JP2016201861A5 - - Google Patents

Description

Further, the electric motor device includes a rotation speed detection means for detecting the rotation speed of the internal combustion engine, and the control means has the following two-phase mode and three-phase mode.
That is, in the three-phase mode, the first combination (W, U) and the second combination (the combination of the windings that become the high potential side when the battery voltage is applied to the three-phase windings (U to W) ( U, V) and the third combination (V, W) are sequentially repeated. The two-phase mode is a mode in which at least one combination is not executed among the first combination (W, U), the second combination (U, V), and the third combination (V, W). Furthermore, the control means has a first threshold for the rotational speed of the internal combustion engine, and uses the two-phase mode when the value detected by the rotational speed detection means is larger than the first threshold.
Furthermore, the electric motor device includes a stroke determination unit that determines a stroke of the internal combustion engine. And a control means determines whether a rotary electric machine is operated as an electric motor according to the result of the determination by a stroke determination means.

Thus, by using the two-phase mode, it is possible to reduce the power consumption necessary for operating the rotating electrical machine as an electric motor, and to suppress heat generation by distributing the energization to the switches and windings. . Further, even if the rotational driving force of the rotating electrical machine decreases due to the use of the two-phase mode, the reverse rotation and the stop can be prevented by using the rotation of the rotating electrical machine by the internal combustion engine. For this reason, cost reduction and size reduction can be promoted in the electric motor apparatus for vehicles.
Further, the fuel consumption reduction effect can be further enhanced by switching the operation of the rotating electrical machine between the electric motor and the generator more finely according to the stroke of the internal combustion engine.

It is a whole block diagram of an electric motor apparatus ( reference example 1 ). It is a transition diagram which shows transition of the on / off of the switch in operation | movement of a large mode ( reference example 1 ). It is a table | surface which shows an example of the combination of what turns on / off among the switches in operation with respect to an inverter ( reference example 1 ). This is the correlation between the rotational speed and torque when the rotating electrical machine is operated as an electric motor ( Reference Example 1 ). It is a characteristic view which shows the operation example of an electric motor apparatus ( reference example 1 ). It is a whole block diagram of an electric motor apparatus ( reference example 2 ). It is a table | surface which shows the combination of what turns on / off among the switches in operation with respect to an inverter ( reference example 2 ). (A) is the correlation between the rotational speed and the torque when the rotating electrical machine is operated as an electric motor, and (b) is the correlation between the rotational speed and the generated current when the rotating electrical machine is operated as a generator ( Reference Example 2 ). 1 is an overall configuration diagram of an electric motor device ( Example 1 ). FIG. FIG. 3 is a time chart showing the transition of switching between an electric motor and a generator for each stroke of the internal combustion engine ( Example 1 ). FIG .

[Configuration of Reference Example 1 ]
The structure of the electric motor apparatus 1 of the reference example 1 is demonstrated using FIG.
The electric motor device 1 is provided in a vehicle and generates an output by feeding power from an on-vehicle battery (hereinafter simply referred to as a battery 2) to start the internal combustion engine 3 or assist the output of the internal combustion engine 3. Or the battery 2 is charged by a voltage induced by the driving force of the internal combustion engine 3 and has both functions of an electric motor and a generator (hereinafter, the electric motor device 1 is referred to as a system 1).
The system 1 includes the following rotating electrical machine 4, inverter circuit 5, and control means 6.

[Effect of Reference Example 1 ]
According to the system 1 of the reference example 1 , the control means 6 has a three-phase mode and a two-phase mode, and the two-phase mode is set when the detection value by the rotation speed detection means 12 is larger than the first threshold value C0. use.
Thus, by using the two-phase mode, it is possible to reduce the power consumption necessary for operating the rotating electrical machine 4 as an electric motor, and partially omit energization to the switch S and the windings 7U to 7W. By doing so, heat generation can be suppressed. Further, even if the rotational driving force of the rotating electrical machine 4 decreases due to the use of the two-phase mode, the reverse rotation and the stop can be prevented by using the rotation of the rotating electrical machine 4 by the internal combustion engine 3. For this reason, in the system 1, cost reduction and size reduction can be promoted.

