How about posting pic's and info on the drivetrain? I'm really curious to how your going to drive the rear axles
Lol, well that's the hardest bit to photo, but I'll have a go this weekend if the weather is up to it !
As for info, you can think of the front two axles and the rear axle as two separate systems;
The front two axles are fairly conventional in that they are driven though a ZF 8HP90 8-speed automatic transmission coupled to an NV225 transfer box which has electronic Hi/Lo range selection and "Torsen" limited slip diff driving to the front and 2nd axles via KAM locking differentials.
The rear axle has a YASA 3-phase AC motor with a 2:1 reduction gear and electronic dog clutch, also driving through a KAM locking differential.
In electric mode, the vehicle is 2WD with only the rear axle driven, the NV225 is in neutral and typically the petrol engine is off, though it can be spun up and synchronised (in terms of speed) before engaging gear in the transfer box if the batteries are getting low or we are approaching the maximum drive speed for the electric motor (c. 47mph)
Once the petrol engine takes over, we are in 4WD, the electric motor is typically disengaged (by means of the dog clutch), although it can be left connected while the motor controller goes into regen mode, allowing the batteries to be recharged from the motion of the vehicle. Regen can continue to operate up to about 85mph after which the motor must be disconnected to prevent destructive rotational speeds
6WD has two modes of operation - conventional (so to speak), the electric motor is synchronised to maintain the same speed as the petrol drive train for use in low traction conditions (snow, mud etc). In sports mode, the electric motor is there to "fill in" the gaps in the petrol torque curve. To this end, in WOT (wide-open throttle), it does not try to synchronise to the engine speed, but rather puts down as much torque as it can without breaking traction, allowing the petrol drivetrain to catch up, this gives maximum acceleration.
Horsepower Curves
Torque Curves
Hope that gives you some idea of what's going on, as I said, I'll get underneath and try to get some decent pics if the weather stays dry (this is Britain after all !
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