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

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