KR102572478B1 - Method to learn the exact position of each shift stage of a gear shift actuator - Google Patents

Abstract

The present invention relates to a method for learning the front end position of a gear shift actuator, and more particularly, to a method for learning the front end position of a gear shift actuator according to the driving of a 4-stage detent plate and a detent spring, comprising: (a) a gear moving the actuator back and forth to all shift stages before shifting; (b) measuring a current value generated when the actuator moves at the same torque by controlling a constant duty and a moving speed of the actuator; and (c) determining and learning regular unit values of all shift stages based on the current value measured in step (b) and the moving speed of the actuator.
That is, according to the present invention, the actuator reciprocates through all gear stages before the SCU performs gear shifting, and determines and learns the regular value of each gear stage by itself. We would like to propose a method for learning the top position of a gear shift actuator that can improve complementarity so that it can perform.

Description

Method to learn the exact position of each shift stage of a gear shift actuator}

In the present invention, before the SCU performs gear shifting, the actuator reciprocates through all shift stages, determines and learns the regular value of each shift stage, and performs smooth control even in the case of mechanical shape deformation according to the tolerance of the transmission or the manufacturer. It relates to a method for learning the top end position of a gear shift actuator that can enable this.

In general, a transmission is a key component in driving a vehicle that functions to transmit power generated from an engine to wheels by increasing or decreasing rotational force of the engine according to driving conditions of the vehicle.

Such a transmission is divided into a manual transmission and an automatic transmission according to a shifting method. Recently, automatic transmissions are used in most vehicles because of the advantage of convenient and smooth start-up without requiring a separate clutch operation.

At this time, the driving mode of the automatic transmission can be determined through a shift lever system, which uses an electrical signal using a board instead of a mechanical shift lever system that shifts gears through a mechanical link structure through a wire and a mechanical link structure. It is divided into an electric shift lever system that shifts gears by

Unlike the mechanical shift lever system, the electric shift lever system transmits the information of the shift stage selected by the driver as an electrical signal without a mechanical connection between the transmission and the shift lever, so shock and vibration do not occur. Since gear shifting due to unintentional movement of the lever can be prevented by simplifying the connecting means between the device and the transmission, vehicles adopting the electric shift lever system are gradually increasing despite the disadvantage of being expensive.

In order to perform stable shift control in such an electric shift lever system, it is important to determine the position of the motor. In the conventional electric shift lever system, attempts have been made to determine the position of the motor using a hall sensor attached to the inside of the electric motor. , Hall sensors can only measure the relative rotation amount of the motor, but cannot measure the absolute rotation angle, so it is difficult to determine the exact position of the motor.

In order to solve the above problem, an attempt to measure the absolute rotation angle or position of the electric motor by attaching a non-contact position sensor used in a manual shift lever has been proposed, but a PWM (Phase Width Modulation) signal output from the non-contact position sensor has been proposed. has a low update rate, making it difficult to accurately measure the position of the motor even according to the above method.

In addition, conventionally, after the motor is rotated so that the detent plate is blocked by the wall and does not move any more, the time point at which no change is detected by the hall sensor is checked, and the absolute position of the motor is learned using this as a reference point, A method for determining the location has also been proposed, but the method has the disadvantage of forcibly driving the motor to learn the location of the motor and requiring additional time for learning.

That is, although accurately determining the current position of the motor is a major task of today's vehicle technology to which the electric shift lever system is mainly applied, it is difficult to simply and accurately determine the position of the motor only with conventionally proposed methods.

Therefore, in order to improve the performance of the electric shift lever system, a new method for more precisely determining the position of the motor is required.

Korean Registered Patent No. 10-2100267 (registered on 2020.04.07)

The present invention has been made to solve the above problems,

Before the SCU performs gear shifting, the actuator reciprocates through all shift stages to determine and learn the regular value of each shift stage, enabling smooth control even in the case of mechanical shape deformation according to the tolerance or manufacturer of the transmission. One purpose is to improve complementarity.

