injector drivers

[Jemison Richard]

John,

How about some details of your design - maybe some parameters, example maps?
Also, the ignition system.  Are you able to advance completely
electronically or do you still depend on a mechanical advance system - to
any extent?   Catch me offline if you'd rather.   Sounds great!

rick
jemisonr at tce.com

> -----Original Message-----
> From:	John Dammeyer [SMTP:johnd at autoartisans.com]
> Sent:	Sunday, March 07, 1999 3:59 PM
> To:	diy_efi at efi332.eng.ohio-state.edu
> Subject:	Re: injector drivers
> 
> Hi All,
> 
> I'm building a ignition/injection system for a Honda 1595 CC engine.  So
> far the CD ignition works great as do all the appropriate sensors like
> the MAP/Air Temperature etc.  I'm wondering how to go about handling the
> Throttle Position Sensor.
> 
> ie:  While the engine is in a steady state condition the combination of
> MAP and Barometric Pressure sensors along with RPM determine the initial
> injector pulse width.  The O2 sensor closes the loop.  Now if the
> throttle is opened suddenly I know I need to increase the pulse width.
> 
> I can:
> 
> 1)  just use a timer to increase the mixture to 10:1 for a preprogrammed
> time.  This simulates the accelerator pump on a carburated engine.
> 
> 2)  Increase the mixture to 10:1 until the ratio between MAP and
> Barometer reach some set point.
> 
> 3) Do both.
> 
> What I don't want happening is a too rich mixture once the throttle is
> wide open and the engine is loaded at some RPM that no longer increases.
> 
> Would I be best to use the rate of change of the RPM as an indicator to
> back off on the Pulse Width?
> 
> What do the commercial injection systems do?
> 
> Comments?
> 
> Thanks,
> 
> John