Temporary adjustment method of lane keeping auxiliary system in overtaking process

Abstract

The invention relates to the technical field of safe driving, in particular to a temporary adjustment method of a lane keeping auxiliary system in an overtaking process, which comprises the following steps: acquiring a longitudinal distance between a vehicle and a large vehicle in front, the large vehicle being located in an adjacent lane; on the basis of the longitudinal distance between the vehicle and the large vehicle in front and the driving characteristics of the vehicle, the lane keeping auxiliary system is controlled to be turned off and recovered; according to the invention, when the longitudinal distance between the vehicle and the front large vehicle in the adjacent lane is within a certain range, whether the lane keeping auxiliary system of the vehicle is turned off is judged by judging whether the driving characteristics of the vehicle include the overtaking characteristics, so that the vehicle is ensured not to be interfered by the lane keeping auxiliary system when exceeding the large vehicle; man-machine conflicts caused by intervention of the lane keeping auxiliary system triggered by overtaking when a driver does not turn on a steering lamp can be simply and effectively avoided, and it is ensured that a vehicle can smoothly overtake according to control of the driver.

Description

Technical Field

[0001] The present invention relates to the technical field of safe driving, and in particular to a temporary adjustment method of a lane keeping assist system during an overtaking process. Background Art

[0002] When the driver is driving the vehicle on the highway, the vehicle will turn on the lane keeping assist system to prevent the driver from deviating from the lane due to distraction or fatigue. When the system detects that the vehicle deviates from the lane, it will issue a warning signal, such as steering wheel vibration or instrument panel prompt; when the driver drives the outer edge of the front wheel of the vehicle across the lane line, the vehicle can also automatically intervene in the steering to force the trajectory to be corrected. If the turn signal is turned on before crossing the lane line, the system will determine that the driver is consciously changing lanes, and the warning signal will be blocked. However, when the driver parallel overtakes a large vehicle, in order to avoid the body shaking caused by the airflow, the driver will generally keep a safe lateral distance of at least 1.5 meters from the large vehicle (overtaking from the left side of the large vehicle will move to the left away from the large vehicle, and overtaking from the right side of the large vehicle will move to the right away from the large vehicle), which may cause the vehicle to approach or press the current lane line (left lane line or right lane line). Since the turn signal (left turn signal or right turn signal) is not turned on, the lane keeping assist system recognizes that the vehicle has deviated from the lane, and the system will apply the opposite steering force through the steering wheel to intervene in the steering (to the right or left) to prevent the vehicle from deviating from the lane. At this time, the human-machine conflict caused by the steering intervention automatically triggered by the lane keeping assist system may cause the driver to feel confused, uneasy, and nervous, and may even further induce traffic accidents due to improper operation.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a temporary adjustment method for the lane keeping assist system during overtaking, which can effectively avoid the human-machine conflict caused by the driver overtaking and crossing the line without turning on the turn signal, thereby ensuring that the vehicle successfully completes the overtaking according to the driver's control.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a temporary adjustment method of a lane keeping assist system during overtaking, comprising the following steps:

[0007] S1. Obtaining the longitudinal distance between the vehicle and the large vehicle ahead, where the large vehicle is located in an adjacent lane;

[0008] S2. Controlling the lane keeping assist system to be turned on and off based on the longitudinal distance between the vehicle and the large vehicle ahead and the driving characteristics of the vehicle.

[0009] Specifically, in S2, the method for controlling the on and off of the lane keeping assist system is as follows:

[0010] When the longitudinal vehicle distance between the host vehicle and the large vehicle ahead is greater than or equal to the set distance, the lane keeping assist system is turned on; when the longitudinal vehicle distance between the host vehicle and the large vehicle ahead is less than the set distance, if the driving characteristics of the host vehicle do not include overtaking characteristics, the lane keeping assist system is turned on, and if the driving characteristics of the host vehicle include overtaking characteristics, the lane keeping assist system is turned off until the driving characteristics of the host vehicle do not include overtaking characteristics, and the lane keeping assist system is turned on.

