Fault diagnosis strategy of electronic control system of active grille shutter

doi:10.3969/j.issn.1674-8484.2023.01.014

Abstract

Abstract:

Active grille shutter (AGS) is an important technical means to improve the fuel economy of automobiles at present. A fault diagnosis strategy applied to its electronic control system was proposed to improve AGS’s reliability and stability. Based on the software architecture of AGS electronic control system, 4 kinds of fault diagnosis mechanisms were designed for fault diagnosis, and corresponding fault protection measures were put forward. An adaptive algorithm of grilles’ boundary position, which can eliminate the error accumulation caused by aging failure of devices and long-term small-angle and high-frequency operation, was designed to reduce the fault false alarm in the diagnosis process. Finally, the fault injection test and fault false alarm test were carried out based on the self-developed bench, and the designed fault diagnosis strategy was verified. The results show that the designed fault diagnosis strategy can quickly and accurately identify and classified the faults, ensuring the error range in normal operation is limited to 5° and improving the reliability of the whole system.

Key words: active grille shutter, software architecture, fault diagnosis, fault injection

CLC Number:

U463.83

CAO Zijian, WU Changshui, CHEN Li. Fault diagnosis strategy of electronic control system of active grille shutter[J]. Journal of Automotive Safety and Energy, 2023, 14(1): 118-124.

Figures/Tables 13

References 15

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电机类型	BLDC
额定电压	9-16 V
额定电流	300 mA
额定扭矩	2 mNm
峰值扭矩	3 mNm

电机类型	BLDC
额定电压	9-16 V
额定电流	300 mA
额定扭矩	2 mNm
峰值扭矩	3 mNm

故障名称	触发条件	恢复条件
低压故障	V < 7 V 持续800 ms	V > 8 V 持续800 ms
高压故障	V > 17 V 持续500 ms	V < 16 V 持续500 ms
高温故障	θ > 130 ℃ 持续50 ms	θ < 120 ℃ 持续50 ms
欠压故障	V < 6 V 持续800 ms	V >7 V 持续800 ms
过压故障	V >18 V 持续500 ms	V <17 V 持续500 ms
过温故障	θ > 140 ℃ 持续50 ms	θ < 130 ℃ 持续50 ms

故障名称	触发条件	恢复条件
低压故障	V < 7 V 持续800 ms	V > 8 V 持续800 ms
高压故障	V > 17 V 持续500 ms	V < 16 V 持续500 ms
高温故障	θ > 130 ℃ 持续50 ms	θ < 120 ℃ 持续50 ms
欠压故障	V < 6 V 持续800 ms	V >7 V 持续800 ms
过压故障	V >18 V 持续500 ms	V <17 V 持续500 ms
过温故障	θ > 140 ℃ 持续50 ms	θ < 130 ℃ 持续50 ms

故障名称	触发条件	恢复条件
超行程故障	自学习过程中，单方向行程大于120° (90°+ 30°)；执行开度指令过程中，超过额定边界15°	格栅机械结构无故障，自学习成功后故障消除，超行程故障标志位置为0
通信故障	LIN总线通信丢失4 s	在 LIN 总线上监听到显性电平持续时间超过 150 μs
堵转故障	连续2次的堵转工况：自学习过程中，单方向行程小于80°；或者执行开度指令过程中，运行至堵转状态后仍与目标位置相差5°；且无法通过自学习命令清除掉故障	故障消除，自学习成功后，故障标志位置为0