By Terence Rybak, Mark Steffka
Somebody who has operated, serviced, or designed an motor vehicle or truck within the previous couple of years has most definitely spotted that the age of electronics in our automobiles is right here! digital elements and platforms are used for every thing from the normal leisure process to the newest in “drive via wire”, to two-way communique and navigation. The fascinating truth is that the car has been established upon mechanical and fabrics engineering for far of its background with no some of the suggestions of electric and digital engineering. The emissions controls necessities of the 1970’s are commonly well-known because the time whilst electronics began to make their means into the former robotically established platforms and features. whereas this revolution was once happening, the electronics constructed concerns and ideas that have been addressed to permit interoperation of the platforms within the presence of one another and with the exterior setting. This incorporated the examine of electromagnetic compatibility, as structures and parts began to have impression upon one another simply as a result of their operation. EMC constructed through the years, and has develop into a really good zone of engineering acceptable to any quarter of platforms that integrated electronics. Many well-understood features of EMC were built, simply as many features of automobile structures were constructed. we're now at some degree the place the problems of EMC have gotten an increasing number of built-in into the automobile undefined.
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Extra resources for Automotive Electromagnetic Compatibility
TLFeBOOK 22 / Automotive EMC In summary, let's look at what we've learned in this chapter. The signal ground is not always the signal return path. EMC problems are frequently related to assuming that there is not a good “ground”. It is important to know the paths of the return currents, and that those paths depend upon the impedance of the circuit. 6.. Safety ground = zero current during normal operation Signal reference = near zero current during normal operation Signal or power return = current carrying connections Another problem with the use of the term “ground” is that it has the connotation of multiple electrical points that are at the same potential (0 volts) all the time.
Additional information on grounding schemes is found in references. It is important to remember that one type of ground scheme can be utilized for power signals, another for RF signals, and yet another for analog signals and cable shields. It is important to utilize the various concepts as needed to meet the requirements of safety, enhanced operability, and EMI control. 4 SINGLE POINT GROUND (SINGLE REFERENCE) The single reference ground scheme is a derivative of the star ground. Each isolated electrical system is referenced once to the ground plane.
5 TRANSMISSION LINES A transmission line is used to transfer energy from the antenna to a transmitter. 22. There are several types of transmission lines and we will discuss the most common ones here. They all have similar characteristics and functions; however, the construction can be very different and each type can have very different requirements. 24 show the two primary types of TLFeBOOK 50 / Automotive EMC transmission lines, "open wire line" and "coaxial line". There are important differences between these two types of transmission lines.