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Simulation of hydraulic control system of metal belt type continuously variable transmission; Zhang Baosheng, Zhang Boying, Zhou Yunshan, Wang Hongyan, Influence of vehicle dynamic characteristics. By analyzing the realization process of the hydraulic system, the mathematical model of the hydraulic control system is established, and the control method of the rate change rate is given. The simulation of the acceleration condition shows that the established system model can basically reflect the actual working condition of the hydraulic control system, which provides a theoretical basis for the development of the hydraulic control system. v Descriptor Continuously Variable Transmission Hydraulic Control Simulation In the metal belt type continuously variable transmission, the continuously variable transmission is the core part, and its function is realized by controlling the hydraulic control system. Therefore, the in-depth and detailed analysis of the hydraulic control system is of great significance in the independent development of the continuously variable transmission. 1 The power transmission system model is equipped with a metal belt type continuously variable transmission. The steam transmission power transmission system is a very complicated system, including many Nonlinear link. For the convenience of discussion and satisfying the requirements of practicality, the motor power transmission system equipped with the transmission device is reasonably simplified, and the model 1 model includes the entire power transmission system composed of the engine continuously variable transmission wheel, and the moment of inertia is respectively Simplified to the input and output shafts of the continuously variable transmission, converted to a model system with two rotational masses. The moment of inertia includes the inertia of the engine inertia and the 01 input shaft portion. The moment of inertia includes the moment of inertia translated from the vehicle and the equivalent moment of inertia of the shaft portion. The equation describing the whole system is + Received date 2000326 National Natural Science Foundation funded project No. 50005026 Zhang Baosheng Ji Yiren Automobile Xuexue, Shi Zhixian 6.130025 Chunshan Zhang Boying Jilin University Automobile College Ph.D. student Zhou Yunshan Professor, Jilin University Automobile Institute, S. , l, U.ll, f T The resistance torque acting on the wheel includes rolling resistance.
The wind resistance resistance climbing type 1 can be out, the speed ratio change rate is 3 pairs of vehicle acceleration versus the clamping force control system, and the continuity equation of the hydraulic system can obtain the following relationship with a negative effect. I am idle during the acceleration of the car. If the rate of change of the speed ratio is too large, negative acceleration will occur in the initial stage of vehicle acceleration. Especially when the engine torque is small, this phenomenon will be more obvious. If the engine power is gradually increased, the same level is stepless. When the speed change device acts at a negative speed ratio change rate, the acceleration of the vehicle will increase by one. The above analysis speed has a decisive influence on the dynamic response effect of the vehicle along the speed ratio change rate of the special shift system. The speed ratio change rate is determined by the hydraulic control system and is a parameter to be controlled. Therefore, the hydraulic control system must be analyzed to obtain the control method in the speed ratio change. 2 Hydraulic control system model Metal belt type continuously variable transmission hydraulic control The main function of the system is to ensure that the engine torque is transmitted efficiently and reliably, and at the same time, the continuous change of the speed ratio according to the regular law corresponds to this. Typically, the hydraulic control system can be divided into a clamping force control system and a speed ratio control system. The system 2 clamping force control system is mainly composed of a clamping force control valve, which controls the pressure of the hydraulic system. The pressure directly acts on the driven wheel cylinder. The speed ratio ratio control system mainly includes a speed ratio control valve and a driving wheel. The oil cylinder, through the speed ratio control, twists the oil filling amount of the driving wheel cylinder, thereby changing the pressure in the driving wheel cylinder, and changing the axial position of the moving pulley in the driving wheel group under the restriction of the metal belt The working principle of the control hydraulic control system of the gear ratio is described in the side mode of the liquid system as a distributed parameter system. The clamping force control valve in the system is the relief valve, and the speed ratio control valve is the directional control valve flow control valve speed ratio Aizhong Qn oil pump flow Qp into the speed ratio control system flow Qs escape into the flow wheel cylinder flow 1 Q clamping force control valve is called oil flow flow n driven cylinder and front pipeline total running U oil liquid elastic modulus!
