点火系对环形线圈车辆检测器辐射干扰的仿真

环形线圈车辆检测器是利用电涡流检测原理工作的一种车辆检测设备,存在易受电磁干扰影响的缺陷.汽车点火系是环形线圈车辆检测器工作环境中存在的强大宽带电磁干扰源.针对汽车点火系对环形线圈车辆检测器可能产生的辐射干扰,采用基于有限积分技术的仿真软件进行了数值仿真.仿真结果表明,在不考虑汽车金属外壳屏蔽作用,并且点火系恰好位于环形线圈正上方的情况下,汽车点火系产生的辐射电场对环形线圈车辆检测器正常工作有严重影响,必须对其采取一定的屏蔽措施.

Simulation of Radiated Interference of Vehicle's Fire System to Inductive Loop Detectors

Inductive loop detector is an equipment using, electric vortex detecting principle to detect vehicles. However, the detector has the weakness of being liable to be influenced by electromagnetic interference.The fire system on vehicle is a powerful wide band electromagnetic interference source of the inductive loop detector. Finite integration technique has been applied in this paper to simulate the radiated interference of the fire system on vehicle to inductive loop detector.The result of simulation indicates that the radiated electric field coming from the fire system on vehicle has severe effect on the normal work of the inductive loop detector, without considering the shielding function of the metal shell of vehicle and the fire system just on the loop. Therefore some shielding measures should be taken for the fire system on vehicle.