（续前）一、汽车速度传感器原理与设计汽车速度传感器可分为接触式和非接触式两大类。目前我国绝大部分汽车上的速度表都是以汽车轮胎的旋转速度变换成汽车前进速度进行测速的。这在汽车制动、打滑的情况下，轮胎因新旧、气压高低造成其外圆周长变化都会造成误差过大，甚... (Continued) First, the car speed sensor principle and design Car speed sensor can be divided into contact and non-contact two categories. At present, most of our country’s speedometer on the car is based on the rotational speed of the car tires into the car forward speed for speed. This brake in the car, slippery circumstances, due to old and new tires, the pressure level caused by changes in its outer circumference will cause the error is too large, very ...