关键词: CANFD；信号质量；信号反射；验收标准

Abstract: Aiming at the problem of poor communication signal waveform quality (such as severe smaller number of nodes, shorter CANFD branch lines, configuring weak terminal resistors for non-terminal nodes, and selecting NXPTJA1645 transceivers with ringing suppression, the signal ringing is minimized and the signal quality is improved. Finally, optimization measures are proposed from aspects of topology reconstruction, harness parameter management and control, and hardware configuration upgrading. Vehicle tests verify that these measures can effectively suppress signal reflection and ringing, avoid misjudgment of recessive bits, and significantly improve the communication reliability of the CANFD bus. This research provides a quantitative basis and practical solutions for the design of automotive CANFD networks and the optimization of signal quality. reflection and ringing) in the application of controller area network flexible data rate (CANFD) bus in the automotive field, this paper conducts research on signal quality analysis and optimization by combining the design requirements of CANFD network system solutions and practical application pain points. Firstly, based on the CANFD sampling principle and the requirements for recessive bit reception threshold, an evaluation method of "level assessment in the 50%~100% interval after the recessive bit" is constructed, and the acceptance criteria for signal quality testing are formulated. Secondly, by using the control variable method, comparative tests are carried out on key influencing factors including network topology, number of nodes, harness design, terminal resistor configuration, and transceiver selection. The results show that when using a topology without nested branches, a

Key words: CANFD; signal quality; signal reflection; acceptance standards