JP2022052610A - Shift control device and shift control method - Google Patents

Abstract

To provide a shift control device capable of highly accurately switching a cycle in a detection angle, and a shift control method.SOLUTION: A shift control device comprises an acquisition unit and a switching unit. The acquisition unit acquires a detection angle to which a plurality of cycles are allocated with respect to one cycle of a real rotation angle in an engage member for switching a shift stage of a transmission. The switching unit switches a cycle in the plurality of cycles on the basis of the detection angle acquired by the acquisition unit. When switching from a present cycle to the next cycle, in a case where the detection angle exceeds an angle range from a start angle of the next cycle to a predetermined angle threshold, the switching unit switches to the next cycle.SELECTED DRAWING: Figure 4

Description

The present invention relates to a shift control device and a shift control method.

Conventionally, there is known a shift control device that controls a transmission that switches gears by engaging a meshing clutch (so-called dog clutch) and a gear. In such a shift control device, the actual rotation angles of the dog clutch and the gear are calculated from the detection angles detected by a sensor such as a resolver. Specifically, by assigning a detection angle of a plurality of cycles to one cycle of the actual rotation angle, the actual rotation angle is calculated from the current cycle and the detection angle (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2010-20472

However, in the prior art, the cycle is switched when the detection angle changes from 359 degrees to 0 degrees (crossing the angle), but in such a prior art, there is a possibility that the cycle cannot be switched with high accuracy.

For example, if the detection angle temporarily changes due to disturbance or the like before and after the cycle is switched (for example, 0 degree or 359 degrees), the current cycle is erroneous because the angle straddle becomes multiple times in a short time. There was a risk of recognizing it.

The present invention has been made in view of the above, and an object of the present invention is to provide a shift control device and a shift control method capable of switching a cycle at a detection angle with high accuracy.

In order to solve the above-mentioned problems and achieve the object, the shift control device according to the present invention includes an acquisition unit and a switching unit. The acquisition unit acquires a detection angle to which a plurality of cycles are assigned to one cycle of the actual rotation angle of the engaging member that switches the shift stage of the transmission. The switching unit switches the period in the plurality of cycles based on the detection angle acquired by the acquisition unit. When switching from the current cycle to the next cycle, the switching unit shifts to the next cycle when the detection angle exceeds the angle range from the start angle of the next cycle to a predetermined angle threshold value. Switch.

According to the present invention, it is possible to switch the period at the detection angle with high accuracy.

FIG. 1 is a schematic diagram showing an outline of a transmission according to an embodiment. FIG. 2 is a diagram showing an outline of a shift control method according to an embodiment. FIG. 3 is a diagram showing an outline of a shift control method according to an embodiment. FIG. 4 is a block diagram showing a configuration example of the shift control device according to the embodiment. FIG. 5 is a diagram showing a method of setting an angle threshold value by the setting unit. FIG. 6 is a flowchart showing a processing procedure of processing executed by the shift control device according to the embodiment.

Hereinafter, embodiments of the shift control device and the shift control method disclosed in the present application will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments shown below.

First, the outline of the shift control method according to the embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a schematic diagram showing an outline of a transmission according to an embodiment. 2 and 3 are diagrams showing an outline of the shift control method according to the embodiment.

The transmission 1 shown in FIG. 1 is provided in a vehicle and is configured to be switchable between a plurality of transmission stages. In FIG. 1, a transmission 1 having four forward gears is described as an example, but for example, a reverse gear may be further provided.

As shown in FIG. 1, the transmission 1 includes an input shaft 2, an output shaft 3, a shift mechanism 4, and a shift control device 5.

The input shaft 2 is connected to an output shaft of a power source such as an engine or a motor. The input shaft 2 is rotatably supported by a transmission cover or the like via bearings. The input shaft 2 is provided with an input gear 10 and a dog clutch 20 as engaging members. The input gear 10 includes a first input gear 11, a second input gear 12, a third input gear 13, and a fourth input gear 14. The dog clutch 20 includes a first dog clutch 21 and a second dog clutch 22.

The output shaft 3 is connected to the drive wheels via a differential mechanism or the like. The output shaft 3 is rotatably supported by a transmission cover or the like via bearings. The output shaft 3 is provided with an output gear 30. The output gear 30 includes a first output gear 31, a second output gear 32, a third output gear 33, and a fourth output gear 34.

