JP2021127689A - Engine device - Google Patents

Abstract

To provide an engine device which enables reduction of loss during operation.SOLUTION: In an engine device, a housing 4 and a first piston member 24 and a second piston member 28, which are supported within the housing 4 in a manner that the piston members may rotate around a rotation axis AX in one direction, form combustion chambers C1 to C4 for combusting a fuel. A first rotary electric machine is connected to the first piston member 24 and rotationally drives the first piston member 24. A second rotary electric machine is connected to the second piston member 28 and rotationally drives the second piston member 28. In a case that pressure rise in the combustion chamber C1, caused by combustion of the fuel in the combustion chamber C1, rotationally drives the second piston member 28, the engine device causes the first rotary electric machine connected to the first piston member 24 to generate driving torque to rotationally drive the first piston member 24 during rotation of the second piston member 28.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to an engine device.

Japanese Patent Application Laid-Open No. 6-2559 (Patent Document 1) describes a rotating shaft, a first rotor and a second rotor rotating on the rotating shaft, and a power for transmitting the power of the first rotor and the second rotor to the rotating shaft. A rotary engine with a transmission means is described.

Japanese Unexamined Patent Publication No. 6-2559

In a rotary piston type engine in which a plurality of piston members can rotate independently, it is desired to reduce the loss during operation of the engine and improve fuel efficiency. The above document describes that the rotational power generated by the perfect circular rotational motion of a pair of rotors is output as it is to the rotating shaft to eliminate the rotational loss, but there is still room for improvement.

The present disclosure proposes an engine device capable of reducing loss during operation.

According to the present disclosure, an engine device including a rotating piston type engine is proposed. The engine includes a housing, a first piston member rotatably supported in the housing in one direction around the center of rotation, and a second piston member rotatably supported in the housing about the center of rotation in one direction. And, including. The housing, the first piston member and the second piston member form a combustion chamber for burning fuel. The engine device further includes a rotary electric device and a control device. The rotary electric machine rotationally drives the first piston member and the second piston member. In the control device, when the pressure rise in the combustion chamber due to the combustion of fuel in the combustion chamber rotationally drives one of the first piston member and the second piston member, the rotation of the one piston member is performed. A drive torque is generated in the rotary electric machine to control the piston member of either the first piston member or the second piston member to be rotationally driven.

Instead of rotating the piston member that is rotationally driven by the pressure rise in the combustion chamber with the drive torque of the rotary electric appliance, the piston member that is not rotationally driven by the pressure rise in the combustion chamber is rotated by the drive torque of the rotary electric appliance. As a result, the driving work generated by the rotary electric device for rotating the piston member becomes relatively small. Generating drive work in the rotary electric machine causes energy loss, but by controlling the drive work of the rotary electric machine to be small, the loss during operation of the engine can be reduced.

In the above engine device, the rotary electric machine is connected to the first piston member and rotationally drives the first piston member, and is connected to the second piston member and rotationally drives the second piston member. It may have a two-turn electric machine.

In the above engine device, the control device may control the rotary electric device to regenerative power generation by utilizing the rotation of the first piston member and the second piston member due to the increase in pressure in the combustion chamber.

According to the engine device according to the present disclosure, the loss during operation can be reduced.

It is a figure which shows an example of the schematic structure of the engine device in an embodiment. It is a perspective view which shows a part of the structure of an engine device. It is a figure which shows an example of the structure of the piston member provided in the engine. It is a schematic diagram for demonstrating the operation of a combustion chamber and an engine. It is a schematic diagram for demonstrating the operation of a combustion chamber and an engine. It is a schematic diagram for demonstrating the operation of a combustion chamber and an engine. It is a schematic diagram for demonstrating the operation of a combustion chamber and an engine. It is a graph which shows the phase change with time when driving a leading rotor. It is a graph which shows the change of the rotation speed with respect to time when driving a leading rotor. It is a graph which shows the change of the motor torque with time when the leading rotor is driven. It is a graph which shows the phase change with time when driving a follow-up rotor. It is a graph which shows the change of the rotation speed with time when driving a follow-up rotor. It is a graph which shows the change of the motor torque with time when driving a follow-up rotor.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are designated by the same reference numerals. Their names and functions are the same. Therefore, detailed explanations about them will not be repeated.

