JP2017202778A - Control device for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for a rotary electric machine, which is able to perform assistance while ensuring an operating voltage for an electric load such as a safety device.SOLUTION: A control device is applied in a vehicle including: an engine (101); a rotary electric machine (17) that is able to assist a driving force for the engine; a drive circuit (13) that drives the rotary electric machine by adjusting power supplied to the rotary electric machine; an electric load (24) that regards a predetermined voltage or above as an operating voltage; and a battery (22), the control device controlling the rotary electric machine. The control device comprises: an assist control unit (14) that controls the drive circuit after travel of the vehicle is started, drives the rotary electric machine, and assists a driving force for the engine; voltage acquisition units (41, 41A) that acquire a voltage of the battery; and voltage control units (14, 20) that continuously drive the rotary electric machine by controlling the drive circuit via the assist control unit such that, during assistance by the assist control unit, a voltage acquired by each voltage acquisition unit becomes equal to or higher than a predetermined voltage.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a control device that controls a rotating electrical machine.

  2. Description of the Related Art Conventionally, there is one that includes a torque assist control unit that assists the driving force of a driving force source that drives a motor generator (rotary electric machine) after driving of the vehicle to drive the vehicle (see Patent Document 1). In the thing of this patent document 1, when it detects that the electrical connection of a battery is cut | disconnected, the operation | movement of a torque assist control part is prohibited.

JP 2013-256174 A

  By the way, not only when the electrical connection of the battery is disconnected, but when the battery voltage drops due to the high power consumed by the motor generator at the time of assist, safety devices such as electronically controlled brake systems and electric power steering Performance may be reduced. On the other hand, if the battery voltage is likely to be lower than the operating voltage of the safety device, prohibiting the assist will reduce the acceleration performance of the vehicle.

  The present invention has been made to solve the above-mentioned problems, and a main object of the present invention is to provide a control device for a rotating electrical machine capable of executing an assist while securing an operating voltage of an electrical load such as a safety device. There is to do.

  In order to solve the above problems, the present invention employs the following means.

  The first means includes an engine (101) that generates a driving force, a rotating electric machine (17) that can assist the driving force of the engine, and an electric power supplied to the rotating electric machine to adjust the rotating electric machine. Applied to a vehicle comprising: a drive circuit (13) for driving; an electric load (24) whose operating voltage is equal to or higher than a predetermined voltage; and a battery (22) for supplying power to the drive circuit and the electric load, An assist control unit (14) for controlling the rotating electrical machine, wherein the driving circuit is driven to drive the rotating electrical machine after the vehicle starts to travel to assist the driving force of the engine, and the battery The voltage acquired by the voltage acquisition unit (41, 41A) and the voltage acquisition unit during execution of the assist by the assist control unit is equal to or higher than the predetermined voltage. As such, it characterized by comprising the voltage control unit for the rotating electric machine continuously driven and (14, 20), by controlling the drive circuit by the assist control unit.

  According to the above configuration, the vehicle includes the engine that generates the driving force and the rotating electrical machine that can assist the driving force of the engine. In addition, power is supplied from the battery to a drive circuit that drives the rotating electrical machine by adjusting the power supplied to the rotating electrical machine, and to an electric load that has a predetermined voltage or higher as an operating voltage. The operating voltage is a voltage at which the electrical load can exhibit the specified performance, such as a guaranteed voltage or a rated voltage of the electrical load.

  Here, the assist control unit assists the driving force of the engine by controlling the drive circuit after driving of the vehicle to drive the rotating electrical machine. At this time, if a large amount of electric power is consumed by driving the rotating electrical machine, the voltage of the battery decreases to become less than a predetermined voltage, and there is a possibility that the operating voltage of the electric load cannot be secured. Therefore, the voltage control unit continues the rotating electrical machine by controlling the drive circuit by the assist control unit so that the battery voltage acquired by the voltage acquisition unit becomes equal to or higher than a predetermined voltage during the execution of the assist by the assist control unit. Drive. Therefore, the assist can be continuously executed while ensuring the operating voltage of the electric load.

  In the second means, the voltage control unit, when the assist is performed by the assist control unit, when the voltage acquired by the voltage acquisition unit is equal to or higher than a lower limit voltage set higher than the predetermined voltage. The control of the drive circuit by the assist control unit is not limited.

  According to the above configuration, if the voltage acquired by the voltage acquisition unit is equal to or higher than the lower limit voltage set higher than the predetermined voltage during execution of the assist by the assist control unit, the drive circuit is controlled by the assist control unit. Not limited. For this reason, when the voltage of a battery is more than a lower limit voltage, normal assistance can be performed.

