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Title: Help with turbo DC tables Post by: Billy on December 01, 2014, 05:01:48 AM Hi, could someone explain in simple terms, the turbo DC tables?
Does it look at KFLDIMX first to determine atmospheric pressure and use that result in KFLDRL to determine actual DC to the solonoid? Title: Re: Help with turbo DC tables Post by: nyet on December 01, 2014, 01:38:13 PM http://s4wiki.com/wiki/Tuning#Boost
Title: Re: Help with turbo DC tables Post by: Billy on December 17, 2014, 05:13:04 AM Ok, I've been reading and reading about this and still struggling.
Can anyone confirm the x axis in KFLDIMX, is it boost pressure or atmospheric pressure? Title: Re: Help with turbo DC tables Post by: aef on December 17, 2014, 05:29:06 AM http://nefariousmotorsports.com/forum/index.php?topic=3280.msg33071#msg33071
Title: Re: Help with turbo DC tables Post by: spacey3 on December 17, 2014, 05:42:23 AM Ok, I've been reading and reading about this and still struggling. Can anyone confirm the x axis in KFLDIMX, is it boost pressure or atmospheric pressure? Think there's lots of information about DC tables. In Nyet's words from this post http://nefariousmotorsports.com/forum/index.php?topic=4084.0 KFLDIMX should be tuned (roughly) to where you think your long term WGDC (pre-linearization) should settle at for a given boost/rpm The x-axis is boost pressure (desired I think) Title: Re: Help with turbo DC tables Post by: Billy on December 17, 2014, 07:59:13 AM Ok so bare with me please.
Am I right in thinking that during spool up only, KFLDIMX is used as an initial duty to quickly reach that pressure? eg at 3000 rpm I wish to request 1000mbar it would apply 75% DC. Then when it has reached that pressure KFLDRL takes over and now the 75% DC becomes 80% DC? Although looking at it now that can't be right?? Title: Re: Help with turbo DC tables Post by: nyet on December 17, 2014, 11:25:24 AM Ok so bare with me please. Am I right in thinking that during spool up only, KFLDIMX is used as an initial duty to quickly reach that pressure? eg at 3000 rpm I wish to request 1000mbar it would apply 75% DC. Then when it has reached that pressure KFLDRL takes over and now the 75% DC becomes 80% DC? Although looking at it now that can't be right?? Not quite. On spool up, most of the DC comes from the P contribution (Q0) because lde is so big. As lde spends time being non-zero, the I contribution builds (Q1) and eventually reaches its maximum value (IMX), so when lde is zero, the P contribution is zero, but the I contribution is at max. Finally, KFLDRL is ALWAYS in effect, and corrects the output of the PID, always. Title: Re: Help with turbo DC tables Post by: Billy on December 18, 2014, 08:39:50 AM Ok, thanks for that, still a bit baffled but little bits are sinking in the more I read
Title: Re: Help with turbo DC tables Post by: Lost on December 18, 2014, 08:57:56 AM Ok, thanks for that, still a bit baffled but little bits are sinking in the more I read I think Nyet explained It pretty simple for you. Now, open your TP or OlS, take a look at those maps Nyet suggested and try too make sense of it. Title: Re: Help with turbo DC tables Post by: Billy on December 19, 2014, 02:57:08 AM It might be simple for some. I'll keep chewing at it.
Title: Re: Help with turbo DC tables Post by: nyet on December 19, 2014, 09:37:05 AM It might be simple for some. I'll keep chewing at it. You'll probably want to do some independent reading on PIDs. It is a very complex topic. |