Development And Research On The Actuating Mechanism Of Automated Control Clutch System

The automated control clutch system does not change the structure of the original clutch and manual shift transmission,and adds a set of automated control device to realize the automated control of the vehicle clutch.It does not need to step on the clutch pedal and relaxes the driver's left foot.When driving,it only needs to control the shift lever according to the road conditions for gear-off and gear-up.The study of automated control clutch system has far-reaching significance for improving the driving safety and comfort of vehicles.As the bottom mechanism,the executive mechanism of automated control clutch system is the executor of clutch action.Its basic function is to manipulate the clutch to separate and engage.The performance of the actuator directly affects the overall performance of the automated control clutch system,and also affects the fuel economy and comfort of the vehicle.Based on the project of "Automated Control Clutch System for compact car "(2012 GH710902),this paper designs and develops the actuator of the automated control clutch system.It mainly studies the design method of the actuator and the influence of design parameters on the separation time,separation stroke,self-locking and service life of the clutch..The specific research work and conclusions are as follows:In this paper,the type selection of actuator and the selection and design method of main parameters are studied based on the compact car.According to the installation space requirements of a compact car and the use requirements of a certain type of car,the selection process and calculation method of the parameters of the actuator are studied,and the parameters of the clutch of a certain type of car are matched and calculated.The main design parameters of the actuator of the automated control clutch system are analyzed theoretically,including the distance from the axis of the main cylinder to the center of the helical gear H,the length of the main cylinder push rod L,the driving radius of the main cylinder R,the limit right deviation angle ?and the limit left deviation angle ?.The clutch separation stroke increases with the decrease of the distance from the axis of the main cylinder to the center of the helical gear H,and decreases with the decrease of the length of the main cylinder push rod L,the driving radius of the main cylinder R,the limit right deviation angle a and the limit left deviation angle ?.The influence of the above parameters on clutch separation time is exactly the opposite of the separation stroke.The influence of friction coefficient ?,pressure angle ?n and helical angle ? on the self-locking performance of helical gear worm reducer is analyzed theoretically.The self-locking property increases with the increase of friction coefficient ? and pressure angle ?n,and decreases with the increase of helical angle ?.Based on one-dimensional simulation AMESim platform,this paper establishes a simulation model of clutch automated control system in a vehicle environment.The physical conditions and performance parameters of engine,clutch,transmission and vehicle are taken as boundary conditions for simulation analysis.The influence of design parameters on clutch separation time and separation stroke is studied.The simulation results accurately reflect that the design method of the actuator can meet the performance requirements of the clutch separation time and travel,ensure the clutch control accuracy and realize the optimal control law of the clutch.The simulation results provide a theoretical basis for parameter optimization of actuator.In this paper,according to the theoretical design method,the sample is made,the comprehensive performance test is carried out,and the test results are analyzed.The actuator can satisfy the requirements of clutch separation time and travel at different ambient temperatures;and through the test verification method,it is determined that the helical gear material PA6TGF30,helical angle 5.16,pressure angle 10.5,worm material 40Cr,surface QPQ treatment process is adopted in the actuator deceleration device,and It is verified that the actuator reducer with the above parameters can achieve self-locking while satisfying the service life.The above tests show that the actuator works stably.The test proves that the main parts of the actuator designed according to the research method in this paper work normally and can meet the design requirements.The theoretical research method is reliable.