Im trying to figure out how to make a circuit that takes an negative injector pulse (0-16ms from a car engine) and converts it to a 0 to +7v signal for the vehicle consumption indicator to monitor. It would have to be adjustable because the injectors will be 3 times the size of the stock injectors. It would have to have very high impedance to not screw up the injectors pulse. Injectors are normally between 1 and 16 ohms.
I will be logging the injector pulse and 0-7v signal with an oscilloscope to get the calibration soon. It should be a straight line. The older cars used an airflow plate with a 4k
hm: position sensor (part of the mechanical fuel injection) to give the 0-7v signal to the consumption indicator with this curve.
**broken link removed**
I believe the curve should actually be linear to the injector pulse because the airflow plate looks like this ( The voltage curve almost fits the contour of the "bowl")
**broken link removed**
The airflow past the plate has to be linear to supply the correct amount of fuel to the incoming air.
This circuit is built into the stock computer. Problem is i am installing a standalone fuel and ignition computer so i can tune the car. Losing this functionality sounds dumb but is a helpful thing to have.
I was thinking of using a CD4066 chip but im not very good with circuit design yet.
Anyone have any ideas how to do this?
I will be logging the injector pulse and 0-7v signal with an oscilloscope to get the calibration soon. It should be a straight line. The older cars used an airflow plate with a 4k
hm: position sensor (part of the mechanical fuel injection) to give the 0-7v signal to the consumption indicator with this curve. **broken link removed**
I believe the curve should actually be linear to the injector pulse because the airflow plate looks like this ( The voltage curve almost fits the contour of the "bowl")
**broken link removed**
The airflow past the plate has to be linear to supply the correct amount of fuel to the incoming air.
This circuit is built into the stock computer. Problem is i am installing a standalone fuel and ignition computer so i can tune the car. Losing this functionality sounds dumb but is a helpful thing to have.
I was thinking of using a CD4066 chip but im not very good with circuit design yet.
Anyone have any ideas how to do this?
