Electric vehicle control device

Patent metadata

Field	Value
Publication number	US-11396236-B2
Application number	US-201716956934-A
Country	US
Kind code	B2
Filing date	Dec 28, 2017
Priority date	Dec 28, 2017
Publication date	Jul 26, 2022
Grant date	Jul 26, 2022

Abstract

An electric vehicle control device includes a plurality of drive control systems that controls travelling of an electric vehicle. Each of the drive control systems includes an induction motor, an inverter that drives the induction motor, and a controller that controls the inverter. Each of the controllers of the plurality of drive control systems includes a miswiring detector that calculates a torque estimation value on a basis of motor currents and voltage command values and detects miswiring between the induction motor and the inverter on a basis of the calculated torque estimation value and the torque command value.

First claim

The invention claimed is:

1. An electric vehicle control device comprising a plurality of drive control systems to control travelling of an electric vehicle, each of the plurality of drive control systems including: an induction motor; an inverter to drive the induction motor; a current detector to detect motor currents flowing through the induction motor; a speed detector to detect a rotational speed of the induction motor; and a controller to control the inverter on a basis of a torque command value, the detected motor currents, and voltage command values calculated on a basis of the detected rotational speed, wherein
the controller includes
a miswiring detector to calculate a torque estimation value on a basis of the motor currents and the voltage command values and to detect miswiring between the induction motor and the inverter on a basis of the calculated torque estimation value and the torque command value.

2. The electric vehicle control device according to claim 1 , wherein
the miswiring detector includes:
an estimator to estimate the torque estimation value;
a calculation unit to calculate an absolute value of a deviation between the torque command value and the torque estimation value; and
a determination unit to compare the absolute value of the deviation with a reference value and to determine that the miswiring occurs and output a miswiring detection signal when the absolute value of the deviation is greater than the reference value.

3. An electric vehicle control device comprising a plurality of drive control systems to control travelling of an electric vehicle, each of the plurality of drive control systems including: an induction motor; an inverter to drive the induction motor; a current detector to detect motor currents flowing through the induction motor; and a controller to control the inverter on a basis of a torque command value, voltage command values calculated on a basis of the detected motor currents, and a speed estimation value calculated on a basis of the calculated voltage command values and the detected motor currents, wherein
the controller includes
a miswiring detector to convert a traveling speed of the electric vehicle into a rotational speed of the induction motor and to detect miswiring of the induction motor on a basis of the rotational speed and the speed estimation value.

4. The electric vehicle control device according to claim 3 , wherein
the miswiring detector includes:
a calculation unit to calculate an absolute value of a deviation between the rotational speed and the speed estimation value; and
a determination unit to compare the absolute value of the deviation with a reference value and to determine that the miswiring occurs and output a miswiring detection signal when the absolute value of the deviation is greater than the reference value.

5. An electric vehicle control device comprising a plurality of drive control systems to control travelling of an electric vehicle, each of the plurality of drive control systems including: an induction motor; an inverter to drive the induction motor; a first current detector to detect motor currents flowing through the induction motor; and a controller to control the inverter on a basis of a torque command value and voltage command values calculated on a basis of the detected motor currents, the electric vehicle control device further comprising
a second current detector to detect a total of currents flowing into input sides of the inverters of the plurality of drive control systems, wherein
the controller includes
a miswiring detector to calculate, using the torque command value, a total value of currents that flow into input sides of the inverters under proper conditions and to detect miswiring of the induction motor on a basis of the calculated total value of the currents and the torque command value.

6. The electric vehicle control device according to claim 5 , wherein
the miswiring detector includes:
a calculation unit to calculate the total value of the currents, using the torque command value;
a calculation unit to calculate an absolute value of a deviation between the total value of the currents and a value detected by the second current detector; and
a determination unit to compare the absolute value of the deviation with a reference value and to determine that the miswiring occurs and output a miswiring detection signal when the absolute value of the deviation is greater than the reference value.

Assignees

• Mitsubishi Electric Corp

Inventors

• Dairiki Satoru
• Sugahara Tetsuo
• Kato Sho

Classifications

• H02P21/50

  Vector control arrangements or methods not otherwise provided for in H02P21/00- H02P21/36 · CPC title

• B60W10/08

  including control of electric propulsion units, e.g. motors or generators · CPC title

• B60L3/003

  relating to inverters · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title

• B60L50/51 Primary

  characterised by AC-motors · CPC title