Method and device for diagnosing phase current sensor defects in control system of synchronous rotary electric machine of motor vehicle

Patent metadata

Field	Value
Publication number	US-10718845-B2
Application number	US-201515512312-A
Country	US
Kind code	B2
Filing date	Sep 10, 2015
Priority date	Sep 17, 2014
Publication date	Jul 21, 2020
Grant date	Jul 21, 2020

Abstract

The method according to the invention enables the diagnosis ( 15, 16 ) of phase current sensor defects in a system for controlling a synchronous rotary electrical machine of a motor vehicle. According to the invention, the method takes into account the differences (îd, lq) between measurements provided ( 14 ) by the sensors, and nominal values of the phase currents (ia, ib, ic) in order to diagnose defects. The differences are calculated ( 18 ) in a rotating Park reference frame ( 17 ) and are separate from an electromechanical model of the machine. The method detects sensor defects if the differences are substantially non-zero ( 19 ) and an offset sensor defect if a residual pulsation (ω res) of the differences is substantially equal to a measured speed (w) of the control system.

First claim

The invention claimed is:

1. A method ( 15 , 16 ) for diagnosing defects of phase current sensors ( 10 ) in a control system ( 1 ) of a synchronous rotary electrical machine ( 2 ) of a motor vehicle, the method comprising the step of taking into account differences (I ˜ d , I ˜ q ) between measurements of phase currents of each of phases of the synchronous rotary electrical machine ( 2 ) provided ( 14 ) by the phase current sensors ( 10 ) and nominal values of phase currents (I a , I b , I c ) of each of the phases of the synchronous rotary electrical machine ( 2 ) in order to diagnose defects if differences (I ˜ d , I ˜ q ) are non-zero ( 19 ),
the differences (I ˜ d , I ˜ q ) being calculated ( 18 ) in a rotating Park reference frame ( 17 ) and being separate from an electromechanical model of the rotary electrical machine ( 2 ),
a faulty sensor among the phase current sensors ( 10 ) being identified by comparing a residual electrical angle θ res to a measured electrical angle θ of the control system ( 1 ), the residual electrical angle θ res defined by the equation:
θ res =arctan( Ĩ q ,Ĩ d )

where (I ˜ d , I ˜ q ) are the differences.

2. The method ( 15 , 16 ) according to claim 1 , wherein an offset error of at least one of the phase current sensors ( 10 ) is detected ( 21 , 22 ) if a residual pulsation (ω res ) of the differences (I ˜ d , I ˜ q ) is equal to a measured speed (ω) of the control system ( 1 ).

3. A diagnosing device ( 25 ) for diagnosing defects of phase current sensors ( 10 ) in a control system ( 1 ) of a synchronous rotary electrical machine ( 2 ) of a motor vehicle capable of implementing the method according to claim 2 , the diagnosing device ( 25 ) comprising:
an acquisition device configured to acquire measurements (I a , I b , I c ) provided by the phase current sensors ( 10 ) and an electrical angle (θ) of the control system ( 1 );
a processing device configured to digitally process the measurements (I a , I b , I c );
a generating device configured to generate flags indicating said defects of sensors ( 10 ); and
a treatment device configured to perform a Park transformation and comprising an analyzing device configured to analyze waveforms of the phase currents (I a , I b , I c ) in the rotating Park reference frame ( 17 ), the analyzing device including a calculating device configured to calculate a time-weighted moving average.

4. The method ( 15 , 16 ) according to claim 1 , wherein a gain error of at least one of the phase current sensors ( 10 ) is detected ( 21 , 22 ) if a residual pulsation of the differences (I ˜ d , I ˜ q ) is equal to twice a measured speed (ω) of the control system ( 1 ).

5. A diagnosing device ( 25 ) for diagnosing defects of phase current sensors ( 10 ) in a control system ( 1 ) of a synchronous rotary electrical machine ( 2 ) of a motor vehicle capable of implementing the method according to claim 4 , the diagnosing device ( 25 ) comprising:
an acquisition device configured to acquire measurements (I a , I b , I c ) provided by the phase current sensors ( 10 ) and an electrical angle (θ) of the control system ( 1 );
a processing device configured to digitally process the measurements (I a , I b , I c );
a generating device configured to generate flags indicating said defects of sensors ( 10 ); and
a treatment device configured to perform a Park transformation and comprising an analyzing device configured to analyze waveforms of the phase currents (I a , I b , I c ) in the rotating Park reference frame ( 17 ), the analyzing device including a calculating device configured to calculate a time-weighted moving average.

6. A diagnosing device ( 25 ) for diagnosing defects of phase current sensors ( 10 ) in a control system ( 1 ) of a synchronous rotary electrical machine ( 2 ) of a motor vehicle configured to implement the method according to claim 1 , the diagnosing device ( 25 ) comprising:
an acquisition device configured to acquire measurements (I a , I b , I c ) provided by the phase current sensors ( 10 ) and an electrical angle (θ) of the control system ( 1 );
a processing device configured to digitally process the measurements (I a , I b , I c );
a generating device configured to generate flags indicating said defects of sensors ( 10 ); and
a treatment device configured to perform a Park transformation and comprising an analyzing device configured to analyze waveforms of the phase currents (I a , I b , I c ) in the rotating Park reference frame ( 17 ), the analyzing device including a calculating device configured to calculate a time-weighted moving average.

7. The diagnosing device ( 25 ) according to claim 6 , wherein the acquisition device is further configured to acquire a speed (ω) of the control system ( 1 ), and wherein the treatment device further comprises a detecting device configured to detect an offset error and/or a gain error of at least one of the phase current sensors ( 10 ) as a function of the speed (ω).

8. The diagnosing device ( 25 ) according to claim 7 , wherein the treatment device further comprises an identification device configured to identify a faulty sensor among the phase current sensors ( 10 ) as a function of the electrical angle (θ).

9. The synchronous rotary electrical machine ( 2 ) comprising at least one integrated control system ( 1 ), the at least one integrated control system ( 1 ) including the diagnosing device ( 25 ) for diagnosing phase current sensor defects of the at least one integrated control system ( 1 ) according to claim 6 .

10. A semiconductor memory ( 26 ) integrated in the diagnosing device ( 25 ) according to claim 6 .

11. The synchronous rotary electrical machine ( 2 ) comprising at least one integrated control system ( 1 ), the at least one integrated control system ( 1 ) including the diagnosing device ( 25 ) according to claim 7 .

12. The synchronous rotary electrical machine ( 2 ) comprising at least one integrated control system ( 1 ), the at least one integrated control system ( 1 ) including the diagnosing device ( 25 ) according to claim 8 .

13. A semiconductor memory ( 26 ) integrated in the diagnosing device ( 25 ) according to claim 7 .

14. A semiconductor memory ( 26 ) integrated in the diagnosing device ( 25 ) according to claim 8 .

Assignees

• Valeo Equip Electr Moteur
• Valeo Equipments Electriques Moteur

Inventors

• Diao Sidath
• Makni Zaatar
• Diallo Demba

Classifications

• G01R31/42 Primary

  AC power supplies · CPC title

• G01R31/343

  in operation · CPC title

• H02P6/16

  Circuit arrangements for detecting position · CPC title

• H02P29/0241

  the fault being an overvoltage · CPC title

• G01R35/005 Primary

  Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references (G01R33/0035, G01R35/002 take precedence) · CPC title