| So as we covered in our blog, Wheel Slip is "The ratio | | | | that's applied to the tire by either the car's engine or |
| of the rotational speed of a braked wheel to that of | | | | brakes. This can either decelerate or accelerate your |
| an equivalent free-rolling wheel, expressed as a | | | | vehicle. |
| percentage. The slip is equal to the speed of a braked | | | | -- Laterally: this type of force is generated when your |
| wheel divided by the speed of an unbraked wheel, | | | | vehicle drives around a curve. It makes a car change |
| expressed as a percentage".. according to What this | | | | direction & eventually, the tires issue lateral force when |
| basically means is that the speed of the free-rolling | | | | combined with the ground. |
| wheel & the braked wheel is pretty much a ratio that | | | | If you have Traction Control, then you shouldn't have |
| is shown as a percentage. The formula is as shown: | | | | to worry about this at all. Traction Control was |
| Slip % = Speed of the braked wheel | | | | designed to reduce Wheel Slip & keep a good amount |
| Speed of the unbraked wheel | | | | of traction at the wheels that are driven when the |
| Do you get it? I hope so. I have to admit, it was a little | | | | road is covered in either water or snow. This specific |
| difficult in words, but when I actually drew out the | | | | Traction Control System reduces Wheel Slip by |
| formula, it was a lot easier to understand; right? | | | | braking the actual wheel that is losing traction. This |
| There are actually two types of contact that your tires | | | | technique was designed to work at speeds that are |
| can make with the road that you just so happen to be | | | | below 35 MPH.. or 56 KM/H. |
| driving on: Static Contact & Dynamic Contact. | | | | The control module monitors in the Traction Control |
| -- Static Contact is when the tire & the road are not | | | | oversees the wheel speed very closely. If in the time |
| slipping proportional to each other. The coefficient of | | | | of acceleration the control module perceives Front |
| friction for static contact is usually higher than the | | | | Wheel Slip & the brakes aren't applied, then the control |
| coefficient for dynamic contact; which means that | | | | module will automatically enter something called |
| static contact provides a better traction percentage | | | | "Traction Control Mode". When Wheel Slip is finally |
| for your vehicle. | | | | detected, Traction Control works in this order: |
| -- Dynamic Contact occurs when your tire is slipping in | | | | 1. It closes the Isolation Valves that are normally open. |
| correspondence to the road. The coefficient of friction | | | | 2. The Start pump/motor & supply volume/pressure |
| for this type of contact is lower; therefore, you have | | | | circuits to the hydraulics in the front. |
| less traction.. which may not be so good when you're | | | | 3. Open & close build & decay valves work so that |
| driving in the rain; right? | | | | they can maintain a minimum percentage of Wheel Slip |
| To be quite honest, Wheel Slip can only occur when | | | | & keep maximum traction. |
| the force applied to a tire is greater than the traction | | | | If it were up to me & my car, I'd want to have Traction |
| that is available to that specific tire. The force can be | | | | Control installed on my vehicle to save my car & my |
| applied in one of two ways: Longitudinally or Laterally. | | | | Factory Original 2009 Volkswagen Routan Wheels.. |
| -- Longitudinally: this force comes from the torque | | | | |