Leverage simulation is a relatively simple method for qualitative analysis of the kinematics and dynamics of the shift process by replacing the complicated planetary gear mechanism of the automatic transmission with a simple vertically arranged lever system [8, 9]. The simplified model established using the leverage simulation method can be used for real-time control of the target model.
(1) AG4 automatic transmission transmission equivalent lever When the vehicle is in the process of upshift, that is, in the transition process of 1-2 gear shift, only the clutch C1 is combined, and the dynamic equation of the 1-2 stage transition stage is: (2) When the transmission is operating in the 2nd position, the clutch C1 and the brake B2 are combined elements, and the dynamic equation of the 2nd gear of the transmission is: (3) Only the clutch C1 is engaged during the transition from 2nd to 3rd gear. The dynamic equation of the 2-3 stage transitional stage is: (4) When the transmission is in the 3rd gear position, the clutches C1 and C2 are combined and the dynamic equation is: (5) In the formula, εi is the angular acceleration of the component i, that is, the engine Output shaft or pump wheel angular acceleration (rad/s2), ε is the angular acceleration of component 1, ie turbo angular acceleration (rad/s2), ε0 is the angular velocity of the output shaft of the transmission, ie the angular acceleration of ring gear A (rad/s2), ε and ε are the angular accelerations (rad/s2) of the ring gear A and the carrier C in the planetary gear train, Ti is the input torque of the pump wheel, ie, the engine output torque (N.m2), and JA is all solidified with the ring gear A. Rotational inertia of connected components around the output shaft of the transmission, including vehicles and vehicles Wheel turns to the moment of inertia of the transmission output shaft (Kg.
M2).
The improved shift quality control method is based on the fact that the AG4 automatic transmission has relatively poor control flexibility and cannot be adjusted as required. We have designed a new control program for AG4 shift quality through a bench test and developed a combination of shift transitions. New oil pressure changes in the element. That is to say, engine oil cut-off control is used in the 1-2 gear shifting process, and other gear shifting processes adopt the new oil pressure buffer control and timing control.
The AG4 shift quality control scheme shown in the AG4 automatic transmission shift quality control scheme is divided into buffer control, timing control, and engine shut-off control. In order to realize the joint ECU control of the sensor parameters of the power transmission system and the implementation of the shift quality, the transmission ECU and the engine ECU are connected through a data bus. In the shifting process, the transmission ECU transmits a torque reduction signal to the engine ECU to cut off some of the cylinders, reduce the output torque, and reduce the impact during shifting to improve shift quality.
COMPARISON OF REGULATING PRINCIPLES OF HYDRAULIC PRESSURE CHANGES OF THE SWITCHING COMPONENTS WITH THE NEWLY DESIGNED TECHNIQUES FOR UPGRADING PROCESS OF AG4 AUTOMATIC TRANS. The new oil pressure change law is also divided into four processes. Stage A is the stage of oil pressure overflow, stage B is the stage of rapid oil filling, stage C is the stage of hydraulic pressure maintenance, and stage D is the stage of continuous increase of oil pressure. The middle p1 is the oil filling pressure of C1 when the C2 oil pressure drop is 0, p2 is the oil pressure during the oil pressure holding stage, p3 is the maximum oil pressure in the quick oil filling stage B, and p4 is the highest oil pressure after the combining elements are combined. .
The comparison of the hydraulic pressure changes during the downshift process is compared with the current variation of the hydraulic pressure of the AG4 automatic transmission in the downshift process. The new oil pressure change rule is divided into four stages. Stage A is the fast oil return stage of combination element C1. Stage B is the output torque interruption stage of the transmission. Stage C is combined with the rapid increase of oil pressure of component C2. Stage D continues to be filled with oil. Buffering stage. Medium is the maximum oil pressure in the fast oil-fill stage; the highest oil pressure in the buffer stage to continue oil-filling.
AG4 automatic transmission shift process simulation results According to the lever simulation method established AG4 automatic transmission shift process mathematical model, in the MATLAB / SIMULINK environment to build a simulation model. 1 is the initial condition of AG4 automatic transmission simulation, 2 is the vehicle resistance parameter, and 3 is the gear ratio of AG4 automatic transmission.
1 Simulation initial conditions 2 Vehicle resistance parameters Gear ratios of 3AG4 automatic transmission are used in the 1-2 gear shifting process. The other gear shifting process adopts the new oil pressure law control. Therefore, only 2 is performed here. -3 upshift and 3-2 downshift simulation.
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