The first input gear 11 to the fourth input gear 14 are provided so as to be rotatable relative to the input shaft 2. The first output gear 31 to the fourth output gear 34 are supported so as not to rotate relative to the output shaft 3. That is, the first output gear 31 to the fourth output gear 34 are integrated with the output shaft 3 and rotate.

The first output gear 31 meshes with the first input gear 11. The second output gear 32 meshes with the second input gear 12. The third output gear 33 meshes with the third input gear 13. The fourth output gear 34 meshes with the fourth input gear 14.

Therefore, the first input gear 11 to the fourth input gear 14 rotate together with the first output gear 31 to the fourth output gear 34, that is, the output shaft 3.

The shift mechanism 4 includes a first dog clutch 21, a second dog clutch 22, a shift barrel 40, a first shift fork 41, a second shift fork 42, and an actuator 43.

The first dog clutch 21 is provided so as not to rotate relative to the input shaft 2. The first dog clutch 21 can move along the axial direction of the input shaft 2 according to the rotation of the shift barrel 40. The second dog clutch 22 is provided so as not to rotate relative to the input shaft 2. The second dog clutch 22 can move along the axial direction of the input shaft 2 according to the rotation of the shift barrel 40.

The shift barrel 40 is rotated by the actuator 43. A plurality of shift grooves 40a and 40b are formed in the shift barrel 40. Specifically, two shift grooves 40a and 40b are formed in the shift barrel 40. The two shift grooves 40a and 40b are formed so that the first shift fork 41 and the second shift fork 42 are moved along the axial direction of the input shaft 2 by the rotation of the shift barrel 40.

That is, the shift barrel 40 moves the first shift fork 41 and the second shift fork 42 along the axial direction of the input shaft 2 by the two shift grooves 40a and 40b, whereby the first dog clutch 21 and the second shift fork 42 are moved. The dog clutch 22 is moved along the axial direction of the input shaft 2.

The actuator 43 is an operating device that operates the dog clutch 20 via the shift barrel 40 and the first shift fork 41 or the second shift fork 42. The actuator 43 is, for example, a hydraulic actuator whose hydraulic pressure is controlled by a solenoid to rotate the shift barrel 40. The actuator 43 may be an electric motor.

When the shift barrel 40 is rotated by the actuator 43, the dog clutch 20 moves via the first shift fork 41 and the second shift fork 42. As a result, the engagement state between the dog clutch 20 and the input gear 10 is switched, and the shift stage is switched.

For example, when the first dog clutch 21 meshes with (engages) the first input gear 11, the rotation of the input shaft 2 causes the first dog clutch 21, the first input gear 11, the first output gear 31, and the output shaft 3 to rotate. It is transmitted in the order of.

When the dog clutch 20 and the input gear 10 are engaged, the operation timing of the dog clutch 20 is controlled so that the meshing teeth of the dog clutch 20 and the meshing teeth of the input gear 10 do not interfere with each other.

Further, rotation sensors 70 and 71 are provided on the input shaft 2 and the output shaft 3, respectively. The rotation sensors 70 and 71 are, for example, resolvers. The rotation sensor 70 detects the rotation angle of the input shaft 2, and the rotation sensor 71 detects the rotation angle of the output shaft 3.

That is, the rotation sensor 70 detects the rotation angle (detection angle) of the dog clutch 20 by detecting the rotation angle of the input shaft 2. Further, the rotation sensor 71 detects the rotation angle (detection angle) of the output gear 30 and the input gear 10 by detecting the rotation angle of the output shaft 3.

By executing the shift control method according to the embodiment, the shift control device 5 determines the operation timing of the dog clutch 20 based on the rotation angle and rotation speed of the dog clutch 20, the rotation angle of the input gear 10, and the rotation speed. Controlled to engage the dog clutch 20 and the input gear 10.

Here, the outline of the shift control method according to the embodiment will be described with reference to FIGS. 2 and 3. 2 and 3 show graphs in which the horizontal axis is time and the vertical axis is the detection angle or the actual angle of rotation. In the shift control method, the actual rotation angle is calculated from the detection angle and the current cycle. Further, the detection angle may be read as an electric angle, and the actual rotation angle may be read as a mechanical angle.

Here, as shown in FIG. 2, in the present disclosure, two cycles of the detection angle are assigned to one cycle (0 degrees to 360 degrees) of the actual rotation angle of the engaging member. That is, in the present disclosure, when the actual rotation angle is 180 degrees, the period of the detection angle is switched from the first cycle to the second cycle.

