BYD K series

The BYD K-series bus (sometimes just referred to as the BYD ebus or BYD electric bus) are a line of battery electric buses manufactured by the Chinese automaker BYD, powered with its self-developed lithium iron phosphate battery, featuring a typical operating range of 250 kilometres (160 mi) per charge under urban road conditions. It is available in several different nominal lengths, from 7.0 to 13.7 m (23 to 45 ft) and also as a 18 m (60 ft) (articulated) bus. The rear axle is powered by two electric traction motors; the battery capacity and motor power of each model varies depending on the nominal length and passenger capacity.

BYD K series (ebus)
BYD K9 ebus in Shenzhen
Overview
ManufacturerBYD Auto
Production2010–present
Assembly
Body and chassis
ClassBattery electric bus
Body styleSingle-deck bus (rigid and articulated) and double-deck bus
Floor typeLow floor
Powertrain
EngineElectric wheel hub motors
Electric motorPermanent-magnet synchronous motors
PropulsionIGBT–VVVF
Electric range250 km (K9)

History and development
BYD K9A Bus is running Guangzhou Trolley Bus Line 583

The first BYD battery electric K-series bus was manufactured on 30 September 2010 in Changsha city of Hunan province. Previously, BYD had built electric vehicle models like F3DM, F6DM and e6. K9 has a 12-meter body length and 18-ton weight with one-step low-floor interior. It is reportedly priced at 2–3 million yuan (S$395,000 – S$592,600).[2]

The K-series bus has been sold to operators in China, India,[3] Japan,[4] Hong Kong, United States, Colombia, Chile, Spain, Netherlands, Denmark, Aruba and Singapore.[5][6][7][8][9][10]

The company extended its production base in Tianjin, China at the end of July, 2012[11] and may plan to manufacture in Brazil[12] and Windsor, Canada.[13] BYD built and operates an electric bus factory in Lancaster, California, US. The new factory started production in October 2013.[14] In December 2014, another manufacturing plant began operation in Dalian, Liaoning, China.[15]

Specifications

BYD model numbers (e.g., K9) include K (designating "transit bus") and a number (designating nominal length; larger numbers indicate longer buses).

Various letter suffixes have been applied, including:

ModelImageNominal
length		Seats
(max)[lower-alpha 1]		PowerTorqueBattery
capacity		Range
(max)
K5[16] 6 m (20 ft)11–17+1 [lower-alpha 2] 97 kWh210 km (130 mi)
K6[17] 6.5 m (21 ft)11–21+1 [lower-alpha 2] 144 kWh265 km (165 mi)
K7[18]/K7M[19][lower-alpha 3][lower-alpha 4] 8.5 m (28 ft)13–26+1 2×90 kW (120 hp)[lower-alpha 2]2×400 N⋅m (300 lb⋅ft) 215 kWh254 km (158 mi)
K8S[22] 10.3 m (34 ft) (double deck) ? 2×?2×?  ? kWh ?
K8[23]/K8M[24][lower-alpha 5] 10.5 m (34 ft)20–39+1 2×150 kW (200 hp)2×550 N⋅m (410 lb⋅ft) 391 kWh315 km (196 mi)
K9[26]/K9M[27][lower-alpha 6][lower-alpha 7] 12 m (39 ft)23–44+1 313 kWh253 km (157 mi)
K10B[30][lower-alpha 8] 14 m (46 ft) 13+1[32][lower-alpha 9]  ? 292 kWh ?
K11M[33][lower-alpha 10] 18 m (59 ft) (artic.)55+1 2×180 kW (240 hp)2×1,500 N⋅m (1,100 lb⋅ft) 578 kWh311 km (193 mi)
Notes
  1. "+1" indicates driver's seat
  2. Single traction motor in China.
  3. In North America, the K7M was designated K7 and had a smaller 180 kWh battery with a claimed range of 220 km (137 mi).[20]
  4. Also available as an extended-range K7MER, with enhanced power using traction motors from the K8/K9 and extended range from a larger battery.[21]
  5. In North America, the K8M was previously designated K9S and had a 350 kWh battery with a claimed range of greater than 370 km (230 mi).[25]
  6. In North America, the K9M was previously designated K9 and had a 324 kWh battery with a claimed range of 251 km (156 mi).[28]
  7. Also available as an extended-range K9MD, with enhanced power using traction motors from the K11M and range from a larger battery.[29]
  8. Intended for use as an airport shuttle bus. A customized variant was designated K10MR and sold to Denver RTD.[31]
  9. Maximum capacity of 106+1 (standing/seated combined)
  10. Previously designated K11, with a 652 kWh battery and claimed range of 370 km (230 mi).[34]

