Power distribution system in a vehicle

An apparatus for energy distribution in a motor vehicle having an internal combustion engine (14), said apparatus comprising a vehicle electrical power supply system (11) including a generator (13) regulated by a voltage regulator (21), at least one battery (12) and a plurality of consumers, said generator (13) being driven by said internal combustion engine (14), and a control arrangement (10) to which required information is fed from the vehicle electrical power supply system for determining control variables and regulating variables for corresponding components of at least one of the vehicle electrical power supply system and the internal combustion engine (14);

• wherein said control arrangement (10) comprises means for energy distribution management between the electrical power supply system and the internal combustion engine according to predetermined requirements so that a power supply set voltage (U_s) is kept within predetermined limits;
• and
• wherein said control arrangement (10) comprises said voltage regulator (21) and a vehicle power supply system managing means (20), said vehicle power supply system managing means (20) including means (24) for establishing an energy management strategy and pre-control means (23) for generating a differential output (P_diff) from at least a part of said required information, said differential output being input into said means (24) for establishing an energy management strategy and corresponding to a difference between actual power and required power with respect to a reference voltage, so that said means (24) for establishing an energy management strategy and said pre-control means cooperate with each other to determine at least one set value of the power supply set voltage (U_s) from said required information with the help of a predetermined energy distribution strategy, as well as means (22) for comparing said at least one set value of the power supply set voltage (U_s) with a measured voltage (U_ist) to provide a comparison result;
• and
• wherein the voltage regulator (21) includes means for generating a power adjusting parameter (P_stell) according to said comparison result and means for regulating said generator (13) according to said power adjusting parameter;
• and said voltage regulator and said pre-control means are formed as separate units.