Automotive speed limit and safe distance control system and method

Abstract

This invention proposes a vehicle speed limit and safe following distance control system and method, relating to the field of vehicle control technology. It includes a controller for determining whether the distance between the vehicle and the vehicle in front is too close; if so, it sends a deceleration command to a speed control device; it also determines whether the distance to the vehicle behind is too close during deceleration, or whether the distance to the vehicle in front remains too close even after the speed has been reduced to a set value; if at least one of these conditions is met, it issues a warning signal to remind the driver to stop decelerating and change lanes; and a speed control device for receiving the deceleration command and performing the deceleration operation. This invention comprehensively considers the safe distance between the vehicle and the vehicle in front, road conditions, and the safe distance to the vehicle behind. When it detects that the distance to the vehicle in front is too close, it first performs a deceleration operation. If the distance to the vehicle in front remains too close even after the speed has been reduced to a set value, or if it detects that the distance to the vehicle behind is too close during the deceleration process, it then reminds the driver to stop decelerating and change lanes.

Description

Technical Field

[0001] This invention belongs to the field of automotive control technology, and particularly relates to a vehicle speed limiting and safe following distance control system and method. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] With the continuous development of society and the economy, and the gradual improvement of people's living standards, automobiles have become the main means of transportation in daily life. The safety of driving is also attracting increasing attention. When driving, especially on highways, it is necessary to adhere to the speed limits and maintain a safe distance from the vehicle in front. If the vehicle in front suddenly slows down and your vehicle is close enough, the principle of "yielding speed, not lane" should be followed. The driver's usual action is to first reduce speed. If speed is not reduced in time, a collision or rear-end collision may occur, threatening the driver's personal safety.

[0004] With breakthroughs in the field of artificial intelligence, autonomous driving technology and functions are developing in a diversified manner. Modern cars often use multiple high-precision sensors to achieve intelligent driving functions. Based on these high-precision sensors, and with the help of actuators, high-precision maps, and GPS positioning, many functions can be achieved to free the driver's hands and feet.

[0005] The inventors discovered that existing technologies include methods for monitoring the distance between a vehicle and the vehicle in front and for controlling the vehicle's speed reduction. For example, Chinese invention patent application CN 108973854 A discloses a system and method for preventing vehicle traffic accidents. This system calculates the safe following distance by combining the vehicle's kinetic energy and preset braking parameters, then determines whether the distance to the vehicle in front is less than the safe following distance. If the distance is determined to be less than the safe following distance, the system prompts the driver to reduce speed. It also determines whether the vehicle speed has decreased, and if it is determined that the speed has not decreased, it forcibly reduces the vehicle speed until the distance to the vehicle in front is greater than the safe following distance.

[0006] However, if a car traveling at high speed suddenly slows down until the distance between it and the vehicle in front exceeds a safe distance, there is a risk of a series of rear-end collisions caused by the rapid deceleration. Therefore, simply using speed reduction as a means to maintain a safe distance from the vehicle in front still leaves room for improvement in terms of driving safety. Summary of the Invention

[0007] To overcome the shortcomings of the prior art, the present invention provides a vehicle speed limit and safe distance control system and method, which comprehensively considers the safe distance between the vehicle and the vehicle in front, the road environment, and the safe distance between the vehicle and the vehicle behind. When it is detected that the distance to the vehicle in front is too close, the speed is reduced first. When the speed is reduced to the set value and the distance to the vehicle in front is still too close, or when it is detected that the distance to the vehicle behind is too close during the deceleration process, the driver is reminded to stop decelerating and change lanes.

[0008] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0009] The first aspect of the present invention provides a vehicle speed limit and safe following distance control system.

[0010] Vehicle speed limiting and safe following distance control system, including:

[0011] The controller is used to obtain the vehicle's speed, distance to the vehicle in front, and distance to the vehicle behind. It determines whether the distance between the vehicle and the vehicle in front is too close. If so, it sends a deceleration command to the vehicle speed control device. At the same time, it determines whether the distance to the vehicle behind is too close during the deceleration process, or whether the distance to the vehicle in front is still too close during the process of reducing the speed to the set value. When at least one of the above two situations is met, a reminder signal is issued to remind the driver to stop decelerating and change lanes.

