Outside ambient temperature initialization technique
AssigneeFord Global Technologies, LLC
InventorsChristos Kyrtsos, Kenneth Gerard Brown
Life of this patent
Estimating the term…
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.
Claims20
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.
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;
- 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.
A system for determining air temperature outside a passenger compartment of a motor vehicle, the system comprising:
- 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.
Dependencies are inferred from the claim text.