[Configuration of Reference Example 2 ]
The system 1 of the reference example 2 will be described focusing on differences from the system 1 of the reference example 1.
According to the system 1 of Reference Example 2, as shown in FIG. 5, by the winding 7U~7W providing an intermediate tap 8 U, 8 V, 8 W , has a variable number of actual turns in each phase.
Note that the actual number of turns means the number of turns in each of the windings 7U to 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. This is the number of turns of the part to be supplied.
For this reason, in the windings 7U to 7W of the rotating electrical machine 4, the resistance value of the portion that is energized by the power supply from the battery 2 in the operation as the electric motor or the portion that supplies the induced voltage to the battery 2 in the operation as the generator. Is variable.

Specifically, the winding 7U, 2 one winding 7U1,7U2 are connected in series, the intermediate tap 8 U is provided in the connection portion of the winding 7U1,7U2. Similarly, the winding 7V, 2 one winding 7V1,7V2 are connected in series, and the center tap 8 V is provided to the connection portion of the winding 7V1,7V2, the winding 7W, 2 one winding 7W1,7W2 are connected in series, the intermediate tap 8 W is provided in the connection portion of the winding 7W1,7W2. Thereby, in the rotary electric machine 4, the actual number of turns is variable for each phase.

Moreover, all the windings 7U1,7U2,7V1,7V2,7W1,7W2 are mutually the same number of turn, in each of the windings 7U2,7V2,7W2 those who do not form an intermediate tap 8 U, 8 V, 8 W Terminal is star-connected.
In the following description, the terminal of the person who in each of the windings 7U1,7V1,7W1 does not form an intermediate tap 8 U, 8 V, 8 W , U terminal 9U, V terminal 9V, and W terminals 9W. Further, the number of turns of the windings 7U1, 7U2, 7V1, 7V2, 7W1, and 7W2 are all set to the same integer n for the sake of simplicity.

Next, the system 1 of Reference Example 2 includes two inverter circuits 5.
The inverter circuits 5 are both three-phase bridge circuits in which two switches S are connected in series, and three series connections of two semiconductor switches S are connected in parallel.

In one inverter circuit 5, one terminal connected in series is connected to the positive electrode of the battery 2, the other terminal is connected to the ground, and three middle points connected in series are the U terminal 9U, It is connected to V terminal 9V and W terminal 9W. In the other inverter circuit 5, one terminal connected in series is connected to the positive electrode of the battery 2, the other terminal is connected to the ground, and the three middle points connected in series are the intermediate taps 8 U, respectively. connection are connected to the 8 V, 8 W (hereinafter, U terminal 9U, V terminal 9V, the inverter circuit 5 connected to the W-terminal 9W called the inverter circuit 5a, the intermediate tap 8 U, 8 V, 8 W The inverter circuit 5 that performs this operation may be referred to as an inverter circuit 5b.)

Similarly, the three series-connected inverter circuit 5b, relates the two switches S, the high potential side, of the low-side switch S each switch included in what midpoint is connected to the intermediate tap 8 U Sup2, Sun2 Sometimes called. Moreover, midpoint relates two switches S contained in those connected to the intermediate tap 8 V, a high potential side, it may switch S on the low potential side is referred to as a switch Svp2, Svn2 respectively. Furthermore, the midpoint is relates two switches S contained in those connected to the intermediate tap 8 W, the high-potential side, it may switch S on the low potential side is referred to as a switch Swp2, Swn2 respectively.

And according to the system 1 of the reference example 2 , the control means 6 selects the switch S that is sequentially turned on and off from the 12 switches S that the inverter circuits 5a and 5b have, and the switch S that should be selected sequentially. (Hereinafter, among the 12 switches S, one that is sequentially turned on and off is selected, and the operation that sequentially changes the switch S to be selected may be referred to as an inverter operation).

Here, FIG. 6 shows combinations of the 12 switches S that are turned on and off in each of the three-phase mode and large mode, the three-phase mode and small mode, the three-phase mode and medium mode.
That is, in the three-phase mode and large mode, and in the three-phase mode and small mode, the seventh to ninth patterns and the tenth to twelfth patterns are sequentially repeated, respectively. In the three-phase mode and the middle mode, the thirteenth to fifteenth patterns or the sixteenth to eighteenth patterns are sequentially repeated. In the three-phase mode and the medium mode, for example, a group of 13th to 15th patterns and a group of 16th to 18th patterns such as 13th pattern → 17th pattern → 15th pattern → 18th pattern → By alternately repeating the above, heat generated by the drive currents of the windings 7U to 7W and the switch S can be dispersed and suppressed.
The two-phase mode and the large mode, the two-phase mode and the small mode, and the two-phase mode and the medium mode are the same as the two-phase modes 1 to 4 of the reference example 1 and will not be described.

Furthermore, the system 1 of Reference Example 2 includes voltage detection means 15 that detects the voltage of the battery 2 (note that the voltage detection means 15 is provided as an A / D conversion circuit having a known structure, for example).
Then, the control means 6 selects one of the large, small, and medium modes according to the detection values of the rotation speed detection means 12 and the voltage detection means 15 and executes the inverter operation to Or operate as a generator.
First, the control means 6 rotates based on the charge balance of the battery 2 predicted using the change over time of the detection value by the voltage detection means 15 or the detection value by the voltage detection means 15 when the internal combustion engine 3 is started. It is determined whether or not the electric machine 4 is operated as an electric motor.

[Effect of Reference Example 2 ]
According to the system 1 of the reference example 2 , the rotating electrical machine 4 makes the actual number of turns variable for each phase by providing the intermediate tap 8 in the windings 7U to 7W of each phase.
Further, the control means 6 selects one that is sequentially turned on / off from among the switches S that the two 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. Further, the control means 6 changes the actual number of turns for each phase by executing an inverter operation.

[Configuration of Example 1 ]
Describes systems 1 of the first embodiment mainly in the system 1 differs from Example 2.
The system 1 according to the first embodiment includes a stroke determination unit 17 that determines the stroke of the internal combustion engine 3. Then, the control unit 6 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 17.
Here, the function of the stroke determination means 17 is realized by an ECU functioning as the control means 6. Further, the stroke determination unit 17 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 detection unit 12 and a signal indicating the intake pressure of the internal combustion engine 3. .

Note that the control means 6 operates the rotating electrical machine 4 as a generator at a time other than the period during which the rotating electrical machine 4 operates as an electric motor. Further, the control means 6 extends or shortens the period for operating as an electric motor according to the charge balance of the battery 2. That is, when it is anticipated that the charge amount of the battery 2 will fall, the control means 6 shortens the period operated as an electric motor.
As described above, according to the system 1 of the first embodiment , the fuel consumption reduction effect is further enhanced by switching the operation of the rotating electrical machine 4 between the electric motor and the generator more finely according to the stroke of the internal combustion engine 3. be able to.

Further, according to the system 1 of the first embodiment , the two-phase mode is implemented in the explosion stroke and the exhaust stroke that can be expected to be driven by the internal combustion engine 3 during the period of operation as the electric motor, and the three-phase mode is performed at other times. Implement the mode.
Thereby, the cost reduction and size reduction of the system 1 by use of 2 phase mode can be promoted.

[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 8 U, 8 V, 8 W is provided for each phase. For example, two or more intermediate taps 8 U to 8 W are provided. , may be increased inverter circuit 5 in accordance with the number increasing intermediate tap 8 U~ 8 W.

Further, according to the system 1 of Example 1, the winding 7U～7W provided with an intermediate tap 8 U~ 8 W of the rotating electric machine 4, by connecting a plurality of inverter circuits 5 to the winding 7U～7W, Although the actual number of turns can be changed by the control means 6, for example, in order to make the actual number of turns for each phase variable, the actual number of turns for each phase by turning on and off the relay switch in the windings 7U to 7W of each phase. You may make it increase / decrease.

Here, according to the system 1 of the first embodiment , for example, in the short circuit mode, the switches Sun1, Svn1, and Swn1 may be turned on to short-circuit the generated current. In addition to the switches Sun1, Svn1, and Swn1, the switch Sun2, Svn2 and Swn2 may be turned on.

