A study on the characteristics of signal transmission in the electronic brake system for autonomous driving

In electric vehicles for the autonomous driving, most driving systems require redundant designs to overcome significant functional problems. However, added design causes a problem of arranging parts in the vehicle and increase in the cost of the product. Therefore, the electronic brake system including a redundant design in the form of one box is being developed to solve the space and cost problem. This electronic brake system have mechanical parts that are shared by two separate electric systems, thereby minimizing the increase in the size of parts and the increase in the cost of parts. And for the communication between separated systems in one package, the metal structures are being used to connect two system. The signal integrity between the two systems that are connected by metal structure is very weak because of the discontinuous signal line. Also, there is a problem of signal distortion due to the coupling caused by high current system such as motor inverter circuit in the electronic brake system. In this paper, a design for improving the signal transmission performance between two systems is proposed through 3D EM simulation and verified through actual measurement.