KR20120000818A - Headway distance/minimum distance setting system and method thereof - Google Patents

Abstract

PURPOSE: A headway distance/minimum distance setting system is provided to changeably set headway distance when controlling headway distance according the characteristic of a driver and surrounding condition. CONSTITUTION: A headway distance/minimum distance setting system comprises a raider system, a vehicle speed sensor, an ACC controlling unit, and a memory. The raider system detects a front vehicle by injecting laser beam to the front of a driving vehicle. The raider system detects the distance with the front car. The speed sensor detects the current speed of the driving vehicle. The ACC controlling unit studies the driving pattern of the front car by the distance with the front car in real time. The ACC controlling unit sets headway distance and minimum distance by using the detected distance with the front car. The memory stores the set headway distance and minimum distance.

Description

Vehicle maintenance distance / minimum distance setting system and its setting method {Headway Distance / Minimum Distance Setting System and Method}

The present invention relates to an inter-vehicle holding distance / minimum distance setting system for setting the inter-vehicle holding distance and minimum distance between the host vehicle and the preceding vehicle, and a setting method thereof.

The Adaptive Cruise Control (ACC) system, which is a distance control system, aims to reduce the burden on the driver while driving and smooth the traffic flow on the road by partially automating the acceleration / deceleration control for the longitudinal direction in which the vehicle is driving. .

In the case of a vehicle equipped with such an ACC system, when there is no vehicle ahead, the driver sets a target speed set by the driver, and when there is a vehicle ahead, the vehicle is controlled to maintain a proper distance between the vehicle ahead.

In general, a method for controlling the distance between vehicles of the ACC system includes a preceding vehicle, and when the host vehicle is running, the vehicle speed is detected to calculate a headway distance between the host vehicle and the front vehicle. The ACC system calculates the distance between vehicles by the following equation.

Headway distance = Headway time x vehicle speed... … … … … … … … … Formula (1)

When the distance between vehicles is calculated, the distance between the own vehicle and the preceding vehicle is measured using the radar system, and the distance between the vehicle and the distance between the vehicles is judged. The traveling vehicle speed of the own vehicle is accelerated and the distance between the vehicles is narrowed.

On the contrary, when the inter-vehicle distance is smaller than the safety distance, by controlling the brake, the running vehicle speed of the own vehicle is decelerated to increase the inter-vehicle distance.

As described above, the ACC system automatically controls the speed by switching between the distance control mode and the speed control mode according to the presence of the preceding vehicle.

When there is a preceding vehicle, when the driver switches to the distance control mode, the driver selects one of several preset headway times with a time between 1 and 2 seconds through the headway button provided on the driver input device. Accordingly, the vehicle maintenance distance is changed. However, even if the driver has various and desired distances to maintain the vehicle, such as the elderly, the young, the female, and the like, there is a problem that the headway time is uniformly set without considering this.

In addition, the headway time, which is limited in some ways, is not considered in the non-linear part depending on the speed. In addition, even if the non-linear part is taken into consideration, it is difficult to satisfy the driving tendency of all drivers because it is difficult to consider the non-linearity of all drivers.

In addition, when the vehicle is finally stopped, the minimum distance, which is the distance to the preceding vehicle, also varies according to the driver. However, since the current ACC system is set to a constant distance (for example, 2m), the driver's disposition is satisfied. There is a problem that is difficult to make.

The present invention is to solve such a problem, an object of the present invention is to learn the preceding vehicle tracking pattern of the driver in real time when there is a preceding vehicle in real time by controlling the distance between the vehicle according to the driver's disposition and surrounding environment The present invention provides an inter-vehicle holding distance / minimum distance setting system and a method for setting the holding distance.

According to an aspect of the present invention, an inter-vehicle holding distance / minimum distance setting system includes: a radar system that detects a preceding vehicle by scanning a laser beam in front of a driving vehicle and detects a distance between the preceding vehicles; A vehicle speed sensor detecting a current vehicle speed of a vehicle that is driving; And an ACC control unit that learns a driver's preceding vehicle tracking pattern in real time using the distance between vehicles detected through the radar system, and sets the distance between the vehicle and the minimum distance using the detected vehicle distance.

The apparatus may further include a memory configured to store the inter-vehicle holding distance and the minimum distance set by the ACC control unit.

In addition, the ACC control unit receives the detected distance from the radar system by the set number of times, calculates the average value of the inputted distance between the set number of times, and sets the average value of the calculated inter-vehicle distances as the between-vehicle holding distance and the minimum distance.

