DE102017119997A1 - Power transmission system and control device - Google Patents

Abstract

A power transmission system for a vehicle includes: a power transmission device; and a control device configured to control the power transmission device. The power transmission device has: a stepped variable speed transmission; a first rotary element; a second rotary element; a third rotary element; a fourth rotary element; a first switching mechanism; a second switching mechanism; and a third switching mechanism. The stepped variable speed transmission has: a first shaft; a second shaft parallel to the first shaft; a plurality of speed stages each having a drive gear and an output gear and having different gear ratios from each other, the drive gear being rotated by the first shaft and the output gear meshing with the drive gear directly or via a follower to rotate the second shaft; and a selection mechanism that selects one of the gear ratios, wherein the stepped variable transmission transmits rotation of the first shaft to the second shaft via the gear ratio selected by the selection mechanism.

Description

TERRITORY

Embodiments described herein generally relate to a power transmission system and a control device.

BACKGROUND

Conventionally, a power transmission system is known which can selectively connect a motor generator to a machine or a stepped variable speed transmission. An example of the prior art is in Japanese Patent Application Publication No. 2010-2083676 described.

SUMMARY

In the power transmission system, as described above, for example, it is desirable to make the delay until movement of the vehicle starts to be minimum when an accelerator operation device is operated while the vehicle is stopped at the start of the vehicle.

One of objects of the embodiments is to achieve a power transmission system and a control device that have a new design that offers fewer disadvantages, and that allows, for example, the vehicle to finish faster for launching.

According to an embodiment, a power transmission system for a vehicle has, for example: a power transmission device; and a control device configured to control the power transmission device. The power transmission device has: a stepped variable speed transmission; a first rotary element; a second rotary element; a third rotary element; a fourth rotary element; a first switching mechanism; a second switching mechanism; and a third switching mechanism. The stepped variable speed transmission has: a first shaft; a second shaft parallel to the first shaft; a plurality of speed stages each having a drive gear and an output gear and having different gear ratios from each other, the drive gear being rotated by the first shaft and the output gear meshing with the drive gear directly or via a follower to rotate the second shaft; and a selection mechanism that selects one of the gear ratios, wherein the stepped variable transmission transmits rotation of the first shaft to the second shaft via the gear ratio selected by the selection mechanism. The first rotary element rotates locked with a shaft of a motor generator. The second rotary member is rotatable locked to a shaft of a machine. The third rotary element rotates locked with the second shaft. The fourth rotary element rotates locked with the first shaft. The first switching mechanism is switched between a first rotation transmitting state and a first rotation stopping state, wherein the first rotation transmitting state is a state in which rotation is transmitted between the first rotating element and the second rotating element, and the first rotation stopping state is a state in which no rotation between is transmitted to the first rotary member and the second rotary member. The second switching mechanism is switched between a second rotation transmitting state and a second turning-off state, wherein the second rotation transmitting state is a state in which rotation is transmitted between the first rotating element and the third rotating element, and wherein the second turning-off state is a state in which no rotation is transmitted between the first rotary member and the third rotary member. The third switching mechanism is switched between a third rotation transmitting state and a third rotation stopping state, wherein the third rotation transmitting state is a state in which rotation is transmitted between the first rotating element and the fourth rotating element, and wherein the third rotation stopping state is a state in which no rotation is transmitted between the first rotary member and the fourth rotary member. The control device has a first switching control means configured to set the second switching mechanism in the second rotation interrupting state, setting the first switching mechanism in the first rotation transmitting state, and setting the third switching mechanism in the third rotation transmitting state when a first predetermined speed step is selected while the vehicle and the machine are stopped. Thereby, for example, the first switching mechanism from the rotation-stopped state to the rotation-transmitting state becomes simultaneously with or before switching of the third switching mechanism from the rotation-stopped state to the rotation-transmitting state. This configuration enables the vehicle to finish faster for startup as compared with a configuration in which the first switching mechanism is switched from the rotation-stopped state to the rotation-transmitted state after the third switching mechanism is switched from the rotation-stopped state to the rotation-transmitted state. In addition, the vehicle can start more gently by a moment of the engine and the motor generator.

For example, according to an embodiment of the power transmission system, the control device has a second switching control means configured to set the first switching mechanism in the first rotation interrupting state in a state where the engine is not started after start control by the first switching control device when a required acceleration is less than a predetermined threshold and greater than zero. This configuration allows, for example, the vehicle to switch to the mode in which the vehicle is approached by the moment of the motor generator when the required acceleration is relatively small. Thus, for example, a more efficient way of starting according to the required acceleration can be selected.

For example, according to an embodiment of the power transmission system, the second switching control means is further configured to set the first switching mechanism in the first rotation-stopped state in a state where the engine is started after an end of the control by the first switching control means, when the required acceleration is the same or greater than the predetermined threshold. This configuration may, for example, reduce transmission of vibration resulting from rotation change of the engine to the vehicle via the first switching mechanism after starting the engine.

For example, according to an embodiment of the power transmission system, the control device has third switching control means configured to set the second switching mechanism in the second rotation-stopping state, setting the third switching mechanism in the third rotation-stopping state, and setting the first switching mechanism to the first rotation transmitting state, if any second predetermined gear is selected while the vehicle and the engine are stopped. For example, this design can reduce wasteful energy consumption required to activate the switching mechanisms, which is unnecessary when the engine generator torque is not used to start the vehicle.

According to an embodiment of the power transmission system, the control device is configured, for example, to set the second switching mechanism in the second rotation transmission state or the third switching mechanism in the third rotation transmission state and to put the first switching mechanism in the first rotation interrupted state, in a state in which the engine is started after an end of a control of the third switching control device when a required acceleration is equal to or greater than a predetermined threshold. Thereby, for example, a driving mode of the vehicle is smoothly changed when the required acceleration is relatively large.

For example, according to an embodiment of the power transmission system, the control device is configured to execute control by the first switching control device when a value indicative of the charge amount of a vehicle battery is greater than a predetermined threshold. For example, this configuration can prevent an excessive reduction in the amount of charge of a vehicle battery.

For example, according to an embodiment of the power transmission system, the first switching mechanism has a fixed part and a movable part, the movable part moving in an axial direction between a connected position and a non-connected position, the connected position being a position in which the movable part engages with the fixed part, wherein the unconnected position is a position in which the movable part is separated from the fixed part, wherein one of the fixed part and the movable part is disposed on one side of the engine and the other of the fixed part and the movable part is disposed on one side of the motor generator, and wherein the control device is configured to control an actuator to apply a force to the movable part when the engine generator starts the engine, the force being axially directed from the connected position to the disengaged position and causing no movement of the movable part from the connected position to the unconnected position in a state where a rotation change of the engine is less than a predetermined threshold. This configuration may suppress, for example, transmission of vibration resulting from the rotational change of the engine via the first switching mechanism after starting the engine.

For example, according to an embodiment of the power transmission system, the first switching mechanism has a fixed part and a movable part, the movable part moving in an axial direction between a connected position and a non-connected position, the connected position being a position in which the movable part engages with the fixed part, wherein the unconnected position is a position in which the movable part is separated from the fixed part, wherein one of the fixed part and the movable part is arranged on one side of the machine and the other of the fixed The first switching mechanism has at least one of a front inclined surface and a rear inclined surface, the front inclined surface on a front surface in a first rotational direction of one of the fixed Part and the bewe the same part is arranged and extends rearwardly in the first rotational direction to a tip end, wherein the rear inclined surface is arranged on a rear surface in a second rotational direction of the other of the fixed part and the movable part and forward in the second direction of rotation extends to a tip end. As a result, when the front inclined surface or the rear inclined surface contacts the tooth facing the inclined surface due to an increase in the rotational change of the engine after starting, the movable member can not contact the fixed part from the connected position with the fixed part move the connected position. Thus, for example, the first switching mechanism reaches the rotation-stopping state faster after the engine starts by the motor generator, thereby suppressing transmission of noise or vibration resulting from rotation change of the engine.

BRIEF DESCRIPTION OF THE DRAWINGS

1 FIG. 10 is an exemplary and schematic diagram illustrating a configuration of a power transmission device according to an embodiment; FIG.

2 FIG. 15 is an exemplary and schematic diagram illustrating a gear train of the power transmission device in the embodiment; FIG.

3 FIG. 10 is an exemplary and schematic block diagram illustrating a control device of the power transmission system in the embodiment; FIG.