Not limited to the case where two cycles of the detection angle are assigned to one cycle of the actual rotation angle, an integral multiple of three or more cycles of the detection angle may be assigned to one cycle of the actual rotation angle. For example, when four cycles of the detection angle are assigned, the cycle of the detection angle is switched every 90 degrees of the actual rotation angle.

Here, as shown in FIG. 3, the detection angle may temporarily move back and forth due to disturbance or the like. Specifically, it is assumed that the detection angle gradually increases from time t11 to t12, and the detection angle reaches 360 degrees at time t12, that is, returns to 0 degrees. Then, at time t13 immediately after that, if the detection angle returns to 359 degrees due to disturbance, for example, at the next time t14, the detection angle reaches 360 degrees again, that is, returns to 0 degrees. Will be.

That is, in FIG. 3, the angle straddle (359 degrees → 0 degrees), which is the transition of the cycle, occurs twice in a short time (time t12 and time t14) due to the disturbance.

Here, in the prior art, the occurrence of an angle straddle is used as a trigger for switching the cycle. That is, when FIG. 3 is taken as an example, in the prior art, the cycle is switched between the time t12 and the time t14, so that the current cycle is erroneously recognized.

As a result, in the prior art, the accuracy of the actual rotation angle is lowered by calculating the actual rotation angle at an erroneous cycle, and there is a possibility that the meshing teeth may come into contact with each other and be damaged when the dog clutch and the input gear are engaged. there were.

Therefore, in the shift control method according to the embodiment, the angle range that straddles the angle is set as the hiss region so that the cycle is not switched within the angle range where the detection angle is applied.

Specifically, in the shift control method according to the embodiment, when the detection angle exceeds the angle range from the start angle of the next cycle to the predetermined angle threshold value TH when switching from the current cycle to the next cycle. , Switch to the next cycle.

Taking FIG. 3 as an example, in the shift control method, the current cycle (first cycle) is maintained without switching the cycle at the time t12 that straddles the angle, and the detection angle exceeds the angle threshold value TH. At time t15, the cycle is switched to the next cycle (second cycle).

At time t13, it seems that the angle threshold value TH is exceeded in terms of the representation in the drawing, but this is because the detection angle has returned (for example, 363 degrees (3 degrees in the second cycle) → 359 degrees). Since it indicates that, it does not exceed the angle threshold value TH.

As a result, even if the angle straddle occurs a plurality of times in a short time due to a disturbance or the like, the cycle can be prevented from being switched, so that it is possible to reduce the false recognition of the current cycle. That is, according to the shift control method according to the embodiment, it is possible to switch the cycle at the detection angle with high accuracy.

As a result, since the accuracy of the actual rotation angle is improved, it is possible to reduce the possibility that the meshing teeth come into contact with each other and are damaged when the dog clutch 20 and the input gear 10 are engaged.

Next, a configuration example of the shift control device 5 according to the embodiment will be described with reference to FIG. FIG. 4 is a block diagram showing a configuration example of the shift control device 5 according to the embodiment. The shift control device 5 shown in FIG. 4 is connected to the rotation sensor 70, the rotation sensor 71, and the actuator 43. Further, as shown in FIG. 4, the shift control device 5 includes a control unit 51 and a storage unit 52.

Here, the shift control device 5 includes, for example, a computer having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a flash memory, an input / output port, and various circuits.

The CPU of the computer functions as the acquisition unit 510, the switching unit 511, the setting unit 512, and the speed change unit 513 of the control unit 51 by reading and executing the program stored in the ROM, for example.

Further, at least one or all of the acquisition unit 510, the switching unit 511, the setting unit 512, and the speed change unit 513 may be configured by hardware such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). can.

Further, the storage unit 52 corresponds to RAM and flash memory. The RAM and the flash memory can store information of various programs and the like. The shift control device 5 may acquire the above-mentioned program and various information via another computer or a portable recording medium connected by a wired or wireless network.

Next, each function of the control unit 51 (acquisition unit 510, switching unit 511, setting unit 512, and speed change unit 513) will be described in detail.

The acquisition unit 510 acquires the detection angles of the dog clutch 20 and the input gear 10, which are engaging members, based on the information detected by the rotation sensors 70 and 71. Specifically, the acquisition unit 510 acquires the detection angles at regular intervals in the range of 1 degree to 360 degrees (0 degrees).

The switching unit 511 switches the period in a plurality of cycles based on the detection angle acquired by the acquisition unit 510. Specifically, the switching unit 511 shifts to the next cycle when the detection angle exceeds the angle range from the start angle of the next cycle to the predetermined angle threshold value when switching from the current cycle to the next cycle. Switch. The angle range defined by the angle threshold value is also referred to as a dead zone or a hysteresis region (his region).

