KR20210057968A - Shift control system - Google Patents

Abstract

The present invention relates to a shift control system capable of performing control so as to make a switch to one shift range among a P range and a Not-P range through an actuator. The shift control system includes: an actuator; a sensing means sensing a count value in accordance with rpm of the actuator; a shaft rotated by the actuator; a detent plate on which the P range and the Not-P range which are dented parts are located on both sides of a projected crest respectively, rotated in accordance with the rotation of the shaft; a roller limiting the rotation of the detent plate, and fixing a shift range provided in the detent plate; and an electronic control part driving the actuator for switching the shift range, and determining in which area the roller is currently located among the P range and the Not-P range by using the count value sensed by the sensing means. According to the present invention, since the P range and the Not-P range are determined by using the count value of the sensing means such as a hall sensor or the like, production costs can be reduced, and the P range and the Not-P range can be more easily and accurately determined.

Description

Shift control system

The present invention relates to a shift control system for switching a shift range of an automatic transmission through an actuator.

BACKGROUND ART There is a shift control system for switching a shift range of an automatic transmission of a vehicle under electric control in accordance with an operation of a shift lever by a conventional driver.

In such a shift control system, when power is applied again after power-off, various methods have been proposed to determine the absolute position of the actuator. For example, prior to power-off, not only the shift range of the automatic transmission, but also the rotation position of the actuator is stored in a nonvolatile memory, or the value of a potentiometer indicating the amount of actuator driving to accurately position the manual valve. A shift-by-wire system using

In such a shift control system, the correct initial position cannot be acquired with the relative rotation amount through the encoder, and if the correct initial position is not set, wear occurs during rotation of the actuator, which may deteriorate durability and make normal operation impossible. There is a problem. Therefore, it is necessary to set the reference position through initial position detection.

In addition, a shift range is divided into a P range, which is a parking range for parking a vehicle in an automatic transmission of a vehicle, and a Not P range, which is a range excluding the parking range. Conventionally, in order to recognize such a shift range, a separate detection sensor or the like is provided in the shift range area, but there is a problem that additional cost is incurred, and the detection sensor is easily deteriorated due to temperature and humidity of the engine room.

Korean Patent Registration No. 10-0220070

The present invention has been conceived to solve the above problems, and an object thereof is to provide a vehicle shift control system capable of distinguishing between a P range and a not P range without a separate device such as a detection sensor.

In addition, another object of the present invention is to provide a shift control system capable of detecting an accurate initial position by detecting a wall.

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

In a shift control system that controls to switch to any one of the P range and the not P range through the actuator of the present invention to achieve this object, the actuator detects a count value according to the amount of rotation of the actuator. Means, the shaft rotated by the actuator, the P range and the notch P range, which are recessed portions on the boundary of the protruding crest, are located respectively, the detent plate rotating according to the rotation of the shaft, and the rotation of the detent plate are restricted. And, the roller for fixing the shift range provided on the detent plate and the actuator are driven to switch the shift range, and the current position of the roller is set to the P range by using the count value detected by the sensing means. It includes an electronic control unit that determines which region of the sickle P range is located.

The electronic control unit, when the shaft rotates to the left and the count value corresponds to a preset first reference value range, and the shaft rotates to the right and the count value corresponds to a preset second reference value range, the position of the roller If it is determined that it is in the P range, the shaft rotates to the left and the count value falls within the preset third reference value range, the shaft rotates to the right and the count value falls within the preset fourth reference value range, the roller It can be determined that the position of the sickle is in the P range.

The detent plate includes a P range region including a first wall as an outer wall and a second wall as the crest wall, and a sickle P range region including a third wall as the crest wall and a fourth wall as the outer wall. And the angle in which the first wall is inclined is referred to as a first angle, the angle in which the second wall is inclined is referred to as a second angle, and the angle in which the third wall is inclined is referred to as a third angle. When the angle at which the fourth wall is inclined is referred to as a fourth angle, the detent plate has a structure in which the size of the angle decreases in the order of the first angle, the second angle, the third angle, and the fourth angle. It can be formed as

The sensing means outputs a count value in inverse proportion to the size of the angle, the second reference value range has a larger value than the first reference value range, and the third reference value range is larger than the second reference value range. And the fourth reference value range may be set to have a larger value than the third reference value range.

