WO2018097014A1

WO2018097014A1 - Fault detection device for rotation sensor

Info

Publication number: WO2018097014A1
Application number: PCT/JP2017/041158
Authority: WO
Inventors: 哲生森田; 中山　英明; 信介川津
Original assignee: 株式会社デンソー
Priority date: 2016-11-25
Filing date: 2017-11-15
Publication date: 2018-05-31
Also published as: JP2018085896A

Abstract

A fault detection device for a rotation sensor, said fault detection device being equipped with: a rotary electric machine (17) that is driven by rotational force input from the outside, thereby generating AC power, and that carries out power running by means of power that is input from the outside; a rotation sensor (44) that detects rotation information, which is the rotational position and/or the rotational speed of the rotary electric machine; and a voltage sensor (42) that detects AC voltage output by the rotary electric machine. This fault detection device for a rotation sensor is equipped with: a control unit (14) that, on the basis of an operation command that is input from the outside, controls the AC power generation and power running states of the rotary electric machine; and a fault detection unit (14) that, when an operation command has not been input to the control unit from the outside, detects a fault in the rotation sensor on the basis of the rotation information detected by the rotation sensor and the AC voltage detected by the voltage sensor 42.

Description

Rotation sensor abnormality detection device

Cross-reference of related applications

This application is based on Japanese Patent Application No. 2016-229224 filed on November 25, 2016, the contents of which are incorporated herein by reference.

The present disclosure relates to an abnormality detection device that detects an abnormality of a rotation sensor that detects rotation of a rotating electrical machine.

Conventionally, this type of abnormality detection apparatus includes a power converter having a bridge circuit composed of a plurality of switching elements in which diodes are connected in parallel, and a rotation angle sensor (rotation sensor) during diode rectification in which current flows through the diodes. ) Is determined (see Patent Document 1). In the device described in Patent Document 1, diode rectification is performed at the time of low output power generation by a rotating electrical machine, and it is determined whether there is an abnormality in the rotation angle sensor at the time of this low output power generation.

Japanese Patent Laying-Open No. 2015-6071

By the way, since the thing of patent document 1 performs diode rectification at the time of the low output electric power generation by a rotary electric machine, and determines abnormality of a rotation angle sensor, the opportunity to perform abnormality determination of a rotation angle sensor is limited. In particular, when large output power generation is performed by regenerative power generation in an on-vehicle rotating electrical machine, such a tendency is remarkable because other power generation is suppressed for improving the fuel efficiency of the vehicle.

The present disclosure has been made to solve these problems, and a main purpose thereof is to provide an abnormality detection device for a rotation sensor that can increase the chance of detecting an abnormality of the rotation sensor.

A first means for solving the above problem is a rotation sensor abnormality detection device,
A rotating electrical machine that is driven by a rotational force input from the outside to perform AC power generation, and that is powered by the power input from the outside;
A rotation sensor that detects rotation information that is at least one of a rotation position and a rotation speed of the rotating electrical machine;
A voltage sensor for detecting an AC voltage output by the rotating electrical machine;
Based on an operation command input from the outside, a control unit that controls the state of the AC power generation and the power running by the rotating electrical machine,
Abnormality of the rotation sensor is detected based on the rotation information detected by the rotation sensor and the AC voltage detected by the voltage sensor when the operation command is not input from the outside to the control unit. An anomaly detector;
Is provided.

According to the above configuration, the rotating electrical machine is driven by the rotational force input from the outside to perform AC power generation, and performs the power running by the power input from the outside. At this time, rotation information that is at least one of the rotation position and the rotation speed of the rotating electrical machine is detected by the rotation sensor. In addition, an AC voltage output from the rotating electrical machine is detected by the voltage sensor. And the state of AC power generation and power running by the rotating electrical machine is controlled by the control unit based on an operation command input from the outside.

Here, even when an operation command is not input from the outside to the control unit, an AC voltage may be output by the rotating electrical machine. In that case, the abnormality detection unit can detect the abnormality of the rotation sensor based on the rotation information detected by the rotation sensor and the AC voltage detected by the voltage sensor. For example, by comparing the rotation speed of the rotating electric machine calculated based on the rotation information detected by the rotation sensor with the rotation speed of the rotating electric machine calculated based on the AC voltage detected by the voltage sensor, the rotation angle sensor Abnormalities can be detected. Therefore, the abnormality detection device for the rotation sensor can increase the chances of detecting the abnormality of the rotation sensor.

In the second means, the rotating electrical machine is a field-type rotating electrical machine including an armature winding and a field winding rotated by the rotational force, and the abnormality detection unit is externally connected to the control unit. When the operation command is not input, an excitation current is passed through the field winding, and an abnormality of the rotation sensor is detected.

According to the above configuration, the field winding is rotated by the rotational force input from the outside, and the generated AC voltage is output from the armature winding. For this reason, the rotational speed of the field-type rotating electrical machine can be calculated based on the AC voltage detected by the voltage sensor. On the other hand, when no operation command is input from the outside to the control unit, AC power generation is not performed by the field-type rotating electrical machine. For this reason, there exists a possibility that the rotational speed of a field type rotary electric machine cannot be calculated based on the alternating voltage detected by the voltage sensor.

