CN107534409B

CN107534409B - Motor generator device

Info

Publication number: CN107534409B
Application number: CN201680020674.5A
Authority: CN
Inventors: 寺田金千代
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2015-04-07
Filing date: 2016-04-07
Publication date: 2020-03-03
Anticipated expiration: 2036-04-07
Also published as: WO2016163458A1; JP2016201860A; CN107534409A; JP6421681B2

Abstract

A rotating electrical machine (4) of a motor generator device (1) is provided with intermediate joints (8U-8W) in windings (7U-7W) respectively, so that the actual number of turns can be changed for each phase. The drive circuit (5) has a plurality of inverter circuits (5a, 5b) connected to the windings (7U-7W). In addition, the control unit (6) performs an inverter operation to make the number of turns per phase change more realistic. Thus, the actual number of turns can be increased or decreased at high speed for each phase, and therefore, the output of the motor or the generator can be changed at high speed, or the operation of the rotating electrical machine (4) can be switched between the motor and the generator at high speed. Therefore, in the motor generator device (1), the fuel consumption reduction effect can be improved.

Description

Motor generator device

Technical Field

The present disclosure relates to a motor generator device for a vehicle including a rotating electric machine and configured to assist an output of an internal combustion engine or charge a battery.

Background

Conventionally, there is a motor device that drives a driving target by operating a rotating electric machine as a motor. In this kind of motor device, the following structure is disclosed: in order to perform optimal control in accordance with the load to be driven, the number of turns (hereinafter referred to as the actual number of turns) of a portion of the winding to be energized by power supply from the battery can be changed for each phase by the relay switch (see, for example, patent documents 1 and 2).

Thus, for example, when a torque output at a low speed is required, the number of actual windings per phase is increased to obtain a high torque output, and when a torque output at a high speed is required, the number of actual windings per phase is decreased to enable an operation as a motor.

In addition, in the motor generator device for a vehicle, the rotating electric machine is also operated as a motor in order to assist the output of the internal combustion engine and contribute to a reduction in fuel consumption. In this case, a structure may be considered in which the actual number of turns per phase is operated by introducing a variable actual number of turns per phase.

In addition, factors affecting the fuel consumption rate, such as the load of the internal combustion engine and the voltage of the battery, are many during the operation of the vehicle. The values of these factors are extremely fluid and variable depending on a large number of disturbance factors such as road conditions and driver's operations. In addition, in the motor generator device for a vehicle, it is also necessary to switch the operation of the rotating electric machine between the motor and the generator.

Therefore, in the method of using the relay switch as described above when the actual number of turns per phase is operated, the relay switch cannot be operated at high speed due to the number of times of life of on/off operation and the like, and the responsiveness to the operation command is low. Therefore, there are problems as follows: the operation of the relay switch cannot be made to follow the operating state in which the fluidity and variability are changed, and a sufficient fuel consumption reduction effect cannot be achieved.

Patent document 3 discloses a configuration in which the maximum torque of a starter motor, which is a rotating electrical machine, is set to 60% or less of the "compression overload maximum starting torque" in an engine starting device. However, this structure is intended to improve drivability by reducing inertial mass, and is not considered to contribute much to reducing fuel consumption.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2014-058825

Patent document 2: japanese patent No. 3968673

Patent document 3: japanese patent No. 4039604

Disclosure of Invention

The purpose of the present disclosure is to improve the fuel consumption reduction effect in a motor generator device for a vehicle that includes a rotating electric machine with a variable number of actual turns per phase.

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 the power supplied from the battery, or charges the battery with a voltage induced by the output of the internal combustion engine (hereinafter, sometimes referred to as an induced voltage) and is used in a vehicle. The motor generator device includes the following rotating electric machine, a drive circuit, and a control unit.

