I have a car that runs a bosch motronic fuel injection ECU system. It's a pretty neat system and I am focussed on understanding/adapting one certain aspect of it that relates to measuring the exhaust temperature.
The system utilizes a k-type thermocuple probe. This probe connects into a blackbox device that interprets the temperature and then sends out a signal to the ECU. based on my service manual, if the temp is 920 the blackbox sends out 0vdc to the ECU, it temp rises above 960 degrees the blackbox sends out 13vdc to the ECU. below 920 the I am not sure what the signal is (if there is one), however below 920 the system interprets this as a state in which the exhaust is at an okay temperature.
Also, the higher temperatures there is also a signal to the dash panel to illuminate a bulb to tell the driver there is a problem.
So, I think I can make use of the AD595 IC, but am not sure how to switch from 0vds to 13dc and not sure what goes on when the temp is below 920.
Any help would be greatly appreciated. thx, Marc
The system utilizes a k-type thermocuple probe. This probe connects into a blackbox device that interprets the temperature and then sends out a signal to the ECU. based on my service manual, if the temp is 920 the blackbox sends out 0vdc to the ECU, it temp rises above 960 degrees the blackbox sends out 13vdc to the ECU. below 920 the I am not sure what the signal is (if there is one), however below 920 the system interprets this as a state in which the exhaust is at an okay temperature.
Also, the higher temperatures there is also a signal to the dash panel to illuminate a bulb to tell the driver there is a problem.
So, I think I can make use of the AD595 IC, but am not sure how to switch from 0vds to 13dc and not sure what goes on when the temp is below 920.
Any help would be greatly appreciated. thx, Marc