关键词: 汽车小备胎；轮速识别；轮速计算；驾驶模式

Abstract: Since automotive mini-spare tyre occupies little space and low-cost, it is well adopted by all kinds of passenger cars. However, mini-spare tyre differs from standard tyre in parameters like rolling radius and rim offset, which influence driving experience and safety when drivers are accelerating, braking and cornering. By calculating the wheel speed of the mini-spare tyre, setting wheel speed threshold for mini-spare recognition and building up mini-spare detection state machine, on-board control units such as vehicle control unit or electronic stability controller, is able to detect whether mini-spare tyre is mounted on the car after certain driving cycles. The designated controller sends the mini-spare recognition signal through CAN-bus so that relevant control units enter mini-spare mode, which is a drive mode designed for mini-spare use, including cautious driving indication, mini-spare performance optimized tuning parameters invocation to relevant control units,in order to minimize the driving risk with mini-spare tyre and improve drivers experience.

Key words: Car mini-spare tyre; Wheel speed recognition; Wheel speed calculation; Drive mode