KR20110055854A - Navigation system for performing route guidance of curve section by using curvature in curve section and vehicle speed, and route guiding method thereof - Google Patents

Abstract

PURPOSE: A navigation system which guides a curve section based on the curvature of the curve section and vehicle speed and a path guide method thereof are provided to continuously offer safety speed in a curve section by determining the safety of a centrifugal force calculated from the vehicle speed and the curvature of the curve section. CONSTITUTION: A navigation system comprises a vehicle speed sensor(10), a map data storage unit(20), a GPS(Global Positioning System) module(40), a control unit(30), and an output unit. The vehicle speed detects the current speed of a vehicle and outputs speed information of the vehicle. The map data storage unit stores a digital map composed of road information, a background map, and facility information, and the map data storage unit contains the start and end positions of a curve section in the digital map, coordinate information about the curve section, and curvature information about the curve section. The GPS module receives a position signal from a GPS satellite to compute the current position of the vehicle and provide the coordinates of the computed position as vehicle position information. The control unit implements path setting and path guide functions by a driver using the vehicle position information from the GPS module and the digital map from the map data storage unit and computes a centrifugal force of the curve section using the curvature information. The output unit delivers guide messages from the control unit to the driver through voices and a screen.

Description

NAVIGATION SYSTEM FOR PERFORMING ROUTE GUIDANCE OF CURVE SECTION BY USING CURVATURE IN CURVE SECTION AND VEHICLE SPEED, AND ROUTE GUIDING METHOD THEREOF}

The present invention relates to a navigation system of a vehicle and a method for guiding a route thereof, and more particularly, to store coordinate information of a curve section of a road and curvature information of each curve section in advance, and to store the current speed of the vehicle and curvature information of a curve section. The present invention relates to a navigation system for guiding a safe speed in a curve section by calculating centrifugal force, and a path guidance method thereof.

Navigation systems for route guidance of vehicles and the like are widely used to cope with complicated road conditions to achieve safe driving. The navigation system incorporates a Global Positioning System (GPS) receiver and stores updatable road information data. The navigation system detects the current position of the vehicle from the satellite signal received through the GPS receiver and guides the route to the destination set by the user using the pre-stored road information data and the current position of the vehicle.

The navigation system guides the route to the destination and simultaneously provides guidance on other hazards necessary for safe driving. For example, the navigation system also guides supplementary information such as tunnels, bridges, curve sections, speed camera positions, and so on.

For example, the guidance of the curve section, for example, the map data maker measures the curvature of the road at the time of creating the map data, and if the curvature is more than a certain value, the map data maker determines the curve section and provides information on the existence of the curve section. Recorded as auxiliary information of the data. Accordingly, when the vehicle reaches the curve section, the navigation system detects the presence of the curve section from the map data information and outputs a voice message or displays a voice message such as "There is a curve section ahead. Please drive carefully". Print a guide message to.

However, in the conventional route guidance method of the navigation system, since the determination of the curve section is made arbitrarily by the map data maker, the variability in the degree of the curve felt by the driver despite the guidance message by the navigation system. This is big. For example, the curvature of the curve experienced by the driver may be larger or smaller than expected. This is because the existing curve section guidance method only guides the existence of the curve section and does not guide the curve section considering the curvature of the curve section and the current speed of the vehicle.

That is, since the centrifugal force in the curve section is determined by the curvature of the curve section and the current speed of the vehicle, even if the curvature of the curve section is small, if the current speed of the vehicle is high, the risk of an accident in the curve section may be increased.

Therefore, in order to achieve safe driving of the vehicle, in navigating the curve section in the navigation system, it is required to guide the route in consideration of the curvature of the curve section and the current speed of the vehicle, instead of simply guiding the existence of the curve section. .

