Rotation limiting control device, rotation limiting device, and vehicle

Abstract

The rotation restriction control device of the present application includes a selection section that selects a rotation restriction state based on a road surface on which a vehicle is traveling and a road surface at the time when the vehicle enters a parking state, and a control section that controls the rotation restriction state of the restriction mechanism in correspondence with the selection result of the selection section in the case where the vehicle enters the parking state.

Description

TECHNICAL FIELD

[0001] The present application relates to a rotation restriction control device, a rotation restriction device, and a vehicle. BACKGROUND

[0002] Conventionally, a vehicle provided with a parking mechanism that restricts rotation of a transmission at the time of parking is known (for example, refer to Patent Literature 1). Such a parking mechanism is provided with a parking gear or the like, and based on operation of an operation lever by a driver or the like, an actuator in the mechanism is caused to act, and the vehicle is brought into a parked state.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Laid-Open No. 2001-289317 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, in the case where the vehicle is brought into a parked state on an inclined road surface such as a slope, a large load can be applied to the parking mechanism due to the weight of the vehicle stopped on the inclined road surface, and the operability at the time of release of parking can be affected.

[0008] An object of the present application is to provide a rotation restriction control device, a rotation restriction device, and a vehicle that can improve the operability at the time of release of parking.

[0009] SOLUTION TO PROBLEM

[0010] The rotation restriction control device of the present application is a rotation restriction control device for a vehicle provided with a restriction mechanism that can select a rotation restriction state from at least two states including a first state that restricts rotation in a forward direction only and a second state that restricts rotation in a reverse direction only, and the rotation restriction control device is provided with:

[0011] a selection section that selects the rotation restriction state based on a road surface on which the vehicle is traveling and a road surface on which the vehicle is brought into a parked state; and

[0012] a control section that controls the rotation restriction state of the restriction mechanism in correspondence with the selection result of the selection section in the case where the vehicle is brought into a parked state.

[0013] The rotation restriction device of the present application is provided with:

[0014] A restriction mechanism is provided on a power transmission side of a transmission mounted on a vehicle, and is capable of selecting a rotation restriction state from at least two states including a first state in which rotation in a forward direction is restricted only and a second state in which rotation in a reverse direction is restricted only.

[0015] The above-described rotation restriction control device.

[0016] The vehicle of the present application is provided with a transmission and the above-described rotation restriction device.

[0017] Effects of the Invention

[0018] According to the present application, operability at the time of releasing parking can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a view showing the structure of a vehicle provided with the rotation restriction control device of the embodiment of the present application.

[0020] Figure 2A is a view showing a vehicle in which a downwardly inclined surface has entered a parked state.

[0021] Figure 2B is a view showing a vehicle in which an upwardly inclined surface has entered a parked state.

[0022] Figure 2C is a view showing a vehicle in which a flat surface has entered a parked state.

[0023] Figure 3 is a flowchart showing an example of an example of action at the time of executing rotation restriction control in the rotation restriction control device.

[0024] Figure 4 is a flowchart showing an example of an example of action at the time of executing control for releasing rotation restriction in the rotation restriction control device. DETAILED DESCRIPTION

[0025] Hereinafter, the present embodiment will be described in detail based on the drawings. Figure 1 is a view showing the structure of a vehicle 1 provided with the rotation restriction control device 100 of the embodiment of the present application.

[0026] As shown in Figure 1 , the vehicle 1 has a propeller shaft 2, a differential gear 3, a drive wheel 4, an engine 5, a transmission 6, a slope sensor 7, a parking signal output portion 8, a restriction mechanism 10, and a rotation restriction control device 100.

[0027] The engine 5 is, for example, an internal combustion engine such as a diesel engine. The power of the engine 5 is transmitted to the transmission 6 via a clutch not shown, and the power transmitted to the transmission 6 is transmitted to the drive wheel 4 via the propeller shaft 2 and the differential gear 3.

[0028] The transmission 6 is, for example, a manual transmission, an automatic transmission (e.g., an AMT (Automated Manual Transmission)), or the like, and constitutes a plurality of shift stages. In other words, the transmission 6 has a shift mechanism or the like that connects or disconnects the output shaft of the engine 5 to or from the drive shaft 2 and changes the shift ratio.

[0029] The gradient sensor 7 is a publicly known sensor that detects gradient information of a road surface on which the vehicle 1 travels.

[0030] The parking signal output section 8 outputs a parking signal indicating that the vehicle 1 is in a parking state to the rotation restriction control device 100, for example, in a case where the position of a lever in the vehicle 1 is switched to a parking range. Note that the parking signal output section 8 can also output the parking signal in correspondence with factors other than the position of the lever.

