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Solaris at Busworld Kortrijk 2013: ready for Euro 6 and all-day electric operation

 Solaris is ready for Euro 6 with diesel and gas engines from its partners DAF and Cummins  New DAF MX-11 will be standard specification for heavy-duty applications  For midibuses and hybrid , Cummins supplies the ISB diesel engine  Solaris continues to offer a compressed natural gas/biogas option with the Cummins ISLG  From 2014, the next generation of Urbino buses will more than offset any weight increases  electric now with an automatic system for conductive fast charging  Charging system guarantees an operational range similar to conventional diesel buses

(Kortrijk, 17 October 2013) At this year’s Busworld Kortrijk, Solaris presents its expanded offer of solutions for sustainable public transport. Two years after the premiere of the first Solaris , the company unveils further innovations. The electric at the show is equipped with a new automatic roof-mounted system for conductive fast charging. A Solaris InterUrbino 12 with Cummins ISB6.7E6 engine and a with DAF MX-11 unit represent Solaris’s range for the Euro 6 emissions standard.

Solaris: ready for Euro 6

As an independent bus builder, Solaris aims to work in stable and mutually beneficial relationships with its key component suppliers. To ensure that all Solaris buses can be reliably offered across all markets, Solaris will focus on engines from independent suppliers at Euro 6. The company will work with DAF and Cummins. Both of them are long-standing partners of Solaris.

At Euro 6, Solaris uses two different engines for diesel and biodiesel as well as one engine for compressed natural gas and compressed biogas.

DAF supplies Solaris with its completely new MX-11 diesel engine. This 10.8-litre unit was developed as a successor to the reliable and successful PR series, which it replaces in the Solaris product line-up. The new engine has six cylinders with common rail injection at pressures of up to 2500 bar and is turbocharged at variable geometry. It uses exhaust gas recirculation, selective catalytic reduction and a closed diesel particulate filter to achieve Euro 6 emission limits. Power ratings are 210 kW (290 PS), 240 kW (330 PS) and 271 kW (370 PS), with torque output ranging between 1200 and 1600 Nm. The DAF MX-11 will be the standard engine for the low-floor Urbino 12, Urbino 15 and Urbino 18/18.75 as well as for all low-entry Urbino LE buses. It can be specified as an option on the InterUrbino in both available lengths.

The smaller-volume Cummins ISB6.7E6 diesel engine is used in all midibuses as well as all hybrid buses. It is optionally available in the Urbino 12 low-floor city bus and is the standard specification for

 the InterUrbino. Cummins developed this engine from the acclaimed Euro 5/EEV version of the same unit, which had been used by Solaris. In order to meet Euro 6 levels, exhaust gas recirculation, based on Cummins’s North American system for the EPA10 standard, was added together with a closed diesel particulate filter. The main architecture of the 6.7-litre engine, with common rail injection for its six cylinders, remains unchanged. Solaris offers this engine in power ratings of 187 kW (250 PS) and 209 kW (280 PS). On the InterUrbino, a 231 kW (310 PS) option also is available. Torque output is between 1000 and 1100 Nm.

Cummins also supplies Solaris with its 8.9-litre ISLG8.9E6 engine for compressed natural gas and compressed biogas. This is an updated version of the Euro 5/EEV model, which had been the standard gas engine for Solaris buses. There are no significant changes to the design of this engine in order to meet the new emissions standard. The option of this gas engine will continue to be available on the Urbino 12, Urbino 15, Urbino 18/18.75 in both low-floor and low-entry versions. Its power is rated at 238 kW (320 PS) and it delivers 1355 Nm of torque.

In all models fitted with Cummins Euro 6 units, there is no significant weight penalty from the new engines. Against comparably specified Euro 5/EEV buses, the DAF MX-11 engine adds 350 kilogrammes to the total weight of the Urbino and, thanks to more extensive compensation measures, only around 100 kilogrammes to the InterUrbino.

The changes to the InterUrbino include an improved bodyframe structure in the rear of the bus and a new, glued floor made from sandwich panels. In order to improve weight distribution, the batteries have been moved from the rear to underneath the driver’s cab. In buses with DAF engines, the air- conditioning unit has also been moved forward. In the Urbino, only the immediate engine compartment has been modified. Major improvements, which will see the current weight penalty more than compensated, will be made with the introduction of the next generation of Urbino buses, planned for autumn 2014.

With its new line-up of diesel and gas engines, Solaris is ready for the introduction of the Euro 6 emissions standard. Operators will appreciate the continued high levels of efficiency and the stability of the long-term cooperation between Solaris and its engine partners, while the environment will benefit from significantly lower exhaust emissions.

Solaris Urbino electric: ready for all-day electric operation

A new system developed by Solaris ensures fast and fully automatic charging of battery buses and additionally guarantees low operational costs. A roof-mounted connector – the “pantograph” – is automatically raised when the bus approaches a charging station. The external part of the system likewise is ready to start its work as soon as the bus stops. Its connector is mounted under a platform, which is installed above the road and which connects to a stationary DC charger. The roadside infrastructure has been designed for easy installation in existing bus stops or on dedicated support pillars. Upon connecting, electrical grounding is established before the two poles of the charging connection become active and the fast-charging process starts with a power of 200 kW. Solaris's system provides a significant degree of tolerance for the positioning of the bus at the charging station, which ensures that the batteries can be topped up reliably. The roof-mounted connector on the bus has a sideways flexibility of up to one metre, while the length of the station's connector - which gives lengthways tolerance - is at least two metres and can be further extended to suit local requirements.

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This conductive charging system keeps the amount of time necessary to top up energy levels in the on- board batteries as short as possible. Between two and four minutes can be enough to ready the Urbino electric for the trip along the line. The new conductive charging system allows the use of smaller batteries (60-80 kWh), which results in a lower empty vehicle weight and therefore raises the passenger capacity of the bus. The electric bus presented in Kortrijk is equipped with an 80 kWh battery. Accordingly to customers’ requirements, 105, 120, 210 and 240 kWh batteries are also available. This enables operators to choose the specification most suited to their requirements and route demands.

Solaris will also continue to offer two other possibilities to charge the batteries of its electric buses. These are the “plug-in” solution using conventional plug connections, and contactless inductive charging, which allows buses to be charged automatically at bus stops and termini that have been fitted with induction coils under the road surface.

A further option is the use of the ZF AVE 130 drive axle, in which two independent electric motors are mounted in the wheel hubs. It brings down overall weight even further and at the same time increases the space inside the bus that can be configured freely.

With the roof-mounted conductive fast-charging system, the Solaris Urbino electric can reach an operational range similar to that of conventional diesel buses and may accommodate a comparable number of passengers.

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