Low PW Compensation

Questions about the Elite Software Programmer? Ask here.
Flat_Rate
Posts: 99
Joined: Wed Jan 20, 2010 12:57 pm

Re: Low PW Compensation

Postby Flat_Rate » Sat Nov 24, 2018 11:57 am

all these updates and still??

User avatar
blakebonkofsky
Posts: 252
Joined: Sun Aug 02, 2015 2:58 am

Re: Low PW Compensation

Postby blakebonkofsky » Sat Nov 24, 2018 6:49 pm

It was added in 2.27 FW and above, 3 months ago. You just need to update and enable the feature.

JimKden
Posts: 408
Joined: Wed Jan 12, 2011 3:28 am

Re: Low PW Compensation

Postby JimKden » Sun Nov 25, 2018 1:38 am

blakebonkofsky wrote:It was added in 2.27 FW and above, 3 months ago. You just need to update and enable the feature.

Where is it located in ESP? I have 2.27 FW installed and 2.00.35 ESP, can't locate it.

User avatar
blakebonkofsky
Posts: 252
Joined: Sun Aug 02, 2015 2:58 am

Re: Low PW Compensation

Postby blakebonkofsky » Sun Nov 25, 2018 6:01 am

JimKden wrote:
blakebonkofsky wrote:It was added in 2.27 FW and above, 3 months ago. You just need to update and enable the feature.

Where is it located in ESP? I have 2.27 FW installed and 2.00.35 ESP, can't locate it.


Main Setup under the Fuel tab. I believe it's called "Short Pulse Width Adder" or something like that.

JimKden
Posts: 408
Joined: Wed Jan 12, 2011 3:28 am

Re: Low PW Compensation

Postby JimKden » Sun Nov 25, 2018 6:38 am

Thank you. I am sure I looked for it, must have had my eyes closed!

Flat_Rate
Posts: 99
Joined: Wed Jan 20, 2010 12:57 pm

Re: Low PW Compensation

Postby Flat_Rate » Tue Dec 04, 2018 10:47 am

Am i not understanding this correctly??

The info i have from Injector dynamics is in MS vs a Percentage

Haltech table is MS vs MS it appears...

Any clues to how to change this up or convert the data to work with haltech?

Flat_Rate
Posts: 99
Joined: Wed Jan 20, 2010 12:57 pm

Re: Low PW Compensation

Postby Flat_Rate » Fri Dec 07, 2018 10:34 pm

Would it be correct to assume that its a percentage correction of time and not flow??

so say at .200MS its adding 88% ( like showed in OP)

so to convert to time would be .376MS?

User avatar
HaltechMatthew
Haltech Staff
Posts: 2666
Joined: Tue Feb 07, 2012 12:45 pm
Location: Sydney, Australia
Contact:

Re: Low PW Compensation

Postby HaltechMatthew » Tue Dec 11, 2018 9:45 am

You cant use percentage because it is not a percentage you are correcting for it is an accrued amount of full open flow injection time. Their data is not so useable in that format. At best you could say it is a percentage of that commanded injection time, do the sums, and enter that corrected injection time amount under that value.

To explain short pulse width correction in short, you are commanding a certain amount of fuel on the basis that the world is perfect. In reality the injectors do not crack open instantly. As the pintle begins moving some fuel flows between when you start to open and it opens fully, and when it starts to close and it closes fully and this is of course non-linear at not the true full open amount of flow. If we are commanding a very small amount of injection time that is lets say equal to this amount of time to open and close you obviously did not get the amount of fuel you asked for, you got much less because it is not in open flow. So this is what the table is for, to correct for the amount of time to compensate for the opening and closing of the injector when it is not linear in flow. Truth is this in in effect all of the time even it high injection time, just the amount if almost inconsequential to the tune.

The bigger question is how you find this data. The even shorter answer is you cant. Without having a flow test machine to measure it you are only guessing, but by guessing you will already get it closer to ideal operation than doing nothing at all.

So, fake it until you make it.

Flat_Rate
Posts: 99
Joined: Wed Jan 20, 2010 12:57 pm

Re: Low PW Compensation

Postby Flat_Rate » Mon Dec 17, 2018 2:55 pm

Talking to your tech support on the phone, they had suggested to use a generic fuel correction table with the effective pulse width as the axis and input the data that way..

I can tell you that it ran absolutely terrible this way..

i will do the math and add/subtract the percentage from the pulsewidth times given and see how that works.

JimKden
Posts: 408
Joined: Wed Jan 12, 2011 3:28 am

Re: Low PW Compensation

Postby JimKden » Wed Dec 19, 2018 10:40 am

If anyone is using the ID 725 injectors, the attached file was sent to me from ID. This is not on the ID website. I requested the info and they developed the numbers. The file may not make it to their website because the ID725 is no longer being sold and other info for them is not found anymore.
Attachments
ID725- Haltech Elite Characterization Tables.xls
(431 KiB) Downloaded 9 times

Flat_Rate
Posts: 99
Joined: Wed Jan 20, 2010 12:57 pm

Re: Low PW Compensation

Postby Flat_Rate » Thu Dec 20, 2018 12:31 am

JimKden wrote:If anyone is using the ID 725 injectors, the attached file was sent to me from ID. This is not on the ID website. I requested the info and they developed the numbers. The file may not make it to their website because the ID725 is no longer being sold and other info for them is not found anymore.


so have you used this data?

I assume you are having to convert the percentage to a time as well?

JimKden
Posts: 408
Joined: Wed Jan 12, 2011 3:28 am

Re: Low PW Compensation

Postby JimKden » Thu Dec 20, 2018 1:33 am

Not used yet, it came in yesterday. I need to review the discussion above. It looks to be in the same format as for the larger injectors.

JimKden
Posts: 408
Joined: Wed Jan 12, 2011 3:28 am

Re: Low PW Compensation

Postby JimKden » Tue Jan 01, 2019 7:24 am

I see the latest firmware/software now has "effective pulse width" parameter, so the data from ID should be able to be used. The fuel pressures in the id data though are the differential pressure across the injector.

Flat_Rate
Posts: 99
Joined: Wed Jan 20, 2010 12:57 pm

Re: Low PW Compensation

Postby Flat_Rate » Thu Jan 03, 2019 11:30 am

JimKden wrote:I see the latest firmware/software now has "effective pulse width" parameter, so the data from ID should be able to be used. The fuel pressures in the id data though are the differential pressure across the injector.


The fuel pressures are there for the different voltage offsets??

The values for the low pulse width are a percentage of time..

Not sure i follow what you are saying

JimKden
Posts: 408
Joined: Wed Jan 12, 2011 3:28 am

Re: Low PW Compensation

Postby JimKden » Thu Jan 03, 2019 1:04 pm

The fuel pressure given by ID is the differential pressure across the injector, not the absolute fuel pressure given ESP. Because the table in ESP does not have a second axis available, I used a row of voltage values where I most often operate. I interpolated for a set of values to a diffewrential pressure I see at low loads. That's the close as I could see to obtain at present. You'll need to run a spreadsheet to find the time to add. Not saying this is the best but it is as I see it for now.


Return to “Elite Software Programmer (ESP)”

Who is online

Users browsing this forum: No registered users and 1 guest