[0031] The restriction mechanism 10 is a mechanism for restricting the rotation of the transmission 6. Specifically, the restriction mechanism 10 is constituted by a one-way clutch mechanism provided on the drive shaft 2 on the power transmission side of the transmission 6, and has a first one-way clutch 11 and a second one-way clutch 12.

[0032] The first one-way clutch 11 and the second one-way clutch 12 are selectable one-way clutches, and are configured to be selectable between a restriction state in which the rotation in the forward direction or the reverse direction of the vehicle 1 is restricted, and a release state in which the restriction state is released.

[0033] The first one-way clutch 11 is configured to be able to restrict the rotation in the forward direction of the vehicle 1 in the transmission 6. The second one-way clutch 12 is configured to be able to restrict the rotation in the reverse direction of the vehicle 1 in the transmission 6.

[0034] Note that, as the structure of the first one-way clutch 11 and the second one-way clutch 12, i.e., the structure of the selectable one-way clutches, publicly known structures can be used. In addition, the first one-way clutch 11 and the second one-way clutch 12 are fixed to appropriate positions of the transmission 6 or the like.

[0035] In addition, in the Figure 1 In the first one-way clutch 11 and the second one-way clutch 12 are arranged in the order of the first one-way clutch 11, the second one-way clutch 12 with respect to the transmission 6, but the arrangement order of the first one-way clutch 11 and the second one-way clutch 12 can also be reversed. In addition, the first one-way clutch 11 and the second one-way clutch 12 can be arranged adjacent to each other, or can be arranged apart from each other.

[0036] The restriction mechanism 10 is configured to have a first one-way clutch 11 and a second one-way clutch 12, so that a rotation restriction state can be selected from among a first state, a second state, and a third state.

[0037] The first state is a state in which rotation in the forward direction in the transmission 6 is restricted only, and is a state in which the first one-way clutch 11 is in a restriction state and the second one-way clutch 12 is in a release state.

[0038] The second state is a state in which rotation in the reverse direction in the transmission 6 is restricted only, and is a state in which the first one-way clutch 11 is in a release state and the second one-way clutch 12 is in a restriction state.

[0039] The third state is a state in which rotation in both the forward direction and the reverse direction in the transmission 6 is restricted, and is a state in which both the first one-way clutch 11 and the second one-way clutch 12 are in a restriction state.

[0040] In addition, the restriction mechanism 10 is provided with a restriction release state in which the rotation restriction state is released, in a case where the vehicle 1 is running, or the like. The restriction release state is a state in which both the first one-way clutch 11 and the second one-way clutch 12 are in a release state.

[0041] The rotation restriction control device 100 has a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an input / output circuit, which are not shown. The rotation restriction control device 100 controls the rotation restriction state of the restriction mechanism 10 on the basis of a program set in advance. The rotation restriction control device 100 has a determination section 110, a selection section 120, and a control section 130.

[0042] The determination section 110 determines the road surface on which the vehicle 1 is running, on the basis of the detection result of the gradient sensor 7. For example, in a case where the detection result of the gradient sensor 7 indicates an upward gradient, the determination section 110 determines that the road surface is an upward sloping surface. In a case where the detection result of the gradient sensor 7 indicates a downward gradient, the determination section 110 determines that the road surface is a downward sloping surface. In a case where the detection result of the gradient sensor 7 indicates neither an upward gradient nor a downward gradient, that is, indicates a flat surface, the determination section 110 determines that the road surface is a flat surface.

[0043] The selection section 120 selects the rotation restriction state of the restriction mechanism 10 on the basis of the determination result of the determination section 110, that is, the condition of the road surface on which the vehicle 1 is running.

[0044] Specifically, in the case where the road surface is a downward inclined surface, the selection section 120 selects a state in which only the rotation of the forward direction of the transmission 6 is restricted, i.e., the above-described first state.

[0045] In the case where the road surface is an upward inclined surface, the selection section 120 selects a state in which the rotation of the reverse direction of the transmission 6 is restricted, i.e., the above-described second state.

[0046] In the case where the road surface is a flat surface, the selection section 120 selects a state in which the rotation of the forward direction and the reverse direction of the transmission 6 is restricted, i.e., the above-described third state.

[0047] In the case where the vehicle 1 enters the parking state, the control section 130 controls the rotation restriction state of the restriction mechanism 10 in correspondence with the selection result of the selection section 120.

