Today, the topic of the car most people do not understand why not save it

对于大多数的司机朋友,转速这个概念估计是模糊的,而转速表就只有个大概印象。为什么大多数车主都看不懂,转速表却不能省掉呢?
一、转速表你会读吗?
转速表一般设置在仪表板内,与车速里程表对称地放置在一起。转速表是按照磁性原理工作的.它接收点火线圈中初级电流中断时产生的脉冲信号。并将此信号转换为可显示的转速值。发动机转速越快,点火线圈产生的脉冲次数越多,表上显示的转速值就越大。
转速表单位是1 /min×1000,即显示发动机每分钟转多少千转。转速表能够直观地显示发动机在各个工况下的转速,驾驶员可以随时知道发动机的运转情况,掌握换挡时机来配合变速器挡位和油门位置,使之保持最佳的工作状态,减少油耗,延长发动机寿命。然而,大部分驾驶员都不会看转速表。
二、转速表的作用
对于普通轿车来说,通常都是在开放道路上行驶,司机们关心的是自己是否超速了。这时候,时速表的重要性大大突出,而转速表的地位被削减。尤其是对于自动挡的车来说,换挡有电脑自动控制,除了关注油耗外,驾驶者完全没有必要操心转速。
三、转速表到底意义何在?
1、确定换挡时刻
有不少驾校就是这么传授的——转速上了2000就换挡。虽然这个观点不太对,毕竟每辆车都不一样。但是根据转速换挡这个思想是正确的。
确定换挡时刻非常的简单。如果想要动力性强一点,或者根据上下坡,适当提高转速后再换挡。如果追求经济性的,保持车辆平顺的情况下最低转速换挡就可以了。如果是自动挡车型,建议还是在追求动力性的时候使用手动模式,这样能让车保持一个较高转速而不换挡,达到提高动力性的效果。
2、观察汽车是否启动
相信很多车友们都会遇到一个问题,那就是坐在车内然后就忘了车辆是否启动了。这时候要怎么判断是否启动了呢?就要看转速表了。车在未运行的时候,就会处于怠速状态,转速表的指针应该在700~1000转之间。
3、指示发动机安全运作区域
转速表上面都会有一个红区,一般红区的转速都会在6000转以上。过高的转速下,发动机的润滑,散热效果不佳,且转速过高,超过一些发动机零部件的承受能力,将会对这些零部件造成损坏,所以早期的汽车的转速表上都设置有红线区,用来提醒驾驶员。
但是现在由于汽车技术的发展,发动机的保护机制都比较健全,如果发动机处于极限工况下,一般都会进行切断燃油的保护措施。但是有一些高性能车型或者比较低端的手动挡车型对于发动机的极限宽容度比较高,也需要自己根据安全区域判断发动机的情况。
4、 检查汽车是否出现问题
这就要交给那些技术精湛的汽车工程师了。
比如全身都是传感器的NVH工程师,可以根据仪表的转速信息,来判断和分析异响声音的来源,甚至频率,分贝,车辆振动状况,频率,阶次;再比如发动机、变速器工程师,看一眼转速表,或许就可以判断出车辆起动是否正常,怠速是否正常,行驶中有没换挡,变速器有没有锁止,车辆加速减速是否正常,发动机有没有进入减速停止喷油工况。

如何识别和防范假冒WiFi热点
小小一个转速表,你看不到东西不代表别人就看不到了。对于那些工程师来说,转速表可是迅速了解一辆车子的重要手段。
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For most of the drivers, the concept of speed estimation is fuzzy, but only an impression about the tachometer. Why most owners cannot read, but the tachometer can not be saved?
A tachometer, can you read?
General settings in the dashboard tachometer, speedometer and symmetrically placed together. In accordance with the principle of magnetic tachometer is working. It receives the pulse signal to generate an interrupt when the ignition coil primary current. And the signal can be converted to display the speed value. The faster the engine speed, the more the number of pulses generated by the ignition coil.
The tachometer unit is 1 \/min 1000, which shows the engine RPM thousands turn. Tachometer can visually display the engine speed under different operating conditions, the driver can always know the running condition of the engine, to master the shift timing transmission gear and throttle position, to maintain the best working conditions, reduce fuel consumption, prolong the service life of the engine. However, most drivers do not see tachometer.
Two, the role of the tachometer
For ordinary cars, usually on the open road, the driver is concerned about whether he is speeding. At this time, the importance of the speedometer and tachometer is prominent, the status of being cut. Especially for the automatic car, the shift has a computer automatic control, in addition to concern about fuel consumption, the driver is not necessary to worry about speed.
Three, tachometer what the point?
1, to determine the shift time
There are many driving is taught on the 2000 – speed shift. Although this view is not right, after all, each car is not the same. But the idea of shifting speed is correct.
It is very easy to determine the shift time. If you want a little stronger power, or according to the downhill, appropriate to improve the speed and then shift. If the pursuit of economic, to maintain the smooth ride of the vehicle at the lowest speed shift can be. If it is an automatic model, it is recommended to use the manual mode in the pursuit of power, so that the car can maintain a higher speed without shifting, to improve the effectiveness of power.
2, observe whether the car is started

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I believe that many friends will encounter a problem, that is sitting in the car and then forget about whether the vehicle is started. How to judge whether to start it? To see the tachometer. When the car is not running, will be in idle state, the pointer should tachometer between 700~1000 rpm.
3, indicating the safe operation of the engine area
The tachometer above will have a red zone, red zone speed would turn over in 6000. High speed, engine lubrication, cooling effect is poor, and the speed is too high, more than some parts of engine capacity, will cause damage to these parts, so the early automobile tachometer are arranged on the red zone, to remind the driver.
However, due to the development of automotive technology, the protection mechanism of the engine is relatively sound, if the engine is in the limit condition, the general will be cut off fuel protection measures. But there are a number of high performance models or relatively low end manual block for the engine’s tolerance is relatively high, but also need to judge the situation of the engine according to their own security area.
4, check whether there is a problem with the car
It’s going to be given to the skilled engineers.
For example, all sensor NVH engineers, according to the meter speed information, to determine and analyze the abnormal sound source, even frequency, DB, vehicle vibration, frequency, order; for example, the engine transmission engineer, look at the tachometer, we can estimate the vehicle may start is normal, idle whether the normal driving didn’t shift, there is no transmission lock, vehicle acceleration and deceleration is normal, the engine has not entered the deceleration stop injection conditions.
A small tachometer, you can’t see things not for others to see it. For those engineers, but an important means to quickly understand the tachometer of a car.
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