KR20150121983A - Adaptive cruise control system of vehicle and method thereof - Google Patents

Abstract

The present invention relates to an adaptive cruise control (ACC) system and a method thereof, temporarily releasing an operation performed in an ACC mode when a driver steps on a brake pedal, and when there is no front vehicle or in a non-dangerous situation where the operation can be performed in spite of a front vehicle, re-operating the temporarily released ACC mode. According to an embodiment of the present invention, the adaptive cruise control system comprises: a reception unit receiving a brake input signal in accordance with pressure applied to the brake pedal while performing the operation in the adaptive cruise control mode; a temporary release unit temporarily releasing the operation in the adaptive cruise control mode when the brake input signal is received; and a determination unit for determining whether the temporarily released adaptive cruise control mode is re-operated or released in accordance with a satisfactory result of the first condition to determine whether the front vehicle positioned on the front side of the subject vehicle exists when a brake restoration signal is received depending on releasing of the brake pedal after the operation of the adaptive cruise control mode is temporarily released by the temporary releasing unit and a satisfactory result of the second condition to determine whether the subject vehicle is in a dangerous situation.

Description

ADAPTIVE CRUISE CONTROL SYSTEM OF VEHICLE & METHOD THEREOF < RTI ID = 0.0 >

The present invention relates to an adaptive cruise control system and method. More particularly, the present invention relates to an adaptive cruise control system and method for an adaptive cruise control system and method. More particularly, The present invention relates to an adaptive cruise control system and method capable of restarting a temporarily released ACC mode.

The vehicle is equipped with an adaptive cruise control system for the convenience of the driver.

The adaptive cruise control system has been filed in many cases, such as Korean Patent Publication No. 2006-53652 and Korean Patent Publication No. 2008-32003.

The conventional adaptive cruise control system including the patent is a system that travels in accordance with the distance and speed with respect to the preceding vehicle when there is a preceding vehicle and runs at a speed set by the driver when there is no preceding vehicle.

When the driver depresses the brake pedal during the adaptive cruise control (hereinafter referred to as 'ACC') operation of the adaptive cruise control system, the ACC is released.

In the conventional adaptive cruise control system, the driver frequently presses the brake pedal and operates the ACC again during the ACC operation. For example, if the front car is dropped first at an intersection, when the front car suddenly stops, when the next lane car cuts to the near side, and when the front car changes lanes.

However, in the conventional adaptive cruise control system, when the driver depresses the brake pedal for a while and then operates the ACC again, there is an inconvenience to press the switch again to operate the ACC again.

Accordingly, there is a need for an improved adaptive cruise control system capable of operating the ACC again when the driver is able to temporarily release the brake pedal after the brake pedal is depressed.

(Document 1) Korean Patent Laid-Open Publication No. 2006-53652 (May 22, 2006) "Shift control device and method at constant speed traveling of an automatic transmission vehicle (Document 2) Korean Patent Publication No. 2008-32003 (Apr. 4, 2008) "Vehicle Travel Control Device"

It is an object of the present invention to temporarily resume the operation of the ACC mode when the driver depresses the brake pedal and then to restart the temporarily released ACC mode if there is no preceding vehicle, And to provide an adaptive cruise control system and method.

According to an aspect of the present invention, there is provided a vehicular navigation system comprising: a radar sensor installed in a vehicle and measuring forward information; and a predetermined distance or a predetermined distance from a target vehicle selected based on forward information measured by the radar sensor An adaptive cruise control system for controlling an accelerating / decelerating mode of the host vehicle so as to maintain a distance, the adaptive cruise control system comprising: A receiver for receiving a signal; A temporary release unit for temporarily releasing the operation of the adaptive cruise control mode when the brake input signal is received; And a controller for temporarily stopping the operation of the adaptive cruise control mode by the temporary release unit and, when receiving a brake return signal according to the release of the brake pedal, determining whether there is a preceding vehicle located in front of the child vehicle 1 < / RTI > condition and a satisfaction result of a second condition for determining whether the subject vehicle is in a dangerous situation, the adaptive cruise control mode A control system is provided.

