then have to press (and hold) the ‘+’ button to walk. Release the button and it resets.
If it's a mechanical switch, it can jam. If there are two switches on a single controller, they can both be effected if the controller gets soaked in water.
If it’s a mechanical switch, it can jam. If there are two switches on a single controller, they can both be effected if the controller gets soaked in water.
Agreed. I think with any vehicle, I'd like to have a way of disengaging the transmission physically rather than rely on switches and software. Perhaps I'll start popping the chain off the chainring when it's parked up in the workshop 🤔
Assuming it fails at full power, and manages to stay upright untill it gets to full speed before it hits anything.
It's amazing how well a rider can balance a bike, while thier brain tries to keep up with what the heck is happening, while looking directly at the tree they really don't want to hit at 15mph...
It's a small risk, but a failure while riding is a concern, because you could be propelled into a tree/car/child's face with no warning.
My 8 year old car is subject to a recall at the moment - one seatbelt mount *might* have been damaged then *might* have corroded then *might* fail in a crash.
It’s amazing how well a rider can balance a bike, while thier brain tries to keep up with what the heck is happening, while looking directly at the tree they really don’t want to hit at 15mph…
And not apply the brake? I’m talking about in the OPs situation, where there was no rider.
I'm not one for knee-jerk reactions but...
BAN THE BASTARD THINGS!!!
From the OP's description it sounds like more than a 'walk mode' switch failure seeing as it's going for full power when turned on without any other control or pedal input from the user?
That's a bit more fundamental and sounds like any safeguards (Hardware or software) have not worked in this instance...
Anyone got any ideas as to what combination(s) of signal spoofing/component failure would actually be necessary to reproduce the OP's issue?
Assuming it fails at full power, and manages to stay upright untill it gets to full speed before it hits anything.
You'd be hard to justify that as a reason to downscore the risk/severity/RPN on an FMEA! These things are powerful and accelerate quickly, even quicker with no rider on.
And not apply the brake? I’m talking about in the OPs situation, where there was no rider.
In a panic people do strange things, this is the reason why there is functional safety, etc. One of the reasons why if you press the brake and accelerator in a car, it kills the throttle.
Dunno about bike companies, but Bosch most definitely will have considering the other industries they’re in.
A single point failure, leading to an unwanted ‘launch mode’ has to be a recall issue surely? Otherwise the emergency services are going to scraping lots of litigious dentists and accountants off of trees and the back of camper vans…
You would hope that Bosch/Shimano/Giant/Specialized would be designing stuff that is safe by design and these types of events can't happen with the software/hardware design and fail safes.
Be interesting to see how the power demand works on the bikes, does it just use the crank position or does it use a rudimentary torque sensor as well?
You’d be hard to justify that as a reason to downscore the risk/severity/RPN on an FMEA! These things are powerful and accelerate quickly, even quicker with no rider on.
They're not though, that's the point. They're limited to 250W for a reason, and that means they don't fall under the sorts of functional safety standards you're alluding to. Basically worst case credible consequences are bike scoots across floor and hits wall. Absolute tat and well below where you'd want proper functional safety design principles to kick in.
Be interesting to see how the power demand works on the bikes, does it just use the crank position or does it use a rudimentary torque sensor as well?
as I understand it, most commercial modern ebikes use a combination of torque,cadence and wheel speed to determine how fast to spin the motor.
This thread reminds me of when my brother messed up the ignition timing on his motorbike,when he dropped the clutch it went backwards ,he never saw that one coming 🙂
Oh and well done all the folk posting Christine links,the OPs bike is clearly possessed .
Simon Cowell off a low cost itv popular media show recently had an accident by falling off an electric mountain bike in which he broke his back.He said he should have read the manual first, but anything prpeled by an outside souse of power may at some time malfunction, a few years ago i had an electric nail gun , recalled due to the possibility as they said of it fireing randomly if used on an extension lead with something using the same socket.
electric mountain bike
?
Not so much an e-bike, more an electric motorbike.
A new report suggests that his e-bike was no bicycle at all. It was a Swind EB-01, described as the most powerful and advanced bike in the world, the Daily Mail says.
With 15kW of electric power, which means some 20 electric horsepower, it’s said to be deliver top speeds of 60 mph (96.5 kph) but can easily be made to deliver 80 mph (128.7 kph) with some tinkering. This would void the warranty, of course, but it’s never stopped thrill-seekers before.
The EB-01 is made to order and retails for £16,500 plus local taxes in the UK and $20,400 in the U.S. It’s a powerful electric motorcycle with pedals, made for offroading only. It comes with dual suspension, a choice of tires depending on your riding style, hydraulic brakes, regenerative braking, high ground clearance and a light frame that makes it fly.