JP5082216B2 - Rotation detection device for turbocharger with electric motor and rotation detection method for turbocharger with electric motor - Google Patents

Description

  The present invention relates to a rotation detection device for a turbocharger with an electric motor and a rotation detection method for a turbocharger with an electric motor.

Non-Patent Document 1 below discloses a drive system for a PM motor (permanent magnet type synchronous motor) incorporated in a turbocharger. A turbocharger incorporating a PM motor (hybrid turbocharger) is one in which a rotor of a PM motor is integrated with a rotating shaft of the turbocharger, and assists the rotation of the turbocharger by the rotational power of the PM motor. . This drive system employs a brushless DC motor (sensorless brushless DC motor) that does not include a position sensor that detects the rotational position of the rotor as a PM motor that is an auxiliary motor for the turbocharger. It is driven by an energization method, and a drive current for each phase is generated by determining the rotational position of the rotor using the induced voltage induced in the stator winding during the non-energization period.
Note that the details of the control technology of the sensorless brushless DC motor that adopts the 180 ° energization method instead of the 120 ° energization method are disclosed in, for example, Non-Patent Documents 2 and 3 and Patent Document 1 below.
Yosuke Takada et al .: “220000 r / min −2 kW PM motor drive system for turbochargers”, 2004 IEEJ Industrial Application Conference Conference Proceedings Takaharu Takeshita et al .: "Sensorless brushless DC motor control based on current estimation error", Proc. Masato Ichikawa: “Sensorless control of IPMSM by estimation of extended induced voltage in rotating coordinate system”, Proceedings of Annual Conference of IEEJ Hiroshi Osawa: "High-performance V / f control of embedded magnet type PM motor", Techno Frontier Symposium 2004 Motor Technology Symposium, Japan Management Association JP 2005-137106 A

The hybrid turbocharger described above functions as an auxiliary machine that assists the engine (main machine), and the auxiliary motor is controlled by an engine control unit (ECU) in the same manner as the engine. That is, the motor driving device that drives the auxiliary motor drives the auxiliary motor under the control of the engine control device that is the host control device.
However, a technique for providing the engine control device with the rotational speed information of the sensorless brushless DC motor (that is, the rotational speed information of the turbocharger) when a sensorless brushless DC motor is used as the auxiliary motor has not yet been established. In particular, in the control of the auxiliary motor in a high-speed rotation region exceeding 100,000 rotations, the engine control device requires extremely accurate rotational speed information regarding the sensorless brushless DC motor in order to control the auxiliary motor. At present, the technology for providing accurate engine speed information to the engine control device has not yet been established.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an engine control device with a rotation state, in particular, a highly accurate rotation state, of a turbocharger with an electric motor that employs a sensorless permanent magnet synchronous motor. .

  In order to achieve the above object, in the present invention, a sensorless permanent magnet synchronous motor driven by an inverter under the control of a motor control device is provided in an engine as a first solving means related to a rotation detecting device for a turbocharger with an electric motor. In an apparatus for detecting the rotation state of a turbocharger with an electric motor attached to an attached turbocharger, an induced voltage detection means for detecting an induced voltage induced in a stator winding of a permanent magnet synchronous motor, and an inverter from a stator winding Rotation state for detecting the rotation state when the sensorless permanent magnet synchronous motor is not driven based on the induced voltage detected by the induced voltage detection means and the drive current detection means for detecting the multi-phase motor drive current supplied to the wire Sensorless permanent detection based on the detection means and the motor drive current detected by the drive current detection means While selecting the rotation state estimation means for estimating the rotation state at the time of driving the magnet synchronous motor and the detection result of the rotation speed detection means at the time of non-driving, the estimation result of the rotation speed estimation means is selected at the time of driving to the engine control device. An output selection means for outputting is adopted.

  As a second solution to the rotation detecting device for a turbocharger with an electric motor, a turbo with an electric motor attached to a turbocharger attached to an engine by a sensorless permanent magnet synchronous motor driven by an inverter under the control of a motor control device In an apparatus for detecting the rotation state of a charger, an induced voltage detecting means for detecting an induced voltage induced in a stator winding of a permanent magnet synchronous motor, a power supply current detecting means for detecting a power supply current supplied to an inverter, an induction The rotation state detection means for detecting the rotation state when the sensorless permanent magnet synchronous motor is not driven based on the induced voltage detected by the voltage detection means, and the sensorless permanent magnet synchronous motor based on the power supply current detected by the power supply current detection means. Rotation state estimation means for estimating the rotation state during driving, and during non-driving While selecting the detection result of the rotation state detecting means, and an output selecting means for selecting and outputting an estimation result of the rotation state estimation unit to the engine control unit at the time of driving, to adopt a means of.

