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温室气体包括CO2、N2O及CH4。由于N2O和CH4的排放特性受催化剂温度的影响较为显著,因此,着眼于道路坡度及冷机时间(从发动机停机到再次起动的时间)对催化剂温度的影响进行研究,以寻找评价汽油车温室气体排放的试验方法。由试验结果发现,在短时间冷机之后发动机重新起动时,道路坡度的影响较小,且N2O排放呈增加趋势。并且,由于汽油车在实际使用中经常会出现短时间停车的情况,因此认为,在评价汽油车温室气体排放的过程中,短时间冷机条件下的试验是必不可少的。
Greenhouse gases include CO2, N2O and CH4. Since the emission characteristics of N2O and CH4 are particularly affected by the temperature of the catalyst, the influence of the slope temperature and the cooling time (from the time when the engine stops to the start again) on the catalyst temperature is studied to find a way to evaluate the greenhouse gas Emission test method. It is found from the test results that when the engine is restarted after a short period of cold, the effect of road gradient is smaller and the N2O emission tends to increase. Moreover, since petrol cars often have short-term parking during actual use, it is considered that the tests under short-term chiller conditions are indispensable in evaluating the greenhouse gas emissions from petrol vehicles.