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by phkahler
1457 days ago
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A lot of the complexity here is because the gear selector is considered a safety-critical part. They may also consider LED indicators on it as safety-critical information to the driver. Those two things - is the transmission receiving the real intent of the driver, and is the driver being told the actual state of the system - are just the top level. Security is also starting to be a concern, though I think there is room for debate about how far they need to go with that. It's common to have all drivetrain components on a dedicated CAN bus with a gateway between it and other stuff. Your infotainment system is not going to put the car in Park regardless of what you run on it. |
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https://money.cnn.com/2016/06/20/autos/jeep-recall-anton-yel...
I absolutely hate stateless switches on automotive stuff. Why can't I tell that my turn signal is on by 'feel'? Why do I have to rely on a (too quiet) clicking, or a (too hidden) indicator light?
I have an E70 X5 with the "new style" transmission selector, as well as a Tesla 3 that replicates it on the right side of the column. Thankfully most cars seem to have stuck with the "forward = reverse", "Back=drive" convention; confusing as it sounds, at least it replicates a move from neutral on an automatic with a traditional PRNDL lever.
Both cars also have stateless signals. The E90 and newer BMWs seem to have indicator clicks that are almost inaudible, and in almost every car I drive, the indicator lights are hidden behind the steering wheel, so you never know if the indicator has cancelled or not. On my "bad old world" BMW, at least you can feel the lever click down when it cancels.
The Tesla also has a stateless signal switch, but it doesn't give me the same issues. I think the audible "click" is a lot more distinctive or something. Alas, the green flashy light is way over in the middle of the car instead of conveniently hidden behind the rim of the steering wheel.