 | Home > General & Technical (L663) > The MHEV system seems to prevent the Defender from coasting |
 
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| J77 Member Since: 04 Nov 2019 Location: Fife Posts: 3411  
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Everything, to me anyway, is working as it should. 24MY 90 D250 HSE, Tasman Blue
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16th Apr 2021 11:38am |
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| deaston Member Since: 18 Dec 2020 Location: UK Posts: 150 
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There's a huge difference between lifting your foot off and putting it in N. I found some literature online about the Evoque MHEV that says "Recuperates energy when you lift off the accelerator" so it makes sense that's what I'm feeling. https://www.landrover.com/liveforthecity/e...-what-mhev |
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16th Apr 2021 12:24pm |
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| Digger2000 Member Since: 19 Sep 2020 Location: Newcastle Posts: 590 
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I took mine for a long drive into the countryside yesterday and tested this out, it didn’t do any of these things. When I lift off the accelerator it decelerates as I expected it would. I would get LR assist out to check it over.
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17th Apr 2021 9:12am |
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| J77 Member Since: 04 Nov 2019 Location: Fife Posts: 3411
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I don’t think the Defender MHEV system coasts like the Evoque or DS.
All I can find from LR - The MHEV technology contributes to enhanced fuel economy through an efficient Stop/Start system which cuts the engine at a standstill, as well as recuperating energy normally lost under braking or decelerating. This energy is then sent back into the battery pack and can be redeployed later. A key benefit of MHEV is that this energy is used when accelerating, delivering faster responses for greater performance. 24MY 90 D250 HSE, Tasman Blue |
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17th Apr 2021 9:47am |
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| Gareth Member Since: 12 Dec 2011 Location: Woodford Posts: 1110 
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My view is that the Mhev on the Defender is no more than a fancy stop/start system that runs on 48v instead of the conventional 12v system.
There is an eco setting in the setup menus, that will enable the eco coach. This displays a green symbol of a foot on an accelerator pedal in the bottom left of the instrument panel when the car thinks coasting is appropriate. It does this from its knowledge of the road ahead, and can predict junctions, roundabouts, down hill sections, and sharp turns etc. It will display the graphic to advise you to coast. Put it into ECO tr mode and there are even more things to watch! All the energy harvesting or energy output to motion must come from the starter/alternator on the engine. There are no separate motors in the driveline to provide forward motion. Just how much assistance the mhev actually gives the car is not known to me. I don’t know if the starter/alternator can actually give power assistance to the engine other than a more powerful and faster restart after a shutdown and rest. I reckon a subscription to topix might reveal a bit more, but I’ve not felt inclined to do that yet. 2021 Defender 110 X-Dynamic HSE D300 MHEV 1966 S2a 109 aka Betsy |
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17th Apr 2021 10:25am |
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| J77 Member Since: 04 Nov 2019 Location: Fife Posts: 3411
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Yeah I’ve had a play with that.
The MHEV system is just a tick box exercise. To me it provides nothing of real worth over the non MHEV 3.0 engines in my Discos. 24MY 90 D250 HSE, Tasman Blue |
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17th Apr 2021 10:35am |
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| deaston Member Since: 18 Dec 2020 Location: UK Posts: 150
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My car has stopped doing it now. I’ve driven 240 miles and I noticed on my last journey that it was coasting as normal and was no longer “pumping” when in cruise.
I guess now the battery is full (or above a certain percentage) so the system no longer needs to be so harsh with the regeneration. |
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24th Apr 2021 12:58pm |
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| Gareth Member Since: 12 Dec 2011 Location: Woodford Posts: 1110
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The 8 speed auto is adaptive so it needs to learn your driving style. Maybe it’s satisfied with you now. 2021 Defender 110 X-Dynamic HSE D300 MHEV
1966 S2a 109 aka Betsy |
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24th Apr 2021 1:35pm |
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| DSL Member Since: 20 Aug 2007 Location: Wandering the wasteland. Posts: 837
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Slight aside but can you reverse with the driver’s door open? I’ve had 2 cars (BM 5 and Skippy) that just refuse to budge backwards with the door open, a useful manoeuvre when trying to back up in front of my garage.
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24th Apr 2021 2:20pm |
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| Retroanaconda Member Since: 04 Jan 2012 Location: Scotland Posts: 2656
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No, sadly not.
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24th Apr 2021 2:28pm |
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| DSL Member Since: 20 Aug 2007 Location: Wandering the wasteland. Posts: 837
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24th Apr 2021 2:49pm |
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| The_hog Member Since: 02 Aug 2020 Location: Reykjavik Posts: 36 
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In my Macan, after opening the door, it slams the parcking brake on. You then need to press the lever for the "handbrake" to be able to drive the car forward or backwards (with the door open). |
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24th Apr 2021 5:47pm |
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