And the receiving unit receives the position signal of the brake pedal from a brake pedal position sensor for measuring the position of the brake pedal.

Wherein when the speed of the subject vehicle is less than the control entry speed of the adaptive cruise control mode when the forward vehicle located in front of the subject vehicle does not exist as a result of the determination of the first condition, It is determined that the operation of the adaptive cruise control mode is to be restarted when the operation of the control mode is canceled and the speed of the subject vehicle is greater than the control entry speed of the adaptive cruise control mode.

The determination unit may determine a collision prediction time between the child vehicle and the preceding vehicle when a preceding vehicle positioned in front of the child vehicle exists and determine whether the child vehicle is in a dangerous condition based on the collision prediction time calculated .

Wherein the determining unit determines that the vehicle is in a dangerous situation according to the determination result of the second condition when the preceding vehicle exists in front of the subject vehicle as a result of the determination of the first condition, And to restart the operation of the adaptive cruise control mode in which the temporary release is not possible in the case of a dangerous situation.

According to another aspect of the present invention, there is provided a vehicle control system comprising: a radar sensor installed in a vehicle and measuring forward information; and a control unit for controlling the target vehicle based on the forward information measured by the radar sensor, A cruise control method of an adaptive cruise control system including an electronic control unit that performs an adaptive cruise control mode for controlling acceleration and deceleration of a vehicle, the cruise control method comprising: receiving a brake input signal according to a pressure applied to a brake pedal during operation in the adaptive cruise control mode ; Temporarily releasing the operation of the adaptive cruise control mode when the brake input signal is received; And a first condition for determining whether there is a preceding vehicle located in front of the subject vehicle when a brake return signal is received according to the release of the brake pedal after temporarily canceling the operation of the adaptive cruise control mode, And determining whether to restart or release the temporarily canceled adaptive cruise control mode according to a satisfaction result of the second condition for determining whether or not the dangerous situation is present.

Wherein if the speed of the subject vehicle is less than the control entry speed of the adaptive cruise control mode when the forward vehicle located in front of the subject vehicle does not exist as a result of the determination of the first condition, It is determined that the operation of the adaptive cruise control mode is canceled and the operation of the adaptive cruise control mode is resumed when the speed of the subject vehicle is greater than the control entry speed of the adaptive cruise control mode.

Wherein when the vehicle is in a dangerous situation according to a result of the determination of the second condition when there is a preceding vehicle located ahead of the subject vehicle as a result of the determination of the first condition, And to restart the operation of the adaptive cruise control mode in which the engine is temporarily released when the engine is not in a dangerous situation.

According to the embodiment of the present invention, if the driver depresses the brake pedal temporarily, the operation of the ACC mode is temporarily released, and if there is no preceding vehicle or there is a preceding vehicle, There is an effect that can be. Accordingly, it is possible to solve the inconvenience of pressing the switch in order to re-operate the ACC mode in the related art.

1 is a block diagram for explaining an adaptive cruise control system according to an embodiment of the present invention;
2 is a block diagram for explaining the electronic control unit shown in Fig. 1, and Fig.
3 is a flowchart illustrating an adaptive cruise control method of an adaptive cruise control system according to an embodiment of the present invention.

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

FIG. 1 shows a block diagram for explaining an adaptive cruise control system according to an embodiment of the present invention, and FIG. 2 shows a block diagram for explaining the electronic control unit shown in FIG.

Referring to FIG. 1, an adaptive cruise control system according to an embodiment of the present invention includes a sensor unit 10, a sensor unit 10, An engine control device 30 that drives under the control of the electronic control unit 20, and an electronic control unit 20 that controls the electronic control unit 20 to perform an adaptive cruise control mode (hereinafter referred to as " ACC mode " And a braking control device (40).