The shift control system may further include a display unit for displaying an error message and an alarm unit for outputting an alarm sound.

The electronic control unit determines that the first wall is worn when the count value exceeds a predetermined first threshold when the roller is located on the side of the first wall, and displays an error message through the display unit. And, outputting an alarm sound through the alarm unit, when the roller is positioned on the side of the second wall, when the count value exceeds a predetermined second threshold, it is determined that the second wall is worn, and the An error message is displayed through the display unit, an alarm sound is output through the alarm unit, and when the roller is positioned on the third wall side, when the count value exceeds a predetermined third threshold, the third wall is worn. When it is determined that it has been, an error message is displayed through the display unit, an alarm sound is output through the alarm unit, and the count value exceeds a predetermined fourth threshold when the roller is located on the fourth wall side , It is determined that the fourth wall is worn, an error message is displayed through the display unit, and an alarm sound may be output through the alarm unit.

The electronic control unit measures an input time, which is a time when signals are input from the plurality of detection means according to the drive of the actuator, and measures a change in the input time, and detects whether the roller has reached the wall of the corresponding shift range. And, when detecting that the roller has reached the wall of the shift range, the position of the roller at this time is checked, the roller is separated from the wall, and the position of the roller separated from the wall is calculated as the initial position. However, when the instantaneous slope value of the increase rate, which is the increase rate of the input time per unit time, is greater than or equal to a predetermined reference value, it may be detected that the roller has reached the wall of the corresponding shift range.

According to the present invention, by determining the P range and the not P range using the count value of the detection means such as a Hall sensor, it is possible to reduce the production cost, and it is possible to more easily and accurately determine the P range and the not P range. It works.

In addition, according to the present invention, by determining the P range and the sickle P range, when the shaft is already located in the P range or the sickle P range, there is an effect of preventing an error of operating in the P range or the sickle P range again. .

In addition, according to the present invention, by providing a fault diagnosis function to determine the wear of each wall constituting the P range and the sickle P range, when wear occurs on a specific wall, an error message and an alarm sound are output to facilitate the user. It has the effect of being able to recognize whether a specific wall is worn or not.

In addition, according to the present invention, by detecting a change in the input time of the sensing means in the shift control system to detect the initial position, there is an effect of preventing abrasion occurring during rotation of the actuator and improving durability.

1 is a diagram showing the configuration of a shift control device.
2 is a view showing the overall appearance of the detent plate in the shift control system according to an embodiment of the present invention.
3 is a cross-sectional view showing a structure of a detent plate portion in a shift control system according to an embodiment of the present invention.
4 is a graph showing an encoder input time according to an operation of a shift control system according to an embodiment of the present invention.
5 is a diagram illustrating a process of switching a shift range according to an embodiment of the present invention.
6 is a graph showing an encoder input time according to an operation of a shift control system according to another embodiment of the present invention.
7 is a diagram showing an input waveform of a sensing means according to an embodiment of the present invention.
8 is a block diagram showing the configuration of a shift control system according to an embodiment of the present invention.
9 is a flowchart illustrating a method of detecting an initial position in a shift control system according to an embodiment of the present invention.
10 is a flowchart illustrating a method of detecting an initial position in a shift control system according to another embodiment of the present invention.
11 is a flowchart illustrating a method of determining a P range and a not P range in a shift control system according to an embodiment of the present invention.

In the present invention, various modifications may be made and various embodiments may be provided, and specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof does not preclude in advance.

Unless otherwise defined, all terms including technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in the present application. Does not.

In addition, in the description with reference to the accompanying drawings, the same reference numerals are assigned to the same components regardless of the reference numerals, and redundant descriptions thereof will be omitted. In describing the present invention, when it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

The present invention relates to a shift control system for switching to any one of a plurality of consecutive shift ranges through an actuator.

As an embodiment of the present invention, P range, which is a parking range for parking, among shift ranges, and Not P range, which is a range excluding the parking range, is illustrated. I will explain.

1 is a diagram showing the configuration of a shift control device.

Referring to FIG. 1, the shift control device 48 includes a shaft 102 that rotates by an actuator 42, a detent plate 100 that rotates according to the rotation of the shaft 102, and a detent plate 100. A rod 104 that operates according to rotation, a parking gear 108 fixed to the output shaft of a transmission (not shown), a parking lock pawl 106 for locking the parking gear 108, and a detent spring ( 110), and a roller 112 that limits the rotation of the detent plate 100 and fixes the shift range.

