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Jim Kenzie of the Toronto Star tries out the U3-X - click above for high res-image gallery

If there is one thing people love, it's personal mobility. After all, what other species regularly harness other creatures for the sole purpose of getting around. The auto industry is all about personal mobility. Since the dawn of the car in the late 19th century, it has been adopted world-wide as one of the preferred means of getting around.

Mobility, of course, is about a lot more than just driving. Just moving around is important and when people find themselves unable to move or having difficulty, It plays havoc with the psyche. As populations in many countries get older, reduced mobility is an increasing problem. A number of automakers are researching ways to expand mobility beyond the automobile and the result is projects like GM's Puma and Toyota's Winglet. Honda, too, is studying the problem and while we were in Japan for the Tokyo Motor Show, Honda took us to their R&D center to check out a few of their recent projects. Read on for a first hand account of what we saw.


Photos Copyright ©2009 Sam Abuelsamid / Weblogs, Inc.


One section of Honda R&D is known as the Fundamental Technology Research Center. Here, engineers, scientists and technicians examine a wide variety of problems and search for solutions. Some seem wacky on the surface and have no relationship to transportation. One of those is Asimo, the bi-pedal robot. We've all seen Asimo at some point and while it might not be directly related, lessons learned developing it can be applied elsewhere. The law of unintended consequences can sometimes lead to positive rather than just negative results.

Other groups at Honda have been looking at mobility at the most fundamental level, that of just moving the body. As we age or get sick or injured this can become more difficult. We got to see and try out two different motion assist devices developed by Honda.

One is known as the stride management assist device. This one looks like a large belt with a pair of braces extending down from the hips that have straps to go around the thighs. The idea here is to help those that have motion issues to get a more even and effective stride. A pair of motors at the hips help to get the legs moving. Sensors measure the forces in each leg and help to amplify and even things out side to side. For example, if someone is shuffling or limping, the device gets the effectiveness of each leg balanced.

In practice, the sensation is quite interesting. At rest no force is applied. However, as soon as you start to walk, you can feel the effort required is reduced. It's a very interesting sensation and could be of significant value to those that need such a device, especially for walking up stairs or up a slope.

The Honda engineers measured what they called walking ratio, the length of stride divided by the pace (number of steps per minute). With the assist device, the ratio improved from 0.0043 to 0.005. Over a three-month test, they found the users stride increased from 0.55 to 0.6 m and the walking speed a little over 4 to nearly 5 km/h while the heart rate and physical load went down by nearly 20 bpm. This is not intended as a device for healthy people, but rather for those that have lost mobility and need help. For that, it certainly seems effective.

The second device to aid movement is the body weight support assist. This odd looking contraption consists of a pair of links tied together by a saddle. At the bottom of the links are shoes with tread force sensors built in. The idea here is to reduce the load on muscles and alleviate fatigue. In action, the device looks like some sort of bionic exo-skeleton for the legs. You sit down, put on the shoes and then turn on the device and raise it up between your legs. Motors in the links are controlled based on the sensors and in effect amplify the forces in your leg muscles.



In use, the effect is again that of reducing the effort to move your legs. If you squat down, and then stand back up, it's much easier with the device on. While the stride management device feels more natural thanks to the relatively unobtrusive mechanism, this one takes a bit more getting used to. The structure of the device means you may walk with a slightly wider than normal stance. However, it does achieve the desired effect.

Honda has been testing it with some workers in Saitama factory as well as with people in other applications. It has proved to reduce fatigue by over 20 percent when doing activities like knee bends.



At this point, Honda has no immediate plans to commercialize either of these devices but also doesn't rule it out. It's ultimately possible that it could build them in-house just as it now does with solar panels, or it could license the technology to another company like a medical device manufacturer.

In both cases, these devices share some ideas with Asimo. Knowledge gained by Honda engineers in studying the detailed mechanics of how humans actually move was fed into these programs and similar concepts are incorporated. Neither of the programs are directly connected, but there are synergies.

The third and, in many respects, most interesting device is the U3-X. Honda recently unveiled this little self-balancing unicycle. When it was first revealed a few weeks ago, most observers described it as a one-wheeled Segway. However, in several respects this is far more intriguing than a Segway.



First of all, it was designed to fit within the same space used by a walking human when in use, thus the single wheel layout. Unlike the gyroscopically controlled nerd icon, the U3-X only uses an inclinometer for its feedback loop. Assistant chief engineer Shin-ichiro Kobashi described the basic mechanism as similar to what you do when balancing a broom-stick on the palm of your hand. Continuous small back and forth movements are required to keep it upright.

Exactly how this is achieved is the cool part. The team devised what they called the Honda Omni Traction drive system (HOT drive). This mechanism allows the single wheel device to move in all directions, forward, back and left-right.

To achieve this, they incorporated something close to the same principle as a differential. A series of small wheels with their axis tangential to the big wheel surround what appears to be the circumference of the wheel. In actual fact there is no main wheel. The small wheels are sandwiched between a pair of side gears analogous to the side gears of a differential while the small wheels are comparable to the pinion gears.

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Each of the side "gears" is tied to a motor. When the side gears rotate at the same speed and direction, the small wheels don't turn on their own axis and the whole mechanism acts as one big wheel. When the speed of the side gears is varied, the small wheels start to rotate allowing the U3-X to move sideways or diagonally. Honda wouldn't let us take a close look at the wheel or photograph it, but there is definitely some interesting stuff going on there.

