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Measuring vehicle energy and power distribution for components, systems, and certification (whitepaper)

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Understanding how vehicles use and distribute energy is crucial for electric vehicle development and certification. Electrical powertrain, including motors and inverters, heating, air conditioning, infotainment, and other sub systems all consume energy that is being supplied by the battery pack. Any energy usage or inefficiency can result in a shorter range of the vehicle. By mapping out the energy usage of all the subcomponents, automotive engineers can start to make decisions about vehicle control, and component selection to maximize the range of the vehicle. Vehicle manufacturers must make important decisions between weight, cost, range, and performance to make vehicles that have a desirable range for customers, and that meet the green energy requirements.

There are three main groups who are interested in vehicle energy consumption, certifying bodies, system engineers, and component engineers. Certifying bodies need accurate power measurements to give the electrical mile per gallon (MPGe) efficiency certification of a vehicle. This number allows consumers and governing bodies to make decisions. Vehicle and system level engineers need to understand how the different components and subsystems perform so they can optimize the range of a vehicle. This is not just for powertrain, but all the subsystems that are also consuming energy. Lastly component level engineers need to be able to look at where losses are occurring and how to minimize them.

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