<Outline configuration of engine device 1>
FIG. 1 is a diagram showing an example of a schematic configuration of an engine device 1 according to an embodiment. FIG. 2 is a perspective view showing a part of the configuration of the engine device 1. As shown in FIGS. 1 and 2, the engine device 1 includes an engine 2, a rotary electric machine device 60, a first inverter 71, a second inverter 72, a battery 80, and a load 90. The engine device 1 also includes a first resolver 101, a second resolver 102, and a control device 200.

<Configuration of engine 2>
In the embodiment, the engine 2 is a rotating piston type internal combustion engine. As the fuel for the engine 2, for example, hydrogen, gasoline, gas (liquefied natural gas, liquefied petroleum gas, etc.) or light oil is used. The engine 2 includes a housing 4, an intake pipe 6, an exhaust pipe 8, a fuel supply device 10, a throttle valve 12, a throttle motor 14, a first output shaft 16, and a second output shaft 18.

One end of the intake pipe 6 is connected to an intake port (not shown) of the housing 4. An air cleaner (not shown) is connected to the other end of the intake pipe 6, for example. The air cleaner removes foreign matter from the air sucked from the outside of the engine 2. While the engine 2 is operating, the air sucked from the air cleaner flows through the intake pipe 6. The air flowing through the intake pipe 6 circulates in the intake port of the housing 4.

The throttle valve 12 is provided in the intake pipe 6 and limits the flow rate of air flowing through the intake pipe 6. The opening degree (throttle opening degree) of the throttle valve 12 is adjusted by the throttle motor 14 that operates in response to the control signal TH from the control device 200.

The fuel supply device 10 is provided on the upstream side of the throttle valve 12 of the intake pipe 6. The fuel supply device 10 supplies fuel into the intake pipe 6 in response to the control signal INJ from the control device 200. The fuel supplied into the intake pipe 6 is mixed with air in the intake pipe 6 and flows to the intake port of the housing 4.

The outer peripheral portion of the housing 4 is formed in a cylindrical shape, and the inner peripheral portion thereof is also formed in a cylindrical shape. The housing 4 houses a first piston member connected to the first output shaft 16 and a second piston member connected to the second output shaft 18 inside the housing 4.

One end of the exhaust pipe 8 is connected to an exhaust port (not shown) of the housing 4. For example, an exhaust treatment device (not shown) is connected to the other end of the exhaust pipe 8. During the operation of the engine 2, the exhaust generated by the combustion in the housing 4 flows from the exhaust port of the housing 4 to the exhaust pipe 8. The exhaust gas flowing through the exhaust pipe 8 is purified by the exhaust treatment device and discharged to the outside of the engine 2.

<Internal structure of engine 2>
Hereinafter, an example of the internal structure of the engine 2 will be described with reference to FIG. FIG. 3 is a diagram showing an example of the configuration of a piston member provided inside the engine.

As shown in FIG. 3, the first piston member 24 and the second piston member 28 are housed in the housing 4 in combination. The first piston member 24 includes a first rotating body 24a and a first wall surface member 24b. The second piston member 28 includes a second rotating body 28a and a second wall surface member 28b.

The first piston member 24 and the second piston member 28 are supported by the housing 4 and are rotatable in the housing 4. The first piston member 24 and the second piston member 28 have the same rotation center AX shown by the alternate long and short dash line in FIG. The first piston member 24 is rotatable about the rotation center AX. The second piston member 28 is rotatable about the rotation center AX.

