbatelliCristian »

In other test I have problem to intake vvt. If I set "advanced" in more duty means, vvt input is ok, but the table timing not work because the shaft cranking opposite. I have try set "retard" in more duty means, but I have vvt2-vvt4 error... not sinc....
In the exhaust vvt is all ok. No sinc error and the table timing work well.
AbatelliCristian
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Re: VVT ideas and testers

Post by AbatelliCristian »

In other test I have problem to intake vvt. If I set "advanced" in more duty means, vvt input is ok, but the table timing not work because the shaft cam rotate opposite. I have try set "retard" in more duty means, but I have vvt2-vvt4 error... not sinc....
In the exhaust vvt is all ok. No sinc error and the table timing work well.
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Re: VVT ideas and testers

Post by jsmcortina »

Can you post your matching MSQ and datalogs for these two settings and I'll have a look.
Have you enabled and do you see the "VVT error" indicators light up ?

James
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AbatelliCristian
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Re: VVT ideas and testers

Post by AbatelliCristian »

Yes, I see the vvt error indicators light up, and I see the angle gauge crazy. This if I set intake retard, but if set advanced is ok, but same times have not sinc at start up and if sinc is ok the table timing not work.
Now I have only datalog for one setting.
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Re: VVT ideas and testers

Post by jsmcortina »

On the two channels you are having problems with have you tried setting the min/max angles both to zero and see what range of reported angles you get with the altered direction setting?

James
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AbatelliCristian
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Re: VVT ideas and testers

Post by AbatelliCristian »

Yes, I have tried to setting min/max=0 , but when I have altered direction vvt not sync and I don't see the angle cam because the gauge is crazy and I see the vvt error indicators light up....
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Re: VVT ideas and testers

Post by jsmcortina »

VVT error isn't checked for when min/max are set to zero.
The direction should have no impact on the angle detection - only on the output duty.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
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prof315
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Re: VVT ideas and testers

Post by prof315 »

Time for another update/progress report on my attempt at (mis)using the very primitive VVT system on a VW 1.8T. I've got the PID dialed in pretty well and I'm staying within a 2 degrees or so of my target. The car definately likes what I'm doing. I don't have power and torque curves but rather plateaus that last 1500 (peak HP) and 3000(peak torque) rpms. Evenually I'll find a spare VVT solenoid/chain tensioner assembly to take apart and play with, then maybe I will be able to hit the target a little closer. This is using the alpha 10a code.
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