JP2018090212A - Rotary electric machine control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately execute power running drive of a rotary electric machine.SOLUTION: In an engine system, engine starting and torque assist are executed by power running drive of a rotary electric machine 21. A rotary electric machine ECU 23 comprises a first control part which controls torque of the rotary electric machine 21 by using first correlation data when starting an engine, and a second control part which controls the torque of the rotary electric machine 21 by using second correlation data when executing torque assist. In the first correlation data, a relationship between a rotation speed and the torque of the rotary electric machine 21 is determined in a first range including a starting rotation speed region which is used when starting the engine. In the second correlation data, the relationship between the rotation speed and the torque of the rotary electric machine 21 is determined so that the torque to the rotation speed becomes a value smaller than that of the first correlation data in a second range which includes the first range and is wider than the first range.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating electrical machine control device that controls driving of a rotating electrical machine mounted on a vehicle or the like.

  For example, a technology has been put into practical use that includes an engine as a power source for a vehicle, and a rotating electrical machine that is drivingly connected to a rotating shaft of the engine and driven by power feeding from a power supply unit. For example, in the technique disclosed in Patent Document 1, in a system including a rotating electrical machine that is mechanically coupled to an output shaft of an engine via a belt and a pulley, a driver is operated in a middle / high rotational speed range of the rotating electrical machine after the vehicle starts running The torque intention by the rotating electrical machine is permitted with respect to the acceleration intention (acceleration request), and the torque assist is prohibited when the rotational speed of the rotating electrical machine becomes low during the torque assist. As a result, acceleration response is improved when acceleration is performed by depressing the accelerator pedal in the middle / high rotational speed range of the rotating electrical machine after the vehicle starts running. In addition, by prohibiting torque assist in the low rotational speed region of the rotating electrical machine, the squealing of the belt in the low rotational speed region is prevented, and the rotational shaft strength of each pulley is ensured.

  In the cited document 1, the resonance point of rotational vibration exists in the engine and the rotating electrical machine in a rotational speed range lower than 1000 rpm as the engine rotational speed, and the engine rotational speed is It is described that torque assist is prohibited when the speed is 1000 rpm or less.

JP 2013-189135 A

  By the way, in a vehicle equipped with a rotating electrical machine, when torque assist is performed by powering drive of the rotating electrical machine, and engine starting is performed by powering drive of the rotating electrical machine, the following problems may occur. In other words, in the above existing technology, torque assist is prohibited in the low rotational speed range of the rotating electrical machine. For example, when the engine start by the rotating electrical machine is completed, even if a request for torque assist occurs, At that time, the rotating electrical machine is in a low rotation state, and torque assist cannot be performed continuously. It is also conceivable that even when an acceleration request is generated by an accelerator operation when the engine is in an idle operation state, the rotating electrical machine is in a low rotation state and torque assist cannot be performed.

  On the other hand, at the time of powering driving of the rotating electrical machine, there is a concern about the problem of heat due to continued energization of the inverter. This thermal problem is particularly a concern when torque assist is performed by a rotating electrical machine, and there is room for improvement when engine starting and torque assist are performed by powering driving of the rotating electrical machine.

  The present invention has been made in view of the above problems, and a main object of the present invention is to provide a rotating electrical machine control device capable of appropriately performing powering driving of the rotating electrical machine.

  Hereinafter, means for solving the above-described problems and the effects thereof will be described. In the following, for ease of understanding, the reference numerals of the corresponding components in the embodiments of the invention are appropriately shown in parentheses, but are not limited to the specific configurations shown in parentheses.

In the first means,
The engine (42), the rotating electric machine (21) that is drivingly connected to the rotating shaft of the engine and capable of powering driving, and the plurality of switches (Sp, Sn) connected to the power source (11, 12) are turned on and off. A switching circuit unit (22) for energizing each phase in the rotating electrical machine, and applied to an engine system that performs start of the engine and torque assist that assists the torque of the engine by powering driving of the rotating electrical machine A rotating electrical machine control device (23),
A first control unit that controls torque of the rotating electrical machine using first correlation data at the time of starting the engine;
A second control unit that controls the torque of the rotating electrical machine using second correlation data when the torque assist is performed;
With
The first correlation data is obtained by defining a relationship between the rotational speed and torque of the rotating electrical machine in a first range including a starting rotational speed range used when starting the engine.
In the second range including the first range and wider than the first range, the second correlation data includes a relationship between a rotational speed and a torque of the rotating electrical machine, and a torque with respect to the rotational speed is greater than the first correlation data. Is determined to be a small value.

  In an engine system that performs engine start and torque assist with a rotating electrical machine, the torque of the rotating electrical machine is controlled using the first correlation data when the engine is started, and the second correlation data is rotated when the torque assist is performed. Electric torque was controlled. In this case, when the engine is started, torque is controlled based on the rotation speed of the rotating electrical machine in the first range including the start rotation speed range. Further, when the torque assist is performed, the torque is controlled based on the rotation speed of the rotating electrical machine in a second range that includes the first range and is wider than the first range. Here, since the second correlation data for torque assist is determined in a second range that includes the first range and is wider than the first range, following the engine start by the power running drive of the rotating electrical machine, It becomes possible to perform torque assist by power running drive.

  Further, when the engine is started and the torque assist is compared, when the engine is started, the rotating electric machine is driven in a relatively short period of time, so that the switch is energized in a relatively short time in the switching circuit unit. On the other hand, at the time of torque assist, the rotating electrical machine is driven in a longer period than when the engine is started, and the switch is energized in a relatively long time in the switching circuit unit. In this case, there is a concern about an excessive increase in temperature in the switching circuit section during torque assist. In this regard, the second correlation data used at the time of torque assist is determined so that the torque with respect to the rotation speed of the rotating electrical machine is smaller than the first correlation data. Thereby, the power running drive of a rotary electric machine can be implemented appropriately, taking into consideration the influence of heat caused by continuing torque assist.

  In the second means, the second correlation data is such that the torque decreases as the rotational speed of the rotating electrical machine increases, while the torque is limited in a low rotational speed range lower than a predetermined rotational speed. The relationship between the rotational speed and the torque is determined.

  In a rotating electrical machine, the relationship between the rotational speed and the torque is such that the torque decreases as the rotational speed increases. That is, when the rotational speed is reduced, the torque is increased. However, in the low rotational speed region of the rotating electrical machine, the neutral point voltage is low because the motor electromotive force is low, and the energization current flowing through the switching circuit section is large. For this reason, there is a concern about the problem of heat in the switching circuit section when performing torque assist. In this regard, in the above-described configuration, the torque is limited in the low rotation speed region on the lower rotation side than the predetermined rotation speed by using the second correlation data. Therefore, even if the rotating electrical machine is power-driven at a low rotational speed region, it is possible to suppress the occurrence of problems due to heat.

