A Statistical Analysis of Electrical Power Requirements in Vehicles

Ludwig Brabetz; Tobias Kerner; Mohamed Ayeb

doi:10.4271/2015-01-0243

The increasing power and safety requirements of electrical systems present a challenge for future automotive electrical networks. However, the modeling of use-profiles and the overall power consumption of electrical systems proves to be difficult as the number of potential on/off combinations of the loads is tremendous. Furthermore, the operation of some loads is correlated or depends upon the operating conditions. Thus, simple worst-case calculations applied to this complexity often lead to an over-specification of components.

The proposed approach is based on the probabilities of loads being in the on-state and their respective interdependencies with each other and with boundary conditions such as time of day. Applying basic statistics and a new iterative algorithm, it allows the calculation of the probability of consumed total power for a given set of boundary conditions and of, very importantly, its expected continuous period. Such information is a sound base for the identification of critical power situations, the layout of components, and for investigations of the power balance. The paper presents the theory, method, database, results, and a first application example, followed by a discussion of future potentials.

Standards

SAE Mobilus®

Publications

News

Events

Professional Development

A World in Motion (PreK-12)

Participate with SAE

SAE Membership

Donate

A Statistical Analysis of Electrical Power Requirements in Vehicles 2015-01-0243

SAE MOBILUS