The first rotating body 24a and the second rotating body 28a are provided so that one end surface of the first rotating body 24a and one end surface of the second rotating body 28a face each other in the axial direction. The first rotating body 24a and the second rotating body 28a are formed so as to have a slope portion in the cross section including the center of rotation thereof. As a result, in a state where the first rotating body 24a and the second rotating body 28a are combined, a recess having a V-shaped cross section is formed between the first rotating body 24a and the second rotating body 28a in the circumferential direction. Is formed in.

The first rotating body 24a is provided with a first wall surface member 24b that extends from the center of rotation AX toward the inner peripheral surface of the housing 4 and whose end abuts on the inner peripheral surface of the housing 4. The first wall surface member 24b is composed of two triangular plate-shaped members. The two triangular plate-shaped members of the first wall surface member 24b are provided on the first rotating body 24a so as to have a positional relationship symmetrical with respect to the rotation center AX.

The second rotating body 28a is provided with a second wall surface member 28b that extends from the center of rotation AX toward the inner peripheral surface of the housing 4 and whose end abuts on the inner peripheral surface of the housing 4. The second wall surface member 28b is composed of two triangular plate-shaped members having the same shape as the plate-shaped member constituting the first wall surface member 24b described above. The two triangular plate-shaped members of the second wall surface member 28b are provided on the second rotating body 28a so as to have a positional relationship symmetrical with respect to the rotation center AX.

The triangular plate-shaped members of the first wall surface member 24b and the second wall surface member 28b are both the first rotating body 24a and the first rotating body member 24a in a state where the first piston member 24 and the second piston member 28 are housed in the housing 4. It is formed so as to match the cross-sectional shape of a triangle formed by the recess between the second rotating body 28a and the inner peripheral surface of the housing 4. Further, the outer peripheral portions of the triangular plate-shaped members of the first wall surface member 24b and the second wall surface member 28b are configured to be slidable with the inner peripheral surface of the housing 4.

Seals and the like are appropriately provided on the contact portion and the sliding portion between the members. The first output shaft 16 is connected to the first piston member 24 so that the rotation centers AX coincide with each other. The second output shaft 18 is connected to the second piston member 28 so that the rotation center AX coincides with the second piston member 28. Further, for example, one-way clutches 22 and 26 are provided between each of the first rotating body 24a and the second rotating body 28a and the housing 4. The one-way clutch 22 allows the first piston member 24 to rotate in the housing 4 in a predetermined rotation direction, and suppresses the rotation in the direction opposite to the rotation direction. Similarly, the one-way clutch 26 allows the second piston member 28 to rotate in the housing 4 in a predetermined rotation direction, and suppresses the rotation in the direction opposite to the rotation direction.

<Configuration other than engine 2>
Returning to FIGS. 1 and 2, the configuration of the engine device 1 other than the engine 2 will be described below.

Both the first output shaft 16 and the second output shaft 18 rotate due to the combustion of fuel in the housing 4. The rotary electric machine device 60 has a first MG (Motor Generator) 61 and a second MG (Motor Generator) 62. The first output shaft 16 is connected to the rotation shaft of the first MG61. The second output shaft 18 is connected to the rotation shaft of the second MG 62.

The first MG61 and the second MG62 are, for example, both three-phase AC rotary electric machines. Both the first inverter 71 and the second inverter 72 are power conversion devices configured to enable power conversion between DC power and AC power. The first MG61 corresponds to the first rotary electric machine in the embodiment. The second MG 62 corresponds to the second rotary electric machine in the embodiment.

The first MG 61 is electrically connected to the first inverter 71. The first inverter 71 is controlled by the control signal INV1 from the control device 200. That is, the electric power transferred between the first MG 61 and the first inverter 71 is controlled by the control signal INV1 from the control device 200.

The control device 200 controls the first inverter 71 so that the regenerative torque is generated in the first MG 61, for example. At this time, the regenerative power generated in the first MG 61 is converted from AC power to DC power in the first inverter 71 and supplied to the battery 80. The battery 80 is charged by the DC power supplied from the first inverter 71. The first MG 61 is connected to the first piston member 24 via the first output shaft 16, and the first MG 61 is configured to be capable of regenerative power generation by the rotation of the first piston member 24.

