O2 sensor signal for A/F ratio - higher values indicate more rich. Boost pressure. Air flow from AFM - lower values indicate more airflow.

Transcription

1 The objective was to design a way to monitor various engine parameters and log them using a serial port to a laptop or other serial device. This was attempted before using an 8051 type board. See ECU project. Using an inexpensive BasicX chip from netmedia the design was more straight forward. The following parameters are currently monitored directly from the ECU: O2 sensor signal for A/F ratio higher values indicate more rich. Boost pressure. Air flow from AFM lower values indicate more airflow. Throttle position. RPM. In addition, temperature sensors were added inside the intake pipes before and after the intercooler to measure the intercooler's efficiency. 1 / 9

2 The data can then be logged to a serial port at the rate of approximately 20 samples per second. RPM is currently only measured once every second. The BasicX chip was soldered onto a board, and along with peripheral components, was mounted in a box. Snap connectors were used for the prototype version. Future versions (if any) will use a 15pin connector. It is also possible to connect this board up to a display. The display used was the 'very smart display module' from simmetry.co m. This module has since stopped working, and I'm looking into a different display to use. 2 / 9

3 then Here (yellow turbocharger see it The intercooler, are is Plots PT Although is since upgraded all 'off the following formula imported are were shown scale' line) data it some not is taken and currently when for this shown, CT26. with data into preliminary producing intercooler AI the way. running the full Excel is was same O2, after only The throttle temperatures. Also taken and airflow, 17psi measured boost. Greddy intercooler time efficiency results. it stripped during is interval. first of difficult and Sorry IC boost As applied, a once is has The temperature. boost down short can (BIAI)/(BIOut) for to Notice with replaced outside see such be were to 25 then a second. seen T04E50 minute also large also slowly temperature just efficiency the The the how images, measured. the stock drive. where intercooler following drops compressor choppy 'interesting' unit. The BI but was the this the three data it longer efficiency graph before 82 is RPM trim, points. easier degrees was graphs since the rises to F. 3 / 9

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7 The temperature sensors were mounted into the intake pipes (click to enlarge) using JB weld. Pictures of the prototype board: 7 / 9

8 In for made, additional of Update variable reluctance board along tested yet, position. plan will wire the data but is use with last board) to wrapping. have (10/23/2003) logging, The determine a (8) picture necessary sensor 15 contains used components pin and above The connector amplifier these speed caps those 2nd speed the 4 chips for pin and by picture from snap components. to filtering sensing reading PC with neaten resistors national plugs power above much the added, up are connector semiconductor is input success stock the add a for prior but design signals. sensor the speed not board for capability is and tested for reading connections sensors The (samples which the a PCB yet. first display for position used doesn't measuring picture board The available!) and module. for LM1815N sensors will contain power, the above be speed. ABS. was If used (the for some another adaptive added camshaft 9 bottom instead I pin have necessary iserial to not theis Another plot of the intercooler efficiency over a 20 minute period. You can get a good idea of how long it takes the intercooler to recover. 8 / 9

9 Excel spreadsheet including all data from this run can be downloaded here (zip format). 9 / 9