BYD's official published specifications for its K9 electric bus include:[35]

  • Electric power consumption: less than 100kWh/60mins[36]
  • Acceleration: 0–50 km/h in 20s[36]
  • Top speed: 96 km/h[36]
  • Normal charge: 6h for full charge[37][38]
  • Fast charge: 1h for full charge[37][38]
  • Overnight charging: 60 kW maximum power for 5h full charge[37]
  • Range: 155 miles (249 km)[37][38] (186 miles (299 km) according to some reports)[38]
  • Length × Width × Height: 12,000 mm × 2,550 mm × 3,200 mm (472 in × 100 in × 126 in)[39]
  • Standard seats: 31+1 (31 for passengers and 1 for driver)[39]
  • Weight: 18,000 kg (40,000 lb)[39]
  • Clearance between one-step entry and ground: 360 mm (14 in)[39]

Two or more versions of this bus have been delivered. The two-door version is in service in China's Shenzhen, Changsha, Xi'an and Shaoguan while the 3-door version operates in Shenzhen, Bogota[5][40] etc. for test and demonstration purposes.

Battery and powertrain

The K-series buses are powered by LiFePO4 batteries developed by BYD, which also have been applied to BYD e6, BYD DESS and other energy storage products. BYD claims that the chemical materials contained in the battery can be recycled without any toxins.[37] Battery capacities range from approximately 100 to 600 kWh, depending on the fitted drive axle and bus size. As tested at Altoona for the United States market, consumption and range were 1.36 kWh/mi and 173.62 km (107.88 mi) (K7),[41]: 117  1.74–2.45 kWh/mi and 280 to 394 km (174 to 245 mi), depending on the operating cycle (K8M with 435 kWh battery and the 2×150 kW (200 hp) axle),[42]: 12, 89  1.99 kWh/mi and 208 km (129 mi) (K9 with 324 kWh battery and the 2×90 kW (120 hp) axle),[43]: 13, 140  and 2.09 to 3.74 kWh/mi and 254 to 455 km (158 to 283 mi), depending on the operating cycle (K11M with 578 kWh battery and the 2×150 kW (200 hp) axle).[44]: 15, 97 

The drivetrain uses an in-hub motor and reduction gear for each wheel on the drive axle. At least three distinct axles are offered:

  • 2×90 kW (120 hp) and 2×400 N⋅m (300 lbf⋅ft) (K7, K8, K9)
  • 2×150 kW (200 hp) and 2×550 N⋅m (410 lbf⋅ft) (K8, K9)
  • 2×180 kW (240 hp) and 2×1,500 N⋅m (1,100 lbf⋅ft) (K9, K11)

Solar panels fixed on the vehicle were once reported to supplement the onboard batteries. They were included on demo units, but not on units sold commercially.

Safety

Safety features include unitary construction body, 4-wheel disc brakes, ABS+ASR, one-step easy-pass with special footplates for wheelchair access and non-step inside.

Body and interior design
BYD electric bus interior in Germany.
BYD electric bus driving cockpit in Shenzhen.

