Research On Torque Distribution Four-Wheel Drive Vehicle Electronic Control System

This paper studies the planetary gear with the axis active torque distribution devices. This torque distribution devices including the control unit, clutch and differential. Ineffective in the clutch, torque from the engine is not transmitted to the same before and after the bridge. According to the vehicle under normal conditions, as well as around the axis torque distribution of the limited-slip device Open-slip device, dynamic load around the wheel axle forward to determine the proportion of the size of the output torque distribution ratio. This distribution ratio is around the axis torque distribution device forward after the differential output torque distribution ratio. When the redistribution of torque at the control unit can be controlled so that the clutch engagement, and after changing the torque distribution ratio at the right time.As this paper, the full-time four-wheel drive -- is controlled by controlling engine output torque. axis torque distribution device to the rear wheel torque distribution between the achievement and brake torque adjustment This would require developing a set of control strategies so that all control body coordination, give full play to the ground can provide traction control strategy has a direct impact on the life of control and agencies. In vehicles running on different terrain, all wheel torque is not the same need. So we can draw up a set of requirements for different operating conditions and driver intent of the control strategy.It allows vehicles to switch automatically to the roller-skating car in the vertical and horizontal control rate coefficients are very attached to the extent that thus ensuring that the vehicle has good adhesion and traction performance. This dynamic characteristics can be determined more engine torque transmitted to the non-sliding runner. driving torque to improve vehicle performance and utilization. This attachment or on the side of the road driving wheel separation factor is very important when vacancies.In view of this research mainly done the following work :(1) The establishment of a full-time 4WD vehicle driving dynamics control and application of mathematical models Simulink. Choice of a 4×4-terrain vehicle for the study. Diesel vehicle configuration include : electronic control, the mechanical clutch, transmission, and distribution installations around the axis torque, the main reducer. Hydraulic Brake, TCS traction control system. Depending on vehicle structure and dynamics simulation model car driven by the main structure, establish a dynamic model cars. Modules include : driver's intentions mathematical model, engine model, the anterior-posterior axis torque distribution between the device model, transmission model tire model, the vehicle model, brake model, we calculate the wheel dynamic load modules. Tire frame is calculated speed and engine speed calculation module module.(2) Identified torque distribution control strategy. Three different control methods introduced in the corresponding control strategy : a typical situation. increase engine output torque control using the wheel brake control of the Joint Control Strategy; Second, the use of axis torque distribution devices torque distribution between the front axle plant and round after round of bridge between the torque distribution devices for joint control of the control strategies; 3. using engine torque control plus driving wheel brake control and output shaft torque distribution between the joint control policies to regulate and control the torque device strategy.(3) Full-time 4WD vehicle electronic control of torque distribution control system design. On the threshold logic control algorithm, PID control algorithm, synovial variable structure control algorithm, the optimal control algorithm fuzzy control algorithms, control algorithms and neural network expert control algorithms and their advantages and disadvantages. Throttle position controller design, the brake pressure driving wheel torque distribution device controller and current controller.(4) The full-time 4WD control strategy and control simulation. In this paper, several different roads to meet the definition of simulation based on the definition of several different road understanding of the impact of air resistance on smaller cars slopes greater impact resistance of the vehicle. Part of the control strategy paper identified the simulation test.Simulation results show : part determined by the result of this control strategy simulation test drawn using torque distribution control torque distribution control than when used to improve the speed of the vehicle.