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Post by Jim Hare on Mar 25, 2015 9:33:29 GMT 11
My 17 year daughter was driving the LEAF last night, about 40km round trip.
She said something strange kept happening. Sometimes when she would accelerate from a stop the LEAF would make a metallic grinding sound and there was a sensation of driving over grates, as if something was holding the car back and it was fighting against it.
(She described it later that it may have felt like the tyres spinning freely before gaining traction, but she doesn't hoon and was in close traffic so can't see it being this.)
Each time it immediately cleared and then worked normally for a while.
She also said an orange light on the dash may have come on for a moment each time but she only saw it in her peripheral vision so doesn't know which one.
Happened maybe five or six times.
I took it out this morning and will check it through the day. Haven't been able to reproduce it yet.
It was raining, is there a "super traction mode" or something that could have been engaging, or does anyone have any thoughts about what this might be?
I will do my best to reproduce it and as soon as I can, or have more evidence, I'll take it in for warranty repair. Think I have about 3 months left before hitting 3 years!
Any thoughts, theories or whacko ideas welcomed.
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Post by Phoebe on Mar 25, 2015 9:47:09 GMT 11
Hasn't happened to me. Good luck!
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РБМК
EV Enthusiast
Posts: 20
LEAF OWNER?: Yes
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Post by РБМК on Mar 25, 2015 9:53:18 GMT 11
Electric parking brake sticking?
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Post by Feng on Mar 25, 2015 10:09:33 GMT 11
How bald are your tires? No chance she ran over an oil patch or something causing serious loss of traction?
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Post by lesmando24 on Mar 25, 2015 10:34:05 GMT 11
Try Eco in the wet. The yellow flashing light is traction control. Eco tyres are crap in the wet and easily spin it is especially noticeable when you start at lights where your nose is higher than your tail, front wheel drives will spin the tyres.
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Post by Jim Hare on Mar 25, 2015 11:39:05 GMT 11
Tyres are in good shape but I do agree it was most likely spinning at the start of movement. She said it seemed to happen mainly when starting uphill.
Surprised we haven't noticed it happening in the past but on well.
A bit of wet, maybe a bit of oil, wouldn't take much.
The most difficult part is getting coherent information from a 17 year old who hasn't experienced these things before, making the description a bit vague!
Just got back from driving, works perfectly so I'm going to chalk it up to spinning unless something else arises.
Thanks for the troubleshooting assistance all!
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Post by philcanberra on Mar 31, 2015 23:57:38 GMT 11
Oh dear.
I've been working with brushless motors Now for a while. What she must likely felt was a miss firing motor. The motor has hall sensors inside which tell the speed controller which phase to send the power through. When these sensors fail either the motor won't work at all or you get get a high frequency vibration, usually around 20Hz or so. It feels like driving over a cattle grid. Up until the motor finally works out where it is and everything runs smoothly and the controller turns up the frequency to around 16khz. I've had this a few times in my electric scooter. But my scooter motor has a spare set of sensors built in so I switch to the spare ones and everything has been fine for the last 3 years. So much to go wrong especially when a $0.40 hall sensor stops working. They are held in with glue inside the motor and sometimes they can come lose. Either way it's bad news because the "grind" you can feel is a few THOUSAND watts of electricity going into the motor and NOT being used so it bounces back to the speed controller. This is not good and may damage it too. If it keeps happening get the car to Nissan.
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Post by philcanberra on Apr 1, 2015 0:01:06 GMT 11
Also if a speed controller detects huge back EMF spikes from the motor it may turn itself off for a while to prevent damage. My scooter controller turned off for 1 second then tried again.
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Post by philcanberra on Apr 1, 2015 0:04:28 GMT 11
This will also be made worse if the motor has to use more torque at very low RPM. just like slowly moving abd going up hill
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Post by jeffjl on Apr 1, 2015 14:42:33 GMT 11
Any more bad news Phil?
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Post by philcanberra on Apr 2, 2015 11:23:58 GMT 11
Lol. No. I knew my scooter was a cheap Chinese kit when I got it. I just passed 17,000km and had hardly any issues. Between my scooter and leaf I'm very happy with the vehicles. And these are v1,0 machines too
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