Novel Approach to Diagnose Safe Electrical Power Distribution

Lars Braun (), Minh Le, Jürgen Motz and Kai Peter Birke
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Lars Braun: Robert Bosch GmbH, Mittlerer Pfad 9, 70499 Stuttgart, Germany
Minh Le: Robert Bosch GmbH, Mittlerer Pfad 9, 70499 Stuttgart, Germany
Jürgen Motz: Robert Bosch GmbH, Mittlerer Pfad 9, 70499 Stuttgart, Germany
Kai Peter Birke: Electrical Energy Storage Systems, Institute for Photovoltaics, University of Stuttgart, Pfaffenwaldring 47, 70569 Stuttgart, Germany

Energies, 2024, vol. 17, issue 22, 1-13

Abstract: The integrity of the 12 V dc power distribution system on a vehicle is essential to guarantee continuous power supply to safety-relevant consumers. Safety-relevant consumers are critical loads, for example, electric power steering, braking systems with functionalities like Anti-Lock Braking or Electronic Stability Control, and autonomous drive systems. To prevent insufficient power supply for safety-relevant consumers due to an increased wiring harness resistance, a novel diagnostic approach is developed to determine the condition of the power distribution, especially the electrical resistance. The influence of measurement errors and bus commutation on the estimation is investigated by using a simulation. By using the diagnostic, a resistance determination in the milliohm range with a standard deviation of σ = 0.3 m Ω can be achieved under realistic conditions. This ensures that failures in the wiring harness can be identified, avoiding cascading effects and minimizing recalls. Compared to the state of the art, redundancies, costs, and weight can be saved with the proposed diagnostic system based on electrical resistance estimation.

Keywords: automotive electronics; diagnostic; electric power steering; safe power distribution; powernet; power supply system; wiring harness (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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