| Solenoid valve is the core part of gearshift actuator.Its response speed directly determines the response speed of gearshift actuator.Whether the solenoid valve can be opened or closed quickly according to the instruction of TCU directly determines the shifting quality of power shift transmission.To improve the response speed of the solenoid valve in the power shift transmission,in this paper,a kind of integrated design scheme of direct acting solenoid valve is presented.The solenoid valve is composed of a new high driving force density moving coil type electro-mechanical converter and double spring valve body.For further study of the program,in this paper,the parameters of electro-mechanical converter and double spring valve body were optimized,the output characteristics of electromechanical converter and solenoid valve are studied.It provides some ideas and theoretical basis for improving the response speed of gear shift actuator.The specific work is as follows:(1)A new type of integrated design of direct acting solenoid valve is presented.On the basis of the analysis of the structure and process of the transmission,the design requirements of solenoid valve for power shift gear are obtained.On this basis,an integrated design scheme of direct acting solenoid valve is proposed,the solenoid valve consists of a moving coil electro-mechanical converter with high driving force density and a double spring valve body.The structure characteristics and working principle of the scheme are described in detail.The structural characteristics and working principle of valve electro-mechanical converter are described in detail,the mathematical model of electromechanical converter is established.(2)In this paper,the characteristics of electro-mechanical converter are analyzed and optimized.The structure and working principle of moving coil electro-mechanical converter with high driving force density in valve are described in detail,the scheme of the permanent magnet arrangement and the coil framework are compared and analyzed.Multi-objective parameter optimization is carried out for the maximum output force and low fluctuation in the electro-mechanical converter.Determine the structural parameters of each component,and complete the prototype trial production.The static performance test bench of electro-mechanical converter is designed,the output force characteristics of the electro-mechanical converter are tested.The test results show that: When the input current is 10 A,the maximum output force is 159.87 N,The output force fluctuation in the whole working stroke is 4.63%.When the input current is 12 A,the maximum output force is 189.93 N,The output force fluctuation in the whole working stroke is 5.64%.The simulation results and the test results confirm each other,the output force characteristics of the electro-mechanical converter can well meet the direct drive requirements of the solenoid valve.(3)In this paper,the structure of double spring valve is optimized.The double spring structure of electromagnetic valve body and its working principle are described in detail,The advantages of direct acting proportional solenoid valve combined with double spring structure are discussed in detail.The simulink model of output characteristics of solenoid valve is built,the output characteristic of solenoid valve is analyzed by simulation.Select the time multiplied by the oil pressure value of the solenoid valve and the pre-set ITAE criterion of the target oil pressure value as the objective function.The spring stiffness of the electro-magnetic valve body structure,the spring preload stroke,the cover amount of the valve core and the diameter of the valve core were optimized by genetic algorithm.Finally,the spring stiffness of the electro-magnetic valve body was determined to be 2N/mm,the spring preload stroke was 2mm,the cover amount of the valve core was 1mm,and the diameter of the valve core was 15 mm.The prototype of solenoid valve has been manufactured.(4)In this paper,the output characteristics of the direct acting solenoid valve are compared and analyzed by simulation and test.The controller structure of the solenoid valve is designed,the working principle of the controller is described.The performance test bench of direct acting solenoid valve is set up,the output characteristic test of solenoid valve has been completed.The test results show that: The opening time of the solenoid valve is 9ms,and the pressure setting time of the solenoid valve is 69 ms.The power shift time is 113 ms,and the performance of the solenoid valve meets the requirements of the power shift transmission on the solenoid valve. |
PDF Full Text Request