城市公交车发动机循环工况的试验研究与建立

Study and Establishment of Engine Duty Cycle for City Buses

通过公交车市区道路试验,在获取大量反映公交车市区行驶特性数据的基础上,利用多元统计理论确定了城市公交车行驶工况的解析方法,建立了能够反映城市公交车实际行驶特征的城市公交车行驶循环工况,并对建立的公交车行驶循环工况的有效性进行了试验和理论验证。通过建立试验公交车的整车性能仿真模型,将公交车运行驶工况转化为发动机循环工况。研究表明:GB/T12545.2-2001中规定的用于评价公交车燃油经济性的四工况与循环建立的公交车行驶工况具有较大差别。

Feasibility of evaluating the fuel economy of city buses by the engine steady duty cycle was studied. Lots of data that can represent the driving condition of the city bus was acquired by field test. Based on these test data, the multi-statistic method was used to resolve the driving cycle of the city bus that can represent the real driving condition of the city bus and the validity of the driving cycle was assured by testing and theory analysi＇s. Then the simulation model of the city bus was developed and based on the model the driving cycle was transferred to the duty cycle of the engine. The results indicate that there is a great difference between the 4-model driving cycle according to the GB/T1254.52--2001 and the developed driving cycle.