Patent ID: 9329604
Filing Date: 2016-05-03
CPC Classification: F02P,G05D

Claim Text:
1. A method for closed-loop control of the surface temperature of a glow plug, which is heated by a pulse-width modulation method, to a target value of the surface temperature, comprising: measuring a heating current flowing through a heating resistor of the glow plug and a voltage applied to the glow plug; and using a calculation rule which assigns a value of the surface temperature to a value pair formed of a value of the heating current and a value of the voltage, wherein the calculation rule contains a correction term, which takes into account the influence of a changing temperature of a current conducting component of the glow plug, contained in the glow plug and connected to the heating resistor, on the relationship between the heating current measured at a given voltage and the surface temperature of the glow plug.