4 FIG. 10 is an exemplary flowchart illustrating an example of a control flow in the power transmission system of the embodiment; FIG.

5 FIG. 10 is an exemplary and schematic diagram illustrating a part configuration of an example of a first switching mechanism of the power transmission device in the embodiment; FIG.

6 is an exemplary and schematic diagram illustrating a part of another, from 5 a different example of the first switching mechanism of the power transmission device in the embodiment;

7 FIG. 10 is an exemplary timing chart illustrating an example of operation of each unit of the power transmission system in the embodiment; FIG.

8th is an exemplary timing diagram that is another of 7 illustrates a distinctive example of an operation of each unit of the power transmission system in the embodiment; and

9 is an exemplary timing diagram that is another of 7 and 8th illustrates a distinctive example of an operation of each unit of the power transmission system in the embodiment.

DETAILED DESCRIPTION

The following describes exemplary embodiments of the following invention. The following configurations of the embodiments and effects, results and effects caused by these configurations are merely exemplary. The present invention can be realized with a configuration different from the configurations disclosed in the following embodiments. According to the present invention, at least one of various effects and derived effects that can be achieved with the designs can be achieved.

1 FIG. 10 is an exemplary and schematic diagram showing a configuration of a power transmission device. FIG 1 represents according to one embodiment. As in 1 has the power transmission device 1 a stepped variable transmission 100 , a switching unit 200 and a housing 1a , The stepped variable transmission 100 and the switching unit 200 are in the case 1a added.

The stepped variable transmission 100 is for example a manual transmission (MT) or an automated manual transmission (AMT). The stepped variable transmission 100 may be a dual-clutch transmission (DCT) with parallel clutches C. The stepped variable transmission 100 may be due to manual operation by a driver or by a control device 8th via an actuator (not shown) are geared.

The switching unit 200 has a first switching mechanism 210 , a second switching mechanism 220 and a third switching mechanism 230 , The first switching mechanism 210 is switched between a rotation transmission state (first rotation transmission state) in which rotation is transmitted between a motor generator MG and an engine EG, and a rotation stop state (first rotation stop state) in which no rotation is transmitted between the motor generator MG and the engine EG. The second switching mechanism 220 is switched between a rotation transmission state (second rotation transmission state) in which rotation between the motor generator MG and wheels W is transmitted, and a rotation interruption state (second rotation stop state) in which rotation between the motor generator MG and the wheels W is not transmitted. The third switching mechanism 230 is set between a rotation transmission state (third rotation transmission state) in which rotation between the motor generator MG and an input shaft (first shaft) 11 of the stepped variable transmission 100 is transferred, and a rotation interruption state (third rotation interruption state) is switched, in which no rotation between the motor generator MG and the input shaft 11 is transmitted. A clutch C becomes between a rotation transmission state (fourth rotation transmission state) in which rotation between the engine EG and the stepped variable transmission 100 is transferred, and a rotation interruption state (fourth rotation interruption state) is switched, in which no rotation between the engine EG and the stepped variable transmission 100 is transmitted. The control device 8th controls an actuator 81 (please refer 2 ) about the rotation transmitting state and the rotation interrupting state of the first switching mechanism 210 , the second switching mechanism 220 and the third switching mechanism 230 switch. The control device 8th may be designed to be an actuator (in 1 not shown) to switch the rotation transmission state and the rotation-cut state of the clutch C. The control device 8th may control the actuator on the basis of the operation amount of a clutch pedal or on the basis of states of the vehicle to adjust the transmission torque in the clutch C. In the embodiment, various drive modes (to be described later) can be changed by switching the rotation transmission state and the rotation-stopping state of the first switching mechanism 210 , the second switching mechanism 220 , the third switching mechanism 230 and the clutch C can be realized.

2 FIG. 10 is an exemplary and schematic diagram illustrating a gear train of the power transmission device. FIG 1 represents in the embodiment. As in 2 is shown, has the stepped variable transmission 100 the input shaft 11 , a first output shaft 21 and a second output shaft 22 , The input shaft 11 , the first output shaft 21 and the second output shaft 22 are arranged with a space parallel to each other. The input shaft 11 rotates about a rotational center Ax11, the first output shaft 21 rotates about a rotational center Ax21 and the second output shaft 22 turns around a center of rotation Ax22. Each of the rotational axes Ax11, Ax21 and Ax22 may also be referred to as a rotation axis. The input shaft 11 is an example of the first wave, and the first output wave 21 and the second output shaft 22 are an example of the second wave. The rotational center Ax11 is an example of the first rotational center, and the rotational axes Ax21 and Ax22 are an example of the second rotational center.

An end gear 21f at the first output shaft 21 is provided, and an end gear 22f at the second output shaft 22 is provided, both engage with a differential plate 92 a, on a housing 91 a differential gear DF is arranged. The differential gear DF is connected to the wheels W (see 1 ).

The stepped variable transmission 100 has drive gears 31 . 32 . 335 . 346 and 3r , The drive gears 31 . 32 . 335 . 346 and 3r are at the input shaft 11 fixed and rotate about the center of rotation Ax11 integral with the input shaft 11 ,

A rotation of the engine EG (internal combustion engine) becomes the input shaft 11 transmitted via the clutch C. The clutch C is what is called a friction clutch. The clutch C may be between the rotation transmitting state (connected state) in which rotation of a shaft 1e the engine EG to the input shaft 11 is transmitted, and the rotation interruption state (unconnected state) are transmitted, in which the shaft 1e from the input shaft 11 is disconnected. The rotational transmission state of the clutch C includes a half-clutch state in which the clutch C is rotated by the shaft 1e to the input shaft 11 transfers while she is slipping. For example, in a design where the stepped variable transmission 100 is switched by the manual operation by the driver, the state of the clutch C according to an electromagnetic operation of an actuator (not shown) which is controlled on the basis of an operation amount of the operation unit (not shown) by the driver or on the basis of states of the vehicle. The state of the clutch C may be switched according to the manual operation of the operating unit (not shown) by the driver or according to the electromagnetic operation of the actuator, which is controlled on the basis of the state of the vehicle. In a design, for example, in which the stepped variable transmission 100 Instead of being automatically shifted by the manual operation by the driver, the state of the clutch C may be switched in accordance with the electromagnetic operation of an actuator (not shown) controlled on the basis of the conditions of the vehicle. It should be noted that the operating unit referred to here is, for example, the clutch pedal.

The stepped variable transmission 100 has output gears 41 . 42 . 43 . 44 . 45 . 46 and 4r , The output gears 41 . 43 . 44 and 4r can be integral with the first output shaft about the center of rotation Ax21 21 rotate. The output gears 42 . 45 and 46 can be integral with the second output shaft about the center of rotation Ax22 22 rotate.

The stepped variable transmission 100 has several gears 51 to 56 and 5r , The gear ratio 51 has the drive gear 31 and the output gear 41 that with the drive gear 31 intervenes. The gear ratio 52 has the drive gear 32 and the output gear 42 that with the drive gear 32 intervenes. The gear ratio 53 has the drive gear 335 and the output gear 43 that with the drive gear 335 intervenes. The gear ratio 54 has the drive gear 346 and the output gear 44 that with the drive gear 346 intervenes. The gear ratio 55 has the drive gear 335 and the output gear 45 that with the drive gear 335 intervenes. The gear ratio 56 has the drive gear 346 and the output gear 46 that with the drive gear 346 intervenes. The gear ratio 5r has the drive gear 3r , a idler gear 6r acting as a follower with the drive gear 3r engages, an outer shaft 6O , an output connection gear 6o that on the outer shaft 6O is fixed, and the output gear 4r that with the output connection gear 6o intervenes. The gear ratio 53 and the gear ratio 55 share the drive gear 335 , and the gear ratio 54 and the gear ratio 56 share the drive gear 346 , The gears 51 to 56 are forward gears, which are set to different gear ratios. The gear ratio 5r is a reverse gear. The gear stage may be referred to as a shift stage.