  In the third means, when the voltage control unit decreases the lower limit voltage set higher than the predetermined voltage during execution of the assist by the assist control unit, the voltage acquired by the voltage acquisition unit. The drive circuit is controlled by the assist control unit so that the rotating electrical machine is continuously driven so as to be maintained at the lower limit voltage.

  According to the above configuration, the assist control is performed so that, when the assist control unit performs the assist, the voltage acquired by the voltage acquisition unit is maintained at the lower limit voltage when the voltage decreases to a lower limit voltage set higher than a predetermined voltage. The drive circuit is controlled by the unit, and the rotating electrical machine is continuously driven. For this reason, even when the battery voltage decreases during the execution of the assist, the battery voltage can be maintained at the lower limit voltage set higher than the predetermined voltage. As a result, it is possible to stabilize the operation of the electric load having an operating voltage equal to or higher than a predetermined voltage.

  In the fourth means, the voltage control unit becomes equal to or higher than the predetermined voltage when the voltage acquired by the voltage acquisition unit becomes less than the predetermined voltage during execution of the assist by the assist control unit. As described above, the rotating electrical machine is continuously driven by controlling the driving circuit by the assist control unit.

  According to the above configuration, the drive circuit is controlled by the assist control unit so that when the voltage acquired by the voltage acquisition unit becomes less than the predetermined voltage during execution of the assist by the assist control unit, the voltage is higher than the predetermined voltage. The rotating electrical machine is continuously driven. For this reason, the assist can be continuously executed while the operating voltage of the electric load is generally secured by the simple control that causes the voltage of the battery to become equal to or higher than the predetermined voltage when the voltage becomes lower than the predetermined voltage.

  In the fifth means, when the voltage control unit predicts that the voltage acquired by the voltage acquisition unit is less than the predetermined voltage during execution of the assist by the assist control unit, the voltage control unit reduces the voltage to less than the predetermined voltage. In order to prevent this, the assist control unit controls the drive circuit to continuously drive the rotating electrical machine.

  According to the above configuration, when the assist control unit performs the assist, the assist control unit causes the drive circuit to prevent the voltage acquired by the voltage acquisition unit from being less than the predetermined voltage when it is predicted that the voltage will be less than the predetermined voltage. Is controlled and the rotating electrical machine is continuously driven. For this reason, even when the battery voltage rapidly decreases during the execution of the assist, it is possible to predict the battery voltage so that it does not become lower than the predetermined voltage.

  In a sixth means, the vehicle includes an engine ECU (20) that controls an operating state of the engine, and a rotating electrical machine ECU (14) that controls a driving state of the rotating electrical machine, the assist control unit and the The voltage control unit is configured by the rotating electrical machine ECU, and the rotating electrical machine ECU inputs a command value of a driving force generated by the rotating electrical machine from the engine ECU, and the voltage acquisition unit performs the assist during execution of the assist. Based on the command value, the drive circuit is controlled to continuously drive the rotating electrical machine so that the acquired voltage is equal to or higher than the predetermined voltage.

  According to the above configuration, the assist control unit and the voltage control unit are configured by the rotating electrical machine ECU. The rotating electrical machine ECU inputs the command value of the driving force generated by the rotating electrical machine from the engine ECU, and sets the command value so that the voltage acquired by the voltage acquiring unit is equal to or higher than the predetermined voltage during the execution of the assist. Based on this, the drive circuit is controlled to continuously drive the rotating electrical machine. For this reason, it is not necessary to change the control of the engine ECU, and the assist can be continuously executed while ensuring the operating voltage of the electric load by the control of the rotating electrical machine ECU.

  In a seventh means, the vehicle includes an engine ECU (20) that controls an operating state of the engine and a rotating electrical machine ECU (14) that controls a driving state of the rotating electrical machine, and the assist control unit includes: The rotating electrical machine ECU is configured, the voltage control unit is configured by the engine ECU, and the rotating electrical machine ECU inputs a command value of a driving force generated by the rotating electrical machine from the engine ECU, and the vehicle travels After the start, the drive circuit is controlled based on the command value to drive the rotating electrical machine to assist the driving force of the engine, and the engine ECU performs the assist during the execution of the assist by the rotating electrical machine ECU. The command value is controlled so that the voltage acquired by the voltage acquisition unit is equal to or higher than the predetermined voltage, and the drive is performed by the rotating electrical machine ECU. To control the road said to the rotary electric machine continuously driven by.

  According to the above configuration, the assist control unit is configured by the rotating electrical machine ECU. Then, the rotating electrical machine ECU inputs a command value of the driving force to be generated from the engine ECU to the rotating electrical machine, controls the drive circuit based on the command value after driving of the vehicle, drives the rotating electrical machine, and drives the engine Assist force. The voltage control unit is configured by an engine ECU. Then, the engine ECU controls the command value so that the voltage acquired by the voltage acquisition unit is equal to or higher than a predetermined voltage during the execution of the assist by the rotating electrical machine ECU, and rotates the rotating electrical machine ECU by controlling the drive circuit. Continue driving the electric machine. For this reason, it is not necessary to change the control of the rotating electrical machine ECU, and the assist can be continuously executed while securing the operating voltage of the electric load by the control of the engine ECU.

