JP6532280B2 - Control device - Google Patents

Description

  The present invention relates to a control device for an automatic transmission.

  The automatic transmission generally includes a planetary gear mechanism and an engagement mechanism such as a clutch and a brake, and implements each gear by switching the power transmission path by the engagement mechanism. As the engagement mechanism, in addition to the hydraulic engagement mechanism, adoption of a mechanical engagement mechanism is also proposed, and in particular, a clutch (two-way clutch) that can be switched to a state in which bidirectional rotation regulation is performed is used as a brake. A configuration that has been proposed is also proposed (e.g., Patent Document 1).

JP, 2014-173649, A

  The mechanical engagement mechanism is configured to perform mechanical drive transmission. For this reason, there are cases where the switching of the state can not be smoothly performed depending on the action state of the load on the engaging portion inside the mechanism. The operating state of the load often depends on the traveling state of the vehicle. Therefore, switching of the mechanical engagement mechanism may be performed on the condition of the traveling state, but the switching timing is restricted.

  An object of the present invention is to improve the switching freedom of a mechanical engagement mechanism.

According to the invention
A control device for an automatic transmission,
The automatic transmission
An input shaft to which driving force is input from a driving source via a torque converter;
An output member,
A plurality of planetary gear mechanisms for transmitting the driving force input to the input shaft to the output member;
And a plurality of engagement mechanisms capable of establishing a plurality of shift speeds by switching transmission paths of driving forces in the plurality of planetary gear mechanisms,
One of the plurality of engagement mechanisms is a mechanical engagement mechanism that functions as a brake,
The mechanical engagement mechanism is
A first state in which only rotation of a predetermined one of a plurality of rotating elements included in the plurality of planetary gear mechanisms is restricted; a first state of the predetermined rotating element; and the first state Switchable to a second state in which rotation in a second direction opposite to the second direction is restricted.
The plurality of shift speeds are
A lowest forward speed at which the mechanical engagement mechanism can be established in any of the first state and the second state;
A forward gear that has a gear ratio higher than the lowest forward speed, and the mechanical engagement mechanism can not be established in the second state;
Reverse gearing, wherein said mechanical engagement mechanism establishes in said second state;
The plurality of engagement mechanisms include a predetermined engagement mechanism,
The predetermined engagement mechanism does not require the engagement to establish the lowest forward speed , and the shift stage is the lowest forward speed in terms of the structure of the automatic transmission, and the mechanical clutch An engagement mechanism capable of bearing a load acting on the predetermined rotating element in the second direction by the engagement when the engagement mechanism is in the second state;
The controller is
Engagement control means capable of engaging the predetermined engagement mechanism when the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the second state;
When the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the second state, the mechanical engagement mechanism is engaged when the predetermined engagement mechanism is engaged. Switching control means capable of switching the state to the first state;
A control device is provided, characterized in that:

Moreover, according to the present invention,
A control device for an automatic transmission,
The automatic transmission
An input shaft to which driving force is input from a driving source via a torque converter;
An output member,
A plurality of planetary gear mechanisms for transmitting the driving force input to the input shaft to the output member;
And a plurality of engagement mechanisms capable of establishing a plurality of shift speeds by switching transmission paths of driving forces in the plurality of planetary gear mechanisms,
One of the plurality of engagement mechanisms is a mechanical engagement mechanism that functions as a brake,
The mechanical engagement mechanism is
A first state in which only rotation of a predetermined one of a plurality of rotating elements included in the plurality of planetary gear mechanisms is restricted; a first state of the predetermined rotating element; and the first state Switchable to a second state in which rotation in a second direction opposite to the second direction is restricted.
The plurality of shift speeds are
A lowest forward speed at which the mechanical engagement mechanism can be established in any of the first state and the second state;
A forward gear that has a gear ratio higher than the lowest forward speed, and the mechanical engagement mechanism can not be established in the second state;
Reverse gearing, wherein said mechanical engagement mechanism establishes in said second state;
The plurality of engagement mechanisms include a predetermined engagement mechanism,
In the structure of the automatic transmission, the predetermined engagement mechanism is engaged by the engagement when the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the first state. It is an engagement mechanism capable of bearing a load acting on the predetermined rotating element in the second direction,
The controller is
First detection means for detecting the number of revolutions input from the drive source to the torque converter;
Second detection means for detecting the number of rotations of the input shaft;
A determination unit that determines whether the number of rotations detected by the second detection unit is smaller than the number of rotations detected by the first detection unit;
Engagement control means capable of engaging the predetermined engagement mechanism when the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the second state;
Switching control means capable of switching the mechanical engagement mechanism to the first state when the transmission gear position is the lowest forward speed and the mechanical engagement mechanism is in the second state; , Including
The engagement control means is
The predetermined engagement mechanism can be engaged on condition that the determination means is determined to be small.
A control device is provided, characterized in that:

  According to the present invention, it is possible to improve the switching freedom of the mechanical engagement mechanism.

FIG. 1 is a skeleton diagram of an automatic transmission according to an embodiment of the present invention. (A) is a figure which shows the example of the engagement table | surface of an engagement mechanism, (B) is a figure which shows the gear ratio of a planetary gear mechanism. FIG. 2 is a velocity diagram of the automatic transmission of FIG. 1; (A) is a block diagram which shows the example of the control apparatus of the automatic transmission of FIG. 1, (B) is a figure which shows the example of arrangement | positioning of a hydraulic pressure sensor. Outline | summary explanatory drawing of the process at the time of reverse range selection. 5 is a flowchart showing an example of processing of the control device of FIG. 4; Explanatory drawing of a mechanical engagement mechanism. (A) and (B) is explanatory drawing of a mechanical engagement mechanism. (A) and (B) is explanatory drawing of a mechanical engagement mechanism. 5 is a flowchart showing an example of processing of the control device of FIG. 4; 5 is a flowchart showing an example of processing of the control device of FIG. 4;

  FIG. 1 is a skeleton diagram of an automatic transmission 1 according to an embodiment of the present invention. Referring to FIG. 1, the automatic transmission 1 includes an input shaft 10 rotatably supported in a casing 12 constituting the transmission case, and a support member 12 a supported by the casing 12. And an output shaft (counter shaft) 13 rotatably supported coaxially.

  A driving force from an internal combustion engine EG (sometimes simply referred to as EG) is input to the input shaft 10, and the input shaft 10 is rotated by the driving force. A launch device is provided between the input shaft 10 and the internal combustion engine EG. Examples of the start-up device include clutch-type start-up devices (single-plate clutches, multi-plate clutches, etc.) and fluid-coupling-type start-up devices (torque converters etc.). In the present embodiment, a torque converter TC is provided. ing. Therefore, the driving force of the internal combustion engine EG is input to the input shaft 10 via the torque converter TC.

  The output member 11 comprises a gear concentric with the input shaft 10, and the output shaft 13 comprises a gear meshing with this gear. The rotation of the input shaft 10 is shifted by the transmission mechanism described below and transmitted to the output shaft 13. The rotation (driving force) of the output shaft 13 is transmitted to the drive wheels via, for example, a differential gear (not shown).