  In the third means, the second correlation data indicates that the torque of the rotating electrical machine at a predetermined rotational speed higher than the rotational speed corresponding to the idle rotational speed of the engine in the first range is the predetermined rotational speed. The speed is determined as a higher value than the low rotation side and the high rotation side.

  According to the above configuration, in the second correlation data, in the first range, the torque of the rotating electrical machine at a predetermined rotational speed higher than the rotational speed corresponding to the idle rotational speed of the engine is lower than the predetermined rotational speed. In addition, when the engine is in an idling state, the torque of the rotating electrical machine is limited so as not to increase. As a result, even if the rotating electrical machine is power-driven at a low rotational speed region, it is possible to suppress the occurrence of problems due to heat.

  In the fourth means, the second control unit controls the torque of the rotating electrical machine using the second correlation data in a state where fuel injection to the engine is stopped or restricted in an idle operation state of the engine. To do.

  According to the above configuration, the engine idle operation can be realized by performing torque control of the rotating electrical machine using the second correlation data in a state where fuel injection to the engine is stopped or restricted. In this case, the engine can be appropriately put into an idle operation state while reducing the fuel consumption in the engine. In addition, if torque limitation is performed in the low rotational speed region as described above, the problem of heat can be suppressed even in an idle state where the rotational speed is relatively low.

  In the fifth means, when the engine is started, when the rotational speed of the rotating electrical machine is in a torque limiting range that is a predetermined low rotational speed range including zero, the torque of the rotating electrical machine is determined. Is limited to a predetermined value or less.

  According to the above configuration, when starting the engine, the torque of the rotating electrical machine is limited to a predetermined value or less immediately after the start of the engine. As a result, the energization current of the switching circuit section is limited, and even if it takes time to increase the rotational speed immediately after the start of the engine, excessive temperature increase in the switching circuit section can be suppressed.

  According to a sixth means, there is provided a system for determining that an overcurrent has flowed in at least one of the rotating electrical machine and the switching circuit unit based on the fact that the energization current flowing through the switching circuit unit has increased to a predetermined overcurrent threshold. The first control unit applies the torque of the rotating electrical machine to a predetermined value when the rotational speed of the rotating electrical machine is in a torque limiting range that is a predetermined low rotational speed range including zero when the engine is started. Restrict to:

  When powering driving of the rotating electrical machine is started at the time of starting the engine, it is conceivable that a large current flows through the switching circuit unit as an inrush current at the beginning of the start. In this case, there is a concern that the inrush current is erroneously determined as an overcurrent. In this regard, according to the above configuration, when starting the engine, the torque of the rotating electrical machine is limited to a predetermined value or less when the rotational speed of the rotating electrical machine is in a torque limiting range that is a predetermined low rotational speed range including zero. The That is, immediately after the start of the engine, the torque of the rotating electrical machine is limited to a predetermined value or less. As a result, the energization current of the switching circuit unit is limited, and as a result, the inrush current is limited. Therefore, it is possible to suppress erroneous determination that the inrush current generated at the beginning of driving of the rotating electrical machine is an overcurrent.

  In the seventh means, when the torque assist is requested, the second controller temporarily stops the torque assist every time a predetermined assist duration time elapses.

  If the torque assist by the power running drive of the rotating electrical machine is continuously performed, there is a concern about overheating in the switching circuit unit. In this regard, according to the above configuration, when a predetermined assist duration time elapses when torque assist is requested, the torque assist is temporarily suspended, so that the power running drive of the rotating electrical machine is continuously performed for a long time. The problem of heat resulting from the implementation can be suppressed.

  The eighth means includes a setting unit that sets the assist duration time as a shorter time when the rotation speed of the rotating electrical machine is low than when the rotation speed is high, and the second control unit requests the torque assist. At the time, the torque assist is suspended according to the assist duration set by the setting unit.

  At the time of torque assist by the power running drive of the rotating electrical machine, the degree of influence of heat in the switching circuit unit differs depending on the rotational speed of the rotating electrical machine. In this regard, when the rotation speed of the rotating electrical machine is low, the assist duration time is set to be shorter than that when the rotating electrical machine is high. Therefore, the degree of the influence of heat in the switching circuit unit depends on the rotation speed of the rotating electrical machine. Even if there is a difference, it can be suitably dealt with.

  In the ninth means, the power supply unit includes a first power storage unit (11) and a second power storage unit (12) connected in parallel to the switching circuit unit, while the switching circuit unit and the first power storage unit are provided. Applied to a system provided with a first switch (31) for opening and closing a path between the switching circuit unit and a second switch (32) for opening and closing a path between the switching circuit unit and the second power storage unit, In the second control unit, when the torque assist is performed in a state where one of the first switch and the second switch is closed, both the first switch and the second switch are closed. The torque of the rotating electrical machine is made different between the case where the torque assist is performed in the state.

  In a system including a first switch that opens and closes a path between the switching circuit unit and the first power storage unit, and a second switch that opens and closes a path between the switching circuit unit and the second power storage unit, torque generated by the rotating electrical machine When assist is performed, it is necessary to consider the heat problem associated with energization of the first switch and the second switch. In addition, considering the power supply from each power storage unit to the rotating electrical machine, the current flowing through the first and second switches is different between when power is supplied from one power storage unit and when power is supplied from both power storage units. Since the sizes are different, the degree of influence of heat is different. In this regard, when torque assist is performed with one of the first switch and the second switch closed, and when torque assist is performed with both the first switch and the second switch closed, Thus, since the torque of the rotating electrical machine is made different, it is possible to suitably protect each switch regardless of the open / closed state of each switch.

The electric circuit diagram which shows the power supply system of embodiment. The circuit diagram which shows the electric constitution of a rotary electric machine unit. (A) is a figure which shows a starting torque map, (b) is a figure which shows an assist torque map. The figure which shows the relationship between switch temperature and assist continuation time Tx. The flowchart which shows the procedure regarding the drive control of a rotary electric machine. The time chart which shows the control which power-drives a rotary electric machine more concretely. The flowchart which shows the procedure of the drive control of the rotary electric machine at the time of idle operation. The flowchart which shows the procedure regarding the drive control of a rotary electric machine. The figure which shows the relationship between ISG rotational speed and assist continuation time Tx.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings. In the present embodiment, an in-vehicle power supply system that supplies power to various devices of the vehicle in a vehicle that runs using an engine (internal combustion engine) as a drive source is embodied.

