MOTOR CURRENT MAPPING

• US 20160043678A1
• Filed: 04/17/2014
• Published: 02/11/2016
• Est. Priority Date: 04/24/2013
• Status: Active Grant

• Current Assignee: Ampere SAS
• Original Assignee: Renault Sas (Renault)
• Inventors: DOC, Caroline, BAUMANN, Thibaut
• Granted Patent: US 9,634,598 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 2220/14 Synchronous machines
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2260/44 by parameter estimation
• CPC Class Codes: H02K 11/02 for suppression of electromagnetic interference
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02P 21/0003 Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
• CPC Class Codes: H02P 21/02 specially adapted for optimising the efficiency at low load
• CPC Class Codes: H02P 21/22 Current control, e.g. using a current control loop
• CPC Class Codes: H02P 27/00 Arrangements or methods for the control of AC motors characterised by the kind of supply voltage of two or more motors H02P5/00; of synchronous motors with electronic commutators H02P6/00; of DC motors H02P7/00; of stepping motors H02P8/00
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

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.

Claims

1-10. -10. (canceled)

11. 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 variable and a second operating variable of the machine, each of the maps being recorded in a same variation domain of the two 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 parameter is associated with one of the embedded maps, for using as a setpoint value values belonging to the permitted ranges excluding values belonging to the extrapolated ranges, and the electronic control unit is configured, for values of the third 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.

17. The method as claimed in claim 11, wherein the first variable and the second variable are proportional to rotation speed and torque of the electric machine, and the third 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.

18. The method as claimed in claim 17, 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.

19. The method as claimed in claim 18, 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.

20. The method as claimed in claim 11, 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.

12. A method of controlling an electric machine, with aid of a group of maps with a same setpoint parameter according to a first operating variable and a second operating variable 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 variables, each of the maps being associated with a different level of a third operating parameter of the 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.

13. The method of control as claimed in claim 12, 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.

14. The method as claimed in claim 13, 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 parameter, of the map to be completed, so that, however, the operating point to be completed is included in a permitted value range of the non-embedded map.

15. The method as claimed in claim 14, 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 domain, are assigned to the operating points of the domain.

16. The method as claimed in claim 15, 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 zone, the level lines being parallel to an axis corresponding to the first variable or to an axis corresponding to the second variable.