KR102896006B1 - System and method for estimation vehicle seat - Google Patents

Abstract

A vehicle seat evaluation system and evaluation method are introduced, including a measuring device that applies a load to a seat to measure seat compression displacement; a collection unit that collects load and displacement data measured from the measuring device; a processing unit that fits the collected load and displacement data into a graph to derive a fitted graph, normalizes the fitted graph to derive a regular graph, and extracts a plurality of feature points from the regular graph; and a judgment unit that calculates an evaluation score of the seat based on the load values and displacement values of the feature points extracted by the processing unit.

Description

Vehicle Seat Evaluation System and Evaluation Method {SYSTEM AND METHOD FOR ESTIMATION VEHICLE SEAT}

The present invention relates to a vehicle seat evaluation system and evaluation method that applies a load to a seat to measure seat compression displacement, derives a graph using the measured load and displacement data to calculate the initial seating comfort, sinking feeling, and bottoming feeling scores of the seat, and evaluates the seat using the calculated scores.

Seats are an essential component of a vehicle, allowing passengers to drive the vehicle or relax in the passenger seat. These seats directly support the occupants' bodies, and since occupants often spend short or long periods of time in a vehicle, a more comfortable seat will enhance the ride and reduce driver fatigue.

The existing vehicle seat evaluation system can only analyze the simple seating comfort of the seat using a static load graph, and because it only analyzes the seating comfort of a single seat, it has the disadvantage of being difficult to compare the seating comfort between various seats from different manufacturers.

Therefore, there is a need to develop a system that quantifies not only the simple seating comfort but also the various sensations that passengers can feel when sitting on a seat, or evaluates seats with a standardized score across various seats from various manufacturers.

The matters described as background technology above are only intended to enhance understanding of the background of the present invention, and should not be taken as an admission that they correspond to prior art already known to those of ordinary skill in the art.

KR 10-1018394

The present invention has been proposed to solve such problems, and provides a vehicle seat evaluation system and evaluation method that applies a load to a seat to measure the seat compression displacement, derives a graph using the measured load and displacement data to calculate the initial seating comfort, sinking feeling, and bottoming feeling scores of the seat, evaluates the seat from various aspects using the calculated scores, and can comprehensively compare and evaluate various seats through a normalization process.

In order to achieve the above object, the vehicle seat evaluation system according to the present invention includes a measuring device that applies a load to the seat to measure the amount of seat pressing displacement; a collection unit that collects load and displacement data measured from the measuring device; a processing unit that fits the collected load and displacement data into a graph to derive a fitting graph, normalizes the fitting graph to derive a regular graph, and extracts a plurality of feature points from the regular graph; and a judgment unit that calculates an evaluation score of the corresponding seat through load values and displacement values of the feature points extracted by the processing unit.

The measuring device can apply a load to the seat seating surface through a load plate, change the load applied to the seat in steps, and measure the amount of seat compression displacement corresponding to each load.

The processing unit can use the collected load and displacement data to fit a graph in which the horizontal axis represents the displacement and the vertical axis represents the load, and then transform the graph to derive an initial graph in which the horizontal axis represents the load and the vertical axis represents the displacement.

The processing unit can derive a fitting graph by fitting the displacement value per unit load (ds/df, where s is the displacement and f is the load) at the moment when the load is applied from each line of the initial graph to a graph.

The processing unit can normalize the fitting graph with respect to the collected displacement data to derive a regular graph.

A feature point may include a starting point or an end point of a regular graph or multiple inflection points.

The seat evaluation score may include an initial seating comfort score, a sinking feeling score, or a bottoming feeling score.

The characteristic points are the starting point of the regular graph and the first inflection point close to the starting point, and the initial seating comfort score can be calculated through the displacement value per unit load of the starting point and the load value of the first inflection point.

The characteristic points are the first inflection point close to the starting point of the regular graph and the second inflection point close to the first inflection point, and the difference in displacement per unit load between the second inflection point and the first inflection point and the difference in load between the second inflection point and the first inflection point can be used to calculate the sense of sagging.