Alternatively, the control device 200 controls the first inverter 71 so that the drive torque is generated in the first MG 61. At this time, the power of the battery 80 is converted from DC power to AC power in the first inverter 71 and supplied to the first MG 61. The first MG 61 is connected to the first piston member 24 via the first output shaft 16, and the first MG 61 is configured to be able to rotationally drive the first piston member 24.

The control device 200 controls the rotational operation of the first piston member 24 by transmitting the control signal INV1 to the first inverter 71.

The first resolver 101 detects the rotation angle (hereinafter, referred to as the rotation angle CA1) of the rotation axis (first output shaft 16) of the first MG61. The first resolver 101 transmits a signal indicating the detected rotation angle CA1 to the control device 200.

The second MG 62 is electrically connected to the second inverter 72. The second inverter 72 is controlled by the control signal INV2 from the control device 200. That is, the electric power transferred between the second MG 62 and the second inverter 72 is controlled by the control signal INV2 from the control device 200.

The control device 200 controls the second inverter 72 so that the regenerative torque is generated in the second MG 62, for example. At this time, the regenerative power generated in the second MG 62 is converted from AC power to DC power in the second inverter 72 and supplied to the battery 80. The battery 80 is charged by the DC power supplied from the second inverter 72. The second MG 62 is connected to the second piston member 28 via the second output shaft 18, and the second MG 62 is configured to be capable of regenerative power generation by the rotation of the second piston member 28.

Alternatively, the control device 200 controls the second inverter 72 so that the drive torque is generated in the second MG 62. At this time, the power of the battery 80 is converted from DC power to AC power in the second inverter 72 and supplied to the second MG 62. The second MG 62 is connected to the second piston member 28 via the second output shaft 18, and the second MG 62 is configured to be able to rotationally drive the second piston member 28.

The control device 200 controls the rotational operation of the second piston member 28 by transmitting the control signal INV2 to the second inverter 72.

The second resolver 102 detects the rotation angle (hereinafter, referred to as the rotation angle CA2) of the rotation axis (second output shaft 18) of the second MG 62. The second resolver 102 transmits a signal indicating the detected rotation angle CA2 to the control device 200.

The battery 80 is a DC power source composed of a secondary battery such as a nickel hydrogen battery or a lithium ion battery. The battery 80 may be a power storage device capable of storing DC power supplied from the first inverter 71 or the second inverter 72, and for example, a capacitor or the like may be used instead of the battery 80.

The operation of the engine device 1 is controlled by the control device 200. The control device 200 includes a CPU (Central Processing Unit) that performs various processes, a memory that includes a ROM (Read Only Memory) that stores programs and data, a RAM (Random Access Memory) that stores the processing results of the CPU, and the like. Includes input / output ports (neither shown) for exchanging information with the outside. The above-mentioned sensors (for example, the first resolver 101 and the second resolver 102) are connected to the input port. Devices to be controlled (for example, engine 2, first inverter 71, second inverter 72, etc.) are connected to the output port.

The control device 200 controls various devices so that the engine device 1 is in a desired operating state based on the signals from each sensor and the device, and the map and the program stored in the memory. Note that various controls are not limited to software processing, but can also be processed by dedicated hardware (electronic circuits).

<Operation of engine device 1>
In the engine device 1 having the above configuration, the operations of the combustion chamber and the piston member formed in the housing 4 will be described below. 4 to 7 are schematic views for explaining the operation of the combustion chambers C1 to C4 and the engine 2.

