KR20090055321A - A demagnetizing detection apparatus of permanent magnet motor for hybrid electric vehicles and its method - Google Patents

Abstract

A demagnetizing detection apparatus of a permanent magnet motor for a hybrid electric vehicles and its method are provided to increase the power intensity of an auxiliary driving device by sensing demagnetization without an additional a voltage sensor and a voltage meter. A D-Q axis current command value calculation unit(41) calculates a D-Q axis current command value on a synchronous frame based on the torque command, the speed of an electric motor, and the voltage of the high voltage battery. A Q-axis voltage model(42) extracts Q axis voltage estimation value by using the D-Q axis current command value, and a voltage output unit(43) outputs Q axis reference value of the voltage by using the difference of Q axis current measurement and Q axis current command value. A demagnetization judgment part(44) determines the demagnetization of the permanent magnet of the electric motor by using the difference of Q-axis reference value of voltage and Q-axis voltage estimation value.

Description

Permanent magnet electric motor potato detection device and method of hybrid electric vehicle {A DEMAGNETIZING DETECTION APPARATUS OF PERMANENT MAGNET MOTOR FOR HYBRID ELECTRIC VEHICLES AND ITS METHOD}

The present invention relates to an apparatus and method for detecting a permanent magnet electric motor potato of a hybrid electric vehicle. Specifically, the potato of the permanent magnet in a permanent magnet electric motor used in a hybrid electric vehicle can be detected using a counter electromotive force estimation technique. The present invention relates to a permanent magnet electric motor potato detection device and method of a hybrid electric vehicle.

Permanent magnet electric motors can be used in electric vehicles, hybrid electric vehicles, fuel cell vehicles, etc. In addition, it is applicable to the entire industry that can use a permanent magnet electric motor.

Permanent magnet type electric motor generates driving force by using permanent magnet. The strength of magnetization of permanent magnet can be changed permanently according to its operating environment, especially the magnitude of applied field weakening current and the operating temperature of electric motor. In this case, the electric motor cannot generate the desired driving force, which causes the acceleration and fuel saving effect of the electric vehicle to be drastically reduced. Therefore, if the magnetic strength of the permanent magnet is often detected and the potato is reduced in strength, the user should be able to detect it, for example, US Patent No. 6720792 (Detection of demagnetization in a motor in an electric or partially electric motor vehicle). In this case, a separate voltage sensor and voltage meter are configured in the drive auxiliary system.

1 is a block diagram of a driving assistance system of an electric vehicle according to the related art.

An electric motor 138 for driving and an inverter 106 for controlling the electric motor, a generator 130 for charging the battery, an inverter 108 for controlling the generator, and control means 100 for controlling the inverters 106 and 108. It is composed of In order to monitor the potato state of the permanent magnets configured in each electric motor and the generator, a voltage sensor 114 for measuring the induced voltage of the permanent magnets of the electric motor and the generator, and a voltage meter 116 for transmitting it to the control means 100 have.

Potato detection method is as follows.

In an electric vehicle or a hybrid electric vehicle at a predetermined speed and no load state, the voltage monitor 102 uses the generator 130 and the electric motor to detect the permanent magnet induced voltage in the electric motor 138 and the generator 130. 138) directly. The control means 100 compares the permanent magnet induced voltage of the voltage sensor 114 detected by the voltage meter 116 with an expected reference voltage representing the permanent magnet induced voltage expected at a predetermined speed and in the fully magnetized state. Through this comparison, if the difference is smaller than the predetermined value, it is determined that the magnetization state of the permanent magnet in the propulsion motor and the electric generator is demagnetized.

However, the potato detection method according to the prior art has a problem in that a separate voltage sensor 114 and a voltage meter 116 are additionally required to measure the potato of the permanent magnet type electric motor.

In addition, since the volume of the driving assistance system increases due to the added voltage sensor 114 and the voltage meter 116, there is a problem that the power density decreases.

In addition, there is a problem that the reliability of the driving auxiliary system is lowered due to the failure and malfunction of the added voltage sensor 114 and the voltage meter 116.

The present invention devised to solve such a problem is to provide a potato detection method of a permanent magnet electric motor of a hybrid electric vehicle that can measure the potato of a permanent magnet electric motor through a control variable without a separate sensor. have.

Permanent magnet electric motor potato detection device according to the first invention of the present application, in a hybrid electric vehicle using a permanent magnet electric motor, the torque command value, the speed of the electric motor, the voltage of the high-voltage battery receives the DQ axis on the synchronous coordinate system A DQ axis current command value calculation unit for calculating a current command value; A Q-axis voltage estimation calculator for extracting a Q-axis voltage estimate using the D-Q-axis current command value; A Q-axis voltage reference value output unit configured to output a Q-axis voltage reference value by using a difference between the Q-axis current command value and the measured Q-axis current measurement value; And a potato state determination unit determining a potato state of the permanent magnet of the electric motor by using a difference between the Q axis voltage estimate value and the Q axis voltage reference value.

Preferably, the Q-axis voltage estimation calculator, the instantaneous input of the winding resistance, the D-axis inductance, the linkage flux of the permanent magnet of the electric motor and the rotational speed of the electric motor can be received.

Preferably, the Q-axis voltage estimate calculation unit, the current magnitude phase calculation unit for calculating the magnitude and phase of the current current by using the D-Q axis current command value; And a Q-axis voltage table for outputting the Q-axis voltage estimate by corresponding the magnitude and phase of the current to the stored Q-axis voltage table.

Permanent magnet electric motor potato detection device according to the second invention of the present application, in a hybrid electric vehicle using a permanent magnet electric motor, the torque command value, the speed of the electric motor, the voltage of the high-voltage battery receives the DQ axis on the synchronous coordinate system A DQ axis current command value calculation unit for calculating a current command value; An inverter output voltage command value output unit configured to output an inverter output voltage command value by using a difference between the D-Q axis current command value and the measured current measurement value; A flux estimate integrator for integrating the inverter output voltage command value from an input time of an engine start signal to a predetermined elapsed time and outputting a flux estimate; And a potato state judging unit for determining a potato state of a permanent magnet of the electric motor by using a magnetic flux reference value and the magnetic flux estimation value applied from the outside.

The permanent magnet electric motor potato detection device according to the third invention of the present application is a hybrid electric vehicle using a permanent magnet electric motor, in a hybrid electric vehicle, there is no operation of an accelerator pedal and a brake pedal, and the electric motor is detected. A current command value setting unit that outputs a DQ axis current command value as 0 when the speed is less than or equal to a predetermined range; A current controller for outputting a counter electromotive force estimate using the speed of the electric motor, the voltage of the high voltage battery unit, the current command value, and the detected current measurement value; A temperature constant conversion table for outputting a counter electromotive force constant corresponding to the detected temperature of the electric motor; A counter electromotive force calculator configured to output a counter electromotive force reference value using the counter electromotive force constant and the detection speed of the electric motor; And a potato state determination unit determining a potato state of the permanent magnet of the electric motor by using a difference between the back EMF estimate and the back EMF reference value.

Permanent magnet electric motor potato detection method according to the fourth invention of the present invention, in detecting the potato of the permanent magnet electric motor of a hybrid electric vehicle, the torque command value, the speed of the electric motor, the voltage of the high-voltage battery receives the synchronous coordinate system Calculating a DQ axis current command value on the phase; Extracting a Q-axis voltage estimate using the D-Q-axis current command value; Outputting a Q-axis voltage reference value by using a difference between the Q-axis current command value and the measured Q-axis current measurement value; And a fourth step of determining the potato state of the permanent magnet of the electric motor by using the difference between the Q-axis voltage estimate and the Q-axis voltage reference value.

Preferably, the second step, the instantaneous input of the winding resistance measured in the electric motor, the D-axis inductance, the linkage flux of the permanent magnet of the electric motor and the rotational speed of the electric motor are instantaneously received to estimate the Q-axis voltage Can be extracted.

Advantageously, the second step comprises: calculating magnitude and phase of a current current using the D-Q axis current command value; And outputting the Q-axis voltage estimate by corresponding the magnitude and phase of the current to a stored Q-axis voltage table.

Permanent magnet electric motor potato detection method according to the fifth invention of the present invention, in detecting the potato of the permanent magnet electric motor of the hybrid electric vehicle, the torque command value, the speed of the electric motor, the voltage of the high-voltage battery receives the synchronous coordinate system Calculating a DQ axis current setpoint on the phase; Outputting an inverter output voltage command value using a difference between the D-Q axis current command value and the measured current measurement value; Integrating the inverter output voltage command value from an input time of an engine start signal to a predetermined elapsed time and outputting a magnetic flux estimate value; And determining the potato state of the permanent magnet of the electric motor by using a difference between the magnetic flux reference value applied from the outside and the magnetic flux estimate value.

In the permanent magnet electric motor potato detection method according to the sixth invention of the present application, in detecting the potato of the permanent magnet electric motor of the hybrid electric vehicle, there is no operation of the accelerator pedal and the brake pedal, and the detection speed of the electric motor is predetermined. Outputting a DQ axis current command value as 0 if less than a range; Outputting a counter electromotive force estimate using the speed of the electric motor, the voltage of the high voltage battery unit, the current command value and the detected current measurement value; Outputting a counter electromotive force constant corresponding to a detected temperature of the electric motor by using a stored temperature constant conversion table; Outputting a counter electromotive force reference value using the counter electromotive force constant and the detection speed of the electric motor; And determining the potato state of the permanent magnet of the electric motor using the difference between the back EMF estimate and the back EMF reference value.

The permanent magnet type electric motor potato detection method of the hybrid electric vehicle according to the present invention is unnecessary because a separate voltage sensor and voltage meter for measuring the potato of the permanent magnet type electric motor are not needed, and only the control variable detects the potato state. The power density of the auxiliary device can be increased, the manufacturing cost is lowered, and the reliability of the driving auxiliary device caused by the failure of the sensor or the measuring meter can be prevented.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

2 is a block diagram of a hybrid vehicle according to the present invention.

Hybrid vehicle according to the invention, the engine driving unit 10 as the main power unit; An engine control unit 11 controlling the engine driving unit 10; A transmission unit 12; An electric motor unit 33 connected to the engine driving unit 10 in series or in parallel as a driving assistance device 30; An inverter unit 32 supplying variable energy to the electric motor unit 33; An inverter control unit 31 for monitoring the states of the inverter unit 32 and the electric motor unit 33 and controlling the inverter unit 32; A high voltage battery unit 21 supplying electric energy to the driving auxiliary device 30 and receiving the electric motor 33 and the electric energy; A battery state controller 20 for controlling a state of the high voltage battery unit 21; And an upper controller 13 for monitoring and controlling the engine controller 11, the motor controller 31, and the battery state controller 20.

When the vehicle accelerates, the electric energy of the high-voltage battery unit 21 is supplied to the inverter unit 32 of the driving assistance device 30, and the upper control unit 13 supplies the electric motor unit 33 to the inverter control unit 31. The inverter unit 32 causes stable energy to be applied to the electric motor unit 33 by outputting a driving target value. On the contrary, when the vehicle decelerates, the regenerative energy output from the electric motor unit 33 charges the high voltage battery unit 21 through the inverter unit 32. At this time, the upper control unit 13 stores the battery in the inverter control unit 31. By outputting a charging target value, the inverter unit 32 is controlled to stably charge energy in the high voltage battery unit 21. In addition, the upper control unit 13 calculates the torque command value from the driver's accelerator pedal and brake pedal operation, and outputs the torque command value to the motor control unit 31.

3 is a block diagram of a driving assistance system according to the present invention.

Drive auxiliary system according to the present invention is a high-voltage battery unit 21; Charging and discharging means 22; DC stage condenser 37; A discharge resistor 38 connected in parallel with the DC-stage condenser 37; An inverter section 32 for receiving electrical energy from / to the high voltage battery section 21; Permanent magnet type electric motor 33 consisting of three stator windings (SU, SV, SW) for generating a driving force by using the electrical energy transmitted through the inverter unit 32; By using the DC voltage feedback means 36, the inverter temperature feedback means 35, the electric current feedback means 34 of the electric motor, the speed feedback means 40 of the electric motor and the electric motor temperature feedback means 39, the electric motor ( Inverter control unit 31 for performing the control of 33).

The basic principle of the potato detection method of a permanent magnet electric motor of a hybrid electric vehicle according to the first invention of the present application is as follows.

The torque command value calculated from the driver's accelerator pedal and brake pedal operation amount during the driving or starting of the vehicle, the state of the battery voltage and the D-axis and Q-axis current command values in the synchronous coordinate system calculated from the electric motor speed, and the voltage model is calculated. The Q-axis voltage estimate is calculated using the D- and Q-axis current command values, and the current controller outputs the Q-axis voltage reference value using the calculated Q-axis current command value and the measured Q-axis current measurement value. Compare the axial voltage reference value and the Q-axis voltage estimate and determine the demagnetization state of the electric motor according to the difference. In this case, the Q-axis voltage model receives the winding resistance of the electric motor, the D-axis inductance, the linkage flux of the permanent magnet as a constant, and instantaneously receives the speed of the electric motor.

4 is a detailed control block diagram of the motor controller 31 according to the first embodiment of the present invention.

,

)를 계산하는 D-Q축 전류지령치 계산 부(41), D-Q 전류 지령치(

,

)를 이용하여 Q축 전압 추정치를 계산하는 Q축 전압 모델(42), Q축 전류 지령치와 측정된 Q축 전류 측정치의 차이를 이용하여 Q축 전압 기준치를 출력하는 Q축 전압 기준치 출력부(43), 및 Q축 전압 추정치와 Q축 전압 기준치를 이용하여 전기 모터 영구자석의 감자상태를 판단하는 감자상태판단부(44)를 포함한다. 이 때, Q축 전압 모델(42)은 전기모터부(33)에서 측정된 권선 저항(R_a), D축 인덕턴스(L_d), 영구자석의 쇄교자속(Λ_PM)과 전기모터부(33)의 회전속도를 순시적으로 입력받는다.The motor control unit 31 according to the first embodiment of the present invention receives a torque command value, a speed of the electric motor unit 33, and a voltage Vbattery of the high voltage battery unit 21. Current setpoint on phase (

,

DQ axis current command value calculating section 41 for calculating

,

Q-axis voltage model 42 that calculates the Q-axis voltage estimate using the Q-axis voltage reference value output unit 43 that outputs the Q-axis voltage reference value by using the difference between the Q-axis current command value and the measured Q-axis current measurement value. And a potato state judging portion 44 which determines the potato state of the electric motor permanent magnet by using the Q-axis voltage estimate and the Q-axis voltage reference value. At this time, the Q-axis voltage model 42 is the winding resistance (R _a ), the D-axis inductance (L _d ) measured by the electric motor unit 33, the linkage flux (Λ _PM ) of the permanent magnet and the electric motor unit ( The rotation speed of 33) is instantaneously input.

On the other hand, the Q-axis voltage model 42 calculates the Q-axis voltage estimate according to equation (1).

In addition, the Q-axis voltage reference value output unit 43 calculates the Q-axis voltage reference value according to Equation 2 from the result of current control that controls the difference between the Q-axis current command value and the Q-axis current measurement value measured on the motor controller 31. do.

)와 Q축 전압 기준 치(

)의 차이를 계산하고, 그 차이가 히스테리시스 밴드(Hysteresys Band)에서 정한 값을 초과하면 전기모터(33)의 영구자석이 감자된 것으로 판단한다.Finally, the potato state judging section 44 determines the Q-axis voltage estimate (

) And the Q-axis voltage reference value (

Calculate the difference, and if the difference exceeds the value set in the hysteresis band (Hysteresys Band) it is determined that the permanent magnet of the electric motor 33 is demagnetized.

5 is a detailed control block diagram of the motor control unit 31 according to the second embodiment of the present invention.

,

)를 계산하는 D-Q축 전류 지령치 계산부(51), D-Q 전류 지령치(

,

)를 이용하여 현재 전류의 크기 및 위상을 계산하는 전류크기위상계산부(52), 현재 전류의 크기 및 위상을 저장된 Q축 전압 테이블에 대응시켜 Q축 전압 추정치를 출력하는 Q축 전압 추정치 테이블(53), Q축 전류 지령치와 측정된 Q축 전류 측정치의 차이를 이용하여 Q축 전압 기준치를 출력하는 Q축 전압 기준치 출력부(54), 및 Q축 전압 추정치와 Q축 전압 기준치를 이용하여 전기 모터 영구자석의 감자상태를 판단하는 감자상태판단부(55)를 포함한다. The motor control unit 31 according to the second embodiment of the present invention receives a torque command value, a speed of the electric motor unit 33, and a voltage Vbattery of the high voltage battery unit 21. Current setpoint on phase (

,

), The DQ axis current command value calculation unit 51 and the DQ current command value (

,

Current magnitude phase calculation unit 52 that calculates magnitude and phase of the current current using the Q-axis voltage estimate table that outputs the Q-axis voltage estimate by mapping the magnitude and phase of the current to the stored Q-axis voltage table 53), the Q-axis voltage reference output unit 54 outputs the Q-axis voltage reference value by using the difference between the Q-axis current command value and the measured Q-axis current measurement value, and the electric power using the Q-axis voltage estimate value and the Q-axis voltage reference value. It includes a potato state determination unit 55 for determining the potato state of the motor permanent magnet.

6 is a Q-axis estimated voltage table for each phase and magnitude of the current applied to the electric motor 33 according to the second embodiment of the present invention.

)를 계산해냄으로써 완성된다. 이때, Q축 전압 추정치 테이블(53)의 종축은 전류의 크기가 위치하며 0[A]에서 IGBT 소자의 최대 정격 전류(I_{IGBT _MAX})까지 m개로 나눈 데이터가 존재하고, 횡축에는 전류의 위상이 위치하며 전기모터의 동작 영역으로 정의된 90-180도까지 n개의 데이터가 존재한다. 따라서 Q축 전압 추정치 테이블은 총 m x n개의 데이터가 존재한다.The magnitude (I _mag ) and phase (I _phase ) of the current required for the electric motor 33 are applied to the Q-axis voltage estimate voltage table 53 and the corresponding Q-axis voltage estimate (

Is calculated by calculating At this time, the vertical axis of the Q-axis voltage estimate table 53 has a current magnitude, and data divided by m from 0 [A] to the maximum rated current of the IGBT element (I _{IGBT _MAX} ) exists, and the horizontal axis shows the phase of the current. There are n data from 90 to 180 degrees, which are defined as the operating area of the electric motor. Therefore, there are a total of mxn data in the Q-axis voltage estimate table.

On the other hand, the current magnitude phase calculation unit 52 calculates the magnitude and phase of the current as shown in Equations 3 and 4.

)와 측정된 Q축 전류 측정치(

)의 차이를 제어한 결과로부터 얻은 Q축 전압 기준치(

)를 수학식5와 같이 계산한다.Then, the Q-axis voltage reference value output section 54 has a Q-axis current command value (

) And measured Q-axis current measurements (

Q-axis voltage reference value obtained from controlling the difference of

) Is calculated as shown in Equation 5.