[0012] The vehicle speed control device is used to receive speed reduction commands and perform speed reduction operations.

[0013] Optionally, the controller is also used for:

[0014] If it is determined that the distance between the vehicle and the vehicle behind remains at a safe distance during the deceleration process, the vehicle will decelerate according to the current lane until the speed is reduced to the set value.

[0015] Optionally, the controller is also configured to, when performing deceleration according to the current lane:

[0016] Once it is determined that the vehicle speed has reached the set value and the distance to the vehicle in front meets the safe distance requirement, the speed reduction command to the vehicle speed control device is stopped.

[0017] Optionally, the controller is also used for:

[0018] Determine if the vehicle has changed lanes; if so, stop sending deceleration commands to the vehicle speed control device.

[0019] Optional, also includes:

[0020] The information collection system is used to acquire information such as road speed limit signs, distances between vehicles and their speeds, and send this information to the controller.

[0021] The positioning system is used to obtain vehicle information and speed limit information on the current road and send them to the controller;

[0022] The controller is also used to determine the actual speed limit of the current road based on the received road speed limit sign information and speed limit information; and to obtain the actual distance of its own vehicle from the vehicle in front and the vehicle behind based on the distance and speed information between the vehicle in front and the vehicle behind, and the vehicle information of the current road.

[0023] Optionally, the controller is used to take the smaller value among the road speed limit sign information and the speed limit information as the actual speed limit value of the current road, and to take the smaller value among the distance information between the vehicle in front and the vehicle behind and the vehicle information of the current road as the actual distance of its own vehicle to the vehicle in front and the vehicle behind.

[0024] Optionally, the controller is also used to obtain the real-time speed of its own vehicle, determine whether the real-time speed of its own vehicle exceeds the actual speed limit of the current road, and if so, send a speed reduction command to the speed control device.

[0025] Optional, also includes:

[0026] The instrument display system receives information from the controller, including the vehicle's real-time speed, the current road speed limit, the vehicle's actual distance from the vehicle in front, and the distance from the vehicle behind, and displays the received information.

[0027] Optionally, the controller is also used to first send a reminder message to the alarm device when it determines that the real-time speed of its own vehicle exceeds the actual speed limit of the current road or that the distance between its own vehicle and the vehicle in front is too close, and only send a speed reduction command to the vehicle speed control device after determining that the driver has not taken a speed reduction action within a set time.

[0028] An alarm device is used to receive alert signals and issue voice reminders.

[0029] A second aspect of the present invention provides a method for controlling vehicle speed limits and safe following distances.

[0030] Methods for controlling vehicle speed limits and safe following distances include the following steps:

[0031] The controller acquires the vehicle's speed, distance to the vehicle in front, and distance to the vehicle behind. It determines whether the distance between the vehicle in front and the vehicle in front is too close. If so, it sends a deceleration command to the vehicle speed control device. At the same time, it determines whether the distance to the vehicle behind is too close during the deceleration process, or whether the distance to the vehicle in front is still too close during the process of reducing the speed to the set value. When at least one of the above two situations is met, it sends a reminder signal to the alarm device to remind the driver to stop decelerating and change lanes.

[0032] The vehicle speed control device receives a speed reduction command and performs a speed reduction operation.

[0033] The above one or more technical solutions have the following beneficial effects:

[0034] This invention improves the control logic for safe following distance in existing technologies. It takes into account multiple conditions, including the safe distance between the vehicle and the vehicle in front, road conditions, the safe distance between the vehicle and the vehicle behind, and the vehicle's speed, in conjunction with actual driving conditions. When it detects that the distance to the vehicle in front is too close, it first reduces the speed. If the distance to the vehicle in front is still too close after the speed is reduced to a set value, or if it detects that the distance to the vehicle behind is too close during the deceleration process, it reminds the driver to stop decelerating and change lanes. This changes the vehicle's active deceleration control to a driver-controlled mode, preventing the risk of rear-end collisions caused by only considering the distance to the vehicle in front when reducing speed, and improving the safety of vehicle control.

[0035] This invention embeds overspeed control into the control logic of safe following distance. When both overspeed and close following occur simultaneously, overspeed control is prioritized, and the overspeed control logic is executed to reduce the vehicle speed to below the speed limit, thereby reducing the severity of injury in the event of a collision.

