A torque distribution strategy was designed by using fuzzy logic to realize the optimal control. The vehicle load zones were dynamically divided into several zones by several torque lines to indicate the drivers deman...A torque distribution strategy was designed by using fuzzy logic to realize the optimal control. The vehicle load zones were dynamically divided into several zones by several torque lines to indicate the drivers demand and the high or low efficient operating areas of the diesel engine. The fuzzy logic controller with trapezoid membership function and Mamdani rule reference mechanism was utilized. There are over 100 rules used in this fuzzy-based torque distribution strategy which are sorted into four rule-bases. The fuel economy and acceleration tests were designed to test and validate the integrated starter/generator (ISG) bus perfor-mance using fuzzy-based torque distribution strategy. The fuel economy is improved 7.7% compared with the rule-based strategy. Finally the road test results reveal that there is about 15% improvement of fuel economy. And the 0-50 km/h acceleration time is 9.5% shorter than the original bus.展开更多
为提高混合动力汽车(hybrid electric vehicle,HEV)起动发电一体化(integrated starter and generator,ISG)系统用电源的工作性能,提出了一种由超级电容器与蓄电池直接并联,并通过双向DC-DC功率变换器向ISG升压供电的低压复合电源方案,...为提高混合动力汽车(hybrid electric vehicle,HEV)起动发电一体化(integrated starter and generator,ISG)系统用电源的工作性能,提出了一种由超级电容器与蓄电池直接并联,并通过双向DC-DC功率变换器向ISG升压供电的低压复合电源方案,充分利用蓄电池比能量大和超级电容器比功率大的性能,蓄电池作为能量存储模块主要为车载低压用电设备提供电能,超级电容器作为功率缓冲单元瞬时释放功率和回馈能量,两种电源优势互补,使得ISG系统的起/停控制快、能量再生利用好、动力辅助性强等优越性能可较大程度地得以实现,并增加车载低压蓄电池的使用寿命。仿真结果验证了所提出复合电源的有效性。展开更多
A system model is established to analyze the dynamic performance of an integrated starter and generator （ISG） hybrid power shafting. The model couples the electromechanical coupling shaft dynamics, the bearing hydro...A system model is established to analyze the dynamic performance of an integrated starter and generator （ISG） hybrid power shafting. The model couples the electromechanical coupling shaft dynamics, the bearing hydrodynamic lubrication and the engine block stiffness. The model is com- pared with the model based on ADAMS or the model neglecting the bearing hydrodynamics. The bearing eccentricity and the oil film pressure have been calculated under different hybrid conditions or at the different motor power levels. It＇ s found that the bearing hydrodynamics decreases the cal- culation results of the bearing peak load. Changes of the hybrid conditions or the motor power have no significant effect on the main bearing, but have impact on the motor bearing. A hybrid power sys- tem composed of a 1.6 L engine and a 45 kW ISG motor can operate safely.展开更多
文摘A torque distribution strategy was designed by using fuzzy logic to realize the optimal control. The vehicle load zones were dynamically divided into several zones by several torque lines to indicate the drivers demand and the high or low efficient operating areas of the diesel engine. The fuzzy logic controller with trapezoid membership function and Mamdani rule reference mechanism was utilized. There are over 100 rules used in this fuzzy-based torque distribution strategy which are sorted into four rule-bases. The fuel economy and acceleration tests were designed to test and validate the integrated starter/generator (ISG) bus perfor-mance using fuzzy-based torque distribution strategy. The fuel economy is improved 7.7% compared with the rule-based strategy. Finally the road test results reveal that there is about 15% improvement of fuel economy. And the 0-50 km/h acceleration time is 9.5% shorter than the original bus.
文摘为提高混合动力汽车(hybrid electric vehicle,HEV)起动发电一体化(integrated starter and generator,ISG)系统用电源的工作性能,提出了一种由超级电容器与蓄电池直接并联,并通过双向DC-DC功率变换器向ISG升压供电的低压复合电源方案,充分利用蓄电池比能量大和超级电容器比功率大的性能,蓄电池作为能量存储模块主要为车载低压用电设备提供电能,超级电容器作为功率缓冲单元瞬时释放功率和回馈能量,两种电源优势互补,使得ISG系统的起/停控制快、能量再生利用好、动力辅助性强等优越性能可较大程度地得以实现,并增加车载低压蓄电池的使用寿命。仿真结果验证了所提出复合电源的有效性。
基金Supported by the National Natural Science Foundation of China( 51105032)
文摘A system model is established to analyze the dynamic performance of an integrated starter and generator （ISG） hybrid power shafting. The model couples the electromechanical coupling shaft dynamics, the bearing hydrodynamic lubrication and the engine block stiffness. The model is com- pared with the model based on ADAMS or the model neglecting the bearing hydrodynamics. The bearing eccentricity and the oil film pressure have been calculated under different hybrid conditions or at the different motor power levels. It＇ s found that the bearing hydrodynamics decreases the cal- culation results of the bearing peak load. Changes of the hybrid conditions or the motor power have no significant effect on the main bearing, but have impact on the motor bearing. A hybrid power sys- tem composed of a 1.6 L engine and a 45 kW ISG motor can operate safely.
