Pyöränopeusantureiden

Pyöränopeusantureiden, known in English as wheel speed sensors, are crucial components in modern vehicles. These sensors are responsible for measuring the rotational speed of a wheel. They typically employ either a magnetic encoder (often a toothed ring called a reluctor ring and a magnetic pickup) or an optical sensor. As the wheel rotates, the teeth on the reluctor ring pass by the magnetic pickup, generating a series of electrical pulses. The frequency of these pulses is directly proportional to the wheel's speed. Optical sensors work similarly but use light beams and a coded disc.

The data provided by wheel speed sensors is fundamental to several vital vehicle systems. The most prominent is the Anti-lock Braking System (ABS), which uses individual wheel speed data to prevent wheels from locking up during hard braking, thereby maintaining steering control. Similarly, Electronic Stability Control (ESC) systems rely on these sensors to detect and correct skidding. Traction control systems also utilize wheel speed information to prevent wheel spin during acceleration. Furthermore, some modern vehicles use this data for speedometer readings and cruise control functions. A malfunctioning wheel speed sensor can lead to warning lights on the dashboard and impaired operation of these safety systems.