[0036] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0037] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0038] Figure 1 This is a system structure diagram of the first embodiment. Detailed Implementation

[0039] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations of the present invention.

[0041] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0042] The overall concept proposed in this invention is as follows:

[0043] This invention proposes a vehicle speed limit and safe following distance control system and method. It uses a forward-looking multi-functional camera on the windshield and a high-precision radar to monitor the road conditions in front of the vehicle in real time. When there is a traffic speed limit sign in front of the vehicle, it identifies the speed limit value on it and combines it with the road speed limit information sent by the high-precision map. After processing and judgment by the controller, it reminds the driver through the instrument panel or sound when the vehicle is speeding. If the driver does not slow down, the vehicle speed control device can automatically perform a deceleration operation to actively reduce the speed of the vehicle.

[0044] Simultaneously, based on the vehicle's radar and front-view and rear-view multi-function cameras, it automatically judges the driving environment, monitors the speed and distance of the vehicle in front and the vehicle behind, and intelligently and automatically controls the vehicle speed. It dynamically adjusts the safe distance according to the distance between the vehicle in front and the vehicle itself. When the speed is reduced to the set value and the distance to the vehicle in front is still too close, or when the distance to the vehicle behind is detected to be too close during the deceleration process, it reminds the driver to stop decelerating and change lanes, thus improving the safety of driving control.

[0045] Example 1

[0046] This embodiment discloses a vehicle speed limit and safe following distance control system.

[0047] like Figure 1 As shown, the vehicle speed limit and safe following distance control system includes:

[0048] The controller is used to obtain the vehicle's speed, distance to the vehicle in front, and distance to the vehicle behind. It determines whether the distance between the vehicle and the vehicle in front is too close. If so, it sends a deceleration command to the vehicle speed control device. At the same time, it determines whether the distance to the vehicle behind is too close during the deceleration process, or whether the distance to the vehicle in front is still too close during the process of reducing the speed to the set value. When at least one of the above two situations is met, a reminder signal is issued to remind the driver to stop decelerating and change lanes.

[0049] The vehicle speed control device is used to receive speed reduction commands and perform speed reduction operations.

[0050] The overall control logic of this invention takes into account the vehicle's speed, distance to the vehicle in front, distance to the vehicle behind, and road conditions. When the vehicle is traveling at high speed and the distance to the vehicle in front is too close, if a rapid deceleration is performed, it will increase the risk of rear-end collisions. At the same time, rapid deceleration in poor road conditions will increase the risk factor of the vehicle itself.

[0051] Therefore, this embodiment combines active vehicle deceleration control with lane change reminders to the driver. During deceleration, if the driver of the following vehicle does not react in time, or if the following vehicle was already following too closely and the distance becomes too short after the vehicle decelerates, continued deceleration will lead to a rear-end collision. Taking into account the following vehicle's distance, when the distance becomes too short during deceleration, the driver should be reminded to change lanes. The driver should then make a flexible lane change based on the actual road conditions to avoid rear-end collisions caused by traveling in the same lane as both the vehicle in front and behind.

[0052] Furthermore, even after reducing the vehicle's speed to a suitable setting, if the distance to the vehicle in front is still relatively close, and even if the vehicle behind is relatively far away, continuing to reduce speed will still increase the risk of a rear-end collision. Therefore, it is necessary to remind the driver to change lanes so that the driver can make the appropriate lane change operation to avoid rear-ending the vehicle in front or any potential rear-end collisions with the vehicle behind.

[0053] Furthermore, the controller is also used for:

[0054] If it is determined that the distance between the vehicle and the vehicle behind remains at a safe distance during the deceleration process, the vehicle will decelerate according to the current lane until the speed is reduced to the set value.

[0055] Furthermore, the controller is also used when performing deceleration according to the current lane:

[0056] Once it is determined that the vehicle speed has reached the set value and the distance to the vehicle in front meets the safe distance requirement, the speed reduction command to the vehicle speed control device is stopped.

[0057] Furthermore, the controller is also used for:

[0058] Determine if the vehicle has changed lanes; if so, stop sending deceleration commands to the vehicle speed control device.

[0059] After the lane change operation is completed and the vehicle enters another lane, the system will make appropriate judgments based on the new road conditions. Once the new road conditions are suitable, the deceleration operation will cease.

