Lambda Valve

[Clarence L.Snyder]

Robert Harris wrote:
> 
> Before anyone else runs off into fantasy land, it might help to know what a
> "Lambda Valve" is.   What it most definitely is not is a Fuel Pressure
> Regulator in any classical sense.
SNIPP
>   It looks similar to a Fuel Injector but its not.  It opens and >closes in a similar manner, but its opening and closing do not meter >fuel. 
Whoa!! Hold on there!
How does it  control the pressure on the lower chanber? The fuel is fed
to that chamber through a calibrated orifice, which allows only so much
fuel through - but much more than is required. This extra fuel is
"injected" back into the return line, limiting the control pressure
(lower side of the chanber) which controls injection volume / pressure.
So in operation, it IS a pressure regulator. The same type of setup CAN
be used as an EFI pressure regulator. Regulate the flow into the FI log
with  a restrictor (OK, just use the fuel line if you want) that allows
more fuel into the log than the injectors will ever need to pass. This
builds pressure. Limit the pressure by "injecting: it back into the
return line. Control the "injection" with a PWM and pressure sensor. If
you want to get fancy you "restrict" the FI feed by slowing the pump
with another PWM, based on power requirement (read MAP sensor). The fuel
pump always needs to deliver some excess volume (to build pressure)
which is the regulated by the "injector" in the return line. The MAP
sensor can compensate for boost as well - by raising fuel pump output
and providing an "add" to the fuel pressure control, lowering the pulse
width or frequency of the "regulator injector". By matching the fuel
pump speed and injector capacity, a fairly small injector, running at
the middle of it's range, should be able to provide exceptionally fine
fuel pressure control.Mabee even a "lambda valve".
> Rather the amount of
> time the valve remains open - bleeding control fuel back to the tank -
> controls the pressure in the lower chambers of the differential pressure
> valves.  This in turn, changes upper chamber pressure to change the pressure
> drop and change enrichment.
> 
> Simple terms - its a solenoid valve - pure plain and simple. 

And what is an injector?


> Its on time is
> determined by the pulse width.  Open Closed.   That's it that's all there is.
> 
> But - it can be used for anything you want.  A Frequency/Pulse width modulated
> valve that can handle up to about 100 PSI.   Think about it - you might come
> up with a dark side idea.
> 
> 1963 Ford C-600 Prison Bus Conversion "Home"
> 1971 Lincoln Continental 460 "Christine"
> 1972 "Whale" Mustang awaiting transplant
> 1978 Dodge Long Bed Peeek Up "Bundymobile"
> 
> Habaneros - not just for breakfast anymore