  As a third means for solving the rotation detecting device for a turbocharger with an electric motor, a turbo with an electric motor attached to a turbocharger attached to an engine is a sensorless permanent magnet synchronous motor driven by an inverter under the control of a motor control device. In the device for detecting the rotation state of the charger, an induced voltage detecting means for detecting an induced voltage induced in the stator winding of the permanent magnet synchronous motor, an arm current detecting means for detecting an arm current flowing through the switch arm of the inverter, Rotation state detection means for detecting a rotation state when the sensorless permanent magnet synchronous motor is not driven based on the induced voltage detected by the induced voltage detection means, and a sensorless permanent magnet synchronous motor based on the arm current detected by the arm current detection means Rotational state estimation to estimate the rotational state during driving And means for selecting a detection result of the rotation state detection means when not driven, and an output selection means for selecting the estimation result of the rotation state estimation means during driving and outputting the result to the engine control device. .

  As a fourth solving means related to the rotation detecting device for a turbocharger with an electric motor, in any one of the first to third means, the rotation state detecting means rotates the sensorless permanent magnet synchronous motor based on the zero cross point of the induced voltage. A means of detecting the state is adopted.

  As a fifth solving means related to the rotation detecting device for a turbocharger with an electric motor, in any one of the first to third means, the rotation state detecting means is a sensorless permanent magnet based on a difference between induced voltages of motor driving phases. A means of detecting the rotation state of the synchronous motor is employed.

  As a sixth solving means relating to the rotation detection device for a turbocharger with an electric motor, in any one of the first to fifth means, the rotation state detection means detects the rotation speed of the sensorless permanent magnet synchronous motor as the rotation state, and rotates. The state estimation means employs means for estimating the rotation speed of the sensorless permanent magnet synchronous motor as the rotation state.

  Further, in the present invention, as a solution for the rotation detection method of the turbocharger with an electric motor, a sensorless permanent magnet synchronous motor driven by an inverter under the control of the motor control device is attached to the turbocharger attached to the engine. In the method of detecting the rotation state of a turbocharger with an electric motor, the rotation state when the sensorless permanent magnet synchronous motor is not driven is detected based on the induced voltage induced in the stator winding of the sensorless permanent magnet synchronous motor and fixed from the inverter. Estimates the rotational state when driving a sensorless permanent magnet synchronous motor based on the motor drive current of multiple phases supplied to the slave winding, the power supply current supplied to the inverter or the arm current flowing through the switch arm of the inverter, and is not driven Rotation detected sometimes based on induced voltage You select one to be output to the engine control unit, the motor drive current at the time of driving, by selecting the rotational state that is estimated based on the power supply current or arm current outputs to the engine control unit, employing the means of.

  Since the turbocharger with electric motor is attached to the engine, the ambient temperature changes greatly. However, according to the present invention, in spite of such a poor temperature environment, the sensorless permanent magnet synchronous motor is not driven in the turbocharger with an electric motor provided with a sensorless permanent magnet synchronous motor without a position sensor as an auxiliary motor. Sometimes, the rotational state detected based on the induced voltage is output to the engine control device, while when the sensorless permanent magnet synchronous motor is driven, the rotational state estimated based on the motor drive current, power supply current or arm current is sent to the engine control device. Since it outputs, the rotation state of the turbocharger with an electric motor can be provided to the engine control device.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a functional configuration of a rotation detection device for a turbocharger with an electric motor and related devices according to the present embodiment. In this figure, reference numeral 1 is a motor drive device, 2 is a turbocharger with an electric motor, 3A and 3B are current detectors, 4 is a voltage detector, 5 is a motor control device, 6 is a speed detector, and 7 is an output switch. . Among these components, the current detectors 3A and 3B, the voltage detector 4, the motor control device 5, the speed detector 6 and the output switch 7 constitute the rotation detection device for a turbocharger with an electric motor according to this embodiment. ing.

  As shown in the figure, the motor drive device 1 is composed of a DC power source 1a, a booster circuit 1b and an inverter 1c, and the turbocharger 2 with an electric motor is composed of a permanent magnet type synchronous motor 2a and a turbocharger 2b. The motor drive device 1 generates a motor drive signal (AC signal) based on a DC voltage (power supply voltage) output from the DC power supply 1a to drive the permanent magnet type synchronous motor 2a. The DC power source 1a is one in which one or a plurality of batteries are connected in series, and outputs a predetermined DC voltage to the booster circuit 1b. The booster circuit 1b is provided as necessary, boosts the DC voltage supplied from the DC power source 1a, and supplies it to the inverter 1b. The inverter 1b switches the DC voltage supplied from the booster circuit 1b based on the PWM signal supplied from the motor control device 5, thereby making a three-phase motor composed of a U phase, a V phase and a W phase as shown in the figure. A drive signal is generated.

 The permanent magnet type synchronous motor 2a is a sensorless permanent magnet type synchronous motor that does not include a sensor for detecting the rotation (rotation position, rotation speed and / or rotation speed) of the rotor, and rotates the turbocharger 2b as an auxiliary motor. It is to assist. As is well known, the turbocharger 2b includes a turbine and a compressor, and is attached to the engine as an auxiliary machine.

  The current detector 3A is provided on a U-phase drive signal line that connects the U-phase output terminal of the inverter 1b and the U-phase stator winding of the permanent magnet type synchronous motor 2a. The motor drive current Iu flowing through the phase stator winding is detected and output to the motor controller 5 described below. On the other hand, the current detector 3B is provided on a V-phase drive signal line connecting the V-phase output terminal of the inverter 1b and the V-phase stator winding of the permanent magnet type synchronous motor 2a. The motor drive current Iv flowing through the V-phase stator winding is detected and output to the motor controller 5 below.

  The voltage detector 4 detects the induced voltage induced in the U-phase drive signal line, and outputs it to the speed detector 6 as an induced voltage detection value. When the motor driving device 1 is in a non-driving state, that is, when the inverter 1b is not in a state of supplying a motor driving signal to the permanent magnet type synchronous motor 2a, the U-phase driving signal line has a U-phase stator winding and a permanent magnet. A sinusoidal induced voltage is generated by electromagnetic induction with a rotor composed of The voltage detector 4 outputs such an induced voltage to the speed detector 6 as an induced voltage detection value.

  As shown, the motor controller 5 includes a subtractor 5a, a speed controller 5b, a current controller 5c, coordinate converters 5d and 5f, a rotor position / speed estimator 5e, and a PWM (Pulse Width Wodulation) signal generator 5g. The rotation of the permanent magnet type synchronous motor 2a is controlled by PWM control of the inverter 1b.

The subtractor 5a calculates the difference between the angular velocity target value ω ₀ supplied from the engine control unit (ECU), which is a host controller, and the estimated angular velocity value ω e output from the rotor position / speed estimator 5e as a velocity error Δω. Output to the speed controller 5b. The speed controller 5b is a kind of PID controller, and calculates a current manipulated variable Iqs corresponding to the speed error Δω by performing a predetermined proportional integral / differential operation on the speed error Δω to the current controller 5c. Output.

  The current controller 5c has a current operation amount Iqs based on the current operation amount Iqs, the current operation amount Ids supplied from the engine control unit (ECU), and the drive current detection amounts Iq and Id input from the coordinate converter 5d. The voltage manipulated variables Vq and Vd respectively corresponding to Ids are calculated and output to the rotor position / speed estimator 5e and the coordinate converter 5f. The current controller 5c is a kind of PID controller, and generates voltage manipulated variables Vq and Vd by performing predetermined proportional integral / derivative operations on the current manipulated variables Iqs and Ids, respectively.

  The coordinate converter 5d is fixed on the rotor of the permanent magnet synchronous motor 2a based on the U-phase and V-phase motor drive currents Iu and Iv (detected amounts) detected by the current detectors 3A and 3B, respectively. A q-axis drive current detection amount Iq and a d-axis drive current detection amount Id are generated on a two-dimensional coordinate system (a coordinate system composed of q-axis and d-axis). More specifically, the coordinate converter 5d obtains a W-phase motor drive current Iw by an internal calculation based on the motor drive currents Iu and Iv, and a motor on a three-dimensional coordinate system composed of the U-phase, V-phase, and W-phase. The drive current detection amounts Iq and Id are obtained by performing predetermined coordinate transformation on the drive currents Iu, Iv and Iw. The d-axis is a coordinate axis set in the opposing direction of the S-pole and N-pole of the permanent magnet on the rotating surface of the rotor, and the d-axis is a coordinate axis orthogonal to the q-axis described above.

  The rotor position / speed estimator 5e estimates the rotation state of the permanent magnet type synchronous motor 2a based on the drive current detection amounts Iq and Id and the voltage operation amounts Vq and Vd. The rotor position / speed estimator 5e includes, for example, a motor model that simulates a permanent magnet type synchronous motor 2a, and inputs voltage operation amounts Vq and Vd and drive current detection amounts Iq and Id to the motor model. As a result, the estimated angular velocity value ωe and the estimated rotational angle value θe are calculated. The rotor position / speed estimator 5e outputs the estimated rotational angle value θe estimated by such a method to the coordinate converters 5d and 5f, and outputs the estimated angular speed value ωe to the subtractor 5a and the output switch 7.

 In rotation control of a sensorless permanent magnet synchronous motor, the angular velocity and rotation angle of the sensorless permanent magnet synchronous motor are generally estimated by some method, and the sensorless permanent magnet synchronous motor is vector-controlled based on the estimated value. Alternatively, V / f control is performed. The estimation method of the angular velocity estimation value ωe1 and the rotation angle estimation value θe in the rotor position / speed estimator 5e is equivalent to the method described in Non-Patent Document 2, but Non-Patent Documents 3 and 4 and Patent Document 1 Discloses an estimation method of angular velocity, rotation angle, and the like in rotation control of a sensorless permanent magnet type synchronous motor. Therefore, the methods disclosed in Non-Patent Documents 3 and 4 and Patent Document 1 may be used as the estimation methods of the angular velocity estimation value ωe1 and the rotation angle estimation value θe in the rotor position / speed estimator 5e.

  The coordinate converter 5f uses the voltage operation amounts Vq and Vd corresponding to the q axis and the d axis input from the current controller 5c based on the estimated rotation angle θe input from the rotor position / speed estimator 5e. The voltage manipulated variables Vu, Vv, Vw are converted into voltage manipulated variables Vu, Vv, Vw on a three-dimensional coordinate system composed of U phase, V phase, and W phase, and the voltage manipulated variables Vu, Vv, Vw are output to the PWM signal generator 5g.

  The PWM signal generator 5g generates a PWM signal for switching the inverter 1b based on the voltage manipulated variables Vu, Vv, Vw and outputs the PWM signal to the inverter 1b. The motor control device 5 operates based on a sine wave energization method, and therefore, the PWM signal generator 5g causes the inverter 1b to output a motor drive signal over the entire rotation angle (360 °) of the permanent magnet type synchronous motor 2a. A PWM signal is output so as to be output.

  The speed detector 6 includes a comparator 6a and an F / V converter 6b as shown in the figure. The comparator 6a compares the induced voltage detection value input from the voltage detector 4 with the ground voltage to generate a pulse signal that makes a state transition at the zero cross point of the induced voltage, and outputs the pulse signal to the F / V converter 6b. The F / V converter 6b converts the pulse signal into a DC voltage corresponding to the frequency, and outputs it to the output switch 7 as an angular velocity detection value ωk.

  The output switch 7 is an angular velocity estimation value ωe input from the rotor position / speed estimator 5e or an angular velocity detection value ωk input from the speed detector 6 based on an operation instruction signal J supplied from an engine control unit (ECU). Are alternatively selected and output to the engine control unit (ECU) as an angular velocity signal ω. The operation instruction signal J instructs the motor controller 5 to assist the turbocharger 2b with the permanent magnet type synchronous motor 2a, and instructs the output switch 7 to switch between the estimated angular velocity value ωe and the detected angular velocity value ωk. Is to do.

  Next, the operation of the rotation detector for a turbocharger with an electric motor configured as described above will be described in detail with reference to FIG.

  FIG. 2 shows changes in the rotational speed of the turbocharger 2 with electric motor. The turbocharger with electric motor 2 increases in rotational speed when the turbine is driven by engine exhaust gas, while the rotational speed also increases with assistance from the permanent magnet type synchronous motor 2a. Assist by the permanent magnet type synchronous motor 2a is performed in order to increase the rotational speed of the turbocharger with electric motor 2 at a high speed, as shown by “electric assist” shown in the figure. With the assistance of the permanent magnet type synchronous motor 2a, the rotational speed of the turbocharger 2 with the electric motor rapidly increases, for example, from a low speed rotational speed a1 to a high speed rotational speed a2 exceeding 100,000.

  When “motor assist” is instructed by an operation instruction signal J input from an engine control unit (ECU), the motor control device 5 operates the motor drive device 1 to drive the permanent magnet type synchronous motor 2a. On the other hand, when the operation instruction signal J does not indicate “motor assist” (in the case of non-motor assist), the operation of the motor drive device 1 is stopped and the permanent magnet type synchronous motor 2a is not driven. Thus, in a state where the motor drive device 1 has stopped operating, the permanent magnet type synchronous motor 2a rotates freely in synchronization with the rotation of the turbocharger 2b.

