STABILITY CONTROL SYSTEM, SADDLE-RIDING TYPE VEHICLE HAVING STABILITY CONTROL SYSTEM, METHOD AND COMPUTER PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a stability control system for a saddle-riding type vehicle which calculates a slip rate or a slip amount more precisely than conventional technology, and can stably control a posture.SOLUTION: A stability control system is used for changing a brake force or a drive force of a vehicle having a first wheel and a second wheel. The stability control system comprises: a wheel rotation speed sensor which acquires a wheel rotation speed being a rotation speed of the first wheel; a vehicle body speed sensor which acquires a vehicle body speed of the vehicle; a posture detection unit which acquires bank angles of a vehicle body; and a calculator which calculates a value indicating a relationship between a wheel speed of the first wheel and a wheel speed of the second wheel as a tire diameter correction value at each of the different bank angles on the basis of the wheel rotation speed and the vehicle body speed in a prescribed traveling condition, corrects the wheel rotation speed on the basis of the tire diameter correction value corresponding to a current bank angle, and calculates a wheel speed for control. The brake force or the drive force is changed by using the wheel speed for control.