WO2016163458A1

WO2016163458A1 - Electromotive power-generator device

Info

Publication number: WO2016163458A1
Application number: PCT/JP2016/061400
Authority: WO
Inventors: 金千代寺田
Original assignee: 株式会社デンソー
Priority date: 2015-04-07
Filing date: 2016-04-07
Publication date: 2016-10-13
Also published as: JP2016201860A; CN107534409B; CN107534409A; JP6421681B2

Abstract

In the present invention, windings (7U-7W) are provided with respective intermediate taps (8U-8W) so as to allow a rotating electrical machine (4) of an electromotive power-generator device (1) to vary actual turn count by phase. A drive circuit (5) has a plurality of inverter circuits (5a, 5b) that are connected to the windings (7U-7W), and, by executing an inverter operation, a control means (6) alters actual turn count by phase. Consequently, actual turn count can be rapidly increased/decreased by phase, and, as a result, the output of an electrical motor or of a power generator can be rapidly altered and the action of the rotating electrical machine (4) can be rapidly switched between the electrical motor and the power generator. Thus, the fuel consumption reduction effects of the electromotive power-generator device (1) can be improved.

Description

Motor generator equipment

Cross-reference of related applications

This application is based on Japanese Patent Application No. 2015-078197 filed on April 7, 2015, the contents of which are incorporated herein by reference.

The present disclosure relates to a motor generator device for a vehicle that includes a rotating electric machine and assists the output of an internal combustion engine or charges a battery.

Conventionally, there is an electric motor device that drives an object to be driven by operating a rotating electric machine as an electric motor. In such an electric motor device, in order to enable optimal control according to the load to be driven, the number of turns in the portion of the winding that is energized by power feeding from the battery (hereinafter referred to as the actual number of turns). Has been disclosed that can be changed for each phase by a relay switch (see, for example, Patent Documents 1 and 2).

Thus, for example, when torque output at low speed is required, the number of actual turns per phase is increased to provide high torque output, and when torque output at high speed is required, the number of actual turns per phase is reduced. This makes it possible to operate as an electric motor.
In the motor generator device for a vehicle, the rotating electrical machine is operated as an electric motor in order to assist the output of the internal combustion engine and contribute to the reduction of fuel consumption. In this case, it is conceivable to introduce a configuration in which the actual number of turns per phase is made variable by changing the actual number of turns per phase.

By the way, in driving a vehicle, there are many factors that affect fuel consumption, such as the load of an internal combustion engine and the voltage of a battery. The numerical values of these factors are extremely fluid and variable due to many disturbance factors such as road conditions and driver operations. Moreover, in the motor generator device for vehicles, it is necessary to switch operation | movement of a rotary electric machine between an electric motor and a generator.

For this reason, in the aspect using the relay switch as described above to operate the actual number of turns for each phase, the relay switch cannot be operated at high speed in terms of the number of on / off lifetimes, etc. Responsiveness to is reduced. For this reason, there has been a problem that the operation of the relay switch cannot follow an operating state that changes fluidly and variably, and a sufficient fuel consumption reduction effect cannot be achieved.

Patent Document 3 discloses a configuration in which the maximum torque of the starter motor, which is a rotating electrical machine, is set to 60% or less of the “compression overriding maximum cranking torque” in the engine starting device. However, this configuration is intended to improve the drivability by reducing the inertia mass, and is not considered to contribute much to the reduction in fuel consumption.

JP 2014-058825 A Japanese Patent No. 3968673 Japanese Patent No. 40396604

An object of the present disclosure is to enhance a fuel consumption reduction effect in a motor generator device for a vehicle including a rotating electrical machine in which the actual number of turns for each phase is variable.

In the first aspect of the present disclosure, the motor generator device assists the output of the internal combustion engine by generating an output by supplying power from a battery, or a voltage induced by the output of the internal combustion engine (hereinafter referred to as an induced voltage). The battery is charged for the vehicle. The motor generator apparatus includes the following rotating electric machine, drive circuit, and control means.

