In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Frame wrote:

Hi,  I am an engineer and have been involved in Engine Performance Development at both Ford and Chrysler Corp for more years than I care to mention.  This work has keep me involved with many different type of engine controllers and strategys.  I think your project will be awsome, making a controller from the SX chip, great project.  Certianly, using a Speed-Density system approach will be the most stable.  

MFR air = Density * (Volume Flow Rate)* VE

MFR fuel= MFR air/(A/F)

Volume Flow Rate can be calculated from the engine displacement and the RPM.

So, the requred PW is determined from the fuel mass.

Remember, the MAP sensor requires a small orfice (~0.020" to 0.035") to damp out the dynamic pulsations that are present in any intake system, especially at higher loads and RPM's. Also VE (Volumetric Efficiency) can be estimated, for a first cut try 0.90.  The only other thing I would mention here is that to drive a ignition coil primary voltages can be very high ~ 500 V and we usually use a IGBT to handle this.

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=192262#m193852

Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com

The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)