Development Of Transmission Loading Test Of Engineering Vehicles

As for the engineering vehicles running in poor condition, the working performance and reliability mainly depend on its transmission. Transmission and drive axle are important parts of the vehicle and their quality will certainly influence the engineering vehicle's performance. Through application of simulation load test bed on the transmission and drive axle load test simulation, the performance can be tested, reliability and quality can be assessed, the development cost can be reduced and the development cycle can be shorten. The test bed adopting common DC Bus drives variable-frequency motor to achieve power input, output of test pieces by the torque sensor, gear box drives loading motor. The power generated by the motor feedback to the driver-side through inverter.Firstly, this article makes a detailed description on transmission test bed at home and abroad,and compares the DC feedback type, exchange feedback, hydraulic feedback type of advantages and disadvantages. Determined according to the needs of users of the test bed work with Common DC Bus and make a description on AC Speed Control System.Secondly, it has an overall design to the test bed, According to Xiamen quality testing institute provided diesel engine torque - speed curve, based on the principle of power matching, configure the drive motor and lift gear box of the transmission load test. According to the measured transmission ratio range, configure the load motor and gear box of the transmission load test. According to torque - speed curve of diesel engines through the measured transmission, configure drive motor and gear box of the drive axle load test bed. According to the mechanical characteristics of wheel-side, configure load motor and gear box of the drive axle load test bed.Once again, in this paper, AC servo frequency control system is studied. Establish the AC servo frequency control system model.Establish transmission and drive axle loading system mathematical model and block diagram, and based on this carry on the simulation analysis. Using the transfer function block diagram model, frequency domain analysis has been made for drive unit speed control system and loading unit torque control system. The influence of flexible loop and Load inertia on the loading system have also been studied by means of simulation analysis.Time domain analysis has been made for the system mentioned above and reveals the influence law of system inherent parameters, controller parameters,and mechanical coupling on dynamic performance of system. Many valuable conclusions have been drawn and supply dependable references to the design of the loading system.In-depth study of the PI control strategy, design of PI controller to improve the dynamic characteristics of the system, the system has a more satisfactory control.