[0060] Furthermore, it also includes:

[0061] The information collection system is used to acquire information such as road speed limit signs, distances between vehicles and their speeds, and send this information to the controller.

[0062] The positioning system is used to obtain vehicle information and speed limit information on the current road and send them to the controller;

[0063] The controller is also used to determine the actual speed limit of the current road based on the received road speed limit sign information and speed limit information; and to obtain the actual distance of its own vehicle from the vehicle in front and the vehicle behind based on the distance and speed information between the vehicle in front and the vehicle behind, and the vehicle information of the current road.

[0064] Specifically, the information acquisition system includes a forward-facing camera (including its control unit) to identify vehicles ahead and collect speed limit sign information. Combined with road speed limit information from a high-precision map, the system processes the data and issues warnings when a vehicle is speeding or the distance to the vehicle in front is less than a safe following distance. If the driver does not slow down, the information is transmitted to the control unit to dynamically adjust the vehicle speed and following distance. A vehicle speed control device (such as ESP or other existing vehicle features) collects the vehicle speed and sends it to the forward-facing camera controller. The system also receives commands from the forward-facing camera to execute deceleration operations, dynamically adjusting the vehicle speed and following distance. High-precision maps and GPS are used to locate the vehicle, and current road vehicle information and speed limit information are obtained from a map cloud database. Instrument panels and audio systems receive and display road conditions from the forward-facing camera and radar. When a vehicle is speeding, an alarm is issued to the driver, and the system intelligently controls the vehicle speed.

[0065] Furthermore, the controller is used to take the smaller value among the road speed limit sign information and the speed limit information as the actual speed limit value of the current road, and to take the smaller value among the distance information between the vehicle in front and the vehicle behind and the vehicle information of the current road as the actual distance of its own vehicle to the vehicle in front and the vehicle behind.

[0066] Furthermore, the controller is also used to obtain the real-time speed of its own vehicle, determine whether the real-time speed of its own vehicle exceeds the actual speed limit of the current road, and if so, send a speed reduction command to the speed control device.

[0067] Furthermore, it also includes:

[0068] The instrument display system receives information from the controller, including the vehicle's real-time speed, the current road speed limit, the vehicle's actual distance from the vehicle in front, and the distance from the vehicle behind, and displays the received information.

[0069] Furthermore, the controller is also used to first send a reminder message to the alarm device when it determines that the real-time speed of its own vehicle exceeds the actual speed limit of the current road, or when it determines that its own vehicle is too close to the vehicle in front. Only after determining that the driver has not taken any speed reduction action within a set time will it send a speed reduction command to the vehicle speed control device.

[0070] An alarm device is used to receive alert signals and issue voice reminders.

[0071] The vehicle equipped with the vehicle speed limit and safe following distance control system can always maintain a safe following distance from the vehicle ahead and display the speed limit value of the current road to the driver, reminding the driver to control the vehicle speed. When the vehicle exceeds the speed limit, it will remind the driver. If the driver does not take any action, it will intelligently control the vehicle to perform a deceleration operation to help the driver avoid potential dangers (rear-end collisions and speeding violations) caused by speeding.

[0072] In this embodiment, the information interaction among the controller, high-precision map, GPS, and vehicle speed control device (such as ESP, etc.) is all transmitted through the gateway routing. Using the high-precision map, GPS, and high-precision sensors, the vehicle's positioning is achieved, and the road conditions and speed limit information of the current road are obtained from the map cloud library and sent to the controller; using the vehicle speed control device on the vehicle, the vehicle speed information is collected and sent to the controller. When the vehicle exceeds the speed limit, it receives the deceleration command from the controller to control the vehicle to decelerate, so as to maintain the required vehicle speed and safe following distance.

[0073] Using the front-view camera and radar as sensors and the controller, the image data in front of the vehicle, the vehicle speed and following distance of the vehicle ahead, etc. are collected. The camera can identify the speed limit value on the speed limit sign, the radar monitors the vehicle speed and following distance of the vehicle ahead, and combines the speed limit information and road conditions information of the high-precision map. After the speed limit information is fused and processed, the road conditions and speed limit information of the current vehicle's driving road can be obtained. The controller will send the speed limit value to the instrument, and display the speed limit value and safe following distance reminder on the instrument.

