KR20230101455A - Transmission for vehicle - Google Patents

Abstract

The present invention relates to a vehicle shift device, and more particularly, to a vehicle shift device that stores operation parameters of an actuator for changing a shift stage of a transmission by learning, and changes the shift stage of the transmission according to the stored operation parameters.
A vehicle transmission according to an embodiment of the present invention includes a transmission, a detent plate provided in the transmission and having a plurality of detent grooves corresponding to shift stages of the transmission, provided in the transmission, and a locking portion inserted into a selected detent groove and pressurizing the detent plate, and an actuator rotating the detent plate so that the shift stage of the transmission is switched to a target shift stage corresponding to a shift stage change command; , a first sensing unit for detecting the rotational position of the detent plate, a second sensing unit for detecting the rotational position of the actuator, and the hooking unit at a plurality of different learning points for each of the plurality of detent grooves and a control device configured to set a target rotational position of the actuator for each shift stage based on a detection result of the first sensing unit and the second sensing unit at the time of positioning, and to control the actuator according to the set target rotational position.

Description

Transmission for vehicle {Transmission for vehicle}

The present invention relates to a vehicle transmission, and more particularly, to a vehicle transmission for storing operation parameters of an actuator for changing a shift stage of a transmission by learning and switching a shift stage of a transmission according to the stored operation parameters. will be.

The shifting device may change the gear ratio to keep the rotation of the engine constant according to the speed of the vehicle, and the driver manipulates the shift lever to change the gear ratio of the transmission.

The shift modes of the transmission include a manual shift mode in which the driver can change the gear range and an automatic shift mode in which the gear range is automatically changed according to the vehicle speed when the driver selects the driving range D.

In addition, a sports mode type shifting device capable of performing manual shifting and automatic shifting in one shifting device is being used. A sports mode type transmission may include a transmission capable of manual shifting next to a transmission that automatically shifts so that a driver can perform manual shifting by increasing or lowering a gear while performing automatic shifting by default. there is.

The shift lever is exposed inside the vehicle so that the driver can manipulate it, and most of the shift lever is exposed between the center fascia and the console box of the vehicle.

In general, since a driver selects a shift stage by moving a shift lever, a space is required along the movement trajectory of the shift lever, so it is required to design the shift lever to prevent interference with surroundings. Accordingly, recently, a dial-type or button-type shift operation is possible, thereby reducing a space required for a shift operation, thereby increasing space utilization of a vehicle and improving shift operation.

According to the dial method or the button type method, a shift signal corresponding to a shift stage selected by a user is transmitted to the actuator, and the actuator operates in response to the shift signal to change the shift stage of the transmission. Meanwhile, an operation of the actuator may not coincide with an operation of the transmission due to an error that may occur in a mechanical connection structure between the actuator and the transmission. For example, the actuator accurately moves to the parking level, but the transmission operated by the actuator may not accurately switch to the parking level.

Accordingly, there is a need for an invention to reduce an operating error that may occur between an actuator for shifting a shift stage and a transmission.

Japanese Patent Registration No. 6859106 (2021.03.29)

An object to be solved by the present invention is to provide a vehicle shift device that stores operation parameters of an actuator for changing a shift stage of a transmission by learning and changes the shift stage of a transmission according to the stored operation parameters.

The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the following description.

A vehicle transmission according to an embodiment of the present invention includes a transmission, a detent plate provided in the transmission and having a plurality of detent grooves corresponding to shift stages of the transmission, provided in the transmission, and a locking portion inserted into a selected detent groove and pressurizing the detent plate, and an actuator rotating the detent plate so that the shift stage of the transmission is switched to a target shift stage corresponding to a shift stage change command; , a first sensing unit for detecting the rotational position of the detent plate, a second sensing unit for detecting the rotational position of the actuator, and the hooking unit at a plurality of different learning points for each of the plurality of detent grooves and a control device configured to set a target rotational position of the actuator for each shift stage based on a detection result of the first sensing unit and the second sensing unit at the time of positioning, and to control the actuator according to the set target rotational position.

An elastic part providing an elastic force to the hooking part may further be included, and the actuator rotates the detent plate by providing a rotational force greater than the elastic force to the detent plate.

The control device sets a target point corresponding to a corresponding shift stage for each of the plurality of detent grooves, sets a shift learning range extended by a predetermined distance from the target point to both sides, and mutually recognizes each other on the shift learning range. A target rotational position of the actuator corresponding to each shift stage is set based on a trend of a detection result of the second sensing unit with respect to a sensing result of the first sensing unit when the engaging part is located at another plurality of learning points.