The present invention is to solve the above-described technical problem, and pre-store the coordinate information of the curve section of the road and the curvature information of each curve section, calculate the centrifugal force by using the current speed of the vehicle and the curvature information of the curve section, By determining whether the calculated centrifugal force is a safe level, an object of the present invention is to provide a navigation system and a path guidance method capable of continuously presenting a safe speed in a curve section.

According to an aspect of the present invention, a navigation system for performing a curve section path guide using a curvature of a curve section and a vehicle speed includes: a vehicle speed sensor configured to detect a current speed of the vehicle and output the vehicle as speed information of the vehicle; A map data storage unit for storing an electronic map consisting of road information, background map, and facility information, wherein the electronic map includes coordinate information about a curve start position, a curve end position, and a curve section position, and a curvature of the curve section. A map data storage unit including curvature information; A GPS module which receives a satellite position signal from a GPS satellite to calculate a current position of the vehicle and provides the calculated position coordinates as position information of the vehicle; By using the position information of the vehicle provided from the GPS module and the electronic map provided from the map data storage unit, a route setting function by a driver's operation and a guide function of a set route are performed, and at the same time, Using the speed information, the coordinate information of the curve section and the curvature information of the curve section provided from the map data storage unit, the centrifugal force of the curve section is calculated, and it is determined whether the calculated centrifugal force is a safe level. A controller guiding the; And output means for informing the driver of a guide message output from the controller through a voice and a screen.

In addition, the curve section path guidance method using the curvature of the curve section and the vehicle speed according to the present invention, (a) determining whether the current position of the vehicle is the curve start position; (b) detecting the current speed of the vehicle from the speed information of the vehicle provided from the vehicle speed sensor, and detecting the curvature data of the current curve section from the coordinate information and the curvature information provided from the map data storage unit; (c) calculating the centrifugal force in the current curve section using the current speed of the vehicle and the curvature data of the curve section detected in step (b); (d) comparing the centrifugal force calculated in step (c) with a safe centrifugal force reference value; (e) in the step (d), when the current centrifugal force is less than the safe centrifugal force reference value, presenting a preset recommended speed of the corresponding vehicle through a guide message; (f) outputting a deceleration message to reduce the current speed when the current centrifugal force is greater than the safety centrifugal force reference value in step (d); And (g) determining whether the current position of the vehicle is the curve end position, and outputting a guide message indicating that the vehicle has passed the curve section in the case of the curve end position.

According to the present invention, the coordinate information of the curve section of the road and the curvature information of each curve section are stored in advance, and the centrifugal force is calculated using the current speed of the vehicle and the curvature information of the curve section. By guiding the safe speed of the vehicle, it is possible to continuously present the safe speed to the driver when entering the curve, and contribute to the safe driving by suggesting the optimum speed for driving the curve in the curve section.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various different forms, and only the embodiments are intended to complete the disclosure of the present invention and to those skilled in the art. It is provided for complete information.

First, the principle of route guidance applied to the present invention will be described with reference to FIG. 1. 1 is a conceptual diagram illustrating the principle of a route guidance method in consideration of the curvature of the curve section and the vehicle speed according to an embodiment of the present invention.

The path guidance method according to an embodiment of the present invention is applied to a curved section having curvature, as shown in FIG. 1. In order to apply the route guidance method according to an embodiment of the present invention for a curve section, a process of defining a curve section among various road sections, measuring the position and curvature of the curve section, and adding such information to the map data must be preceded. Needs to be.

For example, a map data manufacturer defines a section where the curvature of the road is above a certain threshold as a curve section, coordinate information about the curve start position, the curve end position, and the position of the curve section, and the curvature of the curve section. Add information to map data. Here, the curve start position indicates the start coordinates of the first curve section among all the divided curve sections, the curve end position indicates the start coordinates of the last curve section among the whole curve sections, and the positions of the curve sections are each divided into a plurality of sections. Represents the starting coordinate of the curve section. These definitions of terms of the present invention are only one example and may be appropriately modified according to the embodiment to which the present invention is applied.

