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A novel Antilock Braking System (ABS) named “M-ABS”, which was based on the novel sensor system named “μ-sensor” has been developed. The performance of the μ-sensor which made the real-time measurement of pure 4 directional forces, that is 3 dimensional forces (Fx, Fy, Fz) and application braking force (Fb), acting on the wheel axle structure was demonstrated. It was confirmed experimentally that the M-ABS made the braking distance decrease and the maneuverability improve considerably, compared with the conventional ABS. The strategy for the dynamic control of the vehicle by employing the output of the μ-sensor also has been discussed.

The conventional antilock brake systems (ABS) control the braking action according to the slip ratio between the wheel and road surface. We are developing another concept of ABS which is controlled based on the wheel-to-road surface friction coefficient. In this system the wheel speed sensors are not required but the friction coefficient detectors are provided. This system controls the brake fluid pressure in such a manner that the brake will always be applied at or near the maximum friction coefficient. As the results of the examination for verification it was found that our ABS functions as ABS preventing locking up of the wheels during braking process.