Member Since: 17 Apr 2015
Location: Slovenia
Posts: 21
HDC details
I am thinking about buying a new D4 (will be my first Discovery, currently a Defender => A LOT of hesitation).
Two questions about Hill Descent Control:
- The user manual says that HDC speed can be controlled by Cruise control + & - buttons. How do I do if I have no Cruise control (which is a possible configuration in my market)?
- Does HDC only apply brakes to limit the speed or does it select a lower gear to take advantage of engine brake effect?
6th May 2015 7:54 pm
Cantthinkofone
Member Since: 21 Nov 2013
Location: Binfield
Posts: 37
I also don't have cruise control and asked this question on a Land Rover experience day, unfortunately no one knew the answer. Having now tried it on a few occasions, there seems to be a set speed in each gear so I have put it into command shift and then just select an appropriate gear for the hill, if you want to slow down a bit select a lower gear and so on. As far as I'm aware HDC will not change the gear for you, at least not in my gs model.
7th May 2015 10:40 pm
L319
Member Since: 14 Dec 2013
Location: Herefordshire
Posts: 2083
You can increase the HDC intervention speed with the throttle on vehicles with cruise, I assume its the same without cruise.
You can increase the HDC intervention speed with the throttle on vehicles with cruise, I assume its the same without cruise.
Pressing the throttle overrides the HDC, which isn't quite the same as increasing the speed it will maintain. I would assume without CC buttons, it has a default speed which may vary depending on gear selected. If you are requiring HDC to be functional, I suspect you would want to be manually selecting low 1st or 2nd anyway. Its an aide to good driving practices, not a replacement.
8th May 2015 7:28 am
Baltazar
Member Since: 17 Apr 2015
Location: Slovenia
Posts: 21
It's a bit clearer now, thanks. What about my second question?
There might be more info on this in the site wiki section. I don't think it will change down the gears otherwise it wouldn't work in a manual. That's why I would recommend assessing the downhill, select an appropriate gear, and use hdc as an aide. It is absolutely amazing how it works to control the vehicle at such a low speed on the steepest and slippiest of hills. Just remember though, it can't defy gravity and if the wheels start sliding you may need to throttle slightly to keep the wheels turning and retain control.
8th May 2015 10:37 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8227
It works on the abs brake system, along with reaction control.It can when others can't,
It will when others won't,
It goes where others don't.
All my LR vehicles that have had or have HDC are autos....so HDC is simple foot off the pedals & let the LR coast down whatever's in front.
........the HDC makes the odd noise & limits the speed - OK...the engine is at tick-over & doesn't stall.
So:
In a manual LR I trust you have to be in a low gear ?
but with feet off both pedals in a low gear with HDC do you have the risk of stalling ?
or do you put transmission into N ?
In an auto the HDC works in forwards or reverse or with the transmission in N...its one thing thats explained & demonstrated on LR experience courses
Disco 3/4 HDC works in high or low ratio....as it should.
Disco 2 HDC only worked in low ratio...which was as well as when my D2's HDC system failed all I had to do was use the gears to control the descent - as per usual LR methods
F'lander only has one transmission ratio anyway - so when you use the button feet off pedals & it works at one speed only about 5mph ishBREXIT - done properly.
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9th May 2015 6:36 am
jeepmadmike
Member Since: 18 Jan 2014
Location: Devon
Posts: 270
I'm not a big fan of HDC for anything challenging, but nor have I ever been a gearbox down hill off road person either I just use the brakes - if you know what your doing you can have far greater controlMY14 post man pat van
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13th May 2015 7:25 pm
tayaste
Member Since: 15 May 2013
Location: Chester
Posts: 7633
Really? Surely you must be using the engine to keep your pace down ? You wouldn't tackle a steep hill in neutral and just rely on your brakes to keep you on course? Would you ?
13th May 2015 7:28 pm
DaveDisco3
Member Since: 29 Apr 2014
Location: Gretton, Northamptonshire.
Posts: 597
Surely greater control is with gears engaged, hdc or no hdc from my experience.D3 Tonga HSE 2005
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13th May 2015 8:04 pm
galwaygreen
Member Since: 30 Oct 2011
Location: plymouth
Posts: 6525
surely hdc comes off if you touch the gas
13th May 2015 8:37 pm
Baltazar
Member Since: 17 Apr 2015
Location: Slovenia
Posts: 21
tayaste wrote:
Really? Surely you must be using the engine to keep your pace down ? You wouldn't tackle a steep hill in neutral and just rely on your brakes to keep you on course? Would you ?
I also think so, that's why I was asking if HDC uses brakes or engine to slow down. If you put gearbox in S and use shift paddles, you can manually select which gear is engaged, right?
I tried it in our driveway and down our steep road. It works, and pressing the CC+ and CC- buttons increases and decreases the speed, but it doesn't display what the set speed is.
Any way to show this? I think it would be a good idea to know what the set HDC speed is at all times.--
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Member Since: 14 Dec 2013
Location: Herefordshire
Posts: 2083
On my D3 the HDC intervention speed can be altered with the throttle . With HDC switched on and I want to maintain say 15MPH , I just open the throttle until the speed reaches 15mph and then hold it at that position. If the speed increases due to the hill the HDC cuts in to maintain 15mph. Opening the throttle doesn't cut the HDC out. Agree it is very poor practise to just use the HDC and not engage a low gear. Eventually the HDC will overheat and reduce/ cut out which is the last thing you need on a long decent.
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