Outside Ambient Temperature Initialization Technique
First Claim
1. A method of determining air temperature outside a passenger compartment of a motor vehicle, the motor vehicle having an engine and an outside air temperature (OAT) sensor disposed outside the passenger compartment, the OAT sensor located in a region which is exposed to heat after the engine is turned off, the method comprising:
- measuring the temperature at the OAT sensor over a series of spaced apart time intervals to define a plurality of measured OAT sensor values, at least one of which is after the engine is turned off;
using the measured OAT sensor values to extrapolate a temperature-time function; and
generating an adjusted OAT value using an observed time, the measured OAT sensor values, and the temperature-time function.
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Accused Products
Abstract
A method of determining air temperature outside a passenger compartment of a motor vehicle, the motor vehicle having an engine and an outside air temperature (OAT) sensor disposed outside the passenger compartment. The OAT sensor is located in a region which is exposed to heat after the engine is turned off. The method includes measuring a series of temperature values at the OAT sensor, using the measured OAT sensor values to develop a temperature-time function, and generating an adjusted OAT value using an observed time, the measured OAT sensor values, and the temperature-time function.
14 Citations
20 Claims
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1. A method of determining air temperature outside a passenger compartment of a motor vehicle, the motor vehicle having an engine and an outside air temperature (OAT) sensor disposed outside the passenger compartment, the OAT sensor located in a region which is exposed to heat after the engine is turned off, the method comprising:
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measuring the temperature at the OAT sensor over a series of spaced apart time intervals to define a plurality of measured OAT sensor values, at least one of which is after the engine is turned off; using the measured OAT sensor values to extrapolate a temperature-time function; and generating an adjusted OAT value using an observed time, the measured OAT sensor values, and the temperature-time function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of determining air temperature outside a passenger compartment of a motor vehicle, the motor vehicle having an engine and an outside air temperature (OAT) sensor disposed outside the passenger compartment, the OAT sensor in a region which is exposed to heat after the engine is turned off, the method comprising:
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measuring the temperature at the OAT sensor over a series of spaced apart time intervals to define a plurality of measured OAT sensor values, at least one of which is after the engine is turned off; using the measured OAT sensor values to extrapolate a temperature-time function; and generating an adjusted OAT value using an observed time, the measured OAT sensor values, and the temperature-time function, wherein the adjusted OAT value is generated upon starting the engine when the engine is turned off for a time period less than a predetermined maximum time interval.
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13. A system for determining air temperature outside a passenger compartment of a motor vehicle, the system comprising:
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an outside air temperature (OAT) sensor located outside a motor vehicle passenger compartment, the OAT sensor in a region which is exposed to heat after the engine is turned off; and a controller having a computer readable medium having instructions encoded thereon for; measuring the temperature at the OAT sensor over a series of spaced apart time intervals to define a plurality of measured OAT sensor values, at least one of which is after the engine is turned off; using the measured OAT sensor values to extrapolate a temperature-time function; and generating an adjusted OAT value using an observed time, the measured OAT sensor values, and the temperature-time function. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification