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Easy-X |
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 Easy-X Super Spammer

Joined: 08 Mar 2019 Karma :   
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 Posted: 09:32 - 28 May 2019 Post subject: eBike to simulate motorbike |
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So upgraded the tyres on my ebike at the weekend from E-marked 50kph tyres to 75kph as top speed now is ~30mph. And was giving it a bit of a test ride...
Then I realised a crucial difference: on a motorbike if you ease off the throttle you start to get engine braking so the throttle regulates speed in both a positive and negative manner.
For the ebike you have no such effect. It's the equivalent of getting up to 30mph, letting go of the throttle and, at the same time, grabbing the clutch and coasting. Not great! Now the thing about my latest build is that the motor has a regenerative braking feature: when you hit the brake lever [switches] the motor goes into reverse and turns into a generator.
I'm wondering how close I can get to the "motorbike experience" by having throttle zero = activate regen. Unfortunately this is binary - either the regen is on or it's not - unlike a motorbike throttle. ____________________ Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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thx1138 |
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 thx1138 World Chat Champion

Joined: 06 Oct 2005 Karma :    
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 G The Voice of Reason
Joined: 02 Feb 2002 Karma :     
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Easy-X |
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 Easy-X Super Spammer

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Easy-X |
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 Easy-X Super Spammer

Joined: 08 Mar 2019 Karma :   
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 Posted: 12:07 - 28 May 2019 Post subject: Re: eBike to simulate motorbike |
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G wrote: | With a decent programmable controller you should be able to setup it to do, well, whatever you want.
I've got a decent slipper clutch on my (most-used) ICE bike to prevent too much engine braking.
Even without regen, my direct drive hub motor e-bike definitely does offer some 'engine braking' - one of the reasons I went for geared hub motors on the trailer! |
The motor I have at the moment offers almost no resistance with regen switched off and that's direct drive...
I was thinking of conjuring up a circuit that checked if the throttle output was zero volts and then flipped the brake switch but I'll have a look what the controller can do. ____________________ Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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 Easy-X Super Spammer

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 G The Voice of Reason
Joined: 02 Feb 2002 Karma :     
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Easy-X |
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 Easy-X Super Spammer

Joined: 08 Mar 2019 Karma :   
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 Posted: 13:48 - 29 May 2019 Post subject: |
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Experiment 1: at what point will an off the shelf circuit (like an opto-isolated relay) activate from the low signal from the throttle? (Throttle position generates a voltage from 0v to 5v.) Hopefully lower than a typical LED trigger voltage of 1.2v otherwise the bottom 24% of the throttle is dead zone
Experiment 2: run a manual push button to the controller's ebrake input. Ease off the throttle and stab button. Use imagination to consider if this was the effect I was looking for.
Bonus news item: my boss is on holiday and he's left a stack of ebike connectors and wiring and things on his desk where he rigged up a relay switched 12v headlamp from his 6v Bafang lamp output  ____________________ Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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 G The Voice of Reason
Joined: 02 Feb 2002 Karma :     
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GettinBetter |
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 GettinBetter Crazy Courier
Joined: 20 Jun 2019 Karma :     
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Easy-X |
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 Easy-X Super Spammer

Joined: 08 Mar 2019 Karma :   
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 Posted: 16:33 - 20 Jun 2019 Post subject: |
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Nobody with any sense connects lithium-ion batteries to anything directly
I have a 2-wire BMS (battery management system) which handles both charging and discharging, over & under voltage, etc.
As an aside you can also get 3 or 4-wire BMS boards where the charging and discharging circuit are separate which obviously would be no use in a regen scenario. ____________________ Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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Old Thread Alert!
The last post was made 6 years, 15 days ago. Instead of replying here, would creating a new thread be more useful? |
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