Method for monitoring the electrical properties of a load circuit controlled in a clocked manner and circuit system for performing the method

A circuit system for monitoring electrical properties of a load circuit controlled in a clocked manner, the load circuit including at least one switch and at least one inductive load, the circuit system comprising:

• a control unit to control the switch;
• and
• a measuring unit for acquiring and analyzing measured variables;
• wherein the circuit system is configured to perform a monitoring method, the monitoring method including the steps of:
• establishing at least one first control signal and one second control signal, the first control signal and the second control signal being established in such a way that, in a case of activation of the load circuit using the first control signal, an inductive behavior of the load circuit predominates, and, in a case of activation of the load circuit using the second control signal, an ohmic behavior of the load circuit predominates;
• acquiring at least one first measured variable and at least one second measured variable, which are a function of a control signal and at least one of the ohmic and inductive components, in the case of activation of the load circuit using the first control signal and in the case of activation of the load circuit using the second control signal, respectively;
• ascertaining deviations of the first and second measured variables from measured variables which are expected for a resistor load circuit and for an inductor load circuit, respectively, on a basis of nominal values of the ohmic and inductive ohmic components;
• and
• classifying a state of the load circuit based on the ascertained deviations.

A method for monitoring electrical properties of a load circuit controlled in a clocked manner, the load circuit having at least one ohmic component and at least one inductive component, the method comprising:

• establishing at least one first control signal and one second control signal, the control signals being established in such a way that, in the case of activation of the load circuit using the first control signal, an inductive behavior of the load circuit predominates, and, in the case of activation of the load circuit using the second control signal, an ohmic behavior of the load circuit predominates, at least one of the control signals including at least two control pulses;
• acquiring at least one measured variable, which is a function of the respective control signal and at least one of the ohmic and inductive components, in the case of activation of the load circuit using the first control signal and in the case of activation of the load circuit using the second control signal;
• ascertaining the deviations of the measured variables from measured variables which are expected on the basis of nominal values of the inductive and ohmic components;
• and
• classifying a state of the load circuit on the basis of the ascertained deviations.