4 to 7 show a cross section orthogonal to the rotation center AX at the central portion of the housing 4 (for example, the contact portion between the first rotating body 24a and the second rotating body 28a). As shown in FIGS. 4 to 7, in the housing 4, four combustion chambers C1 for burning fuel by the inner peripheral surface 4 m of the housing 4, the first piston member 24, and the second piston member 28 are used. ~ C4 is formed. The first wall surface member 24b and the second wall surface member 28b form a wall surface in the circumferential direction of the combustion chambers C1 to C4. The two combustion chambers adjacent to each other in the circumferential direction are separated by a first wall surface member 24b and a second wall surface member 28b.

The first wall surface member 24b of the first piston member 24 has two plate-shaped members 24b1, 24b2. The plate-shaped members 24b1, 24b2 can rotate integrally around the rotation center AX. The plate-shaped member 24b1 has a front surface 24m1 in the rotation direction of the first piston member 24 and a rear surface 24n1 in the rotation direction. The plate-shaped member 24b2 has a front surface 24m2 in the rotation direction of the first piston member 24 and a rear surface 24n2 in the rotation direction.

The second wall surface member 28b of the second piston member 28 has two plate-shaped members 28b1, 28b2. The plate-shaped members 28b1, 28b2 can rotate integrally around the rotation center AX. The plate-shaped member 28b1 has a front surface 28m1 in the rotation direction of the second piston member 28 and a rear surface 28n1 in the rotation direction. The plate-shaped member 28b2 has a front surface 28m2 in the rotation direction of the second piston member 28 and a rear surface 28n2 in the rotation direction.

The combustion chamber C1 is defined by an inner peripheral surface 4 m of the housing 4, a front surface 24 m1 of the plate-shaped member 24b1, and a rear surface 28n1 of the plate-shaped member 28b1. The combustion chamber C2 is defined by an inner peripheral surface 4 m of the housing 4, a front surface 28 m2 of the plate-shaped member 28b2, and a rear surface 24n1 of the plate-shaped member 24b1. The combustion chamber C3 is defined by an inner peripheral surface 4 m of the housing 4, a front surface 24 m2 of the plate-shaped member 24b2, and a rear surface 28n2 of the plate-shaped member 28b2. The combustion chamber C4 is defined by an inner peripheral surface 4 m of the housing 4, a front surface 28 m1 of the plate-shaped member 28b1, and a rear surface 24n2 of the plate-shaped member 24b2.

In FIGS. 4 to 7, the one-way clutches 22 and 26 shown in FIG. 3 suppress the counterclockwise rotation of the first piston member 24 and the second piston member 28, and allow the clockwise rotation. The clockwise direction in FIGS. 4 to 7 corresponds to one direction in the embodiment. The combustion chamber C4, the combustion chamber C3, the combustion chamber C2, and the combustion chamber C1 are arranged in this order in this one direction.

In the combustion chamber C1 shown in FIG. 4, the air-fuel mixture of the compressed air and the fuel is ignited by self-ignition. When the fuel burns in the combustion chamber C1, the pressure in the combustion chamber C1 rises sharply. The pressure in the combustion chamber C1 acts as a counterclockwise force on the front surface 24m1 of the plate-shaped member 24b1 in the counterclockwise direction in the drawing, and acts on the rear surface 28n1 of the plate-shaped member 28b1 in the clockwise direction in the drawing. Acts as a force. The counterclockwise movement of the first piston member 24 is suppressed by the one-way clutch 22. Therefore, the pressure increase in the combustion chamber C1 causes only the second piston member 28 of the first piston member 24 and the second piston member 28 to be rotationally driven.

As shown in FIG. 5, the rotational position of the first piston member 24 is maintained, while the second piston member 28 is in the clockwise direction in the drawing (one direction described above) along the solid line arrow in the drawing. Rotate to. In the combustion chamber C1, the expansion stroke is such that the volume of the combustion chamber C1 increases with the expansion of the gas in the combustion chamber C1. The solid arrow shown in FIG. 5 indicates an accelerated rotational motion in which the second piston member 28 rotates while accelerating. The control device 200 shown in FIG. 1 utilizes the rotation of the second piston member 28 to cause the second MG 62 connected to the second piston member 28 to generate regenerative power. The electric power generated by the second MG 62 is stored in the battery 80 shown in FIG.

