Abstract: As a promising development direction for new energy vehicles, supercapacitors hold vast application prospects. A supercapacitor management system comprises a master node and multiple sub-nodes, where precise clock synchronization between the master and sub-nodes is crucial for improving the data fusion accuracy of distributed devices. This paper proposes a high-precision clock synchronization method that integrates the network time protocol (NTP) with one pulse per second (1PPS) signals. By recording hardware timestamp anchors of the 1PPS pulse and combining them with NTP-based network time interaction, the method calculates time discrepancies and dynamically adjusts the local clock frequency to achieve high-precision clock synchronization, achieving nanosecond-level synchronization accuracy (error<1 μs). This approach demonstrates a three-order-of-magnitude improvement in precision compared to traditional NTP protocols (millise-cond-level), while maintaining low hardware costs and strong network scalability. It provides a high-precision, cost-effective synchronization solution for high-timing-sensitive scenarios in new energy vehicle power management systems.

Key words: supercapacitor; new energy vehicles; clock synchronization; NTP; rate of time base; rate of time compensation

摘要： 超级电容作为新能源汽车的一个发展方向有着广阔的应用前景。超级电容管理系统包 含主节点及若干子节点，主节点与子节点间需要进行精确的时钟同步，提升分布式设备的数 据融合精度。文章提出了一种融合网络时间协议（NTP）与秒脉冲（1PPS）的高精度时钟同 步方法。通过记录 1PPS 脉冲硬件时间锚点，结合 NTP 网络时间交互，计算时差并动态调整 本地时钟变化率，实现高精度时钟同步。该方法实现了纳秒级时钟同步（误差<1 μs）精度， 较传统 NTP 协议（毫秒级）精度提升三个数量级，且硬件成本低、网络扩展性强。为要求高 时敏场景的新能源车电源管理系统提供了高精度、低成本的解决方案。

关键词: 超级电容；新能源汽车；时钟同步；NTP；时间基数变化率；时间补偿变化率