Evaluation of Some Fault-Tolerant Methods In Microcontroller Dyads for Safe and High Available Control of Electrical Drives by Fault Injection

Microcontrollers are used for digital control of electrical machines. As the dependability requirements of control systems are growing, fault tolerance is used in control system design. The redundancy is used to increase the persistency or integrity of the control system. The microcontroller dyad is presented in this work. It has two operating modes: highly available mode and fail-safe mode. The evaluation of used fault tolerant methods is done by experiments using the fault injection method. The fault injection system is based on a personal computer, which controls the execution of the experiment and collects the results. The activity of the bus signals is used in calculation of the probability of the fault occurrence. The fault detection coverage is evaluated using the registered number of faults and the probability of the fault occurrence.