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'''Toyota Prius with LPG''' * factory ECU, driving ign and the DBW-throttle (and the gasoline-injectors when switched to gasoline) * piggyback LPG-injector driver * [http://shop.vems.hu/catalog/roundv2wbo2egt-p-166.html VEMS round] for lambda-control feeding voltage signal to the factory ECU's narrowband-lambda input '''Car works like a charm on petrol and LPG'''. LPG with ~1.15 lambda is perfect (decreases pumping losses) * no experience yet with higher, say ~1.23 lambda. ---- '''Trick:''' * '''round's vout (dsub15/pin1) connected to the factory ECU's nernst input''', NBO2 sensor disconnected of course * The '''round's vout_gndref (dsub15/pin9) had to be connected to system-ground (chasses)''' ** The installer originally connected vout_gndref to the lambda-sensor ground, which (surprisingly) measured -0.35V (no mistake, minus !) when operating well ** MAT/CLT/TPS sensor malfunction errors came up in OBD-2 tool when round's gndref was connected to this wire instead of chasses ---- vout_conf=04, and the curve set like: * 0.9V downto 0.76V * '''sudden 0.76V downto 0.16V from 1.1 to 1.2 lambda''' * 0.16V downto 0 The round experimental (cell.dyndns.ws/f/) 1.5.5 firmware (if the 17 point analog-out curve topmost entry is exactly 0.9V which is internally 46: vout_curve=2E) applies some hysteresys around 0.45V while generating this signal. * one might see more or less lambda-deviation with or without this hysteresis (0.92V in the topmost entry disables this hysteresis) ---- '''Room for improvements''' * lambda-target is constant at the moment. ** possibly bias lambda-target down (say, by 0.15) at high-power (feed throttle-pedal signal into round ?).
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