General > General Technical Chat
The Glorious Return of a Humble Car Feature
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coppice:

--- Quote from: tom66 on April 29, 2023, 09:10:47 pm ---
--- Quote from: coppice on April 29, 2023, 08:08:57 pm ---If you have ACC why would you want to set the target speed in 1MPH increments? Do you have some 33MPH speed limits you need to match? My Volvo just sets the car's speed at the time you enable ACC, and moves from there to rounded 5MPH steps on the buttons.

How are you going to match the reliability of a redundant physical switch with something as flaky as capacitive touch controls?

--- End quote ---

I won't comment further for risk of incriminating myself  ;D, but maybe the limit could be considered, as a friend of mine declares "speed limit plus some VAT", so the 1mph adjustment is helpful to set an ideal speed.

I can easily see why a captouch button would be more reliable than a physical switch.  There's no possibility of moisture or dirt getting in or behind the button (that's happened on my previous car that has physical button for ACC, I had to take it off and clean it).  The captouch buttons could continuously calibrate themselves to the 'no press' condition so they can handle dirt etc. building up on the switch area.  Given the safety-critical nature of controls like this, I am certain the manufacturer has taken a decent amount of effort to ensure they are safe and operable for a very long time.

This car also has the option to set the speed limit to the detected road limit, and decelerates automatically to match a new limit.  Very clever... a little too clever!

--- End quote ---
Trying to make the continuous adaptation in cap touch sensors be really robust in the presence of things frequently waving around near the pad but not touching it is quite a problem. Not one I've ever seen fully solved. Water on the pad is also a serious problem. The more robust solutions now use guard electrodes, and that has got touch pads into some kitchen appliances where I'm not sure they really belong. A lot of effort has gone into things like phones, and they still screw up the adaptation quite often. Its pretty benign there, as phones aren't usually controlling heavy loads. You just blank the screen, wake it up, and it re-adapts. Not all touch in cars uses the capacitive approach. The IR matrix approach is much more robust, but I don't see how that could be used on a non-flat surface. The kind of inductive touch used in things like security keypads and elevators, where you minutely deform a diaphram can be extremely robust.
Psi:

--- Quote from: tom66 on April 29, 2023, 06:19:33 pm ---
--- Quote from: Stray Electron on April 29, 2023, 04:30:35 pm ---   Keep this in mind, OVER 50% of the drivers in Florida have NO insurance despite the fact that it's been required by the state since about 1969.

--- End quote ---

I really like the idea NZ has:  basic third party liability cover comes from a tax on gasoline/diesel.  So per mile you pay for your 3rd party insurance.  You are of course responsible for damage to your own vehicle, but that's really only your problem if you damage it.

--- End quote ---

err, you must be thinking of a different country.  We have 3rd party but you pay for it. Not part of fuel tax.
3rd party cover is usually around NZ$200-$350 a year
where as full cover is around NZ$600-$1500 a year
themadhippy:

--- Quote ---If you have ACC why would you want to set the target speed in 1MPH increments
--- End quote ---
maybe its a universal design used across the entire range of the manufacturers vehicles,so 56mph  would need to be settable
m k:
I want to put it to something 7.
5 is irritatingly too low and next 0 start affecting speed cameras.
jonovid:
the horseless carriage comes full circle ::)
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