The tachometer shows not the speed at which the engine rolls in the car, but how many turns the crankshaft in it turns every minute when the engine is running.
It's a bit like a doctor's stethoscope, telling us the running status of the engine without directly touching the body.
The tachometer of the manual transmission is used to understand the state of the engine and match its own shifting action.
The automatic gear itself listens to the name well, the automatic shift, we do not have to stare at the tachometer, what do you want it to do? Cancel it off.
Which cars have eliminated the tachometer
In fact, some automatic gears are really canceling the tachometer.
Some automatics no longer show the tachometer
Some brands have transformed the tachometer in order to highlight the characteristics.
For example, Rolls-Royce changed the tachometer to be called "Power Reserve", called "Power Reserve", from 100% backwards.
Always remind the owner that in fact, 92% of the strength has not been exerted, want to be fast, and there is still half of the throttle to step on.
What does it mean? The calmness and elegance of the driver and the owner is not how fast it is now, but how much I still have.
Some manufacturers have also turned the tachometer into other forms, for example: French cars have always been more thoughtful, right?
The dashboard is made into a smart digital display screen, the owner himself can choose to display the tachometer or other content, a bit like the mobile phone desktop widget, or smart watch, their own matching, their own play.
The tachometer on new energy vehicles has become an "energy output meter"
Now that the price of oil is getting higher and higher, and there are more and more new energy vehicles, what kind of tachometer do you want, right? New energy has become another form, called the "energy output indicator table".
It is used to indicate the car power output, power reserve, kinetic energy conversion and other information.
Because under the control of the ECU, the motor speed of the new energy vehicle is adjusted by itself, automatically matching the speed and the electric gate, and now it can't be called "throttle", right? switch.
If it is used to show the speed of the motor, in fact, it does not mean much, and I don't care how many times you turn, right?
For example, Xuanyi's e-POWER, the position of the original tachometer has been replaced by an energy information table, the white part on the right shows the current energy output value, and the blue part on the left shows the value of the energy cycle recovery.
What else does that tachometer do?
The tachometer sounds really useless, why is there still in the car?
Used to determine the starting status of the car
Now the car, the overall noise control is also doing better and better, some new cars, sitting on the car can not feel whether the car is starting.
At this time, look at the tachometer, at least know whether it is playing, this is a small point, right?
Judge the fault of the car according to the engine speed
In addition to observing the idle speed, the tachometer can actually reflect the specific operating state of the engine.
When accelerating, whether the speed is rising or not is a very symmetrical rise, or a shake and a shake up, this is called "car condition".
Where is the node of the gearbox shift, even if it is an automatic gear, we can understand this thing.
It's a bit like: the chinese medicine of looking, hearing, asking and cutting this feeling, judging where the whole is uncomfortable, not to say that the cut is open to see, and the blood test is drawn, not the previous concept.
Some experienced teachers can really judge the failure of some simple cars or simply judge the failure of some cars through the tachometer.
Wang Guanghong published a paper in "Cars and Accessories", "BMW F02 acceleration is weak, abnormal speed and stall", which has a case.
A BMW F02 suddenly accelerated weakly during the ride, the engine tachometer floated up and down and would turn off, and after a series of tests by engineers, it was found that the high-pressure oil pump was faulty.
I am not a professional repairman, but if the tachometer pointer is unstable, high and low, then basically look at it is not the same as usual, you should check it, right?
Whether it is manual or automatic, it is actually useful.
Improve the driving pleasure of the owner
On the other hand, many automatic gears now also have manual mode, and we can also switch the timing of gear changes through the judgment of the speedometer like manual gears.
Cameras are now automatic, mobile phones are automatic, what are the extra features of those expensive phones? It's called "manual mode."
You see, the purchase is automatic, expensive, add money that part is called "manual mode", that is, you can adjust it yourself, tune it to have parameters, and the speed is a very important parameter.
For example, in order to highlight the 4.8L V10 high-speed self-priming engine, lexus LFA put the tachometer in the middle of this position, and the speedometer is a very small line.
Another example: Porsche 911 is also designed in the center of the tachometer, and you have to add money to choose another color of the bottom of the watch.
On the one hand, of course, this is to look good, beautiful, and show the essence of the performance car, on the other hand, when you really go off the track, the center of the tachometer is actually more convenient to observe, which is a practical configuration, not a vase configuration.
The automatic gear does not require a tachometer but has practical features
So, in general, in the process of automatically blocking up now, it is really not necessary to look at the tachometer, but there are still some values and meanings, and even functions.
Not directly game over, don't want you, not to, just like saying: now everyone reads less and less paper books, e-book software, e-book tablets, tablets to see, WeChat to see, other things to see.
Is there anyone in the bookstore who doesn't? Are there still books for sale in bookstores? Yes, or in.
Reversing does not count as mileage
After understanding the tachometer, there are odometers, fuel consumption meters, various watches, all kinds of lights on the car...
As an ordinary car owner or user, what do we need to know? Which ones can actually be thrown directly to the car repair master when they see that?
Have you ever found that the fuel consumption meter has never been accurate? Why is it not allowed?
Car insurance fuel consumption, why do some car manufacturers seem to have more models, and some are small? Why do some friends leave messages in the background, he said "spare tire teacher, this is called the happy table, the happy life table"?
These related materials, papers, contents, I collected out that everyone needs a lot, I put all 8 together.
Keyword: dashboard
Want to see is very simple, pay attention to the WeChat public account "spare tire car", reply to the keyword "dashboard" can be.
My public account, every day will give you a piece of practical small dry goods for the car, text version, audio version, video version, the content is the same, pick your favorite form can be.
For example: you drive, you listen to what I recommend, "spare tire car" let's continue to talk tomorrow.
bibliography
WANG Guanghong. BMW F02 accelerates weakly, at abnormal speed and stalls[J].Automotive & Accessories, 2021.