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 CCP EV emergency brake on highway, almost accident, Guess the brand

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brkli
post May 5 2025, 07:08 PM

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already got a big ass battery, still have single point of failure for keci miao 12v battery..

also what year is this? break = tyre locked? no ABS ke??

only 2 possibility. BYD failed design and quality issue, or driver sohai..

This post has been edited by brkli: May 5 2025, 07:09 PM
brkli
post May 5 2025, 07:19 PM

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QUOTE(knwong @ May 5 2025, 07:15 PM)
Which car will give indicator that 12V is running low?
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why no?? for ICE if your car cannot start. that is an "indicator" your 12V running low.. owai..
brkli
post May 5 2025, 07:29 PM

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QUOTE(ycs @ May 5 2025, 07:22 PM)
how is it charged? alternator?
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big ass battery step down charge small 12V battery..
brkli
post May 5 2025, 07:35 PM

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QUOTE(diffyhelman2 @ May 5 2025, 07:24 PM)
car got DC DC converter. just wondering why if got this they still use 12 V battery.
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actually, from engineering POV, still make sense to have this separate 12V battery for things like open/close door, e-brake, light and etc. that is provided it is working alongside a step down (to 12V) main EV battery. reason being, if one of the battery got damage, those critical component of the car (like e-brake, hazard light, ecu stuff) can still function.
brkli
post May 5 2025, 09:03 PM

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QUOTE(diffyhelman2 @ May 5 2025, 07:50 PM)
Electric E brake should be banned. Cable brake provided the best redundancy.
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well ABS use electronics sensor, eletric motor pump too.. owai..
brkli
post May 5 2025, 09:05 PM

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QUOTE(Boy96 @ May 5 2025, 08:57 PM)
Same battery as old myvi and axia without start stop

Battery code 38b20l
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QUOTE(Roman Catholic @ May 5 2025, 09:01 PM)
It's a normal 12V lead acid battery however because of it's special casing design it cannot be used in ICE because it cannot be secured safely. So owners of EV has no choice but to buy batteries from SC only. Knowing how genius owners are, yup I have seen ICE batteries fitted into EV and it's not secured at all, then ask apahal battery cepat Kong ya ?
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is it "normal" lead acid? i thought it is those deep cycle lead acid battery like those used in auto gate and as some(older) solar battery.. also EV dun need the high CCA which needed by ICE to start the car..

This post has been edited by brkli: May 5 2025, 09:07 PM
brkli
post May 5 2025, 10:11 PM

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QUOTE(mushigen @ May 5 2025, 09:23 PM)
From engineering pov, what you wrote doesn't quite cut it unless there's redundancy factored in. If the 12V kaput, can those critical components still work? I know in ICE cars, the alternator can still supply power.
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like i said work alongside.. means it can work if the main battery still working. the 12V battery need to be charged somehow, normally it is trickle charge using the step down voltage from the main battery meaning it will charge the battery while also powering the electronic component at the voltage around 12V - 13.8V.
brkli
post May 5 2025, 11:08 PM

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QUOTE(yushin @ May 5 2025, 11:04 PM)
Can they change the lead acid 12V battery to LFP 12V battery? I changed my Jazz battery to LFP 12V, 6 years already no issue.

BYD made so many LFP cells, can't make a 12V LFP battery?
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if 12V battery also LFP, they no money earn alrady.. those battery last like a very long time.. if got issue also BMS issue only..
brkli
post May 6 2025, 10:39 AM

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QUOTE(yeapsc73 @ May 6 2025, 10:17 AM)
Tesla used 16V Li ion battery since 2021. No mentioned whether LFP or NMC
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16V most likely is Li-po.. 4S Li-po to be exact..
brkli
post May 6 2025, 10:43 AM

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QUOTE(DogeGamingPRO @ May 6 2025, 10:37 AM)
Not emergency brake, just motor lose power and cuz EV motor so instead of cruise it just decelerates, but probably to the driver felt like emergency brake cuz stopped abruptly and can’t move

The 12v controls the connection between the main battery and the motor, so when 12v gone then motor also will lose power from main battery
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tu lah.. less component = more reliable, less maintenance. no gearbox, no clutches, direct motor power the wheel. when motor lose power... fuh...
brkli
post May 6 2025, 10:51 AM

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QUOTE(brkli @ May 6 2025, 10:39 AM)
16V most likely is Li-po.. 4S Li-po to be exact..
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QUOTE(haturaya @ May 6 2025, 10:45 AM)
Or 5s (odd setup) LiFePO4  hmm.gif
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yes, i think you are right.. should be 5S LFP/LiFePO4.. 3.2V * 5
brkli
post May 6 2025, 11:50 AM

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QUOTE(machomama @ May 6 2025, 11:19 AM)
kena a full power shutdown on my prius before - safety feature as engine was already running hot due to fauly electirc water pump.
disco lights came on with audible beeps
what the car did was GLIDE - this is what ALL cars (all ya, be it ICE, hybrid, EV) ought to comply
managed to bring it to a safe, off the emergency lane, stop
not a jam brake to complete stop like what this BYD "apparently" did

i use "apparently" as sometimes actual scenario can be misinterpreted.
highly doubt the tires came to a complete lock screeching on the tarmac, suspect there must have been some form of maneuverability to bring the vehicle to a safe stop.
maybe driver new to EV and panicked upon seeing there's no power at all
can be dangerous especially if one is on the right most lane, rain and in the dark - we know all too well how in broad daylight nonsense can happen anytime anywhere
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you need to understand. unlike ICE and hybrid. EV dun have gears (gearbox and clutches). the electric motor drive the tyre directly in most cases. as soon as the motor lose power, it is essentially the tyre "spinning" the electric motor similar fashion to regen braking or engine braking(in ICE).. ya, it most likely not the brake from your disc/hydrolic brake, but still braking from the resistance of the electric motor spinning is still a lot if you moving at certain speed.

This post has been edited by brkli: May 6 2025, 11:50 AM
brkli
post May 6 2025, 12:04 PM

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QUOTE(Roman Catholic @ May 6 2025, 11:58 AM)
Wait what ? 1 pedal and that 1 pedal is for both acceleration and braking too ? So how would the forklift know that whether you want to accelerate or brake ?
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QUOTE(TheEvilMan @ May 6 2025, 11:59 AM)
Release slow it goes slow, release completely it "brake" or stop, maciam ur rc car lo
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similar to how u ride BMX bicycle or any fixed gear bicycle. you dun need brake really, just the pedal. to stop the bike. just use your leg and resist the pedal.
brkli
post May 6 2025, 12:21 PM

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QUOTE(Sichiri @ May 6 2025, 12:02 PM)
The owner has been driving for 10 months, surely they can tell the difference between regenerative braking & Emergency braking
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you ask ICE driver about engine braking, see how many can tell you the difference. to most, it is just braking.. "emergency" just mean "it stopped quite fast"...
brkli
post May 7 2025, 02:02 PM

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QUOTE(machomama @ May 7 2025, 01:00 PM)
requires brute force strength to get the tire onto the mechanism - generally tow operators all badan tough no issue

there was an instance had to use dollies for both front tires (Front Wheel Drive), car was brought to safety beyond the emergency lane
right tire on road no issue, left one on grass (couldn't do anything, dolly kept digging further into the ground from the sheer weight of the car)

another tow truck came, powered up the AUX 12V batt with a bulky Powerbank, got the hybrid started and finally drove up the flatbed
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