  As shown in FIG. 1, this power supply system is a dual power supply system having a lead storage battery 11 as a first power storage unit and a lithium ion storage battery 12 as a second power storage unit. In addition, power can be supplied to the various electric loads 14 and 15 and the rotating electrical machine unit 20. Further, each of the storage batteries 11 and 12 can be charged by the rotating electrical machine unit 20. In this system, the lead storage battery 11 and the lithium ion storage battery 12 are connected in parallel to the rotating electrical machine unit 20, and the lead storage battery 11 and the lithium ion storage battery 12 are connected in parallel to the electrical loads 14 and 15. .

  The lead storage battery 11 is a well-known general-purpose storage battery. On the other hand, the lithium ion storage battery 12 is a high-density storage battery that has less power loss during charging / discharging than the lead storage battery 11, and has a high output density and energy density. The lithium ion storage battery 12 may be a storage battery having higher energy efficiency during charging / discharging than the lead storage battery 11. Moreover, the lithium ion storage battery 12 is comprised as an assembled battery which has a some single cell, respectively. These storage batteries 11 and 12 have the same rated voltage, for example, 12V.

  Although the detailed description by illustration is omitted, the lithium ion storage battery 12 is housed in a housing case and configured as a battery unit U integrated with a substrate. The battery unit U has output terminals P1, P2 and P0, of which the lead storage battery 11, the starter 13 and the electric load 14 are connected to the output terminals P1 and P0, and the electric load 15 and the rotation are connected to the output terminal P2. The electric unit 20 is connected.

  The electric loads 14 and 15 have different requirements for the voltage of the supplied power supplied from the storage batteries 11 and 12. Among these, the electric load 14 includes a constant voltage required load that is required to be stable so that the voltage of the supplied power is constant or at least fluctuates within a predetermined range. On the other hand, the electric load 15 is a general electric load other than the constant voltage required load. It can be said that the electric load 14 is a protected load. In addition, it can be said that the electric load 14 is a load that does not allow a power supply failure, and the electric load 15 is a load that allows a power supply failure compared to the electric load 14.

  Specific examples of the electric load 14 that is a constant voltage required load include various ECUs such as a navigation device, an audio device, a meter device, and an engine ECU. In this case, by suppressing the voltage fluctuation of the supplied power, it is possible to suppress an unnecessary reset or the like in each of the above devices, and to realize a stable operation. The electric load 14 may include a travel system actuator such as an electric steering device or a brake device. Specific examples of the electric load 15 include a seat heater, a heater for a defroster for a rear window, a headlight, a wiper for a front window, and a blower fan for an air conditioner.

  The rotating electrical machine unit 20 includes a rotating electrical machine 21 as a three-phase AC motor, an inverter 22 as a power converter (switching circuit unit), and a rotating electrical machine ECU 23 that controls the operation of the rotating electrical machine 21. The rotating electrical machine unit 20 is a generator with a motor function, and is configured as an electromechanically integrated ISG (Integrated Starter Generator). Although not shown in the figure because it is a well-known configuration, the rotating electrical machine 21 is drivingly connected to the engine output shaft (crankshaft) by a connecting member comprising a belt and a pulley, and the rotating electrical machine 21 is connected to the rotating electrical machine 21 by a predetermined pulley ratio. Rotation is transmitted to and from the engine. For example, when the pulley ratio is 2.3 and the engine rotation speed is 1000 rpm, the rotation speed of the rotating electrical machine 21 is 2300 rpm. For convenience of explanation, the rotation speed of the rotating electrical machine 21 is also referred to as ISG rotation speed.

  Here, the electrical configuration of the rotating electrical machine unit 20 will be described with reference to FIG. The rotating electrical machine 21 includes U-phase, V-phase, and W-phase phase windings 24U, 24V, and 24W as three-phase armature windings, and a field winding 25. The phase windings 24U, 24V, 24W are star-connected and are connected to each other at a neutral point. The rotation shaft of the rotating electrical machine 21 is rotated by the rotation of the engine output shaft, while the engine output shaft is rotated by the rotation of the rotating shaft of the rotating electrical machine 21. That is, the rotating electrical machine 21 has a power generation function that generates power (regenerative power generation) by rotating the engine output shaft and the axle, and a power running function that applies rotational force to the engine output shaft. For example, the rotating electrical machine 21 is driven by powering at the time of engine restart in idling stop control or power assist for vehicle acceleration.

  The inverter 22 converts the AC voltage output from each phase winding 24U, 24V, 24W into a DC voltage and outputs it to the battery unit U. The inverter 22 converts the DC voltage input from the battery unit U into an AC voltage and outputs the AC voltage to the phase windings 24U, 24V, and 24W. The inverter 22 is a bridge circuit having the same number of upper and lower arms as the number of phases of the phase winding, and constitutes a three-phase full-wave rectifier circuit. The inverter 22 constitutes a drive circuit that drives the rotating electrical machine 21 by adjusting the electric power supplied to the rotating electrical machine 21.

  The inverter 22 includes an upper arm switch Sp and a lower arm switch Sn for each phase, and energization is performed for each phase by turning on and off the switches Sp and Sn. In the present embodiment, a voltage-controlled semiconductor switching element is used as each of the switches Sp and Sn. Specifically, an N-channel MOSFET is 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.

  An intermediate connection point of the series connection body of the switches Sp and Sn in each phase is connected to one end of each phase winding 24U, 24V, and 24W. Further, a voltage sensor 26 that detects the input / output voltage of the inverter 22 is provided between the high-voltage side path and the low-voltage side path of the inverter 22. In addition, the rotating electrical machine unit 20 is provided with, for example, a current sensor 27 that detects a current flowing through an energization path of the inverter 22 and a current sensor 28 that detects a current flowing through the field winding 25. The current sensor 27 may be provided between the inverter 22 and each phase winding 24U, 24V, 24W (symbol 27a in the figure), and each phase between the lower arm switch Sn and the ground line. (Reference numeral 27b in the figure). The rotating electrical machine 21 is provided with a temperature sensor 29 for detecting the temperature of the stator, and the inverter 22 is provided with a temperature sensor 30 for detecting the temperature of each of the switches Sp and Sn. Detection signals from the sensors 26 to 29 are appropriately input to the rotating electrical machine ECU 23. Although not shown, the rotating electrical machine 21 is provided with a rotation angle sensor that detects angle information of the rotor, and the inverter 22 is provided with a signal processing circuit that processes a signal from the rotation angle sensor. Yes.