The present invention determines and learns the regular value of each shift stage by detecting a section in which the current consumption decreases and the actuator travel speed decreases using the current value and the movement speed of the actuator measured during movement of each shift stage. Another object of the present invention is to more accurately and precisely determine and learn the regular unit of the shift stage.

A method for learning the front end position of a gear shift actuator according to the present invention is a method for learning the end position of a gear shift actuator according to the driving of a 4-stage detent plate and a detent spring, (a) before gear shifting, reciprocally moving the actuator to all shift stages; (b) measuring a current value generated when the actuator moves at the same torque by controlling a constant duty and a moving speed of the actuator; and (c) determining and learning regular unit values of all shift stages based on the current value measured in step (b) and the moving speed of the actuator.

Characterized in that the regular unit of each shift stage learned in the step (c) according to the present invention is a section in which the current consumption decreases and the moving speed of the actuator increases based on the measured current value and the conveying speed of the actuator to be

According to the present invention, the current consumption is measured by the current of the driving motor through the driving of the 4-stage detent plate and the detent spring, and the movement speed of the actuator is determined by a position sensor or a phase sensor and the actuator according to the current change time. It is characterized by measuring through position detection.

The method for learning the top position of a gear shifting actuator according to the present invention uses the current value measured during movement of each shift stage and the movement speed of the actuator to detect a section in which the current consumption decreases and the movement speed of the actuator decreases, and each shift is performed. The regular unit value of each gear stage is judged and learned. This not only detects the regular unit value of each gear stage more accurately in that the unit value of each gear shift stage is determined and learned using two factors. Through this, it is possible to enable accurate shift control.

In addition, in the case of the conventional transmission or lever, the tolerance between the product and the drawing is strictly managed based on important dimensions, and normal transmission cannot be performed even if it is slightly out of order, so it is treated as a defective product. Since the position is judged, tolerance can be afforded, and the effect of absorbing poor dispersion can be expected.

In addition, according to the present invention, even if a mechanical shape change occurs, vehicle safety can be improved through normal control or fault determination.

In addition, in the present invention, since the learning logic is optimized, accuracy can be ensured, so that the apex position can be determined without an additional sensor, and the economic effect of suppressing unnecessary cost increase can be improved.

1 is a cross-sectional view showing a gear shift actuator according to the present invention;
2 is a flowchart showing a method for learning the top end position according to the present invention;
3 is a control logic showing a method for learning an end position according to the present invention;
4 is a graph showing a section set to measure the moving speed and current consumption at each shift stage in the detent plate according to the present invention;
5 is a graph showing the relationship between the movement speed of the actuator and current consumption in each gear range in FIG. 4;

In order to explain the present invention and the operational advantages of the present invention and the objectives achieved by the practice of the present invention, the following describes a preferred embodiment of the present invention and references it.

First, the terms used in this application are used only to describe specific embodiments, and are not intended to limit the present invention, and singular expressions may include plural expressions unless the context clearly indicates otherwise. In addition, in this application, terms such as "comprise" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other It should be understood that the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof is not precluded.

In describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

First, if the terms expressed in this specification are not strictly defined, 'top position' means the correct position of each shift stage in a mechanical sense, and 'learning of the top position' means the position instead of the predetermined top position. It means the ability to learn by self-determination of values.

In addition, 'mechanical shape change' refers to durable shape change including cracking and wear, and manufacturing shape change including tolerance, manufacturer change, material change, and inspection omission.

As shown in FIGS. 1 to 3, the method for learning the front end position of the gear shift actuator 30 according to the present invention includes step (a) of reciprocating the actuator 30 to all shift stages (S100), the current value and Step (b) of measuring the moving speed of the actuator 30 (S200) and step (c) of determining and learning the regular value of all shift stages based on the measured current value and the moving speed of the actuator 30 (S300) ) is composed of.

In general, the electric shift lever system means a system that recognizes the driver's operation of the gear selector (shift lever) and switches the gear stage of the transmission by rotating the motor based on this recognition. coupled to the detent plate 10, which rotates according to the rotation of the driving motor, and the detent spring 20, which moves up and down by the rotation of the detent plate 10, is used. Thus, the gear shift of the vehicle can be switched.