The circuit diagram which shows the structure of a vehicle-mounted rotary electric machine system. Sectional drawing of a rotary electric machine unit. The flowchart which shows the procedure of assist control. The flowchart which shows the example of a change of the procedure of assist control. The flowchart which shows the other example of a change of the procedure of assist control. The flowchart which shows the other example of a change of the procedure of assist control.

  Hereinafter, an embodiment embodied as a rotating electrical machine system mounted on a vehicle will be described with reference to the drawings.

  As shown in FIG. 1, the in-vehicle rotating electrical machine system 100 includes a rotating electrical machine unit 10, an engine ECU (Electronic Control Unit) 20, a battery 22, a second capacitor 23, an electric load 24, and the like. 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 includes X, Y and 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 rotates by obtaining rotational power from the crankshaft of the in-vehicle engine 101 (the body of the in-vehicle engine is schematically shown in FIG. 1). The engine 101 is, for example, an engine that uses gasoline as fuel, and generates driving force by the combustion of fuel. The engine 101 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 rectifier circuit and a drive 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, the body 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.

  A 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 body of the engine 101 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 101 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 101 as the ground GND is connected to the source of the lower arm switch Sn via the E terminal. A structure for connecting the source (low-pressure side connection point P2) of each lower arm switch Sn to the body of the engine 101 will be described later.

  A first capacitor 15 and a Zener diode 16 are connected in parallel to the series connection body of the switches Sp and Sn constituting the phase modules 13X, 13Y, and 13Z. A voltage sensor 41 (corresponding to a voltage detection unit and a voltage acquisition unit) that detects a voltage between the high-voltage side connection point P1 and the low-voltage side connection point P2 of the inverter 13 is provided. The wiring 18 connecting the high voltage side connection point P1 and the B terminal corresponds to the first conductive member, and the conductive members connecting the low voltage side connection point P2 to the body of the engine 101 are the second conductive member. Equivalent to. The wiring 18 includes a bus bar formed of a conductive metal in a bar shape, and a pattern wiring formed of a conductive metal film on a control board on which the rotating electrical machine ECU 14 is mounted.

  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. 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. The rotating electrical machine ECU 14 assists the driving force of the engine 101 by controlling the inverter 13 to drive 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 101 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 101. 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 grasps the target generated voltage based on the serial communication signal transmitted from the engine ECU 20, and the field winding so that the generated voltage (the voltage at the B terminal) becomes the target generated voltage. The PWM voltage applied to 12 is controlled. Thereby, the exciting current is adjusted, and the power generation state of the rotating electrical machine unit 10 is controlled. 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 engine ECU 20 and the positive terminal of the battery 22 are connected to the B terminal via the relay 21. The body of the engine 101 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 whose operating voltage is a predetermined voltage or higher, such as an electronically controlled brake system of a vehicle or an electric power steering. The operating voltage is a voltage at which the electrical load can exhibit the specified performance, such as a guaranteed voltage or a rated voltage of the electrical load. 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 mechanical structure of the rotating electrical machine unit 10 will be described with reference to the cross-sectional view of FIG.

  In the rotating electrical machine unit 10, the front body 52 and the rear body 53 are connected by a fastening bolt 54 in a state where the stator 55 of the rotating electrical machine 17 is sandwiched in the rotational axis direction. The front body 52 and the rear body 53 are formed of a material having excellent thermal conductivity and conductivity, such as an aluminum alloy. The configuration including the front body 52 and the rear body 53 corresponds to a housing. The stator 55 includes a stator core 55a fixed to the front body 52 and the rear body 53, and the phase windings 11X, 11Y, and 11Z wound around the stator core 55a.

  On the other hand, a rotating shaft 56 is rotatably attached to the front body 52 and the rear body 53 by bearings 57a and 57b. A rotor 58 is fixed to the rotating shaft 56. The rotating shaft 56 is press-fitted into a pair of rotor cores 58 a and 58 b that form the rotor 58. The rotor cores 58a and 58b are coupled to each other with the field winding 12 interposed therebetween. The rotor 58 faces radially inward with respect to the stator 55, and a slight gap is formed between the outer peripheral surfaces of the rotor cores 58a and 58b and the inner peripheral surface of the stator core 55a.

  Further, a pulley 60 is attached to the front end portion (left end portion in FIG. 2) of the rotation shaft 56 so as to be integrally rotatable. A belt (not shown) that transmits driving force from the engine 101 is stretched around the pulley 60.

