Simulation Study On Automotive Electronic Control System Electromagnetic Interference Problem

For many years, it is a question receiving much concern in modern electronic control system to interfere with electromagnetically. Especially in the auto industry today, the vehicle adopts the car-mounted electronic module critical and non-critical, for example administrative system of the engine, anti-lock braking system, electrical power steering functions system and hot control system in function system, car. Meanwhile, because the electromagnetic environment that the vehicle is in is very complicated, often the working environment is very abominable in the electronic system of the car: Vibration and assaulting taking place frequently; A lot of noise sources such as wiper motor, fuel pump, spark light a fire intermittence that the coil, air conditioner starter, alternating current generator cable connect is cut off, and some wireless electronic apparatus, for instance mobile phone and BP,etc.. So the electronic element on the car must interfere with the source and radio frequency transmitter and coexist with these, these interfere with source and some transmitter install and set up appropriate for example meet an urgent need, serve vehicle, but some are not so for example some installed some launchers and cellular telephones of year of bike after being dispatched from the factory. In addition, the vehicle may also enter the strong electric magnetic field area where some outside transmitters emerge, the intensity can be up to dozens of even several hundred volt per metres. The auto industry had already realized these questions many years ago, all famous manufacturers had already taken certain measure, test the standard and legislate to require, try hard to reduce the electromagnetic influence that interferes with by this through making. Though with the deepening studying, the vehicle of today has possessed stronger ability of resisting to this kind of interference, but EMI influences the performance of the electronic control system in year of train very big, so must continue maintaining vigilance to it.Analyze the electron controls history, current situation and development trend at first, probe into the content of the control system in the electronic technology of the car thoroughly, direct against the complicated electromagnetic environment on the car subsequently, the ones that analyze on the car interfere with the source and interfere with the characteristic etc. mainly and electromagnetic. Further study prerequisite and foreshadowing for the electronic control system of the car. Take to car detailed to sew, shield body coupling respond, influence to car electronic electromagnetism of control system subsequently, discussion detailed simulation algorithm that sew in the FDTD and set up number value artificial model artificial research take according to basic principle of FDTD detailed to sew coupling characteristic to shield body. It is analyzed how much influence on shielding body coupling characteristic the detailed width size, number that sew are. Offer a reliable suggestion for the fact that the body of shielding used is designed in the electronic control system of the car.Direct it against the electronic control system of the car as the sensitive apparatus on the car finally, interference that receive its main a part interfere with from electronic apparatus to shield body through wire and outside whom apparatus go on join, producing among them, transmit and enter to shielding the interference that the internal apparatus causes while shielding the body through the wire in the external interference electromagnetic wave of this kind of situation. So this text study form wire conduct, interfere with, analyze, interfere with source and vertical distance interference that produce change, of line first, and the interference that the line length produces when being changed. Set up conducting the model of interfering with of a pair of wire according to the model of the single wire, analyze that interferes with the interference influence produced to a pair of wire respectively in source. In order to analyze the total interference that a stick of wire receives, put forward a and calculate the method to solve in the article, analyze that it is in the total interference of making a stick of wire produce among them to interfere with the source and a stick of wire.