The Study of HEV Special Two-Stage TWC Characteristics
As there are many shortcomings for the traditional three-way catalyst (TWC),too large thermal inertia ,low heat capacity and poor thermal insulation properties .A new hybrid vehicles special two-stage TWC is designed.The experiment was carried out at drum test bench and frequent start/stop cycle condition.The result shows that the first-stage catalyst core temperature was maintained at 450°Cafter engine stop 200s, the peak value of HC emissions is only exist at the beginning 30 sec and the conversion efficiency of NOx up to 90% .The hybrid vehicles special two-stage TWC fully meet the frequent start / stop and transient cycle conditions requirment.
L. Y. Chen et al., "The Study of HEV Special Two-Stage TWC Characteristics", Advanced Materials Research, Vols. 588-589, pp. 295-298, 2012