First, the rotating electric machine operates as an electric motor that assists the output of the internal combustion engine or as a generator that charges a battery. The rotating electric machine enables the number of turns of a portion to be energized by power supply from the battery, that is, the actual number of turns, per phase change by providing an intermediate joint in the winding of each phase. The drive circuit includes a plurality of inverter circuits connected to the windings of the respective phases, and the inverter circuits include an inverter circuit connected to an intermediate connector.

And, the control unit controls the action of the rotating electric machine by performing the following inverter operation. That is, the inverter operation is to sequentially select a switch to be turned on or off from semiconductor switches included in a plurality of inverter circuits, and to sequentially change the semiconductor switch to be selected. Also, the control unit makes the number of turns more realistic per phase change by performing an inverter operation.

This makes it possible to increase or decrease the actual number of turns at a high speed for each phase, and thus to change the output of the motor or the generator at a high speed, or to switch the operation of the rotating electric machine between the motor and the generator at a high speed. Therefore, in the motor generator device for a vehicle, the operating state of the vehicle that changes in fluidity and variability can be followed, and the fuel consumption reduction effect can be improved.

Drawings

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. In the drawings:

fig. 1 is an overall configuration diagram showing a motor generator device according to a first embodiment.

FIG. 2A is a transition diagram showing transition of ON/OFF of a switch in the large mode operation of the first embodiment,

fig. 2B is a table showing an example of the combination of switches that are turned on or off among the switches and the magnitude of the output in the inverter operation of the first embodiment.

Fig. 3 (a) is a graph showing a correlation between the rotational speed and the torque when the rotating electrical machine of the first embodiment is operated as a motor, and fig. 3 (b) is a graph showing a correlation between the rotational speed and the generated current when the rotating electrical machine of the first embodiment is operated as a generator.

Fig. 4 is a characteristic diagram showing an operation example of the motor generator device according to the first embodiment.

Fig. 5 is an overall configuration diagram of the motor generator device of the second embodiment.

Fig. 6 is a timing chart showing transition of switching between the motor and the generator according to the stroke of the internal combustion engine in the second embodiment.

Fig. 7 is a block diagram illustrating a part of the functions of the control unit in the first embodiment.

Fig. 8 is a block diagram illustrating a part of the functions of the control unit in the second embodiment.

Detailed Description

The following examples are used to describe modes for carrying out the invention. It should be understood that the embodiments are only for the purpose of disclosing specific examples, and the present invention is not limited to the embodiments.

Examples

[ first embodiment ]

The structure of the motor generator device 1 according to the first embodiment will be described with reference to fig. 1.

The motor generator device (hereinafter, referred to as a system) 1 is provided in a vehicle, and generates an output by supplying power from a vehicle-mounted battery (hereinafter, simply referred to as a battery) 2 to start the internal combustion engine 3, assist the output of the internal combustion engine 3, or charge the battery 2 with a voltage induced by the output of the internal combustion engine 3.

As shown in fig. 1, the system 1 includes a rotating electric machine 4, a drive circuit 5, and a control unit 6 (functioning as a control means).

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 as a generator that charges the battery 2. The rotating electric machine 4 is, for example, a motor in which 3-

phase windings

7U, 7V, and 7W of U-phase, V-phase, and W-phase are star-connected to a stator and a permanent magnet is incorporated in a rotor. Further, the rotor of the rotating electrical machine 4 is directly coupled to the crankshaft of the internal combustion engine 3.

In the rotating electric machine 4, the actual number of turns is made variable for each phase by providing

intermediate joints

8U, 8V, 8W in the

windings

7U, 7V, 7W.

Here, the actual number of turns refers to the number of turns of a portion of each of the

windings

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

In the windings 7U to 7W of the rotating electrical machine 4, the resistance value of a portion energized by the power supplied from the battery 2 during the operation as a motor or a portion supplying the induced voltage to the battery 2 during the operation as a generator is variable for each phase, and the current value is variable.

