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基于某型汽车起重机等速行驶试验,提出一种新的汽车起重机滚动阻力系数及风阻系数的理论计算模型。通过试验测得各等速行驶车速下的发动机转速、转矩信息,计算出整车行驶阻力,运用最小二乘法对构建出的行驶阻力方程进行二次多项式曲线拟合,进而得到整车行驶阻力系数。利用Cruise软件建立该型汽车起重机下车行驶模型,将计算得到的滚阻、风阻系数作为模拟行驶阻力输入模型中,通过仿真得到的油耗数据与试验值进行对比,验证了计算模型的正确性。文中构建的理论计算模型,同样可适用于货车、客车等大型车辆的行驶阻力计算。
Based on the constant speed traveling test of a certain type of truck crane, a new theoretical model of rolling resistance coefficient and drag coefficient of truck crane is proposed. Through testing the engine speed and torque information at each constant speed, the driving resistance of the whole vehicle is calculated, the quadratic polynomial curve fitting is applied to the running resistance equation by using the least square method, and then the driving resistance of the vehicle is obtained coefficient. Cruise software is used to establish the model of getting off the vehicle crane. The calculated rolling resistance and drag coefficient are used as simulation driving resistance input model. The fuel consumption data obtained by the simulation are compared with the experimental values to verify the correctness of the calculation model. The theoretical calculation model built in this paper can also be applied to the calculation of running resistance of large vehicles such as trucks and buses.