The stepped variable transmission 100 has a selection mechanism. The selection mechanism has a variety of moving parts 71 . 72 . 734 . 756 and 7r , Each of the moving parts 71 . 72 . 734 . 756 turns integrally with the first output shaft 21 or the second output shaft 22 , The moving part 7r turns integrally with the outer shaft 6O , Each of the moving parts 71 . 72 . 734 . 756 and 7r is movable between at least two positions along the axial direction of the first output shaft 21 , the second output shaft 22 or the outer shaft 6O intended. The two positions include a connected position (engaged position) in which the moving parts 71 . 72 . 734 . 756 and 7r engage with fixed parts on their respective gears, and an unconnected position (separate position, neutral position) in which the moving parts 71 . 72 . 734 . 756 and 7r are separated from the solid parts. The moving parts 71 . 72 . 734 . 756 and 7r and the solid parts may form, for example, a dog clutch. In this case, for example, each of the moving parts 71 . 72 . 734 . 756 and 7r a sleeve, and each of the fixed parts, for example, dog teeth, which engage with the sleeve. The dog clutch may have a synchronization device.

The moving part 71 moves between the connected position and the disconnected position of the first output shaft 21 and the output gear 41 , In the connected position, the movable part engages 71 with dog teeth of the output gear 41 one.

The moving part 72 moves between the connected position and the unconnected position of the second output shaft 22 and the output gear 42 ,

The moving part 734 moves between the connected position of the first output shaft 21 and the output gear 43 , the connected position of the first output shaft 21 and the output gear 44 , and the unconnected position of the first output shaft 21 and the output gears 43 and 44 , The unconnected position of the moving part 734 is between the two connected positions of the moving part 734 , The moving part 734 is between the output gear 43 and the output gear 44 positioned.

The moving part 756 moves between the connected position of the second output shaft 22 and the output gear 45 , the connected position of the second output shaft 22 and the output gear 46 and the disconnected position of the second output shaft 22 and the output gears 45 and 46 , The unconnected position of the moving part 756 is between the two connected positions of the moving part 756 ,

The moving part 756 is between the output gear 45 and the output gear 46 positioned.

The moving part 7r moves between the connected position of the outer shaft 6O and idler gear 6r and the unconnected position of the outer shaft 6O and the idler gear 6r ,

The selection mechanism has a moving means (not shown). The moving means moves any one of the moving parts 71 . 72 . 734 . 756 and 7r to the connected position and the remainder thereof to the disconnected position according to a manual operation of the operating member (not shown) by the driver or according to an electromagnetic operation of an actuator (not shown). The moving device can handle all the moving parts 71 . 72 . 734 . 756 and 7r move to the unconnected position. The moving means may, for example, have a shift-and-select shaft or a shift fork.

The stepped variable transmission 100 , which has the structure described above, is a manual transmission (MT) in which the gear stages 51 to 56 and 5r be switched by an operation of a driver, or an automated manual transmission (AMT), in which the gear ratios 51 to 56 and 5r be switched by an operation of an actuator, by the control device 8th is controlled. The stepped variable transmission 100 is not limited to the examples disclosed herein. For example, specifications (including layout, number, position, layout, size, number of gears, number of teeth, and the like) of the input shafts, output shafts, gear stages, drive gears, output gears, selector mechanism, and the like be changed differently from other components. The first shaft may be a countershaft. The stepped variable transmission 100 can be a double-clutch transmission (DCT) with two input shafts.

The switching unit 200 has a first inner shaft 6M , a machine linkage gear 6e , the outer shaft 6O , an input connection gear 6i , the output connection gear 6o and the idler gear 6r ,

The first inner wave 6M is parallel to the input shaft 11 , the first output shaft 21 and the second output shaft 22 spaced. The first inner wave 6M is rotatable about a center of rotation Ax61. The rotation center Ax61 is spaced in parallel from the rotational axes Ax11, Ax21 and Ax22.

The first inner wave 6M is with a wave 6m the motor generator MG connected and rotates integrally with, that is locked with, the shaft 6m , The wave 6m and the first inner wave 6M need not be directly connected to each other, and another rotation transmitting member such as a gear, a coupling or a belt may be disposed therebetween. A speed of the shaft 6m is not necessarily equal to a rotational speed of the first inner shaft 6M ,

The machine connection gear 6e is coaxial with the first inner shaft 6M that is, it is rotatable about the rotation center Ax61 on the radially outer side of the first inner shaft 6M rotatable. The first inner wave 6M is an example of the first rotary element.

The machine connection gear 6e turns locked with the shaft 1e the machine EC. In particular, the power transmission device has 1 a second inner shaft 12 passing through the clutch C and the input shaft 11 passes. The input shaft 11 has a cylindrical shape, and the second inner shaft 12 is in the input shaft 11 rotatably supported by a bearing. The second inner shaft 12 is coaxial with the input shaft 11 rotatable, that is, it is rotatable about the rotational center Ax11. A machine lock gear 12e is on the second inner shaft 12 fixed. A idler gear 4e is rotatable about the second output shaft 22 and coaxial therewith, that is rotatable about the rotational center Ax22. The machine connection gear 6e turns locked with the shaft 1e the machine EG via the idler gear 4e , the engine lock gear 12e and the second inner shaft 12 , The machine connection gear 6e is an example of the second rotary element.

The outer wave 6O is at the radial outside of the first inner shaft 6M and coaxial with the first inner shaft 6M rotatable, that is, it is rotatable about the rotational center Ax61. The outer wave 6O rotates locked with the first output shaft 21 , Specifically, the output connection gear is 6o on the outer shaft 6O fixed, and the output gear 4r that with the output connection gear 6o engages, is at the first output shaft 21 fixed. The outer wave 6O is an example of the third rotary element.

The idler gear 6r acting as a rotation transmission path of the speed step 5r serves, is around the outer shaft 6O and coaxial with the first inner shaft 6M rotatable, that is rotatable about the center of rotation Ax61.

The input connection gear 6i rotates locked with the input shaft 11 , In particular, the input link gear engages 6i with the output gear 42 at the second output shaft 22 is rotatably supported. The output gear 42 engages with the drive gear 32 one that is on the input shaft 11 is fixed and integral with the input shaft 11 rotates. Therefore, the input connection gear rotates 6i locked with the input shaft 11 over the output gear 42 and the drive gear 32 , The input connection gear 6i is an example of the fourth rotary element.

The switching unit 200 has moving parts 2E . 2OI , The moving parts 2E and 2OI turn integrally with the first inner shaft 6M , The moving part 2E . 2OI is between two positions along the axial direction of the first inner shaft 6M movable. The two positions include a connected position (engaged position) in which the movable part 2E . 2OI with a fixed part to the coupling target (the machine link gear 6e , the outer shaft 6O or the input connection gear 6i ) and an unconnected position (separate position, neutral position) in which the moving parts engage 2E and 2OI are separated from the fixed part. The positions of the moving parts 2E and 2OI be through the actuator 81 changed by the control device 8th is controlled (see 1 ). The moving parts 2E and 2OI and the fixed part can for example form a dog clutch. In this case, everyone has the moving parts 2E and 2OI For example, a sleeve, and each of the fixed parts, for example, dog teeth, which engage with the sleeve. The dog clutch may have a synchronization device.

The moving part 2E and the fixed part of the machine connecting gear 6e be between the rotational transmission state, in which a rotation between the first inner shaft 6M and the machine linkage gear 6e is transferred, and switched to the rotation interruption state in which no rotation between the first inner shaft 6M and the machine linkage gear 6e is transmitted. The machine connection gear 6e is with the wave 1e the machine EC locked. That is the moving part 2E and the fixed part of the machine connecting gear 6e be between the rotation transmission state in which a rotation between the shaft 6m the motor generator MG and the shaft 1e is transferred to the engine EG and the rotation interruption state is switched, in which no rotation between the shaft 6m and the wave 1e is transmitted. Thus, the moving part 2E and the fixed part of the machine connecting gear 6e an example of the first switching mechanism 210 ,

The moving part 2OI and the solid part of the outer shaft 6O at which the output connection gear 6o is fixed between the rotational transmission state, in which a rotation between the first inner shaft 6M and the outer shaft 6O is transferred, and switched to the rotation interruption state in which no rotation between the first inner shaft 6M and the outer shaft 6O is transmitted. As described above, the outer shaft is 6O with the first output shaft 21 locked. That is the moving part 2OI and the solid part of the outer shaft 6O be between the rotation transmission state in which a rotation between the shaft 6m the motor generator MG and the first output shaft 21 is transferred, and switched to the rotation interruption state in which no rotation between the shaft 6m and the first output shaft 21 is transmitted. Thus, the moving part 2OI and the solid part of the outer shaft 6O an example of the second switching mechanism 220 ,