Specifically, the two windings 7U1 and 7U2 are connected in series in the winding 7U, and an intermediate connector 8U is provided at a connection portion between the winding 7U1 and the winding 7U 2. Similarly, in the winding 7V, two windings 7V1 and 7V2 are connected in series, and an intermediate tab 8V is provided at a connection portion between the winding 7V1 and the winding 7V 2. In the winding 7W, two windings 7W1 and 7W2 are connected in series, and an intermediate connector 8W is provided at a connection portion between the winding 7W1 and the winding 7W 2. Thus, in the rotating electrical machine 4, the actual number of turns is variable for each phase, and the actual number of turns for all phases can be changed by the drive circuit 5 as described later.

In each of the windings 7U2, 7V2, and 7W2, one terminal not forming the

intermediate joints

8U, 8V, and 8W is connected as a neutral point and star-connected.

In the following description, the terminal on which the

intermediate tabs

8U, 8V, and 8W are not formed among the windings 7U1, 7V1, and 7W1 is referred to as a U terminal 9U, V terminal 9V, W terminal 9W. For the sake of simplicity of explanation, the windings 7U1, 7U2, 7V1, 7V2, 7W1, and 7W2 are all made to have the same integer n and the same resistance value.

The rotating electrical machine 4 is provided with a position sensor 4a for detecting the position of the magnet of the rotor. The position sensor 4a includes 3 hall sensors PU, PV, PW arranged at intervals between poles of the stator.

Next, the drive circuit 5 has two

inverter circuits

5a, 5 b.

Both of the

inverter circuits

5a and 5b are 3-phase bridge circuits (hereinafter, the semiconductor switches S are referred to as switches S) in which two semiconductor switches S are connected in series and 3 series connections of the two semiconductor switches S are connected in parallel.

In the inverter circuit 5a, one terminal of the series connection is connected to the positive electrode of the battery 2, and the other terminal is connected to the ground. The 3 middle points of the series connection are connected to the U terminal 9U, V terminal 9V, W terminal 9W, respectively. In the other inverter circuit 5b, one terminal of the series connection is connected to the positive electrode of the battery 2, and the other terminal is connected to the ground. The 3 midpoints connected in series are connected to

intermediate connectors

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

Further, a smoothing capacitor 10 is connected in parallel to the

inverter circuits

5a and 5 b. The switch S is, for example, an N-channel power MOSFET.

In the following description, of the two switches S included in the series connection in which the midpoint of the 3 series connections of the inverter circuit 5a is connected to the U terminal 9U, the switches S on the high potential side and the low potential side are sometimes referred to as switches Sup1 and Sun1, respectively. The two switches S included in the series connection having the midpoint connected to the V terminal 9V are sometimes referred to as switches Svp1 and Svn1, respectively, as the high-side and low-side switches S. The two switches S included in the series connection in which the midpoint is connected to the W terminal 9W are sometimes referred to as switches Swp1 and Swn1, respectively.

Similarly, of the 3 series connections of the inverter circuit 5b, the two switches S included in the series connection in which the midpoint is connected to the intermediate tab 8U may be referred to as a high-side switch S and a low-side switch S as switches Sup2 and Sun2, respectively. In addition, regarding the two switches S included in the series connection in which the midpoint is connected to the intermediate junction 8V, the switches S on the high potential side and the low potential side may be referred to as switches Svp2 and Svn2, respectively. The two switches S included in the series connection in which the midpoint is connected to the intermediate joint 8W are sometimes referred to as switches Swp2 and Swn2, respectively.

Next, the Control Unit 6 (Control Unit) is an Electronic Control Unit (ECU) that controls the operation of the rotating electric 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, various memories 6C that store and hold data and programs and the like necessary for the control Processing and arithmetic Processing, an output circuit 6D that outputs a necessary signal based on a Processing result of the CPU, and the like.

Further, the control portion 6 controls the operation of the rotating electrical machine 4 by performing the following inverter operation in accordance with the output of the position sensor 4 a. That is, the inverter operation is to sequentially determine the switch to be turned ON (ON) or OFF (OFF) from the 12 switches S included in the

inverter circuits

5a and 5b, and to sequentially drive the switch S to be turned ON or OFF.

Also, the control section 6 makes the number of turns per phase change more realistic by performing an inverter operation. More specifically, the control section 6 selects from 3 values of 2n, 3n, 4n with respect to the actual number of turns of the full phase in the inverter operation.

For example, when the power is supplied to the windings 7U and 7V during the operation as the motor, if the switches Sup1 and Svn1 are selected as the switches to be turned on, the windings 7U1, 7U2, 7V1, and 7V2 are supplied with power from the battery 2, and therefore the actual number of turns of the U-phase and the V-phase are 2n and 2n, respectively, and the actual number of turns of the entire phase is 4 n.

When the switches Sup2 and Svn2 are selected as switches to be turned on, the windings 7U2 and 7V2 are supplied with power from the battery 2, and therefore the actual number of turns of each of the U-phase and the V-phase is n, and the actual number of turns of the entire phase is 2 n.

When the switches Sup1 and Svn2 are selected as switches to be turned on, the windings 7U1, 7U2, and 7V2 are supplied with power from the battery 2, and therefore the actual number of turns of each of the U-phase and the V-phase is 2n and n, and the actual number of turns of the entire phase is 3 n.

When the switches Svn1 and Sup2 are selected as switches to be turned on, the windings 7U2, 7V1, and 7V2 are supplied with power from the battery 2, and therefore the actual number of turns of each of the U-phase and the V-phase is n and 2n, and the actual number of turns of the entire phase is 3 n.

Hereinafter, in the inverter operation, modes in which 4n, 2n, 3n are selected as the actual number of turns of all phases when a voltage is applied from the battery 2 to 2 phases among the windings 7U to 7W of the 3 phases or an induced voltage is supplied from the 2 phases to the battery 2 are referred to as a large mode, a small mode, and a medium mode, respectively.

Here, fig. 2A shows the transition of on and off of the switch S in the operation as the large mode of the electric motor with the rotation speed Ne of the internal combustion engine 3 on the horizontal axis, and fig. 2B shows an example of a combination of switches on and off of 12 switches S in each of the large, small, and medium modes.

That is, during the operation as a motor in the large mode and the small mode, the 1 st to 3 rd patterns and the 4 th to 6 th patterns are sequentially repeated based on the signal of the position sensor 4 a. In the middle mode, the 7 th to 9 th patterns or the 10 th to 12 th patterns are repeated in this order. In the middle mode, for example, the 7 th pattern → the 11 th pattern → the 9 th pattern → the 10 th pattern → the 7 th to 9 th pattern group and the 10 th to 12 th pattern group are alternately repeated, whereby heat generation of the windings 7U to 7W and the switch S can be dispersed and suppressed.

Fig. 3 shows, for example, the correlation between the rotational speed and the torque when the rotating electrical machine 4 is operated as a motor and the correlation between the rotational speed and the generated current when the rotating electrical machine 4 is operated as a generator in each of large, medium, and small modes.

According to fig. 3, the large mode is suitable for assisting when the internal combustion engine 3 is started and when the rotation speed of the internal combustion engine 3 is in a low rotation range (for example, to around 2500 rpm) in the operation as the motor. The middle mode is suitable for assisting when the rotation speed of the internal combustion engine 3 is in a middle rotation range (for example, from 2000rpm to approximately 3500 rpm). The small mode is suitable for assisting when the rotation speed of the internal combustion engine 3 is in a high rotation range (for example, from 3000rpm to around 5500 rpm). The induced voltage in the winding of the windings 7U to 7W, which is not supplied with power from the battery 2 during the operation as a motor in the medium mode or the small mode, may be used for charging the battery 2 or short-circuiting the battery as described later.

In addition, according to fig. 3, in the operation as the generator, the battery 2 can be charged in the large mode from a rotation speed range (for example, around 800 rpm) in which the rotation speed of the internal combustion engine 3 is low. In the middle mode, the generated current is reduced due to the reduction of the actual number of turns, and therefore, the middle mode is suitable for charging the battery 2 from the middle rotation range (for example, around 3000 rpm). In addition, the small mode is suitable for charging the battery 2 from a high rotation range (for example, around 5000 rpm) because the actual number of turns is further reduced and the generated current is further reduced.

The system 1 includes a rotation speed detector 12 (functioning as a rotation speed detection means) and a voltage detector 13 (functioning as a voltage detection means) as described below (see fig. 1).

First, the rotation speed detector 12 is for detecting the rotation speed of the internal combustion engine 3, and is, for example, a crank angle sensor of a well-known structure that detects the crank angle of the internal combustion engine 3. That is, the rotation speed detector 12 is used for detecting a crank angle by 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 is provided for detecting the voltage of the battery 2, for example, as an a/D conversion circuit of a well-known configuration.

The control unit 6 selects one of the large, small, and medium modes based on the detection values of the rotation speed detector 12 and the voltage detector 13 to perform an inverter operation, and operates the rotating electrical machine 4 as a motor or a generator.

First, the control unit 6 determines whether or not to operate the rotating electrical machine 4 as a motor, based on the charge balance of the battery 2 predicted using the temporal change in the detection value of the voltage detector 13 or the state of charge of the battery 2 determined based on the detection value of the voltage detector 13 at the time of starting the internal combustion engine 3 (see fig. 7 and block S1). Fig. 7 is a diagram for explaining a part of the functions executed by the control section 6, and is functionally realized by the CPU 6B reading out and executing the control program provided in the first embodiment from the memory 6C.

Specifically, when the predicted charge balance of the battery 2 is negative or when the detected value of the voltage of the battery 2 at the time of starting the internal combustion engine 3 is lower than the reference value, the control unit 6 regards that the necessity of charging the battery 2 is high, controls the rotating electrical machine 4 to operate as a generator for a predetermined period, and does not operate the rotating electrical machine 4 as a motor. That is, control unit 6 determines the actual number of turns so that the voltage induced in windings 7U to 7W becomes higher than the voltage of battery 2.

Next, the control unit 6 has two thresholds (a first threshold C1 and a second threshold C2) set in advance for the rotation speed of the internal combustion engine 3. Note that, as shown in fig. 3 (a), when the rotating electrical machine 4 is operated as a motor, the first threshold value C1 is set to a rotation speed at which the torque of the torque curve in the large mode is 0, for example. The first threshold value C1 may be equal to or less than a rotation speed at which the torque becomes 0. Similarly, the second threshold value C2 is set to a rotation speed at which the torque of the torque curve of the middle pattern is equal to 0, for example. The second threshold value C2 may be equal to or less than a rotation speed at which the torque becomes 0. In addition, the rotation speed at which the torque represented in the small mode becomes 0 is a limit rotation speed at which the rotation can be driven.

Therefore, the CPU 6B as the control unit 6 executes the control program read out from the memory 6C to perform the mode control B1 for driving the inverters 5a and 5B, thereby functioning to determine the actual number of turns per phase. Therefore, when the rotating electrical machine 4 is operated as a motor, the control unit 6 performs a comparison determination between the detection value of the rotation speed detector 12 and the first and second threshold values C1 and C2 (see fig. 7 and threshold value comparison determination B11), and determines the actual number of turns for each phase based on the result of the determination (see fig. 7 and mode selection command B12).

Specifically, the controller 6 has first and second threshold values C1 and C2(C1< C2) for the rotation speed of the internal combustion engine 3. When the detection value of the rotation speed detector 12 is smaller than the first threshold value C1, the control unit 6 selects one of the large mode, the medium mode, and the small mode to operate the rotating electrical machine 4 as a motor, and assists the output of the internal combustion engine 3 with the output of low-speed high torque.

