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C.模拟计算采用E—P模拟程序进行模拟计算,以总传动比为输入变量(在变速器速比确定之后只改变驱动桥速比),以燃料经济性指标和动力性指标值作为输出结果。燃料经济性的评价指标选取变工况的循环油耗,而不是等速油耗,因为后者不能反映出变速器各档位及非稳态对油耗的影响。动力性评价指标选取0→70km/h的加速时间(或距离),或者0→1000m、(或500m)的加速时间(或末速度)。采用“最佳动力性燃料经济性曲线”方法时两种变速器的比较见图3。通过比较
C. Simulation Calculation The E-P simulation program is used to simulate the calculation. The total transmission ratio is taken as the input variable (only the ratio of the transaxle is changed after the transmission ratio is determined), and the fuel economy index and the dynamic index value are taken as the output results. The evaluation index of fuel economy chooses the cyclic fuel consumption of variable working condition instead of constant fuel consumption because the latter can not reflect the influence of transmission gear and unsteady state on fuel consumption. The dynamic evaluation index selects the acceleration time (or distance) of 0 → 70km / h, or the acceleration time (or the final speed) of 0 → 1000m, (or 500m). The comparison of two transmissions with the “best dynamic fuel economy curve” approach is shown in Figure 3. By comparison