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Coordinated control of hybrid electric vehicle based on extended state observer estimation |
Jia-jia WANG( ),Ying-feng CAI*( ),Long CHEN,Shao-hua WANG,De-hua SHI |
Automotive Engineering Research Institute, Jiangsu University, Zhenjiang 212013, China |
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Abstract A torque coordinated control strategy based on disturbances compensation was proposed in order to improve the mode switching stability of power-split hybrid electric vehicles. A multi-variable linear extended state observer was designed aiming at the problem of engine dynamic response oscillation and vehicle driving condition variation. Then its estimation accuracy of the above disturbances was verified from the frequency domain perspective. The influence law of different disturbances on the stability of basic motor compensation control was analyzed. The load disturbance has a greater influence on the vehicle mode switching response, and the peak value of the switching jerk can reach 24.5 m/s3. The coordinated control strategy of power sources torque redistribution algorithm based on disturbances compensation was proposed and verified by simulation. Results show that the control strategy can guarantee the system stability and smoothness of mode switching under the obvious interference.
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Received: 08 June 2020
Published: 05 July 2021
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Fund: 国家自然科学基金资助项目(U1764257,51905219);江苏省重点研发计划资助项目(BE2016149);江苏省自然科学基金青年基金资助项目(BK20190844);江苏省高等学校自然科学研究资助项目(19KJB580001) |
Corresponding Authors:
Ying-feng CAI
E-mail: wjj751772554@163.com;caicaixiao0304@126.com
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基于扩张状态观测器估计的混合动力汽车协调控制
为了提高功率分流式混合动力汽车模式切换的稳定性,提出干扰补偿的转矩协调控制策略. 针对发动机动态响应振荡及车辆行驶工况多变的问题,设计多变量线性扩张状态观测器,从频域角度验证了观测器对于上述2种干扰的估计精确性. 研究不同干扰对基础电机补偿控制稳定性的影响,指出负载干扰对车辆模式切换响应的影响最大,引起的切换冲击最大可至24.5 m/s3. 提出基于干扰补偿的动力源转矩再分配算法,开展仿真验证. 结果表明,该协调控制策略在受到明显的外界干扰时能够保证系统的稳定性及模式切换的平顺性.
关键词:
混合动力汽车(HEV),
模式切换,
扩张状态观测器,
外界干扰,
稳定性
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