Auto hold

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PhilHornby
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Location: North Devon

Post by PhilHornby »

Indalo wrote: Thu Apr 04, 2024 9:25 pm I don’t know what you read but I most certainly don’t understand any reason to deactivate Autohold.
I occasionally disengage it for a bit of 'precision' reversing - just to get rid of the inevitable, slight jerk that can otherwise occur.
indalo wrote: ...while the latter is operated by an electrical switch which, in conjunction with the ECU, signals the cable actuated parking brake to operate, just as the 20th century handbrake,
I would expect the Tucson to use the rather more modern mechanism, of a motor that drives the rear brake pads home...
alan sh wrote: Thu Apr 04, 2024 10:09 pm Also, on an uphill slope, I find that when I set off with autohold, the car goes back a few inches before going forward. With EPB, it doesn't.
Yes, I've noticed that effect too. Even when it's the Smart Cruise Control doing the 'launch', it can still roll backwards slightly :(
N Line S Hybrid (HEV).
23 plate - built Nov '22

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Indalo
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Location: Herts/Spain

Post by Indalo »

Just for the record, I don’t recognise the difficulty mentioned concerning hill-starts. Nor have I ever encountered any jerk while parallel parking in the tightest of spots and, living on a hill on a very busy main road, I have to perform both those manoeuvres almost every time I use my car.

After 7.5 years driving with Autohold & EPB, I think I might have noticed if those complaints had occurred.
2023 Tucson Hybrid (HEV) Ultimate; ordered 12/05/23 - collected from dealership 07/06/23.
kassy64
Posts: 38
Joined: Sun Mar 31, 2024 10:42 am

Post by kassy64 »



Here you go, listen from 55 secs, cancel auto hold when driving down hill or reversing.
pharaoh
Posts: 93
Joined: Wed Feb 07, 2024 4:27 pm

Post by pharaoh »

I'm with Indalo on this. My Auto Hold is switched on and left on for every journey and I've experienced no problems at all.
With two previous cars, a Hyundai and a Skoda, the AH was permanently on (didn't have to be switched on every trip) and again, it worked seamlessly.
We shouldn't pay too much attention to claims for the same vehicle in other countries. They might appear to be the same car, but the systems we can't see are often different to those fitted to UK cars.
Philr
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Location: On top of the Chilterns

Post by Philr »

That didn't look like a Tucson more like a Santa Fe and it was from the US and there was a gotcha as it says :-
Model shown in video is for demonstration purposes only. Availability and functionality on your vehicle may vary.
I can't understand why it says that you should turn it off when going downhill to prevent sudden movement. Sounds like another lost in translation issue.
It's obviously personal choice on whether you leave it on or not or even use it at all but like pharaoh we've had it on previous cars and never had any issues.
Phil

I don't have a carbon footprint because I drive everywhere.

2022 Premium HEV
kassy64
Posts: 38
Joined: Sun Mar 31, 2024 10:42 am

Post by kassy64 »

I've only had my Tucson N Line S a few weeks so have no idea what it even does, hence why I checked out the video.
Still not sure of the difference between applying 'autohold' and the 'parking brake' button is to be honest, to me they do the same thing.
From the UK version Tucson handbook _

WARNING
To prevent, unexpected and sudden
vehicle movement, ALWAYS press your
foot on the brake pedal to cancel the
Auto Hold before you:
- Drive downhill.
- Drive the vehicle in R (Reverse).
(vehicle equipped with shift button)
- Park the vehicle.
kassy64
Posts: 38
Joined: Sun Mar 31, 2024 10:42 am

Post by kassy64 »

As above UK handbook for current model Tucson clearly states that the Auto Hold must ALWAYS be cancelled prior to driving downhill or reversing. That certainly has not been lost in translation and covers UK models.
kassy64
Posts: 38
Joined: Sun Mar 31, 2024 10:42 am

Post by kassy64 »

Just thinking through what they are trying to say. Do they mean always press footbrake to release the auto hold prior to going downhill, as opposed to switching the auto hold system off before driving downhill?
Maybe that's what they mean and have got their phrasing wrong.
pharaoh
Posts: 93
Joined: Wed Feb 07, 2024 4:27 pm

Post by pharaoh »

Someone will explain how each system works in finer detail than me, but simply put, if you switch on the AH at the start of every journey you can pretty much forget any other fripperies during the journey. If you stop at traffic lights or for any other hold up, a decent push on the brake pedal as you come to a stop will hold the car in place until you need to move off and depressing the accelerator will get you moving again with no delay, fuss or bother. Contrary to what others say, the brake pedal can be feathered so that the AH doesn't engage, so if you're gentle with the brake and accelerator pedal, it's easy to do parking manoeuvres etc without any jerky movements.
When you finish your journey with the AH still on, the parking brake will automatically engage when you switch off the ignition and you need do no more.
Having said that, I find it pays not to get blase about about all of these electronic systems working as they should every time. To that end, I always check that the red PB symbol is lit before I exit the car and furthermore, even though the dashboard tells me that the PB is on, I still take the time to pull up the switch manually as my drive is on a slope.
pharaoh
Posts: 93
Joined: Wed Feb 07, 2024 4:27 pm

Post by pharaoh »

kassy64 wrote: Fri Apr 05, 2024 9:57 am Just thinking through what they are trying to say. Do they mean always press footbrake to release the auto hold prior to going downhill, as opposed to switching the auto hold system off before driving downhill?
Maybe that's what they mean and have got their phrasing wrong.
Pressing the footbrake doesn't release the AH, pressing the accelerator does.
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