摘要
以双电机独立电驱动增程式电动拖拉机旋耕机组为对象,提出一种适用于旋耕作业的双输入变量后向建模方法,即在模型中将行驶速度和动力输出轴旋耕转矩作为输入量,设计了双电机独立驱动增程式电动拖拉机动力系统能量管理模型。针对旋耕作业特性,提出一种基于实测数据与经验公式相结合的设计方法,建立了旋耕工况周期模型。基于动态规划算法,分别对其进行旋耕作业仿真试验和台架试验,结果表明:仿真试验结果与台架试验结果吻合度较高,能量管理模型能够很好地描述增程式电动拖拉机在给定旋耕工况下各电机功率、发电机组功率和动力电池组荷电状态的变化情况,且仿真试验和台架试验中燃油消耗量分别为4065.5 g和3994.7 g,其相对误差为1.77%,验证了建立的增程式电动拖拉机旋耕机组能量管理模型的合理性和准确性。
The demand for green power agricultural machinery and equipment in modern agricultural production environment is more and more urgent.Among them,the extended⁃range electric tractor has attracted much attention in the demand for medium and high horsepower,which not only makes up for the lack of battery life of pure electric tractors,but also reduces pollution emissions compared with traditional tractors.Due to the complex operating conditions of tractors(such as ploughing,rotary tillage,transportation,and harvesting,etc.),among them,rotary tillage is one of the most common agricultural operations.In order to promote the diversified development of electric tractor products,taking an extended⁃range electric rotary⁃tilling tractor with a dual⁃motor independent electric drive structure as the object,a novel backward modeling method of a dual⁃input variable,including the forward speed and the power take⁃off(PTO)was proposed to set up the energy management model of the powertrain system.The energy management model designed mainly contained a Genset model,motor model,power battery pack model,transmission system(reducer and differential)model,wheel⁃soil system model,engine accessories,and auxiliary load system models.According to the characteristics of rotary tillage operation,a design method based on the combination of measured data and empirical formulas was put forward to establish a cycle model of rotary tillage conditions,which provided an environment for simulation tests and bench tests.Based on the dynamic programming,the energy management strategy of the extended⁃range electric rotary⁃tilling tractor was designed,the rotary tillage operation simulation test and the bench test were carried out respectively.The results showed that the simulation results were in good agreement with the bench test results in the aspect of the forward speed,and the maximin average error was 2.18%,which was within the acceptable range,especially when operating at low speed below 0.6 m/s,these two results were basically
作者
汪珍珍
周俊
王旭
WANG Zhenzhen;ZHOU Jun;WANG Xu(College of Optical,Mechanical and Electrical Engineering,Zhejiang A&F University,Hangzhou 311300,China;College of Engineering,Nanjing Agricultural University,Nanjing 210031,China)
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2023年第4期428-438,共11页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家重点研发计划项目(2016YFD0701003)
浙江农林大学科研发展基金项目(2022LFR071)
江苏省现代农机装备与技术示范与推广项目(NJ202136)。
关键词
增程式电动拖拉机
旋耕
动态规划
能量管理模型
双电机独立驱动
extended⁃range electric tractor
rotary tillage
dynamic programming
energy management model
dual⁃motor independent drive
