KR20160072485A - Adaptive cruise control system of vehicle and method thereof - Google Patents

Abstract

The present invention provides an adaptive cruise control system of a vehicle. According to the present invention, provided is the adaptive cruise control system of a vehicle, which comprises: a distance detection unit detecting a distance between a front barrier and a vehicle; a user interface receiving the target speed and target acceleration of a vehicle; and a control unit setting acceleration based on the detected distance between the front barrier and the vehicle and the target speed. Moreover, the control unit accelerates the vehicle to the target speed based on the inputted target acceleration value.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an adaptive cruise control system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Adaptive Cruise Control (ACC) of a vehicle, and relates to an adaptive cruise control system capable of adjusting a set acceleration value by a user's intention.

In general, the Adaptive Cruise Control System (ACC) provides the driver with convenience by keeping the speed of the vehicle in accordance with the external road conditions without having to step on the brake or accelerator pedal when the driver sets the vehicle speed at a constant speed.

In addition, recently, an adaptive cruise control system capable of decelerating or accelerating while maintaining a distance from a vehicle ahead by providing a radar in a vehicle has been developed.

Meanwhile, the cruise control system of this vehicle uses information of the distance between the control vehicle and the preceding vehicle, the relative speed, and the angle of the control vehicle with respect to the traveling direction of the vehicle using the front radar sensor of the vehicle, And a predetermined acceleration limit value to control the acceleration control device, the engine control device, and the braking control device of the control vehicle.

However, the conventional cruise control system has a problem in that cruise control is performed using a preset longitudinal speed and a preset acceleration limit value, and thus the driver's propensity to drive various drivers can not be reflected.

That is, when the driver wishes to accelerate or decelerate quickly, or when it is desired to accelerate and decelerate relatively smoothly, the conventional adaptive cruise control system fails to satisfy the driver's degree of acceleration / deceleration.

Embodiments of the present invention seek to implement an adaptive cruise control system that reflects the driving behavior of a driver by allowing the driver to directly set a desired acceleration feeling when the adaptive cruise control is executed.

According to an aspect of the present invention, there is provided a vehicular navigation system including: a distance sensing unit for sensing a distance to a front obstacle of a vehicle; a user interface for receiving a target speed and a target acceleration input of the vehicle; And a controller configured to set an acceleration based on a distance between the detected obstacle and the target obstacle and based on the target speed, wherein the control unit controls the adaptive cruise control of the vehicle accelerating to the target speed based on the input target acceleration value System can be provided.

The control unit may compare a maximum acceleration value corresponding to the sensed vehicle speed with a target acceleration value input by the user.

In addition, the controller may accelerate the target acceleration to the maximum acceleration value when the target acceleration value input by the user exceeds the maximum acceleration value.

In addition, the maximum acceleration value may decrease as the speed of the vehicle increases.

In addition, the user interface may display the target acceleration value so that the user can input the target acceleration value below the maximum acceleration.

Also, the control unit may accelerate the vehicle to the target speed with a preset acceleration value before receiving the target acceleration input of the vehicle driver.

 According to another aspect of the present invention, there is provided a control method for a vehicle, including: sensing a distance to a front obstacle of a vehicle; receiving a target speed or target acceleration input of the driver; Setting an acceleration; And a control method of the adaptive cruise control system of the vehicle accelerating to the set target speed based on the target acceleration value inputted by the driver.

The step of accelerating to the set target speed may further include comparing a maximum acceleration value corresponding to the sensed vehicle speed with a target acceleration value input by the user, . ≪ / RTI >

The step of accelerating to the set target speed may further include accelerating the target acceleration to the maximum acceleration value when the target acceleration inputted by the user exceeds the maximum acceleration value.

In addition, the maximum acceleration value can be controlled to decrease as the speed of the vehicle increases.

The method may further include displaying the target acceleration so that the user can input the target acceleration below the maximum acceleration.

In addition, it can be controlled so as to accelerate to the target speed with a preset acceleration value before receiving the target driver's acceleration input.