First, the rotating electrical machine operates as an electric motor that assists the output of the internal combustion engine or a generator that charges a battery. In the rotating electrical machine, an intermediate tap is provided in each phase winding so that the actual number of turns, which is the number of turns in a portion energized by power supply from the battery, is variable for each phase. Further, the drive circuit has a plurality of inverter circuits connected to the windings of each phase, and some inverter circuits are connected to the intermediate tap.

Furthermore, the control means controls the operation of the rotating electrical machine by executing the following inverter operation. In other words, the inverter operation is to select one that is sequentially turned on or off from among the semiconductor switches of a plurality of inverter circuits and to change the semiconductor switch to be sequentially selected. And a control means changes the number of real turns for every phase by performing inverter operation.

As a result, the number of actual turns can be increased or decreased at high speed for each phase, so the output of the motor or generator can be changed at high speed, or the operation of the rotating electrical machine can be switched between the motor and generator at high speed. can do. For this reason, in the motor generator device for vehicles, it can follow the driving state of the vehicle which changes fluidly and variably, and can improve the fuel consumption reduction effect.

The above and other objects, features, and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. The drawing
FIG. 1 is an overall configuration diagram illustrating a motor generator device according to a first embodiment. FIG. 2A is a transition diagram showing transition of on / off of the switch in the large mode operation of the first embodiment; FIG. 2B is a table showing an example of combinations of switches that are turned on or off in the inverter operation of the first embodiment, and output magnitudes; FIG. 3A is a diagram showing the correlation between the rotational speed and the torque when the rotating electrical machine of the first embodiment is operated as an electric motor, and FIG. 3B is the rotation of the first embodiment. It is a diagram showing the correlation between the rotational speed and the generated current when the electric machine is operated as a generator, FIG. 4 is a characteristic diagram showing an operation example of the motor generator device of the first embodiment. FIG. 5 is an overall configuration diagram of the motor generator device of the second embodiment. FIG. 6 is a time chart showing the switching transition of the electric motor and the generator for each stroke of the internal combustion engine of the second embodiment, FIG. 7 is a block diagram illustrating a part of the function of the control unit in the first embodiment. FIG. 8 is a block diagram for explaining a part of the functions of the control unit in the second embodiment.

Hereinafter, modes for carrying out the invention will be described using examples. In addition, an Example discloses a specific example, and it cannot be overemphasized that this invention is not limited to an Example.

[First embodiment]
The configuration of the motor generator device 1 according to the first embodiment will be described with reference to FIG.
A motor generator device (hereinafter referred to as a system) 1 is provided in a vehicle and generates an output by power feeding from an on-vehicle battery (hereinafter simply referred to as a battery) 2 to start the internal combustion engine 3. Or assisting the output of the internal combustion engine 3 or charging the battery 2 with a voltage induced by the output of the internal combustion engine 3.
And the system 1 is provided with the rotary electric machine 4, the drive circuit 5, and the control part 6 (functioning as a control means), as shown in FIG.

First, the rotating electrical machine 4 operates as an electric motor that starts the internal combustion engine 3 or assists the output of the internal combustion engine 3 or a generator that charges the battery 2. In the rotating electrical machine 4, for example, U-phase, V-phase, and W-

phase windings

7U, 7V, and 7W are star-connected to a stator, and a permanent magnet is built into the rotor. Note that the rotor of the rotating electrical machine 4 is directly connected to the crankshaft of the internal combustion engine 3.

Further, in the rotating electrical machine 4, the number of actual turns is made variable for each phase by providing

intermediate taps

8U, 8V, 8W on the

windings

7U, 7V, 7W.
Here, the actual number of turns refers to the number of turns in each of the

windings

7U, 7V, and 7W that is energized by power feeding from the battery 2 in the operation as an electric motor, or the induced voltage in the operation as a generator. Is the number of turns of the portion that supplies to the battery 2.

In addition, in the windings 7U to 7W of the rotating electrical machine 4, the resistance value of a portion that is energized by power supply from the battery 2 in the operation as an electric motor or a portion that supplies an induced voltage to the battery 2 in the operation as a generator. It is variable for each phase, and the current value is variable.