The threshold value for determining the curve section is a reference value used when determining the road section as the curve section, and may be determined through experiments on how much curvature may interfere with safe driving. In this case, the map data maker may divide the curve section into a plurality of sections as needed, as shown in FIG. 1. The addition of the coordinate information and the curvature information of the curve section to the map data may be implemented by, for example, indexing the information to be added to the corresponding coordinates of the map data.

The map data maker adds the coordinate information and curvature information for the curve section to the map data as described with reference to FIG. 1, and when such map data is uploaded to the navigation system, the navigation system is connected to the current speed of the vehicle. The centrifugal force of the curve section is calculated using the curvature information of the curve section. The navigation system determines whether the calculated centrifugal force is a safe level, and from the determination result, when the centrifugal force due to the current speed of the vehicle and the curvature of the curve section is not a safe level, a guidance message for deceleration is sent to the driver. Output The path guidance of the curve section is continued for each curve section from the start position to the end position of the curve section.

Next, a navigation system according to an embodiment of the present invention will be described with reference to FIG. 2. 2 is a schematic diagram of a navigation system for performing route guidance in consideration of curvature of a curve section and vehicle speed according to an exemplary embodiment of the present invention.

As shown in FIG. 2, the navigation system according to an embodiment of the present invention includes a vehicle speed sensor 10, a map data storage unit 20, a control unit 30, a GPS module 40, a speaker 61, and a display ( 62).

The vehicle speed sensor 10 detects the current speed of the vehicle in the form of a pulse and outputs the speed information of the vehicle.

The map data storage unit 20 stores an electronic map, and the electronic map includes road information including information such as the shape of a road and traffic regulation, a background map indicating a shape drawn on the map, and a feature for searching. It includes information on various facilities such as buildings, parks, schools, hospitals, government offices and department stores. As described above, the map data storage unit 20 includes coordinate information about a curve start position, a curve end position, a curve section position, and the like, and curvature information about the curvature of the curve section. It is added to the corresponding coordinates of the map data by indexing or the like.

The GPS module 40 includes functions of a GPS antenna and a GPS receiver, receives a satellite position signal from the GPS satellite 50, calculates a current position of the vehicle, and provides the position information of the vehicle.

The control unit 30 uses general location information such as a route setting function by a driver's operation and a guide of a set route by using the location information of the vehicle provided from the GPS module 40 and the electronic map provided from the map data storage unit 20. Along with the function, it performs the path guidance function of the curve section as proposed in the present invention.

Referring to the route guidance of the curve section proposed in the present invention in more detail, the controller 30 is the current speed of the vehicle provided from the vehicle speed sensor 10 and the curvature of the curve section provided from the map data storage unit 20. Calculate the centrifugal force of the curve section using the information.

Next, the control unit 30 determines whether the centrifugal force calculated as described above is a safe level, and from the determination result, when the centrifugal force due to the current speed of the vehicle and the curvature of the curve section is not a safe level, a guide message for deceleration is performed. To the driver. The path guidance of the curve section is continued for each curve section from the start position to the end position of the curve section.

The controller 30 outputs the voice guidance message to the driver through the speaker 61 as a result of the route guidance, and visually outputs the map information and various information related to the traffic regulation to the driver through the display 62. .

Next, the process of the route guidance method performed by the controller 30 of FIG. 2 will be described in more detail with reference to FIG. 3.

3 is a flowchart illustrating a process of the route guidance method considering the curvature of the curve section and the vehicle speed according to an embodiment of the present invention.

The flowchart of FIG. 3 constitutes a part of the route guidance routine executed by the navigation system, and may be performed when the road under route guidance is particularly a curve section.

When the operation is started, in order to check whether the road on which the vehicle is currently traveling on the route guidance is a curve section, the controller 30 determines whether the current position of the vehicle is the curve start position (S10). This step may be performed by the controller 30 comparing the coordinates of the current position of the vehicle provided from the GPS module 40 with the coordinates of the curve start position provided from the map data storage 20.

