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US 7,607,827 B2Granted
Temperature detection device, temperature detection method, and computer-readable computer program product containing temperature detection program
AssigneeNissan Motor Co., Ltd.
InventorsTakaaki Karikomi, Ken Ito
Life of this patent
Estimating the term…
Abstract
Heating value P[W] generated at an IGBT is calculated, and a temperature difference ΔT′j [° C.] between a temperature Tw [° C.] of cooling water circulating in a cooling system and a temperature Tj [° C.] of an IGBT is calculated based on thermal resistance R [° C./W] of the cooling system. A temperature rise ΔTj [° C.] with transient influences eliminated is then calculated based on the calculated temperature difference ΔT′j [° C.], and the temperature Tj [° C.] (=Tw [° C.]+ΔTj [° C.]) of the IGBT is calculated.
Claims10
A temperature detection device comprising:
- a cooling medium temperature calculation device that is configured to calculate a temperature of a cooling medium in a cooling system in which a temperature detection subject driven at a prescribed driving ratio is cooled;
- a heat calculation device that is configured to calculate an amount of heat at the temperature detection subject based on drive information for the temperature detection subject;
- a temperature calculation device that is configured to calculate a temperature of the temperature detection subject based on the amount of heat calculated by the heat calculation device, a thermal resistance between the temperature detection subject and the cooling medium, and the temperature of the cooling medium calculated by the cooling medium temperature calculation device;
- a correction device that is configured to correct the amount of heat calculated by the heat calculation device using a temperature of the temperature detection subject calculated in a previous calculation period by the temperature calculation device;
- wherein the temperature calculation device is configured to calculate a temperature of the temperature detection subject based on the amount of heat corrected by the correction device, the thermal resistance, and the temperature of the cooling medium;
- a current detection device that is configured to detect a value of current flowing through the temperature detection subject;
- and
- a voltage detection device that is configured to detect a value of voltage applied to the temperature detection subject;
- wherein the current value detected by the current detection device, the voltage value detected by the voltage detection device, and drive ratio information for the temperature detection subject are configured to be contained in the drive information for the temperature detection subject.
6 more elements
A temperature detection device comprising:
- a cooling medium temperature calculation device that is configured to calculate a temperature of a cooling medium in a cooling system in which a temperature detection subject driven at a prescribed driving ratio is cooled;
- a heat calculation device that is configured to calculate an amount of heat at the temperature detection subject based on drive information for the temperature detection subject;
- a temperature calculation device that is configured to calculate a temperature of the temperature detection subject based on the amount of heat calculated by the heat calculation device, a thermal resistance between the temperature detection subject and the cooling medium, and the temperature of the cooling medium calculated by the cooling medium temperature calculation device;
- a correction device that is configured to correct the amount of heat calculated by the heat calculation device using a temperature of the temperature detection subject calculated in a previous calculation period by the temperature calculation device;
- wherein the temperature calculation device is configured to calculate a temperature of the temperature detection subject based on the amount of heat corrected by the correction device, the thermal resistance, and the temperature of the cooling medium;
- a voltage detection device that is configured to detect a value of voltage applied to the temperature detection subject, wherein:
- the voltage value detected by the voltage detection device and vector control information for the temperature detection subject are configured to be contained in the drive information of the temperature detection subject, with the vector control information for the temperature detection subject including current values for a d-axis and a q-axis and voltage values for a d-axis and a q-axis.
4 more elements
A temperature detection device comprising:
- a cooling medium temperature calculation means for calculating a temperature of a cooling medium in a cooling system in which a temperature detection subject driven at a prescribed driving ratio is cooled;
- a heat calculation means for calculating an amount of heat at the temperature detection subject based on drive information for the temperature detection subject;
- a temperature calculation means for calculating a temperature of the temperature detection subject based on the amount of heat calculated by the heat calculation means, the thermal resistance between the temperature detection subject and the cooling medium, and the temperature of the cooling medium calculated by the cooling medium temperature calculation means;
- a correction means for correcting the amount of heat calculated by the heat calculation means based on a temperature of the temperature detection subject calculated in a previous calculation period by the temperature calculation means;
- wherein the temperature calculation means is configured to calculate a temperature of the temperature detection subject based on the amount of heat corrected by the correction means, the thermal resistance, and the temperature of the cooling medium;
- a current detection means for detecting a value of current flowing through the temperature detection subject;
- and
- a voltage detection means for detecting a value of voltage applied to the temperature detection subject;
- wherein:
- the current value detected by the current detection means, the voltage value detected by the voltage detection means, and a drive ratio information for the temperature detection subject are configured to be contained in the drive information for the temperature detection subject.
7 more elements
Dependencies are inferred from the claim text.