Hereinafter, the operation of the rotation detection device for a turbocharger with an electric motor will be described for each case of non-motor assist and motor assist.
[Non-motor assist]
In this case, since the motor drive device 1 stops operating and does not supply a motor drive signal to the permanent magnet type synchronous motor 2a, each phase (U phase, V phase, and the phase connecting the inverter 1b and the permanent magnet type synchronous motor 2a). The W-phase drive signal line is in a high impedance state. As a result, a sinusoidal induced voltage is generated in each drive signal line by electromagnetic induction between the stator winding and the rotor. Since the induced voltage is induced by electromagnetic induction between the stator winding and the rotor of the permanent magnet type synchronous motor 2a, the ground potential (zero potential) is set as the center potential, and the rotational peripheral period (angular velocity) of the rotor. AC voltage with an angular frequency corresponding to.

 The voltage detector 4 provided on the U-phase drive signal line detects the induced voltage of the U-phase drive signal line, and detects the induced voltage of the speed detector 6 as an induced voltage detection value (precisely, a U-phase induced voltage detection value). Output to the comparator 6a. This induced voltage detection value is converted to a pulse signal that undergoes a state transition at a zero cross point (a point that crosses the ground potential) by being compared with the ground potential by the comparator 6a. This pulse signal is a signal synchronized with the rotation circumferential cycle of the rotor, and is converted into a DC voltage corresponding to the angular velocity of the rotor by being input to the F / V converter 6b.

 That is, the angular velocity detection value ωk output from the F / V converter 6b to the output switch 7 is generated based on the U-phase induced voltage detection value, and is a detection signal indicating the angular velocity of the permanent magnet type synchronous motor 2a. It is. The output switch 7 outputs the angular velocity detection value ωk to the engine control device (ECU) as the angular velocity signal ω in the case of non-motor assist, that is, when the engine control device (ECU) instructs “motor assist”.

 As described above, when the angular velocity detection value ωk is generated based on the pulse signal that makes a state transition at the zero crossing point of the induced voltage of the permanent magnet type synchronous motor 2a, the amplitude of the induced voltage varies due to temperature variation or the like. Even so, a highly accurate angular velocity can be detected without being affected by the fluctuation.

[During motor assist]
Subsequently, at the time of assisting the motor, a motor drive signal is supplied from the inverter 1b to the permanent magnet type synchronous motor 2a via the drive signal line of each phase, and the permanent magnet type synchronous motor 2a is rotationally driven. Here, since the motor control device 5 employs a sine wave energization method, a motor drive signal is always output from the inverter 1b to the permanent magnet type synchronous motor 2a during motor assist, and as a result, a drive signal line for each phase is output. Does not generate an induced voltage. Therefore, at the time of motor assist, the angular velocity detection value ωk is not output from the speed detector 6, and the output switch 7 outputs the angular velocity estimation value ωe input from the motor control device 5 to the engine control device (ECU) as the angular velocity signal ω. To do.

  The U-phase and V-phase motor drive currents Iu and Iv output from the current detectors 3A and 3B are input to the coordinate converter 5d. The coordinate converter 5d calculates the motor driving current Iw of the other phase, that is, the W phase, from the motor driving currents Iu and Iv of the U phase and the V phase, and motor driving currents of three phases (U phase, V phase and W phase). By applying a coordinate conversion process to Iu, Iv, and Iw using a conversion matrix composed of elements corresponding to the estimated rotation angle θe, the q axis in the q axis-d axis coordinate system inherent to the permanent magnet type synchronous motor 2a is obtained. A drive current detection amount Iq and a d-axis drive current detection amount Id are generated.

On the other hand, at the time of assisting the motor, an angular velocity target value ω ₀ is input from the engine control unit (ECU) to the subtractor 5a, and a current operation corresponding to the target value of the drive current detection amount Id is also input from the engine control unit (ECU). The quantity Ids is input to the current controller 5c. Here, the current manipulated variable Ids is set to “0”.

The subtractor 5a generates a speed error Δω by calculating a difference between the angular speed target value ω ₀ and the angular speed estimated value ωe of the permanent magnet type synchronous motor 2a input from the rotor position / speed estimator 5e. The controller 5b generates a current operation amount Iqs corresponding to the drive current detection amount Iq by subjecting the speed error Δω to proportional integration / differentiation processing. Then, the current controller 5c performs proportional integral / differential operations on the current manipulated variables Iqs and Ids, thereby obtaining voltage manipulated variables Vq and Vd corresponding to the drive voltage to be applied to the permanent magnet type synchronous motor 2a. Generate.

