Boost controller duty cycle
12 August 2003, 12:22 PM
#1
Scooby Newbie
Thread Starter
Join Date: Jul 2003
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
Hi!
Does anyone have / know and wish to share
boost valve duty cycle table?
Also whats the correct PWM frequency for duty cycle valve?
My controller hardware is ready, programming the software right now. Total cost about 10 £ using PIC controller and Subarus own valve.
Thanks
Illimar
Does anyone have / know and wish to share
boost valve duty cycle table?
Also whats the correct PWM frequency for duty cycle valve?
My controller hardware is ready, programming the software right now. Total cost about 10 £ using PIC controller and Subarus own valve.
Thanks
Illimar
08 December 2003, 01:26 PM
#2
Scooby Regular
Join Date: Nov 2000
Location: 32 cylinders and many cats
Posts: 18,658
Likes: 0
Received 1 Like
on
1 Post
http://www.ecutek.co.uk/tuning/oemcompare/
IIRC, I used http://www.scoobynet.co.uk/bbs/threa...ThreadID=66285 about 15 Hz on my DIY EBC - AVR 90S4433 with 8MHz clock, 1024 prescale, 8 bit PWM, TIP12x high side drive.
ECU is about 14 Hz I think.
PI worked well, adding D did not. It needs RPM control to work really well IMHO which I did not get around to. Gear judge would also help - or could scale by rate of change of RPM to maximum duty cycle to give it a lower gear kick but keep the control tight elsewhere without spiking. Self learn would also be a nice feature... and then you'll have an AVC-R
Would be very interested if you were to post circuits and code. I was thick so coded mine in BASIC
[Edited by john banks - 8/12/2003 1:29:11 PM]
IIRC, I used http://www.scoobynet.co.uk/bbs/threa...ThreadID=66285 about 15 Hz on my DIY EBC - AVR 90S4433 with 8MHz clock, 1024 prescale, 8 bit PWM, TIP12x high side drive.
ECU is about 14 Hz I think.
PI worked well, adding D did not. It needs RPM control to work really well IMHO which I did not get around to. Gear judge would also help - or could scale by rate of change of RPM to maximum duty cycle to give it a lower gear kick but keep the control tight elsewhere without spiking. Self learn would also be a nice feature... and then you'll have an AVC-R
Would be very interested if you were to post circuits and code. I was thick so coded mine in BASIC
[Edited by john banks - 8/12/2003 1:29:11 PM]
Thread
Thread Starter
Forum
Replies
Last Post