When the second piston member 28 rotates in one direction due to the combustion of fuel in the combustion chamber C1, the rotational position of the first piston member 24 is maintained, so that the volume of the combustion chamber C4 decreases. At this time, the combustion chamber C4 communicates with the exhaust pipe 8. Therefore, the exhaust gas in the combustion chamber C4 is discharged to the exhaust pipe 8 as the volume of the combustion chamber C4 decreases. In the combustion chamber C4, the expanded exhaust gas is discharged from the exhaust pipe 8.

On the other hand, the combustion chamber C2 shown in FIG. 4 communicates with the intake pipe 6. Therefore, the air-fuel mixture is sucked into the combustion chamber C2 from the intake pipe 6. In the combustion chamber C2, the intake stroke is such that the air-fuel mixture is sucked from the intake pipe 6.

The combustion chamber C2 is not in communication with the intake pipe 6 while the second piston member 28 is rotating in one direction due to the combustion of fuel in the combustion chamber C1. When the second piston member 28 further rotates, the rotational position of the first piston member 24 is maintained, so that the volume of the combustion chamber C2 decreases. At this time, as shown in FIG. 5, since the combustion chamber C2 does not communicate with either the intake pipe 6 or the exhaust pipe 8, the air-fuel mixture in the combustion chamber C2 is compressed due to the decrease in the volume of the combustion chamber C2. Will be done. In the combustion chamber C2, the compression stroke is such that the air-fuel mixture sucked from the intake pipe 6 is compressed.

In the combustion chamber C3 shown in FIG. 4, when the second piston member 28 rotates in one direction due to the combustion of fuel in the combustion chamber C1, the rotational position of the first piston member 24 is maintained, so that the volume increases. The combustion chamber C3 communicates with the intake pipe 6 while the second piston member 28 is rotating. At this time, as shown in FIG. 5, as the volume of the combustion chamber C3 increases, the air-fuel mixture is sucked into the combustion chamber C3 from the intake pipe 6. In the combustion chamber C3, the intake stroke is such that the air-fuel mixture is sucked from the intake pipe 6.

As shown in FIG. 6, when the second piston member 28 further rotates, the air-fuel mixture in the combustion chamber C2 is further compressed, and the pressure in the combustion chamber C2 rises. The gas with increased pressure in the combustion chamber C2 acts on the front surface 28m2 of the plate-shaped member 28b2 with a force in the counterclockwise direction in the drawing, so that the second piston member 28 is decelerated. The broken line arrows in FIGS. 6 and 7 indicate a deceleration rotation motion in which the first piston member 24 and the second piston member 28 rotate while decelerating.

On the other hand, the first piston member 24 is driven by the first MG61 and rotates in one direction. The first MG 61 assists the first piston member 24 so that the second piston member 28 does not come too close to the first piston member 24. The white arrows in FIG. 6 indicate the rotational movement of the first piston member 24 due to the driving torque generated by the first MG61. As shown in FIG. 6, the control device 200 shown in FIG. 1 generates a driving torque in the first MG 61 connected to the first piston member 24 while the second piston member 28 is rotating in one direction. The first piston member 24 is rotationally driven.

As shown in FIG. 7, the volume of the combustion chamber C2 is further reduced by further rotation of the second piston member 28, and the pressure in the combustion chamber C2 is further increased, so that the second piston member 28 is decelerated and rotated. Continue exercising. On the other hand, when the control device 200 regenerates power to the first MG 61 connected to the first piston member 24 by utilizing the rotation of the first piston member 24, the first piston member 24 also decelerates and rotates. .. When the supply of the driving torque from the first MG 61 to the first piston member 24 is stopped, the first piston member 24 is further decelerated.