  A pair of slip rings 56 a and 56 b are formed at the rear end portion (right end portion in FIG. 2) of the rotation shaft 56 over the entire circumference of the rotation shaft 56. A wire harness 58d of a rotor 58 is connected to each of the slip rings 56a and 56b, and the slip rings 56a and 56b are connected to the above-described field winding 12 by the wire harness 58d.

  A pair of power supply brushes 61a and 61b are in contact with the slip rings 56a and 56b. The power supply brushes 61a and 61b are attached to the rear body 53 via a brush holder 62 formed of a synthetic resin material. The power supply brushes 61 a and 61 b are connected to the battery 22. The battery 22 is electrically connected to the field winding 12 via power supply brushes 61a and 61b, slip rings 56a and 56b, and a wire harness 58d. The power supply brushes 61 a and 61 b are in sliding contact with the slip rings 56 a and 56 b as the rotor 58 rotates, and supply power to the field winding 12.

  Further, a sensor magnetic pole 56c is formed at the rear end portion of the rotating shaft 56, and the sensor magnetic pole 56c has a plurality of magnetic poles. The sensor magnetic pole 56c is held on the rotating shaft 56 via a magnet holder 56d formed of a nonmagnetic material.

  A heat radiating plate 63 (corresponding to a second member and a heat radiating member) is disposed on the rear end side (right side in FIG. 2) of the rotating shaft 56 with respect to the rear body 53. The heat radiating plate 63 is integrally formed of a material having excellent heat conductivity and conductivity, such as an aluminum alloy, and is formed in a substantially flat plate shape. The heat radiating plate 63 has a flat bottom surface portion 63a extending in the radial direction, and faces the front so that one surface 63c (hereinafter referred to as the front surface 63c) of the bottom surface portion 63a faces the rear end portion of the rear body 53. The other surface 63b (hereinafter referred to as the rear surface 63b) is attached to the outer peripheral surface of the rear body 53 so as to face rearward. The heat radiating plate 63 has a substantially C shape so that the rotation shaft 56 penetrates through the central portion, and surrounds the rotation shaft 56 and the power supply brushes 61a and 61b in the radially outward direction.

  The inverter 13 is attached to the rear surface 63b of the bottom surface portion 63a. On the rear surface 63b of the heat radiating plate 63, the inverter 13 is attached in a form divided into the phase modules 13X, 13Y, 13Z.

  A substrate case 65 is attached to the rear surface 63 b of the heat radiating plate 63. The substrate case 65 is integrally formed in a container shape with a synthetic resin material. A control board 66 is attached in the board case 65 so as to be located rearward. In other words, the control board 66 is disposed on the rear surface 63 b side of the heat radiating plate 63 through the board case 65. The control board 66 is formed by providing pattern wiring (not shown) with a copper foil or the like on a base material impregnated with an insulating resin. On the control board 66, a plurality of electronic elements including the rotating electrical machine ECU 14 shown in FIG.

  A rotation sensor 67 is provided on the control board 66. The rotation sensor 67 is formed by a magnetoelectric conversion element such as a Hall IC and faces the sensor magnetic pole 56c described above in the rotation axis direction. The rotation sensor 67 detects a change in magnetic flux due to rotation of the rotation shaft 56 and detects a rotation angle, a rotation speed, a rotation acceleration, and the like of the rotor 58.

  A rear end cover 68 is attached to the rear end surface of the rear body 53. The rear end cover 68 is arranged at a position sandwiching the control board 66 together with the heat radiating plate 63. The rear end cover 68 is formed of a synthetic resin material in a container shape, and includes a flat portion 68a facing the control board 66, and a cylindrical portion 68b connected to the flat portion 68a and extending forward at the outer peripheral portion. . The rear end cover 68 is attached to the rear body 53 so as to cover the control board 66, the slip rings 56a and 56b, and the power supply brushes 61a and 61b. Further, the front end of the cylindrical portion 68b and the rear end surface of the rear body 53 are opposed to each other in the rotation axis direction.

  Here, a structure for connecting the source (low-pressure side connection point P2) of each lower arm switch Sn shown in FIG. 1 to the body of the engine 101 will be described.

  As described above, the inverter 13 is attached to the bottom surface portion 63 b of the heat radiating plate 63. The source of each lower arm switch Sn is electrically connected to the heat sink 63. The heat radiating plate 63 is electrically connected to the rear body 53 and the front body 52. The rear body 53 and the front body 52 are electrically connected to the body of the engine 101 via a steel connecting member 69.

  The electrical resistance of the second conductive member from the low-pressure side connection point P2 to the body of the engine 101 is measured in advance. Further, the electrical resistance of the first conductive member from the high voltage side connection point P1 to the B terminal is measured in advance.

