赵子行1，方晓鹏1，孟媛媛1，董秀云1，王文丽2
1.潍柴动力股份有限公司，山东 潍坊 261061； 2.盛瑞传动股份有限公司，山东 潍坊 261061
摘要：基于车载诊断（on-board diagnostics, OBD）系统鲁棒性的概念和试验方法，研究平均值防抖、驾驶循环次数防抖、m/n防抖、事件上升/下降计数防抖、事件连续计数防抖等处理方法对OBD系统鲁棒性风险影响。研究发现：随着平均次数的增加，平均值防抖处理的可接受的最差性能（worst performances acceptable, WPA）有效件4σ限值逐渐升高并趋于稳定，不可接受的最好性能（best performances unacceptable, BPU）有效件2σ限值降低并趋于稳定；随循环次数的增加，驾驶循环次数防抖处理可降低WPA件的Ⅰ型风险，但BPU件的Ⅱ型风险呈线性小幅增加；随着m的增加，m/n防抖处理方法WPA件的Ⅰ型风险逐步降低并趋于稳定，但BPU件的Ⅱ型风险由逐步升高变为陡增；针对不限定诊断事件次数的策略，使用事件上升/下降计数防抖处理或事件连续计数防抖处理均能控制WPA件的Ⅰ型风险，随着诊断事件次数增加趋于稳定。不同的防抖处理方法对WPA件的Ⅰ型风险和BPU件的Ⅱ型风险影响不同，应根据诊断策略和产品问题选择合适的防抖处理方法，提高OBD系统鲁棒性。
关键词：SCR效率诊断；防抖处理方法；OBD系统鲁棒性
Abstract：Based on the concept and analysis method of OBD system robustness, the risk of the robustness of OBD system is analyzed impacted by different debouncing method of average, driving cycle, m/n, event by up and down, event in a row. It is concluded that, with the increasing number of averages, the 4σ limit of WPA increase and the 2σ limit of BPU decrease. With the increasing number of driving cycles, the risk of WPA type Ⅰ decrease sharply, while the risk of BPU type Ⅱ increase linearly and it remains acceptable. With the increasing number of m from m/n debouncing method, the risk of WPA type Ⅰ decrease gradually and finally balanced, the risk of BPU type Ⅱ increase sharply. For the strategy with unlimited number of diagnostic events, event by up and down and event in a row debouncing method can increase the risk of WPA type Ⅰ gradually and finally balanced. Different debouncing methods have different effects on the risk of WPA type Ⅰ and BPU type Ⅱ. One should choose the suitable debouncing method according to the diagnose strategy and the problem to improve the robustness of OBD.
Keywords:SCR efficiency diagnosis; debouncing method; robustness of OBD system
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