The moving part 2OI and the fixed part of the input connection gear 6i be between the rotational transmission state, in which a rotation between the first inner shaft 6M and the input connection gear 6i is transferred and the first rotation interrupted state in which no rotation between the first inner shaft 6M and the input connection gear 6i is transmitted. The input connection gear 6i engages with the output gear 42 one and is with the drive gear 32 and the input shaft 11 locked. That is the moving part 2OI and the fixed part of the input connection gear 6i be between the rotation transmission state in which a rotation between the shaft 6m the motor generator MG and the input shaft 11 is transferred, and switched to the rotation interruption state in which no rotation between the shaft 6m and the input shaft 11 is transmitted. Thus, the moving part 2OI and the fixed part of the input connection gear 6i an example of the third switching mechanism 230 ,

In the embodiment, the outer shaft works 6O acting as a rotation transmission path between the motor generator MG and the first output shaft 21 serves as a follower in the reverse gear stage 5r ,

Furthermore, in the embodiment, the driven gear works 42 the gear stage 52 as a follower in the rotation transmission path between the motor generator MG and the input shaft 11 ,

The switching unit 200 is not limited to the example disclosed herein and can be realized in various configurations. For example, the second switching mechanism 220 between the rotation transmitting state and the rotation interrupting state of wave 6m the motor generator MG and the second output shaft 22 be switched. The switching unit 200 can have two second switching mechanisms 220 in parallel, one for switching between the rotation transmitting state and a rotational interrupting state of the shaft 6m the motor generator MG and the first output shaft 21 and the other for switching between the rotation transmission state and the rotation-discontinuation state of the shaft 6m the motor generator MG and the second output shaft 22 , The switching unit 200 may have parallel third rotary elements locked to one of the first output shaft 21 and the second output shaft 22 rotate at different gear ratios (speed ratio). The third rotary elements can be connected to the first output shaft 21 or the second output shaft 22 be locked. In this case, the switching unit 200 third rotary elements have that with the first output shaft 21 may be locked, may have third rotary elements, which are connected to the second output shaft 22 are locked, or may be the third rotary element, with the first output shaft 21 is locked, and have the third rotary element, with the second output shaft 22 is locked. The combinations in the first switching mechanism 210 , the second switching mechanism 220 and the third switching mechanism 230 That is, the manner of dividing the moving parts may be variously changed or they may be independent of each other. Specifications (including a design, the number, a position, an arrangement, a size, the number of gears, the number of teeth and the like) of the switching unit 200 can be changed variously.

The control device 8th is, for example, an electronic control unit (ECU). The control device 8th has, for example, a central processing unit (CPU). The CPU executes arithmetic processing according to a computer program installed in, for example, a main memory, the first switching mechanism 210 , the second switching mechanism 220 , the third switching mechanism 230 to control the clutch C and other elements. The control device 8th may include hardware such as a field programmable gate array (FPGA) and an application specific integrated circuit (ASIC), and may control the elements using such hardware.

The following describes various drive modes provided by the power transmission device 1 are realized. The following exemplifies the operation in which the control device 8th between the rotation transmitting state and the rotation interrupting state of the first switching mechanism 210 , the second switching mechanism 220 , the third switching mechanism 230 and the clutch C switches.

1: engine start mode, idle stop mode

In this mode, the control device puts 8th the first switching mechanism 210 in the rotation transmitting state, offset the second switching mechanism 220 in the rotation interruption state, offset the third switching mechanism 230 in the rotational interruption state, and puts the clutch C in the rotation interruption state. This control is for placing the vehicle in a standby state for immediately starting the engine EG by the motor generator MG. During a so-called neutral state of the stepped variable speed transmission 100 With no gear ratio selected, the clutch C can be placed in the rotational transmission state. However, in the rotation-stopped state of the clutch C, a rotational load, that is, an energy consumption of the motor generator MG, may be reduced from that in the rotation transmitting state.

2: Charging mode during vehicle stop

In this mode, the control device puts 8th the first switching mechanism 210 in the rotation transmitting state, offset the second switching mechanism 220 in the rotation interruption state, offset the third switching mechanism 230 in the rotational interruption state, and puts the clutch C in the rotation interruption state. In this control, the motor generator MG can be rotated by the engine EG to generate electric power to charge the battery (not shown). In the neutral state of the stepped variable speed transmission 100 For example, the clutch C can be placed in the rotation transmitting state. However, in the rotation-stopped state of the clutch, a rotational load, that is, an energy consumption of the engine EG, can be reduced from that in the rotation transmitting state.

3-1: First EV travel mode

In this mode, the control device puts 8th the first switching mechanism 210 in the turn-off state, offset the second switching mechanism 220 in the rotation transmitting state, offset the third switching mechanism 230 in the rotational interruption state, and puts the clutch C in the rotation interruption state. With this control, the motor generator MG can rotate the wheels W and the vehicle can travel as an electric vehicle (EV).

3-2: Second EV travel mode

In this mode, the control device puts 8th the first switching mechanism 210 in the turn-off state, offset the second switching mechanism 220 in the rotation interruption state, offset the third switching mechanism 230 in the rotation transmission state and puts the clutch C in the rotation interruption state. In this control, a moment of the motor generator MG becomes the wheels W via the stepped variable speed transmission 100 transfer. Thus, the vehicle can be driven more efficiently.

4-1: First engine start mode during EV travel

In this mode, the control device puts 8th the first switching mechanism 210 in the turn-off state, offset the second switching mechanism 220 in the rotation transmitting state, offset the third switching mechanism 230 in the turn-off state, and switches the clutch C from the rotation-stopped state to the rotation-transmitting state. In this control, a torque generated by the motor generator MG can be transmitted to the wheels W and the engine EG to start the engine EG while the vehicle is running.

4-2: Second engine start mode during EV travel

In this mode, the control device puts 8th the first switching mechanism 210 in the turn-off state, offset the second switching mechanism 220 in the rotation interruption state, offset the third switching mechanism 230 in the rotation transmission state, and switches the clutch C from the rotation interruption state to the rotation transmission state. In this control, a torque generated by the motor generator MG can be transmitted to the wheels W and the engine EG to start the engine EG while the vehicle is running. By torque transmission via the stepped variable transmission 100 a part of the torque of the motor generator MG is delayed by the gear stage and transmitted to the wheels W. Thus, driving the vehicle and starting the engine EG under a more suitable condition can be made compatible with each other.

5: Machine driving mode

In this mode, the control device puts 8th the first switching mechanism 210 in the turn-off state, offset the second switching mechanism 220 in the rotation interruption state, offset the third switching mechanism 230 in the rotation-stopped state, and puts the clutch C in the rotation transmitting state. With this control, the engine EG can control the wheels W via the stepped variable transmission 100 turn and the vehicle can drive through the machine EG. In this case, due to the fact that the first switching mechanism 210 and the second switching mechanism 220 in the rotation-stopped state, an increase in energy loss due to the motor generator MG or the switching unit 200 prevented.

6-1: First hybrid drive mode

In this mode, the control device puts 8th the first switching mechanism 210 in the turn-off state, offset the second switching mechanism 220 in the rotation transmitting state, offset the third switching mechanism 230 in the rotation-stopped state, and puts the clutch C in the rotation transmitting state. With this control, for example, when a relatively large vehicle acceleration is required, the wheels W can be rotated by both the engine EG and the motor generator MG.

6-2: Second hybrid driving mode

In this mode, the control device puts 8th the first switching mechanism 210 in the turn-off state, offset the second switching mechanism 220 in the rotation interruption state, offset the third switching mechanism 230 in the rotation transmitting state and puts the clutch C in the rotational transmission state. With this control, a moment of the motor generator MG becomes the wheels W via the stepped variable transmission 100 transfer. Thus, the vehicle can be driven more efficiently.

7-1: First loading mode

In this mode, the control device puts 8th the first switching mechanism 210 in the turn-off state, offset the second switching mechanism 220 in the rotation transmitting state, offset the third switching mechanism 230 in the rotation-stopped state, and puts the clutch C in the rotation transmitting state. With this control, for example, during vehicle driving at a constant speed or at a relatively low acceleration, the wheels W at the moment of the engine EG via the stepped variable transmission 100 be turned, and the Motor generator MG can be rotated to generate electrical power and to charge the battery.

7-2: Second loading mode

In this mode, the control device puts 8th the first switching mechanism 210 in the turn-off state, offset the second switching mechanism 220 in the rotation interruption state, offset the third switching mechanism 230 in the rotation transmitting state and puts the clutch C in the rotational transmission state. With this control, a moment of the engine EG becomes the motor generator MG without the stepped variable transmission 100 transfer. Thus, the battery can be charged more efficiently.