  The automatic transmission 1 includes planetary gear mechanisms P1 to P4 and engagement mechanisms C1 to C3, B1 to B3 and F1 as a transmission mechanism. In the case of this embodiment, the planetary gear mechanisms P1 to P4 are all single pinion type planetary gear mechanisms. Driving force is transmitted from the input shaft 10 to the output member 11 by the planetary gear mechanisms P1 to P4. The planetary gear mechanisms P1 to P4 can form a plurality of transmission paths of the driving force. Then, the transmission paths of the driving force in the planetary gear mechanisms P1 to P4 are switched by the engagement mechanisms C1 to C3, B1 to B3 and F1 to establish a plurality of shift speeds.

  The planetary gear mechanisms P1 to P4 include sun gears S1 to S4, ring gears R1 to R4, and carriers Cr1 to Cr4 supporting pinion gears as rotational elements (12 pieces in total), and are coaxially arranged with the input shaft 10 It is set up.

  When ordering is performed in the order corresponding to the gear ratios in the velocity diagram of FIG. 3 described later, when the sun gear S1 of the planetary gear mechanism P1, the carrier Cr1, and the ring gear R1 are arranged in this order, the first rotating element, the second , The third rotation element, and so on.

  Similarly, the ring gear R2, the carrier Cr2, and the sun gear S2 of the planetary gear mechanism P2 can be referred to as a fourth rotation element, a fifth rotation element, and a sixth rotation element in this order.

  Similarly, the sun gear S3, the carrier Cr3, and the ring gear R3 of the planetary gear mechanism P3 can be referred to as a seventh rotation element, an eighth rotation element, and a ninth rotation element in this order.

  Similarly, the ring gear R4, the carrier Cr4, and the sun gear S4 of the planetary gear mechanism P4 can be referred to as a tenth rotating element, an eleventh rotating element, and a twelfth rotating element in this order.

  The engagement mechanisms C1 to C3, B1 to B3 and F1 function as a clutch or a brake. The clutch performs on and off between the rotary elements of the automatic transmission 1. The brake performs on and off between the rotating element of the automatic transmission 1 and the casing 12. The rotating elements included in the automatic transmission 1 include the input shaft 10, the sun gear of the planetary gear mechanisms P1 to P4, a ring gear, and a carrier.

  In the case of the present embodiment, the engagement mechanisms C1 to C3 are clutches, and the engagement mechanisms B1 to B3 and F1 are brakes. Therefore, the engagement mechanisms C1 to C3 may be referred to as clutches C1 to C3, and the engagement mechanisms B1 to B3 and F1 may be referred to as brakes B1 to B3 and F1. By switching the engagement mechanisms C1 to C3 and B1 to B3 between the engaged state (fastened state) and the released state, and by switching the state of the engagement mechanism F1, the drive from the input shaft 10 to the output member 11 The power transmission path is switched to realize a plurality of shift speeds.

  In the case of this embodiment, the engagement mechanisms C1 to C3 and B1 to B3 all assume a hydraulic friction engagement mechanism. Examples of the hydraulic friction engagement mechanism include a dry or wet single disc clutch, and a dry or wet multiple disc clutch.

  The engagement mechanism F1 is provided between the predetermined rotation elements (here, the carriers Cr1 and Cr2 coupled to each other) and the casing 12. The engagement mechanism F1 restricts rotation of one of the predetermined rotation elements (carriers Cr1 and Cr2) only in one direction and allows rotation in the opposite direction (sometimes referred to as OWC). It can be switched to a rotation prevention state (sometimes called TWC) that restricts rotation.

  The one-way rotation permission state is a state having the same function as a so-called one-way clutch, and is a state in which drive is transmitted in one of the rotation directions and idle rotation is performed in the opposite direction. In the case of the present embodiment, since the engagement mechanism F1 functions as a brake, when the engagement mechanism F1 is in the one-direction rotation permission state, only one-direction rotation of the predetermined rotating elements (carriers Cr1 and Cr2) is permitted. It becomes. The rotation prevention state is a state in which drive is transmitted in both directions of rotation. In the case of this embodiment, since the engagement mechanism F1 functions as a brake, when the engagement mechanism F1 is in the rotation inhibition state, rotation of the predetermined rotation elements (carriers Cr1 and Cr2) is prevented in both directions.

  Although a structural example of the engagement mechanism F1 will be described later, for example, a known two-way clutch can be employed. Among known two-way clutches, there is one that can be switched to a one-way rotation permission state, a rotation inhibition state, and a two-way rotation permission state by drive control of the corresponding hydraulic actuator or electromagnetic actuator. In addition, as a known two-way clutch, there is a known two-way clutch in which the one-way rotation permission state can be switched to a forward rotation permission state and a reverse rotation permission state. In the present embodiment, it is sufficient to switch between the one-way rotation permission state and the rotation prevention state, and it is sufficient that the one-way rotation permission state can be used only at the one rotation direction allowable state. However, a two-way clutch may be employed which can select another state such as a bi-directional rotation allowable state.

  Next, the connection between the respective components will be described with reference to FIG.

  The sun gear S3 of the planetary gear mechanism P3 is connected to the input shaft 10. The ring gear R3 is coupled to the sun gear S2 of the planetary gear mechanism P2. The carrier Cr3 is connected to the ring gear R1 of the planetary gear mechanism P1 and the carrier Cr4 of the planetary gear mechanism P4. The carrier Cr2 of the planetary gear mechanism P2 is connected to the carrier Cr1 of the planetary gear mechanism P1. The ring gear R2 is connected to the output member 11. Therefore, the planetary gear mechanism P2 is a planetary gear mechanism that performs drive transmission to the output shaft 13.

  The clutch C1 connects the input shaft 10 with the carrier Cr1 of the planetary gear mechanism P1 and the carrier Cr2 connected thereto in the engaged state, and releases the connection in the released state. The released state may be referred to as the disengaged state. The clutch C2 connects the ring gear R3 of the planetary gear mechanism P3 and the sun gear S4 of the planetary gear mechanism P4 in the engaged state, and releases the connection in the released state. The clutch C3 connects the input shaft 10 and the ring gear R4 of the planetary gear mechanism P4 in the engaged state, and releases the connection in the released state.

  The brake B1 connects the casing 12 and the sun gear S1 of the planetary gear mechanism P1 in the engaged state, and releases the connection in the released state. The brake B2 connects the casing 12 and the sun gear S4 of the planetary gear mechanism P4 in the engaged state, and releases the connection in the released state. The brake B3 connects the casing 12 and the ring gear R4 of the planetary gear mechanism P4 in the engaged state, and releases the connection in the released state.

  As described above, the brake F1 restricts only one-way rotation of the carrier Cr2 of the planetary gear mechanism P2 (and the carrier Cr1 coupled thereto) in the one-way rotation allowance state, and prevents rotation in the rotation prevention state. The carrier Cr2 of the planetary gear mechanism P2 (and the carrier Cr1 connected thereto) is fixed to the casing 12.