In this regard, the abnormality detection unit is in a state in which an excitation current is passed through the field winding when no operation command is input from the outside to the control unit. For this reason, AC power generation is performed by the field-type rotating electrical machine, and the abnormality detection unit detects abnormality of the rotation sensor based on the rotation information detected by the rotation sensor and the AC voltage detected by the voltage sensor. be able to. As a result, even if no operation command is input from the outside to the control unit, an abnormality of the rotation sensor can be detected.

In the third means, the rotating electrical machine is connected to the power storage device via a bridge rectifier circuit including a switching element and a diode connected in antiparallel to the switching element, and the control unit When the operation command is not input to the control unit, all the switching elements are turned off.

According to the above configuration, the rotating electrical machine is connected to the power storage device via the bridge rectifier circuit including the switching element and the diode connected in antiparallel to the switching element. For this reason, in a state where the switching element is turned on, the AC voltage detected by the voltage sensor is affected by the voltage output from the power storage device. For this reason, the abnormality detection unit may not be able to accurately detect the abnormality of the rotation sensor.

∙ In this respect, the control unit turns off all the switching elements when no operation command is input from the outside to the control unit. For this reason, the current flowing from the power storage device to the rotating electrical machine is interrupted by the switching element and the diode, and the AC voltage detected by the voltage sensor can be suppressed from being affected by the voltage output from the power storage device. Therefore, it is possible to accurately calculate the rotation speed of the rotating electrical machine based on the excitation current detected by the current sensor and the AC voltage detected by the voltage sensor, and the abnormality detection unit accurately detects the abnormality of the rotation sensor. be able to.

According to a fourth means, the abnormality detection unit flows an excitation current of a magnitude that does not output a current from the rotating electrical machine to the field winding when the operation command is not input from the outside to the control unit. An abnormality of the rotation sensor is detected.

According to the above configuration, when detecting an abnormality of the rotation sensor, the abnormality detection unit sets a state in which an excitation current having a magnitude at which no current is output from the rotating electrical machine flows through the field winding. For this reason, when no operation command is input from the outside to the control unit, it is possible to avoid output of current from the rotating electrical machine. Therefore, when no operation command is input from the outside to the control unit, the abnormality of the rotation sensor can be detected at any time, and the opportunities for detecting the abnormality of the rotation sensor can be further increased.

In the fifth means, the abnormality detection unit is excited so that a voltage lower than the voltage of the power storage device is generated by the rotating electrical machine when the operation command is not input from the outside to the control unit. Current is passed through the field winding to detect an abnormality of the rotation sensor.

When the rotating electrical machine is connected to the power storage device via a bridge rectifier circuit configured by a switching element and a diode connected in reverse parallel to the switching element, the voltage generated by the rotating electrical machine is greater than the voltage of the power storage device. Is too low, no current is output from the rotating electrical machine. In this regard, according to the above-described configuration, the abnormality detection unit sets a state in which an excitation current having a magnitude that generates a voltage lower than the voltage of the power storage device by the rotating electrical machine flows in the field winding. For this reason, the opportunity to detect abnormality of the rotation sensor can be further increased as in the fourth means.

When detecting an abnormality of the rotation sensor in a state where no current is output from the rotating electric machine, the voltage generated by the rotating electric machine is lowered, and the accuracy of detecting the abnormality of the rotation sensor may be reduced.

In this regard, in the sixth means, when the operation command is not input from the outside to the control unit and the power generation by the rotating electrical machine can be permitted, the abnormality detecting unit can perform the power storage device by the rotating electrical machine. A configuration is adopted in which an excitation current having a magnitude that generates a voltage higher than the above voltage is applied to the field winding to detect abnormality of the rotation sensor. For this reason, when the power generation by the rotating electrical machine can be permitted, a voltage higher than the voltage of the power storage device is generated by the rotating electrical machine, and the accuracy of detecting the abnormality of the rotation sensor can be improved.

Specifically, as in the seventh means, the abnormality detection unit adopts a configuration in which it is determined based on the state of the power storage device and the state of the switching element that power generation by the rotating electrical machine can be permitted. be able to. Further, as in the eighth means, the abnormality detection unit can adopt a configuration in which it is determined based on a permission signal input from the outside that power generation by the rotating electrical machine can be permitted.

In a ninth means, based on the rotation information detected by the rotation sensor, a first calculation unit for calculating a first rotation speed of the rotating electrical machine, and on the basis of the AC voltage detected by the voltage sensor. A second calculation unit that calculates a second rotation speed of the rotating electrical machine, and the abnormality detection unit is calculated by the first rotation speed calculated by the first calculation unit and the second calculation unit. An abnormality of the rotation sensor is detected based on the second rotation speed.

According to the above configuration, the first calculation unit calculates the first rotation speed of the rotating electrical machine based on the rotation information detected by the rotation sensor. Further, the second calculation unit calculates the second rotation speed of the rotating electrical machine based on the AC voltage detected by the voltage sensor.

Here, if the rotation information detected by the rotation sensor is normal, the calculated first rotation speed and second rotation speed are approximate values. On the other hand, if the rotation information detected by the rotation sensor is abnormal, the deviation between the calculated first rotation speed and the second rotation speed becomes larger than a predetermined value. For this reason, the abnormality of the rotation sensor can be detected based on the calculated first rotation speed and second rotation speed.

