周洲+张立成+郝茹茹
摘 要: 在利用滚筒反力式制动性能检测台对汽车制动性能进行检测的过程中,由于粘砂滚筒附着系数较高,汽车在制动时,轮胎与滚筒之间会产生很大的摩擦力,容易发生剥胎现象。因此,合理采集汽车制动性能相关参数的同时,及时关停制动性能检测台驱动电机以保证被检车辆的安全,成为汽车制动性能检测的关键技术之一。通过对现有的汽车制动性能检测中各种控制方法优缺点的比较,提出了一种基于DMA的汽车制动检测台驱动电机控制方法,提高了控制的实时性和灵活性,在采集到汽车制动性能相关参数的同时,最大限度地保护了车辆安全。试验结果表明,该控制策略稳定有效,检测精度高,具有较高的实用性。
关键词: 制动性能检测; 粘砂滚筒; DMA; 驱动电机
中图分类号: TN06?34; TP319 文献标识码: A 文章编号: 1004?373X(2014)18?0152?03
Control method of drive motor in automotive brake tester based on DMA
ZHOU Zhou, ZHANG Li?cheng, HAO Ru?ru
(College of Information Engineering, Changan University, Xian 710064, China)
Abstract: During the process of automotive brake performance test using the roller opposite force automobile brake tester, huge friction force is generated between the tire and the roller due to the high friction coefficient of sticking sand roller, which is prone to tire peeling. Thus, In order to ensure the vehicle safety, the drive motor of the tester is stopped timely as soon as a reasonable acquisition of braking performance parameters is achieved, which has become one of the key technologies of automotive brake performance test. The advantages and disadvantages of various control methods adopted in existing automotive braking performance test are compared. A real?time control method of drive motor in automotive braking performance tester based on DMA (direct memory access) is presented to improve the real?time characteristic and robustness of the control system, as well as protect the vehicle in the acquisition of brake performance parameters. The test results show that the proposed control method is stable and reliable, and has high detection precision and good application value.
Keywords: brake performance test; sticking sand roller; DMA; drive motor
0 引 言
汽车制动性能的好坏直接关系到驾乘人员及车辆的安全,重大交通事故的发生往往与车辆的制动性能不合格紧密联系在一起,因此,在国家的相关法规和国标中都把制动性能检测作为机动车检测的重要内容之一[1?2]。
目前,滚筒反力式制动检测台是机动车安全技术检验机构广泛使用的专门用于检测机动车制动性能的检测设备,能够对汽车的制动率、不平衡率、阻滞率等参数进行检测。该设备的粘砂滚筒一般具有较高的附着系数,可以用来模拟实际路面[3]。实际检测过程中,滚筒反力式制动检测台的驱动电机带动粘砂滚筒转动,并利用摩擦力带动被检车辆的轮胎以相同的速度反向转动,当被检车辆的轮胎在粘砂滚筒上进行制动并出现滑移时,高附着系数的粘砂滚筒和轮胎之间会产生较大的摩擦力。……