Traction Control
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Traction control, also known by the acronyms ASR (from the German Antriebsschlupfregelung) or TCS (Traction Control System), is an electronic active safety system designed to prevent a vehicle's driven wheels from slipping during acceleration. By using the ABS wheel speed sensors, the system detects when one or more driven wheels are rotating faster than the non-driven wheels, which is a sign of a loss of grip. To correct this situation, the traction control intervenes in two main ways: either by reducing the engine torque transmitted to the wheels (by acting on fuel injection or ignition), or by applying slight braking pressure to the slipping wheel. This action helps transfer torque to the wheel with the most grip and restores optimal traction. Integrated within the Electronic Stability Program (ESP), traction control is particularly crucial on slippery surfaces such as rain, snow, or ice, but it also improves stability and safety during hard acceleration on dry ground, when exiting a corner, or when starting on a hill.
Benefits
- ✓Improved traction and vehicle launch on slippery surfaces (rain, snow, ice).
- ✓Increased vehicle stability and control during acceleration phases.
- ✓Reduced premature tire wear by preventing excessive wheelspin.
- ✓Enhanced active safety, particularly in low-grip conditions.
Learn more
What is traction control (ASR/TCS)?
Traction control, known by multiple names such as ASR (Antriebsschlupfregelung) or TCS (Traction Control System), is a fundamental electronic system for the active safety of modern vehicles. Its primary mission is simple yet crucial: to prevent the driven wheels from losing grip and spinning during acceleration. Whether starting from a standstill, exiting a corner, or on a slippery road surface, this system ensures that engine power is effectively transmitted to the ground, thereby maintaining vehicle control and stability.
Detailed operation of the traction control system
To accomplish its task, the traction control relies on wheel speed sensors, the same ones used by the ABS (Anti-lock Braking System) system. The vehicle's electronic control unit constantly monitors the speed of each wheel. If it detects that a driven wheel is beginning to spin significantly faster than the others, it interprets this as the onset of wheel spin.
Upon detecting a loss of traction, the system can intervene in two ways, often combined:
- Action on the engine: The control unit can instantly reduce engine torque. To achieve this, it can act on the throttle body, reduce the amount of injected fuel, or modify the ignition timing. This power reduction allows the wheel to regain grip.
- Action on the brakes: Via the ABS hydraulic module, the system can apply targeted, short-duration braking pressure to the slipping wheel. This braking effect slows down the wheel and, on a conventional differential, transfers some of the engine torque to the other driven wheel, the one with more grip.
An essential link in overall active safety
Traction control is not an isolated system. It is an integral part of a broader set of safety devices. It is intrinsically linked to the ABS, with which it shares key components. More importantly, it is a sub-function of the electronic stability program, better known as ESP (Electronic Stability Program) or ESC (Electronic Stability Control). While traction control manages longitudinal stability (during acceleration), ESP manages lateral stability by correcting trajectories (understeer and oversteer). The combined action of ABS, ASR, and ESP offers a very high level of active safety, capable of correcting numerous tricky driving situations.
When should traction control be deactivated?
Most equipped vehicles feature a button to deactivate traction control (and often part of the ESP). While keeping it enabled is recommended in 99% of cases, there are rare situations where deactivating it can be useful. This is notably the case if you are stuck in deep snow, mud, or sand. Under these conditions, slight wheel spin can help "dig" to find a firmer surface and get unstuck. Using snow chains may also sometimes require its deactivation. However, it is imperative to reactivate the system as soon as driving conditions return to normal to benefit from maximum protection once again.
Today, traction control is standard equipment on almost all new cars sold in Europe, as it is included in the ESP, which has become mandatory. It plays a silent but permanent role in your driving safety by improving traction, stabilizing the vehicle during acceleration, and preventing loss of control on slippery surfaces. It is a mature and proven technology that contributes every day to making roads safer.
