汽车维修怎样检测导线

2025-03-16 12:36:26
推荐回答(1个)
回答1:

  汽车传感器根据应用有超声波传感器、红外传感器、热传感器、振动传感器、加速度传感器等多种传感器,它们由于原理和等级的不同,具有不用的供电电平和输出信号。
  超声波传感器通为“电-声-电”的传感方式,通常为收发一体,它的驱动信号为高频电脉冲,接收信号同样为脉冲波,是不可以用万用表测量的,需要使用示波器。
  红外传感器常见为三线制,即供电、地和信号输出,具体输出为高电平还是低电平需要查阅传感器的数据手册,电平值和供电值有直接关系,可以使用万用表测量。
  热传感器有数字式和模拟式,模拟式可以使用万用表测量,数字式输出的一段数码,需要控制单元进行解码处理显示,或者做数模转换后才能直观测量。
  加速度与振动传感器常见压电式的,可以用万用表测量,根据其信号处理部分电路的不同,有的输出信号是电流,有的是电压,汽车用都属于精度较低等级的。
  发动机内还有较为复杂的电化学传感器和其他物理传感器,其机理和信号更为复杂,建议汽车电路传感部分故障由厂家授权专业维修人员解决,不要自己动手维修。

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