The characteristic points are the end points of the regular graph and the second inflection point close to the end points, and the bottom score can be calculated through the difference in displacement per unit load between the end point and the second inflection point and the difference in load between the end point and the second inflection point.

In order to achieve the above object, the vehicle seat evaluation method according to the present invention includes a measuring step of applying a load to the seat to measure the seat pressing displacement amount; a collecting step of collecting the measured load and displacement data from a measuring device; a processing step of fitting the collected load and displacement data in the form of a graph to derive a fitted graph, normalizing the fitted graph to derive a regular graph, and extracting a plurality of feature points from the regular graph; and a judgment step of calculating an evaluation score of the corresponding seat through the load values and displacement values of the feature points extracted by the processing unit.

In the measurement stage, a load is applied through a load plate on the seat cushion, the load applied to the seat is changed in stages, and the amount of seat compression displacement at each load application can be measured.

In the processing step, an initial graph is derived using the collected load and displacement data, in which the horizontal axis represents the load and the vertical axis represents the displacement amount, and the displacement value per unit load (ds/df, where s is the displacement amount and f is the load) at the moment the load is applied is fitted to a graph from each line of the initial graph to derive a fitted graph, and the fitted graph is normalized with respect to the collected displacement data to derive a normal graph.

In the judgment step, the evaluation score of the seat, including the initial seating feeling score, the sinking feeling score, or the bottoming feeling score, can be calculated through feature points including the starting point or the end point or multiple inflection points of the regular graph.

According to the vehicle seat evaluation system and evaluation method of the present invention, a load is applied to the seat to measure the seat pressing displacement, and a graph is derived using the measured load and displacement data to calculate the initial seating comfort, sinking feeling, and floor feeling scores of the seat, and the seat is evaluated from various aspects through the calculated scores, and various seats can be comprehensively compared and evaluated through a normalization process.

FIG. 1 is a configuration diagram of a vehicle seat evaluation system according to one embodiment of the present invention.
FIG. 2 is a diagram illustrating a process of deriving a regular graph from an initial graph in a vehicle seat evaluation system according to one embodiment of the present invention.
FIG. 3 is a diagram showing a graph of a plurality of seats normalized into a regular graph in a vehicle seat evaluation system according to one embodiment of the present invention.
FIG. 4 is a diagram showing each feature point of a regular graph in a vehicle seat evaluation system according to one embodiment of the present invention.
FIG. 5 is a drawing showing the results of evaluating a seat using a vehicle seat evaluation system according to one embodiment of the present invention.
Figure 6 is a flowchart of a vehicle seat evaluation method according to one embodiment of the present invention.

FIG. 1 is a block diagram of a vehicle seat evaluation system according to one embodiment of the present invention. FIG. 2 is a diagram showing a process of deriving a regular graph from an initial graph in a vehicle seat evaluation system according to one embodiment of the present invention. FIG. 3 is a diagram showing a regular graph by normalizing graphs for a plurality of seats in a vehicle seat evaluation system according to one embodiment of the present invention. FIG. 4 is a diagram showing each feature point of a regular graph in a vehicle seat evaluation system according to one embodiment of the present invention. FIG. 5 is a diagram showing the results of evaluating a seat through a vehicle seat evaluation system according to one embodiment of the present invention. FIG. 6 is a flowchart of a vehicle seat evaluation method according to one embodiment of the present invention.

FIG. 1 is a block diagram of a vehicle seat evaluation system according to one embodiment of the present invention. The vehicle seat evaluation system according to one embodiment of the present invention includes a measuring device (100) that applies a load to a seat to measure a seat pressing displacement amount; a collection unit (200) that collects load and displacement data measured from the measuring device (100); a processing unit (300) that fits the collected load and displacement data into a graph to derive a fitting graph, normalizes the fitting graph to derive a regular graph, and extracts a plurality of feature points from the regular graph; and a judgment unit (400) that calculates an evaluation score of the corresponding seat through load values and displacement values of the feature points extracted by the processing unit (300).

