Enhancing the Performance of a Catalyst Formulation for a Big Displacement Motorcycle for Future Emission Regulations, Part 2

摘要

In Europe the next level of emission regulations for motorcycles, Euro IV, is on the verge of introduction, followed by Euro V around 2021. Together with the new emission regulations, the ECE R 40 testing cycle will become obsolete and the more realistic World Motorcycle Testing Cycle (WMTC) will be introduced. Current catalytic solutions for gasoline engines consist of so-called three way catalysts (TWC) that are able to reduce the emissions of CO, NO_x and hydrocarbons (HC) below the regulatory emission limit. These catalysts mostly contain platinum (Pt), palladium (Pd) and rhodium (Rh) in different concentrations and ratios. Another important component is the so-called oxygen storage material (OSC) which compensates for the fluctuations in lambda during acceleration and deceleration. Currently existing catalyst formulations must be modified to fulfil the more stringent emission limits with simultaneous consideration of a more realistic test cycle. Last year we presented modifications of an existing Euro III catalyst formulation for a 690cc motorcycle from model year (MY) 2012. According to our customer, the result was a formulation that fulfilled the Euro IV emission regulation. We would like to present results of our further modified Euro IV solution. For our tests, we used a 690cc motorcycle from MY2014; this motorcycle was as a reference source of emissions to be able to compare the performance of different catalyst formulations. With our results, we want to show that Euro V for motorcycles is technically possible.