Cooling Fan Failure Modes to Enable Development of Automotive ECU Fan Health Monitoring System Cooling Fan Failure Modes to Enable Development of Automotive ECU Fan Health Monitoring System



Published Oct 26, 2023
Alaeddin Banimilhim Jacqueline Del Gatto Hossein Sadjadi


Electronic control units (ECUs) are widely used in the automotive industry. Recent efforts to enable enhanced and automated driving requires these ECUs to process and execute computationally expensive algorithms. With these developments, the ECUs now have a higher computing power and thus are at a greater risk of overheating. This may limit the availability of the essential functionalities in the vehicle. Currently, high operating temperatures are mitigated using passive cooling, which allows heat to dissipate without expelling any energy; however, more robust methods are required to enable this new technology. A cooling fan system is one of the desired methods for ECU thermal management, as this type of system draws cooler air from outside and expels the warm air from within. Therefore, the fan health status is critical to ensure ECU availability and reliability for vehicle operation, as when the fans become degraded, they cannot maintain the required airflow to minimize the ECU operating temperature. Traditionally, fan failures are detected by monitoring the fan speed versus the commanded duty cycle, thus it is desired to develop a robust health monitoring method for the fans. Fan failure mode study and fault injection can be used to enable the development of prognostics. Investigating the fan failure modes results in two main categories, which are internal and external. External fan failures include degradation and cracking of the outer casing, while internal failures include motor and ball bearing issues. Fault injection methods were developed based on these failure modes while considering potential operating conditions. For example, the fans were exposed to multiple environmental conditions, such as dust, humidity, and heat. These conditions can potentially trigger both internal and external failures. The data collection was conducted with the fans running in a standalone setup, being controlled by external equipment to ensure that the electronic input values were known. After running tests for 30 days, sufficient data was collected to enable degradation modelling. The data will contribute to the development of a predictive algorithm which will estimate the state of health of the fan based on its performance over time. This paper will discuss the failure modes and the data generated through simulation and fault injection.

How to Cite

Banimilhim, A., Del Gatto, J., & Sadjadi, H. (2023). Cooling Fan Failure Modes to Enable Development of Automotive ECU Fan Health Monitoring System: Cooling Fan Failure Modes to Enable Development of Automotive ECU Fan Health Monitoring System. Annual Conference of the PHM Society, 15(1).
Abstract 119 | PDF Downloads 67



Electronic Control Unit (ECU), Automotive, Vehicle, Computing Power, Heat, Operating Temperatures, Energy, Passive Cooling, Fan, Motor, Fan Speed, Duty Cycle, Airflow, Fan Failures, Internal Failure, External Failure, Fault Injection, Thermal Management, Health Status, Reliability, Degradation, Health Monitoring, Prognostics, Environmental Conditions, Setup, Equipment, Data Collection, Modelling, Predictive Algorithm, Performance

Hogan, J. M. (1993). The Effect of Fan-Reliability and Cooling-Performance on Electronic-Chassis Reliability. IEEE Transactions on Reliability, 172-174.
Jin, X., Azarian, M. H., Lau, C., Cheng, L., & Pecht, M. (2011). Physics-of-Failure Analysis of Cooling Fans. 2011 Prognostics and System Health Managment Conference, 1-8.
Jin, X., Ma, E. W., Chow, T. W., & Pecht, M. (2012). An Investigation into Fan Reliability. Proceedings of the IEEE 2012 Prognostics and System Health Management Conference (PHM-2012 Beijing), 1-7.
Li, C., Daniel, A., & Ahuja, N. (2016). A New Approach to Predict Fan Failures with Fan Speed Correlation. 2016 32nd Thermal Measurement, Modeling & Management Symposium (SEMI-THERM), 90-94.
Oh, H., Azarian, M. H., Pecht, M., White, C. H., Sohaney, R. C., & Rhem, E. (2010). Physics-of-Failure Approach for Fan PHM in Electronics Application. 2010 Prognostics and System Health Management Conference, 1-6.
Schroeder, B., & Gibson, G. A. (2007). Disk failures in the real world: What does an MTTF of 1,000,000 hours mean to you? FAST ’07: 5th USENIX Conference on File and Storage Technologies.
Tatham, S. (2022, 10 29). PuTTY: A Free SSH and Telnet Client. Retrieved from PuTTY: Home:
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