The body comes silver, yellow or green (for different markets). In the silver version the front windscreen occupies two-thirds of the front of the bus for maximum visibility.[37] It includes adjustable leather seating for driver and red and black leather seats for passengers.[36] The battery packs are laid in the vehicle rear on both sides inside the two cabins.[45]

Costs

BYD calculates that a BYD ebus over 8 years saves about $190,000 in energy costs.[46] In 2012, the price for a BYD ebus was €380,000 Euros, €100,000 more than a comparable diesel bus.[47]

Evaluations and comparisons

To qualify for federal subsidies in the United States, heavy-duty transit buses must be assembled domestically (under the requirements of the "Buy America Act") and pass durability testing for an accelerated equivalent 12-year period at the Pennsylvania Transportation Institute in Altoona, Pennsylvania. To meet these requirements, BYD has opened a bus production facility in Lancaster, California in 2013[48] and K7 (2017),[41] K8 (2021),[42] K9 (2014),[43] and K11 (2020)[44] buses have been tested at Altoona.

In addition, LADOT[49] and Long Beach Transit[50] have conducted long-term comparison tests between BYD battery-electric buses and similarly sized buses fueled with compressed natural gas. In general, the BEBs were more efficient than the CNG buses, with energy consumption measured approximately 1.12–1.13 kW⋅h/km; 4.0–4.1 MJ/km (1.81–1.82 kW⋅h/mi),[49]: 1 [50]: 18  equivalent to 20.7 mpg‑e (163 kW⋅h/100 mi) (diesel gallon equivalent);[50]: 18  the consumption of the CNG buses was measured at an equivalent 9.67 kW⋅h/km; 34.8 MJ/km (15.56 kW⋅h/mi)[49]: 1  or 3.49 mpg‑e (970 kW⋅h/100 mi) (diesel gallon equivalent).[50]: 18  It was noted that consumption increased during summer months, presumably due to the use of air conditioning systems.[49]: 3  In addition, the BEBs were less reliable, being taken out of service more often than the CNG buses[49]: 4  and requiring more frequent roadcalls over a shorter distance traveled; the mean distance between roadcalls for the Long Beach BYD evaluation fleet was 6,830 km (4,244 mi), compared to 24,169 km (15,018 mi) for the CNG comparison bus fleet.[50]: 24 

Policies

At a press conference in Beijing on 4 November 2012, BYD announced "Zero vehicle purchase price, Zero costs, Zero emissions", to promote the sale of its e6 and K9. The initiative is supported financially by China Development Bank from a fund totalling over 30 Billion RMB ($4.6B USD), and allows buyers to finance 100% of the purchase price with no down payment, paying a lease rate that effectively costs less than regular monthly operational expenses.[51][52]

Under the scheme, available in China,[52] public transport operators can choose the ownership model from three different options:[53][54]

Model Financing body Lease period Ownership
Financial LeaseFinance CompanyA complete operational life cycle (e.g. 5 years)During the lease period, the financial organization owns the vehicle. The taxi company pays the lease in installments. After the lease period ends, the taxi company owns the vehicle.
Operational LeaseThird party vehicle lease companyA complete operating life cycle (e.g. 5 years) or a shorter period (e.g. 1 year)During the lease period and thereafter, the vehicle lease company owns the vehicle. The taxi company and the vehicle lease company sign an operational lease contract.
Buyer's CreditThe Taxi CompanyThe taxi company owns the vehicle. The taxi company pays monthly installments to the financial institution.

The company explained the concept of "Zero Costs" by comparing difference between the five-year cost of running a conventional taxi in Shenzhen, as against its all-electric taxicab. It came to the conclusion that "if the car runs for 5 years, and the total saving over 5 years is deducted from the higher cost of the vehicle and the interest on multiple payments, it can save 326,400 RMB.[52][53][54] The company also claimed that if enough distance is covered, "the vehicle payment will be entirely offset".[52] BYD also promoted the "Zero Emission" feature of its renewable-energy vehicles by stating that "an e6 electric taxi saves 14,120 litres of fuel per year, with 32 tonnes fewer CO2 emissions", and "169 million litres of fuel could be saved with CO2 emissions reduced by 38.62 million tonnes per year" if all Chinese taxis were to be replaced with its electric vehicles.[53][54]