  Furthermore, according to the system 1 of the embodiment, the mode in which none of the first to third patterns is executed is illustrated as the two-phase mode. For example, at least one of the first to third patterns of the three-phase mode is illustrated. It may not be executed. For example, in the system 1 of Reference Example 1, when the second and third patterns are executed without executing the first pattern (the combination in which the windings 7W and 7U are on the high potential side), the first pattern is replaced with the first pattern. The two-phase mode may be partially realized by adopting four patterns and repeating three patterns of the fourth, second, and third patterns.

DESCRIPTION OF SYMBOLS 1 System (electric motor apparatus) 2 Battery 3 Internal combustion engine 4 Electric rotating machine 6 Control means 7U-7W Three-phase winding 12 Rotation speed detection means C0 1st threshold value S Switch 17 process determination means

Claims (8)

A rotating electrical machine (4) having three-phase windings (7U to 7W), a switch (S) for turning on / off voltage application to the windings (7U to 7W), and giving a command to the switch (S) Control means (6) for controlling the operation of the rotating electrical machine (4),
Based on the control by the control means (6), power is supplied from the battery (2) to operate the rotating electrical machine (4) as an electric motor, and the output of the internal combustion engine (3) is generated by the output generated by the operation as the electric motor. In the electric motor device (1) for the vehicle to assist,
A rotational speed detecting means (12) for detecting the rotational speed of the internal combustion engine (3);
The control means (6)
As a combination of the windings (7U to 7W) that become a high potential side when the voltage of the battery (2) is applied to the three-phase windings (7U to 7W), a first combination (7W, 7U), A three-phase mode that sequentially repeats the second combination (7U, 7V) and the third combination (7V, 7W);
A two-phase mode that does not execute at least one of the first combination (7W, 7U), the second combination (7U, 7V), and the third combination (7V, 7W);
Further, the control means (6) has a first threshold value (C0) with respect to the rotational speed of the internal combustion engine (3), and the detected value by the rotational speed detection means (12) is the first threshold value (C0). Is greater than), use the two-phase mode ,
The electric motor device (1) further includes stroke determination means (17) for determining a stroke of the internal combustion engine (3).
The control means (6) determines whether or not to operate the rotating electrical machine (4) as the electric motor according to the result of the determination by the stroke determination means (17 ). . In the electric motor device (1) according to claim 1,
The control means (6) has three or more options as the two-phase mode, and sequentially switches at least two of the three or more options when using the two-phase mode. An electric motor device (1). In the electric motor device (1) according to claim 1 or 2,
In the rotating electrical machine (4), the actual number of turns, which is the number of turns of the portion energized by the power supply from the battery (2) in the windings (7U to 7W), is variable for each phase. ,
The electric motor device (1), wherein the control means (6) changes the actual turn number for each phase. In the electric motor device (1) according to claim 3,
The control means (6) has a second threshold value for the rotational speed of the internal combustion engine (3), and depends on the result of comparison between the detected value by the rotational speed detection means (12) and the second threshold value. Then, the electric motor device (1), wherein the actual number of turns is changed for each phase. In the electric motor device (1) according to any one of claims 1 to 4,
The period for which the rotating electrical machine (4) is operated as the electric motor includes a time determined by the stroke determining means (17) as a compression stroke . In the electric motor device (1) according to any one of claims 1 to 5 ,
Voltage detection means (15) 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 (15), or when the internal combustion engine (3) is started. An electric motor apparatus (1) characterized by deciding whether or not to operate the rotating electric machine (4) as the electric motor based on a value detected by the voltage detecting means (15 ). In the electric motor device (1) according to any one of claims 1 to 6,
The electric motor device (1) , wherein a rotor of the rotating electrical machine (4) is directly connected to a crankshaft of the internal combustion engine (3 ). In the electric motor device (1) according to any one of claims 1 to 7,
An inverter circuit (5) connected to the three-phase windings (7U to 7W);
The rotating electrical machine (4) controls the operation of the rotating electrical machine (4) by operating on / off of the semiconductor switch (S) included in the inverter circuit (5),
The control means (6) controls charging of the battery (2) by a parasitic diode associated with the semiconductor switch (S) that is not turned on by the operation of the inverter circuit (5). (1).