On-Board PSS Monitoring – State calculation and fault diagnosis in on-board power supply systems


Ref.-No. 5020

The vehicle electrical system has become more and more complex over the years. Thus, the error probability increases, but an accurate fault identification and isolation becomes more and more difficult. In nowaday systems, there are already several sensors that measure current or voltage at specific points, but they are mainly for a self diagnosis purpose of individual control units.

The number of sensors would have to be significantly increased for enabling previously used methods to monitor the entire wiring system.But, there is another way to monitor the complete on board network. On-Board PSS Monitoring processes the measured data of the existing sensors in a central monitoring unit and calculates the overall state of the on-board network with a high accuracy. It can also identify faults by modeling the power network and making reasonable assumptions about possible errors and sources of errors. Faults in electrical branches, which are not directly accessible by sensors, can also be detected with On-Board PSS Monitoring. 

Keywords: Bordnetz, Kfz, Kraftfahrzeug, Monitoring, Netzspannung, Kurzschluss, Regelung, Fehler, elektrische Energieversorgung, On board grid, vehicle, car, monitoring, net voltage, short, control, error, electric power supply

Commercial application

With On-Board PSS Monitoring all relevant faults can be modeled, detected and isolated. In addition to classic fault models, e.g. (creeping) short circuits, line breakages, contact loss, aging / corrosion / contact deterioration or loose contacts, also complex fault events, e.g. arcs in 48 V vehicle networks, can be detected. On-Board PSS Monitoring can also be used in the planning process of a power network. By optimizing the distribution of measuring points, a complete monitoring of the on-board network can be achieved with a minimum number of sensors.


  • Full modelling of the on-board power supply System
  • Continuous simulation and control of the power supply system state
  • Detection of faults
  • Control of network branches without sensors also possible
  • Also applicable to hybrid power supplies
  • Useful aid for on-board power supply design

Current status                                                                                                         

A German patent application was filed, patent filings outside of Germany are still possible. The method was simulated and experimentally verified.

On behalf of the Dortmund University of Technology, we offer interested companies the possibility to obtain licensing and further development of the Technology.


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