Abstract
Particle Measurement Programme has proposed a draft regulation on particle emission fromm light-duty diesel vehicle. A counting system has been developed to measure engine exhaust solid particle emission in real time according to this proposal. The system consists of a pre-classifier, a hot diluter, a thermal conditioning unit followed by a cold diluter. Two wide range continuous diluters have been used as hot diluter and cold diluter. An evaporation unit maintained at 300 to 400ºC temperature was used for thermal conditioning of exhaust gas. A condensation particle counter has been used for counting particles. The performance of the instrument has been evaluated. All of the recommended performances have been achieved and to some extend they are better than recommendation. The accuracy of overall dilution ratio is normally within ±5% in the designed range. The instrument has very low particle losses, and exhibits over 95% penetration for solid particles. The evaporation unit can remove more than 99% of volatile fractions. The system has very good linearity in measurement (R2 > 0.95). Finally the particle emissions from engine and vehicle have been tested. The instrument exhibits good repeatability and high sensitivity and can measure solid particle emission from engines and vehicles under steady state and transient test cycles.
Keywords:PMP, CPC, Solid Particle, VOF, Particle Number Diluter, Wide Range Continuous Diluter