New vehicles and engines
The most effective way to use catalyst, filter and adsorber technologies is as part of an integrated system on a new vehicle.
This allows the system to be designed as a complete, optimised unit, with the vehicle’s calibration set to give the best performance under each individual operating condition in the ‘map’ contained in the vehicle’s engine control unit (ECU). Exhaust gas aftertreatment technologies can then complement, where appropriate, mechanical measures such as improvements to fuel management and the combustion process.
The technology pages show the range of catalysts, filters and adsorbers that are available. Some are only appropriate for particular types of engines (for instance three-way catalysts are only used with petrol engines) but all can be used in a variety of vehicle and machinery applications.
Those applications are not limited to cars or buses. The range of applications is huge, from small, hand-held equipment such as grass trimmers and chainsaws, through motorcycles, cars, delivery vans and trucks and buses to excavators, agricultural tractors, railway locomotives and ships.
Retrofitting catalyst systems
A number of existing vehicles can be retrofitted with catalytic converters, diesel particulate filters (DPFs) and Selective Catalytic Reduction (SCR) systems. Tax reductions or vehicle-use restrictions have provided the incentive and diesel retrofit technologies have demonstrated their ability to significantly reduce unwanted emissions at reasonable costs without jeopardizing vehicle or machine performance.
A range of catalytic converters – including the necessary fuel and engine controls to make them work reliably – are available in markets with incentive schemes for a wide range of heavy-duty vehicles and non-road mobile machinery. Many thousands of trucks and buses have been engineered to reduce particulate or NOx emissions and to meet future EU emissions standards by adding a particulate trap or SCR system.