In addition, in a vehicle seat evaluation system according to one embodiment of the present invention, the measuring device (100) can apply a load to a seat seating surface through a load plate, change the load applied to the seat in stages, and measure the amount of seat compression displacement corresponding to each load.

Specifically, the vehicle seat evaluation system and evaluation method according to one embodiment of the present invention automatically evaluates each item by dividing the seat seating feel into three categories: initial seating feel, sinking feel, and floor feel. The measuring device (100) changes the seat load from 0 kgf to 55 kgf in 0.1 kgf units and measures the pressing displacement of the seat corresponding to each load. The measured data is input into the system through the collection unit (200), and then goes through graph fitting, differentiation, and standardization processes in the processing unit (300), extracts feature points necessary for score calculation, and finally, the judgment unit (400) calculates a score for each item, thereby enabling quantitative evaluation of the seat feeling.

FIG. 2 is a diagram illustrating a process of deriving a regular graph from an initial graph in a vehicle seat evaluation system according to an embodiment of the present invention. In the vehicle seat evaluation system according to an embodiment of the present invention, the processing unit (300) may fit a graph in which the horizontal axis represents the displacement amount and the vertical axis represents the load using the collected load and displacement data, and may derive an initial graph in which the horizontal axis represents the load and the vertical axis represents the displacement amount by axis conversion. In addition, in the vehicle seat evaluation system according to an embodiment of the present invention, the processing unit (300) may derive a fitted graph by fitting a displacement value per unit load (ds/df, where s is the displacement amount and f is the load) at the moment when the load is applied from each line of the initial graph.

Specifically, referring to FIG. 2, the processing unit (300) first fits a graph in which the horizontal axis represents the displacement and the vertical axis represents the load using the collected load and displacement data, and then transforms the axis to derive a graph in which the horizontal axis represents the load and the vertical axis represents the displacement. Since the derived graph is composed of discontinuous data, the processing unit (300) derives a graph composed of continuous data again through the polynomial regression method. The processing unit (300) selects the regression analysis order with the best performance when applying the polynomial regression method to finally derive the fitted graph.

FIG. 3 is a diagram illustrating a normalized graph representing a graph for multiple seats in a vehicle seat evaluation system according to one embodiment of the present invention. In the vehicle seat evaluation system according to one embodiment of the present invention, the processing unit (300) can derive a normalized graph by normalizing a fitting graph with respect to the collected displacement data. When the fitting graph is normalized as shown in FIG. 3, a standardized score can be calculated by comprehensively evaluating various types of seats, thereby enabling a relative emotional evaluation between various types of seats.

Specifically, the regular graph is derived by applying the following regularization equation to the fitting graph:

At this time, different types of sheets are normalized for each displacement data measured for each type of sheet, and thus, each normal graph is derived through a different normalization equation for each type of sheet.

FIG. 4 is a diagram showing each characteristic point of a regular graph in a vehicle seat evaluation system according to an embodiment of the present invention. In the vehicle seat evaluation system according to an embodiment of the present invention, the characteristic point may include a starting point (P start), an ending point (P end), or a plurality of inflection points (P pad, P, spring) of a regular graph. In addition, in the vehicle seat evaluation system according to an embodiment of the present invention, the evaluation score of the seat may include an initial seating comfort score, a sinking feeling score, or a bottoming feeling score. The determination unit (400) calculates the initial seating comfort score, the sinking feeling score, and the bottoming feeling score, respectively, through the load values and displacement values of the starting point (P start), the ending point (P end), and a plurality of inflection points (P pad, P, spring) of the regular graph.

Meanwhile, in a vehicle seat evaluation system according to one embodiment of the present invention, the characteristic points are a starting point (P start) of a regular graph and a first inflection point (P pad) close to the starting point, and an initial seating comfort (ICF) score can be calculated through a displacement value per unit load of the starting point (P start) and a load value of the first inflection point (P pad).

The initial seating comfort score is determined by the following equation:

Each variable a, b, and c will be determined through sheet emotional evaluation.