The leakage coefficient of the Cs hydraulic system is the operating pressure versus speed ratio control system of the driven cylinder. According to the energy and continuity equation of the liquid, the relationship between the pressure and the flow of the system can be determined as the outlet pressure of the P ratio control valve. The cylinder pressure Qpc enters the flow of the active 1 cylinder!
d Oil density Lpc speed ratio control valve to active cylinder line length Ap pipe cross-sectional area Cr active cylinder discharge coefficient Vr active cylinder volume Sr1 moving wheel axial, dynamic, speed ratio control valve opening change Depending on the input of the system, it changes the amount of oil in and out of the driving wheel cylinder, causing the change of the system speed ratio. Therefore, in order to understand the factors affecting the rate of change of the speed ratio, the model of the speed ratio control valve must be established. Active control naval ship ç²¼, speed ratio control valve flow coefficient winter action wheel speed ratio control valve opening area is related to the displacement of the valve core, by m57. speed ratio finding valve ceramic core 1 Csr ratio control valve spool sliding Resistance coefficient XP, than the control spool displacement XPl pool than the control column evil position private FsPn cargo preload tension Asr spool cross-section pr, pitot tube pressure KsP elastic coefficient ratio control valve action is driven by the accelerator pedal The force exerted by the throttle control cam on the spool end and the piston force of the engine speed number, 7 acts as a balance of the other force. The displacement of the plunger in the knot 13 corresponds to the opening of the throttle. Represents the target speed at the fixed throttle opening Therefore, the speed ratio control process is equivalent to a closed loop speed feedback control process. When accelerating, the accelerator pedal is depressed to make the plunger displacement, which is equivalent to setting the engine target speed. If the throttle opening degree is large, then Corresponding engine 1 standard speed and the first speed difference between the engine is large, so the displacement of the plunger increases, the spring acts on the valve core, so that the valve core displacement increases, the speed ratio control valve opening area decreases, the speed The ratio of change is larger; on the contrary, the rate of change of the ratio is smaller than the linearity between the 4s that are not called. In order to change the speed ratio change characteristic, the axial movement speed of the upper moving wheel can be.
This mountain type (3) knows the speed ratio change rate and has a complex nonlinear relationship. It is also related to the structural parameters of the belt transmission. Under the same parameter change, different valve opening areas and spool movement amount are used. The nonlinear relationship between them has different effects on the rate of change of the speed ratio. Equation 7 is the key to the interconnection between the hydraulic control system and the powertrain. The rate of change of the speed ratio controlled by the hydraulic system determines the dynamic characteristics of the powertrain from the relationship between the input of the entire system and the control of the hydraulic system. In the steady state, the main driven wheel is in equilibrium under the constraint of the metal strip. The speed ratio remains the same. Therefore, the mountain speed ratio control valve enters the flow of the driving wheel cylinder! Zero, the pressure 1 force is the stomach mark. The target 1 force of the moving wheel balance is a function of the torque transmission torque of the driven wheel cylinder 1 and the speed ratio. When the pressure of the main driven wheel cylinder changes, the system balances the state wave, and the speed ratio is changed for the driving rim. The cylinder, the current pressure and the target pressure of the balance are not available. The speed ratio of the system is ten. The test rate is the rate of change of the small speed ratio and the pressure of the upper moving cylinder, and the left side of the target jade force. =7.;5 drive wheel. The relationship between the lamp speed and the speed ratio may be that the hydraulic control system controls the system pressure change according to the relationship, and the speed ratio change rate can be controlled. Thus, the complex relationship between the speed ratio change rate and the system parameter is simplified to Compared with the pressure and standard pressure difference of the driving wheel cylinder, the idle number relationship is easy to realize the simulation simulation model of the continuously variable transmission vehicle established by the simulation analysis, and the four systems are taxed. The output torque of the engine is calculated by the engine steady-state test data. It is a function calculation of the engine throttle opening degree. The value of the engine speed of the throttle opening port is checked in each sampling period. The corresponding engine output torque 7 is obtained; in the model, the throttle opening change is used as an input signal of the system, and the engine torque is calculated from the engine speed signal. The hydraulic control system controls the rate change rate of the system based on the system input, including the throttle opening speed ratio input torque speed and operating conditions.
