Maximum grade and length of longitudinal slope adapted to dynamic performance of six-axis articulated vehicle
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摘要: 针对当今中国高速公路货运主导车型6轴铰接列车以满载状态在相同纵坡条件下行驶时, 其性能差于《公路工程技术标准》 (JTG B01—2014) 中纵坡设计代表车型的问题, 采用典型平路试验和实际道路试验相结合的方法, 获得了该主导车型的发动机使用外特性曲线, 分析了试验车发动机转矩、功率与发动机转速的关系; 依据汽车行驶受力方程, 建立了该主导车型在各个挡位下的坡度与车速的关系曲线, 确定了不同纵坡坡度时, 发动机全负荷状态下车辆稳定行驶的最大平衡速度, 获得了该主导车型的加速性能曲线和减速性能曲线, 提出了符合中国当前货运车型变化的高速公路上坡方向纵坡坡度、坡长等主要控制指标。研究结果表明: 相比于《公路工程技术标准》 (JTG B01—2014), 在相同纵坡条件下, 由于主导车型比功率的降低, 其平衡速度较标准中纵坡设计代表车型对应的平衡速度降低了20%~30%, 且适应其动力性的最大纵坡坡度比标准中规定的纵坡坡度小50%, 因此, 中国当前主导货运车辆动力性能不适应高速公路纵坡条件; 根据6轴铰接列车在不同纵坡上的加减速特性, 满足6轴铰接列车爬坡需求的最大纵坡坡长随坡度的增大而降低, 且降低幅度逐渐增大, 最大降幅达到60%。
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关键词:
- 道路工程 /
- 纵坡设计指标 /
- 6轴铰接列车 /
- 发动机使用外特性曲线 /
- 平衡速度
Abstract: For the problem that under the same longitudinal grade, the dynamic performance of a representative (six-axis articulated) vehicle in highway freight transportation in China with full load was worse than the representative vehicle for the longitudinal slope design in Technical Standard of Highway Engineering (JTG B01—2014), the actual engine performance curves ofthis representative type of vehicle were obtained by combining the typical flat road test and the actual road test. The relationship between engine torque and engine rotate speed, as well as the relationship between engine power and engine rotate speed were analyzed. The relationship curves of slope grade-vehicle speed were established under different gears according to the motor vehicle motion equation. The maximum equilibrium vehicle speed under the condition of steady running, full engine load and different longitudinal grades were determined. The curves of acceleration and deceleration performance of this representative type of vehicle were gained to propose the primary longitudinal slope design indicators such as the grade and length of the longitudinal slope, which conform to the change of freight vehicle type in China. Research result shows that under the same longitudinal grade, owing to the reduction in the specific power of the representative vehicle, its equilibrium speed decreases by 20%-30% compared to the representative vehicle for the longitudinal slope design in Technical Standard of Highway Engineering (JTG B01—2014). The maximum longitudinal grade adapted to the six-axis articulated vehicle is 50% lower than that specified in the standard. Therefore, the dynamic performance of the current representative vehicle cannot adapt to highway longitudinal slope design indicators. According to the acceleration and deceleration characteristics of the six-axis articulated vehicle under different longitudinal grades, the maximum slope length satisfied the climbing demand of six-axis articulated vehicle decreases with the increase of longitudinal grade, the reduction increases gradually, and the largest reduction reaches 60%. -
图 1 2009~2016年中国货车数占比
Figure 1. Quantity proportions of trucks in China from 2009to 2016
图 7 不同挡位驱动力与车速关系曲线
Figure 7. Relationship curves of driving force and speed under different gears
图 8 不同挡位爬坡度与车速关系曲线
Figure 8. Relationship curves of climbing grade and speed under different gears
图 9 不同纵坡坡度下试验车平衡速度
Figure 9. Equilibrium speeds of test truck under different longitudinal grades
图 10 不同坡度下试验车加速曲线
Figure 10. Acceleration curves of test truck under different longitudinal grades
图 11 不同坡度下试验车减速曲线
Figure 11. Deceleration curves of test truck under different longitudinal grades
表 2 不同纵坡坡度下试验车的平衡速度
Table 2. Equilibrium speeds of test truck under different longitudinal grades
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表 3 试验车不同挡位旋转质量换算系数
Table 3. Coefficients of rotating mass conversion of test truck under different gears
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表 4 适应试验车动力性能的最大纵坡坡度
Table 4. Maximum longitudinal grades adapted to dynamic performance of test truck
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表 5 不同设计速度与坡度对应的最大坡长
Table 5. Maximal slope lengths correspond to different design speeds and longitudinal grades
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