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The speedometer in the car. Types and Working Mechanism

The speedometer in the car. Types and Working Mechanism    The function of the car's speedometer or speed indicator in the car's tablet is to determine the level of speed at which the car moves    It is also useful to track miles or distance travelled while driving What are the types of speed meters and what is the principle of each one's work? That's what we convey to you in our article.   


The speedometer in the car.

 Types and Working Mechanism


The function of the car's speedometer or speed indicator in

the car's tablet is to determine the level of speed at which the car moves


It is also useful to track miles or distance travelled while driving

  • What are the types of speed meters

  • and what is the principle of each one's work?

  • That's what we convey to you in our article.


Types of speed meter in cars



Vehicle speed meter types vary depending on the mechanism of operation

As an emerging technique, there was a traditional type that

automakers started to develop as much as any other technology in

the automotive world and reached another more sophisticated

and accurate type; 

These are:

Mechanical speedometer is also called analog

Electronic Speed Meter (Electric)


  • the mechanic shows the vehicle speed by indicator
  • It is connected externally to the engine shaft.


How does the speedometer work in the car?

As mentioned earlier, there are two different types of car meter that

differ from each other with the working mechanism and delivery method

with the vehicle engine. In the following lines, we convey to

you each other's working principle:


Mechanical Speed Meter

Perhaps the highlight of the work of this type of 

car speed meter is that it depends on the basic laws of physics.


The shaft connected to the car's engine rotates the wheel

and cable connected to the car counter, forcing that magnet inside

the speed cup to rotate in the same direction, resulting in a torque that

moves the attached speed cup in the indicator at the same speed.


The speed gauge indicator then moves at the same speed

and when the magnet is slow, which means reducing electromagnetic energy

and the speed cup therefore stops rotating because of

the indicator that holds it in place.


Electronic Speed Meter (Electric)


The way the electric car speed meter works is rather similar to

the mechanical meter, but it has a simpler design

Where the driving column includes a magnet directly connected to

it as the wheels rotate


  1. Magnets pass over fixed magnetic
  2. sensors located nearby
  3. creating a short electric current


The circuit in the electric speed meter calculates the number of

pulses you receive in a short period of time to turn it into speed.


How to adjust the speed meter in the car



It is necessary to calibrate and adjust the vehicle's speed meter to

ensure that the vehicle meter indicators accurately convey 

the torque generated by the magnetic field


Including gear ratios in the drive cable

tire diameter, etc., because they all affect the speed of the car.


Frequently asked questionsabout

the car's speedometer

  • Questions related to the speedometer in the vehicle repeated on
  • search engines, some of which we quote in this article
  • are attached to their answers.


Which is the most accurate between

the two types of car meter?

As mentioned earlier, there are two types of car meters, one mechanical

and the other electric; The mechanic is the oldest version


and has become almost the most widespread electronic meter due to 

speed display clarity, but the two types are equally important and accurate.


  • Can the gauge unit be changed from mile to kilometre per hour?
  • Yes; Can be done from IDrive settings
  • found in the computer information of the painting.


Does tire size affect car speed?

Yes; 

It is known according to Newton's law that the force affecting the vehicle

is equal to the mass multiplied by acceleration, thus increasing the size of

the tyre will reduce the driving force of the tyre, which means

reducing its acceleration on the road.


Here we finish our article on the car speedometer during which we highlighted

the mechanism and types of work of the car's speedometer

along with how to adjust the speedometer


and we answered some frequently

 asked questions about the car's speedometer;


For more information about car parts and the automotive 

and transportation sector in the UAE, we advise you to

visit Dubizzle Automotive Blog and follow everything new.