问题 问答题 简答题

简述车轮转速传感器的组成及工作原理?

答案

参考答案:

主要由永磁性磁心和感应线圈组成。

电磁感应式车轮转速传感器的工作原理:汽车行驶时,齿圈随车轮转动,磁心对应的齿圈部分在齿顶与齿根之间变化,从而使通过感应线圈的磁通量发生变化,产生交变电压,交变电压的频率及大小与齿圈的转速成正比;ECU通过感应线圈送来的电压信号的频率来确定车轮的转速,通过电压信号的频率变化率来判断车速的圆周加减速度。

单项选择题 A1/A2型题
单项选择题

阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。学科&网

Hundreds of people have formed impressions of you through that little device(装置) on your desk. And they’ve never actually   41   you. Everything they know about you   42   through this device, sometimes from hundreds of miles away.   43   they feel they can know you   44   from the sound of your voice. That’s how powerful the   45   is.

Powerful, yes, but not always   46  . For years I dealt with my travel agent only by phone. Rani, my faceless agent whom I’d never met   47  , got me rock-bottom prices on airfares, cars, and hotels. But her cold voice really   48   me. I sometimes wished to   49   another agent.

One morning, I had to   50   an immediate flight home for a family emergency. I ran into Rani’s office   51  . The woman sitting at the desk,   52   my madness, sympathetically jumped up. She gave me a   53   smile, nodded while listening patiently, and then printed out the   54   immediately. “What a wonderful lady!” I thought.

Rushing out   55   I called out over my shoulder, “By the way, what’s your name?” “I’m Rani,” she said. I turned around and saw a   56   woman with a big smile on her face waving to wish me a safe trip. I was   57  ! Why had I thought she was cold? Rani was, well, so   58  .

Sitting back in the car on the way to the airport, I figured it all out. Rani’s   59  ---her warm smile, her nods, her ‘I’m here for you’   60  ---were all silent signals that didn’t travel through wires.

60()

A.explanation

B.attitude

C.concept

D.Behavior