  Next, FIG. 2 (A) is an engagement table (fastening table) showing an engagement combination of the engagement mechanisms included in the automatic transmission 1, and FIG. 2 (B) is a gear ratio of a planetary gear mechanism included in the automatic transmission 1. FIG. 3 is a velocity diagram of the automatic transmission 1. The “gear ratio” in FIG. 2A indicates the gear ratio between the input shaft 10 and the output member 11.

  In the case of this embodiment, it is possible to establish 10 forward gears (1st to 10th) and 1 reverse gear (RVS). “P / N” indicates a non-driving range, “P” is a parking range, and “N” is a neutral range. "RPM" indicates an engagement combination in the RVS preparation process described later, in which the brake F1 is switched from the one-way rotation permission state to the rotation prevention state.

  In the example of the engagement table of FIG. 2 (A), "o" indicates that it is in the engaged state, and no mark indicates that it is in the released state. Although not essential for establishing a shift speed, an engagement mechanism in an engaged state is included in order to smoothly shift to adjacent shift speeds. For example, in the case of the first gear (1st), the engagement of the brake B2 is not essential. However, when shifting to the reverse gear (RVS) or the second gear (2nd), there are few engagement mechanisms that switch the engagement state. It is in the engaged state for the purpose of Similarly, in the case of the fifth gear (5th), the engagement of the clutch C3 is not essential, but in the case of the shift to the fourth gear (4th) or the sixth gear (6th), the engagement is switched In order to reduce the mechanism, it is in the engaged state.

  For the brake F1, "o" indicates that the rotation is in a blocking state, and "?" Indicates that a one-way rotation is permitted. In the case of the first gear (1st), the brake F1 may be in either the rotation prevention state or the one-way rotation allowance state, but in the rotation prevention state, the engine brake is enabled and in the one-way rotation allowance state Engine brake does not work. An algorithm for determining which state the brake F1 is to be in the case of the first gear (1st) can be designed as appropriate, but in the present embodiment, the state before shifting to the first gear (1st) is assumed. For example, when shifting from the reverse gear (RVS) to the first gear (1st), the first gear (1st) remains in the rotation inhibition state. However, when the vehicle speed becomes higher than a predetermined speed, etc., it switches to the one-way rotation allowable state. Similarly, when shifting from the other forward gear (2nd to 10th) to the first gear (1st), the first gear (1st) is allowed to rotate in one direction.

  Also in the non-driving range (P / N), the state of the brake F1 may be either the rotation prevention state or the one-way rotation allowable state. In the case of the present embodiment, as in the first gear (1st), the state before shifting to the non-traveling range (P / N) is assumed.

  In the second gear (2nd) to the tenth gear (10th), the brake F1 is allowed to rotate in one direction, but due to the configuration of the automatic transmission 1, the brake F1 is idle. Therefore, the state of the brake F1 is displayed as "(Δ)". If the brake F1 is a mechanical engagement mechanism capable of selecting the bidirectional rotation allowable state described above, the brake F1 should be in the bidirectional rotation allowable state in the second gear (2nd) to the tenth gear (10th). Is also possible.

  In the case of the present embodiment, in any of the second gear (2nd) to the tenth gear (10th), the one-way rotation allowable state is selected as the state of the brake F1, and the rotation prevention state is established. Although impossible, depending on the configuration of the automatic transmission 1, it is also possible to adopt a configuration in which the rotation prevention state is selected.

  In FIG. 2A, "(.smallcircle.)" Of the brake B3 in the first gear (1st) indicates that the engagement state may be established by the control described later. In the first gear, the engine brake can be switched between activation and deactivation by engagement and release of the brake B3.

  The velocity diagram of FIG. 3 shows the rotational speed ratio at each shift speed of each element with respect to the input to the input shaft 10. The vertical axis indicates the speed ratio, “1” indicates that the number of rotations is the same as that of the input shaft 10, and “0” indicates that the motor is at rest. The horizontal axis is based on the gear ratio between the rotating elements of the planetary gear mechanisms P1 to P4. λ indicates the gear ratio between the carrier Cr and the sun gear S. In FIG. 3, elements corresponding to the output shaft 13 are not shown.

<Control device>
FIG. 4 is a block diagram of a control device 100 of the automatic transmission 1. The control device 100 can control not only the automatic transmission 1 but also each control of the internal combustion engine EG and the torque converter TC, but in the case of this embodiment, the internal combustion engine EG is an engine provided separately from the control device 100 A configuration controlled by the ECU 200 is assumed. The control device 100 can receive various information of the internal combustion engine EG and the vehicle from the engine ECU 200. Further, the control device 100 can also transmit information of the automatic transmission 1 to the engine ECU 200.

  The control device 100 includes a processing unit 101 such as a CPU, a storage unit 102 such as a RAM and a ROM, and an IF unit 103 that interfaces the external device or engine ECU with the processing unit 101. The IF unit 103 includes, for example, a communication interface, an input / output interface, and the like.

  The processing unit 101 executes a program stored in the storage unit 102, and controls various actuators 120 based on detection results of various sensors 110.

  The various sensors 110 include various sensors provided in the automatic transmission 1, but FIG. 4 exemplifies the following sensors.

The input rotational speed sensor 111 is a sensor that detects the rotational speed input from the internal combustion engine EG to the torque converter TC, that is, the rotational speed (rotational speed) of the output shaft of the internal combustion engine EG. The input shaft rotational speed sensor 112 is a sensor that detects the rotational speed (rotational speed) of the input shaft 10. Slip ratio of the torque converter TC: ETR is calculated by the following equation.
ETR (%) = (the detected rotational speed of the input shaft rotational speed sensor 112) / (the detected rotational speed of the input rotational speed sensor 111) × 100
The output rotational speed sensor 113 is a sensor that detects the rotational speed (rotational speed) of the output shaft 13.

  An SP sensor (shift position sensor) 113 is a sensor that detects a shift position selected by the driver. In the case of this embodiment, four types of shift positions are assumed: P range (parking range), D range (forward range), N range (neutral range), and R range (reverse range). When the D range is selected, the processing unit 101 selects one of the first gear position (1st) to the tenth gear position (10th) according to the shift map stored in the storage unit 102 to perform gear change. When the R range is selected, the processing unit 101 selects a reverse stage.

  The oil pressure sensor 115 includes a sensor that detects the oil pressure of each hydraulic oil of the engagement mechanisms C1 to C3 and B1 to B3. The vehicle speed sensor 116 detects the traveling speed of the vehicle on which the automatic transmission 1 is mounted.

  The various actuators 120 include various actuators provided in the automatic transmission 1. For example, an electromagnetic actuator such as an electromagnetic solenoid that switches the operating state of the engagement mechanisms C1 to C3, B1 to B3 and F1 is included. Thus, the processing unit 101 controls various actuators 120.

  FIG. 4B shows an arrangement example of the hydraulic pressure sensor 115. The hydraulic pressure sensor 115 can be provided, for example, for each of the engagement mechanisms C1 to C3 and B1 to B3. Thereby, the hydraulic pressure of the hydraulic fluid of each engagement mechanism can be detected. The hydraulic pressure sensor 115 does not necessarily have to be provided in each engagement mechanism.

