为什么主机厂愈来愈注重CAN一致性测验？

版块：机械制造类型：普通作者：化工产业技术分享查看：85 回复：0 获赞：0 时间：2022-05-18 17:57:58

为什么主机厂愈来愈注重CAN一致性测验？

前语：由于CAN总线各节点质量的不一致而引发的体系瘫痪、过错、死机等问题，会严重影响车辆的安全性，主机厂对CAN一致性的重视度也越来越高，本文将针对CAN一致性测验进行讨论。

CAN一致性测验概述——来历

如图1所示，跟着新能源、智能网联等概念发展，新能源CAN网络节点高达50个，车身CAN总线环境变得复杂及紊乱，CAN节点质量不安稳给主机厂安全性带来要挟。V型开发流程中，零部件没有进行物理层测验就直接给主机厂供货，引发了很多后期保护、安全等问题。所以，CAN总线有必要进行CAN一致性测验。

图1 新能源轿车CAN网络

CAN一致性测验缺失的损害

危险1：采样点不一致

网络中节点采样点的不一致会导致相同的采样频率呈现采样过错，进而使整车网络呈现毛病问题，影响整车环境安稳。

危险2：位时刻不一致

位时刻=1/波特率，当某节点位时刻不一致时，会产生采样过错，过错帧长时刻占用总线，导致CAN总线网络瘫痪。

危险3：信号幅值过低

当幅值过低时，CAN节点会由于搅扰导致幅值下降到0.9V以下，然后呈现位翻转现象，导致CAN总线过错甚至死机。

危险4：边缘过缓

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<h1 class="rich_media_title" id="activity-name" style="margin: 0px 0px 14px; padding: 0px; outline: 0px; font-weight: 400; font-size: 22px; line-height: 1.4; color: rgb(51, 51, 51); text-align: center;" helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" letter-spacing:="" white-space:="" background-color:="" text-align:="">为什么主机厂愈来愈注重CAN一致性测验？</h1><img style="max-width: 800px; max-height: 300%; width: 600px; height: 680px;" src="uploadfiles/images/1429/20220518/175757_nF2WMF.png" title="111.png" alt="111.png" width="600" height="680" border="0" vspace="0"/>前语：由于CAN总线各节点质量的不一致而引发的体系瘫痪、过错、死机等问题，会严重影响车辆的安全性，主机厂对CAN一致性的重视度也越来越高，本文将针对CAN一致性测验进行讨论。 <p style="margin: 10px 8px 15px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); text-align: center;" helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" text-align:="" white-space:="" background-color:="" box-sizing:="" border-box="" overflow-wrap:="" break-word=""><img class="rich_pages" data-copyright="0" data-ratio="2.3333333333333335" data-s="300,640" data-type="jpeg" data-w="6" data-src="uploadfiles/images/1429/20220518/175757_SQEVIV.png" _width="6px" src="https://img73.chem17.com/9/20220311/637825966094787278407.jpg" crossorigin="anonymous" alt="图片" data-fail="0" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; font-size: 14px; letter-spacing: 0.544px; text-align: left; box-sizing: border-box !important; overflow-wrap: break-word !important; height: auto !important; visibility: visible !important; width: 6px !important;"/> CAN一致性测验概述——来历<p style="margin: 0px 8px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" text-align:="" white-space:="" background-color:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word="">如图1所示，跟着新能源、智能网联等概念发展，新能源CAN网络节点高达50个，车身CAN总线环境变得复杂及紊乱，CAN节点质量不安稳给主机厂安全性带来要挟。V型开发流程中，零部件没有进行物理层测验就直接给主机厂供货，引发了很多后期保护、安全等问题。所以，CAN总线有必要进行CAN一致性测验。<p style="margin: 0px 8px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" white-space:="" background-color:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word=""> <p style="margin: 0px 48px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" white-space:="" background-color:="" text-align:="" box-sizing:="" border-box="" overflow-wrap:="" break-word=""><img class="rich_pages wxw-img" data-galleryid="" data-ratio="0.8433420365535248" data-s="300,640" data-src="uploadfiles/images/1429/20220518/175757_EB64Ch.png" data-type="png" data-w="383" _width="334px" src="https://img73.chem17.com/9/20220311/637825966096659290642.png" crossorigin="anonymous" alt="图片" data-fail="0" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important; vertical-align: bottom; height: auto !important; visibility: visible !important; width: 334px !important;"/><p style="margin: 0px 8px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" white-space:="" background-color:="" text-align:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word=""><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important; letter-spacing: 1px; color: rgb(136, 136, 136); font-size: 12px;">图1 新能源轿车CAN网络 <section style="margin: 0px 8px 10px; padding: 0px; outline: 0px; max-width: 100%; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" white-space:="" background-color:="" text-align:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word=""> </section> <p style="margin: 0px 8px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); text-align: center;" helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" text-align:="" white-space:="" background-color:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word=""><img class="rich_pages" data-copyright="0" data-ratio="2.3333333333333335" data-s="300,640" data-type="jpeg" data-w="6" data-src="uploadfiles/images/1429/20220518/175757_SQEVIV.png" _width="6px" src="https://img73.chem17.com/9/20220311/637825966094787278407.jpg" crossorigin="anonymous" alt="图片" data-fail="0" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; font-size: 14px; letter-spacing: 0.544px; text-align: left; box-sizing: border-box !important; overflow-wrap: break-word !important; height: auto !important; visibility: visible !important; width: 6px !important;"/> CAN一致性测验缺失的损害<p style="margin-top: 15px; margin-right: 8px; margin-left: 8px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" text-align:="" white-space:="" background-color:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word="">危险1：采样点不一致<p style="margin-right: 8px; margin-bottom: 15px; margin-left: 8px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" text-align:="" white-space:="" background-color:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word="">网络中节点采样点的不一致会导致相同的采样频率呈现采样过错，进而使整车网络呈现毛病问题，影响整车环境安稳。 <section style="margin: 0px 48px; padding: 0px; outline: 0px; max-width: 100%; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" white-space:="" background-color:="" text-align:="" box-sizing:="" border-box="" overflow-wrap:="" break-word=""><img class="rich_pages wxw-img" data-galleryid="" data-ratio="0.7861111111111111" data-s="300,640" data-src="uploadfiles/images/1429/20220518/175757_SyApAb.png" data-type="png" data-w="360" _width="360px" src="https://img73.chem17.com/9/20220311/637825966099467308383.png" crossorigin="anonymous" alt="图片" data-fail="0" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important; vertical-align: bottom; height: auto !important; visibility: visible !important; width: 360px !important;"/></section> <p style="margin: 0px 8px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" white-space:="" background-color:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word=""> <p style="margin-top: 0px; margin-right: 8px; margin-left: 8px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" text-align:="" white-space:="" background-color:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word="">危险2：位时刻不一致<p style="margin: 0px 8px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" text-align:="" white-space:="" background-color:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word="">位时刻=1/波特率，当某节点位时刻不一致时，会产生采样过错，过错帧长时刻占用总线，导致CAN总线网络瘫痪。<p style="margin: 0px 8px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" white-space:="" background-color:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word=""> <p style="margin: 0px 16px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" white-space:="" background-color:="" text-align:="" box-sizing:="" border-box="" overflow-wrap:="" break-word=""><img class="rich_pages wxw-img" data-galleryid="" data-ratio="0.5653266331658291" data-s="300,640" data-src="uploadfiles/images/1429/20220518/175757_MwicNU.png" data-type="png" data-w="398" _width="398px" src="https://img73.chem17.com/9/20220311/637825966101183319267.png" crossorigin="anonymous" alt="图片" data-fail="0" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important; vertical-align: bottom; height: auto !important; visibility: visible !important; width: 398px !important;"/><p style="margin: 0px 8px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" white-space:="" background-color:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word=""> <section style="margin: 0px 8px 5px; padding: 0px; outline: 0px; max-width: 100%; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" text-align:="" white-space:="" background-color:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word="">危险3：信号幅值过低</section> <p style="margin: 0px 8px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" text-align:="" white-space:="" background-color:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word="">当幅值过低时，CAN节点会由于搅扰导致幅值下降到0.9V以下，然后呈现位翻转现象，导致CAN总线过错甚至死机。<p style="margin: 0px 8px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" white-space:="" background-color:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word=""> <p style="margin: 0px 16px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" white-space:="" background-color:="" text-align:="" box-sizing:="" border-box="" overflow-wrap:="" break-word=""><img class="rich_pages wxw-img" data-galleryid="" data-ratio="0.4104803493449782" data-s="300,640" data-src="uploadfiles/images/1429/20220518/175757_2fQfWX.png" data-type="png" data-w="458" _width="458px" src="https://img73.chem17.com/9/20220311/637825966102587328379.png" crossorigin="anonymous" alt="图片" data-fail="0" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important; vertical-align: bottom; height: auto !important; visibility: visible !important; width: 458px !important;"/><p style="margin: 0px 8px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" white-space:="" background-color:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word=""> <p style="margin-top: 0px; margin-right: 8px; margin-left: 8px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" text-align:="" white-space:="" background-color:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word="">危险4：边缘过缓<p style="margin: 0px 8px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, " helvetica="" pingfang="" hiragino="" sans="" microsoft="" yahei="" font-size:="" letter-spacing:="" text-align:="" white-space:="" background-color:="" line-height:="" box-sizing:="" border-box="" overflow-wrap:="" break-word=""><span style="

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