[0048] Specifically, the control section 130 recognizes whether or not the vehicle 1 is in the parking state on the basis of whether or not the parking signal output by the parking signal output section 8 is output. The control section 130 recognizes that the vehicle 1 is in the parking state in the case where the parking signal is continuously acquired, and recognizes that the vehicle 1 is not in the parking state in the case where the parking signal is not output.

[0049] The control section 130 recognizes that the vehicle 1 is to enter the parking state at the time when the acquisition of the parking signal is started, and in the case where the first state (the road surface is a downward inclined surface) is selected by the selection section 120, the control section 130 sets the rotation restriction state to the first state, i.e., the state in which only the rotation of the forward direction of the transmission 6 is restricted (refer to FIG. 2). Figure 2A ).

[0050] The control section 130 recognizes that the vehicle 1 is to enter the parking state at the time when the acquisition of the parking signal is started, and in the case where the second state (the road surface is an upward inclined surface) is selected by the selection section 120, the control section 130 sets the rotation restriction state to the second state, i.e., the state in which only the rotation of the reverse direction of the transmission 6 is restricted (refer to FIG. 3). Figure 2B ).

[0051] The control section 130 recognizes that the vehicle 1 is to enter the parking state at the time when the acquisition of the parking signal is started, and in the case where the third state (the road surface is a flat surface) is selected by the selection section 120, the control section 130 sets the rotation restriction state to the third state, i.e., the state in which the rotation of the forward direction and the reverse direction of the transmission 6 is restricted (refer to FIG. 4). Figure 2C ).

[0052] By so configuring, in the present embodiment, it is possible to change the rotation restriction state of the transmission 6 in accordance with the slope of the road surface. For example, when the vehicle 1 has entered the parked state on a downward sloping road surface, the vehicle 1 is in a state in which the rotation in the direction in which the vehicle 1 does not move due to its own weight, i.e., the backward direction, is not restricted, and the rotation in the direction in which the vehicle 1 moves due to its own weight, i.e., the forward direction, is restricted.

[0053] In addition, when the vehicle 1 has entered the parked state on an upward sloping road surface, the vehicle 1 is in a state in which the rotation in the direction in which the vehicle 1 does not move due to its own weight, i.e., the forward direction, is not restricted, and the rotation in the direction in which the vehicle 1 moves due to its own weight, i.e., the backward direction, is restricted.

[0054] That is, in the present embodiment, in accordance with the slope of the road surface on which the vehicle 1 has entered the parked state, the rotation of the transmission 6 is restricted in such a manner that only the direction that needs to be restricted is restricted, and thus it is possible to reduce the load applied to the rotation restriction device including the restriction mechanism 10 and the rotation restriction control device 100.

[0055] In addition, in a case where it is identified that the vehicle 1 is not in the parked state, the control portion 130 sets a state in which the rotation restriction state of the restriction mechanism 10 is released, i.e., the above-described restriction release state. Thereby, it is made possible for the vehicle 1 to travel in both the forward direction and the backward direction.

[0056] Next, an example of the operation of the rotation restriction control device 100 when the rotation restriction control is performed will be described. Figure 3 is a flowchart showing an example of the operation of the rotation restriction control device 100 when the rotation restriction control is performed. The processing of Figure 3 is appropriately performed when the vehicle 1 starts traveling, i.e., when the restriction mechanism 10 has entered the restriction release state.

[0057] As shown in Figure 3 , the rotation restriction control device 100 determines whether the parked state of the vehicle 1 is identified (step S101).

[0058] In a case where the result of the determination is that the parked state of the vehicle 1 is not identified (step S101: "No"), the processing of step S101 is repeated. On the other hand, in a case where the parked state of the vehicle 1 is identified (step S101: "Yes"), the rotation restriction control device 100 determines the road surface (step S102), and determines whether the determined road surface is a downward sloping road surface (step S103).

[0059] If the determination result is that the road surface is a downward sloping surface (step S103: "Yes"), the rotation restriction control device 100 selects the first state as the rotation restriction state and places the restriction mechanism 10 in the first state (step S104).

[0060] On the other hand, if the road surface is not a downward sloping surface (step S103: "No"), the rotation restriction control device 100 determines whether the road surface, which was determined in the latest step S101, is an upward sloping surface (step S105).

[0061] If the determination result is that the road surface is an upward sloping surface (step S105: "Yes"), the rotation restriction control device 100 selects the second state as the rotation restriction state and places the restriction mechanism 10 in the second state (step S106).

[0062] On the other hand, if the road surface is not sloping upwards, i.e., if the road surface is flat (step S105: "No"), the rotation restriction control device 100 selects the third state as the rotation restriction state and places the restriction mechanism 10 in the third state (step S107). After step S104, step S106 or step S107, this control ends.

