OCS has launched its first automotive-grade ABS wheel speed sensor chip, the OCH4941MF-Q

     Over the century-long evolution of the automobile from a purely mechanical means of transportation into a smart mobile terminal, countless incremental technological advances have collectively shaped today's mobility landscape. Among these key technologies, the wheel-speed sensor—an seemingly unremarkable yet critically important electronic component—quietly safeguards the safety and comfort of every journey in its own unique way.

     From the anti-lock braking system (ABS), which prevents wheel lock-up during emergency braking, to the electronic stability program (ESP), which rescues a vehicle from the brink of loss of control at critical moments, and now to the rapidly emerging fields of autonomous driving and intelligent chassis—where wheel-speed sensors provide real-time, high-resolution data—these technologies have always served as the foundation of all dynamic control. It can be said that without reliable and precise wheel-speed information, there can be no genuine active safety, let alone advanced intelligent driving. Wheel-speed sensors are primarily used in two configurations: magnetic ring applications and back-magnetized magnet–gear combinations; these configurations offer advantages such as more stable output signals that are unaffected by rotational speed, high frequency response, and strong resistance to interference.

     OCH4941 is a automotive-grade Hall wheel speed sensor specifically designed by OCS for the automotive industry, enabling precise vehicle speed detection. Key advantages:

     1. Extremely low jitter—0.5% across the entire temperature range—ensuring the accuracy of vehicle speed detection and providing reliable data for indirect tire pressure monitoring;

     2. Excellent EMC performance, resulting in minimal electromagnetic interference to automotive signal systems; the chip itself offers strong interference immunity and high robustness;

     3. Superior ESD performance, engineered specifically for automotive applications to provide a longer service life and ensure reliable operation under the harsh operating conditions of vehicles.

     The primary application of OCH4941 is as a wheel speed sensor, specifically designed for automotive ABS systems. It features a built-in differential data acquisition module that minimizes interference during vehicle operation, ensures the accuracy of data acquisition, enables precise vehicle control over the wheels, and thereby enhances driving safety.