什么是扭矩传感器 如何对它进行故障检测

Release time:2022-07-20
author:Ameya360
source:网络
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  在日常生活中,我想大家都遇到过类似扭矩传感器故障。一但扭矩传感器发生故障,那么将带来很大的麻烦。严重的话,可能发生交通事故哦!Ameya360电子元器件采购网提醒大家一定要小心,假如你发现这个扭矩传感器发生故障了,你一定要及时的去维修啊。

什么是扭矩传感器 如何对它进行故障检测

  一、什么是扭矩传感器

  扭矩传感器,一般用来测量驾驶员作用在方向盘上力矩的大小和方向,并将其转换为电信号,动力转向ECU接收此信号及车速信号,决定辅助动力的方向和大小,从而在低速行驶时控制转向力矩变小,在高速行驶时控制转向力矩适度增大,它是是电控动力转向系统的重要组成元件之一。

  扭矩传感器目前可分为接触式和非接触式两种,非接触式扭矩传感器又叫滑动可变电阻式扭矩传感器,接触式扭矩传感器是在转向轴与转向小齿轮之间安装了一个扭杆,当转向系统工作时利用滑环和电位计测量扭杆的变形量并转化为电压信号。

      非接触式扭矩传感器中有两对磁极环,当输入轴和输出轴之间发生相对转动时,磁极环之间的空气间隙发生变化,从而引起电磁感应系数的变化,在线圈中产生感应电压,并将电压信号转化为扭矩信号。非接触式扭矩传感器的优点是体积小精度高。如丰田卡罗拉轿车就采用了非接触式扭矩传感器。

  二、扭矩传感器故障行为以及其故障排除

  扭矩传感器故障行为

 一般情况下,当扭矩传感器损坏或性能不佳时会导致转向系统出现以下4类故障:

  1、转向困难;左右转向力矩不同或转向力矩不均;

  2、行驶时转向力矩不随车速改变或方向盘不能正确回正;

  3、组合仪表上P/S警告灯亮起。

  扭矩传感器故障排除

  扭矩传感器信号不稳定,扭矩传感器在使用过程信号不稳定的原因很多,常见的主要有下面三个方面:

  第一,扭矩传感器没有安装好,轴不平行,这样就会导致信号输出不稳定,长期处于这样状态下工作传感器很容易损坏。

  第二,供电电压不稳定,我们扭矩传感器一般是正负15V的双电压供电也有24V或者其它电压供电的,供电电压不稳定也会造成输出信号不稳定。

  第三个原因也是最容易忽视的原因,那就是扭矩传感器旁边其它机器的干扰,比如扭矩传感器旁边如果有变频器就很容易造成输出信号不稳定。解决方法就是给传感器的供电电源前加一个1:1的隔离变压器。



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