Specifically, like the tenth means, the second calculation unit calculates the second rotation speed based on an interval between times when the AC voltage detected by the voltage sensor is higher than a threshold value. It is possible to adopt a configuration such as. The second rotation speed of the rotating electrical machine can also be calculated based on the time from the zero cross point of the AC voltage detected by the voltage sensor to the next zero cross point.

The eleventh means includes a current sensor that detects an excitation current flowing through the field winding, and the second calculation unit includes the AC voltage detected by the voltage sensor and the excitation detected by the current sensor. The second rotation speed is calculated based on the current.

According to the above configuration, in the power generation by the field type rotating electrical machine, the induced voltage becomes higher as the magnetic field generated in the field winding is stronger and the rotation speed of the field winding is faster. That is, the magnetic field generated in the field winding, the rotation speed of the field winding, and the induced voltage of the three-phase rotating electrical machine have a correlation, and a well-known physical relational expression is established. Therefore, the second calculation unit can calculate the second rotation speed based on the excitation current detected by the current sensor and the AC voltage detected by the voltage sensor.

The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. The drawing
FIG. 1 is a circuit diagram showing a configuration of an in-vehicle rotating electrical machine system, FIG. 2 is a flowchart showing a procedure for detecting an abnormality of the rotational position sensor. FIG. 3 is a flowchart showing a procedure for determining whether the abnormality detection precondition is satisfied.

Hereinafter, an embodiment embodied as a rotating electrical machine system mounted on a vehicle will be described with reference to the drawings. In this vehicle, the engine is automatically stopped when a predetermined automatic stop condition is satisfied, and the engine is automatically restarted when a predetermined automatic restart condition is satisfied.

As shown in FIG. 1, an in-vehicle rotating electrical machine system 100 includes a rotating electrical machine unit 10, an engine ECU (Electronic Control Unit) 20, a battery 22 (corresponding to a power storage device), a second capacitor 23 (corresponding to a power storage device), an electric load. 24 etc. The rotating electrical machine unit 10 includes a rotating electrical machine 17, an inverter 13, a rotating electrical machine ECU 14, and the like. The rotating electrical machine unit 10 is a generator with a motor function, and is configured as an electromechanically integrated ISG (Integrated Starter Generator). The rotating electrical machine 17 (corresponding to a field rotating electrical machine) includes X, Y,

Z phase windings

11X, 11Y, 11Z as a three-phase armature winding, and a field winding 12. The battery 22 is a Pb battery that outputs a voltage of 12 V, for example. In addition, as the battery 22, a battery that outputs 12V using a different type of battery from the Pb battery, a battery that outputs a voltage other than 12V, and the like can be used.

The X, Y, and

Z phase windings

11X, 11Y, and 11Z are wound around a stator core (not shown) to form a stator. In the present embodiment, the first ends of the X, Y, and

Z phase windings

11X, 11Y, and 11Z are connected at a neutral point. That is, the rotating electrical machine unit 10 is Y-connected.

The field winding 12 is wound around a field pole (not shown) disposed opposite to the inner peripheral side of the stator core to constitute a rotor. By passing an exciting current through the field winding 12, the field pole is magnetized. An AC voltage is output from each phase winding 11X, 11Y, 11Z by a rotating magnetic field generated when the field pole is magnetized. In the present embodiment, the rotor is rotated (that is, driven) by a rotational force input from a crankshaft (corresponding to the outside) of the in-vehicle engine. The engine is, for example, an engine that uses gasoline as fuel, and generates driving force by combustion of the fuel. The engine is not limited to a gasoline engine, and may be a diesel engine using light oil as a fuel or an engine using other fuel.

The inverter 13 converts the AC voltage output from each phase winding 11X, 11Y, 11Z into a DC voltage. The inverter 13 converts the DC voltage supplied from the battery 22 into an AC voltage and outputs the AC voltage to the

phase windings

11X, 11Y, and 11Z. The inverter 13 (corresponding to a bridge rectifier circuit) is a bridge circuit having upper and lower arms of the same number as the number of phases of the armature winding. Specifically, the inverter 13 includes an X-phase module 13X, a Y-phase module 13Y, and a Z-phase module 13Z, and constitutes a three-phase full-wave rectifier circuit. Further, the inverter 13 constitutes a drive circuit that drives the rotating electrical machine 17 by adjusting the electric power supplied to the rotating electrical machine 17.

Each of the X, Y, and

Z phase modules

13X, 13Y, and 13Z includes an upper arm switch Sp and a lower arm switch Sn. In the present embodiment, voltage controlled semiconductor switching elements are used as the switches Sp and Sn, and specifically, N-channel MOSFETs are used. An upper arm diode Dp is connected in antiparallel to the upper arm switch Sp, and a lower arm diode Dn is connected in antiparallel to the lower arm switch Sn. In the present embodiment, body diodes (parasitic diodes) of the switches Sp and Sn are used as the diodes Dp and Dn. The diodes Dp and Dn are not limited to body diodes, and may be diodes that are separate parts from the switches Sp and Sn, for example.