Specifically, in the winding 7U, two windings 7U1 and 7U2 are connected in series, and an intermediate tap 8U is provided at a connection portion between the winding 7U1 and the winding 7U2. Similarly, in the winding 7V, two windings 7V1 and 7V2 are connected in series, and an intermediate tap 8V is provided at a connection portion between the winding 7V1 and the winding 7V2. In the winding 7W, two windings 7W1 and 7W2 are connected in series, and an intermediate tap 8W is provided at a connection portion between the winding 7W1 and the winding 7W2. Thereby, in the rotary electric machine 4, the actual number of turns is variable for each phase, and the actual number of turns of all phases can be changed by the drive circuit 5 as described later.

Further, terminals of the windings 7U2, 7V2, and 7W2 that do not form the

intermediate taps

8U, 8V, and 8W are connected as a neutral point and star-connected.
In the following description, terminals on which the intermediate taps 8U, 8V, and 8W are not formed in the windings 7U1, 7V1, and 7W1 are referred to as a U terminal 9U, a V terminal 9V, and a W terminal 9W, respectively. In addition, the number of turns of the windings 7U1, 7U2, 7V1, 7V2, 7W1, and 7W2 are all the same integer n and the same resistance value for the sake of simplicity.

Further, the rotary electric machine 4 is provided with a position sensor 4a for detecting the magnet position of the rotor. The position sensor 4a is composed of three hall sensors PU, PV, and PW arranged at the stator pole intervals.

Next, the drive circuit 5 includes two

inverter circuits

5a and 5b.
Each of the

inverter circuits

5a and 5b is a three-phase bridge circuit in which two semiconductor switches S are connected in series, and three series connections of two semiconductor switches S are connected in parallel (hereinafter referred to as semiconductor switch S). Is referred to as a switch S).

In one inverter circuit 5a, one terminal connected in series is connected to the positive electrode of the battery 2, and the other terminal is connected to the ground. Further, the three midpoints of the series connection are connected to the U terminal 9U, the V terminal 9V, and the W terminal 9W, respectively. In the other inverter circuit 5b, one terminal connected in series is connected to the positive electrode of the battery 2, and the other terminal is connected to the ground. Further, the three midpoints of the series connection are connected to the

intermediate taps

8U, 8V, and 8W, respectively.

A smoothing capacitor 10 is connected in parallel to the

inverter circuits

5a and 5b. The switch S is, for example, an N channel type power MOSFET.
In the following description, regarding the two switches S included in the three series connections of the inverter circuit 5a whose middle point is connected to the U terminal 9U, the switch Sup1, Sometimes called Sun1. Further, regarding the two switches S included in the middle point connected to the V terminal 9V, the high potential side switch S and the low potential side switch S may be referred to as switches Svp1 and Svn1, respectively. Further, regarding the two switches S included in the middle point connected to the W terminal 9W, the high potential side switch S and the low potential side switch S may be referred to as switches Swp1 and Swn1, respectively.

Similarly, regarding the two switches S included in the three serial connections of the inverter circuit 5b whose middle point is connected to the intermediate tap 8U, the high potential side switch S and the low potential side switch S are respectively referred to as switches Sup2 and Sun2. Sometimes called. Regarding the two switches S included in the middle point connected to the intermediate tap 8V, the high-potential side and low-potential side switches S may be referred to as switches Svp2 and Svn2, respectively. Further, regarding the two switches S included in the middle point connected to the intermediate tap 8W, the high potential side switch S and the low potential side switch S may be referred to as switches Swp2 and Swn2, respectively.

Next, the control unit 6 (control means) is an electronic control unit (ECU: Electronic Control Unit) that controls the operation of the rotating electrical machine 4. The control unit 6 includes, for example, an input circuit 6A that processes an input signal, a CPU (Central Processing Unit) 6B that performs control processing and arithmetic processing based on the input signal, and is necessary for control processing and arithmetic processing. Various memories 6C for storing and holding various data, programs, etc., an output circuit 6D for outputting necessary signals based on the processing results of the CPU, and the like.

And the control part 6 controls operation | movement of the rotary electric machine 4 by performing the next inverter operation according to the output of the position sensor 4a. That is, the inverter operation is to determine which one of the 12 switches S included in the

inverter circuits

5a and 5b is to be sequentially turned on or off and to drive the switch S that is to be sequentially turned on or off. .

