DIYEFI.org Forum

toc wrote:Subver,
Thanks for the schem.
That format of schematic is difficult for me to read though

This is russian state standart format, GOST
FETs driven by MCU, pin configured as active output.

This is my schematic of WBO controller. without pc interface. The main feature is Pump cell drive method. I pump constant current in and out cell, then measure duty cycle of pulses, it gives me medium current value, and lamba calculated from look-up table of sensor's datasheet. There is setup photo ...

Okay, i have found a bug in my mcu firmware, now my controller shows right values for AFR. How it works: 1. Standart heater control with MOSFET and PID regulator. Resistance of nernst cell is measured by pulsing AC coupled signal to cell, than amplifier and peak detector used to measure level of pul...

Hi All, I have reassemble my LSU 4.9 controller and have tested it on car. And i have strange results. I put sensor deep inside exhaust tailpipe of my 06MY Subaru forester, warmed up engine and see measurements while engine idling. On OBDII Scanner mixture shows lambda 1.0 (AFR is 14.7), but my cont...

Ok, thank you. Now i have some understanding of processes running in wbo ))
However, i've replaced my pump drive VOLTAGE source with CURRENT source and get much,much smooth operation near stoich point of mixture )

Hi All, I'm developming my own bosch lsu controller and i have some "problems" :) My circuit is similar to that posted on first page, i have an "virtual ground" point at 2.5V and an amplifier of pump cell current sensing resistor (62 Ohms). When i run test for first time, i've go...