Aiming at the development of parallel hybrid electric vehicle (PHEV) powertrain, parameter matching and optimization are presented, According to the performance of PHEV, the optimization range of engine, motor, driv...Aiming at the development of parallel hybrid electric vehicle (PHEV) powertrain, parameter matching and optimization are presented, According to the performance of PHEV, the optimization range of engine, motor, driveline gear ratio and battery parameters are determined. And then a two-level optimization problem is formulated based on analytical target cascading (ATC). At the system level, the optimization of the whole vehicle fuel economy is carried out, while the tractive performance is defined as the constraints. The optimized parameters are cascaded to the subsystem as the optimization targets. At the subsystem level, the final drive and transmission design are optimized to make the ratios as close to the targets as possible. The optimization result shows that the fuel economy had improved significantly, while the tractive performance maintains the former level.展开更多
"协作问题解决"(Collaborative problem solving,简称CPS)能力是21世纪人才所应必备的能力,ATC21S项目组分别从社会技能和认知技能两个维度去理解"协作问题解决(CPS)"能力的内涵、测试框架和指标等,并且该项目组开..."协作问题解决"(Collaborative problem solving,简称CPS)能力是21世纪人才所应必备的能力,ATC21S项目组分别从社会技能和认知技能两个维度去理解"协作问题解决(CPS)"能力的内涵、测试框架和指标等,并且该项目组开发出了两套测试任务来对学生的"协作问题解决能力"进行测量。对"协作问题解决(CPS)"能力测试框架、指标和测试任务的正确理解,有助于当下学生"核心素养"的培养。展开更多
摘要Aiming at the development of parallel hybrid electric vehicle (PHEV) powertrain, parameter matching and optimization are presented, According to the performance of PHEV, the optimization range of engine, motor, driveline gear ratio and battery parameters are determined. And then a two-level optimization problem is formulated based on analytical target cascading (ATC). At the system level, the optimization of the whole vehicle fuel economy is carried out, while the tractive performance is defined as the constraints. The optimized parameters are cascaded to the subsystem as the optimization targets. At the subsystem level, the final drive and transmission design are optimized to make the ratios as close to the targets as possible. The optimization result shows that the fuel economy had improved significantly, while the tractive performance maintains the former level.
摘要"协作问题解决"(Collaborative problem solving,简称CPS)能力是21世纪人才所应必备的能力,ATC21S项目组分别从社会技能和认知技能两个维度去理解"协作问题解决(CPS)"能力的内涵、测试框架和指标等,并且该项目组开发出了两套测试任务来对学生的"协作问题解决能力"进行测量。对"协作问题解决(CPS)"能力测试框架、指标和测试任务的正确理解,有助于当下学生"核心素养"的培养。