And the control part 6 changes the number of real turns for every phase by performing inverter operation. More specifically, the control unit 6 selects from three numerical values of 2n, 3n, and 4n regarding the actual number of turns in all phases in the inverter operation.
For example, when power is supplied to the windings 7U and 7V in the operation as an electric motor, if the switches Sup1 and Svn1 are selected to be turned on, the windings 7U1, 7U2, 7V1 and 7V2 are supplied with power from the battery 2, The actual number of turns for each V phase is 2n and 2n, and the actual number of turns for all phases is 4n.

If the switches Sup2 and Svn2 are selected to be turned on, the windings 7U2 and 7V2 are supplied with power from the battery 2, so that the actual number of turns for the U phase and the V phase are n and n, respectively. Is 2n.
If the switches Sup1 and Svn2 are selected to be turned on, the windings 7U1, 7U2 and 7V2 are supplied with power from the battery 2, so that the actual number of turns of the U phase and V phase is 2n and n, respectively. The number of turns is 3n.

Further, if the switches Svn1 and Sup2 are selected to be turned on, the windings 7U2, 7V1 and 7V2 are supplied with power from the battery 2, so that the actual number of turns of the U phase and V phase is n and 2n, respectively. The number of turns is 3n.
Hereinafter, in the inverter operation, the actual number of turns in all phases when voltage is applied from the battery 2 to the two phases of the three-phase windings 7U to 7W or the induced voltage is supplied to the battery 2 from the two phases. The modes for selecting 4n, 2n, and 3n are referred to as a large mode, a small mode, and a medium mode, respectively.

Here, FIG. 2A shows the on / off transition of the switch S in the large mode operation as the electric motor, with the rotational speed Ne of the internal combustion engine 3 as the horizontal axis, and FIG. 2B shows the large, small, medium In each mode, an example of a combination of 12 switches S that are turned on or off is shown.

That is, in the operation as the electric motor in the large mode and the small mode, the first to third patterns and the fourth to sixth patterns are sequentially repeated according to the signal of the position sensor 4a, respectively. In the middle mode, the seventh to ninth patterns or the tenth to twelfth patterns are sequentially repeated. In the middle mode, for example, a group of the seventh to ninth patterns and a group of the tenth to twelfth patterns are alternately arranged as in the seventh pattern → the eleventh pattern → the ninth pattern → the tenth pattern →. By repeating, the heat generation of the windings 7U to 7W and the switch S can be dispersed and suppressed.

Further, the correlation between the rotational speed and the torque when the rotating electrical machine 4 is operated as an electric motor, and the correlation between the rotational speed and the generated current when the rotating electrical machine 4 is operated as a generator are large, medium, and small. In each mode, for example, as shown in FIG.

According to FIG. 3, in the operation as an electric motor, the large mode is suitable for assist when the internal combustion engine 3 is started or when the rotational speed of the internal combustion engine 3 is in a low speed rotation range (for example, up to about 2500 rpm). . Further, the middle mode is suitable for assist when the rotation speed of the internal combustion engine 3 is in a medium speed rotation range (for example, from 2000 rpm to around 3500 rpm). Further, the small mode is suitable for assist when the rotation speed of the internal combustion engine 3 is in a high rotation range (for example, from 3000 rpm to around 5500 rpm). Of the windings 7U to 7W, the induced voltage in the winding that is not supplied with power from the battery 2 during operation as a middle mode or small mode motor can be used for charging the battery 2 or short-circuited as described later. May be.

Further, according to FIG. 3, in the operation as a generator, in the large mode, the battery 2 can be charged from the rotational speed range (for example, around 800 rpm) where the rotational speed of the internal combustion engine 3 is low. Further, the medium mode is suitable for charging the battery 2 from the medium speed rotation region (for example, around 3000 rpm) because the generated current is reduced by reducing the actual number of turns. In addition, the small mode is suitable for charging the battery 2 from a high rotation range (for example, around 5000 rpm) because the generated current is further reduced by further reducing the actual number of turns.

Further, the system 1 includes a next rotation speed detector 12 (functioning as a rotation speed detection means) and a voltage detector 13 (functioning as a voltage detection means) (see FIG. 1).
First, the rotational speed detector 12 detects the rotational speed of the internal combustion engine 3 and is, for example, a crank angle sensor having a known structure for detecting the crank angle of the internal combustion engine 3. In other words, the rotational speed detector 12 detects the crank angle with a protrusion provided on the outer periphery of the crankshaft, and is used for ignition control and fuel injection control of the internal combustion engine 3.
Next, the voltage detector 13 detects the voltage of the battery 2, and is provided as an A / D conversion circuit having a known structure, for example.

Then, the control unit 6 executes the inverter operation by selecting one of the large, small, and medium modes according to the detection values of the rotation speed detector 12 and the voltage detector 13, so that the rotating electrical machine 4 is driven by the electric motor. Or operate as a generator.
First, the control unit 6 makes a determination based on the charging balance of the battery 2 predicted using the change over time of the detection value by the voltage detector 13 or the detection value by the voltage detector 13 when the internal combustion engine 3 is started. Whether or not the rotating electrical machine 4 is operated as an electric motor is determined according to the state of charge of the battery 2 (see FIG. 7, block S1). FIG. 7 illustrates a part of the functions executed by the control unit 6. The CPU 6B is functionally realized by reading out and executing the control program given in the first embodiment from the memory 6C. Is done.

Specifically, when the estimated charge balance of the battery 2 is negative, or when the detected value of the voltage of the battery 2 when starting the internal combustion engine 3 is lower than the reference value, the control unit 6 Therefore, the rotating electrical machine 4 is controlled to operate as a generator for a predetermined period, and the rotating electrical machine 4 is not operated as an electric motor. That is, the control unit 6 determines the actual number of turns so that the voltage induced in the windings 7U to 7W is higher than the voltage of the battery 2.

Next, the control unit 6 has two threshold values (a first threshold value C1 and a second threshold value C2) set in advance with respect to the rotational speed of the internal combustion engine 3. Among these, as shown in FIG. 3A, the first threshold C1 is set to a rotational speed at which the torque of the large mode torque curve becomes zero as an example when the rotating electrical machine 4 is operated as an electric motor. Yes. The first threshold C1 may be equal to or less than the number of revolutions at which this torque = 0. Similarly, as an example, the second threshold C2 is set to a rotational speed at which the torque of the medium mode torque curve = 0. The second threshold C2 may be equal to or less than the number of revolutions at which this torque = 0. It should be noted that the rotational speed that exhibits torque = 0 in the small mode is a limit rotational speed that can be rotationally driven.

Therefore, the control unit 6, that is, the CPU 6B executes the control program read from the memory 6C, thereby performing the mode control B1 for driving the

inverters

5a and 5b, and exhibits the function of determining the actual number of turns for each other. Therefore, when the rotating electrical machine 4 is operated as an electric motor, the control unit 6 performs a comparison determination between the detection value by the rotation speed detector 12 and the first and second threshold values C1 and C2 (FIG. 7, threshold comparison determination). The actual number of turns is determined for each phase according to the result of the determination (see FIG. 7, mode selection command B12).

Specifically, the control unit 6 has first and second threshold values C1 and C2 (C1 <C2) with respect to the rotational speed of the internal combustion engine 3. Then, when the value detected by the rotation speed detector 12 is smaller than the first threshold C1, the control unit 6 selects any one of the large mode, the medium mode, and the small mode and operates the rotating electrical machine 4 as an electric motor. Assist the output of the internal combustion engine 3 with the output of low speed and high torque.

Further, the control unit 6 selects the medium mode or the small mode when the value detected by the rotation speed detector 12 is equal to or greater than the first threshold C1 and smaller than the second threshold C2, and the rotating electrical machine 4 is selected. Is operated as an electric motor, and the output of the internal combustion engine 3 is assisted by the output of the medium-speed medium torque.
Further, the control unit 6 employs the small mode when the value detected by the rotation speed detector 12 is equal to or higher than the threshold C2 and is equal to or lower than the limit frequency, and operates the rotating electrical machine 4 as an electric motor. Thereby, the internal combustion engine 3 is assisted with a high-speed and low-torque output.

Further, the control unit 6 controls the charging of the battery 2 by the parasitic diode associated with the switch S that is not selected to be turned on in the inverter operation other than the large mode (see FIG. 7, charging control B2). For example, when the fourth pattern is selected, the switches S selected to be turned on are the switches Sup2, Swp2, and Svn2, and the windings 7U2, 7V2, and 7W2 are supplied with power from the battery 2. Therefore, for example, the voltage induced in the winding 7U1 can be charged to the battery 2 by a parasitic diode associated with the switch Sup1 while controlling the voltage of the battery 2 by turning on and off the switch Sun1. (See, for example, the circled portion in FIG. 2A.)

Here, an example of the operating characteristics of the system 1 will be described with reference to FIG.
FIG. 4 exemplifies operating characteristics when the rotational speed of the internal combustion engine 3 changes between N1 (> first threshold C1) and N2 (> second threshold C2). In FIG. 4, the horizontal axis indicates the rotational speed Ne of the internal combustion engine 3, and the vertical axis indicates the current I flowing between the battery 2 and the drive circuit 5, and the direction of flow when operating as a generator is positive. In addition, the currents flowing as the generator and the motor are called the generated current and the motor current, respectively, and are indicated by solid lines. Furthermore, a current flowing through another electric load is called an electric load current and indicated by a dotted line.

According to FIG. 4, in the operation as the generator, the large mode is selected so that the generated current is larger than the electric load current. In the operation as an electric motor, for example, the medium mode is selected in the range where the rotational speed of the internal combustion engine 3 is smaller than the second threshold C2, and the small mode is selected in the range larger than the second threshold C2.
When the operation is observed over time, the rotational speed Ne and the current I travel between the solid line of the generated current and the solid line of the motor current.

[Effect of the first embodiment]
According to the system 1 of the first embodiment, the rotating electrical machine 4 is provided with the intermediate taps 8U to 8W in the windings 7U to 7W, respectively, so that the actual number of turns can be varied for each phase.

Further, the control unit 6 selects one that is sequentially turned on or off from the switches S that the

inverter circuits

5a and 5b have, and sequentially executes an inverter operation that changes the switch S to be selected. The operation of the rotating electrical machine 4 is controlled. Furthermore, the control part 6 changes the number of real turns for every phase by performing inverter operation.
As a result, the number of actual turns can be increased / decreased at high speed for each phase, so that the output of the motor or generator can be changed at high speed, or the operation of the rotating electrical machine 4 can be switched between the motor and generator at high speed. Can be. For this reason, in the system 1, the fuel consumption reduction effect can be enhanced. For example, the fuel consumption reduction effect can be enhanced by reducing the amount of the induced voltage generated at the time of high rotation that has conventionally been lost to the ground due to a short circuit and increasing the amount of charge to the battery 2.

Further, the system 1 includes a rotation speed detector 12 that detects the rotation speed of the internal combustion engine 3, and the control unit 6 has threshold values C1 and C2 (C1 <C2) for the rotation speed of the internal combustion engine 3, and the rotation speed. The actual number of turns is changed for each phase according to the result of comparison between the detection value by the detector 12 and the threshold values C1 and C2.
Thereby, the output of the rotary electric machine 4 can be changed at high speed with respect to the load fluctuation of the internal combustion engine 3 or the like.

The system 1 also includes a voltage detector 13 that detects the voltage of the battery 2. Then, the control unit 6 rotates based on the charge balance of the battery 2 predicted using the change over time of the detection value by the voltage detector 13 or the detection value by the voltage detector 13 when starting the internal combustion engine 3. It is determined whether or not the electric machine 4 is operated as an electric motor.
Thereby, the influence which the voltage fluctuation of the battery 2 by operating the rotary electric machine 4 as an electric motor has on other electric loads can be reduced.

Furthermore, the control unit 6 controls the charging of the battery 2 by the parasitic diode associated with the switch S that is not selected to be turned on by the inverter operation. Thereby, charging efficiency can be improved.

[Second Embodiment]
A system 1 of the second embodiment will be described. In the second embodiment, the description will focus on the configuration different from that of the system 1 of the first embodiment, and the same configurations as those described in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Simplify.

