Method and device for controlling a powertrain

• US 9,463,712 B2
• Filed: 09/10/2012
• Issued: 10/11/2016
• Est. Priority Date: 09/12/2011
• Status: Active Grant

• Current Assignee: Renault Sas (Renault)
• Original Assignee: Renault Sas (Renault)
• Inventors: Merienne, Ludovic, Maloum, Abdelmalek
• Primary Examiner(s): To, Tuan C.
• Application Number:
  US14/344,481
• Publication Number:
  US 20140229051A1
• Time in Patent Office: 1,492 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: H02P 21/0003 Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
• CPC Class Codes: H02P 21/0021 using different modes of control depending on a parameter, e.g. the speed
• CPC Class Codes: H02P 21/0085 specially adapted for high speeds, e.g. above nominal speed
• CPC Class Codes: H02P 21/05 specially adapted for damping motor oscillations, e.g. for reducing hunting
• CPC Class Codes: H02P 2101/45 for motor vehicles, e.g. car alternators
• CPC Class Codes: H02P 2207/05 Synchronous machines, e.g. with permanent magnets or DC excitation
• CPC Class Codes: H02P 25/024 controlled by supply frequency
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

A method controlling a powertrain fitted in an automobile and including an electric motor including a rotor and stator, the method including: regulation of currents of the rotor and the stator via control signals from the electric motor, wherein the currents and control signals are expressed in a rotating coordinate system and include a plurality of axes, the control signals resulting from a first transformation including a change of variable that enables dynamic decoupling between the control signals, along each of the axes of the plurality of axes; saturation of the control signals resulting from the first transformation to satisfy constraints of a battery fitted in the automobile and connected to the electric motor; and blockage of at least some of the current reference values of the regulation if the control signals are saturated.

Claims

1. A method for controlling a power train installed in a motor vehicle and including an electric motor including a rotor and a stator, the method comprising:

regulation of rotor and stator currents via control signals for the electric motor, the currents and the control signals being expressed in a revolving reference frame and including a plurality of axes, the control signals being derived from a first transformation including a change of variable allowing for dynamic decoupling between the control signals along each of the axes of the plurality of axes;

saturation of the control signals obtained from the first transformation to satisfy constraints associated with a battery installed in the motor vehicle and connected to the electric motor, the saturation of the control signals including defining maximum and minimum limits for each of the control signals and clipping the control signals when the control signals are outside of the maximum and minimum limits to produce saturated control signals;

after the saturation of the control signals, blocking of at least some of regulation current setpoints; and

controlling the rotor and the stator of the electric motor based on the saturated control signals.

2. The method as claimed in claim 1, further comprising a second transformation including a change of variable that is reverse of the change of variable allowing for dynamic decoupling to express the control signals after the saturation in the revolving reference frame without a change of variable.

3. The method as claimed in claim 1, further comprising communication of information relating to the saturation of the control signals, and wherein the blocking of the regulation current setpoints is performed based on the information.

4. The method as claimed in claim 1, wherein the reference frame in which the currents and the control signals are expressed is a Park reference frame.

5. The method as claimed in claim 1, wherein the blocking includes, when one of the regulation current setpoints reaches a maximum limit, preventing the other regulation current setpoints from increasing further.

6. The method as claimed in claim 1, wherein the blocking includes, when one of the regulation current setpoints reaches a minimum limit, preventing the other regulation current setpoints from reducing further.