Electric drive unit and method for temperature calculation in an electrical drive unit
AssigneeSchaeffler Technologies AG & Co. KG
InventorsJochen Reith, Tom Huck, Jiufang Peng
Life of this patent
Estimating the term…
Abstract
A method calculates temperatures in an electric drive unit. A first temperature detection region has a first temperature and a second temperature detection region has a second temperature. The first temperature is influenced by a first coupling value which is non-linearly dependent on the first temperature and the temperature at the first and second temperature detection regions. The calculations are divided among separate calculation units such that the temperatures can be estimated in real time.
Claims15
A method for temperature calculation in an electric drive unit, the drive unit having a first temperature detection region with a first temperature and a second temperature detection region with a second temperature, wherein the first temperature is influenced by a first coupling value, which is non-linearly dependent upon the first temperature,
- wherein
- a first calculation module calculates a first temperature value of the first temperature detection region in a manner linearly dependent upon a first input value and calculates a second temperature value of the second temperature detection region in a manner linearly dependent upon a second input value,
- a second calculation module calculates the first coupling value at least according to the first temperature value and transmits said first coupling value to the first calculation module, and
- the first calculation module, according to the first and second input values and the first coupling value, calculates a first estimated temperature at the first temperature detection region and a second estimated temperature at the second temperature detection region.
A temperature estimation unit comprising:
- a first calculation unit programmed to estimate a plurality of temperatures based on a linear relationship to a plurality of input values and a first coupling value;
- and
- a second calculation unit programmed to calculate the first coupling value based on a non-linear function of at least one of the estimates of the plurality of temperatures.
Dependencies are inferred from the claim text.