JP2015056971A5

JP2015056971A5 -

Info

Publication number: JP2015056971A5
Application number: JP2013189262A
Authority: JP
Filing date: 2013-09-12
Publication date: 2015-12-10
Anticipated expiration: 2033-09-12

Description

請求項１の発明に係る回転電機駆動システムは、車両の駆動力と制動力を発生させる回転電機と、複数のセルを有するバッテリと、複数のセルの状態を監視し、少なくとも各セルの開回路電圧および内部抵抗とを含むセル状態情報を出力するバッテリ監視装置と、バッテリと回転電機との間の電力授受における電力変換を行うインバータと、回転電機の電流を検出する電流センサと、インバータへの印加電圧を検出する電圧センサと、バッテリ監視装置から出力されたセル状態情報に基づいて回転電機のトルクを制御する回転電機制御部と、バッテリ監視装置から出力されたセル状態情報に基づいてバッテリの状態を推定するバッテリ状態推定部と、セル状態情報の異常を検出する異常状態検出部と、を備え、バッテリ監視装置は、複数のセルの開回路電圧の平均値に対する複数の各セルの開回路電圧の相関値を出力し、バッテリ状態推定部は、異常状態検出部により異常が検出された場合には、前記異常の検出以前に前記バッテリ監視装置から入力された相関値と、電流センサおよび電圧センサの出力とに基づいて、各セルの開回路電圧および内部抵抗を推定し、回転電機制御部は、異常状態検出部により異常が検出された場合には、バッテリ状態推定部で推定された各セルの開回路電圧および内部抵抗に基づいて回転電機のトルクを制御する。 According to a first aspect of the present invention, there is provided a rotating electrical machine drive system that monitors a state of a plurality of cells, a rotating electrical machine that generates a driving force and a braking force of a vehicle, a plurality of cells, and at least an open circuit of each cell. A battery monitoring device that outputs cell state information including voltage and internal resistance, an inverter that performs power conversion in power transfer between the battery and the rotating electrical machine, a current sensor that detects the current of the rotating electrical machine, A voltage sensor that detects an applied voltage; a rotating electrical machine control unit that controls torque of the rotating electrical machine based on cell state information output from the battery monitoring device; and a battery status based on cell state information output from the battery monitoring device. A battery state estimation unit for estimating a state; and an abnormal state detection unit for detecting an abnormality in the cell state information. The outputs correlation values of a plurality of open circuit voltages of each cell to the average value of the open circuit voltage, battery state estimating unit, when an abnormality is detected by the abnormal condition detecting unit, the the previously detected said abnormal Based on the correlation value input from the battery monitoring device and the output of the current sensor and voltage sensor, the open circuit voltage and internal resistance of each cell are estimated, and the rotating electrical machine control unit detects an abnormality by the abnormal state detection unit. If it is, the torque of the rotating electrical machine is controlled based on the open circuit voltage and internal resistance of each cell estimated by the battery state estimation unit.

Claims

A rotating electric machine that generates driving force and braking force of the vehicle;
A battery having a plurality of cells;
A battery monitoring device that monitors the state of the plurality of cells and outputs cell state information including at least an open circuit voltage and an internal resistance of each cell;
An inverter that performs power conversion in power transfer between the battery and the rotating electrical machine;
A current sensor for detecting a current of the rotating electrical machine;
A voltage sensor for detecting a voltage applied to the inverter;
A rotating electrical machine control unit that controls torque of the rotating electrical machine based on the cell state information output from the battery monitoring device;
A battery state estimation unit that estimates the state of the battery based on the cell state information output from the battery monitoring device;
An abnormal state detection unit for detecting an abnormality of the cell state information,
The battery monitoring device outputs a correlation value of the open circuit voltages of the plurality of cells with respect to an average value of the open circuit voltages of the plurality of cells,
The battery state estimation unit, when an abnormality is detected by the abnormal state detection unit, the correlation value input from the battery monitoring device before the detection of the abnormality , and the outputs of the current sensor and the voltage sensor Based on the above, the open circuit voltage and internal resistance of each cell are estimated,
When an abnormality is detected by the abnormal state detection unit, the rotating electric machine control unit calculates the torque of the rotating electric machine based on the open circuit voltage and internal resistance of each cell estimated by the battery state estimation unit. A rotating electric machine drive system for an electric vehicle to be controlled.

The rotating electrical machine drive system for an electric vehicle according to claim 1,
The battery state estimation unit
Among the plurality of cells, the correlation value relating to the deteriorated cell having the largest internal resistance or the smallest open circuit voltage is obtained from the battery monitoring device,
Based on the correlation value regarding the deteriorated cell acquired from the battery monitoring device before the detection of the abnormality , and the output of the current sensor and the voltage sensor, the open circuit voltage and internal resistance of the deteriorated cell are estimated,
The rotating electrical machine control unit is a rotating electrical machine drive system for an electric vehicle that controls torque of the rotating electrical machine based on an open circuit voltage and an internal resistance of the deteriorated cell estimated by the battery state estimation unit.

In the rotating electrical machine drive system of the electric vehicle according to claim 1 or 2,
The rotating electrical machine control unit calculates an allowable charge / discharge power range that the battery can accept based on the open circuit voltage and internal resistance estimated by the battery state estimation unit, and the charge / discharge power of the battery is the allowable charge / discharge power A rotating electrical machine drive system for an electric vehicle that controls torque of the rotating electrical machine so as to be within an electric power range.

The rotating electrical machine drive system for an electric vehicle according to any one of claims 1 to 3,
The rotating electrical machine drive system for an electric vehicle, wherein the correlation value is a deviation of an open circuit voltage of each of the plurality of cells from an average value of open circuit voltages of the plurality of cells.

The rotating electrical machine drive system for an electric vehicle according to any one of claims 1 to 3,
The rotating electrical machine drive system for an electric vehicle, wherein the correlation value is a voltage ratio of an open circuit voltage of each of the plurality of cells to an average value of open circuit voltages of the plurality of cells.

The rotating electrical machine drive system for an electric vehicle according to claim 2 ,
The abnormal state detection unit is a rotating electrical machine drive system for an electric vehicle that detects an abnormality of the battery monitoring device based on a change in a correlation value related to the deteriorated cell.

In the rotating electrical machine drive system for an electric vehicle according to any one of claims 1 to 5,
The abnormal state detection unit detects a communication abnormality between the battery monitoring device and the battery state estimation unit when the input of the cell state information from the battery monitoring device to the battery state estimation unit is interrupted. Detecting as a rotating electrical machine drive system for an electric vehicle.

The rotating electrical machine drive system for an electric vehicle according to any one of claims 1 to 7,
The battery state estimation unit and the abnormal state detection unit are provided in the rotating electrical machine control unit, and are a rotating electrical machine drive system for an electric vehicle.

In the rotating electrical machine drive system for an electric vehicle according to any one of claims 1 to 8,
The cycle of estimating the open circuit voltage and the internal resistance in the battery state estimation unit is set to be shorter than the transmission cycle in which the cell state information is output from the battery monitoring device.

A battery system used in the rotating electrical machine drive system for an electric vehicle according to claim 1,
The battery having a plurality of cells;
A battery system comprising: a battery monitoring device that monitors a state of the plurality of cells and outputs cell state information including at least a battery current, an open circuit voltage of each cell, an internal resistance, and the correlation value.

A rotating electrical machine control device used in the rotating electrical machine drive system for an electric vehicle according to claim 1,
A rotating electrical machine control device comprising the battery state estimation unit and the abnormal state detection unit.