METHOD FOR CONTROLLING A HEATING DEVICE FOR HEATING A COMPONENT, CONTROL DEVICE AND MOTOR VEHICLE WITH SAME

摘要

The invention relates to a method and a control device for controlling a heating device (26) for heating a component (24), in particular a lambda sensor. The method comprises the cyclically repeating steps:
operating the heating device (26) at a heating voltage,ascertaining a current heating voltage (U_H_a) of the heating device (26),ascertaining a mean heating voltage (U_H_m) for a predetermined, immediately preceding period of time,determining a maximum permissible heating period (T_max) for which the component (24) may be heated for the maximum length of time using the current heating voltage (U_H_a) or using the mean heating voltage (U_H_m), in dependence upon the mean heating voltage (U_H_m),comparing the current heating voltage (U_H_a) and the mean heating voltage (U_H_m) with a predetermined minimum heating voltage (U_H_min), andreducing the heating voltage of the heating device (26) if the current heating voltage (U_H_a) and/or the mean heating voltage (U_H_m) exceeds the predetermined minimum heating voltage (U_H_min) for the duration of the maximum permissible heating period (T_max).

主权项

1. A method for controlling a heating device for heating a component, comprising cyclically repeating steps:
operating the heating device at a heating voltage, ascertaining a current heating voltage of the heating device, ascertaining a mean heating voltage for a predetermined, immediately preceding period of time, determining a maximum permissible heating period for which the component may be heated for the maximum length of time using the current heating voltage or using the mean heating voltage, in dependence upon the mean heating voltage, comparing the current heating voltage and the mean heating voltage with a predetermined minimum heating voltage, and reducing the heating voltage of the heating device if at least one of the current heating voltage and the mean heating voltage exceeds the predetermined minimum heating voltage for the duration of the maximum permissible heating period.