The second end of the X-phase winding 11X is connected to the X terminal PX of the X-phase module 13X. The X terminal PX is connected to the low potential side terminal (source) of the upper arm switch Sp and the high potential side terminal (drain) of the lower arm switch Sn. A B terminal (corresponding to an output terminal) of the rotating electrical machine unit 10 is connected to the drain of the upper arm switch Sp, and a grounding part (ground GND) is connected to the source of the lower arm switch Sn via the E terminal of the rotating electrical machine unit 10. ) As the engine body is connected. The B terminal is a terminal connected to the positive electrode of the battery 22 and is formed in a detachable connector shape.

The second end of the Y-phase winding 11Y is connected to the Y terminal PY of the Y-phase module 13Y. A connection point between the upper arm switch Sp and the lower arm switch Sn is connected to the Y terminal PY. The B terminal is connected to the drain of the upper arm switch Sp, and the body of the engine as the ground GND is connected to the source of the lower arm switch Sn via the E terminal.

The second end of the Z-phase winding 11Z is connected to the Z terminal PZ of the Z-phase module 13Z. A connection point between the upper arm switch Sp and the lower arm switch Sn is connected to the Z terminal PZ. The B terminal is connected to the drain of the upper arm switch Sp, and the body of the engine as the ground GND is connected to the source of the lower arm switch Sn via the E terminal.

A first capacitor 15 (corresponding to a power storage device) and a Zener diode 16 are connected in parallel to a series connection body of the switches Sp and Sn constituting the

phase modules

13X, 13Y, and 13Z. A voltage sensor 41 for detecting a voltage between the high voltage side connection point P1 and the low voltage side connection point P2 of the inverter 13 is provided. A voltage sensor 42 for detecting a phase voltage (corresponding to an AC voltage) of the Y-phase winding 11Y with respect to the GND voltage is provided. The voltage sensor 42 detects not only the phase voltage of the Y-phase winding 11Y with respect to the GND voltage but also the phase voltage of the X-phase winding 11X with respect to the GND voltage or the phase voltage of the Z-phase winding 11Z with respect to the GND voltage. Also good. A current sensor 43 that detects an exciting current flowing in the field winding 12 is provided. A rotation position sensor 44 (corresponding to a rotation sensor) for detecting the rotation position (corresponding to rotation information) of the field winding 12 (that is, the rotor) is provided.

The rotating electrical machine ECU 14 is configured as a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. Detection values of the sensors are input to the rotating electrical machine ECU 14. The rotating electrical machine ECU 14 adjusts the excitation current flowing through the field winding 12 by an IC regulator (not shown) inside. Thereby, the power generation voltage (voltage of the B terminal) of the rotating electrical machine unit 10 is controlled. In addition, the rotating electrical machine ECU 14 assists the driving force of the engine by controlling the inverter 13 to drive (powering) the rotating electrical machine 17 after the vehicle starts to travel. The rotating electrical machine 17 can impart rotation to the crankshaft when the engine is started, and also has a function as a starter. The rotating electrical machine ECU 14 is connected to an engine ECU 20 that is a control device outside the rotating electrical machine unit 10 via an L terminal that is a communication terminal and a communication line.

The engine ECU 20 is configured as a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like, and controls the operating state of the engine. The rotating electrical machine ECU 14 performs bidirectional communication (for example, serial communication using the LIN protocol) with the engine ECU 20 and exchanges information with the engine ECU 20.

In the present embodiment, the rotating electrical machine ECU 14 (corresponding to the control unit) grasps the target generated voltage based on the serial communication signal (corresponding to the operation command) transmitted from the engine ECU 20, and the generated voltage (voltage of the B terminal) is determined. The PWM voltage applied to the field winding 12 is controlled so as to be the target generated voltage. Thereby, the exciting current is adjusted, and the power generation state of the rotating electrical machine unit 10 is controlled. Specifically, the rotating electrical machine ECU 14 causes the inverter 13 to perform diode rectification in a state where all of the switches Sp and Sn are turned off when the rotating electrical machine unit 10 generates power with power lower than predetermined power. On the other hand, the rotating electrical machine ECU 14 controls the switches Sp and Sn to be turned on in synchronization with the induced voltage of each phase of the rotating electrical machine 17 when the rotating electrical machine unit 10 generates power with a power higher than the predetermined power. To. The rotating electrical machine ECU 14 grasps the target torque (corresponding to the command value of the driving force) based on the serial communication signal, and the field winding 12 so that the torque generated by the rotating electrical machine 17 becomes this target torque. And the AC voltage supplied from the inverter 13 to the

phase windings

11X, 11Y, and 11Z. The rotating electrical machine 17, the rotational position sensor 44, the voltage sensor 42, and the rotating electrical machine ECU 14 constitute an abnormality detection device for the rotational position sensor 44.

The engine ECU 20 and the positive terminal of the battery 22 are connected to the B terminal via the relay 21. The engine body as the ground GND is connected to the negative terminal of the battery 22. A second capacitor 23 and an electrical load 24 are connected to the B terminal. The electric load 24 includes an electric load such as an electronically controlled brake system of a vehicle or an electric power steering. The electrical load 24 may include an air conditioner, in-vehicle audio, a headlamp, and the like. The relay 21 is turned on by turning on the ignition switch.

Next, the procedure for detecting an abnormality of the rotational position sensor 44 will be described with reference to the flowchart of FIG. This series of processing is repeatedly executed by the rotating electrical machine ECU 14 at a predetermined cycle.