According to the present invention, the driver can set the upper limit acceleration at the time of executing the adaptive cruise control, so that the driver who desires the quick acceleration can feel less frustration.

That is, compared with the conventional adaptive cruise control system, satisfaction can be felt in terms of driving feeling.

1 is a block diagram of an adaptive cruise control system of a vehicle according to the present invention
2 is a graph illustrating a maximum acceleration value according to a vehicle speed of an adaptive cruise control system of a vehicle according to an embodiment of the present invention.
3 is a flowchart of an adaptive cruise control system of a vehicle according to an embodiment of the present invention.
4 is a screen of a display unit of an adaptive cruise control system of a vehicle according to an embodiment of the present invention.
5 is a flowchart of an adaptive cruise control system of a vehicle according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs.

However, the present invention is not limited to the embodiments shown herein but may be embodied in other forms. For the sake of clarity, the drawings are not drawn to scale, and the size of the elements may be slightly exaggerated to facilitate understanding.

1 is a block diagram of an adaptive cruise control system 1 of a vehicle according to the present invention.

Referring to FIG. 1, an adaptive cruise control system 1 of a vehicle includes a user interface 10, a distance sensing unit 20, a speed sensing unit 30, and a control unit 40.

The user interface 10 may include a touch screen 11 as an example of receiving a control command from a driver and displaying various image information according to a control command of the driver. However, the present invention is not limited to this, and it is possible to receive the control command of the driver by using the switch, or receive the control command of the driver by using the jog dial.

Specifically, the touch screen 11 receives the control command of the driver and can visually display various information in response to the control command input by the driver.

The touch screen 11 includes a touch panel (not shown) for detecting whether the driver touches the touch panel, a display (not shown) for displaying information corresponding to the touch input, and a touch screen controller ).

The distance sensing unit 20 senses a front vehicle existing in front of the vehicle. In addition, the distance sensor 20 may employ a laser sensor (not shown) to detect the distance to the obstacle.

An infrared laser sensor commonly used as such a laser sensor can emit infrared rays toward the front vehicle and receive infrared rays reflected by the front vehicle. However, the present invention is not limited to this, and a laser sensor using an electromagnetic wave may be employed.

Also, the infrared laser provides an electrical signal corresponding to the reflected infrared rays to the distance sensing unit 20, and the distance sensing unit 20 measures the intensity of the reflected infrared rays or the time difference between the transmitted infrared rays and the reflected infrared rays The distance between the other vehicle and the vehicle can be calculated.

The speed sensing unit 30 senses the speed of the vehicle. The speed sensing unit 30 may employ a wheel speed sensor 31 to sense the speed of the vehicle.

The wheel speed sensor 31 may be installed inside the wheel of the vehicle to detect the rotational speed of the vehicle wheel and send a detection signal to the control unit 40. The speed of the vehicle and the acceleration of the vehicle can be measured through the detection signal detected by the wheel speed sensor 31. [

The control unit 40 collectively controls the adaptive cruise control system 1 of the vehicle.

Specifically, the control unit 40 includes a main processor 41 for controlling the speed and acceleration of the vehicle, mediating data input / output between the various components included in the adaptive cruise control system 1 of the vehicle and the control unit 40, And a memory 42 for storing programs and data.

Also, the acceleration of the vehicle under running can be set using the speed of the vehicle sensed by the speed sensing unit 30, the inter-vehicle distance, and the target speed inputted by the driver.

If the current distance between the vehicle and the preceding vehicle is greater than or equal to a certain distance, the acceleration to reach the target speed can be set. Specifically, the acceleration value until the target speed is reached can be controlled to limit the maximum acceleration value that can be accelerated according to the current vehicle speed.

Also, the main processor 41 may control the touch screen 11 to display a screen so that the user can input the target acceleration value. Specifically, since the user can adjust the target acceleration value until the target speed is reached, the user is controlled to travel at a desired target acceleration rather than the acceleration set by the control unit 40, thereby allowing the driver to feel a desired acceleration There is an effect that can be.

