METHOD AND DEVICE FOR CHECKING FOR ERRORS IN ELECTRICAL LINES AND/OR ELECTRICAL CONSUMERS IN A VEHICLE

摘要

The invention relates to a method and a device for checking for errors in electrical lines and/or electrical consumers in a vehicle, especially defective connections. The method comprises the following steps: a frequency signal having a constant or variable frequency and a voltage level producing an essentially idle check are fed into an error-free model of an electrical installation to be checked, said installation being in the form of an electrical line and/or an electrical consumer. A reference measuring signal produced from the frequency signal is stored in a memory. The same frequency signal is fed into an electrical installation which corresponds to the error-free model and which is to be checked, and a measuring signal produced from the supplied frequency signal is picked up. The obtained measuring signal is compared with the reference measuring signal stored in the memory in terms of voltage amplitude, running time delay of the frequency, presence of spike pulses, ohmic line resistance and/or frequency-related changes of current. The result of said signal comparison is then indicated. Accordingly, the device comprises an element (5, 6) for producing a frequency signal having a constant or variable frequency and a voltage level producing an essentially idle check; an element (8) for storing a reference measuring signal detected by feeding the frequency signal into an error-free model of an electrical installation to be checked, said installation being in the form of an electrical line and/or an electrical consumer; an element for picking up a measuring signal produced from the supplied frequency signal; an element (9) for signal evaluation which compares the obtained measuring signal with the stored reference measuring signal in terms of voltage amplitude, running time delay of the frequency, presence of spike pulses, ohmic line resistance and/or frequency-related changes of current; and an element (12) which indicates the result of the signal comparison.