VEMS Community Forum

Technical => Documents => Topic started by: gunni on December 05, 2014, 05:52:24 PM

Title: Dead time calculator - active spreadsheet
Post by: gunni on December 05, 2014, 05:52:24 PM
Hello guys.

Below is a spreadsheet I wrote to aid in setting up simplifed dead time using VEMS and a running engine.
The important usage is to have low pulsewidth as that is where errors are the largest

i.e dead time
idle is 1ms , dead time is 1ms , opening time is 1ms , total 2ms , 50% is dead time, dead time is a significant part of the total on time,
wot high rpm , dead time is 1ms, opening time is 15ms , total is 16ms , 6.25% is dead time, dead time is far less significant.

Spreadsheet (https://onedrive.live.com/redir?resid=CDCE02FA96C1B409!59868&authkey=!AEm8EQhC06mbw9Y&ithint=file%2cxlsx)
Title: Re: Dead time calculator - active spreadsheet
Post by: fphil on December 05, 2014, 06:34:00 PM
Thanks Gunni, I would check my dead time from your spreadsheet
Philippe
Title: Re: Dead time calculator - active spreadsheet
Post by: gunni on December 05, 2014, 07:39:02 PM
Thanks.

I would like some feedback on this.
Title: Re: Dead time calculator - active spreadsheet
Post by: DevInAz on December 09, 2014, 11:15:32 PM
Gunni,

I've always used the traditional method and seemed to get good results. I switched one car this morning to simplified and used your spreadsheet and all seemed to work out well.

Just as a note for other people, When I switched to simplified all the tables filled in with 4800 or something. To make the car run I adjusted the 12v and 14v down until I got the same Lambda reading as I did before switching the injection method. Those numbers came out to 12v- 448 and 14v- 448. The new numbers came out to 461 and 461, i'll mess with the target table and see if everything follows as it is suppose to.

Devin