According to another aspect of the present invention, a method for setting an inter-vehicle holding distance includes determining whether a driving state of a vehicle has entered a setting mode when a preceding vehicle is present while the vehicle is running; If the driving state of the vehicle enters the setting mode, detecting the speed of the vehicle and the inter-vehicle distance to the preceding vehicle at predetermined time intervals; Determining whether the number of distance detections between the vehicles has reached the set number of times; Calculating the average value of the distances detected by the number of times when the number of times of the distance detection reaches the set number of times; The average value of the calculated inter-vehicle distance is set as the inter-vehicle holding distance.

The setting mode is a case where the distance between the vehicle and the preceding vehicle maintains a constant distance, or the vehicle follows the preceding vehicle running at a constant speed.

According to another aspect of the present invention, there is provided a minimum distance setting method, comprising: determining whether driving of a vehicle is finally stopped when there is a preceding vehicle while driving of the vehicle; If the driving of the vehicle is finally stopped, detecting the inter-vehicle distance from the time when the driving of the vehicle stops to the preceding vehicle; Determining whether the accumulated inter-vehicle distance detection number has reached the set number of times; Calculating the average value of the detected inter-vehicle distances when the accumulated inter-vehicle distance detection number reaches the set number of times; The average value of the calculated inter-vehicle distances is set as the minimum distance.

As described in detail above, according to an aspect of the present invention, an inter-vehicle holding distance, which is an important control value in controlling the inter-vehicle distance, may be variably set according to the driver's disposition and the surrounding environment.

1 is a control block diagram of an inter-vehicle holding distance setting system according to an embodiment of the present invention.
2 is a flowchart illustrating a method for setting a space keeping distance according to an embodiment of the present invention.
3 is a flowchart illustrating a minimum distance setting method according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a control block diagram of an inter-vehicle holding distance setting system according to an embodiment of the present invention. The vehicle maintenance distance setting system according to an embodiment of the present invention includes a driver input device 10, a radar system 20, a vehicle speed sensor 30, an ACC control unit 40, and a memory 50.

The driver input device 10 is mounted near the driver's seat module of the vehicle and includes a main button 11, a plus button 12, and a minus button 13.

The main button 11 is an operation member for operating the ACC system. When the main button 11 is turned on, power is applied to the ACC system to be in an operating state.

The plus button 12 is an operation member for increasing the distance between the vehicle and the vehicle speed in the non-vehicle holding distance setting mode, that is, in the inter-vehicle distance control mode and the speed control mode.

The minus button 13 is an operation member for reducing the distance between the vehicle and the vehicle speed when the vehicle is not in the vehicle maintenance distance setting mode, that is, in the vehicle distance control mode and the speed control mode.

The radar system 20 for detecting a relative distance to the preceding vehicle detects the preceding vehicle by scanning a laser beam in front of the vehicle, and at the same time detects the inter-vehicle distance to the preceding vehicle.

The vehicle speed sensor 30 detects a current vehicle speed of a driving vehicle.

The ACC control unit 40 includes a vehicle speed control unit 41, an inter-vehicle distance control unit 42, and an inter-vehicle holding distance / minimum distance learning unit 43.

The vehicle speed control unit 41 controls acceleration / deceleration of the running vehicle speed of the host vehicle according to the comparison result between the inter-vehicle distance and the inter-vehicle holding distance detected by the radar system 20.

The inter-vehicle distance control section 42 controls to follow the inter-vehicle holding distance in which the inter-vehicle distance between the own vehicle and the preceding vehicle is set when there is a preceding vehicle while the own vehicle is running.

The inter-vehicle holding distance / minimum distance learning unit 43 is equipped with a logic function for learning the inter-vehicle holding distance / minimum distance, and learns the driver's preceding vehicle tracking pattern in real time, thereby maintaining the inter-vehicle holding distance and Set / store the minimum distance.

The memory 50 stores the distance between the vehicle and the minimum distance set by the vehicle distance / learn distance learning.

2 is a flowchart illustrating a method for setting a space keeping distance according to an embodiment of the present invention.

After a predetermined time elapses after the driver starts driving (110), the ACC control unit 40 determines whether the driving state of the vehicle has entered the setting mode (120). Here, the setting mode refers to a case where the distance between the host vehicle and the preceding vehicle maintains a constant distance when the preceding vehicle is running while the own vehicle is running or follows the preceding vehicle running at a constant speed.

As a result of determination, when the driving state of the vehicle enters the setting mode (YES in step 120), the ACC control unit 40 detects the own vehicle speed detected by the vehicle speed sensor 30 and the radar system 20 at regular intervals. And receiving the distance between the vehicle (130).

Thereafter, the ACC control unit 40 determines whether the number of times of detecting the distance between vehicles detected by the radar system 20 has reached the set number (n times) (140). If the determination result does not reach the set number of times (n times) (NO in step 140), the process returns to step 130 and continues until the number of detected distance distances reaches the set number (n times). Detects vehicle speed and distance between cars.

