Study The Influence Of Wiring On The EMC Of Automobile

With the development of electronic technology of the automobile, the use of electronic product increasing day by day has worsened the electromagnetic environment of the automobile, the electromagnetic and compatibly of automobile has already become the problem that must be considered in the automobile design. Adopt the numerical simulation and predict technology is to solve the electromagnetic compatible problem major method of the automobile at present. Transmission line theory in frequently domain and finite difference time domain method in time domain have been widely used at here. In view of automobile's EMC have great influence on automobile security and dependability, and the important position among the EMC problems of the automobile about wire, there is important practical meanings to research the EMC problem of automobile related to wire.On the foundation that the research current situation of relevant algorithms carries on detailed analysis, study the EMI problem of wire and make it expand to the study of EMC problem of automobile, promote the study to the computing technology of electric magnetic field, crosstalk and radiation of wire and EMC problem of automobile related to wire, these research can offer effective solution and tool to EMC analysis and design of automobile on system level, and promote the computer numerical simulation predict technology research and application of electric magnetic field computing technology, and facilitate improving security and dependability of automobile finally.In discuss the foundation of multi conductor transmission lines telegram equation, calculation of per unit length parameter of multi conductor transmission lines and solve of multi conductor transmission lines telegram equation, set up multi conductor transmission lines telegram equation of two parallel wires have common ground , obtain its coupling equivalent electrical circuit, respond according to coupling voltage curve analyze relationship that crosstalk voltage with frequency and wire interval and height from wire to ground. Set up four parallel multi conductor transmission lines telegram equation, calculate their coupling voltage response. Expound basic principle of FDTD, analyze detailed treatment method of thin wire and lumped element. Simulate the radiation problem of wire with different terminal, consider specifically that open terminal, resistance terminal, resistance and stub terminal, calculate result in frequently and time domain, analyze its reason. Discuss the feasibility of using MTL/FDTD hybrid method to solve the radiation problem of the wire above ground plane.To the real EMC problem of automobile, adopt the simulation software to build the model of setting up to carry on simulation. Mainly discuss the modeling question of the electromagnetic EMC of automobile, discuss the modeling methods about automobile body, electronic control module (ECU), wire and antenna. Simulate crosstalk of wire inside automobile, consider the hole and wire impact on EMC problem of automobile. Radiation simulation of wire inside automobile, consider automobile body influence on radiation of wire. Study the coupling among source and antenna when antenna in different position. The antenna in three different position specifically: The front of passenger's room, the automobile body top, above the trunk, confirm the best antenna setup position by calculating the coupling among source and antenna when antenna in three different position positions.