  The rotating electrical machine ECU 23 is configured by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. The rotating electrical machine ECU 23 adjusts the excitation current flowing through the field winding 25 by an IC regulator (not shown) inside. Thereby, the power generation voltage (output voltage with respect to the battery unit U) of the rotary electric machine unit 20 is controlled. The rotating electrical machine ECU 23 controls on / off of the switches Sp and Sn of each phase according to the energization phase, and controls the energization current by adjusting an on / off ratio (for example, duty ratio) when energizing each phase. Here, the rotating electrical machine ECU 23 drives the rotating electrical machine 21 by current control in the inverter 22 to assist the driving force of the engine. The rotating electrical machine 21 can apply initial rotation to the crankshaft when starting the engine, and also has a function as an engine starting device.

  Next, the electrical configuration of the battery unit U will be described. As shown in FIG. 1, in the battery unit U, as an in-unit electric path, an electric path L1 that connects the output terminals P1 and P2, and an electric path L2 that connects a point N0 on the electric path L1 and the lithium ion storage battery 12 And are provided. Among these, the switch 31 is provided in the electrical path L1, and the switch 32 is provided in the electrical path L2. In addition, in terms of an electrical path connecting the lead storage battery 11 and the lithium ion storage battery 12, a switch 31 is provided on the lead storage battery 11 side of the connection point N0 with the rotating electrical machine unit 20 in the electrical path, and the connection point N0. The switch 32 is provided on the lithium ion storage battery 12 side.

  Each of the switches 31 and 32 includes, for example, 2 × n MOSFETs (semiconductor switching elements) and is connected in series so that the parasitic diodes of the pair of MOSFETs are opposite to each other. When the switches 31 and 32 are turned off, the parasitic diode completely cuts off the current flowing through the path where the switches are provided. As the switches 31 and 32, IGBTs or bipolar transistors can be used instead of MOSFETs. When IGBTs or bipolar transistors are used as the switches 31 and 32, diodes in opposite directions may be connected in parallel to the switches 31 and 32, respectively, instead of the parasitic diode.

  The battery unit U is provided with a bypass path L0 that bypasses the switch 31. The bypass path L0 is provided so as to connect the output terminal P0 and the point N0 on the electrical path L1. The output terminal P0 is connected to the lead storage battery 11 through the fuse 35. By the bypass path L0, the lead storage battery 11, the electrical load 15, and the rotating electrical machine unit 20 can be connected without using the switch 31. In the bypass path L0, for example, a bypass switch 36 made of a normally closed mechanical relay is provided. By turning on (closing) the bypass switch 36, the lead storage battery 11, the electric load 15, and the rotating electrical machine unit 20 are electrically connected even if the switch 31 is turned off (opened).

  The battery unit U includes a battery ECU 37 that controls on / off (opening / closing) of the switches 31 and 32. The battery ECU 37 is constituted by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. The battery ECU 37 controls the on / off of the switches 31 and 32 based on the storage state of each of the storage batteries 11 and 12 and the command value from the engine ECU 40 that is the host controller. Thereby, charging / discharging is implemented using the lead storage battery 11 and the lithium ion storage battery 12 selectively. For example, the battery ECU 37 calculates the SOC (remaining capacity: State Of Charge) of the lithium ion storage battery 12, and sets the charge amount and discharge amount to the lithium ion storage battery 12 so that the SOC is maintained within a predetermined use range. Control.

  The rotating electrical machine ECU 23 of the rotating electrical machine unit 20 and the battery ECU 37 of the battery unit U are connected to an engine ECU 40 as a host controller that manages these ECUs 23 and 37 in an integrated manner. The engine ECU 40 is configured by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like, and controls the operation of the engine 42 based on each engine operation state and vehicle running state. The engine 42 is an internal combustion engine such as a gasoline engine or a diesel engine that generates torque by the combustion of fuel. The engine ECU 40 has a function of performing idling stop control. As is well known, the idling stop control automatically stops the engine 42 when a predetermined automatic stop condition is satisfied, and restarts the engine 42 when the predetermined restart condition is satisfied under the automatic stop state.

  These ECUs 23, 37, 40 and other various in-vehicle ECUs (not shown) are connected to each other via a communication line 41 that constructs a communication network such as a CAN, and can communicate with each other at predetermined intervals. To be implemented. Thereby, the various data memorize | stored in each ECU23,37,40 can mutually be shared.

  By the way, in this system, the engine starting for starting the engine 42 and the torque assist for assisting the torque of the engine 42 are performed by the power running drive of the rotating electrical machine 21. For example, after the engine 42 is automatically stopped by idling stop control, the engine 42 is restarted by driving the rotating electrical machine 21. In addition, under the operating state of the engine 42, driving power of the vehicle is generated by the power running drive of the rotating electrical machine 21, thereby performing torque assist. In addition to the engine restart, the rotating electrical machine 21 may be started by powering driving when the engine 42 is started for the first time.

  Powering drive of the rotating electrical machine 21 is performed by the rotating electrical machine ECU 23 based on a command from the engine ECU 40 which is a host control device. Specifically, when executing the idling stop control, the engine ECU 40 transmits an engine start command signal as a drive command to the rotating electrical machine ECU 23 when a predetermined restart condition is satisfied after the engine is automatically stopped. Then, the rotating electrical machine ECU 23 power-drives the rotating electrical machine 21 based on the engine start command signal. Further, the engine ECU 40 determines whether or not to perform torque assist by the rotating electrical machine 21 under the operating state of the engine 42, and when performing torque assist, the engine ECU 40 provides torque assist as a drive command to the rotating electrical machine ECU 23. Send command signal. Then, the rotating electrical machine ECU 23 power-drives the rotating electrical machine 21 based on the torque assist command signal. In short, the rotating electrical machine 21 is driven by a power running in a start mode for starting the engine and an assist mode for performing torque assist.

  The engine ECU 40 may transmit a signal indicating that the engine is in the start mode and a torque request value at the time of starting the engine (for example, a maximum torque at the start) as a drive command for starting the engine. Further, the engine ECU 40 may transmit, as a drive command at the time of torque assist, a signal indicating the assist mode and a torque request value at the time of torque assist (for example, maximum torque at assist).

  In the present embodiment, it is configured to allow the torque assist to be performed in the entire engine rotation speed under the operating state of the engine 42. That is, torque assist can be performed regardless of the engine speed. Thereby, for example, immediately after the engine is started, that is, immediately after the engine is started by the power running drive of the rotating electrical machine 21 and the engine speed reaches the idle speed (for example, 650 rpm), the torque assist is continued following the engine start. Can be implemented. In this case, when an acceleration request is generated by an accelerator operation in a state where the engine 42 is in an idling state, torque assist can be immediately performed.

  The rotating electrical machine ECU 23 switches the map for calculating the torque (ISG torque) of the rotating electrical machine 21 between the engine start mode and the assist mode. In the engine start mode, the engine start torque map (hereinafter referred to as start) In the assist mode, a torque map for torque assist (hereinafter referred to as an assist torque map) is used. Each of these maps defines the relationship between the ISG rotation speed and the ISG torque. The starting torque map corresponds to “first correlation data”, and the assist torque map corresponds to “second correlation data”. Each of these correlation data may be defined in a format other than the map.