[Assist control]
Next, assist control for assisting the driving force of the engine 101 by driving the rotating electrical machine 17 after the vehicle starts running will be described. This assist control is executed by the rotating electrical machine ECU 14 (corresponding to an assist control unit and a voltage control unit).

  The assist control unit assists the driving force of the engine 101 by controlling the inverter 13 to drive the rotating electrical machine 17 after the vehicle starts to travel. At this time, when a large amount of power is consumed by driving the rotating electrical machine 17, the voltage of the battery 22 decreases. The electric load 24 includes an electric load having an operating voltage equal to or higher than a predetermined voltage. For this reason, the voltage of the battery 22 decreases and becomes less than a predetermined voltage, and there is a possibility that the operating voltage of the electric load 24 cannot be secured.

  Therefore, in the present embodiment, the voltage control unit is configured so that the voltage (corresponding to the voltage of the battery 22) detected by the voltage sensor 41 is equal to or higher than a predetermined voltage during the execution of the assist by the assist control unit. Thus, the inverter 13 is controlled to drive the rotating electrical machine 17 continuously. That is, the rotating electrical machine ECU 14 inputs a target torque to be generated by the rotating electrical machine 17 from the engine ECU 20, and based on the target torque so that the voltage detected by the voltage sensor 41 becomes equal to or higher than a predetermined voltage during the execution of the assist. The inverter 13 is controlled to continuously drive the rotating electrical machine 17.

  Specifically, the voltage control unit controls the inverter 13 by the assist control unit when the voltage detected by the voltage sensor 41 is equal to or higher than a lower limit voltage set higher than a predetermined voltage during the execution of the assist by the assist control unit. Do not limit. Then, the voltage control unit causes the assist control unit to control the inverter 13 to continuously drive the rotating electrical machine 17 so that the voltage detected by the voltage sensor 41 is maintained at the lower limit voltage when the voltage is decreased to the lower limit voltage. Specifically, the inverter 13 may be feedback controlled so that the voltage detected by the voltage sensor 41 becomes the lower limit voltage.

  FIG. 3 is a flowchart showing a procedure of the assist control. The rotating electrical machine ECU 14 determines whether or not the voltage detected by the voltage sensor 41 is equal to or higher than the lower limit voltage (S11). When the rotating electrical machine ECU 14 determines that the detected voltage is equal to or higher than the lower limit voltage (S11: YES), the rotating electrical machine 17 drives the rotating electrical machine 17 to generate the target torque (S12). On the other hand, when the rotating electrical machine ECU 14 determines that the detected voltage is not equal to or higher than the lower limit voltage (S11: NO), the rotating electrical machine 17 is driven so that the detected voltage becomes the lower limit voltage (S13). When the rotating electrical machine 17 is driven so that the detected voltage becomes the lower limit voltage, the torque generated by the rotating electrical machine 17 is equal to or less than the target torque.

  The assist control has the following advantages.

  The assist can be continuously executed while the operating voltage of the electric load 24 is secured.

  When the voltage of the battery 22 is equal to or higher than the lower limit voltage, the driving force by the rotating electrical machine 17 is not limited and normal assist can be executed.

  Even when the voltage of the battery 22 decreases during the execution of the assist, the voltage of the battery 22 can be maintained at the lower limit voltage set higher than the predetermined voltage. As a result, it is possible to stabilize the operation of the electric load 24 having an operating voltage equal to or higher than a predetermined voltage.

  Compared with the case where the driving force by the rotating electrical machine 17 is not limited, it is not necessary to change the control of the engine ECU 20, and the assist is continued while the operating voltage of the electric load 24 is secured by the control of the rotating electrical machine ECU 14. Can be executed.

  The assist control can be executed with the following modifications.

  The voltage control unit causes the assist control unit to control the inverter 13 so that the voltage acquired by the voltage sensor 41 becomes equal to or higher than a predetermined voltage when the assist control unit executes the assist. Thus, the rotary electric machine 17 may be continuously driven. Specifically, when the voltage detected by the voltage sensor 41 becomes less than a predetermined voltage, the inverter 13 may be controlled so as to decrease the voltage supplied to the rotating electrical machine 17 by a predetermined amount. According to such a configuration, the assist is continuously executed while the operating voltage of the electric load 24 is generally secured by the simple control that causes the voltage of the battery 22 to become equal to or higher than the predetermined voltage when the voltage of the battery 22 becomes lower than the predetermined voltage. can do.