The detent plate 100 functions as shift means driven by the actuator 42 to switch the shift range. And, the shaft 102, the detent plate 100, the rod 104, the detent spring 110, and the roller 112 function as a shift switching mechanism. Further, the sensing means 46 functions as a counting means for obtaining a count value according to the amount of rotation of the actuator 42. In an embodiment of the present invention, the sensing means 46 may be implemented as a Hall sensor.

1 shows the state of the shift range in the current sickle P range. In this state, since the parking lock pawl 106 does not lock the parking gear 108, rotation of the drive shaft of the vehicle is not hindered. Starting from this state, the actuator 42 rotates the shaft 102 clockwise so that the rod 104 is pushed up through the detent plate 100 in the direction indicated by the arrow A, and the parking lock The pawl 106 is pushed by a tapered portion of the end of the rod 104 in the direction indicated by the arrow B. As the detent plate 100 rotates, the roller 112 of the detent spring 110 located at the sickle P range position 120 located in one of the depressions in the upper portion of the detent plate 100 is crested. (crest) (122) is crossed, and it is retracted and lowered to the P range position. The roller 112 is provided on the detent spring 110 in a structure capable of rotating in the axial direction.

When the detent spring 110 rotates enough to allow the roller 112 to move to the P range position 124, the parking lock pawl 106 is pushed up to the position where it engages the parking gear 108. In this way, the drive shaft of the vehicle is mechanically fixed, and the shift range is switched to the P range.

2 is a view showing the overall appearance of a detent plate in the shift control system according to an embodiment of the present invention.

Referring to FIG. 2, of the two surfaces of each depression extending from a lower portion of the depression of the detent plate 100, a surface located away from the crest 122 is referred to as a "wall". That is, when the roller 112 that has passed the crest 122 descends to the lower portion of the depression, a wall appears at a position where it collides against the roller 112 of the detent spring 110. The wall of the P range position 124 is referred to as "P wall", and the wall of the sickle P range position 120 is referred to as "sickle P wall".

In the present invention, the outer wall in the P range 124 region is referred to as the first wall 201, the wall toward the crest 122 is referred to as the second wall 202, and the crest 122 in the sickle P range 120 region. The wall on the) side is called the third wall 203, and the wall on the outside side is called the fourth wall 204.

8 is a block diagram showing the configuration of a shift control system according to an embodiment of the present invention.

1, 2 and 8, the shift control system according to an embodiment of the present invention includes an actuator 42, a sensing means 46, an electronic control unit (ECU) 40, and a P switch. (20), a shift control device (48) is included.

The P switch 20 is used to switch the shift range between the P range and the not P range, and includes an indicator indicating the state of the switch to the driver as well as an input unit that receives a command from the driver. The driver can input a command to switch the shift range to the P range through the P switch 20.

The sensing means 46 detects a count value according to the amount of rotation of the actuator 42. In an embodiment of the present invention, the sensing means 46 may be implemented as a Hall sensor.

The shaft 102 is rotated by an actuator 42.

In the detent plate 100, the shift ranges 120 and 124, which are depressed portions of the protruding crest 122, are located, and the walls 201, 202, 203 and 204 are separated from each of the shift ranges 120 and 124. It includes, and rotates according to the rotation of the shaft 102.

The roller 112 limits rotation of the detent plate 100 and serves to fix the shift ranges 120 and 124 provided in the detent plate 100.

The electronic control unit 40 drives the actuator 42 to switch the shift range, and determines whether the current position of the roller 112 is in the P range or the not P range by using the count value detected by the sensing means. can do.

In the present invention, the electronic control unit 40 rotates the shaft 102 to the left and the count value corresponds to a preset first reference value range, the shaft 102 rotates to the right, and the count value falls within a preset second reference value range. If so, it is determined that the position of the roller 112 is in the P range.

When the shaft 102 rotates to the left and the count value corresponds to a preset third reference value range, the shaft 102 rotates to the right and the count value corresponds to a preset fourth reference value range, It is determined that the position of the roller 112 is in the sickle P range.