The target point includes the lowest point of the corresponding detent groove.

A distance between the shift learning boundary extending from the target point to one side and the target point is equal to or different from a distance between the shift learning boundary extending from the target point to the other side and the target point.

The plurality of different learning points are arranged at equal intervals.

The control device derives the trend using the least squares method.

A plurality of different learning points at which the hooking portion is located represent points determined according to a rotational position of the detent plate.

Details of other embodiments are included in the detailed description and drawings.

As described above, according to the vehicle shift device according to an embodiment of the present invention, operation parameters of an actuator for changing a shift stage of a transmission are stored by learning, and shift stages of the transmission are changed according to the stored operation parameters. There is an advantage in reducing an operation error that may occur between the actuator for switching and the transmission.

1 is a block diagram of a vehicle transmission according to an embodiment of the present invention.
2 is a view showing a detent part.
3 is a view showing movement of the hooking unit between different detent grooves.
4 is a diagram for explaining that a shift learning range is set.
5 is a diagram for explaining that a learning point is set on a shift learning range.
6 is a diagram showing corresponding points displayed on a graph plane.
7 is a diagram showing a trend graph.
8 is a diagram for explaining that a target rotational position is set using a trend graph.
9 is a diagram showing a target rotation position table.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms, only the present embodiments make the disclosure of the present invention complete, and the common knowledge in the art to which the present invention belongs It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used in a meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined.

1 is a block diagram of a vehicle transmission according to an embodiment of the present invention, and FIG. 2 is a view showing a detent part.

Referring to FIG. 1 , a vehicle transmission 10 according to an embodiment of the present invention includes a transmission 100, a first sensing unit 210, a second sensing unit 220, an actuator 300, and a control device 400. ) is composed of.

The transmission 100 may determine a shift stage between an engine and wheels of a vehicle. In the present invention, the shift range of the transmission 100 may include a parking range (P range), a reverse range (R range), a neutral range (N range), and a driving range (D range). For example, the shift stages may be formed in the order of a parking stage (P range), a reverse gear (R range), a neutral range (N range), and a driving range (D range).

The first sensor 210 may detect a shift stage of the transmission 100 . For example, the first detecting unit 210 determines whether the shift stage of the transmission 100 is a parking range (P range), a reverse gear (R range), a neutral range (N range), and a driving range (D range). can detect A detection result of the first detector 210 may be transmitted to the control device 400 .

The first sensing unit 210 may be provided in the form of an inhibitor switch, but the first sensing unit 210 of the present invention is not limited to an inhibitor switch.

The transmission 100 may include a detent unit 110 . The detent unit 110 serves to maintain the selected shift stage. For example, when a specific level of external force does not act in a state in which a specific shift range is selected, the corresponding shift range is maintained by the detent unit 110 and is not switched to another shift range.

Referring to FIG. 2 , the detent unit 110 includes a detent plate 111 and a pressure providing unit 112 .

The detent plate 111 is provided in the transmission 100 and may include a plurality of detent grooves 111a, 111b, 111c, and 111d corresponding to shift stages of the transmission 100. The detent plate 111 may rotate based on the axis of rotation Ax. When a specific shift stage is selected, the detent plate 111 may rotate to a position corresponding to the corresponding shift stage.

The pressure providing unit 112 may provide pressure to the detent plate 111 . The pressure providing part 112 may include a hooking part 112a and an elastic part 112b. The locking portion 112a is provided in the transmission 100 and is inserted into a selected detent groove among the plurality of detent grooves 111a to 111d to press the detent plate 111 . The elastic part 112b may provide elastic force to the hooking part 112a. For example, the elastic part 112b may be provided in the form of a leaf spring.

As the locking portion 112a is inserted into a specific detent groove by the elastic force of the elastic portion 112b, pressure is applied to the detent plate 111, and the rotational position of the detent plate 111 may be fixed. As the rotational position of the detent plate 111 is fixed, the corresponding gear shift range is maintained and switching to another gear range can be prevented.

The above-described first sensor 210 may detect a shift stage of the transmission 100 by referring to the rotational position of the detent plate 111 . The first detector 210 can detect the rotational position of the detent plate 111, and when the detected rotational position is included in the range of a specific shift range of the transmission 100, it can detect that the corresponding shift range is reached. It can.

