Motor current mapping

Patent metadata

Field	Value
Publication number	US-9634598-B2
Application number	US-201414782759-A
Country	US
Kind code	B2
Filing date	Apr 17, 2014
Priority date	Apr 24, 2013
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

An electric machine combined with an electronic control unit including a set of onboard maps of a same setpoint parameter on the basis of first and second operating variables of the machine, each of the maps being associated with a different level of a third operating parameter of the electric machine. The maps include ranges of authorized values, and at least one range of extrapolated values. The electronic control unit is configured, for values of the third parameter not associated with one of the onboard maps, to use interpolated values between two authorized values, or between one authorized value and one extrapolated value.

First claim

The invention claimed is:

1. An electric machine associated with an electronic control unit comprising:
a group of embedded maps with a same setpoint parameter according to a first operating parameter and a second operating parameter of the electric machine, each of the maps being recorded in a same variation domain of the first and second operating parameters, each of the maps being associated with a different level of a third operating parameter of the electric machine, the maps including ranges of values having at least two different types of status, or permitted value ranges, and at least one range of extrapolated values, for at least one of the maps,
wherein the electronic control unit is configured, when a value of a third operating parameter is associated with one of the embedded maps, for using as a setpoint value values belonging to the permitted value ranges excluding values belonging to the at least one range of extrapolated values,
wherein the electronic control unit is configured, for values of the third operating parameter not associated with one of the embedded maps, for using interpolated values between two permitted values, or between a permitted value and an extrapolated value,
wherein the same setpoint parameter is a current intensity value, and the same variation domain is represented between two torque values and between two values of rotation speed of the electric machine.

2. The method as claimed in claim 1 , wherein the first operating parameter and the second operating parameter are proportional to rotation speed and torque of the electric machine, and the third operating parameter is proportional to a battery voltage, the mapped setpoint parameter being used for calculating a current intensity setpoint of the stator or rotor of the electric machine.

3. The method as claimed in claim 2 , wherein, when using the specific subgroup of mapped values for an interpolation, the interpolation is performed between an upper voltage value of an unmodified portion of map, and a lower voltage value of a modified portion of map.

4. The method as claimed in claim 3 , wherein use of a value belonging to the specific subgroup of mapped values for an interpolation is permitted only if the voltage for which it is desired to determine a setpoint value is greater than or equal to a threshold voltage.

5. The method as claimed in claim 1 , used for calculating a rotor current intensity setpoint, a direct current intensity setpoint, and/or a quadrature current intensity setpoint in a synchronous electric machine.

6. A method of controlling an electric machine, with aid of a group of maps with a same setpoint parameter according to a first operating parameter and a second operating parameter defining an operating point of the electric machine,
each of the maps being recorded in a same variation domain of the first and second operating parameters, each of the maps being associated with a different level of a third operating parameter of the electric machine, in which use is forbidden of a specific subgroup of values mapped as setpoint values, but this specific subgroup is used for calculating setpoint values interpolated between a point of the specific subgroup and a second value of a neighboring map not belonging to one of the specific subgroups,
wherein the same setpoint parameter is a current value, and the same variation domain is represented between two torque values and between two values of rotation speed of the electric machine.

7. The method of control as claimed in claim 6 , wherein the embedded maps are defined by selecting a limited number of reference maps from among a broader set of available maps, of which some portions are completed or modified, so that by subsequently performing interpolations between a modified portion of a first embedded map and an unmodified portion of a second embedded map, at least one portion of one of the non-embedded available maps is retrieved.

8. The method as claimed in claim 7 , wherein at least one reference map is completed for obtaining a more complete embedded map, by extrapolating for each point to be completed, from values of another reference map and another non-embedded map which are respectively a closest reference map and non-embedded map, according to the third operating parameter, of the map to be completed, so that, the operating point to be completed is included in a permitted value range of the non-embedded map.

9. The method as claimed in claim 8 , wherein, in a domain of operating points which are not mapped in any of the available maps included between the embedded map to be completed and the closest embedded map, one or more virtual setpoint values equal to one or more setpoint values of the same map, corresponding to boundary points of the same variation domain, are assigned to the operating points of the same variation domain.

10. The method as claimed in claim 9 , wherein at least one zone of one of the embedded maps is completed by drawing a series of level lines of constant values from the boundary points of the at least one zone, the level lines being parallel to an axis corresponding to the first operating parameter or to an axis corresponding to the second operating parameter.

Assignees

• Renault Sas

Inventors

• Doc Caroline
• Baumann Thibaut

Classifications

• Y02T10/7275

  Cross-Sectional Technologies · mapped topic

• Y02T10/72

  Electric energy management in electromobility · CPC title

• B60L2240/421

  Speed · CPC title

• B60L2260/44

  by parameter estimation · CPC title

• H02P21/0003

  Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control · CPC title