When the first piston member 24 rotates until the position of the second piston member 28 shown in FIG. 4 is reached, and the second piston member 28 rotates until the position of the first piston member 24 shown in FIG. 4 is reached. The fuel burns in the combustion chamber C2. The increase in pressure in the combustion chamber C2 rotationally drives the first piston member 24. The rotation of the first piston member 24 causes the first MG 61 to regenerate power. The second piston member 28 rotates in response to the driving torque of the second MG 62. As both the first piston member 24 and the second piston member 28 rotate, the first piston member 24 and the second piston member 28 return to the arrangement shown in FIG.

In this way, each time combustion is performed in any of the combustion chambers C1 to C4, one of the piston members of the first piston member 24 and the second piston member 28 burns the fuel in the combustion chamber. It is driven to rotate by the pressure rise due to. The engine 2 operates by alternately rotating the first piston member 24 and the second piston member 28. In the combustion chamber C1, the combustion chamber C2, the combustion chamber C3, and the combustion chamber C4, a cycle consisting of an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke is repeated.

When the pressure rise in the combustion chamber due to the combustion of fuel in the combustion chamber rotationally drives the second piston member 28, the control device 200 generates a drive torque in the first MG 61 during the rotation of the second piston member 28. , The first piston member 24 is rotationally driven. When the pressure rise in the combustion chamber due to the combustion of fuel in the combustion chamber rotationally drives the first piston member 24, the control device 200 generates a drive torque in the second MG 62 during the rotation of the first piston member 24. , The second piston member 28 is rotationally driven.

When the fuel burns in the combustion chamber, one of the piston members, the first piston member 24 and the second piston member 28, is rotationally driven by the pressure in the combustion chamber. In this case, the rotary electric machine is generated in the other piston member before the one piston member rotates to the position where the other piston member is arranged at the start of combustion. It rotates with the driving torque and changes its position. As a result, the collision between the first piston member 24 and the second piston member 28 is surely avoided, so that the operation of the engine 2 can be stably continued.

In order to avoid collision between the first piston member 24 and the second piston member 28, the piston member that is rotationally driven by the pressure rise in the combustion chamber is not rotated by the drive torque of the rotary electric machine, but by the pressure rise in the combustion chamber. The piston member that is not rotationally driven is rotated by the driving torque of the rotary electric machine. As a result, the driving work generated by the rotating electric machine to rotate the piston member becomes relatively small. Generating drive work in the rotary electric machine causes energy loss, but by controlling the drive work of the rotary electric machine to be small, the loss during operation of the engine 2 can be reduced. Therefore, the fuel efficiency of the engine 2 can be improved. Since it is not necessary to increase the size of the rotary electric machine in order to secure the driving force, the engine device 1 can be miniaturized.

In the above-described embodiment, an example in which the first MG 61 is connected to the first piston member 24 and the second MG 62 is connected to the second piston member 28 has been described. Instead of the configuration in which the plurality of piston members are connected to different rotary electric machines, the engine device 1 may be provided with one rotary electric machine in which the engine device 1 is selectively connected to any one of the plurality of piston members. For example, a clutch may be used to switch between when the rotary electric machine and the first piston member 24 are connected and when the rotary electric machine and the second piston member 28 are connected.

Hereinafter, examples will be described. The loss caused by generating the drive torque in the rotary electric machine was compared between the case where the leading rotor was driven by the rotary electric machine and the case where the trailing rotor was driven by the rotary electric machine. Here, the leading rotor means a piston member located on the downstream side in the rotation direction with respect to the combustion chamber in the compression stroke, and the follow-up rotor means on the upstream side in the rotation direction with respect to the combustion chamber in the compression stroke. A piston member. For example, in FIG. 6, the first piston member 24 is the leading rotor and the second piston member 28 is the trailing rotor.

FIG. 8 is a graph showing a change in phase with time when the leading rotor is driven. FIG. 9 is a graph showing a change in the number of revolutions with respect to time when the leading rotor is driven. FIG. 10 is a graph showing a change in motor torque with respect to time when the leading rotor is driven. FIG. 11 is a graph showing the change in phase with respect to time when the follow-up rotor is driven. FIG. 12 is a graph showing a change in the number of revolutions with respect to time when the follow-up rotor is driven. FIG. 13 is a graph showing the change in motor torque with respect to time when the follow-up rotor is driven.

