Method for determining impedances in a high-voltage network for a motor vehicle having an electrical energy store by means of an impedance analysis device and device for carrying out the method

摘要

The invention relates to an impedance analysis device (30), which has a dual function, for use with an electrical energy store (12) in a high-voltage network for a motor vehicle with measuring means (22) for determining a first voltage at the high-voltage network (10) and a first current in the high-voltage network (10) us to provide an associated first voltage value (UPM) and an associated first current value (IP, IM), and evaluation means (18) for the automated determination of an energy storage impedance of the electrical energy store connectable to the high-voltage network (10) ( 12) as a function of the first voltage value (UPM) and the first current value (IP). The evaluation means (18) are designed for the automated determination of an insulation impedance between the high-voltage network (10), which can be implemented as an IT network, and a conductor (20) of the motor vehicle. Furthermore, the invention relates to a method for determining impedances in a high-voltage network for a motor vehicle by means of an impedance analysis device (30) with the steps of determining a first voltage at the high-voltage network (10) and a first current in the high-voltage network (10) through the impedance analysis device ( 30) and providing an associated first voltage value (UPM) and an associated first current value (IP, IM), and automatically determining an energy storage impedance of an electrical energy store (12) which can be connected to the high-voltage network as a function of the first voltage value (UPM) and of the second Current value (IP) through the impedance analyzer (30). The method includes the further step of automatically determining an insulation impedance between the high-voltage network, which can be executed as an IT network, and a conductor (20) of the motor vehicle through the impedance analysis device (30).