Method and device for detecting the exchange of sheathed-element glow plugs in a combustion engine
First Claim
1. A method for detecting an exchange of glow plugs (GPE) in a combustion engine, the method comprising:
- measuring at least one electric characteristic quantity of a glow plug at a beginning of a driving cycle;
determining an instantaneous value of the at least one electric characteristic quantity;
determining a time deviation of the at least one electric characteristic quantity by comparing the instantaneous value to at least one stored value of the same at least one electric characteristic quantity of the glow plug, the stored value having been determined at a start of at least one preceding driving cycle; and
if the time deviation of the instantaneous value from the stored value exceeds a specifiable threshold value, inferring an exchange of the glow plug.
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Accused Products
Abstract
A method and a device for detecting the exchange of sheathed-element glow plugs (GPE) in a combustion engine, in which at least one electric characteristic quantity of at least one glow plug is measured at the beginning of a driving cycle, an instantaneous value of this characteristic quantity is determined and compared to at least one stored value of the same electric variable quantity of this glow plug, which was determined at the beginning of at least one preceding driving cycle, and if the deviation of the instantaneous value from the stored value exceeds a specifiable threshold value, an exchange of the glow plug (GPE) will be inferred.
17 Citations
25 Claims
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1. A method for detecting an exchange of glow plugs (GPE) in a combustion engine, the method comprising:
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measuring at least one electric characteristic quantity of a glow plug at a beginning of a driving cycle; determining an instantaneous value of the at least one electric characteristic quantity; determining a time deviation of the at least one electric characteristic quantity by comparing the instantaneous value to at least one stored value of the same at least one electric characteristic quantity of the glow plug, the stored value having been determined at a start of at least one preceding driving cycle; and if the time deviation of the instantaneous value from the stored value exceeds a specifiable threshold value, inferring an exchange of the glow plug. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A device for detecting an exchange of sheathed-element glow plugs in a combustion engine, comprising:
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a measuring unit for measuring at least one electric characteristic quantity of a sheathed-element glow plug; a memory unit for storing at least one value of the at least one electric characteristic quantity; and a detection unit to determine an instantaneous value of the electric characteristic quantities of a glow plug, and to determine a time deviation of the at least one electric characteristic quantity by comparing the instantaneous value with at least one stored value of the same at least one electric characteristic quantity of the glow plug, the stored value having been determined at a start of at least one preceding driving cycle, and to detect a glow plug exchange (GPE) if the time deviation of the instantaneous value from the stored value exceeds a specifiable threshold value. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification