Marco, Every car is a little different, so you are wise to use a controller that you can program to simulate signals from a recent car's engine, whether 3, 4, 5, 6 or 8 cylinder (there are 10 and 12 cylinder cars, not many though) Modern sparkplugs are driven individually with an ignition coil that gets a pulse from the ECM and gives feedback whether a spark was detected. Regarding injectors - the ones I have seen have no feedback and are simply 2-wire with a pulse to open, no error is generated if one is unplugged. But they are in the feedback loop for lean/rich mixture so you will need to use the pulses to control the Oxygen sensor feedback. MAP/MAF is slightly tricky since it is also in the feedback loop. Throttle control: ECM driving the throttle opening motor, I have never tried to unplug it to see if there is an error. Oxygen sensor: most are heated and the ECM will measure and report an error if the sensor is not drawing the heater current (failed open). The oxygen sensor output of the upstream sensor(s) *must* vary from lean to rich with the modulation of the injectors. Downstream oxygen sensor(s) typically generate a continuous (non varying) signal because the Catalytic Converter stores/releases oxygen for complete combustion, in the rhythm of the lean/rich modulation of the injectors, except that occasionally the car's diagnostics will try to determine how well the Cat still stores oxygen by deliberately running rich and measuring how long it takes for the downstream oxygen sensor(s) to detect that the Cat is no longer emitting complete combusted products. Then there are knock sensors, timing sensors, vacuum, temperature and so on. Don't forget the valves and sensors that measure if the fuel tank is sealed, valves that purge early (cold, rich) exhaust as re-circulation through the engine again and all kinds of other emissions reduction tricks. The fuel tank level sender, sometimes pressure sensors for example for oil pressure, oil temperature sensor(s), (automatic) gearbox control signals and feedback, speed sensor on the gearbox output RPM, and so on. It better be configurable because there are a lot of differences between different cars. Some cars have a hot coolant storage thermos bottle that has a pump and 3-way valves. More and more cars are (mild) Hybrids that have electric motors, controller and battery - not sure that you want to simulate all that... Best is to get a hold of the service docs of a couple cars and figure out what is involved in their engine and how to keep the ECM happy. Success!
Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info http://www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of Marco Gaxiola via EV Sent: Tuesday, January 03, 2017 12:03 AM To: Electric Vehicle Discussion List Subject: [EVDL] Recent Model EV Conversion - CAN and accesories to work.. I'm in the middle of a 2013 EV conversion project (well is not a very recent), but as some of you may know; newer vehicles comes with more and more electronics that operation of some devices and features of the vehicle relies on the ICE data and information being generated by the ECM (OEM computer) thru the CAN Bus. When you convert a vehicle like this, you face some problems by the abscence of the running engine such: - non electric powered steering. - non operation of the AC unit (assuming the AC compressor and everything is there like original). - non working turn signals.(some models with digital turn signals) - missing gauges on the instrument cluster like RPMs, speedometer, etc. plus a bunch of red and amber known warning lights on. (and of course a lot of DTC codes when reading the OBD port) - etc... I tryed to find other threads about this subject but did not find any, at least not recently. So I decided to post this one, hope that someone has already face this problem and become able to fully convert newer models without affect most OEM features from the vehicle. If someone has done this, please share your experience. But if not, let me explain my thoughs and share your comments/feedback of what you think or suggest me to do: - My first idea is to design a small PCB with a micro on it, that would simulate most ot the analog and digital signals that the ECM needs from all the sensors on the gas engine to keep it running like the water temperature sensor, oil pressure, cranckshaft sensor, oxigen and manifold sensors (MAF and MAP), etc. My theory is that this could be a simple way (since most sensors are analog 0-12V, 0-5V of On/off outputs) that are not so complex to emulate, and doing this way; the ECM would believe the ICE is there running all fine and perfectly. Of course, the algorithm and maybe some of the simulated PCB outputs would have to be changed on every different model of vehicle. (every manufacturer uses many different sensors). But it would be a nice device if same vehicle is beeing converted, like in a fleet project. - The second thing, would be to go on a higher leve of microcomputer-microcontroller design that would allow to talk to many of other units on the vehicle thru the CAN bus, trying to replace those specific commands and data generated by the ICE, needed by those devices to correctly operate, Such RPM and speed for the electric power steering as example. The challenge here would be that, like the one before; every model and vehicle brand, has propietary CAN communication protocols that would be a monumental job to reverse engineer and interpret those codes, isn't it? I'm not so familiar with automotive CAN procols altough I undestand CAN bus at the communication/physical level. Any thougths or suggestions? Marco Gaxiola EnergyEV.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20170103/4914 d072/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
