Method for determining the heating characteristic of a glow plug
AssigneeBorgWarner BERU Systems GmbH
InventorMarkus Kernwein
Life of this patent
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Abstract
A method for determining a heating characteristic of a glow plug, wherein pulse-width-modulated voltage pulses are applied to the glow plug and an electric variable is measured repeatedly during a voltage pulse with the heating characteristic of the glow plug determined by evaluating the difference of successive measurement results of this variable.
Claims16
A method for determining the heating characteristic quotient of a glow plug, wherein pulse-width-modulated voltage pulses are applied to said glow plug, wherein an electric variable is measured repeatedly during a single voltage pulse and the heating characteristic quotient of the glow plug is determined by evaluating a calculation comprising a difference between the successive measurement results of this electric variable divided by a second variable, where the second variable is correlated with the energy input during the single voltage pulse.
A method for identifying a glow plug, comprising:
- applying a plurality of pulse-width-modulated pulses to the glow plug;
- measuring a plurality of first electrical variables near or at the beginning of each of the plurality of pulse-width-modulated pulses;
- measuring a plurality of second electrical variables near or at the end of each of the plurality of pulse-width-modulated pulses;
- calculating an average of the plurality of first electric variables;
- calculating an average of the plurality of second electric variables;
- and
- calculating a difference between the average of the plurality of first and second electric variables.
A method for identifying a glow plug, comprising:
- applying a pulse-width-modulated pulse to the glow plug;
- measuring a first resistance near or at a beginning of the pulse-width-modulated pulse;
- measuring a second resistance near or at an end of the pulse-width-modulated pulse;
- calculating a resistance difference between the first and second resistance;
- determining an energy correlated variable associated with the pulse-width-modulated pulse;
- and
- dividing the resistance difference by the energy correlated variable to arrive at a glow plug characteristic quotient.
Dependencies are inferred from the claim text.