  Each engagement mechanism is assigned a solenoid valve LS for supplying hydraulic fluid, and switching the engagement mechanism between engagement and release by opening or closing the hydraulic oil supply line L with the solenoid valve LS. Can. The hydraulic pressure sensor 115 is provided to supply hydraulic fluid supplied from the solenoid valve LS to the engagement mechanism, and the detection result of the hydraulic pressure sensor 115 indicates the hydraulic pressure of the hydraulic fluid supplied to the engagement mechanism. Hydraulic oil is pumped to the supply line L by an oil pump 117 driven by the internal combustion engine EG.

<TWC switching control of brake F1>
In the case of the present embodiment, in reverse gear, the brake F1 is in the rotation inhibition state. When switching from the forward gear or the non-driving range to the reverse gear, the brake F1 may be switched from the one-way rotation permission state to the rotation prevention state. At this time, it is preferable that the differential rotation speed between the side of the casing 12 of the brake F1 and the side of the carrier Cr2 be zero in order to reduce the generation of abnormal noise and vibration. In other words, it is preferable that the rotation number of the carrier Cr2 be zero.

  Therefore, a combination of engagement mechanisms in which the rotational speed of the carrier Cr2 is zero is passed. In the case of this embodiment, since there is no sensor that directly measures the rotation speed of the carrier Cr2, the carrier Cr2 and the input shaft 10 are connected, and the rotation speed of the carrier Cr2 is Confirm that it is 0. Thereafter, the brake F1 is switched to the rotation blocking state.

  FIG. 5 shows an engagement combination of the engagement mechanism when switching the shift position from the forward first gear to the reverse gear. When the gear is in the forward first gear, the brakes B1 and B2 are in the engaged state as shown in FIG. 2 (A). It is assumed that the brake F1 is in the one-way rotation allowable state.

  First, as shown in step 1 of FIG. 5, the brakes B1 and B2 are controlled to the released state. When the release of the brakes B1 and B2 is completed, the process shifts to the next phase 2.

  In stage 2, the clutches C1, C3 and the brake B3 are engaged. The ring gear R2 and the output shaft 13 are rotatable, and the drive wheels can freely rotate. Thus, it is possible to avoid a situation in which the vehicle exhibits unexpected behavior.

  As apparent from the velocity diagram of FIG. 3, the input shaft 10 is fixed to the casing 12 by engaging the clutch C3 and the brake B3. By engaging the clutch C1, the carrier Cr2 is connected to the input shaft 10.

  Note that, in the present embodiment, although the configuration is such that step 2 is performed after step 1, step 1 and step 2 may be performed simultaneously. Specifically, the control for engaging the clutches C1 and C3 and the brake B3 may be performed while performing the control for releasing the brakes B1 and B2. By doing this, it is possible to improve the responsiveness when switching the shift position to the reverse shift position.

  Next, when a predetermined condition is established, the process proceeds to the next stage 3. The predetermined condition is a condition under which it is confirmed that the rotation number of the carrier Cr2 is zero. Basically, it is the completion of engagement of the clutch C1 and the detection result of the input rotation speed sensor 111 <predetermined value (for example, a value that can be regarded as 0). The completion of engagement of the clutch C1 is, for example, that the engagement is completed when the detection result of the C1 oil pressure sensor 114 indicates a predetermined oil pressure or when the control amount for the solenoid valve LS for the clutch C1 reaches a specified value It can be determined. The same determination method can be adopted for the completion of engagement of other engagement mechanisms.

  In step 3, the brake F1 is switched from the one-way rotation permission state to the rotation prevention state. Since the differential rotation between the side of the casing 12 of the brake F1 and the side of the carrier Cr2 is 0, the generation of abnormal noise and vibration can be avoided. When the switching of the brake F1 is completed, the process proceeds to step 4. In step 4, the clutch C1 and the brake B3 are released and the brake B2 is engaged. Thus, the combination of reverse stages is established (FIG. 2A).

  The processes of stages 2 and 3 may be referred to as RVS preparation process, and the process of stage 4 may be referred to as RVS in-gear process. In terms of control, when stage 1 is completed, the RVS preparation mode is set as the control state of the shift stage, and when the RVS preparation mode is set, RVS preparation processing is performed. Further, when the stage 3 is completed, the RVS in-gear mode is set as the control state of the shift stage, and the RVS in-gear processing is performed when the RVS in-gear mode is set. Such mode setting is managed by providing a storage area of mode information in the storage unit 102, for example.

  An example of processing executed by the processing unit 101 related to the control content of FIG. 5 will be described with reference to FIGS. 6 (A) and 6 (B).

  Reference is made to FIG. In S11, it is determined whether a condition for switching the brake F1 from the one-way rotation permission state to the rotation prevention state is satisfied. In the present embodiment, when the brake F1 is in the one-way rotation allowable state and the SP sensor 114 detects that the driver has switched the shift range from the other range to the reverse range, this condition is satisfied. It is determined that When it corresponds, it progresses to S12, and when it does not correspond, it progresses to S14.

  In S12, as described in step 1 of FIG. 5, the engagement mechanism (for example, the brakes B1 and B2) in the engaged state is released. In S13, the RVS preparation mode is set as the control mode. Then, it progresses to S15.

  In S14, it is determined whether the RVS preparation mode is being set. When it corresponds, it progresses to S15, and when it does not correspond, it progresses to S16. At S15, RVS preparation processing is performed. Details will be described later. In S16, another process is performed to end one unit process.

  Reference is made to FIG. This figure is a flowchart showing the RVS preparation process of S15. In S21, torque limitation of the drive source of the automatic control device 1 is executed. For example, the output of the internal combustion engine EG is reduced in a range where the required oil pressure of the engagement mechanism etc. is secured.

  At S22, it is determined whether the switching of the brake F1 to the rotation prevention state is completed. When it corresponds, it progresses to S26, and when it does not correspond, it progresses to S23.

  At S23, as described in step 2 of FIG. 5, the control for engaging the clutches C1 and C3 and the brake B3 is started. The engagement of the clutches C1 and C3 and the brake B3 can be performed by gradually increasing the control amount to these solenoid valves LS, and the engagement is completed by repeating the process of S23 a plurality of times. become.

  In S24, as described in step 2 of FIG. 5, it is determined whether the engagement of the clutch C1 is completed and the number of rotations of the input shaft 10 = 0. If all the conditions are satisfied, the process proceeds to S25. If not satisfied, the process of one unit is ended.

  At S25, as described in step 3 of FIG. 5, the state of the brake F1 is switched to the rotation prevention state. Since the differential rotation speed between the casing 12 side of the brake F1 and the carrier Cr2 side is switched to 0, generation of abnormal noise and vibration can be prevented, and breakage of the brake F1 can be avoided.

  At S26, the setting of the RVS preparation mode is canceled. In S27, the RVS in-gear mode is set. With this setting, in the separate routine (for example, S16 in FIG. 6A), as described in step 4 of FIG. 5, the clutch C1 and the brake B3 are released and the brake B2 is engaged. Thus, the process ends.