)와 Q축 전압 기준치(

)의 차이를 계산하고, 그 차이가 히스테리시스 밴드(Hysteresys Band) 영역을 벗어나면 전기모터(33)의 영구자석이 감자된 것으로 판단한다.Finally, the potato state determination unit 55 calculates the Q-axis voltage estimated value obtained from the Q-axis voltage estimation table 53 (

) And the Q-axis voltage threshold (

), And if the difference is outside the hysteresis band region, it is determined that the permanent magnet of the electric motor 33 is demagnetized.

This method can prevent the Q-axis voltage estimation error due to the variation of the parameters (winding resistance of the electric motor, shaft inductance) generated in the potato detection method according to the first embodiment of the present invention, and the motor control unit ( 31) has the advantage of low computational burden.

7 is a detailed control block diagram of the motor control unit 31 according to the third embodiment of the present invention.

,

)를 계산하는 D-Q축 전류 지령치 계산 부(71), D-Q 전류 지령치(

,

)와 측정된 전류 측정치의 차이를 이용하여 인버터 출력전압 지령치를 출력하는 인버터 출력전압 지령치 출력부(72), 인버터 출력전압 지령치를 엔진시동신호의 입력시점으로부터 소정의 경과시간까지 적분하여 자속 추정치를 출력하는 자속 추정 적분기(73), 자속기준치와 자속추정치를 이용하여 전기 모터 영구자석의 감자상태를 판단하는 감자상태판단부(74)를 포함한다. The motor control unit 31 according to the third embodiment of the present invention receives a torque command value, a speed of the electric motor unit 33, and a voltage Vbattery of the high voltage battery unit 21. Current setpoint on phase (

,

) DQ axis current command value calculation unit 71 for calculating

,

) And the inverter output voltage command value output unit 72 for outputting the inverter output voltage command value using the difference between the measured current measurement values and the inverter output voltage command value from the time of inputting the engine start signal to a predetermined elapsed time. And a potato state judging unit 74 for judging the potato state of the permanent magnet of the electric motor by using the output magnetic flux estimating integrator 73, the magnetic flux reference value and the magnetic flux estimation value.

On the other hand, the inverter output voltage command value output unit 72 calculates the inverter output voltage command value as shown in equation (5).

In addition, the flux estimating integrator 73 integrates the inverter output voltage command value from the input point of the engine start signal to a predetermined elapsed time (Timer_set) to obtain the magnetic flux estimate of the electric motor 33 as shown in Equation (6).

Finally, the potato state determination unit 74 determines that the permanent magnet of the electric motor 33 is demagnetized when the difference between the magnetic flux estimate Λest and the magnetic flux reference value Λset is outside the hysteresis band region. Here, the magnetic flux reference value? Set is a predetermined fixed value.

8 is a detailed control block diagram of the motor control unit 31 according to the fourth embodiment of the present invention.

The motor control unit 31 according to the fourth embodiment of the present invention has no operation of the accelerator pedal and the brake pedal, and the current command value outputting the DQ axis current command value to 0 when the detection speed of the electric motor 33 is below a predetermined range. Current controller for outputting the back EMF estimate (BEMFest) using the setting unit 81, the speed of the electric motor unit 33, the voltage (Vbattery) of the high-voltage battery unit 21, the current command value and the detected current measurement value (82), the reference EMF reference value (BEMFset) using the temperature constant conversion table 83 for outputting the counter electromotive force constant corresponding to the current temperature of the detected electric motor, the speed of the electromotive force constant and the electric motor unit 33 detected. ), And a potato state determination unit 85 that determines the potato state of the permanent magnet of the electric motor by using a difference between the electromotive force estimated value and the counter electromotive force reference value.