The user can adjust the target acceleration value until the target speed is reached but the adjustable acceleration value can not exceed the maximum acceleration value set in the main processor 41. [

The memory 42 stores a control program and control data for controlling the operation of the adaptive cruise control system 1, a vehicle speed sensed by the speed sensing unit 30, an inter-vehicle distance calculated from the distance sensing unit 20, Various kinds of control signals and the like outputted from the control unit 41 can be temporarily stored.

The memory 42 may be a volatile memory such as a S-RAM or a D-RAM, as well as a flash memory, a read only memory, an erasable programmable read only memory (EPROM) (Electrically Erasable Programmable Read Only Memory (EEPROM)).

Specifically, the non-volatile memory may semi-permanently store control programs and control data for controlling the operation of the vehicle's adaptive cruise control system 1, and the volatile memory may call control programs and control data from the non-volatile memory The vehicle speed sensed by the speed sensing unit 30, the inter-vehicle distance calculated by the distance sensing unit 20, and various control signals output by the main processor 41, for example.

 2 is a graph showing the maximum acceleration value according to the vehicle speed of the adaptive cruise control system 1 of the vehicle according to the embodiment of the present invention.

The maximum acceleration value of the adaptive cruise control system 1 may be preset according to the vehicle speed sensed by the speed sensing unit 30 of the present invention.

Also, according to the present invention, the maximum acceleration value in the main processor 41 in the control unit 40 may be set to decrease as the vehicle speed increases.

2, when the vehicle speed is lower than the first vehicle speed 21, the maximum acceleration of the adaptive cruise control system 1 until reaching the target speed calculated by the control unit 40 May have a first maximum acceleration (23) value.

When the vehicle speed exceeds the first vehicle speed 21, the adaptive cruise control system 1 sets the maximum acceleration of the adaptive cruise control system 1 until the target speed is reached to the first maximum acceleration 23, And a second maximum acceleration (24) smaller than the second maximum acceleration (24).

When the vehicle speed exceeds the second vehicle speed 22, the adaptive cruise control system 1 sets the maximum acceleration of the adaptive cruise control system 1 until the target speed is reached to the second maximum acceleration 24, The third maximum acceleration 25 can be controlled to be smaller.

In addition, the user can set the acceleration value within a range limited by the maximum acceleration value. More specifically, for example, if the vehicle speed is running below the first vehicle speed 21, the user can select the acceleration below the first maximum acceleration 23 using the touch screen 11, The acceleration value can be selected.

However, the setting of the maximum acceleration is not limited to the maximum acceleration value for the speed according to the present graph, and can be set variously, such as a linear graph or an inverse graph.

FIG. 3 is a flow chart of the adaptive cruise control system 1 according to the present invention, and FIG. 4 is a schematic diagram showing a screen of the touch screen 11 of the adaptive cruise control system 1 according to the present invention.

As shown in Fig. 3, the user starts by entering the set acceleration into the adaptive cruise control system 1 (100).

That is, the user can input the set acceleration to the touch screen 11.

Specifically, as shown in FIG. 4, the vehicle speed sensed by the speed sensing unit 30 can be displayed on the touch screen 11 at a current speed. In addition, the maximum acceleration value corresponding to the vehicle speed sensed by the speed sensing unit 30 can be displayed.

At this time, the user can select the set acceleration value within a range not exceeding the maximum acceleration value.

At this time, although not shown, the user may directly input a target acceleration value desired by the user, or may change the target acceleration value by clicking the left and right arrows of the set acceleration.

When the user inputs the target acceleration, the adaptive cruise control system 1 determines whether the target acceleration of the vehicle exceeds the maximum acceleration (200). Specifically, in the adaptive cruise control system 1, the maximum acceleration value is set according to the vehicle speed sensed by the speed sensing unit 30. [ Therefore, the maximum acceleration value corresponding to the sensed vehicle speed is compared with the set acceleration value inputted by the user.

Thereafter, when the set acceleration input by the user exceeds the maximum acceleration (YES in step 200), the controller 40 controls the adaptive cruise control system 1 at the maximum acceleration to reach the target speed 300 .