  Then, the rotor position / speed estimator 5e is connected to the rotor of the permanent magnet type synchronous motor 2a. The q-axis drive current detection amount Iq, the voltage operation amount Vq, and the d-axis in the q-axis-d-axis coordinate system are set. The angular velocity estimation value ωe and the rotation angle estimation value θe are estimated using the drive current detection amount Id and the voltage operation amount Vd as input signals.

 That is, the rotor position / speed estimator 5e estimates the drive current detection amounts Iq and Id indicating the drive current supplied from the inverter 1c to the permanent magnet type synchronous motor 2a and the rotation angle of the permanent magnet type synchronous motor 2a estimated by itself. Using the drive current detection amounts Iq and Id generated based on the value θe and the voltage manipulated variables Vq and Vd that are generated based on the angular velocity estimated value ωe estimated by the driver and that regulate the generation of the PMW signal. Since the estimated angular velocity value ωe and the estimated rotational angle value θe are estimated, the estimated angular velocity value ωe and the estimated rotational angle value θe are values that accurately indicate the rotation state of the permanent magnet type synchronous motor 2a.

  Here, during the above-described non-motor assist, since the motor drive signal is not supplied from the inverter 1b to the permanent magnet synchronous motor 2a, the motor drive currents Iu and Iv cannot be detected by the current detectors 3A and 3B. Therefore, at the time of non-motor assist, the rotor position / speed estimator 5e cannot accurately calculate the angular speed estimated value ωe.

  According to the present embodiment, as shown in FIG. 2, the angular velocity detection value ωk output from the velocity detector 6 based on the induced voltage at the time of non-motor assist is provided to the engine control unit (ECU) as rotation information of the turbocharger 2b. On the other hand, when the induced voltage cannot be obtained from the permanent magnet type synchronous motor 2a at the time of assisting the motor and the speed detector 6 does not function, the estimated angular velocity value ωe obtained from the motor control device 5 is used as the rotation information. Since it is provided to the control device (ECU), highly accurate rotation information can always be provided to the engine control device (ECU) regardless of the assist state of the turbocharger 2b by the permanent magnet type synchronous motor 2a.

In addition, this invention is not limited to the said embodiment, For example, the following modifications can be considered.
(1) In the above embodiment, the motor drive currents Iu and Iv are detected by the current detectors 3A and 3B, and the motor drive currents Iu and Iv are supplied to the motor controller 5 to rotate the permanent magnet type synchronous motor 2a. The drive current detection amounts Iq and Id in the q-axis / d-axis coordinate system specific to the child are calculated. Instead, as shown in FIG. 3, the power supply current Ip supplied from the booster circuit 1b to the inverter 1c is calculated as a current. It is also possible to calculate the drive current detection amounts Iq and Id by detecting with the detector 3C and supplying the power supply current Ip to the motor control device 5A. Further, instead of calculating the drive current detection amounts Iq and Id, the motor drive currents Iu and Iv, the motor drive currents Iv and Iw, the motor drive currents Iu and Iw, or the motor drive currents Iu, Iv, Iw may be calculated.

The motor control device 5A in this case has a configuration in which a phase current reproducer 5h is added to the motor control device 5 as shown in FIG. The phase current reproducer 5h converts the power supply current Ip into a three-phase motor drive current Iu based on the PWM signal supplied from the PWM signal generator 5g and the rotation angle estimated value θe supplied from the rotor position / speed estimator 5e. , Iv, Iw. In the motor control device 5, the coordinate converter 5d calculates the W-phase motor drive current Iw from the U-phase and V-phase motor drive currents Iu and Iv. In the motor control device 5A, the phase current reproducer 5h is used. Since the W-phase motor drive current Iw is generated in FIG. 5, the coordinate converter 5d ′ performs only the coordinate conversion processing.
In the apparatus of FIG. 3, the current detector 3C is provided on the + side of the power source to detect the power source current Ip. However, the current detector 3C is provided on the − side of the power source to detect the power source current Ip. Anyway.

