Upcoming Emission Regulations for Passenger Cars : Impact on SCR System Requirements and Developments

Joël Op de Beeck; James Thompson; Neall Booth

doi:10.4271/2013-01-1072

Passenger Car and SUV Selective Catalytic Reduction (SCR) systems were first introduced to the market in 2008. These systems were developed to meet the stringent LEV-II Tier 2 Bin 5 exhaust emissions regulation in US and EURO 6-1 regulation in Europe. New emission regulations are being proposed. For Europe EURO 6-2 is about to be defined and will start to apply in 2017. In US, LEV-III SULEV requirements phase in from 2015 to 2025 and are mandatory for all vehicles starting in 2020.

These amendments generate a new evolution of requirements for automotive SCR systems:

A first effect of this evolution is that the most efficient NOx reduction technology, combined with more efficient combustion in the engine for CO₂ reduction, needs to be adopted on a wider range of cars. As a result, compact diesel vehicles will need to apply SCR technology.

Also, the increased need for NOx reduction leads to an increase in AdBlue®/DEF consumption on each vehicle. All elements in the feeding system from the tank to the injector must be designed to the new consumption rates. The presentation describes a current pump and filter and their evolution.

An additional effect of this consumption increase is the sizing of the AdBlue®/DEF tank onboard the vehicle. A regular refill of the AdBlue®/DEF by the vehicle driver becomes mandatory in the majority of European applications. The presentation will describe in detail the evolution of tank size and refill interface.

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Upcoming Emission Regulations for Passenger Cars : Impact on SCR System Requirements and Developments 2013-01-1072

SAE MOBILUS