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 in a region which is exposed to heat after the engine is turned off, the method comprising:
- measuring the temperature with 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, wherein the measured OAT values define a most recent value;
using the measured OAT sensor values to extrapolate a temperature-time function;
generating an adjusted OAT value using an observed time, the measured OAT sensor values, and the temperature-time function; and
applying a correction strategy when the vehicle is traveling at a speed at or above a threshold speed to determine the adjusted OAT value, wherein the step of applying a correction strategy further comprises;
updating the adjusted OAT value to the most recent value when the most recent value is less than the adjusted OAT value; and
setting the adjusted OAT value as a function of the most recent value and the adjusted OAT value when the most recent value is greater than or equal to the adjusted OAT value.
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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.
16 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 in a region which is exposed to heat after the engine is turned off, the method comprising:
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measuring the temperature with 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, wherein the measured OAT values define a most recent value; using the measured OAT sensor values to extrapolate a temperature-time function; generating an adjusted OAT value using an observed time, the measured OAT sensor values, and the temperature-time function; and applying a correction strategy when the vehicle is traveling at a speed at or above a threshold speed to determine the adjusted OAT value, wherein the step of applying a correction strategy further comprises; updating the adjusted OAT value to the most recent value when the most recent value is less than the adjusted OAT value; and setting the adjusted OAT value as a function of the most recent value and the adjusted OAT value when the most recent value is greater than or equal to the adjusted OAT value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. 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 with 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. - View Dependent Claims (10, 11, 12, 13)
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14. 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 with 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. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification