Questions....

[Richard N Dabney]

>A few questions to y'all...
>
>1) What are the differences between "peak-n-hold" and
>saturated injectors?  Is it just the coil resistance,
>or is there more.  Why does'nt everyone use the same
>type?

The voltage it takes to pull in an injector is greater than the voltage it
takes to hold it on. A higher voltage limits the on/off frequency of the
injector because of the back-emf generated by the "saturated", then
collapsing flux field when the injector is turned off. So if a higher
pull-in voltage (peak) is used,  then a lower voltage to hold it, the
back-emf is less and the injector can be operated at a higher frequency.
The reason most don't use them is cost.





************================================************
Richard Neill Dabney
Controls Engineer
GM/DOE Fuel Cell Project              Los Alamos National Laboratory
TA-46,WA-128, MS/J-588                Los Alamos,  NM  87545
(505)-667-6086                                Fax (505) 665-6173