Automation Design Improvement Of Automatic Transmission Test-bed

This thesis analyzed the construction principle of Automatic Transmission and studied the related test & diagnosis techniques, summing up the test method of Automatic Transmission (include what data need to be acquire, test flow process etc.), then made improvement of Automatic Transmission Test-bed Automation Design, both on soft and hardware. The thesis synthesized upperclassman's work of power equipment matching , discussed signal collect and meter, electric power, control circuit, engine operating condition simulation control, resistance operating condition simulation control, test application software etc.1. Motive and meaning of the researchIn our country automobile industry positive be placed in shape time, Automatic Transmission beginning equipped on a lot of motors, this situation inevitably press for to it's design, test, repair. Present domestic Automatic Transmission Test-bed mostly turning by hand, test accuracy is low, respond speed is slow; the import equipment's price is higher, concentrate in the minority enterprise and region, this condition can't satisfy the demand of automobile production and maintenance Enterprise. In order to develop the Automatic Transmission Test-bed which have independence intelligent property right, we propose this research lesson. The product must be technique forerunner, price reasonable, can supersede import product.2. Mechanical construction of the test bedAutomatic Transmission Test-bed is a machine, gathered mechanical, electricity and liquid. By way of satisfy variety automatic transmission maintenance test, basic test-bed construction design should in consideration of install of every kind of transmission, and power input, load burthen.3. The signal collects and meterThe main point of this paragraph is how to be more accuracy, more sensitiveness, more on time and more economies acquisition signal that need to becollected. In the text stated how to choose transducer and meter, communication between PC and distribution control system, interference of communication system and how to restrain interference.4. Test bed control systemControl system of the test bed is divided into 2 parts, PC control and bottom layer distribute control, bottom layer unit mainly include PLC% electromagnetism valve control system inverter, electricity eddy current control system. Subject to control real time, reliability, dependability and communication belt width, the thesis bring forward the scheme of distribute control system, PC responsible for send expected value to bottom layer control system. Then bottom layer control operate component with the rule in control module, greatly decreased the need of communication belt width between PC and sensor, intensify real time control.5. Power, resistance simulationPower simulation mainly according to engine characteristic curve, with inverter control motor, according to set operating condition cycle to generate corresponding torque, revolving speed.Resistance simulation control electricity eddy current system, make the revolving speed and braking moment relation accord with the condition of correspond speed and resistance relation.6. Test software and expert diagnosis systemThe software adopt reverse direction reason logically strategy, ratiocination the fault tree from top to down. First treat collected data, contrast it with expectation data, estimate fault phenomenon, then logically machine begin to work, search corresponding fault, until find failure reason and maintenance guide. Summary:Automatic Transmission test-bed can improve design quality . shorten development period intensify accuracy of maintenance, improve repair quality.