View source for Enviro500

{{Translation in progress|chi=Enviro500}}
{{Otheruseslist|the series of Enviro500 buses from 2002 to 2012|the [[Volvo B9TL]] buses that use Enviro500 body|Volvo B9TL|the Enviro500 series of buses from 2012 onwards|Enviro500 MMC|the improved version of Enviro500 hybrid bus produced after 2014|Enviro500 MMC Hybrid|the Enviro500 zero-emission electric double-decker bus|Enviro500EV}}
{{Bus Model Infobox
| engname = 亞歷山大丹尼士Enviro500
| name = Alexander Dennis Enviro500
| image = KMB 47X KX675 KWH 20161113.jpg
| caption = [[Kowloon Motor Bus]]' ATE1/KX675 is the first Enviro500 to enter service in Hong Kong
| othername = TransBus Enviro500
| manufacturer = 2002 to 2004: [[TransBus International]]<br>From 2004：[[Alexander Dennis]]
| builtat = Chasis: Guildford<br>Body: Falkirk/Hong Kong/China
| replaced = [[Enviro500 MMC|Alexander Dennis Enviro500 MMC]]<br>[[Enviro500 MMC Hybrid|Alexander Dennis Enviro500 MMC Hybrid]]
| year = 2002 to 2014
| operator = [[KMB]]、[[Citybus]]<br>[[LWB]]、[[MTR Emergency Bus]]／[[MTR Bus]]、[[CLP]] 
| nickname = E500, straight-staircase bus<!--<ref name="straight">"直梯車", "超直巴士" and "笑直" can only be used to describe Enviro500 buses equipped with straight stairs. Those equipped with curved stairs are called "假直".</ref>、鐵甲威龍、<br>食咗<ref name="ate">"食咗" comes from the fact that Enviro500's fleet number in KMB is ATE, and the past tense of eat is also ate; therefore, "食" is limited to describing KMB's EU III Enviro500 buses.</ref>、超直巴士<ref name="straight" />、笑直<ref name="straight" />、Laughing哥、鐵甲-->
| length = 11.3m, 12m
| height =
| width = 2.51m
| weight = 23500kg
| floor = [[Low-Floor Bus]]
| chassis = Trident E500 and partially of a [[Volvo B9TL]]
| engine = [[Cummins]] ISMe-335 (Euro 3)<br>[[Cummins]] ISLe-340B (Euro 4)<br>[[Cummins]] ISL8.9E5340B (Euro 5)
| powerout = Euro 3: 335hp<br>Euro 4/5: 340hp
| transmission = Voith DIWA 864.3E<br>Voith DIWA 864.5<br>ZF Ecomat 2 5HP602C<br>ZF Ecomat 4 6HP604C
| PT =
| door =
| body =
| motor =
| battery = c
}}

The '''Enviro500''' (commonly known as '''E500''') is a three-axle double-decker low-floor bus launched by the British company [[TransBus International]] in 2002. It replaces the three-axle version of the [[Dennis Trident]] and is one of the "Enviro" series. Since May 2004, the manufacturer has been reorganised and renamed [[Alexander Dennis]].

==Design==
===The first and second generation Enviro500s===
Enviro500's [[chassis]] (also known as "Trident E500" at the time <ref> according to the water brand in the car </ref>) was improved from Trident 3 (three-axle version [[Dennis Trident]]) and can be equipped with [[Cummins]] ISMe-335[[EU emission standard|EU Phase III]] engine, ISLe-340[[EU Emission standard|EU Phase IV]] engine or ISL8.9E5340B[[EU Emission standard|EU Phase IV]] engine Phase 5]] Engine, and Voith DIWA 864.3E (fourth generation DIWA) four front speed or ZF Ecomat 2 5HP602C (second generation Ecomat) five front speed gearbox (after the gearbox computer program was modified, the band was changed to six front speed).In terms of axles, Enviro500 uses the Dana axle used by [[Dennis Trident]], which is 22.5 inches outside of stainless steel, so it can be matched casually (because its tire size is still 305/70R 22.5).

