I like this idea a lot. It is a flaw in the current system that you must change speed in order to shift in some ways, because when climbing up a hill you may want to still be in a lower gear. It would also be cool to have more manual inputs in the system. For instance, ideally if you could push varying setting for normal, hill, racing...etc on the bicycle's control box that would be very useful. These setting could have different programming for gear changing and utilize different sensors. That way you could put in an sensor for incline without forcing the rider to utilize this if they just want to go up the hill slowly. I actually considered doing this as an input function, but the programming would have been much more longer and complicated for this application. If I was going to actually market this product, I think it would be a great idea.
I agree with you that our design would not be good for racing, because it is meant for a person who wants to just have a comfortable ride to school or to work. Many basic level riders do not shift enough or shift too much. And most people riding their bike to school or work do not need all of the 21 speeds (or whatever) the bike offers. So this system utilizes four gear sets that are spread out over possible gear ratios in order to select a good gear for the speed of the rider. I understand the concerns about smoothness and that is something we tried to address, but of course it is difficult to address every riding conditions. So the compromise here is that you don't have as many gears for a varied amount speeds, but you also don't have a bicycle that is shifting constantly. If you really get pedaling quickly (as I even tested), the bicycle will skip shift steps (due to the timing of the program) if needed. Also to address comfort, we made the upshift different from the downshift for each gear. So even with a lot of variation in speed close to a shifting point, you won't get redundant shifting. Also, the movement of the servo motors is very quick (and since it can move both gears at the same time) it is actually quickier and equally as smooth (since it uses the same derailuer of the manual shifting bike). And the shifitng only occurs when the pedaling is constant in order to get smooth shifts. More of the features in order to improve smoothness and the ride are in the paper. Thanks for your comments and interest.
Neat idea, but maybe in the abstract, not in a practical sense. As a long-time touring bike rider and trainer of the 1984 USCF National Womens Criterium Champion, an automatic shift is the last thing one wants for touring or racing. Quite often it is important to anticipate what gear one wants to be in for an expected situation. Typically, one selects a gear to suit the terrain, wind, and pedalling cadence a rider can maintain. Riding in a pack of other riders, whether racing or touring, also affects the choice of ratio desired. No thanks, but I think KISS is the best.
I think a sweet addition would be an inclinomter to measure the angle of the grade, so even if the rider doesn't slow down that much, it would still downshift to give the rider more torque to handle the hill.
I think, however, power output of the rider would be a better measure than speed, albeit more expensive to obtain. User selects an upper and lower output range, and tranny controller adjusts to maintain. There are cycle computers out there that measure output, so it's probably possible, although more complicated. Of course there is another complication to be handled. You don't want the bike to shift while the rider is cranking down hard on the pedals. The audible "tranny controller suggests a change" melody would be a signal to the cyclist to ease up for the shift. If the system senses the ease in pedal pressure, then the shift occurs.
Next challenge: a cyclist airbag system for falls and collisions. And it has to weigh under 3 pounds.
The other problem that needs a solution in the many mountain trails in CO is the mountain bike operator.
On the roads and trails close to Golden, abuse of the trail privileges by speeding cyclists have had the effect of RATIONING the times mountain bikes can be ridden on these trails.
If the people riding concentrate on THEIR " Share the Road " responsibilities, rather than changing gears, then this would be a win-win for the other people and animals using the trails and roads.
If this encourages the " darn, YOU spilled my latte by using the trail while I was on it " crowd, then this setup is a step backward.
For me, adding a Golden Motors Magic Pie motor was the real system that made my Corsa HPV useable up here.
This one comes pretty close to reading the mind of the cyclist. Perhaps even closer than the automobile's automatic transmission. I wonder if this will make it easier to drink coffee while cycling. The automatic trans in the auto certainly helped me in that area.
There have of course been several attempts at bicycle automatic transmissions, but I don't think the problem will truly be solved until somebody comes up with one that can read the mind of the rider.
Cool idea. We actually wrote about a Trek bike project several years back that tackled the automatic shifting idea. If I recall, there were concerns around performance, however. Not sure the shifter can match the steady power and the smooth operation of manual shifting for a rider who gets in the groove pedaling.
For 3D printing to make the jump from rapid prototyping to manufacturing, engineers will need to find easier ways to move products from their CAD screens to their printers.
Gigabit and PoE are two networking technologies moving ahead in tandem as industrial users power remote Ethernet devices such as IP security cameras at 1,000 Mbps over existing CAT5 cable.
New versions of BASF's Ecovio line are both compostable and designed for either injection molding or thermoforming. These combinations are becoming more common for the single-use bioplastics used in food service and food packaging applications, but are still not widely available.
From Dell / Intel® New Paradigms in Design Work Scott Hamilton, vertical market strategist for Dell Precision workstations, 5/2/2013 5
Early in my career, I worked as a draftsman and remember the days of drawing on vellum with numbered pencils and Mylar with plastic lead. This was a fun experience in the sense that I ...
I've been using workstations for more than 10 years and love finding ways to get more performance from my system. With demanding professional applications that require more power each ...
A lasting memory from my first job as an engineer in an auto assembly plant is standing on hard concrete at six in the morning, vending-machine coffee clutched in hand, listening to ...
For industrial control applications, or even a simple assembly line, that machine can go almost 24/7 without a break. But what happens when the task is a little more complex? That’s where the “smart” machine would come in. The smart machine is one that has some simple (or complex in some cases) processing capability to be able to adapt to changing conditions. Such machines are suited for a host of applications, including automotive, aerospace, defense, medical, computers and electronics, telecommunications, consumer goods, and so on. This radio show will show what’s possible with smart machines, and what tradeoffs need to be made to implement such a solution.
To save this item to your list of favorite Design News content so you can find it later in your Profile page, click the "Save It" button next to the item.
If you found this interesting or useful, please use the links to the services below to share it with other readers. You will need a free account with each service to share an item via that service.
Tweet This
2 