First, it is determined whether or not a precondition for detecting an abnormality of the rotational position sensor 44 is satisfied (S9). The determination of establishment of this precondition will be described later. In this determination, when it is determined that the precondition for detecting the abnormality of the rotational position sensor 44 is not satisfied (S9: NO), this series of processes is temporarily ended (END).

On the other hand, when it is determined in S9 that the precondition for detecting abnormality of the rotational position sensor 44 is satisfied (S9: YES), an operation command for operating the rotating electrical machine 17 is sent from the engine ECU 20 to the rotating electrical machine ECU14. It is determined whether or not an input has been made (S10). This operation command includes a power generation command for causing the rotating electrical machine 17 to generate power and a power running command for causing the rotating electrical machine 17 to perform power running. Here, when the amount of charge of the battery is greater than a predetermined amount (for example, approximately 100%), no power generation command is input. Further, when assisting the driving force by the rotating electrical machine 17 is not performed, the powering command is not input. And when the operation command which operates the rotary electric machine 17 is not input, all the switches Sp and Sn are turned off. If it is determined in the above determination that an operation command for operating the rotating electrical machine 17 has been input (S10: YES), this series of processes is temporarily terminated (END).

On the other hand, if it is determined in S11 that an operation command for operating the rotating electrical machine 17 has not been input (S10: NO), a predetermined excitation current is passed through the field winding 12 (S11). The predetermined excitation current is set to an excitation current having a magnitude such that no current is output from the rotating electrical machine 17. For example, the exciting current is set to a magnitude that generates a voltage lower than the voltage of the first capacitor 15 (that is, the voltage detected by the voltage sensor 41) by the rotating electrical machine 17.

Subsequently, the rotational position of the field winding 12 (ie, the rotor) is detected by the rotational position sensor 44 (S12). Then, based on the rotational position detected by the rotational position sensor 44, the first rotational speed of the rotating electrical machine 17 is calculated (S13). Specifically, the first rotation speed is calculated by dividing the difference between the rotational positions detected at a plurality of time points by the time intervals at the plurality of time points.

Subsequently, the phase voltage of the rotating electrical machine 17 is detected by the voltage sensor 42 (S14), and the excitation current flowing through the field winding 12 is detected by the current sensor 43 (S15). Then, based on the phase voltage detected by the voltage sensor 42 and the exciting current detected by the current sensor 43, the second rotational speed of the rotating electrical machine 17 is calculated (S16). Specifically, in the power generation by the field-type rotating electrical machine 17, the induced voltage becomes higher as the magnetic field generated in the field winding 12 is stronger and the rotation speed of the field winding 12 is faster. That is, the strength of the magnetic field generated in the field winding 12 by the excitation current, the rotational speed of the field winding 12 and the induced voltage due to the power generation of the rotating electrical machine 17 have a correlation, and a well-known physical relational expression is To establish. Therefore, the second rotation speed of the rotating electrical machine 17 is calculated based on the phase voltage (corresponding to the induced voltage and AC voltage) detected by the voltage sensor 42 and the exciting current detected by the current sensor 43.

Subsequently, it is determined whether or not the deviation between the first rotation speed and the second rotation speed is greater than a predetermined value (S17). If the rotational position detected by the rotational position sensor 44 is normal, the calculated first rotational speed and second rotational speed are approximate values. Therefore, the predetermined value is set to a value at which the deviation between the first rotation speed and the second rotation speed is large and it can be determined that the rotation position sensor 44 is abnormal.

If it is determined in S17 that the deviation between the first rotation speed and the second rotation speed is greater than a predetermined value (S17: YES), it is determined that the rotation position sensor 44 is abnormal (S18). On the other hand, if it is determined in S17 that the deviation between the first rotation speed and the second rotation speed is not greater than the predetermined value (S17: NO), it is determined that the rotational position sensor 44 is normal (S19). . Thereafter, this series of processing is temporarily terminated (END).

The process of S13 corresponds to the process as the first calculation unit, the process of S16 corresponds to the process as the second calculation unit, and the processes of S10, S11, and S17 to S19 are the process as the abnormality detection unit. Equivalent to.

Here, the rotating electrical machine ECU 14 controls the excitation current that flows in the field winding 12 of the rotating electrical machine 17 based on the power generation command input from the engine ECU 20. The field winding 12 is rotated by the rotational force input from the crankshaft of the engine, and the generated AC voltage is output from the armature winding. For this reason, the rotating electrical machine ECU 14 can calculate the second rotational speed of the rotating electrical machine 17 based on the AC voltage detected by the voltage sensor 42. On the other hand, when no operation command is input from the engine ECU 20 to the rotating electrical machine ECU 14, no exciting current is passed through the field winding 12. For this reason, AC electric power generation is not performed by the rotary electric machine 17, and the rotary electric machine ECU 14 cannot calculate the second rotation speed of the rotary electric machine 17 based on the AC voltage detected by the voltage sensor 42. Therefore, in the abnormality detection of FIG. 2, the rotating electrical machine ECU 14 supplies an excitation current to the field winding 12 when the abnormality of the rotational position sensor 44 is detected. The case where the operation command is not input includes the case where the power generation command value is 0 and the case where the power running command value is 0.

