基于智能控制的重卡48 V微混系统能效分析

孙云祥，王斌^*，李颖，张忠珍，闫富煦

中国重型汽车集团有限公司，山东 济南  250000

摘要：为提高车辆能量利用率，满足重卡用户用电的多样化需求，基于某牵引车搭建48 V微混系统，分析48 V微混系统电机辅助驱动策略及制动能量回收控制策略，采用中国半挂牵引车列车行驶工况（China heavy-duty commercial vehicle test cycle for tractor-trailer，CHTC-TT）进行转毂测试，分析车辆在纯柴油、微混两种状态下的工作特性。结果表明：车辆在微混状态进行CHTC-TT测试时，电机在辅助驱动模式下驱动效率为89.0%，百公里助力电能为2.477 kW·h；制动能量回收模式下发电效率为79.5%，百公里回收电能为2.924 kW·h；相同循环工况下，与纯柴油状态相比，微混状态下发动机平均转速降低117 r/min，整车平均负载增加0.25%，百公里燃油消耗降低4.17%。48 V微混系统能有效回收电能以辅助发动机驱动及整车用电，改善发动机运行工况。

关键词：48 V微混；制动能量回收；辅助驱动；重卡

Energy efficiency analysis of 48 V micro-hybrid system for a heavy-duty truck based on intelligent control

SUN Yunxiang, WANG Bin^*, LI Ying, ZHANG Zhongzhen, YAN Fuxu

China Heavy Duty Truck Group Co., Ltd., Jinan 250000,China

Abstract: To improve the vehicle energy utilization rate and meet the diversified electricity needs of heavy-duty truck user, a 48 V mild hybrid system is built based on a tractor. The control strategy of the motor assistance and the braking energy recovery control strategy of the 48 V mild system are analyzed. The China heavy-duty commercial vehicle test cycle for tractor-trailer (CHTC-TT) is used for the dynamometer test, and the working characteristics of the vehicle under the state of pure diesel and mild hybrid are analyzed. The results show that when the vehicle is tested with CHTC-TT in mild hybrid state, the driving efficiency of the motor in assistance mode is 89.0%, and the energy consumption of the motor assistance per hundred kilometers is 2.477 kW·h. The power generation efficiency in the braking energy recovery mode is 79.5%, and the energy recovery per hundred kilometers is 2.924 kW·h. Under the same condition, compared with the pure diesel state, the average engine speed decreased by 117 r/min, the average load of the whole increased by 0.25%, and the fuel consumption rate per hundred kilometers decreased by 4.17% in the mild hybrid state. The 48 V hybrid system can effectively recycle electric energy to assist the engine drive and the electricity consumption of the whole vehicle, and improve the engine operation condition.

Keywords: 48 V micro-hybrid; braking energy recovery; auxiliary drive; heavy-duty truck