[0011] Specifically, the overtaking characteristics include at least one of a first characteristic, a second characteristic, a third characteristic, and a fourth characteristic;

[0012] The first characteristic is that the host vehicle moves laterally away from and longitudinally approaches the large vehicle and honks;

[0013] The second characteristic is that the host vehicle moves laterally away from and longitudinally approaches the large vehicle and the host vehicle flashes the high beam;

[0014] The third characteristic is that the host vehicle moves laterally away from and longitudinally approaches the large vehicle and the host vehicle accelerates;

[0015] The fourth characteristic is that the host vehicle moves laterally away from and longitudinally approaches the large vehicle, and it is detected that the lateral distance between the obstacle ahead and the large vehicle is less than the first threshold and the braking deceleration of the host vehicle is greater than the second threshold.

[0016] Specifically, the first threshold is 2.5 m to 3.5 m, and the second threshold is 0.2 g.

[0017] Specifically, the set distance is 45 m to 55 m.

[0018] Specifically, the longitudinal vehicle distance between the host vehicle and the large vehicle ahead is obtained through a front camera, and the front camera is installed on the front windshield.

[0019] Specifically, the acceleration or deceleration of the host vehicle is monitored through an acceleration sensor installed at the center of gravity of the vehicle.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] When the longitudinal distance between the host vehicle and the large vehicle ahead in the adjacent lane is within a certain range, the present invention determines whether the lane keeping assist system of the host vehicle is turned on by detecting whether the host vehicle includes overtaking characteristics, ensuring that the host vehicle is not interfered by the lane keeping assist system when overtaking the large vehicle, and can simply and effectively avoid the human-machine conflict caused by the lane keeping assist system being triggered by overtaking when the driver does not turn on the turn signal, ensuring that the vehicle can complete overtaking smoothly according to the driver's operation. Description of the Drawings

[0022] Figure 1 Schematic diagram of signal acquisition of the lane keeping assist system of the present invention;

[0023] Figure 2 Center of gravity trajectory diagram of a large vehicle in front during overtaking of the host vehicle on a highway according to the present invention; Specific embodiments

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] Embodiment

[0026] Generally, when a vehicle behind on a highway overtakes a large vehicle in front, it has to go through five major stages: longitudinal approach, lateral departure, parallel overtaking, lateral correction, and overtaking completion. That is to say, before the driver overtakes a large vehicle in the adjacent lane, while approaching longitudinally, the driver will slightly adjust the steering wheel to make the host vehicle deviate from the center line of the lane and laterally depart from the large vehicle being overtaken. When the lateral offset of the host vehicle ≥ 30 cm, it basically remains unchanged. This process is the lateral departure stage before overtaking. When the host vehicle presses on the lane line due to lateral departure from the large vehicle, the lane keeping assist system of the host vehicle will perform steering intervention, and it is easy to have a human-machine conflict.

[0027] This embodiment proposes a temporary adjustment method of the lane keeping assist system during overtaking. The lane keeping assist system ECU obtains vehicle lateral offset, acceleration, deceleration, horn honking signal, high beam flashing signal, and image information collected by the front camera through the CAN bus interface. The temporary adjustment method specifically includes the following steps:

[0028] S1. Monitor the image information in front of the host vehicle through the front camera to obtain the longitudinal vehicle distance between the host vehicle and the large vehicle in front in the adjacent lane (left lane or right lane). The front camera is installed on the front windshield in front of the interior rearview mirror. The large vehicle is a vehicle with a body width greater than or equal to 2.2 m.

[0029] S2. When the longitudinal vehicle distance between the host vehicle and the large vehicle in front in the adjacent lane detected by the front camera is greater than or equal to the set distance, the lane keeping assist system is normally turned on. The set distance is 45 m to 55 m, and 50 m is preferably selected in this embodiment.

[0030] When the current camera detects that the longitudinal distance between the host vehicle and the large vehicle in the adjacent lane ahead is less than the set distance, if the driving characteristics of the host vehicle do not include overtaking characteristics, the lane keeping assist system is turned on. If the driving characteristics of the host vehicle include overtaking characteristics, the lane keeping assist system is turned off until the driving characteristics of the host vehicle do not include overtaking characteristics, and then the lane keeping assist system is turned on again;

[0031] The overtaking characteristics include at least one of the first characteristic, the second characteristic, the third characteristic, and the fourth characteristic; that is, as long as the driving characteristics of the host vehicle include more than one of the first characteristic, the second characteristic, the third characteristic, and the fourth characteristic, the lane keeping assist system is turned off;

