| Mechanical Engineering |
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| Control strategy for brake clearance adjustment of electronic mechanical brake |
| GE Zheng, WANG Wei rui, WANG Jun ding |
| College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China |
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Abstract Additional mechanical adjusting mechanism or sensors are needed to adjust the clearance of the existing electromechanical brake (EMB), which leads to the increase of the brake volume and the cost. A control strategy of clearance adjustment based on the identification of the critical point of the braking process was proposed in order to solve the problem. The brake and braking process was modeled, and the relationship between motor current and braking process was analyzed. The strategy is to distinguish the two critical points of contact and separation between the brake pads and the brake disk by the differential of the motor current and time respectively. Then the brake pads were brought into contact with the brake disk quickly by controlling the motor speed, and a fixed braking clearance was left after the relief. The theoretical analysis and experimental results show that the strategy can accurately control the braking clearance, thus eliminate the adverse effect of wear on the pads. The response time of the braking force output was obviously shortened. The method provides a lowcost solution for clearance adjustment of EMB.
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Published: 01 January 2017
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Cite this article:
GE Zheng, WANG Wei rui, WANG Jun ding. Control strategy for brake clearance adjustment of electronic mechanical brake. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(1): 138-144.
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电子机械制动器间隙调整控制策略研究
为了解决现有电子机械制动器(EMB)的间隙调整需要附加机械调节机构或传感检测装置,导致制动器体积增大、成本提高等问题,通过对制动器及制动过程的建模,分析电机电流与制动过程的对应关系,提出基于电流信号识别制动过程临界点的间隙调整控制策略.该策略通过电机电流对时间的微分信息,分别识别出摩擦片与制动盘接触和分离的两个临界点.通过控制电机转速,令制动时制动片与制动盘迅速接触,并在缓解后留下固定的制动间隙.理论分析和实验结果表明,该策略可以准确地控制制动器的制动间隙,消除制动片磨损对制动间隙的不利影响,制动力输出响应时间明显缩短,为电子机械制动器的间隙调整提供一种低成本解决方案.
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