The switching unit 511 may perform the above-mentioned switching process on at least one of the dog clutch 20 and the input gear 10 which are engaging members. That is, the switching unit 511 performs a switching process for switching the cycle of at least one of the dog clutch 20 and the input gear 10 when the detection angle exceeds the angular range. Then, the switching unit 511 switches the cycle of the remaining other when the detection angle straddles the angle. Since the dog clutch 20 is more susceptible to disturbance than the input gear 10, it is preferable to give priority to the dog clutch 20 and perform the above-mentioned switching process.

The setting unit 512 sets the angle threshold value used for the switching process of the switching unit 511. Specifically, the setting unit 512 sets an angle threshold value according to the rotation speed of the engaging member. The rotation speed can be calculated based on the change in the detection angle acquired by the acquisition unit 510 and the change in the actual rotation angle calculated by the speed change unit 513 described later.

Here, a method of setting the angle threshold value by the setting unit 512 will be described with reference to FIG. FIG. 5 is a diagram showing a method of setting an angle threshold value by the setting unit 512.

As shown in FIG. 5, the setting unit 512 sets the final angle threshold value by increasing or decreasing the reference angle threshold value TH according to the rotation speed of the engaging member.

Specifically, the setting unit 512 sets an angle threshold value THa higher than the reference angle threshold value TH when the rotation speed of the engaging member is low. On the other hand, when the rotation speed of the engaging member is high, the setting unit 512 sets an angle threshold value THb lower than the reference angle threshold value TH.

That is, the setting unit 512 sets the angle threshold value so that the angle range becomes wider as the rotation speed of the engaging member becomes slower. This is because the slower the rotation speed of the engaging member, the easier it is for the detection angle to move back and forth under the influence of disturbance. By using the angle threshold value set in this way, the cycle switching accuracy by the switching unit 511 can be improved.

In the example shown in FIG. 5, only the two cases of low speed and high speed are shown, but for example, the angle threshold value may be gradually increased or decreased according to the rotation speed of the engaging member. Further, for example, when it is known in advance that the rotational speed of the engaging member is susceptible to disturbance at a specific speed, the angle threshold value at the specific speed may be set to be the highest. ..

In this way, the setting unit 512 can improve the cycle switching accuracy by the switching unit 511 by setting the angle threshold value according to the rotation speed of the engaging member.

Further, as shown in the lower part of FIG. 5, the setting unit 512 sets the angle threshold value THb so that the angle range becomes zero at high speed, that is, when the rotation speed is equal to or higher than a predetermined threshold value. This is because if the rotation speed is high, it is not easily affected by disturbance. As a result, the setting unit 512 can switch the cycle at the timing of straddling the angle, so that the cycle can be switched at an accurate timing.

Returning to FIG. 4, the transmission unit 513 will be described. When the shift unit 513 receives a shift request for changing the shift stage, the shift unit 513 drives the actuator 43 to switch the shift stage. Specifically, the speed change unit 513 rotates the shift barrel 40 to engage the dog clutch 20 and the input gear 10 which are engaging members by instructing the solenoid of the actuator 43 with a current.

More specifically, the speed change unit 513 calculates the actual rotation angle based on the cycle after switching by the switching unit 511 and the detection angle acquired by the acquisition unit 510. For example, the speed change unit 513 calculates the actual rotation angle as 270 degrees when the detection angle is 90 degrees in the second cycle at present.

Then, using the calculated actual rotation angle, the speed change unit 513 issues a current instruction to the actuator 43 so that the meshing teeth of the dog clutch 20 and the input gear 10 are engaged at a timing that does not interfere with each other.

In this way, the speed change section 513 can calculate the actual rotation angle with high accuracy based on the cycle switched by the switching section 511 using the angle threshold value, so that the meshing teeth of the dog clutch 20 and the input gear 10 come into contact with each other and are damaged. Can be reduced. That is, the speed change unit 513 can switch the shift stage with high accuracy.

Next, the procedure of the process executed in the shift control device 5 according to the embodiment will be described with reference to FIG. FIG. 6 is a flowchart showing a processing procedure of processing executed by the shift control device 5 according to the embodiment.

As shown in FIG. 6, the acquisition unit 510 first acquires the detection angle of the engaging member based on the information detected by the rotation sensors 70 and 71 (step S101).

