еще тут
http://wbo2.com/faqs/autronic.htm
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Issues in Using the 1 Volt Autronic Input
OK, you have a Tech Edge wideband controller with a differential 0-5 Volt output(*1). How best to connect it to your Autronic ECU to use their Autotune function? There are some issues to address, and we have solutions too:
- Autronic ECUs use a 0 to 1 volt input signal. Tech Edge controllers provide a 0 to 5 Volt signal. Although you can re-program the controller output to 0-1 Volt, it's better to divide 0-5 Volts down to 0-1 Volts. This improves the dynamic range by a factor of 5 and gives more precise, smaller steps.
- The Autronic default 10 to 30 AFR range (assuming AFR(stoich) = 14.7) means just a quarter of this range, from AFR = 10 to 15, is in the effective tuning range. If we limit the AFR from 10 to 20, half the default, this gives us twice the dynamic range. This and the previous item gives us 10 times the dynamic range of a simplistic approach. The output setup is shown in the image at right - note the lower line sloping upwards; the leftmost darker section is between 0 and 0.5 Volts, but you can see that over the 10 to 30 AFR range the output (grey line) would go between 0 and 1 Volt.
- [*]Electrical Noise is a fact of life in automotive applications. Lambda sensor controllers precisely heat the sensor to high temperature using large currents switched electronically. This can introduce noise in the ground return of the controller itself. Most Tech Edge controllers have a WBlin+/- output (we call it a differential output) feature that's designed to allow for small varying differences in ground voltages between the controller and the ECU. Enabling this feature may require changing/removing a jumper inside the case of your controller and then ensuring you connect both the WBlin+ and the WBlin- connections to the ECU.
--- смотрите миниатюру 1
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0→5 Volt & 10→20 AFR ⇒ 10:1 Resistive Divider
he best way to connect your Tech Edge unit to an Autronic ECU is with a 10:1 resistive divider. We suggest you use 1% resistors of value 2k and 18k wired as shown at right.
Note that there are 4 connection points:
specially programmed 0-5 Volts
WBlin+ output from the Tech Edge wideband controller.
Ground reference
WBlin- input to counteract ground noise and voltage offsets.
Divided
Aut-in input to Autronic ECU - connect to 1 Volt oxygen sensor input.
The Autronic ground point
Aut-Gnd - either the oxygen sensor input GND point or the ECU's analogue GND.
--- смотрите миниатюру 2
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