Referring back to FIG. 1 , the actuator 300 serves to rotate the detent plate 111 so that the shift range of the transmission 100 is switched to a target shift range corresponding to the shift range change command.

The user may input a shift stage change command for changing the shift stage of the transmission 100 using a shift stage change unit (not shown) such as a shift lever, a shift button, or a shift dial provided in the vehicle. The actuator 300 rotates the detent plate 111 according to the shift stage change command, and the shift stage of the transmission 100 may be switched from a current shift stage to a target shift stage.

The actuator 300 may rotate the detent plate 111 by providing rotational force to the detent plate 111 that is greater than the elastic force of the elastic portion 112b. When the detent plate 111 rotates with a rotation force greater than the elastic force of the elastic part 112b in a state in which the detent plate 111 is pressed by the detent plate 112a, the detent plate 112a moves between adjacent detent grooves. can For example, the engaging part 112a can move from the detent groove corresponding to the neutral end to the detent groove corresponding to the reverse end.

While moving between adjacent detent grooves, the hooking portion 112a may continuously press the detent plate 111 . For example, the hooking portion 112a may be provided in a form in which an end of the elastic portion 112b is wound round. In this case, the hooking portion 112a may move between the detent grooves while maintaining contact with the surface of the detent plate 111 .

The second sensor 220 may detect the rotational position of the actuator 300 . A plurality of rotational positions of the actuator 300 at which the hooking part 112a is located at a plurality of different learning points described later may indicate rotational positions detected by the second sensing unit 220 . A detection result of the second sensor 220 may be transmitted to the control device 400 .

The control device 400 may control the actuator 300 . For example, the control device 400 may receive a shift stage change command from the shift stage change unit and control the actuator 300 according to the received shift stage change command. While the detent plate 111 is rotated by the rotational force of the actuator 300, the locking portion 112a may move between the detent grooves and be inserted into the detent groove corresponding to the target shift stage.

In the present invention, the control device 400 may be an electronic control unit (ECU) provided in a vehicle or may include an ECU.

3 is a view showing movement of the hooking unit between different detent grooves.

Referring to FIG. 3 , the hooking portion 112a may move between different detent grooves 111a to 111d.

The rotation of the detent plate 111 may cause the relative movement of the engaging portion 112a with respect to the detent plate 111 . 3 shows that the hooking part 112a moves from the detent groove 111a of the parking stage to the detent groove 111c of the neutral stage.

The detent plate 111 may have a rotational position for each shift stage. When the target shift range is selected, the detent plate 111 should rotate to a position corresponding to the corresponding shift range. When the detent plate 111 has a posture out of position corresponding to the target shift stage, shifting of the transmission 100 may not be normally performed.

Allowable shift ranges (rg1, rg2, rg3, rg4) may be set for each shift stage. When the engaging portion 112a is included in the allowable shift range rg1 to rg4, it may be determined that the gear shift range of the transmission 100 is normally switched to the target gear range. When the detent plate 111 is rotated to a position corresponding to the target shift stage, the locking portion 112a may be included in the allowable shift range rg1 to rg4.

As described above, the actuator 300 may rotate the detent plate 111 . The first sensor 210 may detect the rotational position of the detent plate 111 and transmit the detected rotational position to the control device 400 . Meanwhile, since it takes a certain amount of time to receive the detection result of the first detection unit 210, the control device 400 controls the operation of the actuator 300 based on the detection result of the first detection unit 210. It can be hard to follow. For example, in a state in which the detent plate 111 is rotated to be accurately positioned at a specific shift stage, the first sensing unit 210 may transmit the rotational position of the detent plate 111 to the control device 400 . At a time when the operation of the actuator 300 is to be controlled after receiving the detection result of the first detector 210, the detent plate 111 may be out of the range of the corresponding shift stage.

Therefore, it is preferable to control the operation of the actuator 300 so that the detent plate 111 is accurately positioned at each gear shift regardless of the detection result of the first detector 210 .

In the present invention, the control device 400 sets the rotational position of the actuator 300 to rotate the detent plate 111 in advance to the rotational position corresponding to the shift stage, and according to the rotational position of the actuator 300 set The actuator 300 can be controlled. Specifically, the control device 400 is configured to perform a first operation when the hooking part 112a is positioned at a plurality of different learning points for each of the plurality of detent grooves 111a to 111d provided in the detent plate 111. Based on the detection results of the sensing unit 210 and the second sensing unit 220, a target rotational position of the actuator 300 for each shift stage may be set, and the actuator 300 may be controlled according to the set target rotational position.

