Automobile brake is measured for the performance of a very important index, is driving an important guarantee of security personnel. The brake performance of good condition, it directly restricts the other properties of the play to the car. This paper first introduced the automobile brake system, the function of the brake system and principles are discussed. And then expounds the braking system function and brake performance evaluation method. The car brake mainly reflects in braking force, car braking force calculation is the scientific basis of brake performance and ensure the brake performance of an important step. This paper used the B spline function fitting and optimization of the new method, the automobile braking force be simulated and optimization, and the method is analyzed in theory. The analysis shows that by this ?
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