RDoc
2021 Prerefresh Model S
I suspect they can turn motors on from 0-100% with no perceptible "shock" since they're completely computer controlled. Why would the regen be unavailable, and what do you mean that regen helps keep the axle on the road?
I also suspect they will use differential left/right braking in addition to front/rear torque splitting to achieve better 4 wheel traction control.
What would be really interesting is if they could use all that to also tighten the turning circle. Strongly brake the rear inside wheel, mildly brake the inside front wheel and drive the outside front wheel faster than the outside rear wheel. There'd be some scrubbing, but if this were only done on very tight turns I wouldn't think there would be any appreciable wear.
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I had another, perhaps crazy, thought. Assume that on the 85D (non P), the gearing and motors are the same as has been reported. In that case, perhaps for a slight efficiency gain, the car could cycle back and forth between the two motors on the highway so each would stay cool. Run one till it starts to warm up, then switch to the other, etc. This would be a bit fraught if the car weren't running in a more or less straight line, but for highway travel, where efficiency is an issue, it might help.
I'm not sure though that the pitch of the car would remain constant with the torque moving from front to back though. That may be an argument for using the front motor alone on the highway since the nose of the car might lift less to counter the torque on a coil sprung car. For an air suspension the car could compensate.
I also suspect they will use differential left/right braking in addition to front/rear torque splitting to achieve better 4 wheel traction control.
What would be really interesting is if they could use all that to also tighten the turning circle. Strongly brake the rear inside wheel, mildly brake the inside front wheel and drive the outside front wheel faster than the outside rear wheel. There'd be some scrubbing, but if this were only done on very tight turns I wouldn't think there would be any appreciable wear.
- - - Updated - - -
I had another, perhaps crazy, thought. Assume that on the 85D (non P), the gearing and motors are the same as has been reported. In that case, perhaps for a slight efficiency gain, the car could cycle back and forth between the two motors on the highway so each would stay cool. Run one till it starts to warm up, then switch to the other, etc. This would be a bit fraught if the car weren't running in a more or less straight line, but for highway travel, where efficiency is an issue, it might help.
I'm not sure though that the pitch of the car would remain constant with the torque moving from front to back though. That may be an argument for using the front motor alone on the highway since the nose of the car might lift less to counter the torque on a coil sprung car. For an air suspension the car could compensate.