전동식 조향 장치용 ECU 의 환경 내구 시험 시간 단축을 위한 설계 검증 시험 사양 변경 사례

An Example of Modification of Design Validation Test Specification to Reduce the Environmental Durability Test Time of Electronic Control Unit for Motor-Driven Power Steering system

This paper suggests an example of modification of the durability test specifications of electronic control unit for an automotive system in phase of design validation. The basic concept to redefine the specifications of durability test is based on the Arrhenius relationship for accelerated temperature test and the modified Coffin-Manson model for temperature cycle test. The ambient temperature of the powered-event durability test is increased to reduce the required test time of the current specification. Furthermore, the holding time between the events to cool down the temperature of the components is shortened and the resultant temperature rise affects the durability of the components. Thus, the acceleration factor due to the increased temperature range of temperature cycle is also estimated by the modified Coffin-Manson model.