[0063] Next, an example of the operation of the rotation restriction control device 100 when executing the control to release the rotation restriction will be described. Figure 4 This is a flowchart illustrating an example of the action performed by the rotation limit control device 100 when executing control to release the rotation limit. After executing... Figure 3 Following the illustrated process, when the limiting mechanism 10 enters any of the first, second, or third states, appropriate actions will be taken. Figure 4 The processing.

[0064] like Figure 4 As shown, the rotation restriction control device 100 determines whether the vehicle 1 has started driving (step S201). For example, when the lever is shifted to drive, the rotation restriction control device 100 determines that the vehicle 1 has started driving. If the determination result is that the vehicle 1 has not started driving (step S201: "No"), the process of step S201 is repeated. On the other hand, if the vehicle 1 has started driving (step S201: "Yes"), the rotation restriction control device 100 determines whether the vehicle 1 has started driving (step S202). If the determination result is that the vehicle 1 has not started driving (step S202: "No"), the process of step S202 is repeated.

[0065] On the other hand, when vehicle 1 has started moving (step S202: "Yes"), the rotation restriction control device 100 sets the state where the restriction of the restriction mechanism 10 has been released, i.e., the restriction release state (step S203). After step S203, this control ends.

[0066] According to this embodiment configured as described above, the rotation of the transmission 6 is restricted only in the direction that needs to be restricted, corresponding to the slope of the road surface when the vehicle 1 enters the parking state. Therefore, the load applied to the rotation restriction device, which includes the restriction mechanism 10 and the rotation restriction control device 100, can be reduced.

[0067] Parking mechanisms used to limit the rotation of the transmission when a vehicle is parked typically include parking gears or similar components to limit the rotation of the transmission itself.

[0068] However, when a vehicle stops on a slope, the parking mechanism needs to withstand a significant load to prevent it from rolling down due to its own weight. Therefore, the operation or action of disengaging the transmission when starting the vehicle from a slope requires overcoming the load applied to the parking mechanism. As a result, the operability of disengaging the parking brake in a typical parking mechanism may be affected.

[0069] In contrast, in this embodiment, the rotation of the transmission 6 is restricted only in the direction that needs to be restricted, so the vehicle can start driving without releasing the restriction mechanism 10. That is, the restriction mechanism 10 can be released after the load is released once the vehicle has started driving. As a result, the operability of releasing the parking brake is improved in this embodiment.

[0070] Furthermore, to prevent vehicles from sliding down slopes or other sloping surfaces due to their own weight, parking mechanisms are typically designed to be relatively large, ensuring the vehicle can reliably stop on such surfaces. Therefore, to install such a parking mechanism, space needs to be allocated around the transmission for its installation.

[0071] In contrast, in this embodiment, a restraining mechanism 10 consisting of two one-way clutches 11 and 12 is provided on the output shaft of the transmission 6, thus enabling the overall miniaturization of the parking-related mechanisms. As a result, there is no need to leave space around the transmission 6 for the restraining mechanism 10, and since the parking mechanism described above is not required, the number of components can be reduced.

[0072] Furthermore, when vehicle 1 is parked on a flat surface, the rotation of transmission 6 is restricted in both the forward and reverse directions, thus ensuring that vehicle 1 remains reliably stopped while parked. Additionally, on a flat surface, vehicle 1 does not need to bear the load of its own weight; therefore, even though the rotation of transmission 6 is restricted in both the forward and reverse directions, there are no operational issues when releasing the parking brake.

[0073] It should be noted that in the above embodiment, when the vehicle 1 is parked on a flat surface, the rotation of the transmission 6 is restricted in both the forward and reverse directions, but the present invention is not limited to this. For example, when the vehicle 1 is parked on a flat surface, the restriction mechanism 10 may be set to a restricted release state, and a different mechanism from the restriction mechanism 10 may be used to restrict the rotation of the transmission 6.

[0074] Examples of mechanisms different from the limiting mechanism 10 include, for example, a general parking mechanism as described above.

[0075] On a flat surface, unlike on a sloping road, vehicle 1 will not slide down due to its own weight. Therefore, it will not be subjected to the same load when parked as it would on a sloping road. Thus, even if the aforementioned parking mechanism is installed, its size can be relatively small, thereby minimizing its impact on the space around the transmission 6.

[0076] In addition, in the above embodiment, the limiting mechanism 10 is provided on the transmission shaft 2 (output shaft of the transmission 6), but the present invention is not limited to this, and may be provided on the upstream side of the differential gear 3, for example.

