Investigation On Hardware Reliability Of Sequential Turbocharging Control System With Diesel Engine

Control System Reliability Research is based on the reliability essential theories, it is aburgeoning and marginal discipline about the character of system reliability life. With thecharacteristics of small volume, strong function and capable of realizing complex control,Control System of sequential turbocharging system is more fast, accurate, flexible, reliableand easier to release the optimization under the full condition, also can increase the efficiencyand security of the Turbocharging system. Control system is one of the key technology insequential Turbocharging system, the reliability of the STC control system directly affects onreliability performance and overall performance of diesel engine.In this thesis, based on consulting the associated literature, understanding and graspingthe concept and the theory about the diesel engine electric control system, taking the controlsystem of TBD234diesel engine sequential turbocharing control system for subjectinvestigation, by building the model of the whole system and branch systems, gathering thecorrelative data from relative information, using the stress analysis method to analyze thereliabilities parameters of the components, parts and system, obtaining the overall failure rate,MTBF and the overall working reliability R (t), and the result of analysis and calculationshows that reliability of the system meets the design request.In this thesis, basic components of the GO diagram and analysis of the GO method isintroduced and take GO method of the reset circuit. Processing rules of the mutual signal instate probability algorithm is proposed. Reliability characteristics of the all signal flow in thesystem are obtained by applying GO method to5modules in hardware, and lead to thereliability of each module and the system.Reliability of system sequential turbocharing control system calculated by GO method is0.88986, which is0.9by stress analysis method, so it does not meet the request andoptimization design should be carried out. By analyzing the results, the main influence on thereliability of the system is due to the poor operating environment, insignificance whiledesigning and quality grade of individual major components such as SCM, crystal oscillator isnot high enough，and so on. Reliability can be enhanced by improving the working environment,optimizing the design of the system, improving the quality factor of individual important components.