Hereinafter, a process of setting a target rotational position of the actuator 300 will be described with reference to FIGS. 4 to 8 .

4 is a diagram for explaining that a shift learning range is set, FIG. 5 is a diagram for explaining that a learning point is set on a shift learning range, and FIG. 6 is a diagram showing corresponding points displayed on a graph plane. 7 is a view showing a trend graph, FIG. 8 is a view for explaining that a target rotation position is set using the trend graph, and FIG. 9 is a view showing a target rotation position table.

Referring to FIG. 4 , the control device 400 may set a shift learning range TLR for each of the plurality of detent grooves 111a to 111d.

In order to set the shift learning range TLR, the control device 400 may first set a target point TP corresponding to a corresponding shift stage. The target point TP may be the lowest point of the corresponding detent grooves 111a to 111d.

Subsequently, the control device 400 may set a shift learning range TLR extended by a predetermined distance from the target point TP to both sides. The shift learning range TLR may be a range spaced apart by a predetermined distance on both sides corresponding to the moving direction of the engaging portion 112a. Here, the distance between the shift learning boundary (hereinafter referred to as a first shift learning boundary) BD1 extended from the target point TP to one side and the target point TP is the shift learning boundary extended from the target point TP to the other side. It may be the same as or different from the distance between (hereinafter, referred to as a second shift learning boundary) BD2 and the target point TP. For example, in order to learn the rotational position of the actuator 300, the shift learning boundary into which the engaging part 112a enters is the first shift learning boundary BD1, and the shift learning boundary into which the engaging part 112a advances is It may be the second shift learning boundary BD2.

The control device 400 determines the level of the second sensing unit 220 for the detection result of the first sensing unit 210 when the engaging part 112a is located at a plurality of different learning points on the shift learning range TLR. Based on the trend of the detection result, a target rotational position of the actuator 300 corresponding to each shift stage may be set. When the actuator 300 rotates to the target rotational position, the detent plate 111 rotates to the target rotational position, and the hooking part 112a can be located at the target point TP.

Referring to FIG. 5 , the control device 400 may set learning points P1 , P2 , P3 , P4 , P5 , P6 , and P7 on the shift learning range TLR.

After the shift learning range TLR is set by the first shift learning boundary BD1 and the second shift learning boundary BD2, the control device 400 sets a plurality of different learning points ( P1~P7) can be set. 5 shows that 7 learning points are set, but the number of learning points is not limited to 7 in the present invention. Among the plurality of learning points P1 to P7, the learning points P1 and P7 disposed at both ends may respectively correspond to the first shift learning boundary BD1 and the second shift learning boundary BD2.

The plurality of different learning points P1 to P7 at which the hooking portion 112a is located represent points determined according to the rotational position of the detent plate 111 . As the detent plate 111 is rotated by the actuator 300, the hooking portion 112a can pass through the plurality of learning points P1 to P7.

A plurality of different learning points P1 to P7 may be arranged at equal intervals. The interval between adjacent learning points may be the same as the interval between other adjacent learning points. However, according to some embodiments of the present invention, some or all of the intervals between the plurality of learning points P1 to P7 may be different.

After the learning points P1 to P7 are set, the control device 400 may control the actuator 300 to rotate the detent plate 111 . As the detent plate 111 rotates, the hooking portion 112a may pass through the plurality of learning points P1 to P7 in sequence. Whenever the hooking part 112a reaches each learning point P1 to P7 , the control device 400 may acquire the rotational position of the detent plate 111 and the rotational position of the actuator 300 . The rotational position of the detent plate 111 may be received from the first sensing unit 210 and the rotational position of the actuator 300 may be received from the second sensing unit 220 .

Referring to the rotational position of the actuator 300 for each learning point (P1 to P7), the control device 400 derives a trend of the detection result of the second detection unit 220 with respect to the detection result of the first detection unit 210 can do. The trend may be derived using a trend graph described later.

Referring to FIG. 6 , the control device 400 provides a detection result of the first sensing unit 210 and a second sensing unit ( 220) can be checked. The detection result of the first detector 210 is the rotational positions A1 to A7 of the detent plate 111 for each learning point P1 to P7, and the detection result of the second detector 220 is the learning point P1 ~ P7) may be the rotational positions (B1 to B7) of the actuator 300. The control device 400 controls a plurality of learning points on the graph plane based on the rotational positions A1 to A7 of the detent plate 111 and the rotational positions B1 to B7 of the actuator 300 for each learning point P1 to P7. Corresponding points (C1, C2, C3, C4, C5, C6, C7) can be set.

