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US 11,274,647 B2Granted
Method for regulating the temperature of a glow plug
AssigneeBorgWarner Ludwigsburg GmbH
InventorJörg Stöckle
Life of this patent
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Abstract
Described is a method for regulating the temperature of a glow plug of an internal combustion engine, wherein a target resistance is determined from a target temperature by means of a resistance temperature characteristic of the glow plug and the actual resistance of the glow plug is regulated to the target resistance, the glow plug is heated to determine the resistance temperature characteristic of the glow plug, and thereby determining a resistance gradient and an electrical resistance of the glow plug is measured before the heating or at a defined time during the heating, using both the measured resistance and the resistance gradient, the resistance temperature characteristic is determined.
Claims15
A method for regulating a temperature of a glow plug of an internal combustion engine, comprising:
- (a) heating the glow plug and at the same time determining a resistance gradient;
- (b) measuring an electrical resistance of the glow plug before the heating or at a defined time during the heating to obtain a measured electrical resistance;
- (c) determining a first correction value and a second correction value;
- (d) determining a resistance temperature characteristic by modifying a given resistance temperature characteristic as a function of the first and second correction values, wherein the given resistance temperature characteristic is a reference temperature characteristic corresponding to an average glow plug of the same type as the glow plug being regulated;
- (e) determining a target resistance for a target temperature as a function of the resistance temperature characteristic;
- and
- (f) regulating an actual resistance of the glow plug to the target resistance;
- and
- wherein the first correction value is a function of both the measured electrical resistance and a corresponding resistance determined from the given resistance temperature characteristic;
- and
- wherein the second correction value is a function of both the resistance gradient determined with the heating of the glow plug and a resistance gradient of the given resistance temperature characteristic.
8 more elements
A method for regulating a temperature of a glow plug of an internal combustion engine, comprising:
- (a) heating the glow plug and at the same time determining a resistance gradient;
- (b) measuring an electrical resistance of the glow plug before the heating or at a defined time during the heating to obtain a measured electrical resistance;
- and
- (c) determining a resistance temperature characteristic by modifying a given resistance characteristic as a function of both the measured electrical resistance and the resistance gradient, wherein the given resistance temperature characteristic is a reference temperature characteristic corresponding to an average glow plug of the same type as the glow plug being regulated;
- (d) determining a target resistance for a target temperature as a function of the resistance temperature characteristic;
- and
- (e) regulating an actual resistance of the glow plug to the target resistance;
- wherein for determining the resistance temperature characteristic, a reference heating behavior of a reference glow plug is used to define a first reference resistance at a time in the reference heating behavior corresponding to a time of the measured electrical resistance relative to a beginning of the heating and the measured electrical resistance is compared with the reference resistance of the reference glow plug, and a first correction value is determined from the difference of the first reference resistance and the measured electrical resistance;
- the resistance gradient determined with the heating of the glow plug is compared with a reference resistance gradient of the reference glow plug, wherein the reference resistance gradient is defined by a time period in the reference heating behavior corresponding to a time period used to determine the resistance gradient relative to the beginning of the heating, and a second correction value is determined from a deviation of the resistance gradient determined with the heating of the glow plug from the reference resistance gradient;
- and
- the resistance temperature characteristic of the glow plug determined in step (c) is a function of the given resistance temperature characteristic, the first correction value and the second correction value.
8 more elements
A method for regulating a temperature of a glow plug of an internal combustion engine, comprising:
- (a) heating the glow plug and at the same time determining a resistance gradient;
- (b) measuring an electrical resistance of the glow plug before the heating or at a defined time during the heating to obtain a measured electrical resistance;
- and
- (c) determining a resistance temperature characteristic by modifying a given resistance temperature characteristic as a function of both the measured electrical resistance and the resistance gradient, wherein the given resistance temperature characteristic is a reference temperature characteristic corresponding to an average glow plug of the same type as the glow plug being regulated and determining the resistance temperature characteristic includes the steps of:
- (i) comparing the measured electrical resistance with a corresponding resistance which is determined from the given resistance temperature characteristic, and a first correction value is determined from the difference of the measured electrical resistance and the corresponding resistance determined from the given resistance temperature characteristic;
- (ii) comparing the resistance gradient determined with the heating of the glow plug with a resistance gradient of the given resistance temperature characteristic or the resistance temperature characteristic after being modified using the first correction value, and determining a second correction value from a deviation of the resistance gradient determined with the heating of the glow plug from the resistance gradient of the given resistance temperature characteristic or the resistance temperature characteristic after being modified using the first correction value;
- and
- (iii) determining the resistance temperature characteristic of the glow plug as a function of the given resistance temperature characteristic, the first correction value and the second correction value;
- (d) determining a target resistance for a target temperature as a function of the resistance temperature characteristic;
- and
- (e) regulating an actual resistance of the glow plug to the target resistance.
8 more elements
Dependencies are inferred from the claim text.