Method for determining the ambient temperature of a mobile device
A method for determining the ambient temperature of a mobile device including: determining an operating condition of the mobile device for determining a thermal condition of the mobile device in a first task, estimating a dynamic parameter, which characterizes the thermal behavior of the mobile device in a second task, and calculating an ambient temperature of the mobile device with the aid of the dynamic parameter in a third task.
1. A method for determining the ambient temperature of a mobile device, the method comprising:
determining, via a processor, an operating condition of the mobile device for determining a thermal condition of the mobile device, wherein the operating condition is determined by analyzing at least one temperature value of one internal temperature sensor and a power consumption of the mobile device;
estimating, via the processor, a dynamic parameter which characterizes the thermal behavior of the mobile device; and
calculating, via the processor, an ambient temperature of the mobile device with the aid of the dynamic parameter;
wherein the at least one temperature value of the internal temperature sensor of the mobile device is measured for calculating the ambient temperature of the mobile device, and
wherein the ambient temperature is based on a first-order thermal network model, which is as follows:
T
amb
(
t
)
=
∂
T
G
1
(
t
)
∂
t
C
1
R
1
-
I
1
(
t
)
R
1
+
T
G
1
(
t
)
C
1
R
1
=
τ
(
t
)
(
2
)
where Tamb(t) is the calculated ambient temperature, TG 1 is the measured temperature of the internal temperature sensor, R 1 represents a thermal resistance, C 1 represents a thermal capacitance, and where the dynamic parameter corresponds to τ(t) as represented by the product of C 1 *R 1 as a function of time.
2. The method of claim 1 , wherein the ambient temperature is filtered after calculating the ambient temperature.
3. The method of claim 2 , wherein the method is repeatedly carried out.
4. The method of claim 1 , wherein at least one temperature value of at least one temperature sensor of the mobile device is measured for calculating the ambient temperature of the mobile device.
5. The method of claim 4 , wherein the method is repeatedly carried out.
6. The method of claim 1 , wherein the method is repeatedly carried out.
7. The method of claim 1 , wherein the operating condition includes at least one of self-heating during normal operation of the mobile device, charging a battery of the mobile device, or changes in an ambient temperature outside of the mobile device.
8. The method of claim 1 , wherein the dynamic parameter of τ(t) is estimated as a function of the operating condition, a dwell time in an instantaneous operating condition, a self-heating of the mobile device, and the at least one temperature value of the one internal temperature sensor.
9. The method of claim 1 , wherein an accuracy statement of the estimated ambient temperature is determined to indicate a confidence range for the estimated ambient temperature.