When the detection value of the rotation speed detector 12 is equal to or greater than the first threshold value C1 and less than the second threshold value C2, the control unit 6 selects the medium mode or the small mode to operate the rotating electric machine 4 as a motor, and assists the output of the internal combustion engine 3 with the output of medium-speed and medium-speed torque.

When the detection value of the rotation speed detector 12 is equal to or greater than the threshold value C2 and equal to or less than the limit frequency, the control unit 6 operates the rotating electrical machine 4 as a motor in the small mode. Thereby, the internal combustion engine 3 is assisted by the output of high speed and low torque.

Further, the control section 6 controls the charging of the battery 2 by the parasitic diode attached to the switch S that is not selected as the switch to be turned on in the inverter operation other than the large mode (refer to fig. 7, charging control B2). For example, when the 4 th pattern is selected, the switches S selected as the switches 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, by turning on and off the switch Sun1 by the voltage induced in the winding 7U1, the battery 2 can be charged by the parasitic diode attached to the switch Sup1 while controlling the voltage of the battery 2 (for example, see a portion surrounded by a circle in fig. 2A).

Here, an example of the operation characteristics of the system 1 will be described with reference to fig. 4.

Fig. 4 illustrates the operation characteristics in the case where the rotation speed of the internal combustion engine 3 changes between N1(> first threshold C1) and N2(> second threshold C2). In fig. 4, the horizontal axis represents the rotation speed Ne of the internal combustion engine 3, the vertical axis represents the current I flowing between the battery 2 and the drive circuit 5, and the direction of the current flowing when operating as a generator is positive. The currents flowing through the generator and the motor are referred to as a generated current and a motor current, respectively, and are indicated by solid lines. The current flowing through the other electrical load is referred to as an electrical load current and is indicated by a dotted line.

According to fig. 4, in the operation as a generator, the large mode is selected so that the generated current is larger than the electrical load current. In the operation as the motor, for example, the middle mode is selected in a range where the rotation speed of the internal combustion engine 3 is lower than the second threshold value C2, and the small mode is selected in a range where the rotation speed is higher than the second threshold value C2.

When the observation operation is performed over time, rotation speed Ne and current I reciprocate 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 rotary electric machine 4 has the actual number of turns variable per phase by providing the intermediate joints 8U to 8W in each of the windings 7U to 7W.

The control unit 6 controls the operation of the rotating electric machine 4 by sequentially selecting on and off switches from the switches S included in the

inverter circuits

5a and 5b and by sequentially changing the inverter operation of the switch S to be selected. Further, the control section 6 performs an inverter operation to make the number of turns more realistic per phase change.

This makes it possible to increase or decrease the actual number of turns at a high speed for each phase, and therefore, it is possible to change the output of the motor or the generator at a high speed, or to switch the operation of the rotating electrical machine 4 between the motor and the generator at a high speed. Therefore, in the system 1, the fuel consumption rate reducing effect can be improved. For example, by reducing the amount of charge to the battery 2 by the amount conventionally released to the ground by a short circuit in the induced voltage generated at the time of high rotation, the fuel consumption rate reducing effect can be improved.

The system 1 further includes a rotation speed detector 12 for detecting the rotation speed of the internal combustion engine 3, and the control unit 6 has thresholds C1 and C2(C1< C2) for the rotation speed of the internal combustion engine 3, and further changes the actual number of turns per phase based on the result of comparison between the detection value of the rotation speed detector 12 and the thresholds C1 and C2.

This enables the output of the rotating electrical machine 4 to be changed at high speed in response to load fluctuations of the internal combustion engine 3 and the like.

The system 1 further includes a voltage detector 13 for detecting the voltage of the battery 2. The control unit 6 determines whether or not to operate the rotating electrical machine 4 as a motor based on the charge balance of the battery 2 predicted using the temporal change in the detection value of the voltage detector 13 or the detection value of the voltage detector 13 at the time of starting the internal combustion engine 3.

This can reduce the influence of voltage fluctuations of the battery 2 on other electrical loads, which is caused by operating the rotating electrical machine 4 as a motor.