(2) FIG. 5 is a block diagram showing a modification of the apparatus shown in FIG. As shown in this figure, since the inverter 1c drives a permanent magnet type synchronous motor 2a which is a three-phase motor, three switch arms 1d to 1f corresponding to each phase (U phase, V phase and W phase). It has. In the apparatus of FIG. 3, the power supply current Ip supplied from the booster circuit 1b to the inverter 1c is detected. However, in the apparatus according to this modification, the arm current Ia flowing through the switch arms 1d to 1f is detected by the current detector 3D. It supplies to the motor control apparatus 5A mentioned above. Although the current detector 3D is provided in the U-phase switch arm 1d in FIG. 5, it may be provided in other phases, that is, the V-phase or W-phase switch arms 1e and 1f.

(3) In the above embodiment, the angular velocity detection value ωk is generated by the voltage detector 4 and the velocity detector 6 that detect the U-phase induced voltage eu. However, the method of generating the angular velocity detection value ωk is not limited to this. . For example, as shown in FIG. 6, in addition to the voltage detector 4, a voltage detector 4A for detecting the induced voltage ev of the V phase is provided, and the induced voltages eu and ev of the U phase and the V phase are supplied to the voltage detector 6A. Alternatively, the induced voltages eu and ev may be compared by a comparator to generate a pulse signal that makes a state transition at a timing when the magnitude relationship between the two is reversed. Since the induced voltages eu and ev have a phase difference of 120 °, the magnitude relationship is reversed twice during one period. The induced voltage supplied to the voltage detector 6A is not limited to the induced voltages eu and ev of the U phase and the V phase, and any two of the three phases (U phase, V phase, and W phase) can be selected. It ’s fine.

(4) In the above embodiment, the speed detector 6 including the comparator 6a and the F / V converter 6b is used. However, the configuration of the speed detector 6 is not limited to this. Any other configuration may be used as long as it converts the fluctuation period of the induced voltage supplied from the voltage detector 4 into a DC voltage. As other configuration examples, for example, a configuration using a PLL (Phas Locked Loop) circuit or a software processing using a microcomputer can be considered.

(5) In the above embodiment, the angular velocity estimated value ωe and the detected angular velocity value ωk are output to the engine controller (ECU) as the switching angular velocity signal ω based on the operation instruction signal J supplied from the engine controller (ECU). However, instead of this, the operation instruction signal J may be generated in the motor control device 5. Since the angular velocity target value ω ₀ and the current operation amount Ids are supplied from the engine control unit (ECU) to the motor control device 5 only when the motor is assisted, the motor control device 5 supplies the angular velocity target value ω ₀ or the current operation amount Ids. / Non-supply is determined, and the operation instruction signal J is generated based on the determination result.

(6) Furthermore, in the above embodiment, the current operation amount Ids is set to “0”, but this is generally performed in vector control. However, the present invention is not limited to this. A constant other than “0” may be set in the current operation amount Ids as necessary. Further, the current control amount Ids may be generated by the motor control device 5 itself.

(7) The current operation amount Ids is set as a constant, and the operation instruction signal J can be generated in the motor control device 5 based on the angular velocity target value ω ₀ , so that the engine control device (ECU ) To the motor controller 5 or the output switch 7 may be only the angular velocity target value ω ₀ .

(8) By providing the speed controller 5b on the engine control unit (ECU) side, the current target value I ₀ may be supplied to the motor control device instead of the angular speed target value ω ₀ .

It is a block diagram which shows the function structure of the rotation detection apparatus for turbochargers with an electric motor concerning one Embodiment of this invention, and its related apparatus. In one Embodiment of this invention, it is a figure which shows the rotation speed change of the turbocharger 2 with an electric motor. It is a whole block diagram which shows the 1st modification of one Embodiment of this invention. It is a block diagram of motor control device 5A in the 1st modification of the above. It is a whole block diagram which shows the 2nd modification of one Embodiment of this invention. It is a whole block diagram which shows the 3rd modification of one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Motor drive device, 2 ... Turbocharger with an electric motor, 3A, 3B ... Current detector, 4 ... Voltage detector, 5 ... Motor control device, 6 ... Speed detector, 7 ... Output switch

Claims (7)

