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Study on Characteristic of Electric Power Assist Steering System 总被引：1，自引：0，他引：1
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. 相似文献
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A speed-sensorless vector control system for induction machines （IMs）is presented, According to the vector control theory of IMs, the rotor flux is estimated based on a flux observer,and the speed is estimated through the method of q-axis rotor flux converging on zero with proportional integral regulator, A 0.75 kW,50 Hz,two-pole induction machine was used in the simulation and experimental verification, The simulation model was constructed in Matlab. A series of tests were performed in the field weakening region, for both no-load and loaded operation. The estimated speed tracks the actual speed well in the based speed region and field weakening region （ 1 per unit value to 4 per unit value）. The small estimation error of residual speed is due to the existence of slip. 相似文献
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高速条件下 ,无刷直流电动机的电流换向产生严重滞后 ,导致转矩下降并伴随脉动 .采用超前导通控制法 ,可有效加快换向过程 ,改善转矩输出能力 ;并采用改进的黄金分割法寻优 ,在线调整最优超前导通角 .仿真与实验结果验证了该控制方案的可行性与有效性 相似文献
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分析和推导了交交变频传动系统中环流与无功的关系 ,给出了无功检测与控制原理 ,采用基于环流调节的无功控制方法设计了数字式有环流交交变频异步机传动矢量控制系统 ,并在 Matlab中 Simulink环境下进行系统仿真 .仿真结果表明系统具有很好的无功控制效果和较高的伺服性能 . 相似文献
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