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Super Capacitor Buses in Shanghai


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The presentation provides a glimpse of new technology developed in China - Super Capacitor Buses. It took 8 years to Sunwin Corporation and Volvo.

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Super Capacitor Buses in Shanghai

  1. 1. New Electric Technology Buses in Shanghai
  2. 2. Shanghai Expo <ul><li>Shanghai Expo, organized by Bureau of International Exhibition (BIE), is expected to attract around 70 million visitors in the city. </li></ul>
  3. 3. Expo Theme <ul><li>The theme of the exposition is &quot;Better City – Better Life&quot; and signifies Shanghai's new status in the 21st century as the &quot;next great world city“. </li></ul>“ Better City, Better Life”
  4. 4. <ul><li>Sunwin Bus corporation is one of the leading bus manufacturers in China. There are lot of the green and white Sunwin and Volvo buses in Shanghai, which have become synonymous with efficient public transports in one of the most rapidly growing cities in the world. </li></ul><ul><li>Shanghai Sunwin Bus Corporation (SUNWIN) is a 50:50 Joint Venture company between Chinese and Swedish: </li></ul><ul><li>Shanghai Auto-motive Industry Corporation (SAIC) </li></ul><ul><li>Volvo (China) Investment Corporation (VIC) </li></ul><ul><li>Volvo Bus Corporation (VBC) </li></ul><ul><li>The company has a registered capital of US$54.22 Million and total investment of US$97 Million. </li></ul>About Sunwin Bus Corporation (SUNWIN)
  5. 5. SUNWIN delivered different technology buses at Shanghai Expo. The technologies for these buses of the future were developed by the company in cooperation with the other part-owner in the company, Shanghai Automotive Industry Corporation.
  6. 6. <ul><li>120 electric buses featuring engines powered by onboard batteries. </li></ul>Sunwin Technology at Shanghai Expo 40 buses equipped with super capacitors that are rapidly charged when the buses halt at bus stops. 150 hybrid buses. Currently, the company has delivered three types of buses – Electric, Super Capacitors and Hybrid
  7. 7. Electric Buses Electrical buses are equipped with batteries that can be run for some three hour before they are exchanged to a freshly charged battery pack at one of the end stations.
  8. 8. <ul><li>Electric Bus Technology </li></ul><ul><ul><li>Super / Outer Capacitors (Energy Storage device) </li></ul></ul><ul><ul><li>Collector (fitted on the top) </li></ul></ul><ul><li>Super capacitors can be charged much faster than batteries, but hold less energy (at the current time). </li></ul>Super Capacitor Buses It is a new form of electric bus powered via energy stored in large onboard super-capacitors. A connector in the roof connects to the stationary electrical installation when the bus stops to let the passenger on to the bus.
  9. 9. <ul><li>2003 – Experience in CBD Area </li></ul><ul><li>2004 – 15 km of routes </li></ul><ul><li>2005 – 4 test vehicle were launched </li></ul><ul><li>2008 – Route 11 , which is a short circular trolleybus route of just 5.5km in length, was placed in experiment with 70 buses and 10 charging station </li></ul><ul><li>2010 - 36 buses are deployed at Shanghai Expo </li></ul>Development Phases Shanghai municipal corporation supported the electric bus development in the city. It took 8 years to develop super capacitor technology. 2003-04 2002-03 2005 2008 2010
  10. 10. Body Specification <ul><li>LXBXH – 11980 X 2550 X 3650 </li></ul><ul><li>Weight – 18 tons </li></ul><ul><li>Highest speed – 50 kmph </li></ul><ul><li>Maximum climb – 12 degree </li></ul><ul><li>One Charge – 3-6 kms </li></ul><ul><li>Charge </li></ul><ul><ul><li>Current – DV620V-720V </li></ul></ul><ul><ul><li>Energy Storage – DV320V – 600 V </li></ul></ul><ul><ul><li>Horse power – 100 kw </li></ul></ul><ul><ul><li>Time to recharge – 30-80 sec </li></ul></ul><ul><li>Fully CAN System </li></ul>
