JP2022021849A5

JP2022021849A5 -

Info

Publication number: JP2022021849A5
Application number: JP2020125701A
Authority: JP
Filing date: 2020-07-22
Publication date: 2022-10-31
Anticipated expiration: 2040-07-22

Claims

A driving device (10) for a rotating electric machine, which is applied to a rotating electric machine having a plurality of windings corresponding to a plurality of phases,
a first inverter (INV1) connected to a DC power supply and comprising an upper arm switch and a lower arm switch connected to one end of the winding for each phase;
a second inverter (INV2) comprising an upper arm switch and a lower arm switch connected to the other end of the winding for each phase;
a phase current sensor (DU, DV, DW) provided for each of a plurality of phase connection lines (LU1, LV1, LW1) connecting the first inverter and the second inverter for each phase;
a high potential connection line (La) connecting the DC high potential side of the first inverter and the DC high potential side of the second inverter;
a low potential connection line (Lb) connecting the DC low potential side of the first inverter and the DC low potential side of the second inverter;
a drive circuit (11) capable of H-driving the rotating electric machine;
a control unit (12) capable of controlling the operation of the first inverter and the second inverter by controlling the opening and closing of the upper arm switch and the lower arm switch;
The control unit executes failure diagnosis of the phase current sensor based on a total current that is a sum of phase currents calculated based on phase currents detected by the phase current sensors when the rotating electric machine is in H drive. Electric machine drive.

2. The failure diagnosis of the phase current sensor is executed based on a non-zero total current that is the sum of the phase currents calculated based on the phase currents detected by the phase current sensors during the H drive of the rotating electrical machine. 4. The driving device for the rotary electric machine according to .

2. The control unit determines that at least one of the phase current sensors has failed when a cumulative time during which the total current exceeds a predetermined current threshold exceeds a predetermined time threshold. Or 2 , a driving device for a rotary electric machine.

2. The controller determines that at least one of the phase current sensors has failed when frequency analysis is performed on the total current and a peak of a frequency component having an even order is equal to or greater than a predetermined value. A driving device for a rotary electric machine according to any one of 1 to 3 .

5. The rotating electrical machine according to claim 1 , wherein the rotating electrical machine is an open winding three-phase rotating electrical machine with a neutral point open, and the first inverter and the second inverter are three-phase inverters. A driving device for a rotating electric machine.

The drive circuit further includes, as a monitoring sensor, one current sensor capable of collectively detecting all currents flowing through the plurality of phase connection lines,
6. The phase current sensor according to any one of claims 1 to 5 , wherein the control unit executes failure diagnosis of the phase current sensor based on the current waveform of the phase current and the current waveform of the total current detected by the monitoring sensor. A driving device for a rotating electric machine.

The control unit
If both the total current and the total current are normal sinusoidal waveforms, it is determined to be normal,
7. The method according to claim 6 , wherein if both the total current and the total current are not normal sinusoidal waveforms, it is determined that a part of the drive circuit other than the phase current sensor and the monitoring sensor has failed. A driving device for a rotating electric machine.

8. Rotating according to claim 6 or 7, wherein if the sum current is not a normal sinusoidal waveform and the total current is a normal sinusoidal waveform, it is determined that at least one of the phase current sensors has failed. Electric machine drive.

The rotating electrical machine according to any one of claims 6 to 8, wherein when the total current has a normal sinusoidal waveform and the total current does not have a normal sinusoidal waveform, it is determined that the monitoring sensor has failed. drive.

When it is determined that at least one of the phase current sensors has failed, the control unit further energizes only one phase of each phase connection line, the current waveform of the total current and the current of all currents 10. The driving device for a rotary electric machine according to claim 6 , wherein the faulty phase current sensor is identified by comparing the waveforms.

The control unit selects a constant failure diagnosis mode in which failure diagnosis of the phase current sensor is always performed, and an emergency failure diagnosis mode in which failure diagnosis of the phase current sensor is performed only under a predetermined diagnosis condition. 11. The driving device for a rotary electric machine according to claim 6 , wherein switching is performed based on the driving state.

The rotating electric machine is mounted on a vehicle,
The control unit selects a constant failure diagnosis mode in which failure diagnosis of the phase current sensor is always performed, and an emergency failure diagnosis mode in which failure diagnosis of the phase current sensor is performed only under a predetermined diagnosis condition. 11. The driving device for a rotating electric machine according to claim 6, wherein switching is performed based on .

The drive circuit further comprises a connection line switch (SC) provided on at least one of the high potential connection line and the low potential connection line for connecting or disconnecting the first inverter and the second inverter, It is possible to switch between H drive and Y drive of the rotating electric machine,
The control unit
selecting one of the plurality of phase current sensors as an alternative monitoring sensor during Y drive of the rotating electric machine;
13. Any one of claims 1 to 12 , wherein fault diagnosis of the drive circuit is performed based on the sum of the phase currents of the phase current sensors other than the alternative monitoring sensor and the current detected by the alternative monitoring sensor. A driving device for a rotating electrical machine as described.