Global deployment

Worldwide

In both 2011 and 2012, BYD obtained orders from amounting to 1200+ units.[55][56][57][58] More than 200 K9s in service in Shenzhen had accumulated over 9,216,000 km (5,727,000 mi) by the end of August 2012.[5][40]

In 2015, BYD sold about 6,000 of these buses worldwide.[59] BYD became the world leader in the sale of electric vehicles in 2015.[60]

Mainland China
  • 200 units were delivered to the Shenzhen public transmit system to serve the Universiade 2011 in August, 2011 and remained as part of this city's transport system. This (world's largest) electric bus fleet had reportedly accumulated over 9,216,000 km (5,727,000 mi) by the end of August 2012.[5][40] By 2017 the fleet had increased to 780, covering more than 106,000,000 km (66,000,000 mi).[61]
  • 2 buses began trial service in Changsha 100 more were expected to begin service there in 2012. BYD's Changsha facility was to produce 20,000 passenger vehicles and 400 pure electric buses, increasing to 3,000 electric buses and 100,000 passenger vehicles in 2013.[9][62]
  • 3 K9s began service in Shaoguan, Guangdong province on November 3, 2011.[6][63]
  • 4 K8s began service in Xi'an in August 2012 with another 46 units expected to join them around the end of 2012.[6][8]
  • Haikou City began testing K9s in August 2011.[64]
  • In July 2012 BYD and Tianjin Public Transportation Group Ltd agreed to set up a joint venture to produce new energy vehicles.[57][11] It became the company's second K9 production site in mainland China.
  • The largest K9 fleet since 2014 was in Dalian, 600 units. A further 600 vehicles was planned to arrive in 2015.[65]
  • In May 2014 BYD announced an order of 2000 ebuses and 1000 eTaxis for Hangzhou. As of 2014 China about 500,000 conventional city buses were in daily use. BYD sold in 2014 in the first quarter more than 4,000 vehicles, while sales of former market leader Daimler dropped by 20% in 2013.[66]

North America
A North American-spec BYD bus with Stanford Marguerite Shuttle.

In the North American transit bus market, the K-series bus is sold with several different nominal lengths, powertrain options, and battery capacities.

A North American-spec BYD bus in New York City with MTA Regional Bus Operations.
A BYD K9M eBus with roof fairings owned by the Toronto Transit Commission.

South America
BYD K9 electric bus in Rio de Janeiro
BYD K9 bus in Santiago, Chile
  • On June 20, 2012, BYD and Chilean collaborator Indumotora Company secured a contract with Alsacia, one of the biggest operators in Santiago's public transport system, for 5 K9 units.[85] However up to now, Metbus, another operator of Santiago's public transport system, operates two BYD K9FE units.
  • BYD scheduled a large commercial operation of its K9 in Brazil and set up a bus production factory there which, however, is not certified by BYD. The mayor of Sao Paulo, Brazil confirmed plan to introduce at least 5 BYD electric buses to Sao Paulo by the end of 2012.[86]
  • At the beginning of 2012, BYD and Buquebus officials signed a contract to begin importing 500 buses into Uruguay. According to Bernama, the first buses would arrive in Uruguay before during 2012 with 500 buses running by 2015.[56][57]
  • BYD entered a fuel-efficiency testing program in Colombia run by the Clinton Climate Initiative (CCI) and InterAmerican Development Bank (IADB). Running against diesel and CNG-hybrid buses on a 12-mile route that took between 60 and 90 minutes to complete, BYD won by achieving a 7.3 km/liter-equivalent by measuring costs and 11 km/liter-equivalent measuring by energy output. Peru has also tested BYD's electric bus.[87] A fleet of 12-meter 80-passenger units was to be delivered to Bogotá for trial operation as of Q2 2013. The first one-month stage of this project was to focus on testing the fleet on operational performance, energy consumption, battery behavior and total energy consumption.[88] BYD has delivered 800 units as of sep-2022 and is expected to deliver 1002 units.[89]
  • In December 2018, 100 units were added to the public transport system of Santiago de Chile, together with the first charge terminal for electric buses in Latin America.[90]
  • On 19 May 2020 twenty BYD New K9 units were presented in Uruguay´s capital Montevideo by its biggest bus service operator CUTCSA, these 20 units were bought for specific use in three electric bus exclusive bus lines CE1(shared with two other operators in a 80%,10%,10% division), DE1 and E14 and were adquiered with national funding; they were presented with presence of both municipal and national authorities[91]

