audi 1.8t idle valve

http://jbperf.com/pwm_converter/index.html

audi 1.8t idle valve

Postby juansh2385 » Sun Feb 03, 2013 9:37 pm

HI Jean I am trying to take control of and 1.8t audi idle in this case there is no valve in the car the throttle have and electric motor apparently pwm that opens the plate and make the car idle. I am planing on using one of your pwm converter to amplify the ms pwm signal.
I was wondering are you aware if anybody have any type of success with this that i want to do?

Juan
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Re: audi 1.8t idle valve

Postby jbelanger » Sun Feb 03, 2013 9:57 pm

I'm not aware of anyone having used the board this way. So I don't know how well it will work.

Jean
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Re: audi 1.8t idle valve

Postby juansh2385 » Sun Feb 03, 2013 10:14 pm

Well I analyze the stock signal and is about 500hz but ms2 idle control is not really happy with that kind of frequency I am willing to try the board is not that expensive :D .

I think you will receive the order this week is it 26 usd ship to puerto rico too?

any ways I'll keep you updated.

Juan
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Re: audi 1.8t idle valve

Postby jbelanger » Sun Feb 03, 2013 10:17 pm

Shipping cost to Puerto Rico is the same as for the rest of the US. So it's $24 total.

And let me know how it goes.

Jean
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Re: audi 1.8t idle valve

Postby juansh2385 » Tue Feb 12, 2013 9:07 pm

I have a silly question jean in the picture of your page that explains what jumper I need to made to select the multiplier where is located the cpu in that picture left or right? I am having trouble selecting the right jumpers because I can not know what reference I can use to know the position that the pwm converter board should be in order to match the photos.

Juan
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Re: audi 1.8t idle valve

Postby jbelanger » Tue Feb 12, 2013 9:34 pm

It's the same direction as this:

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So the CPU is on the left side which means the multiply by 4 would be the jumper at the top in this picture.

Jean
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Re: audi 1.8t idle valve

Postby juansh2385 » Tue Feb 12, 2013 10:18 pm

ok thanks
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Re: audi 1.8t idle valve

Postby juansh2385 » Tue Feb 12, 2013 10:21 pm

Quick reply as always great support. May I suggest that you should clarify this in the page. I am not sure if I am the only one with the doubt but I think is a good idea to clarify.
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Re: audi 1.8t idle valve

Postby juansh2385 » Wed Feb 13, 2013 7:29 am

Last Question I hope. I am going to use Fidle as the in pin. Where do I take the signal of the cpu before (directly to cpu pin) or after R19?
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Re: audi 1.8t idle valve

Postby jbelanger » Wed Feb 13, 2013 11:16 am

You can take the signal directly from the CPU but after R19 would also work.

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Re: audi 1.8t idle valve

Postby juansh2385 » Thu Feb 14, 2013 12:15 am

what is the maximum output frequency recommended for the valve?
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Re: audi 1.8t idle valve

Postby jbelanger » Thu Feb 14, 2013 12:35 am

I don't know. You will have to ask people familiar with the Audi products.

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Re: audi 1.8t idle valve

Postby juansh2385 » Thu Feb 14, 2013 1:44 am

sorry did not express that question correctly. I meant what the maximum recommend en valve output frequency from the board. at 500hz is still buzing and i have no control over it
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Re: audi 1.8t idle valve

Postby jbelanger » Thu Feb 14, 2013 1:55 am

You can easily go much higher than that. You can go up to about 20kHz if needed but that depends on the input frequency. I'm not sure which multiplier you're using currently but you can try the next one or the even higher if you need.

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Re: audi 1.8t idle valve

Postby juansh2385 » Thu Feb 14, 2013 10:32 pm

Hi Jean reporting back as promise first even though the factory pc controls this valve at 500hz i could only make it stop homing 15616hz I use 256 jumper and a 61 frequency from the ms. Now some bad News I know you recommend using 12v from the battery but I didn't have spare pins so I use s12 spot in the v3 board where the fly back diode from the normal pwm mod is recommended in the manual. At first it smoke the traces from d10 to the regulator I did not know why made a jumper then I smoke c14... then I connected the 12v directly to the battery and no more smoke to report so in this install It is a must to connected the 12v of your board to the battery.

Now I am playing with the throttler in the bench I have manage to make is open and close this valve is weird it only close at 0 dc and with my settings it start to open at 24 dc up to 32(full open) the only problem is that after the valve opens it does not close at all until the code reach around 0dc so if it open at 27 and I want to go down to 24 the valve have to go to 0 dc and then open until 24 as you can imagine this is a great inconvenience for the ms algorithm. I think I am going to need custom code to drive this valve correctly. ( The oem have another aproach witch invert the polarity of the cables to close the valve and revert to maintain the new position really fast)

the code needs command 0 dc the instant it needs to close the valve then as soon as the rpm goes down maybe look into a table that can be use for reference for a quick opening and then slowly increasing dc until it is at the desire rpm. a dead rage also might be necessary.
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Re: audi 1.8t idle valve

Postby jbelanger » Thu Feb 14, 2013 10:54 pm

Were you using S12 or S12C? Using S12 should have worked because it is connected directly to the battery. However, using S12C will not work because of D10 which prevents any flyback from going back to the battery.

As for the code, you'll need to ask on the msextra forum about a code change for the MS because the CPU on the converter board doesn't have the resources for it.

Jean
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Re: audi 1.8t idle valve

Postby juansh2385 » Thu Feb 14, 2013 11:32 pm

yes I installed s12 the one that is beside r57 trust me it did not work. As for the code I expected that much do not worry I was reporting back as promise.

Juan
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Re: audi 1.8t idle valve

Postby juansh2385 » Tue Feb 19, 2013 8:48 am

Jean is official I made it functional with you board but is far from optimal. I improve the result hacking a little bit the code. I not sure if you knew but the reason that it did not work as intended is because the throttler plate is controlled by a servo motor. I am going to take the idea of another ms member in the forum to control the throttler trough a custom interface that convert the pwm signal to a analog v (0-5) compare it with a small tps that the valve have for idle position and drive the servo trough a H brige servo driver.

Juan
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