injector drivers

[Bruce Plecan]

-----Original Message-----
From: John Dammeyer <johnd at autoartisans.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Sunday, March 07, 1999 4:52 PM
Subject: Re: injector drivers


Delta TPS, and Delta MAP, both corrected by coolant temp., are common.
Bruce

>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
>