Asia Pacific
A BYD battery-run electric bus on Rapid KL.
A BYD express bus in Kyoto.
A BYD battery-run electric bus operated by Go-Ahead Singapore. It ran as part of a trial from November 2016 til May 2017.
A Korean registered BYD K9 on service 7713
TransJakarta BYD electric bus.
  • Hong Kong: In July, 2011, the BYD Hong Kong Research and Development Center opened with a group of six engineers, in cooperation with its existing development team. The Kowloon Motor Bus fleet reportedly ordered 10 buses from BYD. The first unit arrived in September 2012. The public transit service planned to test the units on three transmit lines. The Kowloon Motor Bus BYD bus was eventually returned to BYD. However, KMB ordered 10 BYD K9R with Gemilang body and delivered in 2017. Long Win Bus ordered 4 BYD K9R with Gemilang body and delivered in 2017. Citybus and NWFB ordered 5 BYD K9R Electric buses from BYD Auto of China.[92][93]
  • India:
  • Malaysia: In February 2014, BYD won the bid to supply 15 buses to Rapid Bus, a Prasarana Malaysia subsidiary. Rapid Bus will be using the 15 electric buses as shuttle buses on Kuala Lumpur's first BRT line on elevated guideway exclusively for electric buses namely BRT Sunway Line.[99][100] It is world's first all-electric Bus Rapid Transit system.[101] Since April 2022, some of the buses are also used at normal bus routes.[102]
  • Thailand: On 2015, BYD will deliver K9RA buses. It will be available through the official BMTA has partnered with Loxley Plc.
  • Philippines: In May 2018, BYD announced it will deliver ten buses to the Philippines. It will be available through the official Philippine distributor Columbian Motors Corporation (CMC) sales network.
  • Japan: In February 2015, Kyotokyukou Bus Inc. of Kyoto, Japan, took delivery of five BYD electric buses, making BYD the first Chinese auto company to enter the Japanese market.[103]
  • Singapore:
    • SMRT Corporation, Singapore's premier multi-modal transport service provider signed an MOU in June 2011 with BYD to consider a joint venture to distribute BYD's electric buses and e6 taxis in Singapore.[104][105]
    • Go-Ahead Singapore together with Land Transport Authority delivered its first fully electric bus. It will undergo vigorous testing and be put to service for trial runs for six months. The bus made its debut on 7 November 2016 on Service 17.[106] After that, it went on hiatus, before coming back on Service 119 on February.
    • In 2019, the Land Transport Authority of Singapore ordered 20 BYD K9 with Gemilang body. An initial five entered service on 29 July 2020, with all remaining buses entering service by November 2020.[107][108]
    • In May 2022, BYD offered the Land Transport Authority of Singapore BYD K9RC, a double deck Gemilang Body Bus as part of a trial. It entered revenue service on 4 July 2022 with SBS Transit
  • South Korea: In September 2020, BYD won an order for 18 units in the electric bus supply business for Seoul city buses. Delivery started from December 2020.[109]
  • Indonesia:
    • In April 2019, TransJakarta took pre-trial on some electric buses company, including BYD K9 and C6.[110]
    • In July 2020, TransJakarta took trial run on K9 and C6 for public with free of charge for three months.
    • In March 2022, Mayasari Bakti operates 30 units for TransJakarta in non-BRT routes[111]

