Reliability Assessment of Automotive Battery Management Systems for Fulfillment of ISO 26262
Date Issued
2015
Date
2015
Author(s)
Huang, Yi-Chen
Abstract
Owing to their low pollution, energy saving, low noise, and other benefits, electric vehicles will be widely used in the near future. However, the batteries of and electric vehicle encounter a few problems including energy loss and storage limitation. Their failures would threaten lives of the driver and passengers of a vehicle and should be paid attention to safety has always been a major concern in the automotive industry. The electric or electronic devices are closely related to the safety of a vehicle. In order to avoid losses caused by failure of a vehicle, the International Organization for Standardization published ISO 26262 which is functional safety standard entitled “Road Vehicles – Functional Safety.” To demonstrate how ISO 26262 can be fulfilled, a battery management system (BMS) used in an electric vehicle is studied from reliability engineering point of view in this thesis. First, the BMS used in an electric vehicle is introduced. The overall architecture and functional safety management of ISO 26262 is introduced briefly afterwards. Emphasis is placed on the concept phase and assessment of the hardware architectures. The required work to implement ISO 26262 to a product is highlighted in particular. Finally, an example of implementing ISO 26262 to the introduced BMS and is carried out. The purpose is to create a completion functional safety management toward the high safety, reliability and quality target to meet ISO 26262 standard for the BMS. In addition, the failure mode and effect analysis (FMEA) of the BMS is performed. The reliability and mean time to failure (MTTF) of the BMS and its components are evaluated. The result shows the MTTF of the studied BMS is 3.79 years. Based on FMEA, it’s found that critical failure modes of the BMS are overheating of battery packs, abnormal signal of the electric control unit (ECU), burned-out ECU, and the explosion of battery packs etc., in sequential order of seriousness.
Subjects
Functional Safety
Battery Management System
Reliability Assessment
Failure Mode and Effect Analysis
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-104-R02522512-1.pdf
Size
23.54 KB
Format
Adobe PDF
Checksum
(MD5):ebfccc985c60fc84b351c5bc376a2900