Electrical power assisted steering (EPAS) is one of the key components, especially for electrical vehicle. It has attracted much attention for their advantages with respect to improved fuel economy and has been widely...Electrical power assisted steering (EPAS) is one of the key components, especially for electrical vehicle. It has attracted much attention for their advantages with respect to improved fuel economy and has been widely adopted as automotive power-steering equipment in recent years. EPS (electrical power steering) controllers contain MCU (microprocessor control unit) to implement the complex control algorithms. EPS control strategy development is the core technology of the whole system. To achieve the better performance of driving, both mechanical structures and electrical structures are totally designed as a whole. Model-based development is recommended to software design. There are several trends about EPS’ future, such as high power EPS development, high voltage EPS development and steering-by-wire technology.展开更多
A pinion-type electric power steering (EPS) equipped on a sedan is reached in this paper. A three-freedom dynamic model of this system is created. The variables affecting assist character is analyzed. The formulas of ...A pinion-type electric power steering (EPS) equipped on a sedan is reached in this paper. A three-freedom dynamic model of this system is created. The variables affecting assist character is analyzed. The formulas of simpled steering resistance force and the relationship between assist gain and vehicle speed are presented for the first time. Assist character is found based on the parameters of a sedan at last. This assist character is fit for the control rule of the EPS system through analyzing this character. The assist character figure offers reference for system design and control. Furthermore, this research method has generality for assist character of different kinds of vehicles.展开更多
In this paper,we propose an improved torque sensorless speed control method for electric assisted bicycle,this method considers the coordinate conversion.A low-pass filter is designed in disturbance observer to estima...In this paper,we propose an improved torque sensorless speed control method for electric assisted bicycle,this method considers the coordinate conversion.A low-pass filter is designed in disturbance observer to estimate and compensate the variable disturbance during cycling.A DC motor provides assisted power driving,the assistance method is based on the realtime wheel angular velocity and coordinate system transformation.The effect of observer is proved,and the proposed method guarantees stability under disturbances.It is also compared to the existing methods and their performances are illustrated through simulations.The proposed method improves the performance both in rapidity and stability.展开更多
In combination with the augmented reality (AR) technology and Hololens device, an electric power work assist system is developed to provide a more realistic and convenient training experience for electric power traini...In combination with the augmented reality (AR) technology and Hololens device, an electric power work assist system is developed to provide a more realistic and convenient training experience for electric power training. The training effect was improved, and help guidance information was provided in the actual operation of electric power work. Experimental results show that difficulty of electric power work is reduced and the efficiency of actual work is improved.展开更多
目的:观察助力电刺激训练对脑性瘫痪(脑瘫)患儿核心稳定的疗效。方法:从2011年11月—2012年9月在上海交通大学医学院附属新华医院康复医学科就诊的脑瘫患儿中选择19例痉挛型脑瘫患儿,按就诊顺序分为2组,观察组10例接受包括助力电刺激在...目的:观察助力电刺激训练对脑性瘫痪(脑瘫)患儿核心稳定的疗效。方法:从2011年11月—2012年9月在上海交通大学医学院附属新华医院康复医学科就诊的脑瘫患儿中选择19例痉挛型脑瘫患儿,按就诊顺序分为2组,观察组10例接受包括助力电刺激在内的康复治疗,对照组9例接受常规康复治疗。患儿入组后分别于治疗前、治疗3个月后采用粗大运动功能量表(gross motor function measure,GMFM88)和表面肌电图仪对患儿进行评估,分析脑瘫患儿治疗前后粗大运动功能量表中B区(坐位)、D区(站立位)、E区(行走、跑和跳)及腹直肌、竖脊肌表面肌电信号均方根值(RMS)的变化。结果:观察组、对照组患儿粗大运动功能(GMFM88、B、D、E区)及腹直肌RMS值、竖脊肌RMS值治疗前差异无显著性意义(P>0.05)。康复治疗3个月后,观察组GMFM88、B、D、E区粗大运动评分、腹直肌RMS值、竖脊肌RMS值显著高于治疗前(P<0.01),对照组GMFM88、B、D、E区粗大运动评分、腹直肌RMS值、竖脊肌RMS值高于治疗前(P<0.05)。观察组治疗后GMFM88、B、D、E区粗大运动评分、腹直肌RMS值、竖脊肌RMS高于对照组,差异有显著性意义(P<0.05)。结论:助力电刺激训练有助于改善脑瘫患儿的核心稳定性。展开更多
基金The Innovation and Technology Fund of Hong Kong Government ( No. ITP/042 /08AP &No. ITP/003 /10AP)
文摘Electrical power assisted steering (EPAS) is one of the key components, especially for electrical vehicle. It has attracted much attention for their advantages with respect to improved fuel economy and has been widely adopted as automotive power-steering equipment in recent years. EPS (electrical power steering) controllers contain MCU (microprocessor control unit) to implement the complex control algorithms. EPS control strategy development is the core technology of the whole system. To achieve the better performance of driving, both mechanical structures and electrical structures are totally designed as a whole. Model-based development is recommended to software design. There are several trends about EPS’ future, such as high power EPS development, high voltage EPS development and steering-by-wire technology.