In the control unit 6 of the system 1 of the second example, the CPU 6B reads out and executes the control program according to the second embodiment in the memory 6C, as shown in FIG. I will provide a. This function also includes a stroke determination unit 15 (see FIGS. 5 and 8: functions as a stroke determination unit) that determines the stroke of the internal combustion engine 3.

The control unit 3 determines whether or not to operate the rotating electrical machine 4 as an electric motor according to the determination result by the stroke determination unit 15 according to the position of the stroke (see block B21 in FIG. 8). The stroke determination unit 15 determines the stroke of the internal combustion engine 3 based on, for example, a signal (a signal indicating a crank angle) output from the rotation speed detector 12 and a signal indicating the intake pressure of the internal combustion engine 3.

For example, when the stroke determination unit 15 determines that the stroke of the internal combustion engine 3 is at least a compression stroke or an explosion stroke, the control unit 6 operates the rotating electrical machine 4 as an electric motor. For example, as shown in FIG. 6, the rotating electrical machine 4 is operated as an electric motor in the second half of the compression stroke, the entire explosion stroke, and the first half of the exhaust stroke, in which the output assist of the internal combustion engine 3 is considered to be particularly effective. The driving feeling is optimized.

In addition, at a time other than the period in which the rotating electrical machine 4 is operated as an electric motor, the control unit 6 operates the rotating electrical machine 4 as a generator (see block B22 in FIG. 8). Moreover, the control part 6 extends or shortens the period operated as an electric motor according to the charge balance of the battery 2 (refer FIG. 8, block S23). That is, when it is expected that the amount of charge of the battery 2 will decrease too much when operated as an electric motor, the control unit 6 shortens the period for operating as an electric motor and expands the period for operating as a generator.

As described above, according to the system 1 of the second embodiment, the operation of the rotating electrical machine 4 is more finely switched between the electric motor and the generator according to the stroke of the internal combustion engine 3, thereby further reducing the fuel consumption. As well as the driving feeling of the vehicle.

[Modification]
The aspect of the present invention is not limited to the embodiments, and various modifications can be considered.
For example, according to the system 1 of the embodiment, one

intermediate tap

8U, 8V, 8W is provided for each phase. For example, two or more intermediate taps 8U to 8W are provided, and the intermediate taps 8U to 8W are provided. You may increase an inverter circuit according to the increase in the number of 8W.

Further, according to the windings 7U to 7W of the embodiment, for example, the windings 7U1 and 7U2 are connected in series in the winding 7U, and the actual number of turns of the windings 7U1 and 7U2 is assumed to be the same n. The manner of the windings 7U to 7W is not limited to this. For example, the winding 7U1 may be provided by connecting two windings having an actual number of turns n in parallel.

Further, the number of poles of the rotor and the number of stators of the rotating electrical machine 4 are not limited to 12 poles and 18 poles, which are typical for a three-phase motor generator, and a delta (Δ) connection as a winding connection system. May be adopted.
In addition, the timing of switching the operation of the rotating electrical machine 4 between the electric motor and the generator is not limited to the embodiment, and may be appropriately changed depending on the traveling feeling of the vehicle.

Further, in order to increase the engine brake at the time of deceleration or the like, the control unit 6 may execute the following short-circuit mode. That is, the short-circuit mode is a control mode in which the induced voltage of the windings 7U to 7W is short-circuited to the ground by an inverter operation, and is different from the control mode in which the rotating electrical machine 4 is operated as an electric motor or a generator.

For example, in the short-circuit mode, the switches Sun1, Svn1, and Swn1 may be turned on to short-circuit the generated current, and the switches Sun2, Svn2, and Swn2 may be turned on in addition to the switches Sun1, Svn1, and Swn1.

At this time, for example, when the generated current generated in the windings 7U1, 7U2, 7V1, and 7V2 is short-circuited, it is possible to short-circuit by turning on the switches Sun1 and Svn1, but in addition to the switches Sun1 and Svn1, the switch Sun2, By turning on Svn2, it is possible to disperse the heat generated at the time of a short circuit, and it is possible to increase the degree of short circuit of the windings and increase the braking capacity.