If the set acceleration input by the user does not exceed the maximum acceleration (NO in 200), the control unit 40 can control the adaptive cruise control system 1 to reach the target speed (400) at the target acceleration.

5 is a flowchart of an adaptive cruise control system of a vehicle according to another embodiment of the present invention.

According to the present invention, the adaptive cruise control system 1 performs smart cruise control (101). Specifically, the control unit 40 sets the acceleration of the vehicle based on the vehicle speed and the distance from the forward vehicle acquired by the speed sensing unit 30 and the distance sensing unit 20, and the target speed of the vehicle set by the user, The vehicle can be driven at an acceleration value.

However, the user can change the set acceleration to the target acceleration using the user interface 10 (201). Specifically, the control unit 40 may output a control signal to the touch screen 11 to display a display unit capable of changing the setting acceleration, as shown in FIG.

When the user inputs the target acceleration to be changed, the adaptive cruise control system 1 determines whether the target acceleration of the vehicle exceeds the maximum acceleration corresponding to the current traveling vehicle speed (301). Specifically, in the adaptive cruise control system 1, the maximum acceleration value is set according to the vehicle speed sensed by the speed sensing unit 30. [ Therefore, the maximum acceleration value corresponding to the sensed vehicle speed is compared with the changed setting acceleration value inputted by the user.

Thereafter, when the changed target acceleration inputted by the user exceeds the maximum acceleration (the example of 301), the control unit 40 controls the adaptive cruise control system 1 at the maximum acceleration (401) to reach the target speed have.

If the target acceleration inputted by the user does not exceed the maximum acceleration (NO in 200), the control unit 40 controls the adaptive cruise control system 1 with the target acceleration to be changed (501) to reach the target speed can do.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein; It will be understood that various modifications may be made without departing from the spirit and scope of the invention.

1: adaptive cruise control system

Claims (12)

A distance sensing unit for sensing a distance to a front obstacle of the vehicle;
A user interface receiving a target speed and a target acceleration input of the vehicle; And
And a controller for setting an acceleration based on the detected distance to the front obstacle and the target speed,
Wherein the control unit accelerates the vehicle to the target speed based on the input target acceleration value. The method according to claim 1,
And a speed sensing unit for sensing a speed of the vehicle,
Wherein the controller compares a maximum acceleration value corresponding to the sensed vehicle speed with a target acceleration value input by the user. 3. The apparatus of claim 2, wherein the control unit
And accelerates from the maximum acceleration value to the target speed when the target acceleration value input by the user exceeds the maximum acceleration value. The method of claim 3,
Wherein the maximum acceleration value decreases as the speed of the vehicle increases. 5. The method of claim 4,
Wherein the user interface indicates that the user is able to input the target acceleration value below the maximum acceleration. 6. The method according to any one of claims 1 to 5,
Wherein the control unit accelerates to the target speed with a preset acceleration value before receiving the target acceleration input of the vehicle driver. Sensing a distance to a front obstacle of the vehicle;
Receiving a driver's target speed or target acceleration input;
Setting an acceleration based on the detected distance to the front obstacle and the target speed; And
And accelerates the vehicle to the set target speed based on the target acceleration value input by the driver. 8. The method of claim 7,
Further comprising: sensing a speed of the vehicle;
Wherein the accelerating to the set target speed includes comparing a maximum acceleration value corresponding to the sensed vehicle speed with a target acceleration value input by the user. 9. The method of claim 8,
Wherein the step of accelerating to the set target speed includes the step of accelerating to the target speed with the maximum acceleration value when the target acceleration inputted by the user exceeds the maximum acceleration value Way. 10. The method of claim 9,
Wherein the maximum acceleration value is decreased as the speed of the vehicle increases. 11. The method of claim 10,
Further comprising the step of: displaying the target acceleration so that the user can input the target acceleration below the maximum acceleration. 12. The method according to any one of claims 7 to 11,
And controls the vehicle to accelerate to the target speed with a predetermined acceleration value before receiving the target acceleration input of the vehicle driver.

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