The rotating electrical machine 17 includes a first capacitor 15, a battery 22, and a second capacitor via a bridge circuit configured by the switches Sp and Sn and diodes Dp and Dn connected in antiparallel to the switches Sp and Sn. 23 (power storage device). For this reason, in the state where each switch Sp is turned on, the phase voltage detected by the voltage sensor 42 is affected by the voltage output from the power storage device. For this reason, the second rotation speed calculated based on the phase voltage detected by the voltage sensor 42 and the excitation current detected by the current sensor 43 does not become an accurate rotation speed. As a result, the rotating electrical machine ECU 14 that detects abnormality of the rotation sensor based on the first rotation speed and the second rotation speed cannot accurately detect the abnormality of the rotation sensor. Therefore, in the abnormality detection of FIG. 2, the rotating electrical machine ECU 14 detects the abnormality of the rotational position sensor 44 when all the switches Sp and Sn are turned off.

Next, with reference to FIG. 3, a description will be given of the establishment of a precondition for detecting an abnormality of the rotational position sensor 44. This series of processing is repeatedly executed by the rotating electrical machine ECU 14 at a predetermined cycle.

First, it is determined whether or not the rotating electrical machine 17 has just been started (S21). In this determination, when it is determined that the rotating electrical machine 17 is not immediately after starting (S21: NO), it is determined whether or not it is the first power generation command after starting the rotating electrical machine 17 (S22). In this determination, when it is determined that it is not the first power generation command after starting the rotating electrical machine 17 (S22: NO), it is determined whether it is immediately before the engine is automatically stopped (S23). For example, when the engine automatic stop condition is satisfied, it is determined that the engine is immediately before the automatic stop. If it is determined that it is not immediately before the engine is automatically stopped (S23: NO), it is determined whether or not a predetermined time has elapsed since the abnormality detection process for the rotational position sensor 44 was executed last time (S24). The predetermined time is set so that the abnormality detection process is performed a plurality of times during one trip of the vehicle. In this determination, if it is determined that the predetermined time has not elapsed since the last time the abnormality detection process of the rotational position sensor 44 was executed (S24: NO), the precondition for detecting the abnormality of the rotational position sensor 44 is satisfied. It is determined that it is not present (S25). Then, this series of processing is temporarily ended (END).

Moreover, when it determines with it being immediately after starting of the rotary electric machine 17 (S21: YES), when it determines with it being the first electric power generation command after starting of the rotary electric machine 17 (S22: YES), it is just before an automatic stop of an engine. (S23: YES), and when it is determined that a predetermined time has elapsed since the last time the abnormality detection process of the rotational position sensor 44 was executed (S24: YES), the rotor of the rotating electrical machine 17 rotates. It is determined whether or not (S26). For example, when the crankshaft of the engine is rotating, it is determined that the rotor of the rotating electrical machine 17 is rotating. In this determination, when it is determined that the rotor of the rotating electrical machine 17 is not rotating (S26: NO), the process proceeds to S25. On the other hand, in this determination, when it is determined that the rotor of the rotating electrical machine 17 is rotating (S26: YES), it is determined that a precondition for detecting abnormality of the rotational position sensor 44 is satisfied (S27). Then, this series of processing is temporarily ended (END).

The embodiment described above has the following advantages.

If the rotational position detected by the rotational position sensor 44 is normal, the calculated first rotational speed and second rotational speed are approximate values. On the other hand, if the rotational position detected by the rotational position sensor 44 is abnormal, the deviation between the calculated first rotational speed and second rotational speed is greater than a predetermined value. For this reason, the abnormality of the rotational position sensor 44 can be detected based on the calculated first rotational speed and second rotational speed. Therefore, the abnormality of the rotational position sensor 44 can be detected without requiring information from rotational position sensors other than the rotational position sensor 44.

When the abnormality of the rotational position sensor 44 is detected, the rotating electrical machine ECU 14 sets an excitation current to flow in the field winding 12 when no operation command is input from the engine ECU 20 to the rotating electrical machine ECU 14. For this reason, AC power generation is performed by the rotating electrical machine 17, and the second rotational speed of the rotating electrical machine 17 can be calculated based on the AC voltage detected by the voltage sensor 42. Therefore, the rotating electrical machine ECU 14 can detect an abnormality in the rotational position sensor 44 based on the calculated first rotational speed and the calculated second rotational speed. As a result, even if no operation command is input from the engine ECU 20 to the rotating electrical machine ECU 14, an abnormality of the rotational position sensor 44 can be detected. Therefore, the rotating electrical machine ECU 14 can increase the chances of detecting an abnormality in the rotational position sensor 44.

The rotating electrical machine ECU 14 detects an abnormality of the rotational position sensor 44 when the switches Sp and Sn are all turned off. For this reason, the current flowing from the power storage device to the rotating electrical machine 17 is interrupted by the switch Sp and the diode Dp, and the phase voltage detected by the voltage sensor 42 can be suppressed from being affected by the voltage output from the power storage device. . Therefore, the second rotational speed can be accurately calculated based on the detected excitation current and the detected phase voltage, and thus the rotating electrical machine ECU 14 can accurately detect the abnormality of the rotational position sensor 44.

When the charge amount of the battery 22 is larger than the predetermined amount, it is less necessary to generate power by the rotating electrical machine 17 to charge the battery 22. Further, when power is generated by the rotating electrical machine 17, the load on the crankshaft increases. For this reason, when the charge amount of the battery 22 is larger than the predetermined amount, a power generation command is not input from the engine ECU 20 to the rotary electric machine ECU 14 in order to suppress a load caused by the electric power generation of the rotary electric machine 17. According to the present embodiment, in such a case, an abnormality of the rotational position sensor 44 can be detected.

