Study On Testing & Control Of Metal V-belt CVT And Photoelectric Torque Sensor

The mechanical Continuously Variable Transmission (CVT) canchange its speed ratio according to the car's driving demandcontinuously. Besides the advantages of common automatictransmission, it also has the advantages of helping the engine andpower train work well together, smooth speed ratio changing and lownoise. It is an ideal transmission. So it has bright future and marketprospect. Metal V-Belt CVT, one of several kinds of CVT (in short ,wecall it CVT in the following text), takes up the dominant place becauseof its special advantages. CVT has developed a lot these years with theelectronic control technology. In the international market, CVT carshave already appeared for many years. But we are lagged behind in thisfield, so the study on this area is of great importance to our ownauto-developing and national automobile industry.After reading a good many of data of this field, the structure character,working principle, kinematics and crucial control techniques areanalyzed elementarily in this dissertation. Because CVT is a compoundsystem involved mechanics, hydraulics and electronics, it needs manystudies and tests to grasp its working principle, control system, thewhole car matching techniques and so on. The dissertation focused onthe control and test system of CVT. To find out the control target andlaws, it needs to develop a test platform. While testing CVT on thisplatform, we need to test many engineering parameters exactly such astorque, stress,rotates peed and so on. Because of the current torque 77吉 林 大 学 硕 士 学 位 论 文sensor cannot fulfill our test task to meet CVT electro-hydraulicsystem, control strategy study and efficiency-improving experiments.We develop a new optical-electronic torque sensor, combined opticsand electronics.The sensor tests the torque by using the formation of the rotary shaft.When torque exerts to the shaft, the relative rotary angle of the twodifferent section of the shaft is in proportion to the acting torque.Based on this point, the sensor is equipped two optical grating plates attwo different place to test the relative angle to get the torque. Duringdeveloping the sensor, we optimized the design of the core part of thesensor-spring element with the advanced software. The test program isalso given in the dissertation. After we filter, plastic, and octavefrequency the sampled signal from A/D plate by hardware, and thenafter change pulse tracing, real time testing and accumulated errorrefreshing, a complete sensor system is made. Among of theprocessing technique, more light should be cast to the several-timefrequency technique. It makes wispier signal recognizing morepossible. This means the torque sensor can get further precision withlow cost. This improved the precision of the sensor without doubt.In the following content, we calibrated the sensor and processed theoutcome of demarcation. The experiments while surging torque input,step torque input and pulse torque input are conducted to test thesensor. Based on the above, we analyzed the linearity, sluggish,repetition character and sensitivity of the sensor. From the outcome ofthese targets, we can say our sensor has the good linearity, repetitionand little sluggish. After these, the model of the sensor is establishedand amplitude analysis and phase analysis are given out. At last, afterconducting two validating experiments of mechanics and electrics, itproves that the sensor we developed can meet the demand of CVTdevelopment platform system.Based on CVT and its test development system, the study and test ofthe optical-electronic torque sensor is given in this dissertation. Thesuccess of the torque sensor development gives the guarantee to the 78AbstractCVT test and control. Besides of this, it can be also used for commontorque test digitally.The creative work in this dissertation:First, combinin...