The system inputs the speed ratio change rate and the engine torque to the load of 95. The process is simulated. The speed of the magic speed ratio is the change ratio of the speed ratio of the speed tank and the speed of the cylinder and the pressure of the cylinder with time. After the throttle opening is increased, the pressure in the driven wheel cylinder is rapidly increased under the control of the clamping force control valve. The spool of the speed ratio control moves to the left under the action of the spring, so that the driving wheel cylinder is drained and the pressure drops. 51; under the constraint of the metal belt, the speed ratio changes to the low gear direction, and the engine speed increases rapidly, 5 The engine speed increases, the Pito pressure increases, the spool of the speed ratio control valve is pushed to the right, the drain port is closed, and the driving wheel cylinder is filled with oil.
As the pressure of the driving wheel cylinder increases, the pressure in the main driven cylinder is balanced, the engine speed reaches the target speed corresponding to the throttle opening, the speed ratio reaches the corresponding high gear, and the vehicle accelerates at a stable target speed. Reflected in the rate of change of the speed ratio, in the initial stage of acceleration, the active cylinder drains, and the rate of change of the ratio increases in the positive direction. During the process of moving the spool to the right, the drain port is closed, the inlet port is opened, and the intake port is turned to the driving wheel. The cylinder is filled with oil and the rate of change of the speed ratio is negative. As the target pressure value is close, the speed ratio change rate decreases in value. When the vehicle speed is stable, the speed ratio change is zero. 565 is also seen by 5, through the hydraulic system, the rate of change of the speed ratio is well controlled. Accelerated the initial stage of the wish, the car said 1. Jin Jia, satisfied the requirements of the vehicle dynamic and smoothness of the above simulation results and experimental mining, the trend of the system model is correct 4 conclusions in the vehicle Based on the model, the analysis shows that the rate of change of the speed ratio of the continuously variable transmission system is the key factor affecting the dynamic characteristics of the steam. The relationship between the rate of change of the speed ratio and the parameters of the vehicle is simulated, which is of great significance to the design and development and system matching of the automotive continuously variable transmission.
The rate of change of the speed ratio is controlled by the hydraulic system. It has a complex nonlinear relationship with the pressure flow and structural parameters of the system. The rationality of the human transmission system is determined by the change of the balance of the pulley system. The ratio of the ratio of the speed ratio of the team to the speed of the input speed is the result of the 5-key simulation of the hydraulic control system and the powertrain. The simulation model of the continuously variable-speed vehicle can basically reflect the actual working conditions of the system. This model can provide the state for the design and outsourcing of the CVT hydraulic control system! On the basis of the batch 1 Hongyan, Fang Yonglong, Zhou Yunshan and so on. Simulation analysis of the dynamic characteristics of a metal belt type continuously variable transmission system. Automotive Technology, 1999514 2 Fang Yonglong, Zhang Boying, Dong Xiuguo and so on. Metal belt type continuously variable transmission hydraulic control system. Journal of Natural Science of Jilin University of Technology, 2000, 3031, 193 Zhou Yunshan, Qi Xiding, Wang Hongyan. Dynamic modeling of the electronic control system of the continuously variable transmission 01. China Mechanical Engineering, 19983336 5 Wang Hongyan, Fang Yonglong, Zhou Yunshan and so on. Theoretical and experimental analysis of the dynamic characteristics of a metal belt type continuously variable transmission system. Automotive Engineering, 1999525 imitation process. The initial engine speed is set to 15, 17, and the initial vehicle speed is 301. After the car is running at a constant speed of 28, the engine throttle opening is increased to 5, and the simulation result is t.