Here, the current controller 82 receives the speed of the electric motor unit 33, the voltage Vbattery of the high voltage battery unit 21, the current command value, and the measured current measurement value, and calculates the back EMF estimate BEMFest. Calculate as 5.

,

)는 0이다.On the other hand, if the current control is performed smoothly, the measured current measured value of the electric motor (regardless of speed)

,

) Is 0.

Accordingly, the back EMF estimate of the permanent magnet electric motor may be expressed as shown in Equation (7).

In addition, since the counter electromotive force Ke changes according to the temperature of the electric motor 33, the detected current temperature of the electric motor 33 is input to the temperature constant conversion table 83 of the pre-stored electric motor 33, The back EMF constant Ke corresponding to the current temperature is output.

The counter electromotive force calculation unit 84 calculates the base electromotive force reference value of the current electric motor 33 from Equation 8 based on the counter electromotive force constant Ke and the speed of the electric motor 33.

The potato state determination unit 85 determines that the permanent magnet of the electric motor 33 is demagnetized when the difference between the back electromotive force estimate (BEMFest) and the back electromotive force reference value (BEMFset) is greater than or equal to the value set in the hysteresis band.

At this time, the counter electromotive force estimation method is performed at a speed lower than a predetermined electric motor 33 for the control stability of the inverter.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto, and the technical spirit of the present invention and the following by those skilled in the art to which the present invention pertains. Various modifications and variations are possible within the scope of equivalents of the claims to be described.

1 is a configuration diagram of a drive auxiliary system of an electric vehicle according to the prior art;

2 is a block diagram of a hybrid vehicle block according to the present invention;

3 is a configuration of a drive auxiliary system according to the present invention;

4 is a detailed control block diagram of the motor control unit 31 according to the first embodiment of the present invention;

5 is a detailed control block diagram of the motor control unit 31 according to the second embodiment of the present invention;

6 is a Q-axis estimated voltage table for each phase and magnitude of a current applied to an electric motor 33 according to a second embodiment of the present invention;

7 is a detailed control block diagram of the motor control unit 31 according to the third embodiment of the present invention, and

8 is a detailed control block diagram of the motor control unit 31 according to the fourth embodiment of the present invention.

Description of the main parts of the drawing

41: D-Q axis current command value calculation section 42: Q axis voltage model

43: Q axis voltage reference value output section 44: Potato state determination section

Claims (10)

