The enhanced environmentally friendly vehicle (EEV) standard is a step beyond the Euro V regulations and is still optional. Requiring 30 percent lower emissions, EEV is the toughest standard currently in force in Europe.
Mercedes already makes an EEV version of the Citaro bus that uses DPF and SCR after-treatment systems. The upgraded version uses a new fuel injection system for improved combustion in the cylinder that doesn't produce the pollutants to the same degree, thus eliminating the need for the extra hardware.
The new EEV buses are less expensive for operators to buy, require less maintenance and use less fuel. The fact that Mercedes was able to optimize an engine to meet the standard without all the expensive extra hardware may be a sign that there is still room for improvement in cars – and perhaps that we'll get more diesel vehicles in the U.S. market.
Mercedes-Benz buses meet EEV emissions standard without diesel particulate filter
- Environmentally-friendly Mercedes-Benz bus range
- Benefits for transport operators and private companies
Mercedes-Benz Citaro with EEV now also available without diesel particulate filter
Although the Mercedes-Benz Citaro city bus family already featured an EEV version, this was only available in conjunction with an additional diesel particulate filter. The new EEV technology without diesel particulate filter, meanwhile, provides operators a number of significant benefits compared with the previous solution. On the one hand, the cost of acquisition is lower, since no additional expense is incurred for the diesel particulate filter. On the other, maintenance costs are also reduced due to eliminating the need to clean the particulate filter, thus in turn increasing the availability of the bus for service operations. Fuel consumption may also be lower due to reduced exhaust gas backpressure. Thanks to the new EEV technology, the kerb weight is lower too, and, in the case of the Citaro, operators benefit from gaining additional space for three more seats.
Touring coaches now also come with EEV
A completely new development is the availability of EEV versions of Mercedes-Benz inter-city buses and touring coaches without diesel particulate filters. Previously the products on offer included Euro 5 engines in the inter-city bus and touring coach range. The new EEV range of products brings with it additional benefits for operators. Companies will be able to own an environmentally-friendly vehicle for only a slight extra cost, and at the same time will be able to make positive use of it as part of their marketing strategy. The purchase of an EEV vehicle helps to promote environmental protection without resulting in an increase in fuel consumption and therefore CO2 output. A final point, but by no means one to be underestimated, is safeguarding access into major European cities and conurbations in the medium and long-term. Furthermore, incentives may also be possible in transit countries, such as Austria for example, where reductions in road tolls may be available.
The technology to fulfil the optional EEV emissions standard is based on Mercedes-Benz BlueTec 5 diesel technology, together with the installation of a number of additional technological details. Basically the fuel injection has been changed, and the injection nozzle, piping and mounting systems redesigned. Additional exhaust gas aftertreatment via SCR is not necessary. In terms of maintenance, service life, fuel consumption and weight, the EEV solution for Mercedes-Benz buses is on a par with established BlueTec 5 technology.
EEV engines in Mercedes-Benz buses
The new EEV engine technology without additional exhaust gas aftertreatment via SCR is available for the OM457 hLA/LA and 926 LA engines.