Electrical supply and starting system for a motor vehicle and method for operating the electrical supply and starting system

摘要

An electrical supply and starting system for a motor vehicle has a variable-voltage on-board electrical system that can be operated by two different DC voltages for supplying the motor vehicle, and having a motor/generator system that operates as a generator to deliver electrical energy to the on-board electrical system of the motor vehicle, and operates for starting an internal combustion engine of the motor vehicle.

主权项

1. An electrical supply and starting system for a motor vehicle, having:
a vehicle battery connected to an on-board electrical system and designed to supply a first DC voltage to the on-board electrical system of the motor vehicle; a motor/generator system connected to the on-board electrical system and designed to operate as a generator for delivering a second DC voltage to the on-board electrical system of the motor vehicle, and to operate as a starter motor operated by the second DC voltage for starting an internal combustion engine of the motor vehicle, the second DC voltage being higher than the first DC voltage; an electrical energy storage arrangement including a controllable, bidirectional DC/DC converter connected to the on-board electrical system of the motor vehicle in parallel with the vehicle battery and an electrical energy storage system connected between the controllable, bidirectional DC/DC converter and a ground of the motor vehicle, the electrical energy storage arrangement being designed to deliver the first and the second DC voltage to the on-board electrical system of the motor vehicle and to charge the electrical energy storage system with the first DC voltage delivered by the vehicle battery or with the second DC voltage delivered by the motor/generator system.