Interesting Commercial Ebike (BB-motor-integration)

[MitchJi]

Hi,

http://www.nevi.it/news-eng.html

I like the belt drive:

The Nevi Bi-KER mountain bike prototype demonstrates the integration of electric energy with the handling and simplicity of a bicycle. Extreme lightness, tight and steep single-track capability, walk-upstairs and car roof rack convenience, set it apart from the electric moped characteristics of current electric bikes.

Technical Description
Nevi grade 5 and grade 9 titanium frame with integrated electric powertrain and battery housing, tracking-truss fork, belt-drive, tension adjustment dropouts with post-mount rear caliper. Frame design makes size customization possible, and maintains best bicycle balance and thus handling

Specifically developed Mavel three-phase electric motor, control and power electronics

Kinetic Energy Recovery electric braking and selective coasting function, and energy recovery whenever a higher heart-rate is desired – innovative ways of extending electric assist range

Patented lightweight drivetrain precision machined by Cobi

Control logic concept with Torqrank torque-feedback, heart-rate based programming, and uphill launch control

Compatibility with fixed-gear, multispeed rear hubs to multiply output torque and obtain desired pedaling cadence

Lithium-Ion-iron phosphate battery with power grid and photovoltaic recharging, and regenerative braking

Lightweight design: 13.3 Kg

Functionality
The Nevi Bi-KER mountain bike prototype is a hybrid-electric bicycle; it is aimed at those who have a passion for pedaling, for the handling agility that only a lightweight and well balanced bicycle can offer, and for long rides in varied terrain. The hybrid function is obtained with the innovative interaction of muscle energy with electric energy.

This is made possible by the combination of a specially conceived and developed control strategy and electronics, and the extreme design integration of the electric systems with the bicycle’s geometry, simplicity, and lightness. High quality and precision materials and manufacturing assure this bicycle the highest levels of technology.

The control logic is designed in order to maintain a desired level of effort by the rider, and to recover electric energy to recharge the battery whenever possible. This can happen in these conditions:

• 1.in the obvious way, by recuperating kinetic energy during braking. It is done in novel ways, with the electric powertrain located where the bicycle’s center of gravity and inertia are not altered, but still in continuous connection with the rear wheel’s rotation. The control logic is designed in order to assure correct front-to-rear braking torque balance
  
  2.it can also happen whenever certain coasting conditions, recognized by specific algorithms, are favorable for energy recovery and not for coasting speed
  
  3.the muscle energy-electric energy hybridization happens based on pedaling effort sensors, and the interaction with the heart-rate monitor. Depending on desired, rider pre-programmed effort and heart-rate levels, the electric assistance or recharging functions are activated.

This prototype is momentarily not equipped with a multi-speed transmission. This is due to the fact that a suitable, fixed-gear, multi-speed rear hub was not identified. With a multi-speed rear hub, multiplying or de-multiplying muscle and electric torque becomes possible. This enables the rider to select a desired pedaling cadence, while having the benefits of electric assist and energy recovery.

It is estimated that, depending on rider habits and training, course topography, and system programming, energy recovery can recharge the battery with the ability of extending electric range from 5 to 20%.

These characteristics should be evaluated in conjunction with Bi-KER’s unique electric assist bicycle feature: light weight. Light weight, apart from the immediate and obvious handling benefits, also means convenience of use normally not associated with electric bicycles:

• 1.The ease of walking the bicycle whenever riding is not possible: up and down curbs, up and down stairs and elevators, so the Bi-KER may be brought indoors in the same as with any bicycle
  
  2.The ease of lifting Bi-KER on a car’s roof rack, or onto a train.

Another typical feature of high-level bicycles is also possible with Bi-KER: frame size fitting. No element of Bi-KER’s construction inhibits nor forces the frame’s size. This feature is not normally associated with electric-assist bicycles.

Partners:Mavel Macchine veloci – electric motors and electronics – Pont St. Martin (AO), Italy

Cobi high precision machining – Modena, Italy

 

[Hillhater]

difficult to see how the motor drives the B Bracket ( internal or external ? )
Seems over -complicated to me (brake distribution logic ?) and is anyone really interested in battery regen ?
but i guess that have to mention it all in order to justify the impressive cost ! :lol:
.....which was not mentioned. 1

 

[damonjackson_spl]

another glorified cyclone principle kit..

looks like a small inner tiny toothed sprocket driven by the electric motor and a fancy freewheel crank belt drive!!

might have to do a belt drive mod to me 29er, looks quite nice, dont really fancy cutting the frame to get the belt into the chainstay however

 

[boostjuice]

Italian ay?..... Part of the European union...so.....250W motor/pedalec I'm betting :yawn: Here we go again..... Beautiful engineering gone to waste trying to adhere to retarded power restrictions. Such a shame.

Imagine what kind of freakishly high power/weight bikes the Europeans would be making if it wasn't for those piss weak laws. All the nicely engineered stuff keeps coming out of Europe, but apart from 'Clean Mobile' drive systems, all the manufacturer's seem to be sheepishly adhering to EU laws.

I have no idea why that motor/controller arrangement has small PCB's arranged radially around where i would expect magnets/coils to be......What the hell is going on there?

WTF! V V V V

 

[briogio]

Well I think this thing is brilliant for several reasons; very lightweight, ideal placement, recharging possibilities, but mainly weight, I don't see any lightweight alternatives Thanks MitchJi for bringing it to our attention 8)

 

[Solcar]

Whew, look at that complex circuit board. I miss the days of elegant analog circuits.

 

[HAL9000v2.0]

Open gears are not souch good idea but I like the frame.

Ofcourse IMHO.

 

[neuraxon77]

I wouldn't call this bottom bracket integration, instead I'd call this frame integration as it's still a 2-stage reduction, just with gearing and the motor in the frame.

Nice to see this kind of evolution happening, though not how I would do it.

 

[LI-ghtcycle]

Get a few movie stars to ride these, get them to be "cool" to the general public, and THEN someone will start making a much more practical version, but that won't happen until there is a market to sustain, so I'm all for it!

Also, don't forget, this is the prototype, the production version will probably not even use regen. :wink: