This paper presents adaptive techniques for improving delay fault diagnosis. These techniques reduce the search space for direct probing which can save a lot of time during failure analysis. Given a set of two-pattern tests that resulted in faulty output responses, a procedure for deriving additional two-pattern tests that will improve the diagnostic resolution of delay faults is described. Two...

A new approach is proposed in this paper to detect the stuck faults in linear analog circuits. Ideal switches are inserted to indicate stuck-at, bridging and stuck-open locations. Then the resulting circuit is analyzed and stuck faults are directly identified. A recently developed method for multiple analog fault diagnosis is used eliminating a need for fault dictionary approach. The effect of ...

This paper investigates the path tracking problem for an electric vehicle which has four electromechanical wheel systems under normal and faulty conditions. With considering wheel slip constraints and certain actuator faults, a passive fault-tolerant controller based on variable structure control is developed to maintain the system stability and guarantee the acceptable tracking performance. Th...

Existing methods addressing automated fault detection and diagnosis (FDD) for vapor compression air conditioning system have good performance for faults that occur individually, but they have difficulty in handling multiple-simultaneous faults. The decouplingbased (DB) FDD method explicitly addresses diagnostics for multiple-simultaneous faults for the first time. This paper is the second part ...

Multiple fault diagnosis is a difficult problem for dynamic systems, and, as a result, most multiple fault diagnosis approaches are restricted to static systems, and most dynamic system diagnosis approaches make the single fault assumption. Within the framework of consistency-based diagnosis, the challenge is to generate conflicts from dynamic signals. For multiple faults, this becomes difficul...

We consider a large class of algorithms called “Fan-in algorithms’’ that are useful for problems involving semigroup operations. This paper deals with the design of faulttolerant multiple bus networks (MBNs) suited to run Fan-in algorithms. We present two methodsfor constructing Fanin MBNs with tolerance to bus faults, that have nearly optimal pe$ornaance and processor fan-out. We also present ...

The gases generated in oil filled transformer can be used for determination of incipient faults. Dissolved gas analysis (DGA) of transformer oil has been one of the most power full methods to detect the faults. The various methods such as liquid chromatography, acoustic analysis, and transformer function techniques are require some experience to interpret observations. The researchers have used...

The testability problem of dual port memories is investigated. Architectural modifications to enhance the testability by allowing multiple access of memory cells with minimal overhead on both silicon area and device performance are described. New fault models are proposed and efficient O( n ) test algorithms are described for both the memory array and the address decoders. The new fault models ...

Real-time systems are being increasingly used in several applications which are time-critical in nature. Fault tolerance is an essential requirement of such systems, due to the catastrophic consequences of not tolerating faults. In this paper, we study a scheme that guarantees the timely recovery from multiple faults within hard real-time constraints in uniprocessor systems. Assuming earliest-d...

Networks used in mission-critical applications must be highly fault-tolemnt. W e propose an FDDI-Based Reconfigumble Network (FBRN) that can survive multiple faults. A n FBRN consists of multiple FDDI trunk rings and has the ability to reconfigure itself in the face of extensive damage. W e consider three classes of FBRNs depending on their degree of reconfigumbility: N-FBRN (nonreconfigumble),...