<Mechanical engagement mechanism>
The brake F1 is configured to perform mechanical drive transmission. In the case of this type of engagement mechanism, switching of the state may not be performed smoothly depending on the action state of the load on the internal engagement portion. This point is explained below.

  FIG. 7 is a partial perspective view showing a structural example of the brake F1 in the present embodiment. FIG. 8A is a cross-sectional view taken along line X-X of FIG.

  The brake F1 includes a fixed plate TW11 fixed to the casing 12, a rotating plate TW12 (not shown in FIG. 7) fixed to the carriers Cr1 and Cr2, and a switching plate TW20. The fixed plate TW11 is formed in an annular shape (donut shape). Further, the rotating plate TW12 is also formed in an annular shape (donut shape) similarly to the fixed plate TW11, and the fixed plate TW11 and the rotating plate TW12 are arranged concentrically.

  Storage portions TW15 and TW16 are formed in the fixed plate TW11. A swinging portion TW13 is swingably provided in the storage portion TW15. Further, a swinging portion TW14 is provided swingably in the storage portion TW16. The rocking centers of the rocking portion TW13 and the rocking portion TW14 are located at opposite ends. The storage section TW15 is provided with a spring 17a for swaying the swinging section TW13 in one direction, and the storage section TW16 is provided with a spring 17b for biasing the swinging section TW14 in one direction.

  The rotary plate TW12 is formed with a recess TW18 engaged with the swinging portion TW13, and a recess TW19 engaged with the swinging portion TW14.

  The switching plate TW20 is disposed between the fixed plate TW11 and the rotating plate TW12. The switching plate TW20 is also formed in an annular shape (donut shape). In the switching plate TW20, cutout holes TW20a and TW20b are provided at positions corresponding to the swinging portions TW13 and TW14. At the outer edge of the switching plate TW20, a protrusion TW20c that protrudes radially outward is provided. The switching plate TW20 is pivotable relative to the fixed plate TW11, and the switching plate TW20 can be pivoted relative to the fixed plate TW11 by urging the projection TW20c with an electromagnetic actuator or a hydraulic actuator.

  FIG. 8 (A) shows the rotation prevention state. That is, the swinging portion TW13 engages with the recess TW18, and the swinging portion TW14 engages with the recess TW19. For this reason, the rotating plate TW12 can not rotate relative to the fixed plate TW11.

  By swinging the switching plate TW20 from the rotation prevention state, it is possible to switch to the one-way rotation permitting state. FIG. 8B shows an example thereof. In the example shown in the figure, the swinging portion TW13 is pressed against the edge of the notch hole TW20a of the switching plate TW20 by the movement of the switching plate TW20, and is stored in the storage portion TW15. Thus, the engagement between the swinging portion TW13 and the recess TW18 is released. In this state, the engagement between the swinging portion TW14 and the recess TW19 is maintained, and therefore, the rotating plate TW12 can rotate in one direction only with respect to the fixed plate TW11 (one-way rotation permitted state).

  Thus, in accordance with the position of the switching plate TW20, it is possible to switch between the rotation blocking state and the one-way rotation permitting state.

  Next, the case where the switching of the state of the brake F1 can not be performed smoothly will be described. In the case of this embodiment, as described above, when the brake F1 is in the rotation inhibition state in the first gear, the engine brake is activated. Reference is made to FIGS. 9A and 9B. FIGS. 9A and 9B assume the case where the brake F1 is in the rotation inhibition state at the first speed.

  FIG. 9A shows the time of acceleration, and the driving force of the internal combustion engine EG acts on the rotating plate TW12 fixed to the carriers Cr1 and Cr2 in the direction of the arrow D1. This load is borne by the rocking portion TW14, and not by the rocking portion TW13. Therefore, it is possible to swing the switching plate TW20 and switch it to the one-way rotation allowable state of FIG. 8 (B).

  FIG. 9 (B) shows the time of deceleration and the case where the vehicle is descenting down a slope. The driving force from the wheels in the direction of arrow D2 acts on the rotating plate TW12 fixed to the carriers Cr1 and Cr2. This load is borne by the rocking portion TW13, and is not borne by the rocking portion TW14. In this state, even if it is attempted to rock the rocking portion TW13 to the state of FIG. 8B by the rocking of the switching plate TW20, since the end of the rocking portion TW13 is engaged with the concave portion TW18, the switching is smoothly performed. There are cases where it can not be done. That is, when the first gear is selected, when the brake F1 is switched from the rotation inhibition state to the one-way rotation allowable state, the traveling state is restricted.

  As a countermeasure, when the first gear is selected, it is also conceivable to keep the brake F1 in a one-way rotation allowable state at all times. However, in the case of parking in a garage, etc., the forward range and the reverse range may be alternately and repeatedly selected. In order to establish the reverse gear, it is necessary to put the brake F1 in the rotation prevention state by the RVS preparation processing, and there is a time lag between the driver selecting the R range and the reverse gear being established. There is. Therefore, the restriction of the traveling state is reduced as much as possible by engaging the brake B3 by the following switch preparation control.

<OWC switching preparation control for brake F1 and OWC switching control>
In the present embodiment, due to the structure of the automatic transmission 1, when the shift speed is the first speed and the brake F1 is in the one-way rotation permission state, the brake Cr acts on the carriers Cr1 and Cr2 by the engagement of the brake B3. The load in the direction D2 can be borne by the brake B3.

  Specifically, referring to the velocity diagram of FIG. 3, the brakes B1 and B2 are engaged when the first gear is selected. When the brake B3 is engaged in this state, the carriers Cr4 and Cr3 and the ring gear R1 are fixed. Furthermore, carriers Cr1 and Cr2 are fixed. Since the carriers Cr1 and Cr2 are fixed by the brake F1 engaging the brake B3 in the one-direction rotation allowable state, the brake B3 (and the brakes B1 and B2) bear the load acting on the carriers Cr1 and Cr2. become.

In the case of the present embodiment, in the case of the engagement combination of the first gear in FIG. 2 (A) with the brake F1 in the one-direction rotation permitted state, as already described, the engine brake is activated by the engagement and release of the brake B3. And can be switched between invalidation. That is, in one speed, when the engagement combination one speed brake F1 is a one-way rotation permitting state, when engaging the brake B3 is an engine brake is activated, single-speed brake F 1 is in a rotation preventing state This is equivalent to the case of the stage engagement combination. Even the brake F 1 is further engaged brake B3 at a rotation blocking state, it does not cause trouble any the travel.

  When the brake F1 engages the brake B3 in the rotation inhibition state, as shown in FIG. 9B, even if the driving force from the wheels acts on the carriers Cr1 and Cr2 in the direction of the arrow D2, the brake B3 (and The loads are also borne by the brakes B1, B2). As a result, the load on the rocking portion TW13 is reduced or close to zero, and the end of the rocking portion TW13 does not strongly engage with the recess TW18. In particular, if the brake B3 is engaged before the load in the direction of arrow D2 acts on the brake F1, then, even if the load in the direction of arrow D2 acts, the brake B3 bears the load and the brake F1 is substantially Not be burdened by

  By engaging the brake B3 in this way, the brake F1 can be smoothly switched from the rotation blocking state to the one-way rotation permitting state even when the vehicle is decelerating or when the vehicle falls down the slope with inertia. . Even if the brake B3 is engaged in advance at the time of the first gear selection, there is no hindrance to traveling.

  Next, an example of processing performed by the processing unit 101 regarding this switching preparation control will be described with reference to FIG.

In S31, it is determined whether or not the brake F1 is TWC (rotation inhibition state). If the brake F1 is a TWC, the process proceeds to S32, and if it is an OWC (one-way rotation permitted state), the process of one unit is ended. In S3 2 determines whether the current gear position is one speed. If one speed proceeds to S 3 3, if not in one speed stage ends the processing of one unit.

  In S33, it is determined whether or not the load in the direction D2 acts on the carriers Cr1 and Cr2 (with respect to the brake F1). Although other parameters can be adopted for the load determination, in the present embodiment, it is determined whether or not the slip ratio of the torque converter TC is less than a specified value based on the slip ratio of the torque converter TC.

  Specifically, it is determined whether the ETR described above is less than 100%. In the case where the ETR is less than 100%, the detected rotational speed of the input rotational speed sensor 111 is larger than the detected rotational speed of the input shaft rotational speed sensor 112, that is, the driving force is input from the internal combustion engine EG. Is in an accelerated state. Conversely, when the ETR is not less than 100%, the detected rotational speed of the input rotational speed sensor 111 is less than or equal to the detected rotational speed of the input shaft rotational speed sensor 112, that is, the vehicle is in constant speed or decelerating, or the vehicle is This is a case where the road slope is descent with inertia, and the load in the direction D2 (with respect to the brake F1) is likely to be strongly applied to the carriers Cr1 and Cr2.

  If the ETR is less than 100% in S33, the process proceeds to S34. If the ETR is not less than 100%, the processing of one unit is ended.

  At S34, the brake B3 is engaged. As a result, before the load in the direction D2 is strongly applied to the carriers Cr1 and Cr2 (with respect to the brake F1), preparations for being able to bear this load by the brake B3 are made. In the present embodiment, although the brake B3 is engaged when the ETR is less than 100%, the brake F1 is a TWC regardless of the ETR, and the brake is uniformly applied when the first gear is established. B3 may be engaged.

  Next, a processing example executed by the processing unit 101 regarding switching control to switch the brake F1 from the TWC to the OWC in the case of the first gear will be described with reference to FIG.

  In S41, it is determined whether the brake F1 is in the TWC state (rotation inhibition state). If the brake F1 is a TWC, the process proceeds to S42, and if it is an OWC (one-way rotation permitted state), the process of one unit is ended. In S42, it is determined whether or not the current gear is the first gear. If it is not the first gear position, the processing of one unit is ended.

  In S43, it is determined whether or not the selection of the forward gear at the second gear or higher is requested by the processing of the shift control or by the driver's instruction (for example, paddle operation, selection of snow traveling mode, etc.). If it is requested, the process proceeds to S45 since the possibility of being switched to the reverse stage is low. If the brake F1 is not required, it may be switched to the reverse gear, and the brake F1 may be kept at the TWC, so the process proceeds to S44. In addition, the structure which does not include the conditions of this shift up is also employable.

  In S44, it is determined whether the vehicle speed is less than the specified vehicle speed. If the vehicle speed is less than the specified vehicle speed, the processing of one unit is ended, and if it is equal to or more than the specified vehicle speed, the process proceeds to S45. If the vehicle speed is less than the specified vehicle speed, it may be switched to reverse gear. Therefore, in the present embodiment, the switching condition includes that the vehicle speed is equal to or higher than the specified vehicle speed. Therefore, in the present embodiment, the switching condition includes that the vehicle speed is equal to or higher than the specified vehicle speed. However, a configuration that does not include the condition of the vehicle speed may be employed. The prescribed vehicle speed can be, for example, 8 km / h. Alternatively, for example, 5 km / h may be used. Alternatively, for example, 3 km / h may be used.

  In S45, it is determined whether or not a load in the direction D2 acts on the carriers Cr1 and Cr2 (with respect to the brake F1). Although other parameters may be adopted for the load determination, in the present embodiment, as in S33 of FIG. 10, based on the slip ratio of the torque converter TC, it is determined whether the slip ratio of the torque converter TC is less than a specified value. judge. Specifically, it is determined whether the ETR described above is less than 100%. If the ETR is less than 100%, the process proceeds to S47. If the ETR is greater than 100%, the process proceeds to S46.

  As described above, when the ETR is less than 100%, the detected rotational speed of the input rotational speed sensor 111 is larger than the detected rotational speed of the input shaft rotational speed sensor 112, that is, the driving force is input from the internal combustion engine EG. And the vehicle is accelerating. Conversely, when the ETR is not less than 100%, the detected rotational speed of the input rotational speed sensor 111 is less than or equal to the detected rotational speed of the input shaft rotational speed sensor 112, that is, the vehicle is in constant speed or decelerating, or the vehicle is This is a case where the road slope is descent with inertia, and the load in the direction D2 (with respect to the brake F1) is likely to be strongly applied to the carriers Cr1 and Cr2.

  If the ETR is less than 100%, the load in the direction D2 does not act on the carriers Cr1 and Cr2 (with respect to the brake F1), so the brake F1 is switched from TWC to OWC in S47.

  When the ETR is 100% or more, the load in the D2 direction (with respect to the brake F1) acts on the carriers Cr1 and Cr2, but in the state in which the brake B3 is engaged by the process of FIG. The brake F1 can be switched from the TWC to the OWC. Therefore, it is determined in S46 whether or not the brake B3 is engaged. If it is engaged, the brake F1 is switched from the TWC to the OWC in S47. When the brake B3 is not engaged, the brake F1 is kept as TWC, and one unit of processing is ended.

  The determination as to whether or not the brake B3 is engaged at S46 may be made, for example, based on whether or not the detection result of the supplied oil pressure to the brake B3 has reached a prescribed oil pressure. Further, in S46, in addition to the engagement of the brake B3, the condition that the actual ratio of the automatic transmission 1 is a ratio corresponding to the first gear may be used. The actual ratio can be calculated from the detection results of the input shaft rotational speed sensor 112 and the output rotational speed sensor 113.

