Controlling motorcycle emissions performance over a drive cycle is a multifaceted challenge for the aftertreatment design team.
On one hand the motorcycle emissions must fall below legislative target values, but on the other hand the aftertreatment cost must be controlled. This is particularly prudent with current trends in precious metal group costs.
One other factor to consider in this equation is the oxygen storage capacity (OSC) of the catalyst, which may aid the development of a cost effective aftertreatment solution.
The effectiveness of O2 storage in emissions control is dependent on the OSC availability. There are multiple factors to consider including:
– washcoat technology,
– catalyst volume,
– catalyst temperature and
– the level of ageing of the cat amongst others.
The combined impact of each of these factors together determines the available OSC at a point in time, whether that is in the catalyst’s lifetime, or within a drive cycle.
Overall, the impact of OSC on emissions performance is clear from this short study; we can use the OSC mechanism to mitigate against the negative impact of lean or rich excursions during transient phases of the drive cycle.
The amount by which we can control transient emissions is governed by the quantity of available OSC, with more OSC giving us more leeway, and consequently yielding improved emissions performance over the drive cycle.
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