In a hybrid electric vehicle using a permanent magnet electric motor, A D-Q axis current command value calculating unit configured to receive a torque command value, a speed of an electric motor, and a voltage of a high voltage battery to calculate a D-Q axis current command value on a synchronous coordinate system; A Q-axis voltage estimation calculator for extracting a Q-axis voltage estimate using the D-Q-axis current command value; A Q-axis voltage reference value output unit configured to output a Q-axis voltage reference value by using a difference between the Q-axis current command value and the measured Q-axis current measurement value; And Potato state determination unit for determining the potato state of the permanent magnet of the electric motor using the difference between the Q-axis voltage estimate and the Q-axis voltage reference value Permanent magnet type electric motor potato detection device comprising a. The method of claim 1, The Q-axis voltage estimate calculation unit, the permanent magnet type, characterized in that the instantaneous input of the winding resistance, the D-axis inductance, the linkage flux of the permanent magnet of the electric motor and the rotational speed of the electric motor Electric motor potato detection device. The method of claim 1, The Q-axis voltage estimate calculation unit, A current magnitude phase calculator for calculating the magnitude and phase of a current current using the D-Q axis current command value; And A Q-axis voltage table that outputs the Q-axis voltage estimate by mapping the magnitude and phase of the current to a stored Q-axis voltage table Permanent magnet type electric motor potato detection device comprising a. In a hybrid electric vehicle using a permanent magnet electric motor, A D-Q axis current command value calculating unit configured to receive a torque command value, a speed of an electric motor, and a voltage of a high voltage battery to calculate a D-Q axis current command value on a synchronous coordinate system; An inverter output voltage command value output unit configured to output an inverter output voltage command value by using a difference between the D-Q axis current command value and the measured current measurement value; A flux estimate integrator for integrating the inverter output voltage command value from an input time of an engine start signal to a predetermined elapsed time and outputting a flux estimate; And Potato state determination unit for determining the potato state of the permanent magnet of the electric motor by using the magnetic flux reference value and the magnetic flux estimate value applied from the outside Permanent magnet type electric motor potato detection device comprising a. In a hybrid electric vehicle using a permanent magnet electric motor, A current command value setting unit which does not operate the accelerator pedal and the brake pedal, and outputs a D-Q axis current command value as 0 when the detection speed of the electric motor is less than a predetermined range; A current controller for outputting a counter electromotive force estimate using the speed of the electric motor, the voltage of the high voltage battery unit, the current command value, and the detected current measurement value; A temperature constant conversion table for outputting a counter electromotive force constant corresponding to the detected temperature of the electric motor; A counter electromotive force calculator configured to output a counter electromotive force reference value using the counter electromotive force constant and the detection speed of the electric motor; And Potato state determination unit for determining the potato state of the permanent magnet of the electric motor by using the difference between the back EMF estimate and the back EMF reference value Permanent magnet type electric motor potato detection device comprising a. In detecting the potato of the permanent magnet electric motor of the hybrid electric vehicle, A first step of calculating the D-Q axis current command value on the synchronous coordinate system by receiving the torque command value, the speed of the electric motor, and the voltage of the high voltage battery; Extracting a Q-axis voltage estimate using the D-Q-axis current command value; Outputting a Q-axis voltage reference value by using a difference between the Q-axis current command value and the measured Q-axis current measurement value; And A fourth step of determining the demagnetization state of the permanent magnet of the electric motor by using the difference between the Q-axis voltage estimate and the Q-axis voltage reference value Permanent magnet type electric motor potato detection method comprising a. The method of claim 6, In the second step, the Q-axis voltage estimate may be extracted by instantaneously receiving the winding resistance, the D-axis inductance measured by the electric motor, the linkage flux of the permanent magnet of the electric motor, and the rotational speed of the electric motor. Permanent magnet electric motor potato detection method. The method of claim 6, The second step, Calculating a magnitude and phase of a current current using the D-Q axis current command value; And Outputting the Q-axis voltage estimate by matching the magnitude and phase of the current to a stored Q-axis voltage table Permanent magnet type electric motor potato detection method comprising a. In detecting the potato of the permanent magnet electric motor of the hybrid electric vehicle, Calculating a D-Q axis current command value on a synchronous coordinate system by receiving a torque command value, a speed of an electric motor, and a voltage of a high voltage battery; Outputting an inverter output voltage command value using a difference between the D-Q axis current command value and the measured current measurement value; Integrating the inverter output voltage command value from an input time of an engine start signal to a predetermined elapsed time and outputting a magnetic flux estimate value; And Determining the potato state of the permanent magnet of the electric motor by using a difference between the magnetic flux reference value applied from the outside and the magnetic flux estimate value Permanent magnet type electric motor potato detection method comprising a. In detecting the potato of the permanent magnet electric motor of the hybrid electric vehicle, Outputting a D-Q axis current command value as 0 when there is no operation of the accelerator pedal and the brake pedal, and the detection speed of the electric motor is less than a predetermined range; Outputting a counter electromotive force estimate using the speed of the electric motor, the voltage of the high voltage battery unit, the current command value and the detected current measurement value; Outputting a counter electromotive force constant corresponding to a detected temperature of the electric motor by using a stored temperature constant conversion table; Outputting a counter electromotive force reference value using the counter electromotive force constant and the detection speed of the electric motor; And Determining a potato state of the permanent magnet of the electric motor using the difference between the back EMF estimate and the back EMF reference value Permanent magnet type electric motor potato detection method comprising a.

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