<Summary of the embodiment>
1. The control device (for example, 100) of the above embodiment is
A control device of an automatic transmission (for example, 1),
The automatic transmission
An input shaft (e.g., 10) to which a driving force is input from a driving source (e.g., EG) via a torque converter (e.g., TC);
An output member (e.g. 11);
A plurality of planetary gear mechanisms (for example, P1-P4) for transmitting the driving force input to the input shaft to the output member;
A plurality of engagement mechanisms (for example, C1-C3, B1-B3, F1) capable of establishing a plurality of shift speeds by switching transmission paths of driving forces in the plurality of planetary gear mechanisms;
One of the plurality of engagement mechanisms is a mechanical engagement mechanism (for example, F1) that functions as a brake,
The mechanical engagement mechanism is
A first state (eg, OWC) restricting only the rotation of a predetermined rotating element (eg, Cr1, Cr2) of the plurality of rotating elements included in the plurality of planetary gear mechanisms in a first direction (eg, D1); Switchable to a second state (e.g., TWC) that regulates bi-directional rotation of the first direction of the predetermined rotating element and a second direction (e.g., D2) opposite to the first direction Yes,
The plurality of shift speeds are
The lowest forward speed (for example, 1st) that the mechanical engagement mechanism can establish in any of the first state and the second state;
A forward gear (for example, 2nd-10th) that has a gear ratio higher than the lowest forward speed and the mechanical engagement mechanism can not be established in the second state;
Reverse gear (e.g., RVS) established by said mechanical engagement mechanism in said second state;
The plurality of engagement mechanisms include a predetermined engagement mechanism (eg, B3),

In the structure of the automatic transmission, the predetermined engagement mechanism is engaged by the engagement when the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the first state. It is an engagement mechanism capable of bearing a load acting on the predetermined rotating element in the second direction,
The controller is
Engagement control means (for example, S34) capable of engaging the predetermined engagement mechanism when the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the second state; ,
When the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the second state, the mechanical engagement mechanism is engaged when the predetermined engagement mechanism is engaged. Switching control means (e.g., S47) capable of switching to the first state.
It is characterized by

  According to this configuration, since the predetermined engagement mechanism is engaged, the load acting on the mechanical engagement mechanism is borne by the predetermined engagement mechanism, and the mechanical engagement mechanism Can be switched. Therefore, the switching freedom degree of the mechanical engagement mechanism can be improved.

2. The control device (for example, 100) of the above embodiment is
Whether or not the load in the second direction acting on the predetermined rotating element is low when the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the second state Further includes determination means (for example, S33, S45) for determining
The engagement control means is
The predetermined engagement mechanism can be engaged under the condition that the determination means determines that the load is low (for example, S33).
It is characterized by

  According to this configuration, since the predetermined engagement mechanism is engaged before the load acts on the mechanical engagement mechanism, the load acting on the mechanical engagement mechanism is more Many can be borne by the predetermined engagement mechanism, and the mechanical engagement mechanism can be switched. Therefore, the switching freedom degree of the mechanical engagement mechanism can be improved.

3. The control device (for example, 100) of the above embodiment is
The switching control means
When the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the second state, the predetermined engagement mechanism is engaged, or the determination means is a load May be switched to the first state, provided that it has been determined that is low.
It is characterized by

  According to this configuration, while switching the state in the switchable traveling state of the mechanical engagement mechanism, it is possible to switch even when the predetermined engagement mechanism is engaged, and the mechanical engagement mechanism is switched The degree of freedom can be further improved.

4. The control device (for example, 100) of the above embodiment is
First detection means (for example, 111) for detecting the number of revolutions input from the drive source to the torque converter;
The second detection means (for example, 112) for detecting the number of rotations of the input shaft;
The determination means
When the shift speed is the lowest forward speed and the mechanical engagement mechanism is in the second state, based on the detection results of the first detection means and the second detection means, It is determined whether the load in the second direction acting on the predetermined rotating element is low or not.
It is characterized by

  According to this configuration, it is possible to more accurately determine the operating state of the load.

5. The control device (for example, 100) of the above embodiment is
The determination means operates in the second direction acting on the predetermined rotation element when the number of rotations detected by the second detection means is equal to or more than the number of rotations detected by the first detection means. It is determined that the load is not low (for example, S33, S45),
It is characterized by

  According to this configuration, it can be determined that the load in the second direction acts in the state where the engine brake acts.

6. The control device (for example, 100) of the above embodiment is
The lowest forward speed is an engine brake enabled when the mechanical engagement mechanism is in the second state,
The lowest forward speed is an engine brake activated when the predetermined engagement mechanism is engaged when the mechanical engagement mechanism is in the first state.
It is characterized by

  According to this configuration, the engagement of the predetermined engagement mechanism in the first state by the mechanical engagement mechanism is equivalent to the second state of the mechanical engagement mechanism. When switching the mechanical engagement mechanism from the second state to the first state, the predetermined engagement mechanism can bear the load to be applied to the mechanical engagement mechanism.

7. The control device (for example, 100) of the above embodiment is
The switching control means
The mechanical engagement mechanism can be switched to the first state on condition that a shift to a gear having a gear ratio higher than that of the lowest forward gear is requested.
It is characterized by

  According to this configuration, while responding to a shift request to a shift speed with a high gear ratio, by maintaining the second state when there is no shift request, it is possible to respond promptly by switching to reverse shift.

8. The control device (for example, 100) of the above embodiment is
The switching control means
The mechanical engagement mechanism can be switched to the first state on condition that the vehicle speed is equal to or higher than a specified vehicle speed.
It is characterized by

  According to this configuration, it is possible to shift to the shift speed with a high gear ratio according to the vehicle speed, and at the time of low speed, by maintaining the second state, it is possible to respond promptly by switching to reverse shift.

9. The control device (for example, 100) of the above embodiment is
The determination means acts on the mechanical engagement mechanism when the slip ratio of the torque converter based on the detection results of the first detection means and the second detection means is less than a specified value. Determine that the load in the second direction is low,
It is characterized by

  According to this configuration, it is possible to determine the state of the load using the slip ratio.

10. The control device (for example, 100) of the above embodiment is
A control device of an automatic transmission (for example, 1),
The automatic transmission
An input shaft (e.g., 10) to which a driving force is input from a driving source (e.g., EG) via a torque converter (e.g., TC);
An output member (e.g. 11);
A plurality of planetary gear mechanisms (for example, P1-P4) for transmitting the driving force input to the input shaft to the output member;
A plurality of engagement mechanisms (for example, C1-C3, B1-B3, F1) capable of establishing a plurality of shift speeds by switching transmission paths of driving forces in the plurality of planetary gear mechanisms;
One of the plurality of engagement mechanisms is a mechanical engagement mechanism (for example, F1) that functions as a brake,
The mechanical engagement mechanism is
A first state in which only rotation of a predetermined rotating element (for example, Cr1, Cr2) of a plurality of rotating elements included in the plurality of planetary gear mechanisms is restricted in a first direction (for example, D1); Switchable to a second state that restricts bi-directional rotation of the second direction (e.g., D2) opposite to the first direction and the second direction,
The plurality of shift speeds are
The lowest forward speed (for example, 1st) that the mechanical engagement mechanism can establish in any of the first state and the second state;
A forward gear (for example, 2nd-10th) that has a gear ratio higher than the lowest forward speed and the mechanical engagement mechanism can not be established in the second state;
Reverse gear (e.g., RVS) established by said mechanical engagement mechanism in said second state;
The plurality of engagement mechanisms include a predetermined engagement mechanism (eg, B3),

In the structure of the automatic transmission, the predetermined engagement mechanism is engaged by the engagement when the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the first state. It is an engagement mechanism capable of bearing a load acting on the predetermined rotating element in the second direction,
The controller is
First detection means (for example, 111) for detecting the number of revolutions input from the drive source to the torque converter;
Second detecting means (for example, 112) for detecting the number of rotations of the input shaft;
Determining means (for example, S33, S45) for determining whether the number of rotations detected by the second detection means is smaller than the number of rotations detected by the first detection means;
Engagement control means (for example, S34) capable of engaging the predetermined engagement mechanism when the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the second state; ,
Switching control means capable of switching the mechanical engagement mechanism to the first state when the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the second state For example, S47), and
The engagement control means is
The predetermined engagement mechanism can be engaged on condition that the determination means is determined to be small (for example, S33).
It is characterized by

  According to this configuration, since the predetermined engagement mechanism is engaged, the load acting on the mechanical engagement mechanism is borne by the predetermined engagement mechanism, and the mechanical engagement mechanism Can be switched. Therefore, the switching freedom degree of the mechanical engagement mechanism can be improved.

