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S60 & V60 '11-'18 / XC60 '09-'17 General Forum for the P3-platform 60-series models |
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Volvo XC60 Alternator Control - Brake Energy RegenerationViews : 924 Replies : 9Users Viewing This Thread : |
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Feb 27th, 2024, 09:41 | #1 |
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Volvo XC60 Alternator Control - Brake Energy Regeneration
I am looking for information on when the 'Brake Energy Regeneration Mode' was introduced to the XC60 Alternator Control and what models this function is operative on and can it be switched on/off with VIDA?
My current understanding is that from 2010 Volvo introduced a Battery Monitoring Sensor and this is used to check Battery SoC and on some vehicles when the battery is above a certain percentage the Alternator Control changes from 'Conventional Charging' to 'Brake Energy Regeneration, Quick' (in daytime only) 'Brake Energy Regeneration, Slow No Discharge' is the mode used during the night. Can anyone provide a link to further technical information on this feature? Still reading and learning. My concern with this is there is a large discharge on acceleration which looks like the Alternator is used as a motor to assist engine, is this true? Here is a great video showing the function in action:- https://www.youtube.com/watch?v=6-GfTlLmNjU Last edited by Wardair; Feb 27th, 2024 at 10:57. |
Feb 27th, 2024, 11:49 | #2 | |
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Feb 27th, 2024, 14:28 | #3 |
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Hi I think from about 2010 volvo started fitting so called smart alternators and the fluctuating charge current is caused by this .
My car does the same and as you say once the battery has reached a certain soc the alternator then just tops it up when the engine is on the overrun. Similarly when you apply power the alternator cuts out to reduce the load . Just Another way of helping to reduce emmisions Hope this helps
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Feb 27th, 2024, 15:02 | #4 |
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Aternator Charge Modes
Hi Clan and Johnnyoro
Thanks for your reply. I do not have VIDA but my Diag Tool does show live data streams and when the Alternator is in 'Brake Regeneration, Quick' mode on my car there are very large battery discharge currents when accelerating hence my question. I did read somewhere that the direct drive alternators are actually used as motors to briefly assist the engine during acceleration is this true? |
Feb 27th, 2024, 15:36 | #5 |
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Hi you are probably thinking of the mild hybrids that use the alternator as a motor at times
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2017 XC60 R Design Lux Nav D4 Fwd Driver support pack , Winter pack , Family pack , Sunroof , Front and rear parking sensors, + Puddle lights |
Mar 1st, 2024, 13:17 | #6 |
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Alternator Control
Can anyone explain why there is a 50A battery discharge when the vehicle accelerates, that is a a lot of power (600W) more than is needed just to run the vehicle?
It certainly looks strange to me if Alternator Charge Mode 2 is just turning the alternator off on acceleration. Alternator Charge mode 3 (nighttime) has the comment 'no discharge' so what exactly is the different between mode 2 and mode 3? |
Mar 1st, 2024, 16:35 | #7 | |
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Mar 11th, 2024, 10:21 | #8 |
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Battery Discharge on Acceleration
Hi Clan,
I am aware of electrical power to hp conversion but my question was does the car need 600 watts to run and take 50A from the battery without any alternator input? With no extra electrical items (heated mirrors rear screen etc) on other than lights? If so then the alternator is just turned off and on plus Alternator Charge Voltage Request is increased during overun/braking when Brake Energy Regeneration,Quick mode is operative. Just trying to understand what is clearly an interesting charging philosophy and it does raise the question of what type of battery should be fitted (start/stop capable)? |
Apr 24th, 2024, 14:07 | #9 | |
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The alternator will compensate immediately for any extra load you turn on or is needed eg power steering .... Regarding the type of battery there are AGM and Advanced flooded Mat , I just use the correct part Number from Volvo.
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Apr 24th, 2024, 17:53 | #10 | |
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https://batteryworld.varta-automotiv...ults-interpret The graph shows a dip after starting with a regular battery SLI shows a dip and the alternator immediately returning to full charge, with start-stop the system allows the battery to drain down before charging back to 80%-ish allowing headroom for charging while braking or on overrun. 600W could be your car stereo blasting out your bangin' chunes.
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alternator control, brake energy regeneration, xc60 |
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