Subsequently, the control device 400 may generate a straight-line trend graph 500 close to the plurality of corresponding points C1 to C7 as shown in FIG. 7 . The control device 400 may derive a trend using the least squares method and generate a trend graph 500 . The sum of squares of distances between the straight-line trend graph 500 and the corresponding points C1 to C7 may be smaller than the sum of squares of distances between other straight-line graphs and the corresponding points C1 to C7.

Referring to FIG. 8 , after the trend graph 500 is set, the control device 400 applies the target rotation position TA of the detent plate corresponding to the target point TP to the trend graph 500 so that each gear shift A target rotational position TB of the actuator 300 for the stage may be set.

The control device 400 may set the target rotation position TB of the actuator 300 for each shift stage by performing the above process for all shift stages.

Referring to FIG. 9 , the target rotation position table 600 may include a shift stage field 610 and a target rotation position field 620 .

The shift stage field 610 may include a shift stage that may be set by the transmission 100 of the vehicle. The target rotational position field 620 may include target rotational positions TB1 , TB2 , TB3 , and TB4 of the actuator 300 .

The control device 400 may calculate the target rotational positions TB1 to TB4 of the actuator 300 for each shift stage through the above-described learning process. The calculated result is generated in the form of a target rotation position table 600 shown in FIG. 9 , and the control device 400 may store the target rotation position table 600 . Thus, when the shift stage of the vehicle is changed later, the control device 400 may control the actuator 300 by referring to the target rotation position table 600 . For example, if the target gear shift included in the shift gear shift command is the main gear range, the control device 400 controls the actuator 300 to rotate to the rotational position of TB1, and if the target gear shift gear is the driving gear, the control device 400 may control actuator 300 to rotate to the rotational position of TB4. When the actuator 300 rotates to the target rotational positions TB1 to TB4 specified in the target rotational position table 600 , the detent plate 111 may rotate to the target rotational position corresponding to the target shift stage.

Since the actuator 300 rotates the detent plate 111 according to the rotational position of the actuator 300 calculated by learning, the shift stage can be stably switched.

Although the embodiments of the present invention have been described with reference to the above and accompanying drawings, those skilled in the art to which the present invention pertains can implement the present invention in other specific forms without changing the technical spirit or essential features. You will understand that there is Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting.

10: vehicle transmission 100: transmission
110: detent part 111: detent plate
112: pressure supply unit 112a: locking unit
112b: elastic part 210: first sensing part
220: second sensing unit 300: actuator
400: control device

Claims (8)

transmission;
a detent plate provided in the transmission and having a plurality of detent grooves corresponding to shift stages of the transmission;
a locking portion provided in the transmission and inserted into a selected detent groove among the plurality of detent grooves to press the detent plate;
an actuator that rotates the detent plate so that a shift stage of the transmission is switched to a target shift stage corresponding to a shift stage change command;
a first detector detecting a rotational position of the detent plate;
a second sensing unit for sensing a rotational position of the actuator; and
Setting a target rotational position of the actuator for each shift stage based on a detection result of the first sensing unit and the second sensing unit when the locking unit is located at a plurality of different learning points for each of the plurality of detent grooves, and a control device controlling the actuator according to the set target rotational position. According to claim 1,
Further comprising an elastic portion for providing an elastic force to the engaging portion,
The actuator rotates the detent plate by providing a rotational force greater than the elastic force to the detent plate. According to claim 1,
The control device,
Setting a target point corresponding to a corresponding shift stage for each of the plurality of detent grooves;
Setting a shift learning range extended by a predetermined distance from the target point to both sides,
A target of the actuator corresponding to each shift stage based on a trend of a detection result of the second sensing unit with respect to a sensing result of the first sensing unit when the engaging part is located at a plurality of different learning points on the shift learning range A vehicle gearbox that sets the rotational position. According to claim 3,
The target point includes a lowest point of a corresponding detent groove. According to claim 3,
The distance between the shift learning boundary extending from the target point to one side and the target point is equal to or different from the distance between the shift learning boundary extending from the target point to the other side and the target point. According to claim 3,
The plurality of different learning points are arranged at equal intervals. According to claim 3,
The control device derives the trend using the least squares method. According to claim 1,
A plurality of different learning points at which the hooking portion is located represent points determined according to a rotational position of the detent plate.

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