Distributive Regularity of Passenger Car Carbon Monoxide Emission in Idle Condition

In order to accurately describe the distributive regularity of in-use passenger car carbon monoxide (CO) in idle condition, based on the actual detecting data of 1,069 passenger cars, and by way of strict parameter estimating and hypothesis testing, it is affirmed that the idle CO emission of two types researched passenger cars all obeys two parameter Weibull distribution, and the corresponding distributive density function and the distributive function models are established. The qualified rates of two type passenger cars' idle CO emission detecting are all 77% or so, and the relative errors between the results got by model calculation and by sample actual detection are 2.82% and 4.89% respectively. The research shows clearly that the CO emission distributive regularity is accurate, and model calculation results are reliable also. In addition, the qualified rate of idle CO emission still has a long way to go to catch up with the actual qualified rate of three type passenger cars' idle HC emission, which are all higher than 98%, so it is suggested that the main direction of reducing vehicle emission in big and middle cities should be concentrated on cutting down CO emission of passenger cars.