Study And Design Of The Testing And Controlling System Of Vehicle Transmission Platform Based On Virtual Prototype

Vehicle transmission system is a main part of a vehicle, which performance directlyaffects the vehicle’s performance in fuel economy, ride comfort, exhausts emissions, etc.Vehicle transmission test rig is specialized equipment for researching overall and sectionaltransmission performance. It adopts modern test-control and computer technology to simulateroad resistance of automobile under various typical operating conditions, to analysis andresearch various performances of automotive transmission system indoors, avoiding theinfluence of external environment on the test results during the road experiment, subsequentlyimproves the accuracy and repeatability of the test.In order to study measurement and control system of the transmission test rig, this articleutilizes ADAMS to built virtual prototype model of the transmission test rig on basis ofdetermining its design scheme. Meanwhile, the author analyzes the dynamic model a vehicleoperates on the road and the transmission test rig, establishes a mathematical model in whichthe dynamometer simulates driving resistance. This resistance model is tested and verified bythe virtual prototype model, the validation results show that the resistance model is capable oftruly reflecting transmission resistance during the running process of the vehicle.The author analysis the dynamic models of vehicle running on the road and transmissiontest rig, introduces a method of simulating driving resistance via loading torque on Eddycurrent dynamometer, and creates a corresponding mathematical model.Based on Eddy current dynamometer’s characteristics, the author analysis its outputtorque control strategy and determines to control the it’s output torque by fuzzy PIDalgorithm. The author improves the response speed and overshoots of the control system viafuzzy control, reduces the steady-state error of the system, via PID control. The authordesigns an Eddy current dynamometer fuzzy PID controller and simulates. Compared fuzzyPID with PID control simulation, the results indicate that fuzzy PID control is much betterthan PID control. On this basis, the Adams/Driveline and Simulink co-simulates on the testrig. The simulation results are consistent with the actual situation.The author designs hardware and software of transmission measurement and controlsystem. The hardware consists of acquisition cards and corresponding sensors based on PXIbus. The software design is based on the NI GUI advanced programming tool Lab VIEWdesign software platform. The author develops transmission test measurement and controlsystem sub-modules, of which one is independent of each other so as to be easily ported to other application areas. Combined with MATLAB，the author himself designs incrementalPID controller and fuzzy control sub-modules, adjusts the input voltage of the inverter,controls the speed and output torque of dynamometer, achieves load control on analogresistance，moreover, according to the requirements of vehicle transmission performance test,the author designs test sub-modules of transmission performance test, establishes transmissionperformance test platform.The vehicle transmission performance test system based on Lab VIEW developed in thispaper has a friendly interface, powerful dialogue, reliable work performance, easy operation,perfect function; we can do real-time monitoring of the drive system as well as display theperformance parameters and can automatically save and print transmission system test results.