  FIG. 4 is a flowchart showing a procedure of the assist control. The rotating electrical machine ECU 14 determines whether or not the voltage detected by the voltage sensor 41 is less than a predetermined voltage (S21). When the rotating electrical machine ECU 14 determines that the detected voltage is not less than the predetermined voltage (S21: NO), the rotating electrical machine 17 drives the rotating electrical machine 17 to generate the target torque (S22). On the other hand, when it is determined that the detected voltage is less than the predetermined voltage (S21: YES), the rotating electrical machine ECU 14 decreases the voltage supplied to the rotating electrical machine 17 by a predetermined amount so that the detected voltage becomes equal to or higher than the predetermined voltage. The rotating electrical machine 17 is driven so as to be (S23). The predetermined amount can be arbitrarily set, and the voltage supplied to the rotating electrical machine 17 by setting it to a large value may be reduced at once, or the voltage supplied to the rotating electrical machine 17 by setting it to a small value may be repeated. It may be decreased. Note that when the rotating electrical machine 17 is driven so that the detected voltage is equal to or higher than the predetermined voltage, the torque generated by the rotating electrical machine 17 is equal to or less than the target torque.

  The voltage control unit controls the inverter 13 by the assist control unit so that the voltage detected by the voltage sensor 41 is predicted to be less than the predetermined voltage during the execution of the assist by the assist control unit so that the voltage is not less than the predetermined voltage. Thus, the rotating electrical machine 17 may be continuously driven. Specifically, the voltage of the battery 22 may be predicted from the voltage decrease rate detected by the voltage sensor 41, and the voltage supplied to the rotating electrical machine 17 may be reduced in advance. Further, the amount by which the supplied voltage is decreased in advance may be variable based on the detected voltage decrease rate. Further, the amount by which the supplied voltage is decreased in advance may be variable based on the difference between the detected voltage and the predetermined voltage. According to such a configuration, even when the voltage of the battery 22 rapidly decreases during the execution of the assist, the voltage of the battery 22 can be predicted so as not to become less than a predetermined voltage.

  FIG. 5 is a flowchart showing a procedure of the assist control. The rotating electrical machine ECU 14 predicts whether or not the voltage detected by the voltage sensor 41 is less than a predetermined voltage (S31). When the rotating electrical machine ECU 14 does not predict that the detected voltage will be less than the predetermined voltage (S31: NO), the rotating electrical machine 17 drives the rotating electrical machine 17 to generate the target torque (S32). On the other hand, when it is predicted that the detected voltage is less than the predetermined voltage (S31: YES), the rotating electrical machine ECU 14 reduces the voltage supplied to the rotating electrical machine 17 in advance so that the detected voltage does not become less than the predetermined voltage. The rotary electric machine 17 is driven (S33). When the rotating electrical machine 17 is driven so that the detected voltage does not become less than the predetermined voltage, the torque generated by the rotating electrical machine 17 is equal to or less than the target torque.

  -An assist control part can be comprised by rotary electric machine ECU14, and a voltage control part can also be comprised by engine ECU20. In this case, the rotating electrical machine ECU 14 inputs a target torque (corresponding to a command value of the driving force) to be generated by the rotating electrical machine 17 from the engine ECU 20, and controls the inverter 13 based on the target torque after the vehicle starts running to rotate the rotating electrical machine. 17 is driven to assist the driving force of the engine 101. The engine ECU 20 controls the target torque so that the voltage acquired by the voltage sensor 41 becomes equal to or higher than a predetermined voltage during the execution of the assist by the rotating electrical machine ECU 14, and controls the inverter 13 by the rotating electrical machine ECU 14 to control the rotating electrical machine 17. May be continuously driven. According to such a configuration, it is not necessary to change the control of the rotating electrical machine ECU 14 as compared with the case where the driving force of the rotating electrical machine 17 is not limited, and the operating voltage of the electric load 24 is secured by the control of the engine ECU 20. Assist can be executed continuously.

  FIG. 6 is a flowchart showing a procedure of the assist control. The engine ECU 20 determines whether or not the voltage detected by the voltage sensor 41 is equal to or higher than the lower limit voltage (S41). If the engine ECU 20 determines that the detected voltage is equal to or higher than the lower limit voltage (S41: YES), the engine ECU 20 sets a target torque based on the driver's request (S42). On the other hand, when it is determined that the detected voltage is not equal to or higher than the lower limit voltage (S41: NO), the engine ECU 20 sets the target torque so that the detected voltage becomes the lower limit voltage (S43). When the target torque is set so that the detected voltage becomes the lower limit voltage, the torque generated by the rotating electrical machine 17 is equal to or less than the target torque set based on the driver's request.

  The voltage sensor 41 detects the voltage between the high voltage side connection point P1 and the low voltage side connection point P2 of the inverter 13. The high voltage side connection point P1 and the B terminal are connected by a first conductive member (wiring 18). For this reason, when a voltage is supplied from the B terminal to the high voltage side connection point P1, a voltage drop occurs due to the electric resistance of the first conductive member. Further, the low-voltage side connection point P2 and the engine 101 as the grounding part are electrically connected by a second conductive member (the heat radiating plate 63, the rear body 53, the front body 52, and the connecting member 69). For this reason, a difference occurs between the electric potential of the second conductive member between the electric potential of the low-voltage side connection point P2 and the electric potential of the ground portion. Therefore, there is a deviation between the voltage between the high-voltage side connection point P1 and the low-voltage side connection point P2 of the inverter 13 detected by the voltage sensor 41 and the voltage between the B terminal and the grounding part.

