The principle of operation traction control system

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2019-05-23 10:20:32

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Today in the world of cars practiced many electronic systems and assistants who work with the aim of increasing active and passive safety. Thus, the electronics allows to prevent accidents that occur when the vehicle is in motion. Now all the vehicle must be equipped with such a system, like ABS. But this is not the only system in the underlying list. So, the model class the above staff is equipped with ASR. What is it? This traction control system. The principle of operation and its advantages will be discussed further.

Characteristics

So, what is an ASR? This element of active safety. The action of the ASR is aimed at maintaining contact of the wheels of the vehicle with the road while driving.

traction control system asr

In common the system is called “antibuks”. The official name of the system of automatic control of the slippage. Thus, the work of the traction control system is aimed at protecting the leading pair of wheels from slippage on wet or icy surfaces, as well as the sudden start or during other dangerous maneuvers.

Abbreviation

It is Worth noting that ASR is not the only abbreviation, which is indicated by the system. So, the cars “Volvo” it is marked as STC, «Toyota» - TRC ("Traction Control"), "Opel" - DSA, "Range Rovers" - etc. However, in most cases, to recognize this system it is possible for the first marking. Interestingly, it works the same on all cars. Therefore, we cannot say that ASR on «Volkswagen» worse than the “Audi” and «Mercedes», and Vice versa. On any vehicle it performs the save function of the dynamic rate of the vehicle and works closely with the anti-lock system of the wheels.

Principle of operation

ASR is always active, regardless of the magnitude of the current speed of the vehicle. However, its functionality is slightly different:

  • Speed from 0 to 80 kilometers per hour, the system transmits the torque due to the drag of the drive wheels of the vehicle.
  • At speeds above 80 kilometers per hour effort is regulated by reducing the torque that is transmitted from the engine.
work for traction control

Traction control system Operates on the basis of signals from various sensors:

  • ABS.
  • Frequency of rotation of the wheels.

As a result, the control unit determines the following characteristics:

  • The Speed of movement of the vehicle. Data are presented on the basis of the angular velocity of the wheels on the tag axle.
  • The Angular acceleration of the drive wheels.
  • Motion machine. Distinguish between curvilinear and rectilinear movement of the car.
  • The Amount of slip of the driving wheels. Information is obtained on the basis of the difference of the angular velocity of the wheels on the driving and driven axes.

Depending on the received data, performs control electronics of the brake pressure or acts on the engine itself, reducing its torque.

If we talk about the first case, the control of brake pressure is carried out cyclically. So, in the cycle has several phases:

  • Increase.
  • Hold.
  • Pressure Relief.

The increase in the pressure of the hydraulic fluid contributes to the braking of the drive wheels. This is due to the inclusion of a return pump. This opens the high pressure valve and closes the switch. Due to the return pump helps retain the pressure. And the reset is done after the slipping. The work included the intake and switching valves. This cycle may be repeated several times, depending on the current driving situation.

how to disable traction control

But the torque management is a bit different. This process is carried out in the activation control system of the internal combustion engine. On the basis of signals from sensors of angular velocity of the wheels and the actual torque (measured in ECU) control unit ASR calculates how to lower the power plant. This information is transmitted to the electronic engine control unit. But how does the implementation of these data? Reducing power and torque ASR occurs in several ways:

  • When you change the throttle position (it closes stronger than it should be).
  • Passes the fuel injection insystem.
  • Missing ignition pulses.
  • When cancelling a shift. But this is possible only with the automatic transmission.
  • When changing the ignition timing.
    disable traction control

How the driver understands that the ASR system began to operate?

This driver will inform the special warning light on the instrument panel. At the end of the system and at the exit of the vehicle from slipping, the lamp disappears. The engine and brake system are working as usual.

Advantages

This system is installed on the car not just. It is really beneficial. The main advantage of having ASR – increase of traffic safety. The driver is not insured from errors. However, the electronics are able to correct them and prevent skidding, which can lead to accidents. Also traction control system ASR allows you to extend the life of the engine, since the torque is distributed more smoothly. Another advantage of the system – abrasion-resistance tires, which could occur in case of any slippage. In addition, the TCS has a positive effect on fuel consumption, though only slightly.

How to disable traction control?

If desired, any driver can be forced to disable ASR. For this machine, a special button.

work for traction control

After turning off the traction control system machine will enter the turns with a slide axle. In the case of braking the ABS system will still work. Also on the instrument panel will light the corresponding lamp. It is a yellow flashing triangle with an exclamation point. It illuminates in the time slip of the wheels. And no matter what the current rate – 5 or 100 kilometers per hour.

system

In some cases, it is recommended to forcefully disable traction control? This must be done in the winter when it is impossible to drive in the snow or on the ice surface. After leaving the difficult parts the manufacturer recommends re-enable traction control ASR. The yellow indicator on the panel will go out.

Conclusion

So we learned how to work the traction control system and why it is needed. As you can see, ASR is designed to increase the safety of driving in difficult conditions, eliminating the possibility of slipping and skidding of the vehicle. However, no matter how smart the system was, 100 percent protection, it does not. So you should always rely only on your driving skills and reaction time.


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Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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