The sensor unit 10 includes a radar sensor, a vehicle speed sensor for measuring the speed of the vehicle, and a brake pedal position sensor for measuring the position of the brake pedal. The radar sensor measures the forward information and the information of the vehicle located in front of the vehicle, generates an acceleration command or a deceleration command based on the measured information and the information of the vehicle, and outputs the generated acceleration command or deceleration command to the electronic control Unit 20 as shown in FIG. The vehicle speed sensor measures the speed of the subject vehicle and provides the measured speed of the subject vehicle to the electronic control unit 20. [ The brake pedal position sensor provides the electronic control unit 20 with a position when the brake pedal is depressed or released.

When the electronic control unit 20 receives an input signal, that is, a switch ON signal, from the switch for instructing the operation to the ACC mode, the electronic control unit 20 performs the operation to the ACC mode. At this time, when the electronic control unit 20 receives the brake input signal from the sensor unit 10 when the driver presses the brake pedal while performing the ACC mode, the operation of the ACC mode is temporarily canceled and the brake return signal is received, And if the vehicle is not in a dangerous situation, it is determined to restart the temporarily released ACC mode, and if the brake return signal is not received, the vehicle speed is less than the ACC control entry speed, , But decides to release the operation of the temporarily released ACC mode in a dangerous situation.

The engine control device 30 is an EMS (Engine Management System), which controls an engine that converts combustion energy generated by combustion of fuel into kinetic energy.

The engine control device 30 is controlled by the electronic control unit 20 to control the driving of the engine. Specifically, the engine control device 30 controls the driving of the engine on the basis of the engine required torque transmitted from the electronic control unit 20. [ Controls the RPM of the engine to rise when the engine demand torque is transmitted from the electronic control unit 20, and controls the RPM of the engine to descend when the engine torque of the deceleration is transmitted.

The braking control device 40 can control the unillustrated hydraulic pressure control unit by the electronic control unit 20 with the ESC (Electronic Stability Control).

2, the electronic control unit 20 includes a receiving unit 21, a temporary releasing unit 22, a determining unit 23, an adaptive cruise control unit 24, and the like.

The receiving unit 21 receives information measured from the sensor unit 10, for example, forward information, the speed of the subject vehicle, and the position of the brake pedal. Here, based on the position of the brake pedal, it is possible to determine whether the brake pedal is the brake input signal or the brake pedal is not depressed, that is, the brake return signal when the brake pedal is released.

The receiving unit 21 also receives a switch signal for performing an operation from the driver to the ACC mode.

The adaptive cruise control unit 24 controls the adaptive cruise control unit 24 based on the switch signal for the operation in the ACC mode received by the receiver unit 21 while maintaining an appropriate distance from the target vehicle selected from the forward information received by the receiver unit 21, The acceleration / deceleration of the vehicle is controlled.

The temporary release unit 22 temporarily releases the operation of the ACC mode when the brake input signal is received through the reception unit 21 while the ACC mode is being performed by the adaptive cruise control unit 24. [

The determination unit 23 determines whether or not a brake input signal or a brake return signal has been received after the operation of the ACC mode is temporarily released by the temporary release unit 22, and when the brake input signal is received, And determines that the operation of the ACC mode, which is temporarily released automatically when the brake return signal is received, is restarted. However, when the brake return signal is received, the determining unit 23 determines whether there are two conditions: a first condition for determining whether a preceding vehicle exists in front of the subject vehicle, and a second condition for determining whether a dangerous situation exists if the preceding vehicle exists It is determined whether to automatically restart the operation of the ACC mode temporarily released or the operation of the ACC mode temporarily released. The second condition estimates the collision prediction time (TTC) using the speed of the subject vehicle and the distance between the subject vehicle and the target vehicle included in the forward information measured from the radar sensor, And a condition for judging a dangerous situation when a collision is predicted by comparing preset reference times.

