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Originally Posted by cajunfj40
There's a few folks out there who are adapting complete Leaf drivetrains into alternate vehicles and figuring out how many of the OEM bits are needed to keep the system happy enough to still run, so that’s pretty straightforward. The not-yet-figured-out bits are how to integrate the Leaf brake controller into the vehicle’s braking system, so as to get the feedback needed for regen braking. Current theory is that no regen other than throttle-off will be available without the brake controller interfaced. That ought to be figured out before I get a budget, so not worried about that yet.
So, what all is involved in slaving duplicate devices together on a single CANbus? I think EVTV is working on hacking the CANbus commands so they can run the motor/inverter (and other parts like chargers, AC, etc.) standalone with their GEVCU device. That might be the path forward, but if there’s an easier way to “clone” signals or “spoof” the CANbus so that added devices are slaved to the original devices, that would (maybe?) allow using all stock Nissan parts and code.
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So - running 2 Leaf controller/motor/drivetrains, and ABS feedback/regen braking ... with one or two battery packs and chargers, inside one vehicle with one throttle? And keep all OEM parts.
A single throttle into the GEVCU, and the GEVCU sending that signal to the same inverter address on two different CANBUs channels .. sounds like it might work. The brake pedal would need to work the same way, and both controllers can keep their own motor encoders, wheel encoders (or whatever they use to determine wheel speed) and deal with their own braking.
The brake light signaling could be an OR of the signals from each controller.
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I can also see the same techniques used to make an AWD dual-motor Leaf, by grafting a second front subframe in place of the rear suspension to hold the second complete drivetrain. The harder part would be figuring out where to put a second battery pack (to handle the current draw – stock pack is rated 90kW and that’s not enough for two 80kW motor/inverters) and how to deal with the extra weight of it – might need to turn the car into a 2-seater.
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Leaving the entire drivetrain stock .. * 2 .. and keeping them split except for the GEVCU and a couple of relays for the brake lights ... I can' find any holes in that at the moment.
The GEVCU code may need some tuning to put more braking on the 'front drivetrain' so that the rear end does not swing out during hard braking ... perhaps a fairly minor set of code?