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线控底盘技术,为什么被称为自动驾驶“基石”?

  • 2026-02-04 11:54:49
线控底盘技术,为什么被称为自动驾驶“基石”?

前几年自动驾驶技术被炒得非常火,各大主机厂也陆续推出了自动驾驶辅助系统,很多人甚至觉得真正的自动驾驶或许很快就会成为现实

但实际上,目前的自动驾驶技术只能做到L3级别,也就是解放驾驶员的手和脚,驾驶员依然需要时刻保持专注,随时准备接管驾驶。当自动驾驶达到L4级别,车辆就具备了自主决策的能力,驾驶员才可以化身为乘客

想要从L3跨越到L4,存在很多技术难点,尤其是在感知、决策和控制这三大核心技术上,很多时候大家都在关注感知和决策层面的技术,比如激光雷达、AI算法。但实际上控制技术才是自动驾驶能否进化的重要因素

今天要聊的线控底盘,就是从控制层面为自动驾驶技术补上了最重要的一环

线控底盘

线控底盘技术通俗一点来说,就是把刹车、油门、转向、挡位、悬挂这五个关键部分,从传统的整体机械硬连接,变成了通过电线连接的线控设计,通过电信号的传递来完成车辆的横向和纵向控制

目前电子油门和电子换挡技术已经非常成熟。比如最开始的油门踏板是拉锁式油门,利用拉线来控制节气门的开度。后来出现了电子油门,当驾驶员踩下油门踏板时,将油门踏板的深浅变化反馈给ECU,经过计算后通过电动机来控制节气门的开度,通过这种方式可以更加快速、精准地控制发动机的进气量。电子换挡技术也是如此,取消了拉线换挡的设计,利用形成电脑完成换挡操作

至于悬架系统,目前的空气悬架已经具备了线性悬架的特点。由空气泵、电磁阀、空气弹簧、减振器和电子控制单元构成,通过空气泵和电磁阀来调整空气弹簧气缸里的空气量和压力,从而改变空气弹簧的硬度和弹性系数,实现车身底盘高度调节

剩下的线控转向系统和线控制动系统,才是目前线控底盘技术急需提升的方面

线控转向系统

传统的汽车转向系统主要分为机械液压助力、电子液压助力、电动助力转向。其中电动助力已经很接近线控转向了,但受制于机械结构,无法改变转向系统的角传递特性,很难满足自动驾驶所要求的自主控制

而线控转向系统是由路感反馈总成、转向执行机构和3个电控单元组成,取消了方向盘和转向执行器之间的传统连接结构

汽车的转向操作不再仅仅听从方向盘的安排,还可以根据路感反馈、主动安全的实时信号,提供精准、及时的转向操作。采用电机直接控制车辆转向,通过通讯装置和集成控制,为自动驾驶汽车实现自主转向提供了良好的硬件基础

线控制动系统

最后的线控制动系统,目前主要有两种解决方案。一种是EHB半线控制动,另外一种是EMB全线控制动

传统的制动系统,是当踩下刹车踏板之后,作用力通过制动推杆推动主缸活塞运动,将液压油传递到轮缸活塞,推动制动蹄与制动轮发生摩擦,起到制动的作用

EHB半线控制动,就是将油门踏板和制动推杆之间的机械连接替换成电信号传递,但是制动力的传递依然还是依靠液压系统,只不过能量源变成了电机

EMB全线控制动,则是要求制动踏板到轮边制动执行机构之间全部通过电信号控制

比较典型的配置就是为每个车轮配备一个电动机作为制动执行器,驾驶员踩下电子制动踏板,经过ECU计算之后,可以为每个车轮施加精准的制动力,这样才能算是真正的线控制动系统

写在最后

如果把汽车技术发展看成是一场赛跑,电动化仅仅只是上半场,智能化才是决出胜负的下半场。线控底盘技术将会是影响整个比赛的关键因素

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  1. CONNECT:[ UseTime:0.000626s ] mysql:host=127.0.0.1;port=3306;dbname=e_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000917s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000381s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000263s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000554s ]
  6. SELECT * FROM `set` [ RunTime:0.000216s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000525s ]
  8. SELECT * FROM `article` WHERE `id` = 462438 LIMIT 1 [ RunTime:0.000478s ]
  9. UPDATE `article` SET `lasttime` = 1771537859 WHERE `id` = 462438 [ RunTime:0.002752s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000696s ]
  11. SELECT * FROM `article` WHERE `id` < 462438 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000498s ]
  12. SELECT * FROM `article` WHERE `id` > 462438 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001330s ]
  13. SELECT * FROM `article` WHERE `id` < 462438 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001243s ]
  14. SELECT * FROM `article` WHERE `id` < 462438 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001139s ]
  15. SELECT * FROM `article` WHERE `id` < 462438 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001041s ]
0.083774s