  Here, as described above, the electrical resistances of the first conductive member and the second conductive member are measured in advance. For this reason, the voltage controller 17 rotates the rotating electrical machine 17 based on the voltage detected by the voltage sensor 41 and the electric resistances of the first conductive member and the second conductive member so that the voltage at the B terminal becomes the target supply voltage. You may control the drive of. For example, the current flowing through the first conductive member and the second conductive member is detected by a current sensor, and the voltage drop is calculated by multiplying the detected current by the electrical resistance of the first conductive member and the second conductive member. Note that the current flowing through the first conductive member and the second conductive member may be estimated, and the voltage drop may be calculated using the estimated current. As the target supply voltage, the lower limit voltage or the predetermined voltage can be employed. Specifically, the voltage control unit determines that the voltage detected by the voltage sensor 41 is a voltage obtained by subtracting the voltage drop due to the electrical resistance of the first conductive member and the second conductive member from the target supply voltage. 13 can control the drive of the rotating electrical machine 17. According to such a configuration, the operating voltage of the electric load 24 connected to the B terminal can be ensured after accurately grasping the voltage of the B terminal.

  As shown by a broken line in FIG. 1, a voltage sensor 41A (corresponding to a voltage acquisition unit) that directly detects the terminal voltage of the battery 22 may be provided. Then, the voltage control unit continues the rotating electrical machine 17 by controlling the inverter 13 by the assist control unit so that the voltage detected by the voltage sensor 41A becomes equal to or higher than a predetermined voltage during the execution of the assist by the assist control unit. It may be driven.

  The voltage control unit is configured to rotate the rotating electrical machine based on the voltage detected by the voltage sensor 41A and the electric resistances of the first conductive member and the second conductive member so that the voltage supplied to the inverter 13 becomes the command voltage. The drive of 17 may be controlled. According to such a configuration, even when the rotating electrical machine 17 is driven based on the detection value of the voltage sensor 41A that directly detects the terminal voltage of the battery 22, it depends on the electrical resistance of the first conductive member and the second conductive member. In consideration of the voltage drop, the rotating electrical machine 17 can generate the target torque.

[Power generation control]
Next, power generation control will be described in which the rotating electrical machine 17 is driven by the engine 101 to cause AC power generation, and the inverter 13 converts the AC voltage into a DC voltage and outputs it to the B terminal. This power generation control may be performed as regenerative power generation when the vehicle is decelerated, or may be performed during engine operation. This power generation control is executed by the rotating electrical machine ECU 14 (corresponding to a voltage control unit).

  As described above, there is a difference between the voltage between the high-voltage side connection point P1 and the low-voltage side connection point P2 of the inverter 13 detected by the voltage sensor 41 and the voltage between the B terminal and the grounded portion. Therefore, in the present embodiment, the voltage control unit is based on the voltage detected by the voltage sensor 41 and the electric resistances of the first conductive member and the second conductive member so that the voltage at the B terminal becomes the target generated voltage. The generated voltage by the rotating electrical machine 17 is controlled. Specifically, the voltage control unit includes an inverter so that the voltage detected by the voltage sensor 41 is a voltage obtained by adding a voltage drop due to the electric resistance of the first conductive member and the second conductive member to the target generated voltage. Based on the control 13, the generated voltage by the rotating electrical machine 17 is controlled. For example, the current flowing through the first conductive member and the second conductive member is detected by a current sensor, and the voltage drop is calculated by multiplying the detected current by the electrical resistance of the first conductive member and the second conductive member. Note that the current flowing through the first conductive member and the second conductive member may be estimated, and the voltage drop may be calculated using the estimated current.

  The power generation control has the following advantages.

  Even when a large current flows from the rotating electrical machine unit 10, the voltage at the B terminal can be controlled to the target generated voltage in consideration of the voltage drop due to the first conductive member and the second conductive member.

  In the configuration in which the heat sink 63 to which the inverter 13 is attached is used as the second conductive member, the voltage at the B terminal can be controlled to the target voltage in consideration of the voltage drop due to the heat sink 63.

  In the configuration in which the housing (front body 52 and rear body 53) that houses the rotating electrical machine 17 is used as the second conductive member, the voltage at the B terminal can be controlled to the target voltage in consideration of the voltage drop due to the housing.

  In the configuration in which the connecting member 69 that connects the housing that houses the rotating electrical machine 17 and the engine 101 is used as the second conductive member, the voltage at the B terminal is controlled to the target voltage in consideration of the voltage drop due to the connecting member 69. be able to.