Then, the electronic control unit 40 drives the actuator 42 to switch the shift range, measures the input time of the detection means 46 according to the drive of the actuator 42, and the input time of the detection means 46 By measuring the change in, it is detected whether the roller 112 has reached the wall of the shift range, and when detecting that the roller 112 has reached the wall of the shift range, the position of the roller 112 at this time is determined. After checking, the roller 112 is spaced apart from the wall, and the initial position can be calculated by calculating the distance from the wall to the current position of the roller 112.

In the present invention, the actuator 42 may include an SR (Switched Reluctance) motor, and drives the shift control device 48 in response to a command from the electronic control unit 40. The sensing means 46 rotates together with the actuator 42 to detect the rotational state of the SR motor. The electronic control unit 40 may receive signals output from the sensing means 46 in order to know the rotational state of the SR motor, and use this to perform energization control for driving the SR motor.

In one embodiment of the present invention, the electronic control unit 40 detects that the roller 112 has reached the wall of the corresponding shift range when the time for inputting the signal from the sensing means 46 increases above a predetermined first reference value. can do.

Alternatively, in another embodiment of the present invention, when the instantaneous inclination value of the increase rate of the time at which the signal is input from the sensing means 46 is equal to or greater than the second predetermined reference value, the roller 112 is It can be detected as reaching the wall of.

In the present invention, when the roller 112 moves from the P range 124 to the sickle P range 120, the electronic control unit 40 can control the actuator 42 so that the sickle P wall does not hit the roller 112. And vice versa can be controlled in the same way.

3 is a cross-sectional view showing a structure of a detent plate portion in a shift control system according to an embodiment of the present invention.

Referring to FIG. 3, the detent plate 100 includes a P range 124 region including a first wall 201 that is an outer wall and a second wall 202 that is a crest 122 side, and a crest 122. It can be seen that the sickle P range 120 region including the third wall 203 as the side wall and the fourth wall 204 as the outer wall is provided.

In the present invention, the angle at which the first wall 201 is inclined is referred to as the first angle 301, the angle at which the second wall 202 is inclined is referred to as the second angle 302, and When the angle at which the three walls 203 is inclined is referred to as the third angle 303 and the angle at which the fourth wall 204 is inclined is referred to as the fourth angle 304, the detent plate 100 is 301, the second angle 302, the third angle 303, the fourth angle 304 may be formed in a structure in which the size of the angle decreases in order.

For example, the first angle 301 may be 80°, the second angle 302 may be 70°, the third angle 303 may be 60°, and the fourth angle 304 may be 40°.

In the present invention, the sensing means 46 outputs a count value in inverse proportion to the size of the angles of the first angle 301, the second angle 302, the third angle 303, and the fourth angle 304. The larger the angle in the first angle 301, the second angle 302, the third angle 303, and the fourth angle 304, the greater the repulsive force, which is the force that resists when the roller 112 hits the wall. Since the rotational force decreases as the resistance force is transmitted to the shaft 102, the angle of the first angle 301, the second angle 302, the third angle 303, and the fourth angle 304 in the sensing means 46 Outputting the count value in inverse proportion to the size is a natural result of the structure of the shift control system.

In a structure in which the size of the detent plate 100 decreases in the order of the first angle 301, the second angle 302, the third angle 303, and the fourth angle 304, the first reference value range It may be set that the second reference value range has a larger value, the third reference value range has a larger value than the second reference value range, and the fourth reference value range has a larger value than the third reference value range.

For example, in a structure in which the first angle 301 is 80°, the second angle 302 is 70°, the third angle 303 is 60°, and the fourth angle 304 is 40°, the roller ( When 112) moves from A to A1 and hits the first wall 201, the first reference value range is set to 30 to 35, and the roller 112 moves from A to A2, and the second wall 202 In the case of colliding with, the second reference value range is set to 36 to 40, and the third reference value range is set to 41 to 45 when the roller 112 collides with the third wall 203 while moving from the B to B1 position, When the roller 112 collides with the fourth wall 204 while moving from the position B to the B2 position, the fourth reference value range may be set to 46-50.

For example, if the shaft 102 rotates to the left and the count value is 31, the shaft 102 rotates to the right and the count value is 38, the electronic control unit 40 indicates that the position of the roller 112 is in the P range ( 124).

