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To improve safety, reliability, and efficiency of automotive vehicles and other technical applications, embedded systems commonly use fault diagnosis consisting of fault detection and isolation. Since many systems are constructed as distributed embedded systems including multiple control units, it is necessary to perform global fault isolation using for(More)
In fault detection and isolation, diagnostic test results are commonly used to compute a set of diagnoses, where each diagnosis points at a set of components which might behave abnormally. In distributed systems consisting of multiple control units, the test results in each unit can be used to compute local diagnoses while all test results in the complete(More)
A common approach to design diagnostic systems is to use residual generators. These generators are usually constructed considering all the model equations. However, there are several advantages of instead consider small subsets of model equations, so called minimal structurally singular (MSS) sets of equations. This paper presents a new method for finding(More)
Over the last years, the emission and on board diagnostics legislations for heavy duty trucks are getting more and more strict. An accurate engine model that is possible to execute in the engine control system enables both better diagnosis and lowered emissions by better control strategies. The objective of this thesis is to extend an existing mean value(More)
The set of diagnoses is commonly calculated in consistency based diagnosis, where a diagnosis includes a set of faulty components. In some applications, the search for diagnoses is reduced to the set of diagnoses with minimal cardinality. In distributed systems, local diagnoses are calculated in each agent, and global diagnoses are calculated for the(More)
The objective of this master’s thesis is to develop a method for automatic design of diagnostic systems for pulp and paper industry. General models for fluid systems are presented. The models simulate slow dynamics based on object-oriented sub-models. The sub-models are tanks, pipes, control valves, pumps, mixers and dividers. The diagnostic systems are(More)
Safety is of major concern in many applications such as in automotive systems and aerospace. In these applications it is standard to use fault trees, and a natural question in many modern systems that include sub-systems like diagnosis, fault tolerant control and autonomous functions, is how to include the performance of these algorithms in a fault tree(More)
Fault diagnosis is important for automotive vehicles, due to economic reasons such as efficient repair and fault prevention, and legislations which mainly deals with safety and pollution. In embedded systems with dozens of electronic control units that states local diagnoses, it can be arbitrary difficult to find which combination of local diagnoses that(More)
The objectives for this master’s thesis are to develop a model of volumetric efficiency for a diesel engine equipped with a Variable Geometry Turbine, study other existing models and test the models using real engine measurements. In this work measurements from two different Scania diesel engines have been used to identify the parameters in the models and(More)
One of the most important factors in the operations of many cooperations today is to maximize profit and one important tool to that effect is the optimization of maintenance activities. Maintenance activities is at the largest level divided into two major areas, corrective maintenance (CM) and preventive maintenance (PM). When optimizing maintenance(More)