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Associated equipment
ESP
ESP, or Electronic Stability Program, is an essential active safety system in modern vehicles, also known as Electronic Stability Control. Its primary role is to keep the vehicle on the trajectory intended by the driver, by preventing loss of grip and skidding. To do this, the ESP uses a series of sensors (wheel speed, steering wheel angle, lateral acceleration, yaw) that continuously analyze the consistency between the direction desired by the driver and the actual behavior of the car. If a discrepancy is detected, signaling the onset of understeer (the front wheels skid) or oversteer (the rear wheels skid), the system intervenes in a fraction of a second. It independently brakes one or more wheels and can also reduce engine power to bring the vehicle back onto the correct trajectory. Mandatory on all new vehicles sold in Europe since 2014, ESP is an electronic guardian angel that significantly increases safety during emergency avoidance maneuvers, in tight corners, or on slippery surfaces (rain, snow, ice). It works in synergy with other aids such as ABS and ASR (traction control).
Traction control
Traction control, also known by the acronyms TCS (Traction Control System) or ASR (Anti-Slip Regulation), is an electronic active safety system designed to prevent a vehicle's drive wheels from losing grip during acceleration. By continuously monitoring the rotational speed of each wheel using ABS sensors, the system detects when one or more wheels begin to slip, meaning they are spinning faster than the actual speed of the vehicle. When wheel slip is identified, the system's control unit intervenes within milliseconds to restore traction. To do this, it can act in two ways, often combined: either by reducing the engine torque transmitted to the wheels (by acting on fuel injection or ignition), or by applying slight braking pressure to the slipping wheel(s). This process makes it possible to transfer torque to the wheel with the most grip and ensure optimal traction. Closely linked to ESP (Electronic Stability Program), traction control is now an essential standard equipment that significantly improves vehicle safety and stability, particularly on slippery surfaces such as rain, snow, or ice.
Hill Start Assist
Hill Start Assist, also known as 'Hill Holder', is an active safety system designed to make starting on inclined roads easier. Its main function is to prevent the vehicle from rolling backward unintentionally when the driver moves from the brake pedal to the accelerator pedal. The system activates automatically when the vehicle is stopped on an incline with the engine running. Using ESP (Electronic Stability Program) sensors, it detects the slope and maintains braking pressure for a few seconds after the driver releases the brake pedal. This short window of time (generally 2 to 3 seconds) is enough to engage the clutch and accelerate smoothly, without stress, premature clutch wear, or having to use the handbrake. Initially very popular on manual transmission vehicles, this feature is now common on the majority of new cars, including those equipped with automatic transmissions, where it provides extra comfort and safety by eliminating any risk of rolling backward, even slightly.
ASR
ASR, or Anti-Slip Regulation, is an essential active safety system in modern vehicles. Designed to prevent the drive wheels from spinning during acceleration phases, it guarantees optimal traction regardless of road grip. Closely linked to ABS (Anti-lock Braking System) and ESP (Electronic Stability Program), ASR uses the same wheel speed sensors to operate. When it detects that one or more drive wheels are turning faster than the non-drive wheels, a sign of loss of traction, the system intervenes instantly. Its action can manifest in two ways, often combined: by applying slight brake pressure to the slipping wheel to transfer torque to the wheel with more grip, and/or by reducing engine power via the engine control unit. This rapid and precise intervention allows the driver to maintain control of their vehicle when starting on slippery surfaces (rain, snow, black ice) or during sharp acceleration coming out of a corner. Today, ASR is standard equipment on almost all new cars, contributing significantly to accident prevention.
ABS
ABS, an acronym for the German 'Antiblockiersystem' or Anti-lock Braking System in English, is an essential active safety feature on modern vehicles. Its primary role is to prevent wheel lock-up during hard braking or on low-grip surfaces (rain, ice, gravel). During emergency braking, a driver may instinctively slam on the brake pedal, causing the wheels to lock. Locked wheels lose all steering control, turning the vehicle into an uncontrollable projectile. The ABS intervenes by modulating the braking pressure very rapidly and selectively on each wheel, several times per second. This system consists of wheel speed sensors, an electronic control unit (ECU), and a hydraulic control unit. When the ECU detects that a wheel is about to lock, it commands the hydraulic unit to release and then reapply brake pressure. This process, felt by the driver as pulsation in the brake pedal, helps maintain optimal grip between the tire and the road. Thus, the driver retains the ability to steer the vehicle to avoid an obstacle while optimizing stopping distance on most surfaces. Mandatory on all new cars in Europe since 2004, the ABS is the cornerstone of many other driver assistance systems such as ESP and traction control.