The initial seating comfort is determined by the degree to which the covering and ramie are pressed on the seat. The softer the covering material (M early increases), and the softer the covering and ramie are and the more they are pressed (D early increases), the better it is evaluated.

In a vehicle seat evaluation system according to one embodiment of the present invention, the characteristic points are a first inflection point close to the starting point of a regular graph and a second inflection point close to the first inflection point, and a sinking feeling (SF) score can be calculated through a difference in displacement values per unit load between the second inflection point and the first inflection point and a difference in load values between the second inflection point and the first inflection point.

The off-feel score is determined by the following equation:

Each variable d, e, and f will be determined through sheet emotional evaluation.

The feeling of being off is determined by the degree to which the covering, lamy and pad are pressed on the sheet, and the more the pad is pressed (increasing M pad) and the faster the pad is pressed (increasing D pad), the more the feeling of being off is evaluated.

In a vehicle seat evaluation system according to one embodiment of the present invention, the characteristic points are the end points of a regular graph and the second inflection point close to the end points, and the floor feeling (GF) score can be calculated through the difference in displacement per unit load between the end point and the second inflection point and the difference in load value between the end point and the second inflection point.

The floor score is determined by the following equation:

Each variable g, h, and i will be determined through sheet emotional evaluation.

The floor feel is determined by the degree to which the covering, lamy, pad, and spring are pressed on the seat. The less elastic the spring feels (increase M spring) and the longer the spring sags (increase D spring), the more floor feel is felt.

FIG. 5 is a diagram showing the results of evaluating a seat through a vehicle seat evaluation system according to an embodiment of the present invention. The vehicle seat evaluation system according to an embodiment of the present invention can be ultimately implemented through N-SFC (New Normalized Seating Feel Curve) seat seating comfort evaluation software, and the software can display the input step (210), the analysis step (310), the fitting step (320), and the result step (410) in a single window through the vehicle seat evaluation system according to an embodiment of the present invention. When the vehicle seat evaluation system according to an embodiment of the present invention is used, various types of seats can be evaluated and compared by scoring the initial seating comfort, sinking feeling, and flooring feeling according to a single standardized standard, and the seat design can be easily modified or supplemented using the evaluation results if the designed seat is insufficient or needs to be supplemented in any of the initial seating comfort, sinking feeling, or flooring feeling.

FIG. 6 is a flowchart of a vehicle seat evaluation method according to an embodiment of the present invention. The vehicle seat evaluation method according to an embodiment of the present invention includes a measuring step (S100) of applying a load to a seat to measure a seat compression displacement amount; a collecting step (S200) of collecting load and displacement data measured from a measuring device; a processing step (S300) of fitting the collected load and displacement data into a graph to derive a fitting graph, normalizing the fitting graph to derive a regular graph, and extracting a plurality of feature points from the regular graph; and a judgment step (S400) of calculating an evaluation score of the corresponding seat based on the load values and displacement values of the feature points extracted by the processing unit. After the judgment step (S400), an evaluation step (S500) of evaluating the corresponding seat based on the finally calculated evaluation score may be further included.

In addition, in the vehicle seat evaluation method according to one embodiment of the present invention, in the measuring step (100), a load is applied through a load plate on the seat cushion, the load applied to the seat is changed in stages, and the amount of seat pressing displacement at each load application is measured.

Meanwhile, in the vehicle seat evaluation method according to one embodiment of the present invention, in the processing step (S300), an initial graph is derived using the collected load and displacement data, in which the horizontal axis represents the load and the vertical axis represents the displacement amount, and the displacement value per unit load (ds/df, where s is the displacement amount and f is the load) at the moment the load is applied is fitted to a graph from each line of the initial graph to derive a fitting graph, and the fitting graph is normalized with respect to the collected displacement data to derive a regular graph.

In addition, in the vehicle seat evaluation method according to one embodiment of the present invention, in the judgment step (S400), an evaluation score of the seat including an initial seating comfort score, a sinking feeling score, or a floor feeling score can be calculated through a feature point including a starting point or an ending point or a plurality of inflection points of a regular graph.

