| The automotive transmission is a key component of the car, which is an important component in the automobile transmission parts, its performance has a direct impact on the overall performance of the car. Our company is specialized in heavy truck transmission manufacturers, automobile transmission for decades. In recent years, as our company introduce new technology transmission design and introduction of new technologies and absorbing many new varieties developed transmission. According to the standard "QC / T 568-1999 Auto Test methods for mechanical transmission," the relevant provisions of the new design or a significant improvement of the transmission type test must test the performance of the transmission. To ensure the quality of transmission of new development, shorten the new species transmission of the development cycle, my company's existing testing facilities for the transmission can not meet the existing demand. Development of a technologically advanced, functional and practical Transmission Test Bed was put on the agenda.Transmission Test Stand through the test bed from the open to closed development test bed, which open test platform advantages: simple structure, reliable operation is simple, load stability, low production cost; Its shortcomings: Test power system input device is loaded almost all consumed, energy consumption, energy consumption can not use feedback, pilot projects for high-power long time (such as transmission of heavy vehicle fatigue life testing) of the method is not appropriate use; closed to repeat the test bed because of energy use, energy saving, the current in the test platform is widely used.Correct choice of load testing the way the key to success. Loading present mechanical loading, hydraulic loading, powder loading, eddy current load and power load, etc., in which mechanical loading, hydraulic loading, magnetic eddy current load and load only in certain conditions within the load, they are not loaded unstable, high-speed performance is poor, or low speed can not be loaded, and no one will not cause waste of energy; only the collapse load is the load power back to stable performance, fast response simple structure, high reliability and stability in both high and low speed loading mode.Electrical energy generated by the current load some direct feedback to the grid for the drive motor to use, and some way of using DC bus, the load electrical energy generated by the feedback through the DC bus to the drive motor drives the use of power to the DC bus as the energy transfer between one-way transmission, through the DC bus energy feedback on the grid to avoid electrical interference. DC bus current with the technology more widely in public for most of the motor drive system, whether domestic or foreign, in the majority of transmission test stand is to use AC variable speed system, so that with high-precision adjustment speed system also achieved good energy saving effect.Transmission test stand under current development, combined with our production structure and the actual transmission conditions, the transmission test rig using electric closed and the DC bus feedback approach to design.Commonly used in modern automobile piston engine, because of its constant direction of rotation, and its torque and speed changes in a small range. In actual use, due to actual working conditions of motor vehicles in a constant process of change, the need for traction and rotation speed of the car must be to a large extent able to change, and cars often need to reverse driving, so in the automotive transmission lines must be set to auto transmission.Automotive Transmission performance testing process, in most cases need to frequently change the transmission gear to meet the needs of performance testing. At present most of the static test stand mode shift, so parking is not only a waste of time frequent consumption of energy and. Only by not stopping the process state completed a series of dynamic shift mode shift to effective test platform for performance. The test stands on the use of a dynamic shift pattern.The test stand is to meet the input power 500kW, input torque 3000N.m transmission performance of heavy vehicles designed for large-scale life test measurement and control system test rig is mainly used for controlling and measuring transmission speed, torque, power, temperature, etc. kinds of parameters. System used in the design process mature and reliable JC-type phase-type torque-speed sensor for measuring the original, with the Lanzhou Engineering Group 560KW AC variable motor and ABB, AC800 Series AC inverter drive and torque control as the driving force, and through a total of approach to load DC bus electrical power generated electricity back to the drive motor closed form, so to save energy.The test bed modular structure design, full use of test bed on the floor, electrical sensors, clamps and other resources, through a combination of different forms of evolution can be achieved in the same test bed for different types of test transmission of the performance test. Test with the installation quick, easy adjustment, high degree of automation features. Automatic test process can be intelligent control, and have manual control mode. Test bed simulation of dual frequency motor vehicle transmission of the actual conditions to realize the true test of the transmission performance. Drive motor control through ABB-ACS804 variable frequency control cabinet to achieve, AC variable frequency motor output power by the load motor ABB-ACS814 power control cabinet back to form a closed loop DC bus to save energy. Instrument system Test Bed was be completed on the working conditions (the speed, the torque) control. To ensure the smooth progress of test, test rig equipped with oil temperature control system, oil temperature control system can guarantee that in the testing process of the transmission oil temperature within the set of real-time control, to get the transmission in a variety of speed, twisted moment, the oil under the curve.Mechanical transmission through the existing common test specification preliminary study, based on our company produces transmission structure and, combined with specific requests made by OEMs and the introduction of new technology-related provisions drawn up by test transmission of the test specifications, as the Transmission bench test method.System adopts PLC programmable controller to control transmission, automatic transmission oil temperature control system of institutions and movements. The computer system is control the entire system of process, data acquisition, data storage, generate statements and draw curve print out report.Through the diligent work of partners, on behalf of our advanced level of integrated power transmission test stand has been closed design completed and debugged. The company's transmission of my series of performance tests achieves satisfactory results, which show that the transmission test rig design is feasible and reasonable.
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