The horizontal axis of each of FIGS. 8 to 13 indicates time. The time when combustion starts in the combustion chamber is set to time 0. The vertical axis of FIGS. 8 and 11 shows the phases of the leading rotor and the trailing rotor. The vertical direction in the drawings in FIGS. 4 to 7 is defined as the angle of phase 0. The vertical axis of FIGS. 9 and 12 shows the rotation speeds of the leading rotor and the trailing rotor. The vertical axes of FIGS. 10 and 13 show the torque (motor torque) of the rotary electric machine connected to each of the leading rotor and the trailing rotor. It is assumed that the regenerative electric machine is generating regenerative power in the range where the motor torque is negative. It is assumed that the rotary electric machine generates the drive torque within the positive range of the motor torque.

In FIGS. 8 to 10, while the follow-up rotor is rotating due to the pressure rise in the combustion chamber, a drive torque is generated in the rotary electric machine connected to the leading rotor to rotationally drive the leading rotor. The area of the hatched area in FIG. 10 is the area where the drive torque is integrated, and corresponds to the amount of drive work generated by the rotary electric machine.

In FIGS. 11 to 13, while the follow-up rotor is rotating due to the pressure rise in the combustion chamber, a drive torque is generated in the rotary electric machine connected to the follow-up rotor to rotationally drive the follow-up rotor. The area of the hatched area in FIG. 13 is the area where the drive torque is integrated, and corresponds to the amount of drive work generated by the rotary electric machine.

Comparing FIGS. 10 and 13, the area of the hatched region was smaller in FIG. 10 for driving the leading rotor, and the driving work generated by the rotary electric machine was smaller. Therefore, it has been shown that the loss during operation of the engine can be further reduced and the fuel efficiency of the engine can be improved by controlling the leading rotor to be rotationally driven instead of the trailing rotor by the driving torque generated by the rotary electric machine.

The embodiments and examples disclosed this time should be considered as exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims, not the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 engine unit, 2 engine, 4 housing, 4m inner peripheral surface, 16 1st output shaft, 18 2nd output shaft, 22,26 one-way clutch, 24 1st piston member, 24a 1st rotating body, 24b1, 24b2, 28b1 , 28b2 plate-shaped member, 24b first wall member, 24m1,24m2, 28m1,28m2 front surface, 24n1,24n2, 28n1,28n2 rear surface, 28 second piston member, 28a second rotating body, 28b second wall member, 60 rotary electric machine, 61 1st MG, 62 2nd MG, 71 1st inverter, 72 2nd inverter, 200 controller, AX rotation center, C1, C2, C3, C4 combustion chamber.

Claims (3)

A housing, a first piston member rotatably supported in the housing about the center of rotation in one direction, and a second piston rotatably supported in the housing about the center of rotation in one direction. A rotary piston type engine, including a member, wherein the housing, the first piston member, and the second piston member form a combustion chamber for burning fuel.
A rotary electric device that rotationally drives the first piston member and the second piston member, and
When the pressure increase in the combustion chamber due to the combustion of the fuel in the combustion chamber rotationally drives one of the first piston member and the second piston member, the one piston member. It includes a control device that generates a drive torque in the rotary electric device during rotation to control the first piston member and any one of the second piston members to be rotationally driven. , Engine equipment. The rotary electric machine is connected to the first piston member and rotationally drives the first piston member, and is connected to the second piston member and rotationally drives the second piston member. The engine device according to claim 1, further comprising a rotary electric machine. The engine device according to claim 1 or 2, wherein the control device utilizes the rotation of the first piston member and the second piston member due to the pressure increase in the combustion chamber to cause the rotary electric device to generate regenerative power generation. ..

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