[0074] When the vehicle exceeds the speed limit, the instrument emits a light and sound signal to alarm and remind the driver. If the driver does not perform a deceleration operation, the controller issues a deceleration command to the vehicle speed control device (such as ESP, etc.). The vehicle speed control device controls the vehicle to decelerate according to the command sent by the controller, dynamically adjusts the vehicle speed and adjusts the safe following distance.

[0075] The vehicle itself monitors its own vehicle speed and pre-collision time in real time through sensors. When the vehicle speed of the own vehicle is less than the speed limit value and TTC1>t1 (that is, there is a sufficient safety distance from the vehicle ahead, TTC1 represents the actual distance from the vehicle ahead, and t1 represents the safety distance from the vehicle ahead) are both satisfied, the own vehicle stops decelerating.

[0076] When the controller receives both the overspeed and the following distance less than the safe distance at the same time, the controller first executes the overspeed signal. The controller issues a deceleration command to the vehicle speed control device. The vehicle speed control device controls the vehicle to decelerate according to the command sent by the controller. At this time, if TTC1<t1 (that is, there is a collision risk with the vehicle ahead), the vehicle speed control device stops controlling the vehicle and activates the forward collision warning system to remind the driver that there is a collision danger between the own vehicle and the vehicle ahead, and prompts the driver to operate manually through the instrument and sound to stop decelerating or change lanes to avoid the collision risk.

[0077] If during deceleration, TTC2 < t2 (there is a risk of collision with the vehicle behind, where TTC2 represents the actual distance from the vehicle behind and t2 represents the safe distance from the vehicle behind), the forward collision warning system is activated to remind the driver that there is a risk of collision between the vehicle itself and the vehicle behind, and prompt the driver to perform manual operations.

[0078] Embodiment 2

[0079] This embodiment discloses a method for controlling vehicle speed limit and safe following distance.

[0080] The method for controlling vehicle speed limit and safe following distance includes the following steps:

[0081] The controller obtains the vehicle speed, the distance from the vehicle in front, and the distance from the vehicle behind of its own vehicle, and determines whether the distance from the vehicle in front is too close. If so, a deceleration command is sent to the vehicle speed control device; at the same time, it is determined whether the distance from the vehicle behind is too close during deceleration or whether the distance from the vehicle in front is still too close during the process of reducing the vehicle speed to the set value. When at least one of the above two situations is satisfied, a reminder signal is sent to the warning device to remind the driver to stop decelerating and perform lane-changing operations;

[0082] The vehicle speed control device receives the deceleration command and performs deceleration operations.

[0083] Those skilled in the art should understand that the above-mentioned modules or steps of the present invention can be implemented by a general-purpose computer device. Optionally, they can be implemented by program codes executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be separately made into individual integrated circuit modules, or multiple modules or steps of them can be made into a single integrated circuit module to implement. The present invention is not limited to any specific combination of hardware and software.

[0084] Although the specific implementation manners of the present invention are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made without creative efforts by those skilled in the art are still within the protection scope of the present invention.

Claims

1. A vehicle speed limiting and safe following distance control system, characterized in that, include: The controller is used to obtain the vehicle's speed, distance to the vehicle in front, and distance to the vehicle behind. It determines whether the distance between the vehicle and the vehicle in front is too close. If so, it sends a deceleration command to the vehicle speed control device. At the same time, it determines whether the distance to the vehicle behind is too close during the deceleration process, or whether the distance to the vehicle in front is still too close during the process of reducing the speed to the set value. When at least one of the above two situations is met, a reminder signal is issued to remind the driver to stop decelerating and change lanes. The vehicle speed control device is used to receive speed reduction commands and perform speed reduction operations; Even if the vehicle behind is far away, continuing to slow down will still increase the risk of a rear-end collision if the vehicle is still close to the car in front after reducing its speed to a suitable set value. In this case, it is necessary to remind the driver to change lanes so that the driver can make the appropriate lane change operation. The information collection system is used to acquire information such as road speed limit signs, distances between vehicles and their speeds, and send this information to the controller. The positioning system is used to obtain vehicle information and speed limit information on the current road and send them to the controller; The controller is also used to determine the actual speed limit value of the current road based on the received road speed limit sign information and speed limit information; and to obtain the actual distance of its own vehicle from the vehicle in front and the vehicle behind based on the distance and speed information between the vehicle in front and the vehicle behind, and the vehicle information of the current road. The instrument display system is used to receive the vehicle's real-time speed, the actual speed limit of the current road, the actual distance between the vehicle and the vehicle in front, and the distance between the vehicle and the vehicle behind from the controller, and then display the received information. Speed ​​overspeed control is embedded into the safe following distance control logic. When both speeding and following too closely occur simultaneously, speeding control is prioritized and the speeding control logic is executed.

