US 8,274,247 B2Granted

Rotary electric machine control system

AssigneeDenso Corporation

InventorsTakeshi Itoh, Takashi Ogawa

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Abstract

A control unit for a rotary electric machine control system includes a first current command module, a second current command module and a change module. The first current command module controls the rotary electric machine based on a maximum efficiency characteristic line. The second current command module controls the rotary electric machine based on an early switching characteristic line, which is set at a retard angle side relative to the maximum efficiency characteristic line with a predetermined phase difference. When a control mode is switched over to a rectangular wave voltage phase control mode from an overmodulation current control mode in accordance with an increase in torque, the change module changes the current command from the first current command module to the second command current module.

Claims16

Dependent claims

A rotary electric machine control system, which switches over a control mode of a rotary electric machine from a sinusoidal wave current control mode to an overmodulation current control mode and from the overmodulation current control mode to a rectangular voltage phase control mode, the rotary electric control system comprising:

first current command means for performing a first current command in the sinusoidal wave current control mode or the overmodulation current control mode by using a d-axis current and a q-axis current defined by a maximum efficiency characteristic line formed on a d-q plane defined by a d-axis and a q-axis, which are orthogonal to each other, by connecting each current pair of a d-axis current and a q-axis current, by which the rotary electric machine is driven at a maximum efficiency;
second current command means for performing a second current command in the overmodulation current control mode by using the pair of the d-axis current and the q-axis current defined by an early switching characteristic line different from the maximum efficiency characteristic line on the d-q plane until the control mode is switched to the rectangular wave voltage phase control mode, the early switching characteristic line being set at a q-axis side relative to the maximum efficiency characteristic line by connecting current pairs of a d-axis current and a q-axis current;
and
change means for changing a current command from the first current command to the second current command in a course of switching over the control mode from the sinusoidal wave current control mode to the rectangular wave voltage control mode through the overmodulation current control mode.

1 more element

A method of controlling a rotary electric machine, which has a control mode which is switchable from a sinusoidal wave current control mode to an overmodulation current control mode and from the overmodulation current control mode to a rectangular voltage phase control mode, the method comprising:

performing a first current command in the sinusoidal wave current control mode or the overmodulation current control mode by using a d-axis current and a q-axis current defined by a maximum efficiency characteristic line formed on a d-q plane defined by a d-axis and a q-axis, which are orthogonal to each other, by connecting each current pair of a d-axis current and a q-axis current, by which the rotary electric machine is driven at a maximum efficiency;
performing a second current command in the overmodulation current control mode by using the pair of the d-axis current and the q-axis current defined by an early switching characteristic line different from the maximum efficiency characteristic line on the d-q plane until the control mode is switched to the rectangular wave voltage phase control mode, the early switching characteristic line being set at a q-axis side relative to the maximum efficiency characteristic line by connecting current pairs of a d-axis current and a q-axis current;
and
changing a current command from the first current command to the second current command in a course of switching over the control mode from the sinusoidal wave current control mode to the rectangular wave voltage control mode through the overmodulation current control mode.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 12/566,107Filed 24 Sep 2009
Priority: JP 2008-24363324 Sep 2008
Published: US 2010/0072925 A125 Mar 2010
Granted: 25 Sep 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification27 codes

B60L 50/50
Electric propulsion with power supplied within the vehicle: using propulsion power supplied by batteries or fuel cells
B60K 6/365
Characterised by the transmission gearings: with the gears having orbital motion
B60K 6/445
Series-parallel type: differential gearing distribution type
B60L 15/025
Characterised by the form of the current used in the control circuit: using field orientation; Vector control; Direct Torque Control [DTC]