  3A shows the relationship between the ISG rotation speed and the ISG torque in the starting torque map, and FIG. 3B shows the relationship between the ISG rotation speed and the ISG torque in the assist torque map. The starting torque map and the assist torque map have different ISG rotation speed setting ranges.

  In the starting torque map shown in FIG. 3A, the relationship between the ISG rotational speed and the ISG torque is defined in the first range A1 including the starting rotational speed region used when starting the engine. In the present embodiment, the first range A1 is defined with the upper limit rotation speed Nmax corresponding to the rotation speed of the engine 42 in the idle operation state as the upper limit. For example, when the engine rotation speed is 650 rpm in the idle operation state, the idle rotation speed Na as the ISG rotation speed in the idle operation state is 1500 rpm. Further, the upper limit rotation speed Nmax is 2000 rpm by allowing a predetermined margin with respect to the idle rotation speed Na (1500 rpm). That is, the first range A1 of the starting torque map is defined as a rotation speed range that includes the idle rotation speed Na and that has an upper limit rotation speed Nmax that is higher than the idle rotation speed Na.

  In the rotating electrical machine 21, the magnitude of torque is adjusted according to the current flowing through each phase winding 24 </ b> U, 24 </ b> V, 24 </ b> W, that is, the adjustment current adjusted by the inverter 22. The product of the rotational speed and torque of the rotating electrical machine 21 (rotational speed × torque) corresponds to the electric power of the rotating electrical machine 21. Therefore, after the start of the engine 42, the torque decreases as the ISG rotation speed increases. In this respect, the starting torque map shows that the ISG torque is increased immediately after the start of the engine 42 and the ISG rotation speed is low (near zero), and the ISG rotation speed increases after the start of the ISG rotation speed. A relationship that reduces the torque is defined.

  However, the upper limit of the ISG torque is restricted in a predetermined low rotational speed range (zero region B) including zero in the ISG rotational speed. The reason is described below.

  In the inverter 22, there is a possibility that a close failure may occur in each of the switches Sp and Sn. If the close failure of the upper arm switch Sp and the close failure of the lower arm switch Sn occur in the same phase, a short circuit between the power line and the ground line. Therefore, there is a concern that an overcurrent flows through each of the switches Sp and Sn. Therefore, in this system, for example, based on the fact that the energization current of the inverter 22 detected by the current sensor 27 has increased to a predetermined overcurrent determination value, it is determined that an overcurrent has flowed. As a fail-safe process for the battery unit U, the switches 31 and 32 are forcibly opened. The power supply from the lead storage battery 11 or the lithium ion storage battery 12 to the inverter 22 is stopped by opening the switches 31 and 32. In the rotating electrical machine unit 20, there is a possibility that a short circuit may occur in the rotating electrical machine 21 in addition to the short circuit in the inverter 22. For example, if a short circuit occurs in any part of each phase winding 24U, 24V, 24W, Overcurrent flows through the switches Sp and Sn of the inverter 22.

  While the overcurrent determination is performed as described above, it is conceivable that a large current flows as an inrush current with the start of the power running drive at the beginning of the power running drive of the rotating electrical machine 21. In this case, if a large current as an inrush current is detected, it is regarded as an overcurrent, and there is a concern that it may be erroneously determined that a short circuit abnormality (ie, an overcurrent abnormality) has occurred as a result. Therefore, in the present embodiment, the upper limit of the ISG torque is restricted in the torque limit region B, which is the low rotational speed region of the ISG rotational speed, in the starting torque map. The torque limit region B is set to a predetermined low rotational speed region including zero as the ISG rotational speed. That is, by restricting the ISG torque to the upper limit, the ISG torque is limited to a predetermined value or less at the beginning of driving of the rotating electrical machine 21. Further, the energization current of the inverter 22 is limited, and as a result, the inrush current is limited. At this time, the inrush current is limited to a current smaller than the overcurrent determination value. This suppresses erroneous determination that the inrush current generated at the beginning of driving of the rotating electrical machine 21 is an overcurrent.

  When starting the engine, it is conceivable that the belt tensioner operates immediately after the start of powering drive of the rotating electrical machine 21, and the ISG rotational speed starts to increase after the operation. In this respect, by restricting the upper limit of the ISG torque in the torque limit region B, the inverter energization current is limited, and as a result, an excessive increase in the switch temperature of the inverter 22 is suppressed.

  In the assist torque map shown in FIG. 3B, the relationship between the ISG rotation speed and the ISG torque is defined in the second range A2 including the first range A1 and wider than the first range A1. . The second range A2 is defined as a range including at least a higher rotation speed than the upper limit rotation speed Nmax of the first range A1. In the present embodiment, the entire rotational speed range that can occur in the engine 42 is the second range A2.

  In the assist torque map, in particular, the ISG torque with respect to the ISG rotation speed is determined to be a smaller value than the starting torque map. In the starting torque map shown in FIG. 3 (a), the relationship in the assist torque map is indicated by a one-dot chain line for comparison. In the assist torque map, a relationship is set such that the ISG torque is higher at the upper limit rotational speed Nmax of the first range A1 in the starting torque map or the rotational speed in the vicinity thereof than at the lower rotation side and the higher rotation side. Yes.

  Here, in the rotating electrical machine 21, as the relationship between the ISG rotation speed and the ISG torque, the ISG torque becomes smaller as the ISG rotation speed increases. In other words, if the ISG rotation speed decreases, the ISG torque increases. However, since the motor electromotive force is low in the low rotational speed region of the rotating electrical machine 21, the neutral point voltage is low and the energization current flowing through the inverter 22 is large. Therefore, there is a concern about the problem of heat in the switches Sp and Sn of the inverter 22 and the switches 31 and 32 of the battery unit U when performing torque assist. In consideration of this point, in the assist torque map of FIG. 3B, the ISG torque is reduced as the ISG rotation speed increases, while the low rotation speed region (in the figure, lower than the predetermined rotation speed (for example, Nmax)). The relationship between the ISG rotation speed and the ISG torque is determined so that the ISG torque is limited in (C region). In this case, even if the rotating electrical machine 21 is power-running in the low rotational speed region C, the problem of heat in the inverter 22 or the like is less likely to occur.

