Papers by Keyword: Vehicle Engine

Abstract: Through a systematic analysis of various aspects during the process of vehicle engine lubricating oil storage, transportation and use, this paper set up vehicle engine lubricating oil failure fault tree which chose the failure of vehicle engine lubricating oil as the top event. Through the analysis of the fault tree, the minimal cut sets of fault trees were figured out based on the Boolean algebra method. Besides, the structure importance was analyzed, and thus the failure detection process was given and some preventive measures were recommended.

Abstract: The study focuses on the problem of risk analysis of vehicle engines’ failure. Based on investigation and analysis of vehicle engine, an index system which is suitable for analyzing vehicle engines’ failure is established. And a much perfect technique ANP_FE is introduced into the risk analyzing of vehicle engines’ failure. It has been found that this index system and analyzing technique has a good adaptability, the result could be used as a theoretical proof for the production and improvement. The theory, system, thinking and method could be used as a reference to the similar product.

Abstract: Magneto-rheological (MR) fluid mount demonstrates excellent performance of vibration isolation in a wide frequency range and potential application in engineering. In this paper, a new mixed mode MR mount is proposed and an analytical model is established and used to predict the performance of MR mount. Meantime, a six degrees of freedom dynamic model of an in-line four-cylinder engine which has three points mounting system is derived by considering the dynamic behaviors of MR mount and its state space form is established. LQR and fuzzy-logic controllers are designed and synthesized to actively control the imposed vibration. The simulation results show that the proposed LQR or fuzzy-logic controllers can isolate the vibration of vehicle engine in a wide frequency range. The amplitudes can be suppressed well by employing this mount system. Its effectiveness will be verified via experiment in the second part of this work.

Abstract: In this paper, the transient emissions from vehicle engines was studied, measurement methods and corrections required for higher precision measurements of transient indirect emissions was discussed. Various operating conditions such as cold start, constant torque increasing speed, constant torque reducing speed emissions were considered and the corresponding emission characteristics were obtained and analyzed.