Method for controlling the temperature of a glow plug

摘要

The invention relates to a method for controlling the temperature of a glow plug (1), wherein a setpoint temperature (Tset) is used to determine a setpoint value (Rset) of a temperature-dependent electric variable and an effective voltage (Ueff) which is generated by pulse width modulation is applied to the glow plug (1) and is used as correcting variable. According to the invention, it is provided that a mathematical model (4) is used to calculate an expected value (Re) of the electric variable, the electric variable is measured, a first error signal e1(t) is generated by evaluating the calculated value (Re), a value calculated from the effective voltage (Ueff) and the error signal (e1(t)) is used as the input variable of the mathematical model (4), wherein the mathematical model (4) uses the input variable to calculate an output variable (X) which defines the expected value (Re) of the electric variable, and wherein the output variable (X) of the mathematical model (4) is used to calculate a corrected value for the effective voltage (Ueff) and the effective voltage (Ueff) is changed to the corrected value.

主权项

1. A method for closed-loop controlling the temperature of a glow plug, wherein
a) a setpoint temperature is used to determine a setpoint value of a temperature-dependent electric variable, and b) an effective voltage which is generated by pulse width modulation is applied to the glow plug, wherein c) a mathematical model comprising a linear differential equation, which calculates an output variable from an input variable and provides the output variable at its output, is used to calculate an expected value of the temperature-dependent electric variable, d) a measured value of the temperature-dependent electric variable is measured, e) a first error signal is generated by comparing the calculated expected value of the temperature-dependent electric variable with the measured value of the temperature-dependent electric variable, f) value calculated from the effective voltage and the first error signal is used as a new input variable of the mathematical model, wherein the mathematical model calculates a new output variable from the new input variable, said new output variable defining a new expected value of the temperature-dependent electric variable, and g) the new output variable of the mathematical model and the setpoint value of the temperature dependent electric variable are used to calculate a corrected value for the effective voltage and the effective voltage is changed to the corrected value thereby controlling the temperature of the glow plug, h) wherein the closed-loop controlling method repeats itself starting at step d.