Year-Long Electric Bus Test Reveals A CO2 Reduction Of 60%

3 months ago by Mark Kane 24

EV bus with Toshiba SCiB batteries

Toshiba has wrapped up a 12-month test of electric buses equipped with its SCiB batteries, and 44 kW wireless charging system.

And as it turns out, medium-size EV buses have potential of reduction of CO2 emissions by up to 60%. The shorter, small-bus was rated at an 40% improvement.

Toshiba SCiB 2.9 Ah

The tests were carried out with the cooperation of Waseda University, on a regular service route between All Nippon Airways Co. Ltd. facilities in  Kawasaki, and the vicinity of the Haneda Airport in Tokyo from February 2016 to January 2017.

As positive results were proved, we of course hope for more electric buses to be forthcoming from Toshiba.

“Recharging was carried out with a magnetic resonance2 system operating in the 85kHz band, the proposed international standard. Magnetic resonance was selected as it is more forgiving than electromagnetic induction3, which requires close alignment and small separation of the charge transmitting and receiving pad. The charge pad in Toshiba’s system can be misaligned by as much 20cm along its width and 10cm along its length, and the two pads can be as far apart as 10cm.

Electric Bus with Toshiba’s Wireless Charger Cuts CO2 Emissions by up to 60% in Field Testing – route

The SCiB™ battery installed in the test electric buses is rugged, reliable and has a long life, showing almost no fall-off in performance even after 15,000 quick charge and discharge cycles. It is highly suited for use on shuttle buses operating at locations such as tourist sites and airports, which must combine heavy use with frequent and fast charging.

Toshiba also used the project to verify that a light-duty EV equipped with a wireless battery charge receiving pad could be efficiently charged by the same charging system as the bus.”

Commenting on the project, Dr. Osamu Hori, Director of Toshiba Corporation Corporate Research & Development Center said:

“I’m convinced that wireless rapid charging system will help boost the use of electric buses. Toshiba will continue research and development of convenient charging technologies and advanced technologies, and contribute to both reducing environment loads and improvement of the quality of urban transportation.”

Overview of the field test

Small Electric Bus Medium-size Electric Bus
Period From February 2016 to January 2017
Route Approximately 6 km between ANA business centers in Tonomachi, Kawasaki and Higashikojiya, Ota-ku, Tokyo Approximately 11 km between ANA business centers in Tonomachi, Kawasaki and Haneda Airport
Frequency 4 round trips a day 3 round trips a day
Charge time Approximately 15 minutes Approximately 20 minutes
Passengers ANA Group employees
Effect of CO2

emission reduction

42% 60%

[1]Calculated as follows:
Light oil CO2 emission coefficient: 2.83kg-Co2/l (Well to Wheel)
Electricity CO2 emission coefficient: 0.406kg-CO2/kWh
[2]Magnetic resonance has a longer power transmission range than electromagnetic induction, realized by utilizing magnetic resonance to equalize the resonant frequency of the transmitting pad and receiving pad, in addition to power transmission by electromagnetic induction.[3]Contactless charging where power is transferred by magnetic fields using magnetic inductive coupling between coils of wire.

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24 responses to "Year-Long Electric Bus Test Reveals A CO2 Reduction Of 60%"

  1. floodzone says:

    Still dont understand how an electric powered bus emits co2.

    1. David Lane says:

      Fossil fuel source of electricity. It does not emit from the bus, only from the power plant where the electrons are generated.

      1. philip d says:

        Correct. This is a well-to-wheels calculation for both the ICE bus as well as the EV bus.

        1. Birger says:

          Is there an explanation/definition of what Wheel-to-wheel is somewhere? I don’t understand the concept. Searching for wheel-to-wheel I end up with results that are “well-to-wheel”

          1. Martin Winlow says:

            Which is what we are talking about! NOT ‘wheel to wheel! As in OIL well to (vehicle) wheel… geddit?!

            Still an odd headline – why not just power the things from PV and make it 100%!

            1. David Lane says:

              Why not use power from PV and call it 100%?

              Because its more honest to use the actual grid mix that the bus tapped into.

              1. mx says:

                But there’s more profit in covering the Bus Maintenance sheds with solar, aside from lower pollution.