Meanwhile, in the evaluation stage (S500), the seat is evaluated through the calculated initial seating comfort score, sinking feeling score, or bottoming feeling score, so that feedback can be provided on areas to be improved in terms of initial seating comfort, sinking feeling, and bottoming feeling for each seat, and the initial seating comfort, sinking feeling, and bottoming feeling scores can also be compared and evaluated between various types of seats.

Although the present invention has been illustrated and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that the present invention may be variously improved and modified without departing from the technical spirit of the present invention as defined by the following claims.

100: Measuring device 200: Collection unit
300: Processing Unit 400: Judgment Unit

Claims (14)

A measuring device that measures the displacement of a sheet by applying a load to the sheet;
A collection unit that collects load and displacement data measured from a measuring device;
A processing unit that fits the collected load and displacement data into a graph to derive a fitting graph, normalizes the fitting graph to derive a regular graph, and extracts multiple feature points from the regular graph; and
It includes a judgment unit that calculates the evaluation score of the corresponding sheet through the load values and displacement values of the feature points extracted from the processing unit;
The feature points extracted from the processing unit are the starting point of the regular graph and the first inflection point close to the starting point.
A vehicle seat evaluation system characterized in that the judgment unit calculates an initial seating comfort score through a displacement value per unit load at a starting point and a load value at a first inflection point. In claim 1,
A vehicle seat evaluation system characterized in that the measuring device applies a load to the seat seating surface through a load plate, changes the load applied to the seat in stages, and measures the amount of seat compression displacement corresponding to each load. In claim 1,
A vehicle seat evaluation system characterized in that the processing unit uses the collected load and displacement data to fit a graph in which the horizontal axis represents displacement and the vertical axis represents load, and then transforms the graph to derive an initial graph in which the horizontal axis represents load and the vertical axis represents displacement. In claim 3,
A vehicle seat evaluation system characterized in that the processing unit derives a fitting graph by fitting the displacement value per unit load (ds/df, where s is the displacement amount and f is the load) at the moment when the load is applied from each line of the initial graph into a graph. In claim 1,
A vehicle seat evaluation system characterized in that the processing unit normalizes the fitting graph with respect to the collected displacement data to derive a normal graph. In claim 1,
A vehicle seat evaluation system characterized in that a feature point includes a starting point or an end point or multiple inflection points of a regular graph. In claim 1,
A vehicle seat evaluation system characterized in that the seat evaluation score includes an initial seating comfort score, a sinking feeling score, or a flooring feeling score. delete A measuring device that measures the displacement of a sheet by applying a load to the sheet;
A collection unit that collects load and displacement data measured from a measuring device;
A processing unit that fits the collected load and displacement data into a graph to derive a fitting graph, normalizes the fitting graph to derive a regular graph, and extracts multiple feature points from the regular graph; and
It includes a judgment unit that calculates the evaluation score of the corresponding sheet through the load values and displacement values of the feature points extracted from the processing unit;
The feature points extracted from the processing unit are the first inflection point close to the starting point of the regular graph and the second inflection point close to the first inflection point.
A vehicle seat evaluation system characterized in that the judgment unit calculates a feeling of sagging by using the difference in displacement values per unit load between the second inflection point and the first inflection point and the difference in load values between the second inflection point and the first inflection point. A measuring device that measures the displacement of a sheet by applying a load to the sheet;
A collection unit that collects load and displacement data measured from a measuring device;
A processing unit that fits the collected load and displacement data into a graph to derive a fitting graph, normalizes the fitting graph to derive a regular graph, and extracts multiple feature points from the regular graph; and
It includes a judgment unit that calculates the evaluation score of the corresponding sheet through the load values and displacement values of the feature points extracted from the processing unit;
In the processing unit, the feature points are the end points of the regular graph and the second inflection point close to the end points.
A vehicle seat evaluation system characterized in that the judgment unit calculates a floor feeling score through the difference in displacement per unit load between the end point and the second inflection point and the difference in load value between the end point and the second inflection point. delete delete delete delete