FW: Generic PID controller

[Kurt Bilinski]

At 09:05 AM 6/6/97 +0100, you wrote:

>> >I need a generic PID controller which is required to control fuel
>> rail
>> >pressure via a PWM modulated pressure regulator (about 2-3A at 100%).
>> >The input is a 0-5V ratiometric pressure sensor.  It is mobile
>> therefore
>> >needs to be powered by the standard 12V auto electrical system.  The
>> >main requirements (apart from the above) are:
>> 
>> 
>> I think more information is required.  Why not use a mechanical
>> regulator?
>> 
>This is a mechanical regulator in a sense, it's just that the pressure
>set-point is electrically (PWM) modulated, from 0.35 to 12 MPa. (50-1750
>psi).  It's for a gasoline direct injection (GDI) system and is made by
>Bosch.  (Not sure how much Ric)


Does this regulator maintain a setpoint pressure, or is it only a valve.
If it is a real regulator, I don't thing you need the expense of a PID
controller, just a variable duty-cycle oscillator, maybe a 555 circuit.
Either you or an electrical buddy could make one relatively easy.

Kurt