The control unit 6 controls charging of the battery 2 by a parasitic diode attached to the switch S that is not selected as the switch to be turned on during the inverter operation. This can improve the charging efficiency.

[ second embodiment ]

A system 1 of a second embodiment is explained. In the second embodiment, a description will be given mainly of a configuration different from that of the system 1 of the first embodiment, and the same reference numerals are given to the same configurations as those described in the first embodiment, and the description thereof will be omitted or simplified.

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

The control unit 6 determines whether or not to operate the rotating electrical machine 4 as a motor based on the position of the stroke, based on the result of the determination by the stroke determination unit 15 (see fig. 8 and block B21). The stroke determination unit 15 determines the stroke of the internal combustion engine 3 based on, for example, a signal (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 the compression stroke or the explosion stroke, the control unit 6 operates the rotating electrical machine 4 as a motor. For example, as shown in fig. 6, the rotary electric machine 4 is operated as a motor in the latter half of the compression stroke, the entire explosion stroke, and the former half of the exhaust stroke, in which assistance of the output of the internal combustion engine 3 is considered to be particularly effective, so that the traveling feeling of the vehicle is optimized.

Further, the control unit 6 operates the rotating electrical machine 4 as a generator at a time other than the time period during which the rotating electrical machine 4 is operated as a motor (see fig. 8 and block B22). The control unit 6 extends or shortens the period of time during which the battery 2 operates as a motor according to the charge balance (see fig. 8 and block S23). That is, when the amount of charge of the battery 2 is expected to be too low when the battery is operated as a motor, the control unit 6 shortens the period of operation as a motor and expands the period of operation as a generator.

According to the above, according to the system 1 of the second embodiment, the operation of the rotating electrical machine 4 is switched between the motor and the generator more specifically in accordance with the stroke of the internal combustion engine 3, whereby the fuel consumption rate reducing effect can be further improved and the running feeling of the vehicle can be improved.

[ modified example ]

The invention of the present application is not limited to the embodiments, and various modifications can be considered.

For example, according to the system 1 of the embodiment, the

intermediate terminals

8U, 8V, and 8W are provided 1 for each phase, but for example, the intermediate terminals 8U to 8W may be provided 2 or more, and the inverter circuit may be increased in accordance with an increase in the number of the intermediate terminals 8U to 8W.

In the windings 7U to 7W according to 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 set to the same n. For example, the winding 7U1 may be provided by connecting two windings of the actual number n in parallel.

The number of poles of the rotor and the number of poles of the stator of the rotating electrical machine 4 are not limited to the 12 poles and 18 poles which are common in 3-phase motor generators, and a delta connection may be used as a connection method of the windings.

The timing for switching the operation of the rotating electrical machine 4 between the motor and the generator is not limited to the embodiment, and may be changed as appropriate according to the traveling feeling of the vehicle or the like.

In addition, the control unit 6 may be configured to execute the following short-circuit mode in order to increase the engine brake during deceleration or the like. 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 the inverter operation, and is different from a control mode in which the rotating electrical machine 4 is operated as a 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, or the switches Sun2, Svn2, and Swn2 may be turned on in addition to the switches Sun1, Svn1, and Swn 1.

At this time, for example, when the generated currents generated in the windings 7U1, 7U2, 7V1, and 7V2 are short-circuited, the switches Sun1 and Svn1 are turned on to make short-circuiting possible, and the switches Sun2 and Svn2 are turned on in addition to the switches Sun1 and Svn1 to disperse heat generation at the time of short-circuiting and improve the degree of short-circuiting of the windings to provide braking capability.

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

The present disclosure has been described in terms of embodiments, but it should be understood that the present disclosure is not limited to the embodiments, constructions. The present disclosure also includes various modifications and modifications within an equivalent range. In addition, various combinations and modes and other combinations and modes in which only one element is included, or more than one element or less than one element are included in the scope and the spirit of the present disclosure.