If it is determined in step S10 that the current position of the vehicle is the curve start position, the controller 30 detects the current speed of the vehicle from the speed information of the vehicle provided from the vehicle speed sensor 10 (S12). If the current position of the vehicle in the step S10 is not the curve start position, the step S10 is repeated.

After detecting the current speed of the vehicle in the step S12, the control unit 30 detects the curvature data of the current curve section from the coordinate information and the curvature information provided from the map data storage unit 20 (S14).

Next, the control unit 30 calculates the centrifugal force in the current curve section by using the current speed of the vehicle and the curvature data of the curve section detected in the steps S12 and S14 (S16). Centrifugal force can be calculated by the following equation (1).

Centrifugal force = MV × curvature

Curvature = 1 / R

Where M is the weight of the vehicle, V is the speed of the vehicle, and R is the radius of the curved road. As described above, the curvature is measured by the map data maker for each curve section in advance and added for each coordinate of the position of the curve section.

After calculating the centrifugal force in the step S16, the control unit 30 determines whether the calculated current centrifugal force is less than the safety centrifugal force reference value (S18). The safety centrifugal force reference value may be determined as the minimum value of the centrifugal force for which safety is ensured by evaluating on a road by vehicle.

If the current centrifugal force is less than the safety centrifugal force reference value in step S18, the control unit S20 retrieves the preset recommended speed of the vehicle and guides the recommended speed through the speaker 61 and the display 62. Output a message (S20).

If the current centrifugal force is greater than the safety centrifugal force reference value in step S18, the control unit 20 outputs a deceleration message for reducing the current speed through the speaker 61 and the display 62 (S22).

After the steps S20 and S22 are completed, in order to confirm whether the curve section is completed, the controller 20 determines whether the current position of the vehicle is the curve end position (S24). This step may be performed by the controller 30 comparing the coordinates of the current position of the vehicle provided from the GPS module 40 with the coordinates of the curve end position provided from the map data storage 20.

If it is determined in step S24 that the current position of the vehicle is the curve end position, the controller 30 outputs a guidance message indicating that the vehicle has passed the curve section through the speaker 61 and the display 62 (S30). ).

In step S24, when it is determined that the current position of the vehicle is not the end of the curve, the controller 30 detects the curvature data of the next curve section from the coordinate information and the curvature information provided from the map data storage unit 20. (S26).

Next, the controller 30 compares the curvature data of the next curve section detected in the step 26 and the curvature data of the current curve section detected in the step S14 to see if there is a curvature change between the two curve sections. Determine for (S28).

In step S28, if it is determined that there is a curvature change between the current curve section and the next curve section, the processing flow jumps to step S12, otherwise jumps to step S24. That is, the controller 30 repeats the operations of steps S12 to S20 and S22 to recalculate the centrifugal force if there is a curvature change in the next curve section, and performs additional work if there is no curvature change in the next curve section. Instead, it determines only whether the next curve section is the curve end position.

Finally, after the guide message indicating that the curve section has been passed by step S30, the path guidance routine in the curve section ends.

According to the present invention described above, the coordinate information of the curve section of the road and the curvature information of each curve section are stored in advance, the centrifugal force is calculated using the current speed of the vehicle and the curvature information of the curve section, and the calculated centrifugal force is applied to the calculated centrifugal force. By guiding the safe speed in the curve section on the basis, it is possible to continuously present the safe speed to the driver at the time of entering the curve, and contribute to the safe driving by presenting the optimum speed for driving the curve in the curve section.

So far, the configuration and operation of the embodiment of the present invention have been described. The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims but also by the equivalents of the claims.

1 is a conceptual diagram illustrating the principle of a route guidance method in consideration of the curvature of the curve section and the vehicle speed according to an embodiment of the present invention.

