Cel mai mare autobuz hibrid
Mercedes a facut primele demonstratii publice cu un autobuz hibrid Citaro G BlueTec. Mai mult de 250 de clienti din 15 tari au avut recent posibilitatea sa experimenteze transportul cu autobuzul articulat Mercedes-Benz Citaro G BlueTec Hybrid. Autobuzul are o lungime de 18 metri, capacitate mare de transport, stocheaza curentul electric produs de motorul diesel si recupereaza energia pierduta la franare.
Consumul de motorina a fost redus cu 30% la fel ca si emisiile de dioxid de carbon. Motorul diesel, cu o capacitate cilindrica de numai 4.8 litri, transmite energia mecanica unui generator electric. Acumulatorii litiu ion, cei mai mari din lume ce au fost montati pe un vehicul, stocheaza energia electrica generata de motorul diesel si o transmite atunci cand e necesar celor patru motoare electrice ce pun in miscare vehiculul.
Puterea totala cuantifica 320KW (429 cai putere) suficienta pentru un autobuz articulat de oras. In varianta clasica un autobuz de acelasi dimensiuni este motorizat de un propulsor cu sase cilindri in linie si 12 litri. In ciuda sistemelor ce par mai complexe la prima vedere greutatea motorului este redusa de la 1000 de kilograme la numai 450. Acumulatorii litiu ion sunt montati pe acoperisul vehiculului, genereaza 180KW si cantaresc 350 de kilograme.
Costurile de exploatare ale autobuzului hibrid nu au fost facute publice insa odata la cinci ani acumulatorii vor trebui in mod sigur schimbati. Un autobuz diesel-electric are avantajele sale fata de un model cu transmisie si cutie de viteze. Elementele transmisiei si cutia de viteze cantaresc destul de mult fapt care se reflecta in cost si in consumul de combustibil. Autobuzele moderne din aluminiu si elemente din plastic impreuna cu motoarele diesel performante gestionate electronic reusesc sa fie mult mai prietenoase cu mediul inconjurator.
Mai jos puteti gasi comunicatul de presa Mercedes-Benz (in limba engleza):
New Mercedes-Benz hybrid bus in operation
* 250 customers test the Mercedes-Benz Citaro G BlueTec Hybrid city bus
* World’s largest lithium-ion battery in vehicle operation
* Diesel consumption and CO2 emissions reduced by up to 30 percent
* Citaro G BlueTec Hybrid – future-oriented technology for the city
* 40 years of Daimler hybrid buses
More than 250 customers from 15 countries recently had the opportunity to experience at first hand the Mercedes-Benz Citaro G BlueTec Hybrid articulated bus in operation for the first time. Experts from European transport operations praised a number of features of the 18-metre long hybrid city bus, including its completely emission-free operation on some stretches of the route, its quiet, practically jerk-free drive system, its unique vehicle concept incorporating four electric wheel hub motors, and also its use of the world’s largest lithium-ion vehicle battery. This battery stores the energy from the diesel generator and the electrical energy recuperated during braking.
As a result the Mercedes-Benz Citaro G BlueTec Hybrid reduces diesel consumption by up to 30 percent, with a commensurate reduction in highly topical CO2 emissions. The new hybrid bus has successfully completed extensive practical trials over recent months, including several weeks of winter trials under extremely tough operating conditions near the Arctic Circle. The first vehicles will be delivered to the transport operators before the end of this year. Given appropriate public sector support for hybrid technology, market insiders expect a potential annual demand for at least 300 hybrid buses in western Europe, which would enable diesel fuel consumption, CO2 emissions and pollutant emissions in the cities to be drastically reduced. In North America the Daimler bus brand Orion already has 1700 hybrid buses in day-to-day operation, which makes it the world market leader for hybrid technology in commercial vehicles.
Mercedes-Benz Citaro G BlueTec Hybrid
The Mercedes-Benz Citaro G BlueTec Hybrid has a technologically very sophisticated, serial hybrid drive system which allows emission-free driving under battery power alone over short distances. The drive system is installed in an articulated Citaro G bus, and drives the centre and rear axles by means of four wheel hub motors – a combination that makes this articulated hybrid bus unique.
The diesel engine in the serial hybrid bus does not act as a primary drive unit, but rather drives the generator to produce electric power as required. This energy is stored by maintenance-free lithium-ion batteries mounted on the roof. The batteries are not only fed by the diesel generator, but also with energy recuperated during braking.
The energy generated by recuperation when braking on the approach to bus-stops or traffic lights is used both to supply the vehicle at standstill and when moving off. This means that the hybrid bus is able to operate purely under electric power, and therefore practically without emissions, when stationary and under acceleration – with a significant reduction in noise as well.
Power is transferred to the wheels of the Citaro G BlueTec Hybrid by four electric wheel hub motors on the centre and rear axles. Even under heavy operating conditions, the 320 kW total output of the wheel hub motors is ample for an articulated bus.
Downsizing is among the greatest advantages of the serial hybrid system in the Citaro: instead of the large, 12-litre six-cylinder in-line engine normally employed in an articulated bus, a more compact unit with a displacement of 4.8 litres is used. As a result the engine weight is reduced from around 1000 kg to just 450 kg or so.
World’s first lithium-ion battery in this output category
The lithium-ion battery used in the articulated Citaro G BlueTec Hybrid is in an output category of its own. The battery system generates 180 kW and is com para tively light in weight at under 350 kg. Major advantages over con vention nal battery systems include a higher energy density combined with a high storage capacity and a low battery weight.
Changes in the automobile industry are increasing the demand for clean, efficient and economical vehicles. According to forecasts, the market volume for powerful lithium-ion batteries is set to exceed the 10 bill. euro mark over the next decade, with the market for battery materials exceeding 4 bill. euros. In Germany alone, the government envisages at least one million electric cars populating the roads in the cities by 2020.
40 years of Daimler hybrid buses
With diesel-electric hybrid vehicles from Orion in North America, Mercedes-Benz in Europe and Mitsubishi Fuso in Asia, Daimler not only has the longest, but also the most extensive experience with alternative drive systems for commercial vehicles. The new Citaro with hybrid drive is a major step towards great economy and emission-free driving. Despite fuel savings of up to 30 percent, this complex hybrid technology nonetheless requires incentive financing. The support of politicians and the public sector in the form of subsidies is required to make the one-third higher costs for this technology in large-scale production worthwhile for both customers and manufacturers.
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