  It supplements about the restriction | limiting of the ISG torque in the low rotational speed area C. FIG. In the assist torque map, the ISG torque at the upper limit rotation speed Nmax in the first range A1 is determined as a higher value than the lower rotation side and the higher rotation side, and conversely, from the upper limit rotation speed Nmax. However, the ISG torque does not become higher than the upper limit rotation speed Nmax on the low rotation side and the high rotation side. In this case, in other words, the ISG torque is limited on the lower rotation side than the upper limit rotation speed Nmax. In the low rotational speed region C, a positive torque value is defined as the ISG torque in a range including ISG rotational speed = zero.

  In the assist torque map, not the upper limit rotation speed Nmax but a predetermined rotation speed in the vicinity thereof, the ISG torque may be set as a higher value than the low rotation side and the high rotation side of the predetermined rotation speed. In short, the ISG torque at a predetermined rotational speed higher than the idle rotational speed Na in the first range A1 may be set as a higher value than the low rotational speed side and the high rotational speed side of the predetermined rotational speed. . Note that the ISG torque only needs to be limited in the low rotation speed region C. For example, the ISG torque may be determined as a constant value on the lower rotation side than the upper limit rotation speed Nmax.

  Further, in the low rotational speed region C having the upper limit rotational speed Nmax as the upper limit, an extremely low rotational speed region D that includes zero as the ISG rotational speed and has an upper rotational speed that is lower than the idle rotational speed Na is defined. ing. In this extremely low rotational speed region D, the ISG torque is a smaller value in the low rotational speed region C than in regions other than D. In this case, even when the ISG rotational speed is reduced to the extremely low rotational speed range D, it is possible to continuously execute the torque assist while giving a desired limit as the ISG torque. For example, when a CVT (continuously variable transmission) is used as a vehicle transmission, the ISG rotation speed may decrease regardless of the vehicle speed. However, torque limitation is also applied when the rotation speed decreases. Torque assist can be performed while applying.

  In short, according to the assist torque map described above, excessive torque in the inverter 22 can be provided by providing torque limitation in the rotation speed range near zero while reducing the fuel consumption by enabling torque assist in a wide area. The temperature rise can be suppressed. Further, it is possible to improve the robustness for various vehicle systems.

  Further, in the present embodiment, when torque assist is performed by powering driving of the rotating electrical machine 21, the time during which the torque assist is continuously driven is defined as the assist continuation time Tx. As a result, under the situation where a request for torque assist is generated with respect to the rotating electrical machine 21, the torque assist is temporarily suspended every time the assist duration time Tx elapses. It is supposed to be resumed. Due to the temporary stop of the torque assist, the problem of heat caused by the power running drive of the rotating electrical machine 21 being continuously performed over a long time is suppressed. In the present embodiment, the assist duration time Tx is determined as a constant value (for example, 20 seconds). However, as shown in FIG. 4, the assist duration time Tx can be set based on the switch temperature of the inverter 22. In FIG. 4, when the switch temperature is equal to or higher than a predetermined value, a relationship is set such that the assist duration time Tx is set to a short time. It should be noted that the temperature of the rotating electrical machine 21 (stator temperature) can be used instead of the switch temperature of the inverter 22, or the environmental temperature (ECU temperature or outside air temperature) can also be used in combination. The assist duration time Tx may be set.

  The pause time after the assist duration time Tx has elapsed may be set as a predetermined time in advance, for example. For example, the pause time is about 5 to 20 seconds. This pause time is provided in order to prevent overheating (protection) of the switches Sp and Sn of the inverter 22 and the switches 31 and 32 of the battery unit U, and the conditions relating to the switch temperature, that is, the actual temperatures of the switches described above. It may be variably set based on (temperature detection value) or environmental temperature (outside air temperature).

  Incidentally, the time for which the rotating electrical machine 21 is driven to start the engine, that is, the time required for starting the engine is, for example, less than 1 second and is a relatively short time. Considering this point, even if the assist continuation time Tx (powering drive continuation time) is applied at the time of engine start, continuous powering drive of the rotating electrical machine 21 is allowed until the engine start is completed. .

  FIG. 5 is a flowchart showing a procedure related to control for driving the rotating electrical machine 21 to power running, and this processing is performed by the rotating electrical machine ECU 23 at a predetermined cycle based on a drive command from the engine ECU 40. In the engine ECU 40, in response to a restart request or a torque assist request for the engine 42, a drive command for performing power running drive is output to the rotating electrical machine ECU 23. The rotating electrical machine ECU 23 that performs this process corresponds to a “first control unit” and a “second control unit”.

  In FIG. 5, in step S <b> 11, it is determined whether or not an execution condition for powering the rotating electrical machine 21 is established. Specifically, it is determined that the power supply voltage is not excessively decreased, the temperature is not outside a predetermined range, and no failure has occurred. If the execution condition is satisfied, the process proceeds to step S12. When the execution condition of step S11 is not satisfied, a signal to that effect is transmitted from rotating electrical machine ECU 23 to engine ECU 40.

  In step S <b> 12, it is determined whether or not the current drive command is an engine start command for the rotating electrical machine 21. And if it is an engine start command, step S12 will be affirmed and it will progress to step S13, and if it is a torque assist command, step S12 will be denied and it will progress to step S14.

  In step S13, using the starting torque map shown in FIG. 3A, the ISG torque at the time of starting the engine is set based on the ISG rotation speed. In step S14, the ISG torque at the time of torque assist is set based on the ISG rotation speed using the assist torque map shown in FIG. After calculating the ISG torque at the time of torque assist, an assist duration time Tx is set in step S15. In this case, for example, the assist duration time Tx is set based on the switch temperature of the inverter 22.

  Thereafter, in step S16, a target value of the energization current of the inverter 22 is calculated based on the ISG torque set in steps S13 and S14, and current feedback control is performed based on the target value. At this time, the current command value is calculated according to the deviation between the target value of the energization current in the inverter 22 and the detected current value, and the switches Sp and Sn of the inverter 22 are duty cycle with the duty ratio according to the current command value. Be controlled.

  FIG. 6 is a time chart showing more specifically the control for powering the rotating electrical machine 21. In FIG. 6, the engine start mode is initially set, and the engine shifts to the torque assist mode when the engine start is completed.

  In FIG. 6, before the timing t1, the engine 42 is in an automatically stopped state, and the ISG rotation speed is zero. When the restart condition is satisfied at the timing t1, the engine is restarted by the power running drive of the rotating electrical machine 21 based on the engine start command signal (restart request) from the engine ECU 40. At this time, the ISG torque is calculated using the starting torque map, and the ISG rotation speed is increased by driving the rotating electrical machine 21 based on the ISG torque. The ISG torque is limited at the beginning of start-up and then reduced as the ISG rotational speed increases.