  In the configuration in which the high-voltage side connection point P1 and the B terminal are connected by the wiring 18, the voltage at the B terminal can be controlled to the target voltage in consideration of the voltage drop due to the wiring 18.

  Note that the above-described embodiment may be modified as follows.

  The voltage sensor 41 may be provided in the rotating electrical machine ECU 14. In that case, the high-voltage side connection point P1 and the low-voltage side connection point P2 are also located in the rotating electrical machine ECU.

  -As the 1st conductive member and the 2nd conductive member, the number of members contained in them can be changed suitably, and members other than each above-mentioned member can also be adopted.

  -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, a rotor 58 having a magnet may be employed instead of the field winding 12. 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 (Motor Generator) that generates a driving force capable of driving the vehicle may be employed.

  DESCRIPTION OF SYMBOLS 10 ... Rotary electric machine unit, 13 ... Inverter, 17 ... Rotary electric machine, 22 ... Battery, 24 ... Electric load, 41 ... Voltage sensor, 41A ... Voltage sensor, 101 ... Engine.

Claims (7)

An engine (101) that generates a driving force, a rotating electric machine (17) that can assist the driving force of the engine, and a driving circuit (13) that drives the rotating electric machine by adjusting electric power supplied to the rotating electric machine. ), An electric load (24) having an operating voltage equal to or higher than a predetermined voltage, and a battery (22) for supplying electric power to the drive circuit and the electric load, and a control for controlling the rotating electrical machine A device,
An assist control section (14) for assisting the driving force of the engine by driving the rotating electrical machine by controlling the drive circuit after the vehicle starts running;
A voltage acquisition unit (41, 41A) for acquiring the voltage of the battery;
During the execution of the assist by the assist control unit, the drive circuit is continuously controlled by the assist control unit so that the voltage acquired by the voltage acquisition unit becomes equal to or higher than the predetermined voltage. A voltage controller (14, 20)
A control device for a rotating electrical machine comprising:   When the voltage acquired by the voltage acquisition unit is equal to or higher than a lower limit voltage set higher than the predetermined voltage during execution of the assist by the assist control unit, the voltage control unit The control device for a rotating electrical machine according to claim 1, wherein control of the drive circuit is not limited.   The voltage control unit is maintained at the lower limit voltage when the voltage acquired by the voltage acquisition unit drops to a lower limit voltage set higher than the predetermined voltage during execution of the assist by the assist control unit. The rotating electrical machine control device according to claim 1, wherein the assist control unit controls the driving circuit to continuously drive the rotating electrical machine.   The voltage control unit is configured to control the assist control so that when the assist control unit performs the assist, the voltage acquired by the voltage acquisition unit becomes equal to or higher than the predetermined voltage when the voltage is less than the predetermined voltage. The control device for a rotating electrical machine according to claim 1, wherein the driving circuit is controlled by a unit to continuously drive the rotating electrical machine.   The voltage control unit may prevent the assist from being less than the predetermined voltage when the assist control unit predicts that the voltage acquired by the voltage acquisition unit is less than the predetermined voltage during execution of the assist. The control device for a rotating electrical machine according to claim 1 or 2, wherein the control unit controls the drive circuit to continuously drive the rotating electrical machine. The vehicle includes an engine ECU (20) that controls an operating state of the engine, and a rotating electrical machine ECU (14) that controls a driving state of the rotating electrical machine,
The assist control unit and the voltage control unit are configured by the rotating electrical machine ECU,
The rotating electrical machine ECU inputs a command value of a driving force to be generated by the rotating electrical machine from the engine ECU, and the voltage acquired by the voltage acquiring unit is equal to or higher than the predetermined voltage during execution of the assist. The control device for a rotating electrical machine according to claim 1, wherein the rotating electrical machine is continuously driven by controlling the drive circuit based on the command value. The vehicle includes an engine ECU (20) that controls an operating state of the engine, and a rotating electrical machine ECU (14) that controls a driving state of the rotating electrical machine,
The assist control unit is configured by the rotating electrical machine ECU,
The voltage control unit is configured by the engine ECU,
The rotating electrical machine ECU inputs a command value of a driving force to be generated by the rotating electrical machine from the engine ECU, and controls the drive circuit based on the command value after the vehicle starts running to drive the rotating electrical machine. Assisting the driving force of the engine,
The engine ECU controls the command value so that the voltage acquired by the voltage acquisition unit is equal to or higher than the predetermined voltage during execution of the assist by the rotating electrical machine ECU, and the rotating electrical machine ECU controls the command value. The control device for a rotating electrical machine according to any one of claims 1 to 5, wherein the rotating electrical machine is continuously driven by controlling a drive circuit.

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