Simulation of city bus performance based on actual urban driving cycle in China

Abstract

This paper establishes the simulation model of a city bus on the basis of the EQ6110 bus prototype and its experimental data. According to the actual urban driving cycle, the fuel economy and the traction performance of the EQ6110 city bus have been simulated, and factors such as the driving cycle, the loss of power to engine accessories, the gear-shifting strategy, the fuel shut-off strategy of the engine, etc., which influence on the bus's fuel economy, are also quantitatively analyzed. Some conclusions are drawn as follows: (1) driving cycles have a great influence on the fuel economy of a city bus;(2) under the typical urban driving cycle of the public bus in China, the engine fuel shut-off strategy can save about 1 to 1.5 percent of the fuel consumption; and (3) the optimized gear-shifting rules can save 6.7 percent of the fuel consumption. Experimental results verify that the fuel economy for the EQ6110 public bus is improved by 7.2 pecent over the actual Wuhan urban driving cycle of the current public bus in China.

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“…The parameters of the vehicle model are provided in Table 1. Vehicle parameters are estimated from existing literature on transit bus simulation [19][20][21] and from manufacturer specifications for an electric transit bus [22].…”

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“…The target vehicle is a 15 t urban bus with a 199 kW diesel engine, and its key parameters are reported in Table 2 [14,15]. The driving resistance without considering the grade resistance and the accelerating resistance can be represented by the following equations [15]:…”

“…The driving resistance without considering the grade resistance and the accelerating resistance can be represented by the following equations [15]:…”

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