injection timing

[Orin Eman]

> Anyone ever consider adding a feedback system to CIS other than
> KE-jetronic's (frequency valve ) ???  (trick is to modulate "control
> pressure", (formerly from the warm up regulator,  why not put in a
> variable valve to control pressure in the circuit to give  closed loop
> fuel delivery ?

Only the earlier K-Lambda systems used the frequency valves.  The later
CIS systems used a a differential pressure regulator which was essentially
a valve as you describe.

As far as I remember, the later systems didn't have the warmup/control pressure
regulator and it was all electronically controlled thru the differential
pressure regulator.

The differential pressure regulator regulated the pressure difference between
the upper and lower chambers in the CIS metering head.  The pressure difference
depends on the current thru the regulator - you would set it for a certain
current at idle.  Sounds pretty much what you are describing!

Orin.