In the electric shift lever system as described above, the present invention proposes a method for learning the regular unit value of the gear shift actuator 30 according to the driving of the 4-stage detent plate 10 and the detent spring 20. In will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 3 , step (a) (S100) according to the present invention is a step of reciprocating and moving the actuator 30 to all shift stages before gear shifting is performed.

(a) In step (S100), before gear shifting, that is, when manufacturing a car and assembling a transmission equipped with a transmission, the first transmission is assembled in the neutral stage, that is, N-stage, and started by turning on 'IGN ON' In , by manipulating the shift lever to switch from N-range to P-range or D-range, and moving back and forth from D-range to P-range or from P-range to D-range, the actuator 30 can reciprocate all shift stages. will do

That is, the shift lever is shifted from 'N-range → P-range → D-range → P-range → D-range → P-range' so that the actuator 30 can move back and forth through all the shift stages.

As shown in FIGS. 1 to 3, step (b) according to the present invention (S200) controls the actuator 30 with a constant duty to move at the same torque, and the current value and the movement of the actuator 30 This step is to measure speed.

In step (b) (S200), a specific measured palter is collected as data while the actuator 30 reciprocates through all gear stages in step (a) (S100). At this time, in order to collect reliable data, the actuator 30 is controlled to move with the same torque by controlling a constant duty.

During this process, a current value and a moving speed of the actuator 30 generated when the actuator 30 reciprocates through each shift stage are measured.

As shown in FIGS. 1 to 3 , in step (c) (S300) according to the present invention, based on the current value measured in step (b) (S200) and the moving speed of the actuator 30, all shift stages are changed. This is the stage of judging and learning regular units.

(c) In step S300, in the process of the actuator 30 reciprocating through all the shift stages, the change in the current value in the specific section of each shift stage and the change value of the moving speed of the actuator 30 are used to determine each shift stage. It learns by judging the regular unit of .

Here, the specific section of each shift stage means a section in which the current consumption decreases and the moving speed of the actuator 30 increases based on the measured current value.

First, the detent plate 10 is composed of ridges and valleys, and the current value measured at the position of the ridges and valleys of the detent spring 20 varies according to the actuator 30 driving each ridge and valley. That is, when the detent spring 20 is located at the valley position, the detected current value is relatively small, and when the detent spring 20 is located at the peak position, the detected current value is relatively large. Therefore, the current consumption also differs at the positions of the peaks and valleys. This means that the current consumption increases when the detent spring 20 is driven from the valley to the valley, and conversely, when the detent spring 20 is driven from the valley to the valley. current consumption is reduced. In this case, the current value or current consumption is detected by measuring the current of the driving motor through the driving of the detent plate 10 and the detent spring 20 .

Next, when the detent spring 20 moves, the movement speed of the actuator 30 decreases due to the generation of repelling torque from the valley to the mountain, but the movement speed of the actuator 30 increases due to the generation of propulsion torque due to elasticity at the moment it passes the mountain will do In this case, the moving speed of the actuator 30 is detected by measuring the position of the actuator 30 according to the current change time using a position sensor or a phase sensor.

That is, as described above, the present invention generates propulsion torque and acceleration when moving to a specific section of each shift stage, that is, to the front end position of each shift stage, which reduces current consumption and simultaneously increases the moving speed of the actuator 30 It is possible to perform the learning function by setting the decreasing section as the top end position.

As shown in FIG. 4, this is when the rod of the drive motor moves from the valley to the mountain in each gear range of the detent plate 10, that is, in the illustration of FIG. 4, ② → ④, ⑥ → ⑧, ⑩ → ⑫, In the section of ⑭ → ⑮, it can be expected that the load on the driving motor increases due to the generation of repulsive torque. Conversely, when moving from mountain to valley at each gear stage, that is, in the section ① → ②, ④ → ⑥, ⑧ → ⑩, ⑫ → ⑭ in the city of FIG. 4, it can be expected that the load of the drive motor is reduced due to the generation of propulsion torque .