A sensorless permanent magnet synchronous motor driven by an inverter under vector control by a motor control device is a device for detecting a rotation state of a motorized turbocharger attached to a turbocharger attached to an engine,
Induced voltage detection means for detecting an induced voltage induced in a stator winding of the permanent magnet synchronous motor;
Drive current detection means for detecting each of a plurality of phases of motor drive current supplied from the inverter to the stator winding;
Rotation state detection means for detecting a rotation state when the sensorless permanent magnet synchronous motor is not driven based on the induced voltage detected by the induced voltage detection means;
A d-axis set in a facing direction between the south pole and the north pole of the permanent magnet on the rotation surface of the rotor of the sensorless permanent magnet synchronous motor from the motor driving current detected by the driving current detection means ; and each of the basis of the drive current detection amount obtained for the coordinate axes, the rotation state estimation means for estimating the rotational state at the time of driving the sensorless permanent magnet synchronous motor and the q-axis perpendicular to,
Output selection means for selecting a detection result of the rotation state detection means during the non-driving and selecting an estimation result of the rotation state estimation means during the driving and outputting the estimation result to the engine control device. Rotation detector for turbocharger with electric motor. A sensorless permanent magnet synchronous motor driven by an inverter under vector control by a motor control device is a device for detecting a rotation state of a motorized turbocharger attached to a turbocharger attached to an engine,
Induced voltage detection means for detecting an induced voltage induced in a stator winding of the permanent magnet synchronous motor;
Power supply current detection means for detecting a power supply current supplied to the inverter;
Rotation state detection means for detecting a rotation state when the sensorless permanent magnet synchronous motor is not driven based on the induced voltage detected by the induced voltage detection means;
From the power source current detected by the power source current detecting means, the d axis set in the opposing direction of the S pole and the N pole of the permanent magnet on the rotating surface of the rotor of the sensorless permanent magnet synchronous motor, and the d axis based on the drive current detection quantity obtained for each of the coordinate axes of the q-axis orthogonal, the rotational state estimating means for estimating a rotational state at the time of driving the sensorless permanent magnet synchronous motor,
Output selection means for selecting a detection result of the rotation state detection means during the non-driving and selecting an estimation result of the rotation state estimation means during the driving and outputting the estimation result to the engine control device. Rotation detector for turbocharger with electric motor. A sensorless permanent magnet synchronous motor driven by an inverter under vector control by a motor control device is a device for detecting a rotation state of a motorized turbocharger attached to a turbocharger attached to an engine,
Induced voltage detection means for detecting an induced voltage induced in a stator winding of the permanent magnet synchronous motor;
Arm current detection means for detecting an arm current flowing in the switch arm of the inverter;
Rotation state detection means for detecting a rotation state when the sensorless permanent magnet synchronous motor is not driven based on the induced voltage detected by the induced voltage detection means;
From the arm current detected by the arm current detection means, the d-axis set in the opposing direction of the S-pole and N-pole of the permanent magnet on the rotating surface of the rotor of the sensorless permanent magnet synchronous motor, and the d-axis based on the drive current detection quantity obtained for each of the coordinate axes of the q-axis orthogonal, the rotational state estimating means for estimating a rotational state at the time of driving the sensorless permanent magnet synchronous motor,
Output selection means for selecting a detection result of the rotation state detection means during the non-driving and selecting an estimation result of the rotation state estimation means during the driving and outputting the estimation result to the engine control device. Rotation detector for turbocharger with electric motor.  The rotation detection device for a turbocharger with an electric motor according to any one of claims 1 to 3, wherein the rotation state detection means detects a rotation state of the sensorless permanent magnet synchronous motor based on a zero cross point of the induced voltage.  The rotation state detecting means detects the rotation state of the sensorless permanent magnet synchronous motor based on the difference between the induced voltages of the respective motor drive phases. Detection device.  6. The rotation state detecting means detects a rotation speed of a sensorless permanent magnet synchronous motor as a rotation state, and the rotation state estimation means estimates a rotation speed of the sensorless permanent magnet synchronous motor as a rotation state. A rotation detection device for a turbocharger with an electric motor according to claim 1. A sensorless permanent magnet synchronous motor driven by an inverter under vector control by a motor control device is a method for detecting a rotation state of a turbocharger with an electric motor attached to a turbocharger attached to an engine,
Based on the induced voltage induced in the stator winding of the sensorless permanent magnet synchronous motor, the rotational state when the sensorless permanent magnet synchronous motor is not driven is detected.
On the rotating surface of the rotor of the sensorless permanent magnet synchronous motor from the motor driving current of a plurality of phases supplied from the inverter to the stator winding, the power supply current supplied to the inverter, or the arm current flowing through the switch arm of the inverter Sensorless permanent magnet synchronization based on the detected drive current for each of the coordinate axes of the d axis set in the opposing direction of the S pole and N pole of the permanent magnet and the q axis orthogonal to the d axis. Estimate the rotation state when the motor is driven,
The rotation state detected based on the induced voltage at the time of non-driving is selected and output to the engine control device, while the rotation state estimated based on the motor driving current, power supply current or arm current is selected at the time of driving. And outputting the rotation to the engine control device.

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