Oceania
A BYD K9RA bus of Transit Systems NSW in Sydney
  • NZ Bus is trialling a BYD eBus for up to three months in Auckland and Wellington from February 2017.[61]
  • Brisbane Airport purchased several modified BYD K9 (with three doors) for shuttle service between domestic and international terminals, starting from 2019.
  • Transit Systems NSW acquired four BYD K9RAs bodied by Gemilang as part of an electric bus trial for 2 years, commencing in July 2019.[112] The fleet now operates over 40 electric busses.[113]

Middle East
  • In August 2012, a contract for 700 electric bus delivery was completed between BYD and Israeli transit company Dan Bus. The first buses were expected to be deployed in 2012. Based on the market price of 2.1 million yuan (US$330,000), the contract is estimated to be worth 1.5 billion yuan (US$236.65 million). The contract was BYD's largest order to date from a public transport operator outside of China.[55][58]

Europe

BYD electric bus has been tested in European countries including Denmark,[5] Finland, Germany, Hungary Italy, the Netherlands, Portugal and Spain[114] in cities such as Bremen and Bonn, Helsinki, Coimbra,[115] Amsterdam, Copenhagen, Milan, Madrid, Barcelona,[116] Athens[117] and Warsaw.[118]

  • Finland: on March 12, 2012, BYD and a Finland-based transportation company, Veolia Transport Finland Oy, reached an agreement for K9s for the Finnish capital city Helsinki. BYD's K9 buses were to undergo a three-year performance test under Finland's conditions of extreme cold.[119]
  • Germany: BYD signed a letter of intent with Frankfurt, Germany to supply three K9s and two charging stations by the end of the first quarter of 2012. The buses were to serve as shuttles at Frankfurt Airport and along public transportation routes.[120] In October 2020, BYD supplied 22 of K9s for BOGESTRA and HCR in the city of Bochum, Gelsenkirchen and Herne.
  • Italy: in 2014, ATM, got two K9s for test the electric bus in Milan.
    In 2015, the Piedmont Region, issued the first Italian tender for full-size ebuses, won by BYD: in October 2017 the buses began operating, 20 buses were delivered to GTT for Turin city routes and 3 buses were delivered to SUN for Novara city routes.[121]
    In 2018, 4 K9s were delivered to Busitalia, a FS Group company, the Padua city bus operator.
  • Netherlands: the island of Schiermonnikoog in the province of Friesland introduced six new, long-range, K9s in April 2013 after BYD scored the highest in meeting program goals and won an order for the six buses and a 15-year maintenance contract from a European open bid supported by four major bus manufacturers.[122]
    35 BYD K9s are in service as airportbus between the terminal and B-gate's at Amsterdam Schiphol Airport since 2015. The busses are adapted for the airport use and charged via a solar powerstation at the airport.
    Several other public transport authorities throughout the Netherlands have BYD K9s on order. In 2020 250 BYD K9s started operating in the eastern Netherlands, it is the largest electric bus fleet in Europe that was implemented overnight.[123]
  • Poland: In 2013 the capital city of Poland, Warszawa (Warsaw), tested K-9. BYD claims about 3 hours of charging time were not confirmed: the minimum was over 5 hours. 250 km range was found, less than the required 350 km.[118] Also, the same buses were tested in Kraków.
  • Spain: A successful two-week road test of BYD electric bus was conducted by the two main Spanish municipal public transportation companies: EMT (Madrid) and TMB (Barcelona).[124]
  • United Kingdom: In 2013 two units began operating on two central London routes; said to be the capital's first fully electric buses. Transport for London planned to purchase six more BYD buses in 2014.[125] In July 2015, Go-Ahead London confirmed they would order 51 BYD electric buses with Alexander Dennis Enviro200 MMC bodywork.[126] In March 2016, the first of a fleet of 5 double decker electric buses was launched by Metroline with an extended range of 190 miles.[127] In 2016, Nottingham Community Transport received a batch for the park and ride services.

Competitors

North America:

Europe:

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