Patent ID: 7256514
Filing Date: 2007-08-14
Classification: B60K,B60L,B60W,Y02T,Y10S

Abstract:
1. A device for open-loop or closed-loop control of an electrical system and a propulsion system of a motor vehicle, with the propulsion system having an internal combustion engine and a transmission with a variable step-up and/or step-down ratio, the electrical system having a vehicle power supply system and at least one battery connected to the vehicle power supply system, and at least one electrical machine being provided, wherein said electrical machine is operable during a normal charging mode as a generator for supplying current to the battery and to the vehicle power supply system from the propulsion system, and is drivable by the propulsion system as a generator in a recuperation mode to produce a braking torque and to supply the at least one battery and the vehicle power supply system with current and is operable as an electric motor for emitting torque to the propulsion system, wherein the device controls the at least one electrical machine in different operating states by different signals, in which case a charging voltage for the normal charging mode is produced automatically as a voltage reference variable for controlling the electrical machine from signals from a vehicle management as a function of the respective requirements for electrical power from the vehicle power supply system and from the battery at any given time; further wherein the device automatically provides the respective torque demand at any given time as a torque reference variable for controlling the electrical machine as a function of the respective requirements, at that time, for a positive or negative torque for the propulsion system, in which case changes in the voltage reference variable downwards and upwards are limited by predetermined torque limit values for the electrical machine which define a torque tolerance band, in which further case, changes in the torque reference variable upwards and downwards are limited by predetermined voltage limit values for the electrical machine, which form a voltage tolerance band, means for automatic cyclic checking of the reference variables, wherein the electric machine is controlled automatically by the voltage reference variable, but a change takes place to the torque reference variable for controlling the electrical machine, provided that the tolerance bands are complied with, when and for as long as the torque reference variable demands from the electrical machine a positive or negative torque which is not the same as the predetermined torque on the electrical machine in order to produce the charging voltage.