Subsequently, the setting unit 512 sets an angle threshold value according to the rotation speed of the engaging member (step S102).

Subsequently, the switching unit 511 determines whether or not the detection angle is equal to or less than the angle threshold value (step S103). When the detection angle is equal to or less than the angle threshold value (step S103: Yes), the switching unit 511 maintains the current cycle (step S104) and ends the process.

On the other hand, when the detection angle is not equal to or less than the angle threshold value (step S103: No), the switching unit 511 determines whether or not the detection angle has just exceeded the angle threshold value (step S105). Immediately after the excess, it means the timing when the detection angle crosses the angle threshold value.

When the detection angle immediately exceeds the angle threshold value (step S105: Yes), the switching unit 511 switches to the next cycle (step S106), and ends the process.

On the other hand, the switching unit 511 maintains the current cycle when the detection angle is not immediately after exceeding the angle threshold value (step S105: No), that is, when the detection angle is at a position significantly outside the angle range (step S104). , End the process.

As described above, the shift control device 5 according to the embodiment includes an acquisition unit 510 and a switching unit 511. The acquisition unit 510 acquires a detection angle to which a plurality of cycles are assigned to one cycle of the actual rotation angle of the engaging member for switching the shift stage of the transmission 1. The switching unit 511 switches the period in a plurality of cycles based on the detection angle acquired by the acquisition unit 510. When switching from the current cycle to the next cycle, the switching unit 511 switches to the next cycle when the detection angle exceeds the angle range from the start angle of the next cycle to the predetermined angle threshold value. This makes it possible to switch the period at the detection angle with high accuracy.

Further effects and variations can be easily derived by those skilled in the art. For this reason, the broader aspects of the invention are not limited to the particular details and representative embodiments described and described above. Thus, various modifications can be made without departing from the spirit or scope of the overall concept of the invention as defined by the appended claims and their equivalents.

1 Transmission 2 Input shaft 3 Output shaft 4 Shift mechanism 5 Shift control device 10 Input gear 11 1st input gear 12 2nd input gear 13 3rd input gear 14 4th input gear 20 Dog clutch 21 1st dog clutch 22 2nd dog clutch 30 Output gear 31 1st output gear 32 2nd output gear 33 3rd output gear 34 4th output gear 40 Shift barrel 40a Shift groove 40b Shift groove 41 1st shift fork 42 2nd shift fork 43 Actuator 51 Control unit 52 Storage unit 70 , 71 Rotation sensor 510 Acquisition unit 511 Switching unit 512 Setting unit 513 Speed change unit

Claims (7)

An acquisition unit that acquires a detection angle to which multiple cycles are assigned to one cycle of the actual rotation angle of the engaging member that switches the shift stage of the transmission, and
A switching unit for switching a cycle in the plurality of cycles based on the detection angle acquired by the acquisition unit is provided.
The switching unit is
The feature is that when switching from the current cycle to the next cycle, when the detection angle exceeds the angle range from the start angle of the next cycle to a predetermined angle threshold value, the cycle is switched to the next cycle. Shift control device. The shift control device according to claim 1, further comprising a setting unit for setting the angle threshold value according to the rotation speed of the engaging member. The setting unit is
The shift control device according to claim 2, wherein the angle threshold value is set so that the slower the rotation speed, the wider the angle range. The setting unit is
The shift control device according to claim 2 or 3, wherein when the rotation speed is equal to or higher than a predetermined threshold value, the angle threshold value is set so that the angle range becomes zero. By engaging the engaging member using the actual rotation angle calculated based on the cycle after switching by the switching unit and the detection angle acquired by the acquisition unit, the transmission unit that switches the shift stage can be obtained. The shift control device according to any one of claims 1 to 4, further comprising. The engaging member is
Including the dog clutch and the gear that engages with the dog clutch.
The switching unit is
The shift control according to any one of claims 1 to 5, wherein the dog clutch and at least one of the gears are subjected to a switching process for switching the cycle when the detection angle exceeds the angle range. Device. The acquisition process of acquiring the detection angle to which multiple cycles are assigned to one cycle of the actual rotation angle of the engaging member that switches the shift stage of the transmission, and the acquisition process.
A switching step of switching a cycle in the plurality of cycles based on the detection angle acquired by the acquisition step is included.
The switching step is
The feature is that when switching from the current cycle to the next cycle, when the detection angle exceeds the angle range from the start angle of the next cycle to a predetermined angle threshold value, the cycle is switched to the next cycle. Shift control method.

Images