Intelligent tires are one key element for autonomous self-driving cars and the Internet of Vehicles (IoV), especially if the battery-driven sensor systems attain the transition to be self-powered. Harvesting vibrational energy of these tire pressure monitoring systems (TPMSs) is the promising technique to make tire sensors self-sufficient and to provide additional energy for sophisticated algorithms, which constitute the intelligence of vehicle tires. Despite of two decades of intense research, no commercial product has been established. This work analyzes the technological reasons and presents both challenges and opportunities of TPMS energy transducers. First, this article specifies significant system requirements and characterizes common energy sources. The authors determine the necessary amount of energy on two different paths. A throughout comparison between different TPMS transducers overviews the state of …