On the other hand, if the number of detected distances has reached the set number (n times) as a result of the determination (YES in step 140), the distance between the most recent n items is stored in the memory 50, and the distance between the most recent n items is stored. The average value of is calculated (150).

Thereafter, the average value of the calculated inter-vehicle distance is set as the inter-vehicle holding distance and stored in the memory 50 (160). The ACC control unit 40 controls the inter-vehicle distance between the host vehicle and the preceding vehicle based on the inter-vehicle holding distance stored in the memory 50.

As described above, according to the present exemplary embodiment, when the preceding vehicle tracking pattern of the driver is learned in real time and the distance between the driver and the surrounding environment is set according to the driver's propensity and the surrounding environment, it is generated when the distance between the vehicle is calculated using the headway time. It is possible to solve the problem that the vehicle maintenance distance does not consider the non-linear part according to the speed.

3 is a flowchart illustrating a minimum distance setting method according to an embodiment of the present invention.

After a predetermined time elapses after the driver starts to drive the vehicle (210), the ACC control unit 40 determines whether the driving of the vehicle is finally stopped (220).

As a result of determination, when the driving of the vehicle is finally stopped (YES in step 220), the ACC control unit 40 receives the distance between the vehicles detected through the radar system 20 at the time when the driving of the vehicle is stopped, and stores the memory. Stored in 50 (230). The memory 50 stores cumulative distances between the host vehicle and the preceding vehicle for each time point at which the vehicle is finally stopped.

Thereafter, the ACC control unit 40 determines whether the cumulative inter-vehicle distance detection count detected by the radar system 20 has reached a set number (n times) (240). If it is determined that the accumulated number of detected inter-vehicle distances does not reach the set number (n times) (NO in step 240), it is impossible to set the minimum distance sufficiently reflecting the driver's tendency due to the lack of the accumulated number of detected inter-vehicle distances. It determines that it is, and maintains the predetermined minimum distance.

On the other hand, if the cumulative inter-vehicle distance detection count reaches the set number (n times) (YES in step 240), the average value of the inter-vehicle distances for the latest n pieces is calculated (250).

Thereafter, the average value of the calculated inter-vehicle distance is set as the minimum distance and stored in the memory 50 (260). The ACC control unit 40 controls the distance between the host vehicle and the preceding vehicle when the driving of the vehicle is finally stopped based on the minimum distance stored in the memory 50.

As described above, in the present embodiment, when the driving of the vehicle is finally stopped, the minimum distance, which is a distance from the preceding vehicle, is learned and the minimum distance is set according to the driver's propensity and the surrounding environment, thereby satisfying various driver's propensities. do.

10: driver input device 20: radar system
30: vehicle speed sensor 40: ACC control unit
50: memory

Claims (6)

A radar system that detects a preceding vehicle by scanning a laser beam in front of a driving vehicle and detects an inter-vehicle distance to the preceding vehicle;
A vehicle speed sensor detecting a current vehicle speed of the vehicle that is driving; And
Inter-vehicle holding distance / minimum including an ACC control unit that learns the preceding vehicle tracking pattern of the driver in real time with the inter-vehicle distance detected through the radar system and sets the inter-vehicle holding distance and minimum distance using the detected inter-vehicle distance. Distance setting system. The method of claim 1,
And a memory for storing the inter-vehicle holding distance and the minimum distance set by the ACC control unit. The method of claim 1,
The ACC control unit receives a distance detected from the radar system by a set number of times, calculates an average value of the distance between the inputs received by the set number of times, and sets the average value of the calculated distance between the vehicle to a distance and a minimum distance. Inter-vehicle keeping distance / min distance setting system. Determining whether the driving state of the vehicle has entered a setting mode when there is a preceding vehicle while the vehicle is running;
Detecting a speed of the vehicle and an inter-vehicle distance to the preceding vehicle at predetermined time intervals when the driving state of the vehicle enters a setting mode;
Determining whether the number of detected distances between the vehicles has reached a set number of times;
Calculating the average value of the distances detected by the set number of times when the number of detected distances reaches the set number of times;
A method for setting a distance between vehicles, wherein the average value of the calculated distance between vehicles is set as a distance between vehicles. The method of claim 4, wherein the setting mode is a case where the distance between the vehicle and the preceding vehicle maintains a constant distance or the vehicle follows the preceding vehicle that runs at a constant speed. Determining whether driving of the vehicle is finally stopped when there is a preceding vehicle while driving of the vehicle;
If the driving of the vehicle is finally stopped, detecting the inter-vehicle distance to the preceding vehicle when the driving of the vehicle is stopped;
Determining whether the accumulated inter-vehicle distance detection number has reached the set number of times;
Calculating an average value of the detected inter-vehicle distances when the accumulated inter-vehicle distance detection number reaches a set number of times;
The minimum distance setting method of setting the average value of the calculated inter-vehicle distance as the minimum distance.

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