Abstract: A method for using a glow plug in a diesel engine includes, but is not limited to a first step of providing an electrical energy source for supplying an electrical current through the glow plug, a second step of measuring the electrical current, a third step of calculating a voltage across the glow plug using a measured value of the electrical current, and a fourth step of controlling the electrical current through the glow plug using the calculated voltage.

Abstract: A method is provided that includes, but is not limited to estimating the temperature (TGP,est) of the glow-plug (GP) in accordance with a first model of the glow-plug (GP) as a function of the detected values of the glow-plug voltage and current (VGP, IGP) and the sensed values of some input variables, such as the engine speed (?E) and the engine temperature (TE), determining, in accordance with a second predetermined model of the glow-plug (GP), a desired value of the voltage (VGP,des) or power (PGP,des) to be supplied to the glow-plug (GP), as a function of a desired value of the glow-plug temperature (TGP,des), the estimated glow-plug temperature (TGP,est), and the sensed values of the input variables, and varying the duty-cycle of a pulse-width-modulated voltage (VPWM) applied to the glow-plug (GP), as a function of the calculated value of said desired voltage (VGP,des) or power (PGP,des).

Abstract: A glow plug control unit is provided that comprises a first switch for connecting power supply lines to a glow plug. The glow plug control unit further comprises a voltage measurement unit for measuring the voltage at the power supply lines. A current measurement unit is built for measuring the current through the first switch and a control circuit is built for controlling the first switch and, in a current control mode, for regulating the current through the first switch.