Bench racing ecms Even if ya hate 101 please read

[garfield at pilgrimhouse.com]

On Thu, 18 Jun 1998 11:39:17 -0700, "richard vandervoort"
<fastski at mailexcite.com> wrote:

>>Speaking as a "magazine expert" here...  Other people have posted that
>>battery voltage makes a difference to the fuel injector as far as how
>>fast it opens, etc.  So I believe the ECM does have a battery voltage
>>correction for injector on time.

>From my experience working with ABS valves (solenoid) it would seem 
foolish for the injector (solenoid) power to not be regulated.  If it is
regulated there would not be any need to correct for voltage changes in
software.  The time for the plunger to move should be relatively fast
compared to the total on time of the solenoid.  Solenoid valves are
usually rated by an on time, flow versus pressure curve, mimimum turn on
voltage(or pressure), and duty cycle.  Flow through the valve is
regulated by power on time.  Using high frequency PWM of voltage the
flow rate through the valve can be partially controlled.  This however
is dependant on plunger and valve seat shapes and may not work very well
since typical injectors are designed for on off operation.

[richard, no word wrap?]

Weeeell, then I guess you're just gonna have to color the auto makers
"foolish", then. On the other hand, to folks where every penny counts
(bean counters abound there, ya know), the cost of regulating a fairly
hefty amount of power, relative to the cost of reading the +BAT voltage
and making a tweak with a few linesOcode, might seem like a pretty
"unfoolish" tradeoff to them guys. Heh.

Gar