Method of determining ambient air temperature
First Claim
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1. A method of determining air temperature outside a passenger compartment of a vehicle, the vehicle including first and second temperature sensors disposed outside the passenger compartment, the method comprising:
- measuring air temperature with the first temperature sensor to produce a first measured temperature value;
measuring air temperature with the second temperature sensor to produce a second measured temperature value;
applying a correction strategy to the first and second measured temperature values to determine first and second predicted temperature values, respectively; and
calculating a predicted ambient air temperature value based on the first and second predicted temperature values;
wherein the second predicted temperature value is set equal to the second measured temperature value when heating from a non-ambient heat source is not predicted.
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Abstract
A method of predicting ambient air temperature outside a passenger compartment of a vehicle. The method measures air temperature with a temperature sensor, applies a correction strategy, and determines a predicted temperature value.
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Citations
20 Claims
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1. A method of determining air temperature outside a passenger compartment of a vehicle, the vehicle including first and second temperature sensors disposed outside the passenger compartment, the method comprising:
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measuring air temperature with the first temperature sensor to produce a first measured temperature value; measuring air temperature with the second temperature sensor to produce a second measured temperature value; applying a correction strategy to the first and second measured temperature values to determine first and second predicted temperature values, respectively; and calculating a predicted ambient air temperature value based on the first and second predicted temperature values; wherein the second predicted temperature value is set equal to the second measured temperature value when heating from a non-ambient heat source is not predicted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of predicting ambient air temperature outside a passenger compartment of a vehicle, the vehicle including a temperature sensor, the method comprising:
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predicting whether heat from a non-ambient heat source is increasing air temperature proximate the temperature sensor; and calculating a predicted temperature value with a correction expression when non-ambient heating is likely and a speed of the vehicle is not greater than a threshold value, and when non-ambient heating is not likely and a measured temperature value not is stable. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method of determining ambient air temperature outside a vehicle, the vehicle including a temperature sensor adapted to detect air temperature, the method comprising:
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setting a predicted air temperature value equal to a measured temperature value provided by the temperature sensor when non-ambient heating is not likely, or when non-ambient heating is likely and either the measured temperature value is less than a previous measured temperature value and a speed of the vehicle is greater than a threshold speed value, or the measured temperature value is not less than a previous measured temperature value, the speed of the vehicle is not greater than the threshold speed value, and the measured temperature value is not increasing rapidly; setting the predicted air temperature value equal to the measured temperature value increased at a predetermined rate when non-ambient heat source is likely, the measured temperature value is not less than the previous measured temperature value, and the vehicle speed exceeds the threshold speed value; and calculating the predicted air temperature value using a correction expression when non-ambient heating is likely and either the measured temperature value is less than a previous measured temperature value, the speed of the vehicle is not greater than the threshold speed value, and the measured temperature value is not decreasing rapidly, or the measured temperature value is not less than the previous measured temperature value, the speed of the vehicle is not greater than the threshold speed value, and the measured temperature value is increasing rapidly.
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Specification