Re: expecting the worst - lean AFR
I actually used a fuel pressure regulator to build an analog pressure controller, that was controllable.
The initial setting was variable and provided the following pressure signal out to " boost compensate the rail pressure" I did not want to connect the boost to the regulator because if the idle pressure was say 60 psig, at 5 psi boost Id get 65, and at 10 pounds of boost Id get 70 psi. This will simply drown the engine in fuel.
The regulator was cross coupled to provide the following output response, and Iam kinda proud as I have never seen a regulator setup like this before. I have over a dozen patents and if there was an use, this could be good for another - simply dont see a need what with digital contols.
Rail pressure // Boost PSIG // regulator output // Rail pressure modified
60 / 0 / 0 / 60
60 / 2 / 0 / 60
60 / 4 / 0 / 60
....../...
ditto
60 / 14 / 0 / 60
60 / 15 / 1 / 61
60 / 16 / 2 / 62
60 / 18 / 3 / 63
60 / 19 / 4 / 64
and on and on and on. NOTE THE NUMBERS DONT LINE UP DUE TO THE WORD PROCESSOR, YOU HAVE TO READ THE TOP LINE AND SEE THE COLUMN OF NUMBERS THAT MATCH UP TO IT. TABS DONT WORK HERE, grrrreeeee
As you can see the cut in prevents and output signal till some adjustable set point - the example above the cut in was set for 14 psig of boost. Above this setting I modify the rail pressure to elevate the pressure 1 psig per psig of boost ABOVE the set point ( here 14 psig as an example ). Kinda need to allow the open loop of the car to keep the lean effect at bay, and since the cut in is adjustable you make it what you want , even the STOCK fuel regulator under the passenger seat has a pressure fitting to allow this to work. Currently the stock fuel regulator is connected to a vent pipe for atmospheric pressure.
Enjoy the weekend, best wishes to the Jersey and New york area people. Woody