Claims

1. A motor/generator device (1) for a vehicle, which assists an output of an internal combustion engine (3) by generating an output by a power supply from a battery (2) or charges the battery (2) with a voltage induced by the output of the internal combustion engine (3), the motor/generator device (1) comprising:

a rotating electrical machine (4) that operates as a motor that assists the output of the internal combustion engine (3) or as a generator that charges the battery (2), and that has intermediate joints (8U-8W) provided in windings (7U-7W) of the respective phases, so that the number of turns of a portion that is energized by power supplied from the battery (2) or the number of turns of a portion that supplies an induced voltage to the battery (2), i.e., the actual number of turns, can be increased for each phase change;

a drive circuit (5) having a plurality of inverter circuits connected to the windings (7U to 7W) of the respective phases, wherein the inverter circuits include inverter circuits connected to the intermediate terminals (8U to 8W); and

a control means (6) for controlling the operation of the rotating electrical machine (4) as a motor or a generator by executing an inverter operation in which a switch to be turned on or off is sequentially selected from the semiconductor switches (S) included in the plurality of inverter circuits and the semiconductor switch (S) to be selected is sequentially changed,

said rotary electric machine (4) having a rotor directly coupled to the crankshaft of said internal combustion engine (3),

the control unit (6) updates the actual number of turns per phase change by performing the inverter operation according to an operating state of a vehicle.

2. The motor-generator device (1) according to claim 1,

a rotation speed detection means (12) for detecting the rotation speed of the internal combustion engine (3) by the rotation speed detection means (12),

the control unit (6) has threshold values (C1, C2) for the rotation speed of the internal combustion engine (3), and the actual number of turns per phase change is changed according to the result of comparison between the detection value of the rotation speed detection unit (12) and the threshold values (C1, C2).

3. The motor-generator device (1) according to claim 2,

the threshold value has a first threshold value (C1) and a second threshold value (C2) that is greater than the first threshold value (C1), and the control means (6) operates the rotating electrical machine (4) as a motor to assist the output of the internal combustion engine (3) with the output of low-speed high torque when the detection value of the rotation speed detection means (12) is less than the first threshold value (C1), assists the output of the internal combustion engine (3) with the output of medium-speed medium torque when the detection value is greater than the first threshold value (C1) and less than the second threshold value (C2), or assists the internal combustion engine (3) with the output of high-speed low torque when the detection value is greater than the second threshold value (C2).

4. The motor-generator device (1) according to any one of claims 1 to 3,

a stroke determination means (15) for determining the stroke of the internal combustion engine (3) is provided,

the control unit (6) determines whether or not to operate the rotating electrical machine (4) as the motor, based on the result of the determination by the stroke determination unit (15).

5. The motor-generator device (1) according to claim 4,

the period in which the rotating electrical machine (4) is operated as the motor includes a period in which the stroke determination means (15) determines that the compression stroke is set.

6. The motor-generator device (1) according to any one of claims 1 to 3,

the control unit (6) selects the actual number of turns for a full phase from 3 or more values 2n, 3n, 4n by changing the actual number of turns per phase.

7. The motor-generator device (1) according to any one of claims 1 to 3,

a voltage detection means (13) for detecting the voltage of the battery (2) by the voltage detection means (13),

the control means (6) determines whether or not to operate the rotating electrical machine (4) as the electric motor, based on the charge balance of the battery (2) predicted using the temporal change in the detection value of the voltage detection means (13), or the detection value of the voltage detection means (13) at the time of starting the internal combustion engine (3).

8. The motor-generator device (1) according to any one of claims 1 to 3,

the control unit (6) controls charging of the battery (2) by a parasitic diode accompanying in the semiconductor switch (S) that is not selected as a switch that should be turned on in the inverter operation.

9. The motor-generator device (1) according to any one of claims 1 to 3,

the control unit (6) has a short-circuit mode in which the voltages induced in the windings (7U-7W) of the respective phases are short-circuited by the inverter operation.