[0032] The first characteristic is that the host vehicle moves laterally away from and longitudinally approaches the large vehicle and honks;

[0033] The second characteristic is that the host vehicle moves laterally away from and longitudinally approaches the large vehicle and the host vehicle flashes the high beam;

[0034] The third characteristic is that the host vehicle moves laterally away from and longitudinally approaches the large vehicle and the host vehicle accelerates;

[0035] The fourth characteristic is that the host vehicle moves laterally away from and longitudinally approaches the large vehicle, and it is detected that the lateral distance between the obstacle ahead and the large vehicle is less than the first threshold and the braking deceleration of the host vehicle is greater than the second threshold; the first threshold is 2.5m to 3.5m, and 2.5m is preferably selected in this embodiment; the second threshold is 0.2g;

[0036] Whether the vehicle accelerates in the third characteristic is determined by the acceleration sensor installed at the center of gravity of the vehicle. When the acceleration sensor monitors that the acceleration of the host vehicle is greater than 0, it is determined that the host vehicle accelerates.

[0037] In the fourth characteristic, the braking deceleration of the host vehicle is also monitored by the acceleration sensor installed at the center of gravity of the vehicle.

[0038] When the lane keeping assist system of the present invention receives that the longitudinal distance between the host vehicle and the large vehicle in the adjacent lane ahead is within a certain range, it further determines whether to turn off by whether it receives the overtaking characteristics, which simply and effectively avoids the man-machine conflict during overtaking and ensures that the vehicle can complete overtaking smoothly according to the driver's operation.

[0039] The specific implementation manners of the present invention enable those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0040] It should be understood that the present invention is not limited to the above-described content and can be variously modified and changed without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A temporary adjustment method for a lane keeping assist system during overtaking, characterized in that, Including the following steps: S1. Obtain the longitudinal vehicle distance between the host vehicle and a large vehicle ahead, where the large vehicle is in an adjacent lane; S2. Control the turning on and off of the lane keeping assist system based on the longitudinal vehicle distance between the host vehicle and the large vehicle ahead and the driving characteristics of the host vehicle.

2. The temporary adjustment method of the lane keeping assist system according to claim 1 during overtaking, characterized in that In S2, the method for controlling the turning on and off of the lane keeping assist system is as follows: When the longitudinal vehicle distance between the host vehicle and the large vehicle ahead is greater than or equal to the set distance, the lane keeping assist system is turned on; when the longitudinal vehicle distance between the host vehicle and the large vehicle ahead is less than the set distance, if the driving characteristics of the host vehicle do not include an overtaking feature, the lane keeping assist system is turned on, and if the driving characteristics of the host vehicle include an overtaking feature, the lane keeping assist system is turned off until the driving characteristics of the host vehicle do not include an overtaking feature, and then the lane keeping assist system is turned on.

3. The temporary adjustment method of the lane keeping assist system according to claim 2 during overtaking, characterized in that The overtaking feature includes at least one of a first feature, a second feature, a third feature, and a fourth feature; The first feature is that the host vehicle moves laterally away from and longitudinally approaches the large vehicle and honks; The second feature is that the host vehicle moves laterally away from and longitudinally approaches the large vehicle and the host vehicle flashes the high beam; The third feature is that the host vehicle moves laterally away from and longitudinally approaches the large vehicle and the host vehicle accelerates; The fourth feature is that the host vehicle moves laterally away from and longitudinally approaches the large vehicle, the detected lateral distance between the obstacle ahead and the large vehicle is less than the first threshold, and the braking deceleration of the host vehicle is greater than the second threshold.

4. The temporary adjustment method of the lane keeping assist system according to claim 3 during overtaking, characterized in that, The first threshold is 2.5 m to 3.5 m, and the second threshold is 0.2g.

5. The temporary adjustment method of the lane keeping assist system according to claim 2 during overtaking, characterized in that The set distance is 45 m to 55 m.

6. The method for temporary adjustment of the lane keeping assist system according to claim 1 during overtaking, characterized in that, Obtain the longitudinal vehicle distance between the host vehicle and the large vehicle ahead through a front camera, and the front camera is installed on the front windshield.

7. The temporary adjustment method of the lane keeping assist system according to claim 1 during overtaking, characterized in that, Monitor the acceleration or deceleration of the host vehicle through an acceleration sensor installed at the center of gravity of the vehicle.

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