Mag00
New Member
Hi Ya'll, I was referred here by #12 at all about circuits.
I have a basic understanding of electronics.
The challenge is to take a tachometer signal and tie it to a variable resistance to alter a lambda sensor output going to a computer (ECU).
I am in the discovery phase, (just starting LOL) and do not know what semiconductor or IC chip or arrangement of electronic components can do the job.
The RPM needs to be read without bleeding much power off the wires running to the coil. I have taps on the wires for a dyno rpm reading.
The engine runs lean at low rpm, and rich at high rpm. The lambda (02 sensor) sends a voltage signal to the ecu to correct to predetermined specs residing in the ecu. If I can change the resistance, thus changing the voltage in proportion to RPM, I think I can have a good solution. I may be able to use an on/off type setup, that cuts on or off at a selected rpm.
Unfortunately nobody has been able to crack into the ecu and upload new fuel and ignition maps, so a piggy back fix is the next best thing to a real programming solution.
What semi conductor should I be looking at, or do I need to design something to do the job using transistors and other hardware? Been 30 years since I took electronics, maybe I need to crack a book again.
Any suggestions will be appreciated.
Dave
I have a basic understanding of electronics.
The challenge is to take a tachometer signal and tie it to a variable resistance to alter a lambda sensor output going to a computer (ECU).
I am in the discovery phase, (just starting LOL) and do not know what semiconductor or IC chip or arrangement of electronic components can do the job.
The RPM needs to be read without bleeding much power off the wires running to the coil. I have taps on the wires for a dyno rpm reading.
The engine runs lean at low rpm, and rich at high rpm. The lambda (02 sensor) sends a voltage signal to the ecu to correct to predetermined specs residing in the ecu. If I can change the resistance, thus changing the voltage in proportion to RPM, I think I can have a good solution. I may be able to use an on/off type setup, that cuts on or off at a selected rpm.
Unfortunately nobody has been able to crack into the ecu and upload new fuel and ignition maps, so a piggy back fix is the next best thing to a real programming solution.
What semi conductor should I be looking at, or do I need to design something to do the job using transistors and other hardware? Been 30 years since I took electronics, maybe I need to crack a book again.
Any suggestions will be appreciated.
Dave