文摘A pinion-type electric power steering (EPS) equipped on a sedan is reached in this paper. A three-freedom dynamic model of this system is created. The variables affecting assist character is analyzed. The formulas of simpled steering resistance force and the relationship between assist gain and vehicle speed are presented for the first time. Assist character is found based on the parameters of a sedan at last. This assist character is fit for the control rule of the EPS system through analyzing this character. The assist character figure offers reference for system design and control. Furthermore, this research method has generality for assist character of different kinds of vehicles.
基金supported by the National Natural Science Foundation of China(51775325)Hong Kong Scholars Program of China(XJ2013015)。
文摘In this paper,we propose an improved torque sensorless speed control method for electric assisted bicycle,this method considers the coordinate conversion.A low-pass filter is designed in disturbance observer to estimate and compensate the variable disturbance during cycling.A DC motor provides assisted power driving,the assistance method is based on the realtime wheel angular velocity and coordinate system transformation.The effect of observer is proved,and the proposed method guarantees stability under disturbances.It is also compared to the existing methods and their performances are illustrated through simulations.The proposed method improves the performance both in rapidity and stability.
文摘In combination with the augmented reality (AR) technology and Hololens device, an electric power work assist system is developed to provide a more realistic and convenient training experience for electric power training. The training effect was improved, and help guidance information was provided in the actual operation of electric power work. Experimental results show that difficulty of electric power work is reduced and the efficiency of actual work is improved.
文摘目的:观察助力电刺激训练对脑性瘫痪(脑瘫)患儿核心稳定的疗效。方法:从2011年11月—2012年9月在上海交通大学医学院附属新华医院康复医学科就诊的脑瘫患儿中选择19例痉挛型脑瘫患儿,按就诊顺序分为2组,观察组10例接受包括助力电刺激在内的康复治疗,对照组9例接受常规康复治疗。患儿入组后分别于治疗前、治疗3个月后采用粗大运动功能量表(gross motor function measure,GMFM88)和表面肌电图仪对患儿进行评估,分析脑瘫患儿治疗前后粗大运动功能量表中B区(坐位)、D区(站立位)、E区(行走、跑和跳)及腹直肌、竖脊肌表面肌电信号均方根值(RMS)的变化。结果:观察组、对照组患儿粗大运动功能(GMFM88、B、D、E区)及腹直肌RMS值、竖脊肌RMS值治疗前差异无显著性意义(P>0.05)。康复治疗3个月后,观察组GMFM88、B、D、E区粗大运动评分、腹直肌RMS值、竖脊肌RMS值显著高于治疗前(P<0.01),对照组GMFM88、B、D、E区粗大运动评分、腹直肌RMS值、竖脊肌RMS值高于治疗前(P<0.05)。观察组治疗后GMFM88、B、D、E区粗大运动评分、腹直肌RMS值、竖脊肌RMS高于对照组,差异有显著性意义(P<0.05)。结论:助力电刺激训练有助于改善脑瘫患儿的核心稳定性。
