基于轮速计算的乘用车小备胎识别策略开发及应用

Strategy and Application for Passenger Car Mini Spare Tyre Detection Based on Wheel Speed Calculation

汽车小备胎具备占用空间小,成本低廉的优势,在各类乘用车均得到较广泛的应用。但小备胎在滚动半径,轮辋偏置距等参数上与全尺寸备胎有一定差别,影响驾驶员在加速、制动及转向中的体验及行驶安全。通过对安装了小备胎的轮速进行计算,设置小备胎轮速识别门限,并建立小备胎识别状态机,整车搭载的控制单元如整车控制器,车身电子稳定控制系统等,可在车辆行驶一定时间后侦测到车辆是否安装小备胎。控制单元通过发送备胎识别总线报文,使整车关联节点接收到小备胎使用信息,针对小备胎的安装,提示驾驶员谨慎驾驶,调用动力控制单元驾驶模式,从而降低小备胎行驶中的安全风险,提升驾驶员驾驶体验。

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.