| With the increasingly strict global emission regulations,a series of energy-saving emission reduction technologies represented by electronic control technology have been widely used in the field of low-speed Marine engines,which make diesel engines reduce fuel consumption and reduce emissions.Hydraulic servo system as a front system in diesel engine electronic control technology,it can injector fuel injection process of electronically controlled fuel injection system,electric control valve opening and closing process of inlet and exhaust system,electronic control injection system of oil cylinder filling process driver,execution,control functions such as role,and the key is electro-hydraulic control valve electric control execution parts.Electro-hydraulic control valve,as an important part of electro-hydraulic conversion,is the key to realize the flexible control of air inlet valve,injector and injector.The research group has completed the development of the electro-hydraulic control valve in the early stage,and the reliability research is an unavoidable obstacle in the transition from the engineering prototype stage in the laboratory to the commercial application stage of industrialization.In this paper,the self-designed electro-hydraulic control valve is taken as the research object,and the injection performance test of the electro-hydraulic control valve is carried out on the existing diesel common rail electro-hydraulic control test bench,which is integrated with the Marine diesel engine fuel injection system,in order to verify the control function and control accuracy of the electro-hydraulic control valve.Set up the reliability test bed and carry out the reliability test research of the electro-hydraulic control valve.FMECA and FTA methods were used to establish the physical failure model of the electro-hydraulic control valve,and the reliability assessment of the electro-hydraulic control valve was completed by virtual augmention-bootstrap method,so as to verify the accuracy of the physical failure model of the electro-hydraulic control valve,and then the health status assessment and performance prediction of the electro-hydraulic control valve were completed.The main contents and conclusions of this paper are as follows:（1）A special test bench for reliability of electro-hydraulic control valve was developed.Complete the overall structure design of the test bed,as well as the calculation and selection of key components such as oil pump,oil rail,etc.Complete the selection of hardware equipment such as monitoring and control unit of test bed such as sensor and acquisition card;The software of solenoid valve performance test and control system is developed by using Labview software to realize the acquisition,conversion,display,analysis and storage of signals.（2）The integration of electro-hydraulic control valve and electronically controlled oil injection system and oil injection performance test were completed.The test results show that the electro-hydraulic control valve can control the normal opening and closing of the injector under the working pressure of 20mpa-30 mpa.At the same time,the measurement and control system can control the injection pulse width and injection frequency of the injector.（3）The failure model of the electro-hydraulic control valve was established,and the actual effect simulation calculation of key components such as the valve core was completed.FMECA and FTA methods were used to establish the collision failure model of the electro-hydraulic control valve.The results show that the relationship between cumulative deformation and working times is logarithmic.（4）Complete the reliability assessment of the electro-hydraulic control valve.Virtual augmentation and Bootstrap method were used to complete the expansion of the reliability data of the electro-hydraulic control valve,and the validity of the data was verified.Using the traditional statistical method,the average service life of the electro-hydraulic control valve is 2010548 times.（5）The leakage model of electro-hydraulic control valve is derived from the collision model.The accuracy of the leakage model is verified by actual samples.After the first group of data was removed,the difference between the two groups of actual samples and theoretical samples was within 5%. |
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