阅读说明：本技术 一种车辆紧急制动控制方法及控制系统 (Vehicle emergency braking control method and control system ) 是由 姬佩君 李慧敏 张滕滕 郭凤骏 李政 娄臻亮 于 2018-05-29 设计创作，主要内容包括：本发明公开了一种车辆紧急制动控制方法及控制系统,该控制方法根据所获取的距离与相对运动速度计算以紧急制动策略对车辆进行制动时车辆与障碍物发生碰撞时刻的碰撞速度,以及自当前时刻至碰撞时刻的时间段,以碰撞速度高于气囊点爆速度并且所述时间段小于预设时间段为条件,降低对车辆的制动强度以使乘坐人员与气囊的相对位移量在预定范围内；这样有利于保证乘坐人员和前方气囊或者前方约束系统之间的距离处于安全距离,避免碰撞时乘坐人员与气囊之间距离过小导致二者相对位移量大,进而导致气囊对乘坐人员压迫程度高现象的发生,有利于保护乘坐人员的乘坐安全性。(The invention discloses a vehicle emergency braking control method and a control system, wherein the control method calculates the collision speed of a vehicle and an obstacle at the moment of collision when the vehicle is braked by an emergency braking strategy according to the acquired distance and relative movement speed, and reduces the braking intensity of the vehicle to enable the relative displacement between a passenger and an air bag to be within a preset range on the condition that the collision speed is higher than the explosion speed of the air bag and the time period is less than a preset time period from the current moment to the collision moment; the distance between the passenger and the front air bag or the front restraint system is ensured to be at a safe distance, the phenomenon that the passenger is stressed by the air bag to a high degree due to large relative displacement of the passenger and the air bag caused by an excessively small distance between the passenger and the air bag during collision is avoided, and the safety of the passenger is protected.)

1. A vehicle emergency braking control method is characterized by comprising the following specific contents:

S1, acquiring the distance between the vehicle and the obstacle and the relative movement speed between the vehicle and the obstacle at the current moment;

And S2, calculating the collision speed of the vehicle and the obstacle when the vehicle is braked by an emergency braking strategy according to the acquired distance and the relative movement speed, and reducing the braking strength of the vehicle to enable the relative displacement between the passenger and the airbag to be within a preset range on the condition that the collision speed is higher than the airbag detonation speed and the time period is less than a preset time period from the current time to the collision time.

2. the vehicle emergency braking control method according to claim 1, wherein in step S2, on condition that the collision speed is higher than the airbag ignition speed and that the time period is greater than or equal to a preset time period, controlling brakes the vehicle in the current emergency braking strategy.

3. The vehicle emergency braking control method according to claim 1, wherein in step S2, if the collision speed is lower than the airbag detonation speed, the vehicle is braked with the current emergency braking strategy.

4. the vehicle emergency brake control method according to any one of claims 1 to 3, wherein the step S1 further includes acquiring an attitude signal of the occupant in the vehicle in real time;

when it is determined in step S2 that the collision speed is higher than the airbag detonation speed and the time period is less than the preset time period, further determining the displacement amount of the occupant relative to the airbag at the time of airbag deployment based on the acquired occupant posture signal, and if the displacement amount of the occupant relative to the airbag is greater than a predetermined displacement amount, reducing the braking strength on the vehicle until the forward tilting amount of the occupant is within a prescribed range; otherwise, braking the vehicle according to the current emergency braking strategy.

5. The vehicle emergency braking control method according to claim 4, wherein the posture signal of the occupant is acquired by a camera.

6. The vehicle emergency braking control method according to claim 1, wherein the braking intensity of the vehicle is reduced according to the following principle: the higher the calculated collision speed, the greater the magnitude of the reduction in braking intensity.

7. A vehicle emergency brake control system, comprising:

An acquisition means for acquiring a distance between the vehicle and the obstacle and a relative movement speed between the vehicle and the obstacle;

The controller comprises a storage module and a judgment module;

The storage module stores the explosion speed of the air bag, a preset time period and an emergency braking strategy;

The judgment module calculates the collision speed of the vehicle and the obstacle at the moment of collision when the vehicle is braked by an emergency braking strategy according to the acquired distance and the relative movement speed, and reduces the braking strength of the vehicle to enable the relative displacement between the passenger and the airbag to be within a preset range on the condition that the collision speed is higher than the airbag detonation speed and the time period is less than a preset time period from the current moment to the collision moment.

8. The vehicle emergency braking control system of claim 7, wherein the determining module further controls braking of the vehicle with the current emergency braking strategy on a condition that the collision speed is higher than an airbag detonation speed and the time period is greater than or equal to a preset time period.

9. the vehicle emergency brake control system of claim 7, further comprising a camera disposed inside the vehicle compartment for acquiring an attitude signal of a passenger in the vehicle in real time; the storage module is further stored with a preset displacement;

The judgment module judges whether the collision speed is higher than the airbag detonation speed and whether the time period is smaller than a preset time period, and further judges the displacement of the occupant relative to the airbag when the airbag is unfolded according to the acquired attitude signal of the occupant, and if the displacement of the occupant relative to the airbag is larger than a preset displacement, the braking strength of the vehicle is reduced so that the forward tilting amount of the occupant is within a specified range; otherwise, braking the vehicle according to the current emergency braking strategy.

