Exhaust gas treatment system for off-road vehicles connect to CAN bus

November 08, 2011 // By Christoph Hammerschmidt
Bosch Emission Systems has introduced solutions tailored to the requirements of the agricultural sector. The focus is on systems to reduce nitrogen oxides and particulate matter – systems that are not only highly efficient but are also especially compact and make optimum use of the installation space available, which is often very limited.

Set up by automotive electronics supplier Bosch, engine manufacturer Deutz and exhaust technology provider Eberspaecher in April 2010, Bosch Emission Systems is expanding its portfolio of exhaust gas treatment systems. Using a modular kit means that a complete systems solution for effective exhaust-gas treatment can be integrated quickly and simply. “The company said the systems aim at forklifts, construction vehicles, tractors, and other agricultural machinery, as well as stationary The system can also be used in on-road applications such as buses and municipal vehicles.

Thanks to compact design and other new developments, the systems are flexible enough to be adapted to individual needs. The systems provide a stand-alone solution – they have their own sensors and actuators. An integrated control unit makes the systems diagnostic-capable. The modules available, which have to be certified in consultation with the respective engine manufacturers, cover diesel engines in the power range from 19 to 560 kilowatts.

The nitrogen oxides of diesel engines are reduced via a Denoxtronic system, which injects the reducing agent AdBlue into the exhaust gas flow. Precise metering ensures that there is always exactly the right amount of agent for the operating values of the engine and SCR catalyst. A major new development is a spiral-shaped mixing section, which enables the optimum mixture of the AdBlue. This makes it possible to reduce nitrogen oxides by up to 95 percent. At the same time, fuel consumption, and in turn CO2 emissions, can be reduced by up to five percent. As a result of nitrogen oxide treatment in the exhaust tract, the combustion process can be optimized with regard to fuel efficiency. For large engines, Bosch Emission Systems has further developed the Bosch Denoxtronic system. By cleverly combining the supply and dosing modules, as well as adapting the metering system, larger volumes of reduction agent can be precisely dosed. The system as a whole is governed by a central exhaust gas control unit.