Anti-lock braking control system with fuzzy logic inference engine

This invention utilizes the advantages of high design flexibility and incorporating the intelligence and experiences of experts of fuzzy logic, to provide an anti-lock braking system (ABS) with fuzzy logic inference. The emphasis of this invention resides in that, using the deference between the ideal slip ratio and the actual slip ratio of the vehicle and variation of difference to infer the optimum braking command. Such an optimum braking command is capable of generating a higher-frequency on/off command for controlling electromagnetic valve of a braking mechanism, so as to effectively eliminate the difference in the slip ratio, and the instance where the overshoot and undershoot of the slip ratio, so as to increase the average braking force without causing skidding. By comparison and confirmation, it is proved that this invention is more effective than conventional measures and is able to brake the vehicle in a shorter period of time, while the braking distance is shorter, such that the wheel speed and the vehicle speed are reduced to zero simultaneously. Further, the shaking of vehicle due to excessive braking momentum found in conventional ABS is also eliminated due to the lower variation of braking momentum.