2. The vehicle speed limiting and safe following distance control system as described in claim 1, characterized in that, The controller is also used for: If it is determined that the distance between the vehicle and the vehicle behind remains at a safe distance during the deceleration process, the vehicle will decelerate according to the current lane until the speed is reduced to the set value.

3. The vehicle speed limiting and safe following distance control system as described in claim 2, characterized in that, The controller is also used when performing deceleration according to the current lane: Once it is determined that the vehicle speed has reached the set value and the distance to the vehicle in front meets the safe distance requirement, the speed reduction command to the vehicle speed control device is stopped.

4. The vehicle speed limiting and safe following distance control system as described in claim 1, characterized in that, The controller is also used for: Determine if the vehicle has changed lanes; if so, stop sending deceleration commands to the vehicle speed control device.

5. The vehicle speed limiting and safe following distance control system as described in claim 1, characterized in that, The controller is used to take the smaller value between the road speed limit sign information and the speed limit information as the actual speed limit value of the current road, and to take the smaller value between the distance information between the vehicle in front and the vehicle behind and the vehicle information of the current road as the actual distance of its own vehicle to the vehicle in front and the vehicle behind.

6. The vehicle speed limiting and safe following distance control system as described in claim 1, characterized in that, The controller is also used to obtain the real-time speed of its own vehicle, determine whether the real-time speed of its own vehicle exceeds the actual speed limit of the current road, and if so, send a speed reduction command to the speed control device.

7. The vehicle speed limiting and safe following distance control system as described in claim 6, characterized in that: The controller is also used to send a reminder message to the alarm device when it determines that the real-time speed of its own vehicle exceeds the actual speed limit of the current road or that the distance between its own vehicle and the vehicle in front is too close. Only after determining that the driver has not taken any speed reduction action within a set time will it send a speed reduction command to the vehicle speed control device. An alarm device is used to receive alert signals and issue voice reminders.

8. A method for controlling vehicle speed limits and safe following distances, characterized in that: Includes the following steps: The controller acquires the vehicle's speed, distance to the vehicle in front, and distance to the vehicle behind. It determines whether the distance between the vehicle in front and the vehicle in front is too close. If so, it sends a deceleration command to the vehicle speed control device. At the same time, it determines whether the distance to the vehicle behind is too close during the deceleration process, or whether the distance to the vehicle in front is still too close during the process of reducing the speed to the set value. When at least one of the above two situations is met, it sends a reminder signal to the alarm device to remind the driver to stop decelerating and change lanes. The vehicle speed control device receives a speed reduction command and performs a speed reduction operation; Even if the vehicle behind is far away, continuing to slow down will still increase the risk of a rear-end collision if the vehicle is still close to the car in front after reducing its speed to a suitable set value. In this case, it is necessary to remind the driver to change lanes so that the driver can make the appropriate lane change operation. The information collection system is used to acquire information such as road speed limit signs, distances between vehicles and their speeds, and send this information to the controller. The positioning system is used to obtain vehicle information and speed limit information on the current road and send them to the controller; The controller is also used to determine the actual speed limit value of the current road based on the received road speed limit sign information and speed limit information; and to obtain the actual distance of its own vehicle from the vehicle in front and the vehicle behind based on the distance and speed information between the vehicle in front and the vehicle behind, and the vehicle information of the current road. The instrument display system is used to receive the vehicle's real-time speed, the actual speed limit of the current road, the actual distance between the vehicle and the vehicle in front, and the distance between the vehicle and the vehicle behind from the controller, and then display the received information. Speed ​​overspeed control is embedded into the safe following distance control logic. When speeding and excessively close following occur simultaneously, speeding control is prioritized and the speeding control logic is executed.

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