| |
Fault Detection Evaluation of Microcontroller Dyad Control System by Fault Injection Method
| [View]
[Download]
|
| Author(s) |
Ž. Hocenski; G. Martinovic |
| Abstract |
The fault detection methods are very important in the fault-tolerant system design. The redundancy is
the basis for the fault tolerance, but it is used in the fault detection also. One of the basic fault
detection methods is the duplication with comparing. The duplication could be done on several levels
in hardware and software. The control system based on microcontrollers in dyad are presented in this
paper. The microcontrollers in dyad are used for increased reliability and fault tolerance. They are
loosely coupled with task synchronization at checkpoints. The results of operation are exchanged
and compared at a checkpoint. Depending on two types of software the behavior of such duplicated
system could be done for the increased availability or for the increased safety. By the safe application
both units must reach an agreement at each checkpoint, otherwise the system outputs will be disabled.
In a highly available application a valid unit continues to work after disagreement at a checkpoint.
Therefore both units must have the self-checking capabilities. The evaluation of used fault detection
methods and fault tolerance is done by experiments using the fault injection method. The fault
injection system is based on a personal computer, which controls the experiment and collects the
results. The bus signals activity is used in calculation of the probability of the fault occurrence. The
fault recovery coverage is evaluated based on the registered number of faults and the probability of
the fault occurrence. |
| Download |
| Filename: | EPE1999 - PP00609 - Hocenski.pdf |
| Filesize: | 159.5 KB |
|
| Type |
Members Only |
| Date |
Last modified 2004-12-10 by System |
| |
 |