Riding the U3-X couldn't be easier. Turn it on and it just stands there making small motions to balance itself. The two halves of the seat pop out from the upper half and the foot pegs from the lower half. Sit gently on the seat and lean in the direction you want to go. The inclinometer detects very subtle changes in balance and makes immediate adjustments. The motions required are actually very subtle. Lean too far and too fast and it is possible to tip over but it's really very easy to stay upright.



With no controls other than your shifting weight balance, turning requires dipping a toe down to the ground to trigger a bit of rotation on the vertical axis. The whole process is incredibly intuitive and simply works. We were zipping around the room at up to 4 mph in seconds after sitting down.

The current form of the device weighs about 20 lbs and is designed for indoor use on relatively smooth surfaces. The wheel has no suspension and is not currently designed to deal with bumps, curbs or other protuberances. It could well be adapted for outdoor use on more uneven surfaces but it would get larger.

Unfortunately, Honda has no commercialization plans for the U3-X that it is talking about right now but they won't rule it out either.

With this small taste of what is going on inside the R&D department at Honda, we can only wonder what other goodies they are cooking up.


Photos Copyright ©2009 Sam Abuelsamid / Weblogs, Inc.

Our travel and lodging for this media event was provided by the manufacturer







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    • 1 Second Ago
  • 14 Comments
      • 5 Years Ago
      Is that Jim Kenzie from the Toronto Star?
      • 5 Years Ago
      It is even dumber than the segway (which may be been a good toy if it hadn't cost as much as a small car).
        • 5 Years Ago
        Sorry I didn't mean this was dumb in since of helping people but in the sense as a private transport device. I think it is a great piece of technology and would serve those with mobility problems really well. I just don't think it would make much sense if used by the general public for moving around town.
        • 5 Years Ago
        You know, one day when you need a knee replacement, or a hip replacement, or arthritis is so bad you can't more, I hope you are confined to your sofa because you think such devices are pointless.
      • 5 Years Ago
      ^^what a bunch of trolls. This 'fundamental' research is every bit as relevant as the coverage of the GM-Segway "Puma" device. It's also completely ridiculous to ridicule these devices as "un-green" because of the resources they use - they're intended to help people who can't walk as it is. Would you prefer them be vegetables? I hope a thousand acres of pristine rainforest burns for every asinine, excessively eco-focused thought that comes into your head.
        • 5 Years Ago
        Heaven forbid we needed to re-invent the power wheel chair with something that is less comfortable and more difficult to maneuver...

      • 5 Years Ago
      What's wrong with the Segway anyway? I've always been intrigued by them but have never tried. And this UX3 thingie seems even cooler and more practical. Think outside the box, people! "Cars" are so last century -- GREEN MOBILITY is the issue.
      • 5 Years Ago
      Some may find some interest in this device, but that tortured justification to include it in an autoblog... really? Maybe to sort it out for you, is there a fossil fuel device that this is going to displace? No. Then this is an expensive device which will use up more natural resources and generated electricity than the usual alternative of walking. Therefore, it is not a green device. And of course it is not an auto. It cannot be used to commute or to take a vacation or to visit grandma.
      • 5 Years Ago
      This device answers a question nobody asked...
        • 5 Years Ago
        Sounds like the exo-suits the military is trying to develop, except this is aimed at disabled civilians.

        I think until the military perfects it and starts using it and mass producing them (if that even happens), there's no way that this will be cheap enough for a disabled person to actually get one.

        hmm we can give this person an electric wheelchair or an EXOSUIT for 50 times the cost...
        • 5 Years Ago
        It is a future platform for all kinds of robots.
        Honda just need a "product" to tie their patents to.
      • 5 Years Ago
      When I posted on this subject on Autoblog, I was taken to the woodshed (so to speak) about my comments. Same as the ones posted here.

      Let's set the record straight.

      I was not referring to those who may find this device necessary. Hey, I am a champion of people with disabilities and limited mobility problems, and I fight for their rights everyday. My rant is at those who really don't need this to move aroundand see this as simply another play toy. I suffer from joint pains, but I can walk up to 10 miles a day without a problem. But there are people aound me that are way younger than me who would hop in their cars and drive two blocks over to a friend's house rather than walk or even ride a bicycle. These are able-bodied people who can move faster than me but are too lazy to even mow a lawn (and I blame that on the parents). Htese are the people I'm talking about-the lazy jokers who our tax dollars will be supporting within the next few years through welfare.

      Sorry if I offended anyone.
      • 5 Years Ago
      It's not dumber than a segway. this one is WAAAAAY more portable. i can imagine ppl putting it in their backpack which u can't do with a segway.
      • 5 Years Ago
      I think that new Honda U3-X doesn't fits me. I would rather buy car than that but I don't think I can afford to buy brand new car nowadays. Car buyers are one of the consumer groups that have been adversely affected by the recession, as there is a surplus of cars but a shortage of available credit. Part of car financing is the down payment often done with a trade in, just as with other big ticket items such as houses or boats, but that being said, car sales are beginning to trend upward again. Trade in vehicles with the Cash for Clunkers program was popular when the list of acceptable trades wasn't up in the air, but some people are coming up with cash down payments for new cars. Some car buyers had savings they were utilizing, and others were coming with down payments from installment loans.
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