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Bosch makes trucks cleaner
With the new SCR (Selective Catalytic Reduction) technology, utility vehicles will produce even lower emissions and consume less fuel.Bosch has developed the key element of this eco-friendly technology: the DENOXTRONIC reducing agent metering unit. It permits a significant reduction in nitrogen oxide and particle emissions while also reducing fuel consumption compared to other EURO V applications. It therefore already observes the boundary values to be set under the forthcoming EU emissions standards.  

For people and the environment

For people and the environment

Utility vehicles in continuous use can cover several hundreds of thousands of miles in a very short time. Existing emission treating systems are quickly pushed to their limits under such strain. To reduce both emissions and fuel consumption, new exhaust gas treatment processes are needed. Bosch is playing a central role in their successful development.

How DENOXTRONIC works
The SCR process involves adding the reducing agent AdBlue (32.5% urea-water solution). It is a harmless, odorless chemical substance. A low-lift pump induces the AdBlue into a specification controlled metering valve that mixes the required amount with air in a mixing chamber. A diffusion facility induces the aerosol into the exhaust gas before reaching the SCR catalytic converter. After its induction, the reducing agent is initially converted into ammonia and carbon dioxide. In the second stage, the nitrogen oxides in the exhaust gas react with the ammonia to produce water and nitrogen.

To achieve maximum cleaning performance, it is vital for the amount of AdBlue reducing agent always to be adapted to the engine and catalytic converter's operating status. The control device in the DENOXTRONIC system performs this task. Data measured in the engine control unit and the exhaust pipe are used to recognize the requirements in any operating condition so as to adapt the reducing agent dose accordingly.

DENOXTRONIC can reduce nitrogen oxide emissions by up to 85% and particle emissions by up to 40%. The engine concept can thereby be shifted towards "economic" levels to achieve fuel consumption that is 5–10% lower than other EU IV applications.


Investing in the future
Investing in the future

The DENOXTRONIC system can easily be integrated as original equipment into all SCR catalytic converter concepts. The system operates reliably and needs almost no maintenance apart from the usual filter changes. DENOXTRONIC is ready for the on-board diagnostics prescribed for 2005 and can therefore be easily integrated into the vehicle concept. The increased purchasing price of a vehicle with an SCR catalytic converter pays off through significantly lower fuel consumption. With 5–10% less fuel consumption than other Euro IV applications, the price difference is saved after only 110,000 to 360,000 km.

DENOXTRONIC proved to be robust and reliable in a completed test phase that lasted several years. With the forward-looking DENOXTRONIC system, Bosch makes a further important contribution to a cleaner environment.
The heart of DENOXTRONIC
The specification controlled metering module of the Bosch DENOXTRONIC system ensures that the right amount of the AdBlue reducing agent is always induced into the exhaust gas. AdBlue converts the toxic NOX gases into harmless gas in the catalytic converter.
 
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