Environment-aware estimation of battery state-of-charge for mobile devices
Environment-aware estimation of battery state-of-charge for mobile devices
复制标题
DOI：
10.1145/3302509.3313782
复制
发表时间：
2019-04
期刊：
影响因子：
--
通讯作者：
Liang He;Youngmoon Lee;Eugene Kim;K. Shin
中科院分区：
文献类型：
--
作者：
Liang He;Youngmoon Lee;Eugene Kim;K. Shin
智能手机和平板电脑等移动设备的可靠运行对全球许多用户来说已经变得至关重要。然而，据报道，移动设备经常遭受意外关机的困扰——例如，即使它们的电池显示有高达60%的剩余电量（SoC）也会关机——特别是在寒冷的环境中。发现其主要原因是商品移动设备无法解释电池SoC与环境温度之间的强烈依赖性。为了解决这个问题，我们设计、实现并评估了EA-SoC，这是一种用于移动设备的实时环境感知电池SoC评估服务。EA-SoC采用网络物理方法估算电池SoC，基于(1)网络空间中的热电路模型，捕获电池放电电流、温度和环境之间的物理相互作用，以及(2)经验验证的数据驱动（即网络）模型，用于电池温度和电池电阻之间的物理关系。我们对两款Nexus 5X智能手机进行了35个实验案例研究，以评估EA-SoC。即使在-15°C的环境中，当手机关闭时，EA-SoC报告的SoC平均为3%，而手机内置的燃料计芯片报告的SoC可能超过90%。
Reliable operation of mobile devices, such as smartphones and tablets, has become essential for a great many users around the globe. Mobile devices, however, have been reported to suffer from frequent, unexpected shutoffs - e.g., shutting off even when their batteries were shown to have up to 60% remaining state-of-charge (SoC) - especially in cold environments. Their main cause is found to be the inability of commodity mobile devices to account for the strong dependency between battery SoC and the environment temperature. To remedy this problem, we design, implement, and evaluate EA-SoC, a real-time Environment-Aware battery SoC estimation service for mobile devices. EA-SoC estimates the battery SoC with a cyber-physical approach, based on (1) a thermal circuit model in the cyber space capturing the physical interactions among the battery discharge current, temperature, and the environment, and (2) an empirically validated data-driven (i.e., cyber) model for the physical relations between battery temperature and battery resistance. We have conducted 35 experimental case-studies with two Nexus 5X smartphones to evaluate EA-SoC. EA-SoC is shown to report an average of 3% SoC when the phones shut off even in a -15°C environment, while that reported by the phones' built-in fuel-gauge chips could be over 90%.