8-1: First regenerative mode

In this mode, the control device puts 8th the first switching mechanism 210 in the turn-off state, offset the second switching mechanism 220 in the rotation transmitting state, offset the third switching mechanism 230 in the rotational interruption state, and puts the clutch C in the rotation interruption state. With this control, for example, during a deceleration of the vehicle, the motor generator MG can be rotated with a moment of the wheels W to generate electric power and to charge the battery. A kinetic energy is thus converted into electrical energy, which delays the vehicle.

8-2: Second regenerative mode

In this mode, the control device puts 8th the first switching mechanism 210 in the turn-off state, offset the second switching mechanism 220 in the rotation interruption state, offset the third switching mechanism 230 in the rotation transmission state and puts the clutch C in the rotation interruption state. With this control, for example, during a deceleration of the vehicle, a moment of the wheels W to the motor generator MG via the stepped variable transmission 100 transfer. A kinetic energy can thus be more efficiently converted into electrical energy.

Control of the power transmission device 1 during vehicle stop

The following describes an example of the control of the power transmission device 1 by the control device 8th during a stop of the vehicle. 3 is an exemplary and schematic block diagram illustrating the control device 8th a power transmission system in the embodiment represents and 4 FIG. 10 is an exemplary flowchart illustrating an example of a control flow in the power transmission system of the embodiment. FIG. This means 3 is a block diagram of a controller 82 used in the control device 8th is included, and 4 FIG. 10 is a flowchart illustrating an example of the control algorithm by the controller. FIG 82 represents.

As in 3 is shown, the controller has 82 used in the control device 8th is included, a data acquisition device 82a , a switching control device 82b and an output device 82c , When the controller 82 Under instructions of a program, the program has a module corresponding to each unit (function) in the controller 82 ,

In a control determines the data acquisition device 82a Data for the control of, for example, sensors installed on the vehicle, another ECU, and the like. Data to be detected is, for example, data indicative of the selected gear ratio, data indicative of required acceleration (an amount of operation of an accelerator pedal), data indicating the rotational speed of the engine EG, data indicative of the rotational speed of the motor generator MG, data indicating the engine speed indicate the rotational speed of the vehicle, and data indicating a state of charge of the battery (vehicle battery) installed on the vehicle (for example, a state of charge (SOC)).

The output device 82c gives a control signal to the actuator 81 off and controls the actuator 81 to the rotation transmission state and the rotation stop state of the first switching mechanism 210 , the second switching mechanism 220 and the third switching mechanism 230 switch. The output device 82c Also outputs a control signal to the actuator (not shown) for the clutch C, and controls the actuator to switch the rotation transmission state, the rotation stop state and a friction transmission state (slip state, the half-clutch state) of the clutch C. The output device 82c may also be a control signal to the actuator (not shown) for the gear stage selection mechanism of the stepped variable transmission 100 output and controls the actuator to the gear stages of the stepped variable transmission 100 switch.

The output device 82c can to another ECU the calculation result, the Determination result, control signals or command values to devices other than the power transmission device 1 , as the engine EG and the motor generator MG, output.

The switching control device 82b performs arithmetic processing according to the control algorithm described in 4 is shown. The switching control device 82b has a first switching control device 82b1 , a second switching control device 82B2 , a third switching control device 82b3 and a fourth switching control device 82b4 ,

First, the switching control means compares 82b the SOC with a first threshold Th1 while the vehicle and the engine are stopped (S10). The first threshold Th1 is for example 30%. If the SOC is greater than the first threshold Th1, that is, if S10 is YES, the controller controls 82 Each unit to start the vehicle by the motor generator MG. On the other hand, if the SOC is equal to or lower than the first threshold Th1, that is, if S10 is NO, the controller controls 82 each unit to not start the vehicle by the motor generator MG. With the determination in S10, it is possible to determine NO at S10, for example, to determine that the charge amount (the amount of stored power) of the vehicle battery for starting the vehicle by the motor generator MG is insufficient, or to determine that Charge amount of the vehicle battery after starting the vehicle by the motor generator MG is too low. This provision can therefore prevent an excessive reduction in the amount of charge of the vehicle battery. The determination in S10 may be YES under other conditions where it is necessary to start the engine EG. As a result, for example, when power from the battery is lowered due to low temperatures, the power of the motor generator MG is reduced and therefore it is necessary to start the engine EG. The algorithm described herein may be applied to such a case.

If S10 is NO, the switching control means functions 82b as the fourth switching control means 82b4 , performs a control such that the first switching mechanism 210 enters the rotation transmission state (CL), and performs control such that the second switching mechanism 220 and the third switching mechanism 230 obtain the rotation interruption state (S20). In this case, the motor generator MG uses the situation that the first switching mechanism 210 is in the rotation transmitting state, and starts the engine EG. That is, the motor generator MG functions as a starter motor (S21).

If S10 is YES, the controller executes 82 a control that varies depending on the selected gear. For example, if the gear selected by the driver is the first gear (1st) or the reverse gear (Rev) (YES in S11), the switching control device operates 82b as the first switching control means 82b1 , performs a control such that the first switching mechanism 210 and the third switching mechanism 230 reach the rotation transmission state (CL), and performs control such that the second switching mechanism 220 reaches the rotation interruption state (OP) (S12). For example, the first switching mechanism 210 , the second switching mechanism 220 and the third switching mechanism 230 or are controlled so as to be in the turn-off state before the vehicle starts. In such a case, the switching control means stops in S12 82b the second switching mechanism 220 in the rotation interrupting state, control is performed such that the third switching mechanism 230 is switched from the rotation interruption state in the rotation transmission state, and performs a control such that the first switching mechanism 210 from the rotation-stopped state to the rotation-transmitting state simultaneously with or before switching of the third switching mechanism 230 is switched. As described above, the first switching mechanism 210 depending on whether the shaft 6m the motor generator MG and the shaft 1e the engine EG are locked together, the second switching mechanism 220 is switched depending on whether the shaft 6m the motor generator MG and the first output shaft 21 locked together, and the third switching mechanism 230 is switched depending on whether the shaft 6m the motor generator MG and the input shaft 11 are locked together. That is, in S12, the preparation for starting the engine EG by the motor generator MG and the preparation for starting by the motor generator MG are simultaneously performed. The first speed and the reverse speed are an example of the first predetermined speed.

If the required acceleration is 0 (NO in S13), the control flow is ended. On the other hand, if S13 is YES, and if the required acceleration is smaller than a second threshold Th2 (YES in S14), the switching control means functions 82b as the second switching control means 82B2 , performs a control such that the third switching mechanism 230 attains the rotation transmitting state (CL), and performs control such that the first switching mechanism 210 and the second switching mechanism 220 obtain the rotation interruption state (OP) (S15). That is, the switching control means 82b switches the first switching mechanism 210 from the rotation transmitting state to the rotation interrupted state, holds the third switching mechanism 230 in the rotation transmitting state and holds the second switching mechanism 220 in the turn-off state. That is the connection between the shaft 6m the motor generator MG and the input shaft 11 through the third switching mechanism 230 is held, and the connection between the shaft 6m the motor generator MG and the shaft 1e the engine EG by the first switching mechanism 210 will be interrupted. In this case, the engine EG is not started, and the vehicle starts and drives by the moment of the motor generator MG.

If the required acceleration is equal to or greater than the second threshold Th2 (NO in S14), the motor generator MG uses the rotation transmitting state of the first switching mechanism 210 and starts the machine EG. That is, the motor generator MG functions as a starter motor (S16). In this case, since the third switching mechanism 230 also in the rotation transmitting state, the torque of the motor generator MG is also used to start the vehicle. After the engine EG has been started, the switching control means functions 82b as the second switching control means 82B2 , performs a control such that the third switching mechanism 230 attains the rotation transmitting state (CL), and performs control such that the first switching mechanism 210 and the second switching mechanism 220 obtain the rotation interruption state (OP) (S15). In this case, after the engine EG has been started, the motor generator MG is stopped and the vehicle travels through the moment of the engine EG.

In the vehicle associated with the power transmission device 1 of the embodiment, the maximum value of the required acceleration is not achieved with the motor generator MG alone, but with the engine EG alone. The switching control device 82b then controls the first switching mechanism 210 and the third switching mechanism 230 to allow startup with the motor generator MG when the required acceleration is less than the second threshold Th2, and to allow starting up with the engine EG when the required acceleration is equal to or greater than the second threshold Th2.

In this case, when switching the first switching mechanism 210 from the rotation interruption state to the rotation transmission state for starting the engine EG by the motor generator MG due to the determined required acceleration being equal to or greater than the second threshold Th2, starting of the engine EG is not possible until the state switching is completed, which causes a delay until driving or acceleration of the vehicle is possible. In this regard, according to the embodiment, the switching control means 82b a control such that the first switching mechanism 210 from the rotation-stopped state to the rotation-transmitting state simultaneously with switching or before switching of the third switching mechanism 230 is switched from the rotation interruption state to the rotation transmission state. Therefore, the embodiment enables driving or acceleration of the vehicle due to the starting of the engine EG by the motor generator MG in a faster manner.

In S30, if the gear stage selected by the driver is the second gear stage (2nd) (YES in S30), the switching control means functions 82b as the third switching control means 82b3 , performs a control such that the first switching mechanism 210 is switched from the rotation interruption state to the rotation transmission state (CL), and performs control such that the second switching mechanism 220 and the third switching mechanism 230 obtain the rotation interruption state (OP) (S31). The difference between S31 and when the first gear stage and the reverse gear stage are selected (S12) is that the third switching mechanism 230 is not switched from the rotation interruption state to the rotation transmission state. Since the gear stage at S31 is higher than that at S12, it is difficult to achieve the start of the engine EG by the torque of the motor generator MG and the running of the vehicle by the torque of the motor generator MG at the same time. Therefore, at S31, only for the start of the engine EG by the moment of the motor generator MG, the switching control means results 82b a control such that the first switching mechanism 210 alone attains the rotation transmitting state while the second switching mechanism 220 and the third switching mechanism 230 be kept in the rotation interrupted state. The second speed is an example of the second predetermined speed.

In S30, if the gear selected by the driver other than the first gear, the second speed stage and the reverse speed stage (NO in S30) holds the switching control means 82b the first switching mechanism 230 , the second switching mechanism 220 and the third switching mechanism 230 in the rotation interruption state (S32), and the process ends. The first predetermined gear stage, by which the determination in S11 is YES, is the gear stage that allows starting of the vehicle by the motor generator MG. The second predetermined gear stage, by which the determination in S30 is YES, is the gear stage that allows starting of the vehicle not by the motor generator MG but by the engine EG. The gear stage by which the determination in S30 is NO is the gear stage which does not allow the vehicle itself to be started by the engine EG. The setting of these gear stages may be changed in response to the specifications such as the moment of the motor generator MG, the moment of the engine EG, and the gear ratio of the gear ratios.

Control of the actuator 81 at the start of the engine EG by the motor generator MG

In S16 or S21, when the engine EG is started by the motor generator MG, if the first switching mechanism 210 is kept in the rotation transmitting state, even after the engine EG has been started, noise or vibration resulting from a rotation change of the engine EG may be transmitted to each unit in the vehicle via the first switching mechanism 210 be transmitted. Then, in the embodiment, the switching control means controls 82b the actuator 81 that the moving part 2E the first switching mechanism 210 operated, such that a force (bias) on the moving part 2E acts in the direction of detachment from the fixed part, so that the movable part 2E from the machine connecting gear 6e (fixed part) can be solved by the absorbed force due to the rotation change of the machine EC. This force is set to a size at which the moving part 2E is not moved in the axial direction from the connected position to the unconnected position, for example, to a size smaller than a static frictional force when the movable part 2E and the fixed part of the machine connecting gear 6e are in a normal rotation state, that is, in a state in which the rotation change is smaller than a predetermined threshold (threshold value of time derivative of the rotation speed). The output value of the actuator 81 and the command value from the switching control means 82b for applying the force can be determined on the basis of experiments carried out in advance. Such a control may propagate a noise resulting from the rotation change of the engine EG to each unit in the vehicle via the first switching mechanism 210 suppress.

Structure of the first switching mechanism 210

5 FIG. 10 is an exemplary and schematic diagram showing a partial configuration of an example of the first switching mechanism 210 the power transmission device 1 represents in the embodiment. This means 5 is an exemplary and schematic diagram of the movable part 2E and the machine linkage gear 6e (fixed part) in an example of the first switching mechanism 210 from the perspective of the radial outside. As in 5 is shown has a tooth 6e1 the fixed part of the machine link gear 6e a tooth surface 6a on a front side and a tooth surface 6b on a rear side in the direction of rotation. An inclined surface 6a1 is at the tip end part of the tooth surface 6a intended. The inclined surface 6a1 extends rearward in the direction of rotation towards the tip end. An area 6a2 attached to the base of the tooth surface 6a relative to the inclined surface 6a1 is, and the tooth surface 6b are normal surfaces. The angle α of the inclination rearward in the rotational direction relative to the axial direction of the inclined surface 6a1 from the viewpoint of the radial outside is greater than the angle of an inclination (≈ 0) of the surface 6a2 which serves as a normal area, and the angle α is larger than the angle of inclination (≈ 0) forward in the rotational direction relative to the axial direction of the tooth surface 6b from the perspective of the radial outside. The inclined surface 6a1 is an example of the front inclined surface.

With such a configuration, when the engine EG starts and the engine EG speed increases, when the engine EG starts by the motor generator MG, the inclined surface is affected 6a1 on the front side of the tooth 6e1 of the machine connecting gear 6e the tooth surface 2 B on the back side of a tooth 2e1 of the moving part 2E so that the moving part 2E moves in the direction in which the engagement is released (to the right in 5 ). Such a configuration therefore suppresses propagation of a sound resulting from the rotation change of the engine EG to each unit in the vehicle via the first switching mechanism 210 ,

6 is an exemplary and schematic diagram illustrating a part of another of 5 various example of the first switching mechanism 210 the power transmission device 1 represents in the embodiment. This means 6 is an exemplary and schematic diagram of the movable part 2E and the machine linkage gear 6e (solid Part) in another example of the first switching mechanism 210 from the perspective of the radial outside. The tooth 2e1 of the moving part 2E has a tooth surface 2a on the front side and the tooth surface 2 B at the rear in the direction of rotation. An inclined surface 2b1 is at the tip end part of the tooth surface 2 B intended. The inclined surface 2b1 extends forward in the direction of rotation towards the tip end. An area 2b2 attached to the base of the tooth surface 2 B relative to the inclined surface 2b1 is, and the front tooth surface 2a are normal surfaces. The angle α of an inclination rearward in the rotational direction relative to the axial direction of the inclined surface 2b1 from the viewpoint of the radial outside is greater than the angle of an inclination (≈ 0) of the surface 2b2 which serves as a normal area, and the angle α is larger than the angle of inclination (≈ 0) forward in the rotational direction relative to the axial direction of the tooth surface 2a from the perspective of the radial outside. The inclined surface 2b1 is an example of the rear inclined surface.

With such a configuration, when the engine EG starts by the motor generator MG, when the engine EG starts and the engine EG's speed increases, the tooth surface is touched 6a on the front side of the tooth 6e1 of the machine connecting gear 6e the inclined surface 2b1 at the back of the tooth 2e1 of the moving part 2E so that the moving part 2E moves in the direction in which the engagement is released (to the right in 6 ). Such a configuration therefore suppresses a propagation of a sound resulting from a rotation change of the engine EG to each unit in the vehicle via the first switching mechanism 210 , The first switching mechanism 210 may be at least one of the inclined surface 6a1 and the inclined surface 2b1 to have.

The switching control device 82b controls the actuator 81 to the moving part 2E to move to a position Pt, where the tooth, the inclined surface 6a1 or 2b1 engages with the tip end of the other tooth when starting the engine EG by the motor generator MG. On the other hand, the switching control means controls 82b the actuator 81 to the moving part 2E to move to a position Pc where the area 6a2 or 2b2 at the base side of the inclined surface 6a1 or 2b1 engages with the tip end of the other tooth when starting the motor generator MG by the engine EG. These controls suppress disengagement of the movable part 2e when the motor generator MG is rotated by the engine EG.

Exemplary control by switching control means 82b

7 FIG. 10 is an exemplary timing chart illustrating an example of operation of each unit of the power transmission system in the embodiment; FIG. 8th is an exemplary timing diagram which is another of 7 illustrates a different example of an operation of each unit of the power transmission system in the embodiment, and 9 is an exemplary timing diagram which is another of 7 and 8th illustrates a different example of an operation of each unit of the power transmission system in the embodiment. This means 7 to 9 are timing charts when the control by the switching control means 82b is performed. In these examples, the clutch C is controlled by the control device 8th controlled by the driver on the basis of the manual operation of the clutch pedal. In the figures, "Co" denotes the stroke of the clutch pedal based on the operation by the driver, and represents the operation of the clutch pedal from the upper side to the lower side in the figures. The actual control of the clutch C will be described later than the operation of the clutch Clutch pedals executed. The rotation transmitting state of the second switching mechanism 220 and the rotation transmitting state of the third switching mechanism 230 are, as in 2 is shown, alternatively. In the figures, "N" represents a neutral gear at the gear stage, "OUT" at the switching mechanism sets the rotation transmitting state of the second switching mechanism 220 (and the rotation transmitting state of the third switching mechanism 230 ), "IN" in the switching mechanism sets the rotation transmitting state of the third switching mechanism 230 (and the rotation-stopping state of the second switching mechanism 230 ), "OP" on the upper side in the switching mechanism sets the rotation-stopped state in the second switching mechanism 220 and the third switching mechanism 230 , "EG" in the switching mechanism sets the rotation transmitting state in the first switching mechanism 210 and "OP" at the lower side in the switching mechanism sets the rotation-stopped state in the first switching mechanism 210 represents.

7 is a timing diagram when in 4 S10 YES, S11 and S12 are YES, S13 is YES, S14 is NO, and S16 and S15 are executed. In this example, at a time t0, the clutch Co is operated by the driver, and the first speed is selected from a neutral speed N until a time t11. When it is detected at the time t11 that the speed step is the first speed step (YES in S11 in FIG 4 ), leads the switching control 82b a controller such that the third switching mechanism 230 obtained the rotation transmission state (IN). The switching control device 82b also performs a control such that the first switching mechanism 210 the rotation transmitting state (EG) simultaneously with obtaining the rotation transmitting state of the second switching mechanism 220 attained (S12 in 4 ). In this case, as indicated by the broken line, the switching control means 82b perform a control such that the first switching mechanism 210 the rotation transmitting state (EG) from a time t0, for example, in response to activation of the system in the vehicle based on the switch-on operation of the ignition switch or the switch-on operation of the circuit breaker. The switching control device 82b may perform a control such that the first switching mechanism 210 the rotation transmitting state (EG) obtained in advance before the switch-on operation of the ignition switch.

When the switching operation to the rotation transmitting state (IN) of the third switching mechanism 230 is completed at a time t12, the torque of the motor generator MG becomes the wheels W via the third switching mechanism 230 and the stepped variable transmission 100 transferred so that the vehicle starts.

When the operation of the acceleration operation means such as the accelerator pedal by the driver shows that the required acceleration is 100%, which is larger than the second threshold Th2 (YES in S13 in FIG 4 , NO in S14 in 4 ), and when the switching operation in the rotation transmitting state (EG) of the first switching mechanism 210 is finished, the engine EG is started by the motor generator MG (S16 in FIG 4 ). In 7 the start of the machine is performed from a time t12 to a time t13. When the start of the engine EG is finished, the switching control means switches 82b the first switching mechanism 210 from the rotation transmitting state (EG) to the rotation interrupting state (OP) by (S15 in FIG 4 ). From a time t14 to a time t15, the torque of the motor generator MG is decreased, and the torque of the engine EG is increased. After a time t15, the vehicle travels through the moment of the engine EG.

8th is a timing diagram when in 4 S10 YES, S11 and S12 are YES, S13 is YES, S14 is YES, and S15 is executed. In this example, at a time t0, the clutch Co is operated by the driver, and the first speed is selected from a neutral speed N until a time t21. When it is detected at a time t21 that the speed step is the first speed step (YES in S11 in FIG 4 ), the switching control device performs 82b a controller such that the third switching mechanism 230 obtained the rotation transmission state (IN). The switching control device 82b also performs a control such that the first switching mechanism 210 the rotation transmitting state (EG) simultaneously with the obtaining of the rotation transmitting state of the second switching mechanism 220 attained (S12 in 4 ). Also in this case, as indicated by the broken line, the switching control means 82b perform a control such that the first switching mechanism 210 the rotation transmitting state (EG) from a time t0, for example, in response to activation of the system in the vehicle based on the switch-on operation of the ignition switch or the switch-on operation of the circuit breaker. The switching control device 82b may perform a control such that the first switching mechanism 210 the rotation transmitting state (EG) obtained in advance before the switch-on operation of the ignition switch.

When the switching operation is in the rotation transmitting state (IN) of the third switching mechanism 230 is finished at a time t22, the torque of the motor generator MG becomes the wheels W via the third switching mechanism 230 and the stepped variable transmission 100 transferred so that the vehicle starts.

When the operation of the acceleration operation means such as the accelerator pedal by the driver shows that the required acceleration is 20%, which is smaller than the second threshold Th2 (YES in S13 in FIG 4 , YES in S14 in 4 ), switches the switching control means 82b the first switching mechanism 210 until a time t23 in the rotation interrupting state (OP) (S15 in FIG 4 ). In this case, although the first switching mechanism 210 is offset in advance in the rotation transmission state (EG) before a time t22 for preparing the start of the engine EG, the engine EG is not started because the required acceleration is low and the vehicle can start only by the moment of the motor generator MG. After the time t23, the vehicle passes through the torque of the motor generator MG.

9 FIG. 12 is a timing chart when S10 is YES, S11 is NO, S30 and S31 are YES, S13 is YES, S14 is NO, and S15 and S16 in FIG 4 be executed. In this example, at a time t0, the clutch Co is operated by the driver, and the second speed stage is selected from a neutral gear N until a time t31. If it is detected at the time t31 that the Gear stage is the second gear stage (NO in S11 and YES in S30 in FIG 4 ), the switching control device performs 82b a control such that the first switching mechanism 210 the rotation transmission state (EG) is obtained (S31 in FIG 4 ). Also in this case, as shown by the broken line, the switching control means 82b perform a control such that the first switching mechanism 210 the rotation transmitting state (EG) from a time t0, for example, in response to activation of the system in the vehicle such as the switch-on operation of the ignition switch or the switch-on operation of the circuit breaker. The switching control device 82b may perform a control such that the first switching mechanism 210 the rotation transmitting state (EG) obtained in advance before the switch-on operation of the ignition switch.

At a time t32, when the operation of the acceleration operation means such as the accelerator pedal by the driver shows that the required acceleration is 100%, which is larger than the second threshold Th2 (YES in S13 in FIG 4 , NO in S14 in 4 ), and the switching operation in the rotation transmitting state (EG) of the first switching mechanism 210 is completed, the engine EG is started by the motor generator MG (S16 in FIG 4 ). In 9 the start of the machine is performed from the time t32 to the time t33. When the start of the engine EG is completed, the switching control means switches 82b the first switching mechanism 210 from the rotation transmitting state (EG) to the rotation interrupting state (OP) by (S15 in FIG 4 ). From a time t34 to a time t35, the clutch C is switched to the rotation transmitting state via the frictional transmission state (half-clutch state). After the time t35, the vehicle travels through the moment of the engine EG. After the time t33, the switching control means switches 82b the second switching mechanism 220 or the third switching mechanism 230 (in the example in 9 the second switching mechanism 220 ) in the rotation transmission state (OUT). This control prepares to switch to the state of driving by the torque of the motor generator MG.

As explained above, in the embodiment, when the first gear stage or the reverse gear stage (first predetermined gear stage) is selected during the stop of the vehicle and during the stop of the engine EG, the second switching mechanism is obtained 220 the rotation-stopping state and the first switching mechanism 210 and the third switching mechanism 230 acquire the rotation transmission state. In particular, for example, the first switching mechanism 210 from the rotation-stopped state to the rotation-transmitting state simultaneously with switching or before switching of the third switching mechanism 230 from the rotation-stopped state to the rotation-transmitting state. This configuration allows the vehicle to be ready for start-up faster than a design in which the first shift mechanism 210 is switched from the rotation interruption state to the rotation transmission state after the third switching mechanism 230 has been switched from the rotation interrupted state to the rotation transmission state. Moreover, the vehicle can start more smoothly through both the moment of the engine EG and the motor generator MG.