The adaptive cruise control section 24 controls the operation of the ACC mode temporarily released according to the determination of the determination section 23 to be restarted or released. The adaptive cruise control unit 24 maintains a certain distance from the preceding vehicle and performs distance control and speed control.

The storage unit (not shown) stores the setting information set at the target vehicle and the headway distance when performing the ACC mode, and the set speed at which the ACC control entry speed is set when there is no preceding vehicle.

By doing so, the ACC mode can be automatically restarted according to the above-described conditions without releasing the operation of the ACC mode when the driver depresses the brake pedal during the ACC mode, It is possible to solve the inconvenience of pressing the switch again for operation in the mode.

The adaptive cruise control method of the adaptive cruise control system having such a configuration will now be described with reference to FIG.

3 is a flowchart illustrating an adaptive cruise control method of an adaptive cruise control system according to an embodiment of the present invention.

3, the electronic control unit 20 controls the acceleration / deceleration to set the operation mode of the subject vehicle to the ACC mode according to the ACC mode switch ON signal or the ACC mode driving signal for performing the ACC mode for self-traveling To operate the ACC mode (S11).

The electronic control unit 20 determines whether a brake input signal corresponding to the depression of the brake pedal is received during operation in the ACC mode (S13).

If it is determined in step S13 that the brake input signal is not received while the vehicle is operating in the ACC mode, the electronic control unit 20 moves the process to step S11 to operate the ACC mode in the operation mode. The ACC mode is a mode for controlling the acceleration / deceleration of the vehicle so as to select a target vehicle based on the forward information received from the radar sensor and to maintain a preset distance or interval with the selected target vehicle.

If it is determined in step S13 that the brake input signal is received while the vehicle is operating in the ACC mode, the electronic control unit 20 temporarily releases the ACC mode operation (S15).

Thereafter, the electronic control unit 20 determines whether a brake input signal or a brake return signal is received from the sensor unit 10 (S17). That is, the electronic control unit 20 determines whether a brake input signal has been received or a brake return signal has been received in order to determine whether or not the driver has pressed the brake pedal and then must perform the ACC mode again. If a brake input signal is received, it may be considered that the brake pedal is not depressed and released.

If it is determined in step S17 that the brake input signal is received, the electronic control unit 20 moves the process to step S15 described above so that the operation to the ACC mode temporarily released can be maintained.

If it is determined in step S17 that the brake return signal has been received, the electronic control unit 20 determines whether there is a preceding vehicle located in front of the subject vehicle based on the measured forward information from the radar sensor (S19). Here, the brake return signal includes a signal indicating the position of the brake pedal when the brake pedal is depressed and released, that is, when the brake pedal is released.

If it is determined in step S19 that there is no preceding vehicle, the electronic control unit 20 compares the speed of the subject vehicle with the ACC control entry speed to determine whether the speed of the subject vehicle is smaller than the ACC control entry speed S20). Here, the ACC control entry speed means the minimum speed for ACC operation when there is no preceding vehicle.

If it is determined in step S20 that the speed of the subject vehicle is greater than the ACC control entry speed, the electronic control unit 20 moves the process to step S11 described above so as to restart the ACC mode temporarily released.

If it is determined in step S20 that the speed of the subject vehicle is smaller than the ACC control entry speed, the electronic control unit 20 cancels the operation of the ACC mode temporarily released (S23).

If it is determined in step S19 that the preceding vehicle exists, the electronic control unit 20 determines whether the vehicle is in a dangerous situation (S21). That is, the electronic control unit 20 determines that the collision is predicted based on the collision prediction time between the subject vehicle and the target vehicle based on the forward information measured from the radar sensor.

If it is determined in step S21 that the subject vehicle is not in a dangerous state, the electronic control unit 20 moves the process to step S11 described above so as to restart the ACC mode temporarily released.

As a result of the determination in step S21, when the subject vehicle is in a dangerous state, the electronic control unit 20 moves the process to step S23 described above to release the operation of the ACC mode that is temporarily released.

