Exhaust gas

Exhaust gas

These strict limits cannot be complied with just by improving combustion in the engine. For this reason, many manufacturers of commercial vehicles and passenger cars employ “selective catalytic reduction” (SCR). This form of exhaust aftertreatment reduces nitrogen oxide emissions by introducing an extremely pure solution of urea. Bosch has developed a pump for this purpose that injects a precisely measured quantity of the urea additive. Its powerful and reliable pump drive comes from ebm-papst.

Developing this system was extremely challenging: the quantity of additive, which the pump injects directly into the exhaust stream, has to be adjusted to precisely match the volume of nitrogen oxide in the exhaust gas. The pump also needs to have a wide volumetric flow range and must operate reliably throughout the entire service life of the vehicle.