[0077] Furthermore, in the above embodiment, a one-way clutch mechanism with two selectable one-way clutches was exemplified as the limiting mechanism 10, but the present invention is not limited thereto. For example, a one-way clutch mechanism consisting of a single one-way clutch may also be used as the limiting mechanism, wherein the one-way clutch can be set to the following three rotation limiting states: a rotation limiting state that only restricts rotation in the forward direction, a rotation limiting state that only restricts rotation in the backward direction, and a rotation limiting state that restricts rotation in both the forward and backward directions.

[0078] In addition, in the above embodiment, the rotation restriction control device 100 is configured to include a judgment unit 110, a selection unit 120 and a control unit 130, but the present invention is not limited to this, and the judgment unit, selection unit and control unit may also be arranged separately.

[0079] In addition, in the above embodiment, the determination unit 110 determines the road surface. However, the present invention is not limited to this, and the road surface information can also be obtained from a device different from the rotation restriction control device.

[0080] It should be noted that the above embodiments are merely examples of specific implementations of the present invention, and the technical scope of the present invention should not be limited by these embodiments. That is, the present invention can be implemented in various forms without departing from its essential points or main features.

[0081] This application is based on Japanese patent application (Japan Patent Application No. 2020-098570) filed on June 5, 2020, the entire contents of which are incorporated herein by reference.

[0082] Industrial applicability

[0083] The rotation restriction control device of the present invention is useful as a rotation restriction control device, rotation restriction device and vehicle that can improve the operability when releasing the parking space.

[0084] Explanation of reference numerals in the attached figures

[0085] 1: Vehicle

[0086] 2: Drive shaft

[0087] 3: Differential gear

[0088] 4: Drive wheels

[0089] 5: Engine

[0090] 6: Transmission

[0091] 7: Slope sensor

[0092] 8: Parking signal output unit

[0093] 10: Restricted Institutions

[0094] 11: First one-way clutch

[0095] 12: Second one-way clutch

[0096] 100: Rotation limit control device

[0097] 110: Judgment Department

[0098] 120: Selection Department

[0099] 130: Control Department

Claims

1. A rotation limiting control device for a vehicle having a limiting mechanism, the limiting mechanism being capable of selecting a rotation limiting state from at least two states in a transmission, the two states including a first state that restricts rotation in the forward direction but not rotation in the reverse direction, and a second state that restricts rotation in the reverse direction but not rotation in the forward direction, the rotation limiting control device comprising: The selection unit selects the rotation restriction state based on the road surface on which the vehicle is traveling, specifically the road surface when the vehicle is in the parking state; and When the vehicle is in a parking state, the control unit controls the rotation restriction state of the restriction mechanism in accordance with the selection result of the selection unit. When the road surface is a downward sloping surface, the selection unit selects the first state. When the road surface is an upwardly sloping surface, the selection unit selects the second state.

2. The rotation limiting control device as described in claim 1, wherein, When the vehicle has started moving after shifting into forward gear, the rotation restriction control device is set to a restriction-released state where the restriction mechanism has been released.

3. The rotation limiting control device as described in claim 1, wherein, The limiting mechanism can select the rotation limiting state from the first state, the second state, and the third state, which restricts rotation in both the forward and reverse directions, in the transmission. When the road surface is flat, the selection unit selects the third state.

4. A rotation limiting device, comprising: A limiting mechanism, provided on the power transmission side of a transmission mounted in a vehicle, is capable of selecting a rotation limiting state from at least two states in the transmission, including a first state that restricts rotation in the forward direction but not in the reverse direction, and a second state that restricts rotation in the reverse direction but not in the forward direction; and The rotation limiting control device according to claim 1.

5. The rotation limiting device as claimed in claim 4, wherein, The limiting mechanism includes a one-way clutch mechanism that can select the rotation limiting state from at least two states, the first state and the second state. The one-way clutch mechanism includes a first one-way clutch and a second one-way clutch. The first one-way clutch is selectable between a first limiting state that restricts rotation in the forward direction of the vehicle and a first disengaged state that releases the first limiting state. The second one-way clutch is selectable between a second limiting state that restricts rotation in the reverse direction of the vehicle and a second disengaged state that releases the second limiting state. The first state is a state in which the first one-way clutch is in the first restricted state and the second one-way clutch is in the second released state. The second state is a state in which the first one-way clutch is in the first disengaged state and the second one-way clutch is in the second restricted state.

6. The rotation limiting device as claimed in claim 4, wherein, The limiting mechanism is located on the drive shaft, which receives power from the transmission.

7. A vehicle, comprising: Transmission; and The rotation limiting device according to claim 4.

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