Article: Introduction to Measuring Electric Power During Transients

Transient testing is very important in the engineering of vehicles and can provide results superior to steady-state power measurements. However, its measurement has many challenges. This article will discuss transient testing, its importance, and the challenges it involves, as well as outlining the HBK value for transient power testing and its systems.

Drive Cycle Tests – Understanding the Energy Use of a Vehicle

One of the current big topics in electric vehicles is range and how far they can go on a given battery charge. In order to determine how far a vehicle can go, the EPA and governing bodies around the world have determined drive cycles. These are determined considering how an average driver might act in different circumstances. The diagram below shows a variety of different drive cycle examples.

Essentially, a drive cycle is a speed profile against time with given torques to provide acceleration rates. What is found is that the losses while accelerating or decelerating are different from measuring each of these points at a steady state. In order to find out how far a vehicle can go, power during a transient needs to be measured accurately.

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