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Trailer ABS | Antispin Regulation

Anti Spin Regulation (ASR)

Why does ‘wheel spin’ happen?

       In a start-up situation, if excessive acceleration is applied on slippery roads or off road conditions like loose sand and mud, the drive wheels tend to spin. This causes difficulty in starting up. Similarly, if wheel spin occurs while accelerating or steering around a bend, the rear of the vehicle loses stability and tends to swing around. This can be very dangerous.

What does ASR do?

       The system detects through the sensors whether either or both of the drive wheels are spinning. When both wheels spin, the engine power is reduced by reducing fuel delivery, thus controlling the wheel spin. This is achieved with the help of the ASR cylinder mounted on the accelerator linkage. The stroke of the cylinder is regulated by the ECU, by energizing the proportional valve in a controlled manner.

       When only one of the wheels is spinning, and the other wheel is on a surface with good traction, the differential valve of the spinning wheel is energized. This brakes the spinning wheel. Power is transmitted to the wheel on the good tractive surface and helps the vehicle to come out of spin situation. Even in this situation, the engine throttle may be reduced as required by activating the proportional valve.