Triple feedback position sensors, I like that!

It needs it really.

Even better if the run triple step down voltage regulators and wire them all separately and use the third sensor as a "best two out of three" reality check as you just mentioned.

Separate microcontroller for each and some code to talk back and forth, they probably doing something like this already is my guess but I don't know.

Only reason for multiple microcontrollers is what good is redundancy if a chip fails and all three sensors are going to same chip for the ADC or DAC conversions. Haha

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Tesla has been vague on exactly how their system works, even when Sandy Munro tears one apart there will still be secrets. One big advantage is packaging the steering column takes up a big chunk of the dash and firewall area. This is all leading to a driverless car ya know. I get the business opportunity but hate the idea of people not driving anymore.

So some leaks are suggesting Highland could hit by the end of the month in the United States.

 

my lc500 isn't steer by wire, but it does have toyota's VGRS (variable gear ratio system) and if one is not used to it, they'll oversteer at low speeds. my car also has rear steering so there's that too. those + lsd make u-turns a blast!

 

Brake by wire has been the case for hybrids (and not only) for over 20 years now. Brake feel isn't exactly the best. Safety could be better if there was a redundant motor & pressure accumulator, or at least if the motor was with inspectable brushes that don't eat the commutator. There is still a mechanical failsafe of sorts, which doesn't really work well when you have to suddenly stop a 2ton vehicle with unassisted front brakes - and the most common "motor ate its commutator" failure does tend to be relatively out of the blue.

Steer by wire on planes is pretty much mandatory for some of the stuff that they do - 737max is a decent example with the "I'll pretend that I'm a different plane" software, relaxed stability fighters are the other obvious bit. Planes do tend to get away with a lot of not-so-intrinsically-safe designs due to the severe lack of negligence across the board, though - planes are constantly scoped for issues, and are made to be scoped. With cars, it tends to be the other way around.

As for what Tesla uses - I've seen enough of them to not trust them with anything.

Re: the highland - I think the exterior is the only thing that I like about it:
like... come on.

 

That is not true brake by wire. Such a system has only an electronic sensor on the brake pedal is creates no mechanical force to move calipers. Toyota/Lexus hybrid has a conventional master cylinder combined with a brake force simulator and other components.

Same with steer by wire there have been a few cars with it but they still have a mechanical link.
This topic has been beaten to death. Obviously many people like the interior since Model Y and 3 sell in massive numbers.

 

It's a hydraulic brake-by-wire system. You can couple the calipers with the force generating mechanism as well but that's also generally extra weight where you don't want it. Pressure is released from the accumulator to the brake lines and from them back to the master cylinder, all via solenoids. Whether or not pressing the pedal will work the brakes or attempt to slow the car via regen is up to the ABS ECU to decide. Nothing non-brake-by-wire about it, other than the fallback.

Wasn't referring solely to the interior at all, actually - although the "turn signals on buttons" cost cutting bit sure does annoy me to no end. The pretty much forced with autopilot auto high beams that don't work particularly well, the autopilot disengaging while trying to check the speed (because no dash or hud), the... fogging windshield... uhh no.
Won't comment on range since 1) it's more than fine even with the lowliest spec rwd lfp and 2) the change is within margin of error anyways. For all intents and purposes, same as before. Charging speed is sub-par. It is an actual RWD sedan which is the biggest plus with the SUV craze nowadays.

 

Brake by wire or "by wire" in any system means electrical interface not mechanical.

Here is Toyota's hybrid braking system (partial)


As for Highlander I think the car is awesome I want one.

 

And here is a full diagram and not just a random page off the EPC:



Would you mind telling me how this is not a brake-by-wire system?

 

That's not brake by wire anymore than my Tesla has brake by wire. There is a fail safe that allows strictly mechanical pressure from the pedal itself. Diagram I posted is not random that is a 2015 RX, the same system used in every Toyota/Lexus hybrid.

 

...and the EPC diagram shows precisely nothing re: how the system operates.

And yes, this is brake-by-wire. The brake pedal has no direct effect on the brakes during normal operation. The ABS ECU reads some sensors (pressure & stroke) and commands solenoids to release high pressure fluid to the brake calipers as it sees fit. Yes, there is a failsafe - there is a mechanical interconnect failsafe with infiniti's steer-by-wire too, and it's not exactly a bad idea. The seized intermediate shaft that you mentioned is just somewhat unlikely compared to what can happen with a fully decoupled steer-by-wire system.

 

So you're fine with electronics and motors operating your brakes but not the steering rack.

 

I have a VGRS rack so I guess I'm fine with that too - assuming that there's a backup plan in case whatever in the system fails, and there's plenty to fail in such a system. Something's telling me that they won't put, say, two separate motors, inverters, (backup) power supplies (capacitor banks or whatever), etc. in that system.

 

nice, what car do you have that has vgrs? my lc500 has it.

 

Good pic.

It looks like it has two M/C pressure sensors.

This may imply there is pressure in the master cylinder(M/C) as the pedal is pushed.

From there it looks like the pressure is metered electronically.

It's really hard to say, just a guess.

 

Teslas might have bad paintwork, uneven gaps (Hello Freemont) but they dont really fail on road. I would not assume they didnt engineer it well - if anything, i would assume it is engineered well.