      2. floodzone says:

        your assuming then that the electricity generated comes from fossil fuels.smart city planners are all looking elswhere.

        1. Mikael says:

          Well 82% off the electricity comes from fossil fuel. And 31% off all electricity being from coal.
          Japan has one of the dirtiest grids on the planet.

          1. Martin Winlow says:

            They sure do… after Fukushima (wen they turned off all their nuclear, but that won’t last long).

            1. Mikael says:

              We can only hope, for the sake of the environment, that you are right and that they will turn them on again soon.

              1. Djoni says:

                Ex-Fukushima resident don’t agree with you, far from it.
                They’re forced back in against their will.
                The 6 February 2017 was detected 530 sieverts/h at the reactor.
                This kind of radio activity would kill instantly anyone close to it.
                It’s 7 times what has been monitored right after the accident.
                Would you go there?
                I won’t!
                https://www.theguardian.com/environment/2017/feb/03/fukushima-daiichi-radiation-levels-highest-since-2011-meltdown
                Japan has overcome the radioactive threat by “upping the sustainable tolerable level or radio activity from 20 to 100 millisieverts per year, a level 5 to 20 times superior to the international standard.
                It the same as ruling out obesity by stating that 500 pounds is the new healthy weight for a person.
                Problem solves.
                It looks like a law Trump would like to enforce.

  2. Ferd says:

    Looks like they use light oil, so well to wheels isn’t green.

    1. georgeS says:

      Fred,
      I don’t know for sure. It’s hard to tell from the article but I think it is an all electric bus.

      I suspect the light oil emissions numbers is what they used for the baseline.

      So it is a comparison between an all electric bus and one using light oil perhaps.

      Feed this bus electricity from solar panels and it’s darn close to zero emissions….unless you are a purist and want to count the CO2 from making the panels.

      1. zzzzzzzzzz says:

        Buses typically run at day time, how exactly are you supposed to feed them from PV panels?
        They are way too big to fit on bus roof.

        If you just feed grid from PV panels, it isn’t related to buses.

        1. Rhaman says:

          Tesla and others have storage batteries. Others use a credit system for calculations. Others store heat underground to produce power at night. Others use wind power. Others use hydro power. Alternative fuels are quite evolved and solar is just one of them.

  3. georgeS says:

    Seems to me BYD has pretty much proven that big batteries that run all day are better than small batteries with multiple charges and chargers.

    Also, I believe that Sci-B batts are pretty expensive.

    1. zzzzzzzzzz says:

      Basically yes, but specific situation may be very different in each place. In some places quick chargers on route may still make sense.

  4. mm says:

    So, I still don’t get it. Except for charging while underway, some kind of automated mechanical connection could be used. Didn’t Tesla have some kind of ‘snake’?
    How hard would it be for a bus to stop at a precise part of a bus stop that had sockets in the lane that mechanical arms underneath the bus could plug into? After putting solar on our house and watching every last watt, these induction and this resonance research is all great, but not yet as efficient …maybe improvements in capacitors will take buses from stop to stop, requiring much smaller batteries.

    1. ItsNotAboutMoney says:

      Wireless would be less prone to failure than a mechanical system.

      The key reason to have a mechanical system is that it’s easily capable of higher power. But if they’re looking at having wireless at bus stops so that the bus charges frequently, that wouldn’t need as much power per charge.

    2. zzzzzzzzzz says:

      They use overhead connectors for buses. Like this:

      They can be very powerful and quite safe, as they are high. But they are eyesore and demand charges from grid (charge for peak power) and peak electricity rate often makes them uneconomical.

      Wireless are not visible, but the peak grid rates still apply.

      1. BYB deals with Peak Demand Charges by having a Battery Storage Vault, which charges slower from the grid, and then dumps power to the bus faster.

        And, just like Beauty, ‘Eyesore is in the Eye of the Beholder!’

        People who hate seeing technical things, as not being beautiful, are best not to live in, drive in, ride on, or fly in, anything man made, if they have no appreciation for creations build by men (and women!).

        1. Warren says:

          Yes. There is nothing uglier than a gas station on every corner

          1. Warren says:

            Except the thousands of acres covered in asphalt for car parking.

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