When the rotating electrical machine ECU 14 detects an abnormality in the rotational position sensor 44, the rotating electrical machine ECU 14 is in a state in which an excitation current having a magnitude at which no current is output from the rotating electrical machine 17 flows through the field winding 12. Specifically, the rotating electrical machine ECU 14 is in a state where an excitation current having a magnitude that causes the rotating electrical machine 17 to generate a voltage lower than the voltage of the first capacitor 15 (battery 22) flows in the field winding 12. For this reason, when no operation command is input from the engine ECU 20 (external) to the rotating electrical machine ECU 14, it is possible to avoid the output of current from the rotating electrical machine 17. Therefore, when no operation command is input to the rotating electrical machine ECU 14 from the outside, the abnormality of the rotational position sensor 44 can be detected at any time, and the opportunities for detecting the abnormality of the rotational position sensor 44 can be further increased.

It should be noted that the above embodiment can be modified as follows.

The rotating electrical machine unit 10 may not be an electromechanical integrated ISG, and the rotating electrical machine 17 and the inverter 13 may be separated.

When it is determined that the ratio between the first rotation speed and the second rotation speed is outside the predetermined range, it may be determined that the rotation position sensor 44 is abnormal. Even with such a configuration, it can be determined that the difference between the first rotation speed and the second rotation speed is large.

When detecting an abnormality of the rotational position sensor 44 in a state where no current is output from the rotating electrical machine 17, the voltage generated by the rotating electrical machine 17 becomes low, and the accuracy of detecting the abnormality of the rotational position sensor 44 may be reduced. .

Therefore, the rotary electric machine ECU 14 receives the voltage of the first capacitor 15 by the rotary electric machine 17 (that is, by the voltage sensor 41) when no operation command is input from the outside to the rotary electric machine ECU 14 and power generation by the rotary electric machine 17 can be permitted. It is also possible to detect an abnormality in the rotational position sensor 44 by causing an excitation current of a magnitude that generates a voltage higher than (the detected voltage) to flow in the field winding 12.

Specifically, the rotating electrical machine ECU 14 can determine that power generation by the rotating electrical machine 17 can be permitted based on the state of the battery 22 (corresponding to the power storage device) and the states of the switches Sp and Sn. For example, when the state of charge of the battery 22 is not a fully charged state (a state larger than a predetermined amount) and the switches Sp and Sn are all off, it can be determined that power generation by the rotating electrical machine 17 can be permitted. Further, such determination is performed by the engine ECU 20 (corresponding to the outside), and the rotating electrical machine ECU 14 can also determine based on the permission signal input from the engine ECU 20 that the power generation by the rotating electrical machine 17 can be permitted.

According to such a configuration, when the power generation by the rotating electrical machine 17 can be permitted, a voltage higher than the voltage of the first capacitor 15 (battery 22) is generated by the rotating electrical machine 17 and the abnormality of the rotational position sensor 44 is detected. The accuracy of detecting can be improved.

The rotating electrical machine 17 is connected to the power storage device via a bridge circuit composed of the switches Sp and Sn and the diodes Dp and Dn connected in antiparallel to the switches Sp and Sn. For this reason, even if all the switches Sp and Sn are all turned off, an exciting current is passed through the field winding 12 and the AC voltage output from the rotating electrical machine 17 is rectified by the diodes Dp and Dn to generate power. it can. Therefore, the rotating electrical machine ECU 14 (corresponding to the abnormality detection unit) causes the exciting current to flow through the field winding 12 in a state where all the switches Sp and Sn are turned off, when all the switches Sp and Sn are turned off. When an operation command (diode rectification command) is input from the engine ECU 20, an abnormality of the rotational position sensor 44 can also be detected. According to such a configuration, an abnormality of the rotational position sensor 44 can be detected when power generation is performed by diode rectification. In that case, in order to increase the chance of detecting the abnormality of the rotational position sensor 44, the predetermined power for switching between diode rectification and synchronous rectification by the inverter 13 may be increased.

The rotating electrical machine ECU 14 (corresponding to the second calculating unit) is configured so that the field winding 12 (the rotating electrical machine 17 is based on the time from the zero cross point at which the AC voltage detected by the voltage sensor 42 becomes zero to the next zero cross point. It is also possible to calculate the second rotational speed of the rotor. Further, the rotating electrical machine ECU 14 determines the interval between periods when the AC voltage detected by the voltage sensor 42 is higher than the threshold, or the length of the period during which the detected AC voltage is higher than the threshold (and thus the detected AC voltage). The second rotation speed can also be calculated based on the period or the frequency. As this threshold value, for example, a voltage higher than the GND voltage and lower than the voltage of the first capacitor 15 (battery 22) can be set. In addition, even if the AC voltage detected by the voltage sensor 42 is fluctuating, the rotation position sensor 44 can be detected to be abnormal when the detection value by the rotation position sensor 44 has not fluctuated. .