  11. 11. <ul><li>A fully charged capacitors could be able to supply enough power for a bus to travel a total distance of 5km (about 3 miles & 200yds) at 44km/h (a little over 27mph). </li></ul><ul><ul><li>Half-way charging time of 30 seconds, you can run 3-8 miles on a single charge, the maximum speed of 44 kilometers </li></ul></ul><ul><li>Recharging is done by means of a railway-style pantograph fitted to the buses' roof that made contact with an overhead power supply. </li></ul><ul><li>The buses have a regenerate braking energy system, which recycle back energy into the super-capacitors - instead of just being lost via wheel brakes or rheostats. </li></ul><ul><ul><li>Energy consumption cost of only 33% of car fuel in the braking energy recovery when braking up to 40%. </li></ul></ul>Super-Capacitors
  12. 12. Energy Collectors
  13. 13. Energy Collectors
  14. 14. Energy Collectors
  15. 15. <ul><li>Total Kilometers – 1.6 million </li></ul><ul><li>Ridership – 6.9 million </li></ul><ul><li>Energy Consumption – 0.98 KWH/km </li></ul><ul><li>Restore Energy – 30% </li></ul><ul><li>Store Energy – 65% </li></ul>Performance in the City Photo by Zheng Han Photo by Volvo Bus Environment Blog
  16. 16. <ul><li>For the initial testing the Shanghai Sunwin Bus Plant built four prototype super-capacitor electric buses, each one costing as much as RMB800,000, this being almost as twice expensive as a conventional Sunwin air-conditioned trolleybus. </li></ul><ul><li>The super-capacitor buses cost as much as RMB 800,000 each (approximately £6,600) a figure which includes the research cost. </li></ul><ul><li>It is estimated that if the trials prove successful and super-capacitor buses go into mass production then the cost will go down to RMB650,000; in comparison an air-conditioned Sunwin trolleybus costs only RMB400,000. </li></ul>Cost
  17. 17. <ul><li>Currently, the buses have poor energy/weight ratio compared to Lithium batteries. However, these buses can be recharged very fast, which allows them to be charged at every, or every other stop without inconveniencing the passengers or driver. </li></ul><ul><li>The ideal system, would then be to combine the high capacity of Lithium batteries, with the faster charge and higher cycles of Super Capacitors. Between these two technologies, it would seem that the Nanobus is now practical and feasible. </li></ul><ul><li>Over the next few years, with new emphasis on EV and Plug-in Hybrids, that the differences between Super Capacitors and Advanced batteries will likely converge. </li></ul>Performance - Super-capacitor Bus
  18. 18. <ul><ul><li>Trial run was not very successful, within a week of the trials commencing 5 out of the 7 super-capacitor buses were broken down. Apparently the problems have been blamed on the capacitor overheating due to the city’s climate. </li></ul></ul><ul><ul><li>There were 7 charging stations along the loop, as buses traversing the loop are not always able to charge at every one of them. </li></ul></ul><ul><ul><ul><li>For charging, accurate docking is very essential because the charging process requires the charging facility to detect sensors on the super-capacitor bus - and this is only possible when it is stopped close to the footpath. </li></ul></ul></ul><ul><ul><li>Super-capacitors buses compared to normal trolleybuses had slower acceleration and were smoother to ride - especially above 30km/h [20mph]. </li></ul></ul><ul><ul><li>Perhaps the most significant issues was that because of the lack of recharging facility when returning to the garage bus drivers must drive to conserve the stored energy, which means switching off the air-conditioning, very modest use of the accelerator pedal, etc. </li></ul></ul>Trail Run – Route 11 Source:
  19. 19. <ul><li>40 super-capacitor buses are being used on a special Expo bus service designed to also showcase Chinese technology. </li></ul><ul><li>However, owing to the super-capacitors overheating causing some of the buses to break down. </li></ul><ul><ul><li>The super-capacitors work best when below 40 degrees 0 C, whilst when they reach 50 degrees 0 C an automatic safety lock is applied to the buses. </li></ul></ul><ul><li>In addition, it has been found that the buses use more electricity when operating in higher temperatures, and therefore with the buses needing to be charged more often Shanghai Bus Co has also had to install more charging facilities along Expo Avenue. To allow for charging buses now spend 30 - 45 seconds at each bus stop. </li></ul>Project Showcase – Expo 2010
  20. 20. Thank You!!