And, if the shaft 102 rotates to the left and the count value is 44, and the shaft 102 rotates to the right and the count value is 49, the electronic control unit 40 determines the position of the roller 112 is better P range 120 ).

In an embodiment of the present invention, the shift control system may provide a fault diagnosis function, which is a function of determining whether a specific wall is worn. To this end, the shift control system may further include a display unit for displaying an error message and an alarm unit for outputting an alarm sound.

At this time, the electronic control unit 40 determines that the first wall 201 is worn when the count value exceeds a first predetermined threshold when the roller 112 is positioned on the side of the first wall 201 , An error message may be displayed through the display unit, and an alarm sound may be output through the alarm unit.

In addition, when the roller 112 is positioned on the second wall 202 side, when the count value exceeds a second predetermined threshold, the electronic control unit 40 determines that the second wall 202 is worn. , An error message may be displayed through the display unit, and an alarm sound may be output through the alarm unit.

In addition, when the roller 112 is positioned on the third wall 203 side, when the count value exceeds a predetermined third threshold, the electronic control unit 40 determines that the third wall 203 is worn. , An error message may be displayed through the display unit, and an alarm sound may be output through the alarm unit.

Further, the electronic control unit 40 determines that the fourth wall 204 is worn when the count value exceeds the fourth predetermined threshold when the roller 112 is positioned on the fourth wall 204 side. , An error message may be displayed through the display unit, and an alarm sound may be output through the alarm unit.

For example, assuming that the first threshold is 20, when the roller 112 is positioned on the first wall 201, when the count value exceeds 20, the first wall 201 is It is determined that it is worn, an error message is displayed through the display unit, and an alarm sound may be output through the alarm unit. It is expected that the first wall 201 and the fourth wall 204 will wear the most due to the characteristics of gears of a shift by wire (SBW) method.

4 is a graph showing an encoder input time according to an operation of a shift control system according to an embodiment of the present invention.

In FIG. 4, three sensing means are provided, and the result of an experiment is shown in which the roller 112 moves from the P range 124 toward the first wall 201 according to the drive of the actuator 42.

In Fig. 4, the input waveforms of the three sensing means, A, B, C, and an encoder input time graph are shown.When the roller 112 is in the P range 124, the sensing means input time is 2 ms, and the roller ( It can be seen that as 112) approaches the first wall 201, the sensing means input time increases, and when the first wall 201 collides, the sensing means input time increases to 4 ms.

As described above, in an embodiment of the present invention, when the input time of the sensing means increases by more than the first reference value, the roller 112 detects that the first wall 201 collides, and after the first wall 201 is detected, It is possible to detect the P range reference position by performing correction as much as the detection means count value calculated in.

4 illustrates a case where the roller 112 is in the P range 124, but the fourth wall 204 can be detected in the same manner even when the roller 112 is in the sickle P range 120. .

7 is a view showing an input waveform of a sensing means according to an embodiment of the present invention.

First, referring to FIG. 7(a) for an embodiment, the input time between the sensing means input in the process of moving the actuator 42 from the initial position P range 124 to the first wall 201 is measured. will be.

Before the actuator 42 reaches the first wall 201, the input time between the sensing means is T1, T2 ... It is constant as Tn, but the time it reaches the first wall 201 increases the input time of the sensing means as Tn + α, and through this, the position of the first wall 201 can be detected.

Next, referring to FIG. 7(b) for another embodiment, the input time between sensing means input in the process of moving the actuator 42 from the initial position P range 124 to the first wall 201 Is measured.

Before the actuator 42 reaches the first wall 201, the input time between the sensing means is T1, T2 ... It is constant like Tn, but as it approaches the first wall 201, the input time of the sensing means increases, such as Tn + α and Tn + β. Then, at the moment of reaching the first wall 201, the increase of the sensing means input time, such as Tn + γ, is at a rate of a preset increase rate (the increase rate of the increase in the sensing means input time per unit time is Tn + γ). When the stretched phenomenon is detected, the position of the first wall 200 is detected through the detection result.

6 is a graph showing an encoder input time according to an operation of a shift control system according to another embodiment of the present invention.

6, in another embodiment of the present invention, when the roller 112 moves from the P range 124 toward the first wall 201, the input time of the sensing means gradually increases due to the inclination, and the first wall 200 ) At the time of detection, the input time of the sensing means increases rapidly.