When the rotating electrical machine unit 10 is not connected to the power storage device or other power source, the abnormality of the rotational position sensor 44 can be detected not only when all the switches Sp and Sn are turned off. For example, the rotating electrical machine ECU 14 can also detect an abnormality in the rotational position sensor 44 when the rotating electrical machine 17 is generating power based on an operation command input from the engine ECU 20.

The rotating electrical machine unit 10 may include a rotation speed sensor that detects the rotation speed of the field winding 12 (rotor) instead of or together with the rotation position sensor 44. Then, the rotating electrical machine ECU 14 performs the first rotation of the field winding 12 based on at least one of the rotation position detected by the rotation position sensor 44 and the rotation speed detected by the rotation speed sensor (corresponding to rotation information). The speed may be calculated.

-As the rotating electrical machine 17, a rotating electrical machine having a multi-phase multiple winding can be adopted. As the rotating electrical machine 17, instead of the field winding 12, a rotating machine having a magnet in the rotor can be adopted. In that case, the control of the inverter 13 may be changed according to the configuration of the rotating electrical machine 17. The configuration of the inverter 13 is also configured such that the entire X, Y,

Z phase modules

13X, 13Y, 13Z are integrated modules, or two of the X, Y,

Z phase modules

13X, 13Y, 13Z are integrated modules. Or may be configured as Further, as the rotating electrical machine 17, an MG (MotoreratorGenerator) that generates a driving force capable of driving the vehicle may be employed. Alternatively, the rotating electrical machine 17 may be driven by an external force (rotational force) other than the engine to generate AC power.

Although the present disclosure has been described based on the embodiments, it is understood that the present disclosure is not limited to the embodiments and structures. The present disclosure includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, as well as other combinations and forms including only one element, more or less, are within the scope and spirit of the present disclosure.

Claims

A rotating electrical machine (17) that is driven by a rotational force input from the outside to perform AC power generation, and that is powered by the power input from the outside;
A rotation sensor (44) for detecting rotation information which is at least one of a rotation position and a rotation speed of the rotating electrical machine;
A voltage sensor (42) for detecting an AC voltage output by the rotating electrical machine;
A control unit (14) for controlling the state of the AC power generation and the power running by the rotating electrical machine based on an operation command input from the outside;
Abnormality of the rotation sensor is detected based on the rotation information detected by the rotation sensor and the AC voltage detected by the voltage sensor when the operation command is not input from the outside to the control unit. An anomaly detector (14);
An abnormality detection device for a rotation sensor comprising:
The rotating electrical machine is a field rotating electrical machine including an armature winding (11X, 11Y, 11Z) and a field winding (12) rotated by the rotational force,
The abnormality detection unit detects an abnormality of the rotation sensor by setting an excitation current to flow in the field winding when the operation command is not input from the outside to the control unit. Rotation sensor abnormality detection device.
The rotating electrical machine is connected to the power storage device via a bridge rectifier circuit (13) including switching elements (Sp, Sn) and diodes (Dp, Dn) connected in antiparallel to the switching elements. ,
The rotation sensor abnormality detection device according to claim 2, wherein the control unit turns off all the switching elements when the operation command is not input from the outside to the control unit.
The abnormality detection unit is configured to cause an excitation current of a magnitude that does not output current from the rotating electrical machine to flow in the field winding when the operation command is not input from the outside to the control unit, and the rotation The abnormality detection device for a rotation sensor according to claim 3, wherein abnormality of the sensor is detected.
The abnormality detection unit generates an excitation current having a magnitude such that a voltage lower than the voltage of the power storage device is generated by the rotating electrical machine when the operation command is not input from the outside to the control unit. The abnormality detection device for a rotation sensor according to claim 3, wherein an abnormality of the rotation sensor is detected in a state of flowing through a line.
The abnormality detection unit generates a voltage higher than the voltage of the power storage device by the rotating electrical machine when the operation command is not input from the outside to the control unit and power generation by the rotating electrical machine can be permitted. The rotation sensor abnormality detection device according to claim 3, wherein an abnormality of the rotation sensor is detected in a state where an excitation current of a certain magnitude flows in the field winding.
The abnormality detection device for a rotation sensor according to claim 6, wherein the abnormality detection unit determines that power generation by the rotating electrical machine can be permitted based on a state of the power storage device and a state of the switching element.
The abnormality detection device for a rotation sensor according to claim 6, wherein the abnormality detection unit determines that power generation by the rotating electrical machine can be permitted based on a permission signal input from the outside.
A first calculator (14) that calculates a first rotation speed of the rotating electrical machine based on the rotation information detected by the rotation sensor;
A second calculator (14) for calculating a second rotational speed of the rotating electrical machine based on the AC voltage detected by the voltage sensor;
With
The abnormality detection unit detects an abnormality of the rotation sensor based on the first rotation speed calculated by the first calculation unit and the second rotation speed calculated by the second calculation unit. The abnormality detection device for a rotation sensor according to any one of 1 to 8.
The abnormality detection device for a rotation sensor according to claim 9, wherein the second calculation unit calculates the second rotation speed based on an interval between timings when the AC voltage detected by the voltage sensor becomes higher than a threshold value. .
A current sensor (43) for detecting an exciting current flowing in the field winding;
The abnormality of the rotation sensor according to claim 9, wherein the second calculation unit calculates the second rotation speed based on the AC voltage detected by the voltage sensor and the excitation current detected by the current sensor. Detection device.