2 is a schematic diagram of a navigation system for performing route guidance in consideration of curvature of a curve section and vehicle speed according to an exemplary embodiment of the present invention.

3 is a flowchart illustrating a process of the route guidance method considering the curvature of the curve section and the vehicle speed according to an embodiment of the present invention.

Claims (7)

A vehicle speed sensor that detects a current speed of the vehicle and outputs the vehicle as speed information of the vehicle; A map data storage unit for storing an electronic map consisting of road information, background map, and facility information, wherein the electronic map includes coordinate information about a curve start position, a curve end position, and a curve section position, and a curvature of the curve section. A map data storage unit including curvature information; A GPS module which receives a satellite position signal from a GPS satellite to calculate a current position of the vehicle and provides the calculated position coordinates as position information of the vehicle; By using the position information of the vehicle provided from the GPS module and the electronic map provided from the map data storage unit, a route setting function by a driver's operation and a guide function of a set route are performed, and at the same time, Calculate the centrifugal force of the curve section by using the speed information, the coordinate information of the curve section and the curvature information of the curve section provided from the map data storage unit, and determine whether the calculated centrifugal force is a safe level to determine the safe speed in the curve section. A controller guiding the; And And output means for informing a driver of a guide message output from the controller through a voice and a screen. Navigation system for performing the curve section path guidance using the curvature of the curve section and the vehicle speed. The method of claim 1, Coordinate information about the curve start position, the curve end position, and the position of the curve section stored in the map data storage unit, and the curvature information about the curvature of the curve section are measured in advance by a map data manufacturer and stored in the map data storage unit. felled Navigation system for performing the curve section path guidance using the curvature of the curve section and the vehicle speed. The method of claim 2, Coordinate information and curvature information stored in the map data storage unit are added to the corresponding coordinates of the curve section by indexing. Navigation system for performing the curve section path guidance using the curvature of the curve section and the vehicle speed. The method of claim 1, The control unit compares the calculated centrifugal force with a safety centrifugal force reference value to determine whether the calculated centrifugal force is a safe level, and outputs a deceleration guidance message when the calculated centrifugal force is greater than the safety centrifugal force reference value. Navigation system for performing the curve section path guidance using the curvature of the curve section and the vehicle speed. (a) determining whether the current position of the vehicle is a curve start position; (b) detecting the current speed of the vehicle from the speed information of the vehicle provided from the vehicle speed sensor, and detecting the curvature data of the current curve section from the coordinate information and the curvature information provided from the map data storage unit; (c) calculating the centrifugal force in the current curve section using the current speed of the vehicle and the curvature data of the curve section detected in step (b); (d) comparing the centrifugal force calculated in step (c) with a safe centrifugal force reference value; (e) in the step (d), when the current centrifugal force is less than the safe centrifugal force reference value, presenting a preset recommended speed of the corresponding vehicle through a guide message; (f) outputting a deceleration message to reduce the current speed when the current centrifugal force is greater than the safety centrifugal force reference value in step (d); And (g) determining whether the current position of the vehicle is a curve end position, and outputting a guide message informing that the vehicle has passed the curve section in the case of the curve end position; Curve section path guidance method using curvature of curve section and vehicle speed. The method of claim 5, In the step (g), if the current position of the vehicle is not the end of the curve, Detecting curvature data of a next curve section from coordinate information and curvature information provided from the map data storage unit; Determining whether there is a curvature change between the detected curvature data of the next curve section and the curvature data of the current curve section; And If there is a change in curvature, jump to step (b) to recalculate the centrifugal force, and if there is no change in curvature, jumping to step (g) without performing further work. Curve section path guidance method using curvature of curve section and vehicle speed. The method of claim 5, The centrifugal force in the step (c) is calculated by the following equation Centrifugal force = MV × curvature Curvature = 1 / R (M is the weight of the car, V is the speed of the car, R is the radius of the curved road) Curve section path guidance method using curvature of curve section and vehicle speed.

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