Study On Warranty Service Strategy Formulation And Warranty Policy Design Ofautomotive Product Based On Reliability

Product warranty is a contractual agreement between a manufacturer and a consumer that is entered into upon the sale of a product or service. Based on the current research status of product warranty in the automotive industry and the existing problems in the product warranty management, this thesis studies the warranty service strategy formulation and the warranty policy design of aumototive product in depth. The major results as listed as follows.First, the current domestic and international warranty research literature are classified, reviewed and analyzed in a systematic manner. On that basis, the futher research directions of this theis are summarized.Secondly, the reliability of safety instrumented systems(SISs), which have a great effect on the reliability and risk of automotive product, is evaluated. Currently, the research on the reliability assessment of SISs mainly focuses on the systems operating in the low-demand mode. While the SISs in the auto product are mainly operating in the high-demand mode. Considering the effect of demand rate on the different combination of system failure modes, the system operational mode and the system failure are connected. The different failure combining sequences which lead to the system failure are indentified and analyzed. On that basis, the reliability analysis models are developed for general koon:G voted groups, so as to improve the accuracy of reliability assessment of SISs.Thirdly, the current research on the product warranty service strategy mainly focuses on the products with one-dimensional warranty policy, while the warranty policy of automotive product is usually two-dimensional. According to this limitation, the two-dimensional base and extended warranty policies are integrated. The expected warranty servicing profit model is developed from the perspective of the auto product manufacturer. And the optimal warranty service strategy for the manufacturer is obtained through three-stage process, so as to provide the decision support for the warranty service strategy formulation of automotive product.Fourth, the current warranty servicing strategy research ingores the effection of the customer satisfaction on the total expected warranty servcing cost due to the product failures. According to this limitation, the customer satisfaction to the product performance is incorporated in the warranty service srategy formulation. Under minimal repair strategy and the overhaul stragety, the expeted total cost models for the auto manufacturer are developed respectively. Using two-stage process, the optimal overhaul strategy is obtained and compared with the minimal repair strategy, so as to optimize the warranty service strategy formulation.Fifth, the current research on the design of two-dimensional warranty policy mainly focuses on the base warranty policies, and only considers the corrective maintenance strategy during the warranty service process. Due to this limitation, the research coverage is extended to the life range of the product. The preventive maintenance strategy and the corrective maintenance strategy are integrated. On that basis, the total expected warranty servicing cost model in the life range for the manufactuerer is developed. Finally, the optimal two-dimensional based and extended warranty policies for the manufactuer are obtained through three-stage process,so as to combine the warranty object, warranty coverage and the warranty content in an rational way.