When the driver depresses the brake pedal during the ACC mode operation, the ACC mode is temporarily released and then the ACC mode is temporarily released when there is a dangerous situation. It is possible to eliminate the inconvenience of pressing the switch to restart the mode.

The invention being thus described, it will be obvious that the same way may be varied in many ways. Such modifications are intended to be within the spirit and scope of the invention as defined by the appended claims.

10: sensor unit 20: electronic control unit
21: Receiving unit 23:
24: Decision section 25: Adaptive cruise control section
30: Engine control device 40: Braking control device

Claims (8)

And an adaptive cruise control unit that controls acceleration and deceleration of the subject vehicle so as to maintain a predetermined gap or distance from the selected target vehicle based on the forward information measured by the radar sensor, An adaptive cruise control system comprising an electronic control unit performing a control mode,
A receiver for receiving a brake input signal corresponding to a pressure applied to the brake pedal during operation in the adaptive cruise control mode;
A temporary release unit for temporarily releasing the operation of the adaptive cruise control mode when the brake input signal is received; And
Wherein when the brake release signal is received after the brake pedal is released after temporarily canceling the operation of the adaptive cruise control mode by the temporary release unit, And determining whether to resume or release the temporarily released adaptive cruise control mode according to a condition and a satisfaction result of a second condition for determining whether the subject vehicle is in a dangerous situation or not. system. The method according to claim 1,
Wherein the receiving unit receives the position signal of the brake pedal from a brake pedal position sensor that measures the position of the brake pedal. The method according to claim 1,
The determination unit
If the speed of the subject vehicle is less than the control entry speed of the adaptive cruise control mode as a result of the determination of the first condition and there is no forward vehicle located in front of the subject vehicle, And when the speed of the subject vehicle is greater than the control entry speed of the adaptive cruise control mode, determines to resume the operation of the temporarily released adaptive cruise control mode. The method according to claim 1,
The determination unit
When there is a preceding vehicle located in front of the child vehicle, calculating a collision prediction time between the child vehicle and the preceding vehicle and determining whether the child vehicle is in a dangerous condition based on the calculated collision prediction time The adaptive cruise control system. The method according to claim 1,
Wherein the determining unit determines that the vehicle is in a dangerous situation according to the determination result of the second condition when the preceding vehicle exists in front of the subject vehicle as a result of the determination of the first condition, And determines to restart the operation of the adaptive cruise control mode in which the engine is temporarily released when the engine is not in a dangerous state. An adaptive cruise control system for controlling the acceleration / deceleration of the subject vehicle so as to maintain a predetermined distance or distance from the selected target vehicle based on the forward information measured by the radar sensor, A cruise control method of an adaptive cruise control system including an electronic control unit performing a mode,
Receiving a brake input signal in response to a pressure applied to the brake pedal during operation in the adaptive cruise control mode;
Temporarily releasing the operation of the adaptive cruise control mode when the brake input signal is received; And
A first condition for determining whether a preceding vehicle located in front of the subject vehicle exists when a brake return signal is received after the brake pedal is released after temporarily canceling the operation of the adaptive cruise control mode, Determining whether to restart or cancel the adaptive cruise control mode that was temporarily released according to a satisfaction result of a second condition for determining whether or not the vehicle is in a dangerous situation. The method of claim 6,
The step of determining
If the speed of the subject vehicle is less than the control entry speed of the adaptive cruise control mode as a result of the determination of the first condition and there is no forward vehicle located in front of the subject vehicle, And to restart the operation of the adaptive cruise control mode when the speed of the subject vehicle is greater than the control entry speed of the adaptive cruise control mode. The method of claim 6,
The step of determining
If there is a preceding vehicle located ahead of the subject vehicle as a result of the determination of the first condition, releasing the operation of the temporarily released adaptive cruise control mode in the case of a dangerous situation according to the determination result of the second condition, The adaptive cruise control mode determining means determines to re-operate the operation of the temporarily released adaptive cruise control mode.

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