In the embodiment of FIG. 6, when the instantaneous descriptor 620 of the increase rate of the sensing means input time is greater than the second predetermined reference value 610, the first wall 201 is detected at the corresponding time point. This is similarly applicable when the roller 112 is in the sickle P range 120.

5 is a diagram illustrating a process of switching a shift range according to an embodiment of the present invention.

Referring to FIG. 5, when the shift range is switched between the P range 124 and the not P range 120 in the present invention, proportional integral derivative (PID) control is performed.

In FIG. 5, (a) shows the conversion from the sickle P range 120 to the P range 124, and (b) is a diagram showing the conversion from the P range 124 to the sickle P range 120 on the contrary. .

PID control is a control method that measures the output value of the object to be controlled, compares it with a desired setpoint, calculates an error, and calculates the control value necessary for control using this error value. to be.

The PID control method for switching the shift range between the P range 124 and the not P range 120 is as follows.

First, if the PID control parameter is classified, the output value is the input value of the detection means counter according to the driving of the motor (increase when rotating in the forward direction, decrease when rotating in the reverse direction), and the set value is a sensing means counter required for 20˚ movement of the roller 112 Is the target value (80 times for an 8-pole motor with a gear ratio of 60:1), the control value is the PWM output value for driving the motor, and the error is the difference between the set value and the output value.

And, the range conversion method is as follows.

First, when switching from the sickle P range 120 to the P range 124, if the output value is smaller than the set value, the motor is rotated in the forward direction, and if the output value is greater than the set value, the motor is rotated in the reverse direction.

And, when switching from the P range 124 to the better P range 120, if the output value is smaller than the set value, the motor is rotated in the reverse direction, and if the output value is greater than the set value, the motor is rotated in the forward direction.

9 is a flowchart illustrating a method of detecting an initial position in a shift control system according to an embodiment of the present invention.

Referring to FIG. 9, the actuator 42 is driven to change the shift range in the shift control system (S101).

Then, the input time of the sensing means 46 is measured (S103).

Then, by measuring the change in the input time of the sensing means 46, it is detected whether the roller 112 has reached the wall of the shift range (S105, S107).

Here, when the time for inputting a signal from the sensing means 46 in step S105 increases beyond a predetermined first reference value, it is detected that the roller 112 has reached the wall of the corresponding shift range. For example, when the roller 112 is in the P range 124, it is detected whether the first wall 201 is reached.

Next, when detecting that the roller 112 has reached the wall of the shift range (S107), the position of the roller 112 at this time is checked, the roller 112 is separated from the wall, and the current roller ( The initial position is calculated by calculating the distance to the position of 112) (S109).

10 is a flowchart illustrating a method of detecting an initial position in a shift control system according to another embodiment of the present invention.

Referring to FIG. 10, the actuator 42 is driven to change the shift range in the shift control system (S201).

Then, the input time of the sensing means 46 is measured (S203).

Then, by measuring the change in the input time of the sensing means 46, it is detected whether the roller 112 has reached the wall of the shift range (S205, S207).

Here, in step S205, when the instantaneous slope of the increase rate of the time when the signal is inputted from the sensing means 46 increases above a predetermined second reference value, it is detected that the roller 112 has reached the wall of the corresponding shift range. For example, when the roller 112 is in the P range 124, it is detected whether the first wall 201 is reached.

Next, when detecting that the roller 112 has reached the wall of the shift range (S207), the position of the roller 112 at this time is checked, the roller 112 is separated from the wall, and the current roller ( The initial position is calculated by calculating the distance to the position of 112) (S209).

11 is a flowchart illustrating a method of determining a P range and a not P range in a shift control system according to an embodiment of the present invention.

Referring to FIG. 11, the actuator 42 is driven to change the shift range in the shift control system (S301).

The electronic control unit 40 rotates the shaft 102 to the left and the count value falls within a preset first reference value range (S303), and the shaft 102 rotates to the right, and the count value falls within a preset second reference value range. If applicable (S305), it is determined that the position of the roller 112 is in the P range 124 (S307).

In addition, the electronic control unit 40 rotates the shaft 102 to the left and the count value corresponds to a preset third reference value range (S309), the shaft 102 rotates to the right, and the count value is preset fourth reference value. If it falls within the range (S311), it is determined that the position of the roller 112 is in the better P range 124 (S313).