In the embodiment, for example, when the required acceleration is smaller than the second threshold Th2, the second switching control means 82B2 the first switching mechanism 210 in the rotation interruption state after starting the control by the first switching control means 82b1 , This configuration allows, for example, the vehicle to shift to the mode in which the vehicle starts by the moment of the motor generator MG when the required acceleration is relatively small. Thus, for example, an efficient way of starting according to the required acceleration can be selected.

In the embodiment, for example, when the second gear stage (the second predetermined gear stage) is selected during the stop of the vehicle and during the stop of the engine EG, the third switching control means 82b3 a controller through to the second switching mechanism 220 and the third switching mechanism 230 in the rotation stop state and the first switching mechanism 210 to put in the rotation transmission state. For example, this control may reduce wasteful power consumption necessary for activation of the switching mechanisms, which is unnecessary if the torque of the motor generator MG is not used for starting the vehicle.

In the embodiment, for example, when the value indicates that the charge amount of the vehicle battery is greater than the first threshold Th1 (predetermined threshold), the switching control means 82b a control by the first switching control means 82b1 or the second switching control device 82B2 by. This control can prevent, for example, an excessive reduction in the charge amount of the vehicle battery.

In the embodiment, for example, when the value indicative of the charge amount of the vehicle battery is smaller than a predetermined threshold, the fourth switching control means holds 82b4 the second switching mechanism 220 and the third switching mechanism 230 in the rotation-stopping state, and performs control such that the first switching mechanism 210 is switched from the rotation interruption state to the rotation transmission state. For example, this control may reduce the wasteful power consumption required to activate the switching mechanisms, which is unnecessary if the torque of the motor generator MG is not used to start the vehicle.

In the embodiment, the control device controls 8th for example, the actuator 81 to move on to the moving part 2E to apply a force that is directed axially from the connected position to the unconnected position and that does not move the movable part 2E from the connected position to the unconnected position in a state where a rotation change of the engine EG is smaller than a predetermined threshold value. In this case, when a rotational change of the engine EG increases after starting, the movable part may 2E moved from the connected position to the unconnected position by the force (bias). Thus, the first switching mechanism attains 210 for example, the rotation-stopping state faster after starting the engine EG by the motor generator MG, thereby suppressing transmission of noise or vibration resulting from rotation change of the engine EG.

For example, in the power transmission system, the first switching mechanism has at least one of the inclined surface 6a1 (front inclined surface) and the inclined surface 2b1 (rear inclined surface). In this case, if the inclined surface 6a1 or 2b1 the tooth, that of the inclined surface 6a1 or 2b1 is facing, due to an increase in the rotational change of the engine EG touched after starting, the movable part 2E to move from the connected position with the fixed part to the unconnected position. Thus, for example, obtains the first switching mechanism 210 the rotation-stopping state faster after the start of the engine EG by the motor generator MG, thereby suppressing a transmission of a noise or a vibration resulting from a rotation change of the engine EG.

While the embodiments of the present invention have been described, these embodiments have been presented by way of example only, and it is not intended to limit the scope of the invention. Instead, the embodiments may be implemented in a variety of other forms; Furthermore, various omissions, substitutions, combinations, and changes may be made without departing from the gist of the invention. The designs and the shapes in the examples may be partially replaced for realization. Specifications such as the shapes and the shapes (including a structure, a type, a direction, a size, a shape, a length, a width, a height, the number, an arrangement and a position) may be changed for realization when it suitable is. For example, the switching units and the control unit are not limited to those that set each of the switching mechanisms in the rotation transmitting state. Alternatively, they may place one or more of the switching mechanisms in the rotational transmission state.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2010-2083676 [0002]

Claims (9)

A power transmission system for a vehicle, the power transmission system comprising: a power transmission device; and a control device configured to control the power transmission device, wherein the power transmission device comprises: a stepped variable transmission comprising: a first shaft; a second shaft parallel to the first shaft; a plurality of gear stages, each having a drive gear and an output gear and having different gear ratios from each other, wherein the drive gear is rotated by the first shaft and the output gear with the drive gear directly or via a follower engages to rotate the second shaft; and a selection mechanism that selects one of the gear ratios, wherein the stepped variable transmission transmits rotation of the first shaft to the second shaft via the gear stage selected by the selection mechanism; a first rotary member that rotates locked with a shaft of a motor generator; a second rotary member rotatably locked to a shaft of a machine; a third rotary member that rotates locked with the second shaft; a fourth rotary member that rotates locked with the first shaft; a first switching mechanism that is switched between a first rotation transmitting state and a first rotation stopping state, wherein the first rotation transmitting state is a state in which rotation is transmitted between the first rotating element and the second rotating element, wherein the first turning-off state is a state in which none Rotation is transmitted between the first rotary member and the second rotary member; a second switching mechanism that is switched between a second rotation transmitting state and a second turning-off state, wherein the second rotation transmitting state is a state in which rotation between the first rotating element and the third rotating element is transmitted, and the second turning-off state is a state in which none Rotation is transmitted between the first rotary member and the third rotary member; and a third switching mechanism that is switched between a third rotation transmitting state and a third rotation stopping state, wherein the third rotation transmitting state is a state in which rotation between the first rotating element and the fourth rotating element is transmitted, and the third rotation stopping state is a state in which no Rotation is transmitted between the first rotary member and the fourth rotary member, and the control device includes first switching control means configured to set the second switching mechanism in the second rotation-stopping state, setting the first switching mechanism in the first rotation transmitting state, and setting the third switching mechanism in the third rotation transmitting state when a first predetermined speed step is selected; while the vehicle and the machine are stopped. The power transmission system according to claim 1, wherein the control device comprises a second switching control means configured to set the first switching mechanism in the first rotation interrupting state in a state where the engine is not started after execution of a control by the first switching control device, if required Acceleration is less than a predetermined threshold and greater than 0. The power transmission system according to claim 2, wherein the second switching control means is further configured to set the first switching mechanism in the first rotation-stopping state in a state where the engine is started after an end of the control by the first switching control means, when the required acceleration is the same or greater than the predetermined threshold. The power transmission system according to any one of claims 1 to 3, wherein the control device comprises third switching control means configured to set the second switching mechanism in the second rotation-stopping state, setting the third switching mechanism in the third rotation-stopping state, and the first switching mechanism in the first rotation transmitting state shift when a second predetermined gear is selected while the vehicle and the engine are stopped. The power transmission system according to claim 4, wherein the control device is configured to set the second switching mechanism in the second rotation transmitting state or to set the third switching mechanism in the third rotation transmitting state and to set the first switching mechanism in the first rotation interrupted state, in a state in which the engine is started after an end of a control of the third switching control device when a required acceleration is equal to or greater than a predetermined threshold. The power transmission system according to any one of claims 1 to 5, wherein the control device is configured to execute control by the first switching control device when a value indicative of the charge amount of a vehicle battery is larger than a predetermined threshold. A power transmission system according to any one of claims 1 to 6, wherein the first switching mechanism has a fixed part and a movable part, the movable part being moved in an axial direction between a connected position and a non-connected position, the connected position being a position in which the movable part engages with the fixed part, and the unconnected position is a position in which the movable part is separated from the fixed part, one of the fixed part and the movable part is disposed on one side of the engine, and the other of the fixed part and the movable part is disposed on one side of the motor generator, and the control device is configured to control an actuator to apply a force to the moving part when the motor generator starts the engine, the force being directed axially from the connected position to the unconnected position and not moving the movable part of the moving part connected position to the disconnected position in a state in which a rotation change of the machine is smaller than a predetermined threshold value. A power transmission system according to any one of claims 1 to 7, wherein the first switching mechanism has a fixed part and a movable part, the movable part moving in an axial direction between a connected position and a non-connected position, the connected position being a position in which the movable part engages with the fixed part, and the unconnected position is a position in which the movable part is separated from the fixed part, one of the fixed part and the movable part is disposed on one side of the engine and the other of the fixed part and the movable part is disposed on one side of the motor generator, and the first switching mechanism has at least one of a front inclined surface and a rear inclined surface, the front inclined surface being disposed on a front surface in a first rotational direction of one of the fixed portion and the movable portion and rearward in the first rotational direction extends to a tip end, and wherein the rear inclined surface is disposed on a rear surface in a second rotational direction of the other of the fixed part and the movable part and extends forward in the second rotational direction toward a tip end. A control device included in the power transmission system according to any one of claims 1 to 8.

Images