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Analysis of PnG strategy focusing on the effect of the duration of pulse mode

机译：专注于脉冲模式持续时间的PNG战略分析

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When using Pulse and Glide (PnG) strategy, the vehicle accelerates and decelerates repeatedly. With the considered vehicle, during pulse mode the engine outputs positive power to drive the vehicle; during glide mode the engine idles and is decoupled from the drivetrain. PnG strategy was found to be more fuel-economic than constant speed (CS) strategy in a car-following scenario. In our past research, it was found that the most fuel-economic operating point of the engine during pulse mode is not the minimum BSFC point, but an operating point outputting a lower power. In this study, the effects of the duration of pulse mode on the following three factors are investigated: fuel economy, frequency of the speed pattern, fluctuation amplitude of vehicle speed. Optimization problems are solved to find the most fuel-economic manner of PnG strategies for specified values of the duration of pulse mode in a free-driving scenario. The calculation results for two types of engines with different fuel consumption characteristics are compared to validate the conclusion. It is found that the frequency of the speed pattern decreases monotonically as the duration of pulse mode increases. However, PnG strategy remains to be more fuel-economic than CS strategy when the frequency of the speed pattern of PnG strategy changes within a wide range. This conclusion holds for both engine characteristics. Therefore, it is considered that PnG strategy is worth to be implemented for fuel economy. The results can be used to trade off the fuel economy and the ride comfort by setting the value of the duration of pulse mode appropriately considering the frequency of the speed pattern and the fluctuation amplitude of the vehicle speed.
机译：当使用脉冲和滑行（PNG）策略时，车辆重复加速和减速。利用所考虑的车辆，在脉冲模式期间，发动机输出正电量以驱动车辆;在滑动模式期间，发动机怠速并从动力传动系统解耦。发现PNG战略比在汽车跟踪场景中的恒定速度（CS）策略更加燃料 - 经济。在我们过去的研究中，发现脉冲模式期间发动机最具燃料经济工作点不是最小BSFC点，而是输出较低功率的操作点。在本研究中，研究了脉冲模式持续时间对以下三个因素的影响：燃料经济性，速度频率，车速波动幅度。解决了优化问题，以找到自由驾驶场景中脉冲模式持续时间值的指定值的最燃料经济方式。比较了两种具有不同燃料消耗特性的发动机的计算结果以验证结论。发现速度模式的频率随着脉冲模式的持续时间而单调地减小。然而，当PNG战略速度变化在广泛范围内的速度模式的频率变化时，PNG战略仍然比CS策略更加燃料经济。这一结论适用于发动机特征。因此，认为PNG战略值得为燃料经济实施。结果可用于通过在考虑速度模式的频率和车速波动幅度的频率和车速的波动幅度的频率设定脉冲模式的持续时间的值来衡量燃料经济性和乘坐舒适度。

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