Although the present invention has been described using several preferred embodiments, these embodiments are illustrative and not limiting. Those of ordinary skill in the art to which the present invention pertains will understand that various changes and modifications can be made without departing from the spirit of the present invention and the scope of the rights set forth in the appended claims.

48 shift control unit 42 actuator
102 shaft 100 detent plate
104 Road 108 Parking Gear
106 Parking lock pole 110 Detent spring
112 roller 20P switch
40 ECU 42 actuator
46 detection means 48 shift control device
201 First wall 202 Second wall
203 third wall 204 fourth wall
301 Angle 1 302 Angle 2
303 3rd leg 304 4th leg
120 Not P range 124 P range

Claims (6)

In a shift control system that controls to switch to any one of the P range and the not P range through an actuator,
Actuator;
Sensing means for detecting a count value according to the rotation amount of the actuator;
A shaft rotated by the actuator;
A detent plate in which a P range and a sickle P range, each of which are recessed portions of the protruding crest as a boundary, are located and rotate according to the rotation of the shaft;
A roller for limiting rotation of the detent plate and fixing a shift range provided in the detent plate; And
An electronic control unit that drives the actuator to switch a shift range and determines whether the current position of the roller is in the P range or the not P range by using the count value detected by the sensing means.
Shift control system comprising a.
The method according to claim 1,
The electronic control unit,
If the shaft rotates to the left and the count value falls within a preset first reference value range, and the shaft rotates to the right and count value falls within a preset second reference value range, the position of the roller is in the P range. Judge,
If the shaft rotates to the left and the count value falls within the preset third reference value range, and the shaft rotates to the right and the count value falls within the preset fourth reference value range, the position of the roller is better within the P range. A shift control system, characterized in that it is determined to be.
The method according to claim 2,
The detent plate includes a P range region including a first wall as an outer wall and a second wall as the crest wall, and a sickle P range region including a third wall as the crest wall and a fourth wall as the outer wall. Equipped,
Based on the bottom surface, the angle in which the first wall is inclined is referred to as a first angle, the angle in which the second wall is inclined is referred to as a second angle, and the angle in which the third wall is inclined is referred to as a third angle, When the angle at which the fourth wall is inclined is called a fourth angle,
The shift control system, wherein the detent plate has a structure in which the size of the angle decreases in the order of the first angle, the second angle, the third angle, and the fourth angle.
The method of claim 3,
The sensing means outputs a count value in inverse proportion to the size of the angle,
The second reference value range has a larger value than the first reference value range, the third reference value range has a larger value than the second reference value range, and the fourth reference value range is larger than the third reference value range. Shift control system, characterized in that it has a value.
The method of claim 3,
The shift control system further includes a display unit for displaying an error message and an alarm unit for outputting an alarm sound,
The electronic control unit,
When the roller is located on the side of the first wall, when the count value exceeds a predetermined first threshold, it is determined that the first wall is worn, an error message is displayed through the display unit, and the alarm unit To output an alarm sound through
When the roller is positioned on the side of the second wall, when the count value exceeds a predetermined second threshold, it is determined that the second wall is worn, an error message is displayed through the display unit, and the alarm unit To output an alarm sound through
When the roller is located on the side of the third wall, when the count value exceeds a predetermined third threshold, it is determined that the third wall is worn, an error message is displayed through the display unit, and the alarm unit To output an alarm sound through
When the roller is positioned on the fourth wall side, when the count value exceeds a predetermined fourth threshold, it is determined that the fourth wall is worn, an error message is displayed through the display unit, and the alarm unit Shift control system, characterized in that outputting an alarm sound through.
The method according to claim 1,
The electronic control unit measures an input time, which is a time when signals are input from the plurality of detection means according to the drive of the actuator, and measures a change in the input time, and detects whether the roller has reached the wall of the corresponding shift range. And, when detecting that the roller has reached the wall of the shift range, the position of the roller at this time is checked, the roller is separated from the wall, and the position of the roller separated from the wall is calculated as the initial position. However, when the instantaneous inclination value of the increase rate, which is the increase rate of the input time per unit time, is greater than or equal to a predetermined reference value, it is detected that the roller has reached the wall of the corresponding shift range.

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