  At timing t2, the driving of the rotating electrical machine 21 is switched from the start mode to the torque assist mode based on the torque assist command signal from the engine ECU 40. Note that in the rotating electrical machine ECU 23, the start mode is terminated in addition to the engine start command from the engine ECU 40 being turned off, in addition to the ISG rotation speed exceeding the upper limit rotation speed Nmax, or the start mode duration time. May exceed the predetermined time. After timing t2, the torque map is switched from the starting torque map to the assist torque map. After timing t2, torque assist by powering drive of the rotating electrical machine 21 is performed. Thereafter, at timing t3, the acceleration of the vehicle is started as the accelerator is turned on. At this time, the ISG rotation speed increases, and the ISG torque is reduced accordingly.

  According to the embodiment described in detail above, the following excellent effects can be obtained.

  An engine system that performs engine start and torque assist by the rotating electrical machine 21 is configured to use a start torque map (first correlation data) for engine start and an assist torque map (second correlation data) for torque assist. . Here, since the assist torque map includes the first range A1 of the starting torque map and is determined in the second range A2 that is wider than the first range A1, the engine torque is continuously started by the power running drive of the rotating electrical machine 21. Thus, it is possible to perform torque assist by powering driving of the rotating electrical machine 21.

  Comparing the engine start time and the torque assist time, when the engine is started, the rotating electrical machine 21 is driven in a relatively short period of time, so that the switch 22 is energized in a relatively short time in the inverter 22 and the like. On the other hand, at the time of torque assist, the rotating electrical machine 21 is driven in a longer period than when the engine is started, and the switch 22 is energized in a relatively long time in the inverter 22 and the like. In this case, there is a concern that the temperature of the inverter 22 or the like may increase excessively during torque assist. In this respect, in the assist torque map, the ISG torque with respect to the ISG rotation speed is determined to be smaller than the starting torque map. Thereby, the power running drive of the rotary electric machine 21 can be appropriately performed while taking into consideration the influence of heat caused by continuing torque assist.

  In the assist torque map, the ISG torque is reduced as the ISG rotation speed increases, while the ISG torque is limited in the low rotation speed region C on the lower rotation side than the predetermined rotation speed. Thereby, even if the rotary electric machine 21 is power-running in the low rotation speed region C, the occurrence of problems due to heat can be suppressed.

  In the assist torque map, the ISG torque at the upper limit rotation speed Nmax in the first range A1 is determined as a value higher than the low rotation side and the high rotation side of Nmax. As a result, the ISG torque can be suitably limited on the lower rotation side (for example, in the idling operation state) than the upper limit rotation speed Nmax. Can be suppressed.

  When the rotating electrical machine 21 starts the engine, the ISG torque is limited to a predetermined value or less when the ISG rotational speed is in a torque limiting region that is a predetermined low rotational speed region including zero. As a result, the energization current of the inverter 22 is limited, and as a result, the inrush current is limited. Therefore, it is possible to suppress erroneous determination that the inrush current generated at the beginning of driving of the rotating electrical machine 21 is an overcurrent.

  At the time of torque assist, the torque assist is temporarily suspended every time a predetermined assist duration Tx elapses. Thereby, the problem of the heat resulting from the power running drive of the rotary electric machine 21 being continuously implemented over a long time can be suppressed.

(Other embodiments)
You may change the said embodiment as follows, for example.

  In the engine ECU 40, a drive command for the rotating electrical machine 21 may be generated in response to an acceleration request associated with the accelerator being turned on. In this case, torque assist by powering driving of the rotating electrical machine 21 is performed with the accelerator on. Further, torque assist is performed during the accelerator-on period, and torque assist is terminated when the accelerator is off.

  -It is good also as a structure which controls an ISG torque using an assist torque map (2nd correlation data) in the state which stopped or restrict | limited the fuel injection to the engine 42 in the idle driving state of the engine 42. In other words, the engine 42 is configured to realize an idle operation state by the power running drive of the rotating electrical machine 21.

  FIG. 7 is a flowchart showing a procedure for drive control of the rotating electrical machine 21 during idle operation, and this processing is performed by the rotating electrical machine ECU 23 at a predetermined cycle based on a drive command from the engine ECU 40.

  In FIG. 7, in step S <b> 21, it is determined whether or not an execution condition for powering the rotating electrical machine 21 is established (similar to step S <b> 11 in FIG. 5). If the execution condition is satisfied, the process proceeds to step S22. In step S22, it is determined whether or not the current drive command is an idle drive command for causing the engine 42 to idle. And if it is an idle drive command, it will progress to Step S23. In step S23, the target value of the ISG rotational speed is set to realize the idle rotational speed (for example, 650 rpm) as the engine rotational speed, and the ISG torque is set based on the target value of the ISG rotational speed using the assist torque map. To do. At this time, idling can be performed by powering driving of the rotating electrical machine 21 in a state where the fuel injection by the fuel injection valve is stopped in the engine 42. Alternatively, it is possible to perform idle rotation by powering driving of the rotating electrical machine 21 with the fuel injection amount reduced. The ISG torque may be set as appropriate depending on which of these.

  Thereafter, in step S24, a target value of the energization current of the inverter 22 is calculated based on the ISG torque set in step S23, and current feedback control is performed based on the target value.

  According to the above configuration, the engine 42 can be appropriately put into the idle operation state while reducing the fuel consumption in the engine 42. In addition, if torque limitation is performed in the low rotational speed region as described above, the problem of heat can be suppressed even in an idle state where the rotational speed is relatively low. Note that when the accelerator is off (idle operation state), low-speed traveling of the vehicle (so-called EV creep traveling) may be performed by powering driving of the rotating electrical machine 21.

  In the power supply system shown in FIG. 1, the power supply unit includes a lead storage battery 11 and a lithium ion storage battery 12 connected in parallel to the inverter 22, and a switch 31 that opens and closes a path between the inverter 22 and the lead storage battery 11. And a switch 32 that opens and closes a path between the inverter 22 and the lithium ion storage battery 12. In such a system, the torque assist is performed when one of the switches 31 and 32 is closed and the torque assist is performed when both the switches 31 and 32 are closed. You may make it differ.

  FIG. 8 is a flowchart showing the procedure of drive control of the rotating electrical machine 21, and this process is a modification of part of the process of FIG. 5 described above. In FIG. 8, the same processes as those in FIG. 5 are denoted by the same step numbers and the description is simplified.

  In FIG. 8, a part of the control at the time of torque assist is changed. That is, when a torque assist command is generated, the ISG torque is set using the assist torque map, and the assist duration time Tx is set (steps S14 and S15). Thereafter, in step S31, it is determined whether or not only one of the switches 31 and 32 of the battery unit U is currently closed (ON). If only one of the switches 31, 32 is closed, the process proceeds to step S32. In step S32, the ISG torque set in step S14 is reduced and corrected. If both switches 31 and 32 are closed, step S32 is skipped. At this time, the ISG torque is different between the case where one of the switches 31, 32 is closed and the case where both the switches 31, 32 are closed, and the case where one of the switches 31, 32 is closed is the ISG. The torque is set to a small value. Thereafter, current feedback control is performed (step S16).