Since 2003, it can also be equipped with Voith DIWA 864.5 (fifth generation DIWA, can be equipped with SensoTop function) four front speed or ZF Ecomat 4 6HP604C (third generation Ecomat, can be equipped with TopoDyn function) six front speed gearbox.In addition, Cummins engines that meet [[EU emission standards|EU Phase IV]] or above standard buses need to be filled with [[AdBlue]]([[urea]]) due to the addition of [[selective catalytic reducer]] ([[New World First Bus]].  and [[Citybus]] are called "[[Arpels]]", [[KMB]] and [[Longyun Bus]] are called "[[Ammonia solution]]") to reduce the content of nitrogen oxides in the exhaust gas.

The body of Enviro500 uses aluminum alloy brackets and side panels, as well as a large number of glass fiber components.The body design is based on the improvement of Enviro300. The design of the front of the upper body is similar to that of the Plaxton President body, and the width of the body is 2.51 meters. Therefore, you need to apply for an exemption permit during [[Vehicle inspection]] to comply with this restriction before you can serve in Hong Kong.In late 2005, the factory launched the modified Enviro500 body (hereinafter referred to as the "'KKII"' body). The changes mainly appeared in the front and rear of the body.Since 2007, the [[captain]][[cab]] dashboard has been redesigned to match the introduction of the Logena Automotive driving computer system. There is an electronic display in the center of the dashboard, and the hazard warning light at the rear of the upper car has also been slightly modified.Since 2009, the upper front [[TV component]] has begun to appear (this is an additional item).Since 2010, the left and right sides of the body have been slightly modified, and the size and shape of the air-conditioning and cooling tank vents have been changed. Each vent is equipped with two buttons to open the vent and open the door. The distance between the vents is also relatively wide (therefore, it is necessary to add a small hole-shaped barbed wire).Since 2011, in response to [[Citybus NWFB Telargo station reporting system|Automatic station reporting system adopted on a large scale by New buses and Citybus]], a protective cover has been added to the roof of the car to cover the GPS automatic station reporting system and GPRS transceiver antenna.

Enviro500 body can also be installed on the [[Volvo B9TL]] chassis. At present, only [[KMB]] in Hong Kong is equipped with the Euro III engine model [[Volvo B9TL]] ({{KMB-bm|AVBE}}) and all of [[LWB]]'s [[Volvo B9TL]]s ({{KMB-BM|401|7XX}}) with the Euro III engine model ({{KMB-BM|401|7XX}}).The Dublin Bus Company in Dublin, Ireland, also adopts a similar combination, divided into two batches. The chassis of the bus is equipped with the EU Phase III (a total of 20 vehicles) and the EU Phase IV engine model (a total of 50 vehicles).

In terms of length, Enviro500 body was initially only available in a 12m-long version. Since 2007, a 12.8-meter version has been launched for the US and Canadian markets. In 2008, an 11.3-m version was launched in response to the requirements of [[NWFB]]. The Enviro500s currently operating in Hong Kong are 11.3m or 12mversions. Among them, the 11.3m version with MKII body is currently only used by [[NWFB]] and [[MTR Bus]].

In order to enter the North American market, [[Alexander Dennis]] cooperated with the ElDorado National Assembly Plant in California to move some processes to the local area to comply with the U.S. government's "Buy America" (priority purchase of domestic goods) regulations. At present, the University of California, Davis Student Union (Unitrans), Hele-On Bus (Hawaii), and the British Columbia Transportation Authority of Canada (BC Transit, Vancouver and Kelowna), OC Transpo (Ottawa), GO Transit (GO Transit, Toronto) and many other bus companies have introduced E500, which is the only double-decker bus that has passed the 12-year Altoona test program <ref>http://www.alexander-dennis.com/alexander-dennis-incorporated.php?s=77&subs=39 </ref>. New York Gray Line Tours, Washington Big Bus Company <ref>[https://www.youtube.com/watch?v=jlUJhpQu1Fo Big Bus Tours Washington DC-Open-Top Sightseeing Tour Video],{{evchk|YouTube}}.</ref> and other sightseeing bus companies have also purchased the [[open-top bus|open-top]] version of the E500 to serve as a sightseeing bus in the city.
===Third generation Enviro500=== 
Since 2012, the [[chassis]] and body of the Enviro500 have been significantly improved and launched under the new name of "[[Enviro500 MMC]]". See the article "'''[[Enviro500 MMC]]'''" for details.
[[Category:Buses]]
[[Category:Alexander Dennis|Enviro500]]
[[Category:Dennis Buses|Enviro500]]
[[Category:Double-decker buses]]
[[Category:Hybrid electric buses]]
[[Category:Enviro500]]

[[zh:Enviro500]]

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