Qustions, boost control & Bosch igniton modules.

Fri Apr 20 21:17:39 GMT 2001

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Personally I have found using around a 50ms total PW works with my solenoid
well. I would assume this time will vary with solenoid size and resistance.
The way I do it is to take the total and move towards one end or the other,
PWM. i.e. 20ms on/30ms off, or 5ms on/45ms off. Depending on desired boost.
The tricky part I have found has been finding how often to adjust the value
and how aggressively, But I am playing with a funky turbo that is uh,
somewhat responsive (VNT). I also tried the on/off thing and didn't work for
me either, about 5psi bounce around the target, car actually went ,chirp,
chirp, chirp of the tires with every high spike.

Damon Kelley
87 Shadow ES, 13psi, Cold-Air
89 CSX #208, 15.2 at 93
96 CBR600F3, Turbo In Process

> -----Original Message-----
> From: Klas Arvidsson [mailto:saabuel at hotmail.com]
> Sent: Friday, April 20, 2001 1:46 PM
> To: diy_efi at diy-efi.org
> Subject: Qustions, boost control & Bosch igniton modules.
> 
> 
> 
> 
> 
> Hi my name is Klas and I am working on a ignition and fuel 
> injection system 
> based on a pic16f877.
> I tried a simple boost control program working as:
> if boost_over_allowed then
> turn_on_wastegate_valve
> else
> turn_of wastegate_valve
> Now this did not work very vell, the boost is fluctuating 
> about 0.1 bar 
> which makes the car a bit strange to say the least. Now I was 
> thinking of 
> PWM control instead. But what i do not know is what frequency 
> i should use? 
> 40Hz 10Hz ? Higher? Anybody have any ideas?
> My next question is what is inside those little black 7 pin 
> bosch ignition 
> modules (Fitted to many mid 80:s european cars.). Does it 
> incorporate some 
> sort of "smart" dwell circutry or does it only turn on and 
> off the coil?
> 
> klas
> ______________________________________________________________
> ___________
> Get Your Private, Free E-mail from MSN Hotmail at 
http://www.hotmail.com.

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<TITLE>RE: Qustions, boost control &amp; Bosch igniton modules.</TITLE>
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Personally I have found using around a 50ms total PW =
works with my solenoid well. I would assume this time will vary with =
solenoid size and resistance. The way I do it is to take the total and =
move towards one end or the other, PWM. i.e. 20ms on/30ms off, or 5ms =
on/45ms off. Depending on desired boost. The tricky part I have found =
has been finding how often to adjust the value and how aggressively, =
But I am playing with a funky turbo that is uh, somewhat responsive =
(VNT). I also tried the on/off thing and didn't work for me either, =
about 5psi bounce around the target, car actually went ,chirp, chirp, =
chirp of the tires with every high spike.

<P><FONT SIZE=3D2>Damon Kelley</FONT>
<BR><FONT SIZE=3D2>87 Shadow ES, 13psi, Cold-Air</FONT>
<BR><FONT SIZE=3D2>89 CSX #208, 15.2 at 93</FONT>
<BR><FONT SIZE=3D2>96 CBR600F3, Turbo In Process</FONT>
</P>

&gt; -----Original Message-----
 &gt; From: Klas Arvidsson [<A =
HREF=3D"mailto:saabuel at hotmail.com">mailto:saabuel at hotmail.com</A>]</FON=
T>
 &gt; Sent: Friday, April 20, 2001 1:46 PM
 &gt; To: diy_efi at diy-efi.org
 &gt; Subject: Qustions, boost control &amp; Bosch =
igniton modules.
 &gt; 
 &gt; 
 &gt; 
 &gt; 
 &gt; 
 &gt; Hi my name is Klas and I am working on a =
ignition and fuel 
 &gt; injection system 
 &gt; based on a pic16f877.
 &gt; I tried a simple boost control program working =
as:
 &gt; if boost_over_allowed then
 &gt; turn_on_wastegate_valve
 &gt; else
 &gt; turn_of wastegate_valve
 &gt; Now this did not work very vell, the boost is =
fluctuating 
 &gt; about 0.1 bar 
 &gt; which makes the car a bit strange to say the =
least. Now I was 
 &gt; thinking of 
 &gt; PWM control instead. But what i do not know is =
what frequency 
 &gt; i should use? 
 &gt; 40Hz 10Hz ? Higher? Anybody have any =
ideas?
 &gt; My next question is what is inside those little =
black 7 pin 
 &gt; bosch ignition 
 &gt; modules (Fitted to many mid 80:s european =
cars.). Does it 
 &gt; incorporate some 
 &gt; sort of &quot;smart&quot; dwell circutry or =
does it only turn on and 
 &gt; off the coil?
 &gt; 
 &gt; klas
 &gt; =
______________________________________________________________
 &gt; ___________
 &gt; Get Your Private, Free E-mail from MSN Hotmail =
at 
 <A HREF=3D"http://www.hotmail.com" =
TARGET=3D"_blank">http://www.hotmail.com</A>.

<P><FONT =
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<BR><FONT SIZE=3D2>To unsubscribe from diy_efi, send &quot;unsubscribe =
diy_efi&quot; (without the quotes)</FONT>
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</P>

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