Determining a temperature in an electric machine
AssigneeSchaeffler Technologies AG & Co. KG
InventorSebastian Supper
Life of this patent
Estimating the term…
Abstract
A temperature in an electric machine is determined based on temperature-dependent output values of a first temperature sensor and of a second temperature sensor. The first temperature sensor has a characteristic curve having a plurality of characteristic curve branches, wherein each characteristic curve branch is associated with a specific temperature range. The output value of the second temperature sensor is used to select a characteristic curve branch; the output value of the first temperature sensor is used to determine the temperature from the selected characteristic curve branch.
Claims20
A method for determining a temperature in an electric machine,
- the method comprising:
- determining a temperature-dependent output value of a first temperature sensor assigned to the electric machine, wherein the first temperature sensor has a characteristic curve with a plurality of characteristic curve branches, each characteristic curve branch being assigned to a respective temperature range of a plurality of temperature ranges, and each characteristic curve branch linking a value of a measured temperature to an output value of the first temperature sensor;
- determining a temperature-dependent output value of a second temperature sensor assigned to the electric machine;
- selecting one temperature range of the plurality of temperature ranges of the characteristic curve branches of the first temperature sensor, the one temperature range including the measured temperature corresponding to the output value of the second temperature sensor;
- and
- determining the temperature in the electric machine from the determined output value of the first temperature sensor and the characteristic curve branch assigned to the one temperature range.
A system comprising
- an electric machine;
- a first temperature sensor assigned to the electric machine;
- a second temperature sensor assigned to the electric machine;
- and
- an evaluation unit configured to:
- store a characteristic curve, associated with the first temperature sensor, the characteristic curve having a plurality of characteristic curve branches, each characteristic curve branch being assigned to a respective temperature range of a plurality of temperature ranges, and each characteristic curve branch linking a value of a measured temperature to an output value of the first temperature sensor,
- determine a temperature-dependent output value of the second temperature sensor,
- select one temperature range of the plurality of temperature ranges of the characteristic curve branches of the first temperature sensor, the one temperature range including the measured temperature corresponding to the output value of the second temperature sensor;
- and
- determine a temperature in the electric machine from the determined output value of the first temperature sensor and the characteristic curve branch assigned to the one temperature range.
A system comprising an evaluation unit including a processor and a memory, the memory storing instructions executable by the processor to:
- determine a temperature-dependent output value of a first temperature sensor;
- determine a temperature-dependent output value of a second temperature sensor;
- select one of a plurality of characteristic curve branches based on a measured temperature corresponding to the output value of the second temperature sensor, wherein each characteristic curve branch is associated with a respective temperature range and links a value of the measured temperature to the output value of the first temperature sensor;
- and
- determine a temperature from the determined output value of the first temperature sensor and the one characteristic curve branch.
Dependencies are inferred from the claim text.