Eco-driving strategy at ramp road for hybrid electric vehicles based on two-state dynamic programming

doi:10.3969/j.issn.1674-8484.2021.03.012

Abstract

Abstract:

The effect of driving time of on-road vehicles on eco-driving (ECO) strategy at ramp road was investigated for hybrid electric vehicles (HEV) by using adjusting vehicle speeds to reduce the energy consumed by vehicles. An ECO strategy model was established based on two-state dynamic programming with driving distance and vehicle speed selected as two states, and driving time as a stage variable; The sum of driving and braking energy was used as objection function due to the fuel economy of on-road HEV mainly affected by vehicle energy demand. After calculation from the vehicle model of a HEV operating at different driving strategies, the results show that the fuel economy of the HEV at ECO strategy reduces by 17.6 % for up-down road and 12.2 % for down-up road respectively compared to fixed-speed driving strategy; The influence of driving time on the fuel economy of the HEV at ECO strategy is more obvious at up-down road than at down-up road.

Key words: eco-driving (ECO), hybrid electric vehicle (HEV), ramp road, driving time, driving strategy, two-state dynamic programming

CLC Number:

U461.8

FU Xueqing, WANG Baosen, YANG Jianjun, GAO Haiyang, HE Bangquan, ZHAO Hua, GUO Wencui, LIU Shuangxi. Eco-driving strategy at ramp road for hybrid electric vehicles based on two-state dynamic programming[J]. Journal of Automotive Safety and Energy, 2021, 12(3): 373-379.

Figures/Tables 9

References 15

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坡道	驾驶策略	t_d / s	ΔSOC / %	100 km油耗 / L	100 km折合油耗 / L
上下	FSD	60	0.2	6.46	6.47
	ECO	48	1.5	7.38	7.42
	ECO	60	1.8	5.28	5.33
	ECO	72	5.1	3.39	3.54
下上	FSD	60	0.2	6.45	6.46
	ECO	48	1.1	7.11	7.14
	ECO	60	2.3	5.60	5.67
	ECO	72	3.1	4.80	4.89

坡道	驾驶策略	t_d / s	ΔSOC / %	100 km油耗 / L	100 km折合油耗 / L
上下	FSD	60	0.2	6.46	6.47
	ECO	48	1.5	7.38	7.42
	ECO	60	1.8	5.28	5.33
	ECO	72	5.1	3.39	3.54
下上	FSD	60	0.2	6.45	6.46
	ECO	48	1.1	7.11	7.14
	ECO	60	2.3	5.60	5.67
	ECO	72	3.1	4.80	4.89