State-of-charge indication for a secondary battery is becoming increasingly important for battery-operated electronics. Consumers are demanding fast charging times, increased battery lifetime, and fuel gauge capabilities. All of these demands require that the state of charge within a battery be known. One of the simplest methods employed to determine state of charge is to monitor the voltage of the battery. However, this method alone is not a good indicator of battery energy, since both NiMH and NiCd batteries have voltage-versus-energy curves that are essentially flat. This paper presents a more effective method of determining the state of charge in secondary cell batteries. A NiMH battery is used as our test vehicle, since it is one of the more difficult batteries to determine state of charge. This method monitors the battery's temperature, voltage, and discharge/charge rate. A microcontroller then manipulates the information, using look-up tables to determine the state of charge. Also, by modifying the look-up tables, this technique can be employed in many other battery technologies and is not limited to NiMH 相似文献
提出一种优化相关向量机的寿命预测方法,并用于对辅助动力系统(Auxiliary power unit, APU)涡轮的剩余寿命预测。首先,提出了改进的核函数,兼顾效率和精度,用天牛须搜索(Beetle antennae search, BAS)算法对相关向量机的核参数进行优化,建立寿命预测模型;然后,对历史数据进行分析,提取排气温度(Exhaust gas temperature,EGT)并进行修正、降噪,用多项式回归建立了EGT的涡轮性能退化模式库;最后,实例验证表明,文中算法在APU涡轮剩余寿命预测上与传统相关向量机相比效率提高40%,精度提高20%,通过敏感性分析确定了最佳的初始步长和输入维度。 相似文献