It should be noted that the power generation, travel assist, and engine brake may be optimized by adjusting their degrees as appropriate by PWM control or the like. Further, the short-circuit mode may be executed every set time or every set interval regardless of the stroke of the internal combustion engine 3.

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

Claims

A vehicle for assisting the output of the internal combustion engine (3) by generating an output by feeding power from the battery (2) or charging the battery (2) by a voltage induced by the output of the internal combustion engine (3) In the motor generator device (1) of
The motor operates as an electric motor for assisting the output of the internal combustion engine (3) or a generator for charging the battery (2), and the intermediate taps (8U to 8W) are provided on the windings (7U to 7W) of the respective phases. By providing the number of turns of the portion energized by the power supply from the battery (2) or the actual number of turns, which is the number of turns of the portion supplying the induced voltage to the battery (2), for each phase. A variable rotating electric machine (4),
Having a plurality of inverter circuits (5a, 5b) connected to the windings (7U to 7W) of each phase, and connecting to the intermediate tap (8U to 8W) in the inverter circuits (5a, 5b) A drive circuit (5) in which
From among the semiconductor switches (S) of the plurality of inverter circuits (5a, 5b), one that is sequentially turned on or off is selected, and an inverter operation for sequentially changing the semiconductor switch (S) to be selected is performed. Control means (6) for controlling the operation of the rotating electrical machine (4) by executing,
This control means (6) is a motor generator device (1) that changes the actual number of turns for each phase by executing the inverter operation.
In the motor generator device (1) according to claim 1,
A rotational speed detecting means (12) for detecting the rotational speed of the internal combustion engine (3);
The control means (6) has threshold values (C1, C2) for the rotational speed of the internal combustion engine (3), and compares the detected value by the rotational speed detection means (12) with the threshold values (C1, C2). The motor generator apparatus (1) which changes the said actual turn number for every phase according to the result of.
The motor generator device (1) according to claim 2,
The threshold value includes a first threshold value (C1) and a second threshold value (C2) larger than the first threshold value (C1), and the control means (6) includes the rotation speed detection means ( When the detected value by 12) is smaller than the first threshold value (C1), the rotating electrical machine (4) is operated as an electric motor to assist the output of the internal combustion engine (3) with the output of low speed and high torque, and the detection When the value is larger than the first threshold value (C1) and smaller than the second threshold value (C2), the output of the internal combustion engine (3) is assisted by the output of the medium-speed medium torque, or the detected value A motor generator device (1) that assists the internal combustion engine (3) with a high-speed, low-torque output when is greater than the second threshold value (C2).
In the motor generator device (1) according to any one of claims 1 to 3,
Stroke determination means (15) for determining the stroke of the internal combustion engine (3),
The control means (6) is a motor generator device (1) that determines whether or not to operate the rotating electrical machine (4) as the electric motor according to a result of the determination by the stroke determination means (15).
In the motor generator device (1) according to claim 4,
The motor generator device (1) in which the period during which the rotating electrical machine (4) is operated as the electric motor includes the time determined by the stroke determination means (15) as the compression stroke.
In the motor generator device (1) according to any one of claims 1 to 5,
The control means (6) changes the actual number of turns for each phase, and selects the actual number of turns for all phases from among three or more numerical values (2n, 3n, 4n). (1).
In the motor generator device (1) according to any one of claims 1 to 6,
Voltage detecting means (13) for detecting the voltage of the battery (2);
The control means (6) is a charge balance of the battery (2) predicted by using a change with time of the detection value by the voltage detection means (13), or when the internal combustion engine (3) is started. A motor generator device (1) for deciding whether or not to operate the rotating electric machine (4) as the electric motor based on a detected value by the voltage detecting means (13).
In the motor generator device (1) according to any one of claims 1 to 7,
The control means (6) is a motor generator device (1) for controlling charging of the battery (2) by a parasitic diode associated with the semiconductor switch (S) not selected to be turned on by the inverter operation.
In the motor generator device (1) according to any one of claims 1 to 8,
The motor generator device (1) having a short-circuit mode in which the control means (6) short-circuits voltages induced in the windings (7U to 7W) of the phases by the inverter operation.