P1 to P4 Planetary gear mechanisms C1 to C3, B1 to B3, F1 Engagement mechanism 1 Automatic transmission 100 Control device

Claims (10)

A control device for an automatic transmission,
The automatic transmission
An input shaft to which driving force is input from a driving source via a torque converter;
An output member,
A plurality of planetary gear mechanisms for transmitting the driving force input to the input shaft to the output member;
And a plurality of engagement mechanisms capable of establishing a plurality of shift speeds by switching transmission paths of driving forces in the plurality of planetary gear mechanisms,
One of the plurality of engagement mechanisms is a mechanical engagement mechanism that functions as a brake,
The mechanical engagement mechanism is
A first state in which only rotation of a predetermined one of a plurality of rotating elements included in the plurality of planetary gear mechanisms is restricted; a first state of the predetermined rotating element; and the first state Switchable to a second state in which rotation in a second direction opposite to the second direction is restricted.
The plurality of shift speeds are
A lowest forward speed at which the mechanical engagement mechanism can be established in any of the first state and the second state;
A forward gear that has a gear ratio higher than the lowest forward speed, and the mechanical engagement mechanism can not be established in the second state;
Reverse gearing, wherein said mechanical engagement mechanism establishes in said second state;
The plurality of engagement mechanisms include a predetermined engagement mechanism,
The predetermined engagement mechanism does not require the engagement to establish the lowest forward speed , and the shift stage is the lowest forward speed in terms of the structure of the automatic transmission, and the mechanical clutch An engagement mechanism capable of bearing a load acting on the predetermined rotating element in the second direction by the engagement when the engagement mechanism is in the second state;
The controller is
Engagement control means capable of engaging the predetermined engagement mechanism when the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the second state;
When the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the second state, the mechanical engagement mechanism is engaged when the predetermined engagement mechanism is engaged. Switching control means capable of switching the state to the first state;
A control device characterized by The control device according to claim 1, wherein
The controller is
In the case where the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the second state, parameters and regulations related to the load in the second direction acting on the predetermined rotary element The apparatus further comprises a determination unit that determines whether the load is low by comparing the value with the value .
The engagement control means is
The predetermined engagement mechanism can be engaged on condition that the determination means determines that the load is low.
A control device characterized by The control device according to claim 2,
The switching control means
When the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the second state, the predetermined engagement mechanism is engaged, or the determination means is a load May be switched to the first state, provided that it has been determined that is low.
A control device characterized by The control device according to claim 2,
First detection means for detecting the number of revolutions input from the drive source to the torque converter;
And second detecting means for detecting the number of rotations of the input shaft,
The determination means
When the shift speed is the lowest forward speed and the mechanical engagement mechanism is in the second state, based on the detection results of the first detection means and the second detection means, It is determined whether the load in the second direction acting on the predetermined rotating element is low or not.
A control device characterized by The control device according to claim 4,
The determination means operates in the second direction acting on the predetermined rotation element when the number of rotations detected by the second detection means is equal to or more than the number of rotations detected by the first detection means. Determine that the load is not low,
A control device characterized by The control device according to claim 1, wherein
The lowest forward speed is an engine brake enabled when the mechanical engagement mechanism is in the second state,
The lowest forward speed is an engine brake activated when the predetermined engagement mechanism is engaged when the mechanical engagement mechanism is in the first state.
A control device characterized by The control device according to claim 1, wherein
The switching control means
The mechanical engagement mechanism can be switched to the first state on condition that a shift to a gear having a gear ratio higher than that of the lowest forward gear is requested.
A control device characterized by The control device according to claim 1, wherein
The switching control means
The mechanical engagement mechanism can be switched to the first state on condition that the vehicle speed is equal to or higher than a specified vehicle speed.
A control device characterized by The control device according to claim 4 ,
The determination means acts on the mechanical engagement mechanism when the slip ratio of the torque converter based on the detection results of the first detection means and the second detection means is less than a specified value. It is determined that the load in the second direction is low ,
The slip ratio is
Slip ratio = (rotational speed detected by the second detection means) / (rotational speed detected by the first detection means) × 100
Identified by
A control device characterized by A control device for an automatic transmission,
The automatic transmission
An input shaft to which driving force is input from a driving source via a torque converter;
An output member,
A plurality of planetary gear mechanisms for transmitting the driving force input to the input shaft to the output member;
And a plurality of engagement mechanisms capable of establishing a plurality of shift speeds by switching transmission paths of driving forces in the plurality of planetary gear mechanisms,
One of the plurality of engagement mechanisms is a mechanical engagement mechanism that functions as a brake,
The mechanical engagement mechanism is
A first state in which only rotation of a predetermined one of a plurality of rotating elements included in the plurality of planetary gear mechanisms is restricted; a first state of the predetermined rotating element; and the first state Switchable to a second state in which rotation in a second direction opposite to the second direction is restricted.
The plurality of shift speeds are
A lowest forward speed at which the mechanical engagement mechanism can be established in any of the first state and the second state;
A forward gear that has a gear ratio higher than the lowest forward speed, and the mechanical engagement mechanism can not be established in the second state;
Reverse gearing, wherein said mechanical engagement mechanism establishes in said second state;
The plurality of engagement mechanisms include a predetermined engagement mechanism,
In the structure of the automatic transmission, the predetermined engagement mechanism is engaged by the engagement when the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the first state. It is an engagement mechanism capable of bearing a load acting on the predetermined rotating element in the second direction,
The controller is
First detection means for detecting the number of revolutions input from the drive source to the torque converter;
Second detection means for detecting the number of rotations of the input shaft;
A determination unit that determines whether the number of rotations detected by the second detection unit is smaller than the number of rotations detected by the first detection unit;
Engagement control means capable of engaging the predetermined engagement mechanism when the shift stage is the lowest forward speed and the mechanical engagement mechanism is in the second state;
Switching control means capable of switching the mechanical engagement mechanism to the first state when the transmission gear position is the lowest forward speed and the mechanical engagement mechanism is in the second state; , Including
The engagement control means is
The predetermined engagement mechanism can be engaged on condition that the determination means is determined to be small.
A control device characterized by

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