Light-Duty Vehicles Driving Cycle Construction Based on Urban Roads

In order to regulate vehicle energy consumption, calibrate vehicle emission and optimize vehicle performance, the driving cycles of light-duty vehicles on the urban roads of Hohhot is analyzed. Firstly, the 74 sample data of driving cycles were collected through special data acquisition equipments of CATC (China automotive test cycle). These samples cover tall types of roads, light-duty vehicles and drivers. Secondly, weights were assigned to different vehicles to set vehicle type proportion. The sample data are processed by principal component analysis and clustering analysis and the short segment rules are formulated. Finally the kinematic segments are clipped and their characteristics values are classified. Thus, the operating conditions of light-duty vehicles on urban roads are constructed. The results show that the average speed of CATC is 25.87 km/h, average running speed is 33.92 km/h, uniform speed ratio is 20.59%, idling ratio is 23.72%, acceleration ratio is 28.56% and deceleration ratio is 27.13%. Compared to the European Union (EU) cycle test condition, the average speed, average running speed and uniform speed ratio are lower than those of the EU standard, while the acceleration ratio, deceleration ratio and idling ratio are higher.