DIAGNOSTIC DEVICE FOR TEMPERATURE SENSOR
First Claim
1. A diagnostic device for a temperature sensor provided in a power transfer device that transfers drive power generated by a drive power source in a vehicle, the diagnostic device for a temperature sensor comprising:
- a warm-up state determining unit to determine whether or not the drive power source is in a predetermined warm-up completion state; and
a low temperature offset malfunction determining unit to determine a low temperature offset malfunction in the temperature sensor when the warm-up state determining unit determines that the warm-up completion state is established, and the detected value from the temperature sensor is lower than a predetermined low temperature threshold.
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0 Petitions
Accused Products
Abstract
A diagnostic device for a temperature sensor is provided in a power transfer device that transfers drive power generated by a drive power source in a vehicle. The diagnostic device includes: a warm-up state determining unit to determine whether the drive power source is in a predetermined warm-up completion state; and a low temperature offset malfunction determining unit to determine a low temperature offset malfunction in the temperature sensor when the warm-up state determining unit determines that the warm-up completion state is established, and the detected value from the temperature sensor is lower than a predetermined low temperature threshold.
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Citations
16 Claims
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1. A diagnostic device for a temperature sensor provided in a power transfer device that transfers drive power generated by a drive power source in a vehicle, the diagnostic device for a temperature sensor comprising:
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a warm-up state determining unit to determine whether or not the drive power source is in a predetermined warm-up completion state; and a low temperature offset malfunction determining unit to determine a low temperature offset malfunction in the temperature sensor when the warm-up state determining unit determines that the warm-up completion state is established, and the detected value from the temperature sensor is lower than a predetermined low temperature threshold. - View Dependent Claims (2, 3, 4, 6, 7)
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5. A diagnostic device for a temperature sensor provided in a power transfer device that transfers drive power generated by a drive power source in a vehicle, the diagnostic device for a temperature sensor comprising:
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a high heat state determining unit to determine whether or not the drive power source is in a predetermined high heat state; and a high temperature offset malfunction determining unit to determine a high temperature offset malfunction in the temperature sensor when the high heat state determining unit determines that the high heat state is not established, and the detected value from the temperature sensor is higher than a predetermined high temperature threshold. - View Dependent Claims (8)
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9. A diagnostic device for a temperature sensor provided in a power transfer device that transfers drive power generated by a drive power source in a vehicle, the diagnostic device for a temperature sensor comprising:
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a low ambient temperature temperature-estimating unit to calculate an estimated temperature of a measured object under conditions of predetermined low temperatures; and a low temperature offset malfunction determining unit to determine a low temperature offset malfunction in the temperature sensor when the estimated temperature calculated by the low ambient temperature temperature-estimating unit is at or above a predetermined value, and the actual value of the measured object detected by the temperature sensor is at or below a previously set low temperature offset malfunction determination value. - View Dependent Claims (10, 11, 12, 14, 15)
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13. A diagnostic device for a temperature sensor provided in a power transfer device that transfers drive power generated by a drive power source in a vehicle, the diagnostic device for a temperature sensor comprising:
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a high ambient temperature temperature-estimating unit to calculate an estimated temperature of a measured object under conditions of predetermined high temperatures; and a high temperature offset malfunction determining unit to determine the high temperature offset malfunction in the temperature sensor when the actual value of the measured object detected by the temperature sensor is at least a predetermined value higher than the estimated temperature calculated by the high ambient temperature temperature-estimating unit. - View Dependent Claims (16)
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Specification