Based on the above results, FIG. 5 shows the relationship between the moving speed of the actuator and the amount of current consumed by the driving motor at each shift stage as a test value.

That is, FIG. 5(a) shows the relationship between the moving speed of the actuator and the current consumption of the driving motor when moving from 'P stage → D stage', and FIG. 5(b) shows the actuator when moving from 'D stage to P stage' It is the relationship between the moving speed of and the amount of current consumed by the driving motor.

The test results of FIGS. 4 and 5 show that since the actuator is operated at a constant duty, the moving speed of the actuator is P/R/N/D, which is the point at which the slope is converted from downhill (mountain → valley) to uphill (valley → mountain). It moves the fastest at the location (the valley of the detent plate).

In addition, the current consumption of the actuator is the lowest at the point where the downhill slope, which is most assisted by the detent spring force, is the largest, and the highest at the point where the uphill slope, which is most hindered by the detent spring force, is the largest. .

In addition, current consumption above a certain value occurs at the point where the slope changes from downhill to uphill, so the current consumption data of the 'P stage → D stage' section and the 'D stage → P stage' section are combined to P/R/N/D determine the correct position of

Therefore, it is possible to clearly determine the exact position of each position of P/R/N/D by combining the moving speed and current consumption characteristics of the actuator with the movement from 'P stage → D stage' and 'D stage → P stage' movement. there is.

From the above results, in the present invention, the amount of current consumed by the drive motor and the feed speed of the actuator 30 for all shift stages are derived as elements for detecting the constant value of each shift stage, and the learning function is used to reduce the consumption of the drive motor A section in which the amount of current decreases and the moving speed of the actuator 30 decreases at the same time is determined as the front end position of each shift stage and learned.

In particular, as described above, in the present invention, the actuator 30 reciprocates in all shift stages, thereby reducing the current consumption based on the current consumption at each shift stage and the moving speed of the actuator 30, and at the same time, The section in which the moving speed decreases is detected and learned as the top position of each shift stage. This has the advantage of being able to accurately detect and learn the end unit of each shift stage in that two factors are used as determining factors. There is an advantage in that more precise control is possible by learning the data obtained by detecting all the constant values of each shift stage together with the top end position.

In the learning method according to the present invention configured as described above, the actuator 30 reciprocates through all gear stages before the SCU performs gear shifting, determines and learns the regular value of each gear stage by itself, Complementarity can be improved so that smooth control can be performed even in the case of mechanical shape deformation according to the present invention.

In addition, since the present invention judges the regular unit value according to the shape by itself through the learning function, tolerance can be afforded, and the effect of absorbing poor dispersion can be expected, and even if mechanical shape changes occur, normal control or failure detection As a result, vehicle safety can be improved.

As such, the present invention has been described with reference to one embodiment shown in the drawings, but this is only exemplary, and those skilled in the art can make various modifications and equivalent other embodiments therefrom. will understand

Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

10: detent plate
20: detent spring
30: actuator

Claims (3)

delete In the method for learning the regular unit value of the gear shift actuator 30 according to the driving of the 4-stage detent plate 10 and the detent spring 20,
(a) before gear shifting, moving the actuator 30 back and forth to all shift stages (S100);
(b) measuring a current value generated when the actuator 30 moves at the same torque by controlling a constant duty and a moving speed of the actuator 30 (S200); and
(c) determining and learning the regular value of all shift stages based on the current value measured in step (b) and the moving speed of the actuator 30 (S300); and ,
Current consumption is reduced and the moving speed of the actuator 30 is increased based on the measured current value and the moving speed of the actuator 30 as the regular unit value of each gear shift learned in step (c) (S300). The front end position learning method of the gear shift actuator, characterized in that the section.
According to claim 2,
The current consumption is measured by measuring the current of the driving motor through the driving of the 4-stage detent plate 10 and the detent spring 20,
The moving speed of the actuator 30 is measured through a position sensor or a phase sensor and detecting the position of the actuator 30 according to the current change time. Method for learning the front end position of a gear shift actuator.