CatVap® – New Heating Measure for Exhaust Aftertreatment Systems to Fulfill the Strictest Future Emission Limits

Today's challenge is to comply 100% with emission limits in Real Drive Emission (RDE) behavior, especially in the cold season, the so-called "cold city rides" that are characterized by the fact that during stop and go rides in the city, at no time a sufficient temperature for an efficient exhaust aftertreatment is reached [1]. The future Euro 6+ or certainly the expected new Euro 7 limit values will therefore only be achieved with suitable effective thermal heating, heat retention as well as DPF regeneration measures for the exhaust aftertreatment (EAT) system.The CatVap system is an important key enabler for near zero-emission internal combustion (IC) engines that need to be realized in the near future. Our paper from last year showed the basic function of the CatVap system as well as the new heat-up and temperature control system for exhaust aftertreatment systems [2]. We are now presenting the first engine tests, focusing on the CatVap system for commercial vehicle applications which has now been significantly enhanced. Our newly developed system has shown great potential in dynamic component tests and advanced engine testing, i.e. on a modern medium-duty commercial vehicle engine test bench; it also produced impressive results in comparison with other technologies such as an HC dosing system. CatVap is showing decisive advantages in such direct comparisons, e.g. in terms of heating speed, dynamics, even temperature distribution and efficiency at significantly lower light-off temperatures (e.g. for the DOC). This enables a significantly earlier start of urea dosing for the SCR system. Last but not least, our new technology shows significantly lower additional fuel consumption, especially compared to HC dosing technology. These impressive new results will be presented and discussed in detail in this article.