2nd ICAI 2022

International Conference on Automotive Industry 2022

Mladá Boleslav, Czech Republic

2. Problem formulation and methodology

2.1 Problem Formulation To comply with the safety goals, the functional safety concept based on S-FMEA contains safety measures, including the safety mechanisms, to be implemented in the item’s architectural elements and specified in the functional safety requirements. The concept of FSC verification using the S-FMEA is described with the reference solution of S-FMEA for Electric Parking Brake (EPB), which is based on the standard [6], [5]. 2.2 Methodology For each failure cause in S-FMEA model, related safety measures are specified. Two types of safety measures are possible: • Detection measures: e. g. failsafe and monitoring functions. Failure detection action is taken to mean all actions that are suitable for detecting a potential failure when it occurs. In S-FMEA, these are trials, experiment and tests with subsequent analyses until release is achieved • Avoidance safety measures: e. g. functional, technical, design specification, defined test or rare situations of exposure. These failure preventions (or failure reactions) are taken to mean all preventive actions that have been employed in the product/process design with the aim of avoiding failure causes or reducing their probability of occurrence. The S-FMEA takes account of introduced actions that prevent or minimize design failures; the process FMEA those that prevent or minimize process failures. The traceability between the installed safety measures in the S-FMEA, e.g. failsafe and monitoring functions occurrence rating therefore allows the design quality of system Our S-FMEA was created in APIS IQ software with Mechatronics FMEA extension. This extension of APIS IQ software is not an independent editor in the APIS IQ software, but an extended functionality in the failure nets created by APIS IQ in step 3. The mechatronics function can be in APIS IQ activated via the menu Tools | Workstation Settings | Settings by checking the checkbox Enable support for mechatronics FMEA on the General tab. The failure net can be extended by the following elements: at vehicle level to be evaluated. 2.3 Mechatronics FMEA

• Error detection • Error reaction • Operating condition

Error detections and error reactions are derived from functions. That means that functions are dragged by means of Drag & Drop (or by means of Special Drag) into a failure net and defined in there are error detection or error reaction. Error detections and error reactions are secretly created as objected subordinate to the function shortly after the operation was performed by the user. Error detection and error reactions have the same name as the function from which they are derived. Operating conditions

18