How Does a Thermocouple Interface with an ECU to Control Fuel Injection?

AI Thread Summary
A thermocouple probe in a Motronic 2.7 fuel injection system sends signals to the ECU based on exhaust temperature. It outputs 0V at 920 degrees Celsius and 13V at temperatures above 980 degrees, while the output below 920 degrees is uncertain, possibly 5V. The user seeks to create a circuit using the AD595 chip to achieve specific voltage outputs based on temperature thresholds. Additionally, they want a separate output to control a dash panel bulb, which should flash above 900 degrees and remain on above 940 degrees. The discussion focuses on how to implement these requirements effectively.
meestahbig
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Hi everyone, please let me know if this posting belongs elsewhere.

I have a car that runs a motronic 2.7 fuel injection system and with that there is a thermocouple probe in the exhaust pipe (standard K-type thermocouple). This thermocouple goes into a black box which then sends out a signal to the fuel injection ECU telling the system how how the exhaust is.

And actually it seems its much simpler than that. It does not tell the fule injection ECU the temperature, what it does is it sends 0v if the temp is 920 degrees and sends 13v if the temp is above 980. I'm not sure what signal it sends if the temp is below 920, maye its 5v.

does anyon know how this would work. could I just the AD595 chip. but how would I get the binary state of 0v or 13v?

any ideas. thx, Big
 
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Here is a little more detail about what I am trying to achieve...

the input is the K-type thermocouple.

This is what I need the circuit to do:

At 980 celcius (+/- 20 degrees), I need it to send 13vdc output. under 980 degrees, the output on this should be 0vdc.

Also, there is another circuit v out that illuminates a small dash panel bulb. above 900 (+/- 20), the bulb should flash. above 940 (+/- 20) the bulb should stay on permanantly.

that's it! LOL.
 

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