  When torque assist is performed by the rotating electrical machine 21, it is necessary to consider the heat problem associated with energization of the switches 31 and 32 of the battery unit U. Further, considering the power supply from each storage battery 11, 12 to the rotating electrical machine 21, the current flowing through each switch 31, 32 in the case where power supply is performed from one storage battery and the case where power supply is performed from both storage batteries. Since the sizes are different, the degree of influence of heat is different. In this respect, the ISG torque is different between when the torque assist is performed with one of the switches 31 and 32 closed and when the torque assist is performed with both the switches 31 and 32 closed. Therefore, the switches 31 and 32 can be suitably protected regardless of whether the switches 31 and 32 are opened or closed.

  The assist duration time Tx may be set based on the ISG rotation speed, and the power running drive of the rotating electrical machine 21 may be temporarily stopped every time the assist duration time Tx elapses. That is, at the time of torque assist by the rotating electrical machine ISG, the degree of influence of heat at the inverter 22 or the like differs depending on the ISG rotation speed. Taking this point into account, the assist duration time Tx is set based on the ISG rotation speed. For example, the assist duration time Tx is set using the relationship shown in FIG. In FIG. 9, when the ISG rotation speed is low, a relationship is set such that the assist continuation time Tx is shorter than when the ISG rotation speed is high. Specifically, if the ISG rotation speed is in the low rotation speed region near zero, for example, Tx = 1 second, and if the ISG rotation speed is higher than the upper limit rotation speed Nmax, Tx = 20 seconds. Further, in the intermediate portion, the assist duration time Tx is determined stepwise according to the ISG rotation speed.

  The assist duration time Tx is set as a shorter time when the ISG rotation speed is low than when it is high. Thereby, even if the degree of the influence of heat in the inverter 22 is different according to the ISG rotation speed, it can be suitably dealt with. Note that the assist duration time Tx may not be set.

  In the above embodiment, the lead storage battery 11 is provided as the first power storage unit and the lithium ion storage battery 12 is provided as the second power storage unit. However, this may be changed. As the second power storage unit, a high-density storage battery other than the lithium ion storage battery 12, for example, a nickel-hydrogen battery may be used. In addition, a capacitor can be used as at least one of the power storage units.

  -Application other than a power supply system having two power storage units is also possible. For example, the configuration having only the lead storage battery 11 or the configuration having only the lithium ion storage battery 12 may be used as the power storage unit.

  -It is also possible to use the power supply system to which this invention is applied for uses other than a vehicle.

  DESCRIPTION OF SYMBOLS 11 ... Lead storage battery, 12 ... Lithium ion storage battery, 21 ... Rotary electric machine, 22 ... Inverter (switching circuit part), 23 ... Rotary electric machine ECU (rotary electric machine control apparatus), 42 ... Engine.

Claims (9)

The engine (42), the rotating electric machine (21) that is drivingly connected to the rotating shaft of the engine and capable of powering driving, and the plurality of switches (Sp, Sn) connected to the power source (11, 12) are turned on and off. A switching circuit unit (22) for energizing each phase in the rotating electrical machine, and applied to an engine system that performs start of the engine and torque assist that assists the torque of the engine by powering driving of the rotating electrical machine A rotating electrical machine control device (23),
A first control unit that controls torque of the rotating electrical machine using first correlation data at the time of starting the engine;
A second control unit that controls the torque of the rotating electrical machine using second correlation data when the torque assist is performed;
With
The first correlation data is obtained by defining a relationship between the rotational speed and torque of the rotating electrical machine in a first range including a starting rotational speed range used when starting the engine.
In the second range including the first range and wider than the first range, the second correlation data includes a relationship between a rotational speed and a torque of the rotating electrical machine, and a torque with respect to the rotational speed is greater than the first correlation data. Is a rotary electric machine control device that is determined to be a small value.   The second correlation data reduces the torque as the rotational speed of the rotating electrical machine increases, while limiting the torque in a low rotational speed region on a lower rotational side than the predetermined rotational speed. The rotating electrical machine control device according to claim 1, wherein the relationship is defined.   The second correlation data indicates that the torque of the rotating electrical machine at a predetermined rotational speed higher than the rotational speed corresponding to the idle rotational speed of the engine in the first range is lower than the predetermined rotational speed and The rotating electrical machine control device according to claim 1 or 2, wherein the rotating electrical machine control device is defined as a value higher than that on a high rotation side.   The said 2nd control part controls the torque of the said rotary electric machine using the said 2nd correlation data in the state which stopped or restrict | limited the fuel injection to the said engine in the idle driving | running state of the said engine. The rotating electrical machine control device according to any one of the above.   The first control unit limits the torque of the rotating electrical machine to a predetermined value or less when the engine is started and the rotational speed of the rotating electrical machine is in a torque limiting range that is a predetermined low rotational speed range including zero. The rotating electrical machine control device according to any one of claims 1 to 4. Applied to a system that determines that an overcurrent has flowed in at least one of the rotating electrical machine and the switching circuit unit based on the energization current flowing through the switching circuit unit rising to a predetermined overcurrent threshold,
The first control unit limits the torque of the rotating electrical machine to a predetermined value or less when the engine is started and the rotational speed of the rotating electrical machine is in a torque limiting range that is a predetermined low rotational speed range including zero. The rotating electrical machine control device according to any one of claims 1 to 4.   The rotating electrical machine control according to any one of claims 1 to 6, wherein the second control unit temporarily suspends the torque assist whenever a predetermined assist duration time elapses when the torque assist is requested. apparatus. A setting unit that sets the assist duration as a shorter time than when the rotation speed of the rotating electrical machine is low,
8. The rotating electrical machine control device according to claim 7, wherein the second control unit performs the torque assist pause according to the assist duration set by the setting unit when the torque assist is requested. The power supply unit includes a first power storage unit (11) and a second power storage unit (12) connected in parallel to the switching circuit unit, and a path between the switching circuit unit and the first power storage unit. Applied to a system provided with a first switch (31) that opens and closes and a second switch (32) that opens and closes a path between the switching circuit unit and the second power storage unit,
In the second control unit, when the torque assist is performed in a state where one of the first switch and the second switch is closed, both the first switch and the second switch are closed. The rotating electrical machine control device according to any one of claims 1 to 8, wherein the torque of the rotating electrical machine is made different when the torque assist is performed in a state.

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