Technical Field

The invention belongs to the technical field of automobile door opening and closing force testing, and particularly relates to a vehicle emergency braking control method and a vehicle emergency braking control system.

Background

the emergency braking system can perform emergency braking operation to avoid collision or mitigate damage caused by collision in case of vehicle running emergency.

The existing vehicle emergency braking strategy is established under the condition of considering the relative speed and distance between a vehicle and an obstacle, and collision is avoided or the collision strength is reduced through emergency braking. However, vehicle emergency braking, particularly if the occupant is not prepared, can cause significant forward leaning movement of the occupant, which can cause discomfort to the occupant and may even have some impact on occupant protection.

Sometimes, collision is inevitable, in order to reduce the injury of the collision to passengers in the vehicle as much as possible, the current vehicle is provided with a protective air bag, when the collision speed of the vehicle and an obstacle reaches the explosion velocity of the air bag, the air bag can be unfolded to protect the passengers in the vehicle, and the impact force of the collision to the passengers is reduced.

However, during actual vehicle driving, there are also many accidents in which the airbag is injured by the occupant during high-speed deployment, and particularly, in emergency braking, the problem is more pronounced when the occupant leans forward and the distance between the airbags is small.

Therefore, how to provide an emergency braking method for protecting passengers in a vehicle to the maximum extent under the condition that collision is unavoidable is a technical problem to be solved urgently by the technical personnel in the field.

Disclosure of Invention

The invention provides a vehicle emergency braking control method, which comprises the following specific contents:

S1, acquiring the distance between the vehicle and the obstacle and the relative movement speed between the vehicle and the obstacle at the current moment;

and S2, calculating the collision speed of the vehicle and the obstacle when the vehicle is braked by an emergency braking strategy according to the acquired distance and the relative movement speed, and reducing the braking strength of the vehicle to enable the relative displacement between the passenger and the airbag to be within a preset range on the condition that the collision speed is higher than the airbag detonation speed and the time period is less than a preset time period from the current time to the collision time.

according to the invention, through calculating the collision speed in advance, if the collision speed is higher than the airbag detonation speed, namely the collision speed is higher, the braking strength to the vehicle is reduced in a short time before the collision occurs, so that the distance between the passenger and the front airbag or the front restraint system is ensured to be in a safe distance, the phenomenon that the distance between the passenger and the airbag is too small during the collision so as to cause large relative displacement between the passenger and the airbag and further cause a phenomenon that the airbag has high compression degree to the passenger is avoided, and the safety of the passenger is protected.

optionally, in step S2, on the condition that the collision speed is higher than the airbag detonation speed and the time period is greater than or equal to the preset time period, controlling to brake the vehicle with the current emergency braking strategy.

optionally, in step S2, if the collision speed is lower than the airbag detonation speed, the vehicle is braked with the current emergency braking strategy.

Optionally, in step S1, further acquiring a posture signal of a passenger in the vehicle in real time;

when it is determined in step S2 that the collision speed is higher than the airbag detonation speed and the time period is less than the preset time period, further determining the displacement amount of the occupant relative to the airbag at the time of airbag deployment based on the acquired occupant posture signal, and if the displacement amount of the occupant relative to the airbag is greater than a predetermined displacement amount, reducing the braking strength on the vehicle until the forward tilting amount of the occupant is within a prescribed range; otherwise, braking the vehicle according to the current emergency braking strategy.

Optionally, the attitude signal of the passenger is acquired through the camera.

Alternatively, the higher the calculated collision velocity, the greater the magnitude of the reduction in braking intensity.

In addition, the invention also provides a vehicle emergency braking control system, which comprises the following components:

An acquisition means for acquiring a distance between the vehicle and the obstacle and a relative movement speed between the vehicle and the obstacle;

the controller comprises a storage module and a judgment module;

The storage module stores the explosion speed of the air bag, a preset time period and an emergency braking strategy;

The judgment module calculates the collision speed of the vehicle and the obstacle at the moment of collision when the vehicle is braked by an emergency braking strategy according to the acquired distance and the relative movement speed, and reduces the braking strength of the vehicle to enable the relative displacement between the passenger and the airbag to be within a preset range on the condition that the collision speed is higher than the airbag detonation speed and the time period is less than a preset time period from the current moment to the collision moment.

Optionally, the determining module further controls to brake the vehicle by using the current emergency braking strategy on the condition that the collision speed is lower than the airbag detonation speed and the time period is greater than or equal to a preset time period.

Optionally, the system further comprises a camera, which is arranged inside the carriage and used for acquiring the attitude signal of the passenger in the vehicle in real time; the storage module is further stored with a preset displacement;

the judgment module judges whether the collision speed is higher than the airbag detonation speed and whether the time period is smaller than a preset time period, and further judges the displacement of the occupant relative to the airbag when the airbag is unfolded according to the acquired attitude signal of the occupant, and if the displacement of the occupant relative to the airbag is larger than a preset displacement, the braking strength of the vehicle is reduced so that the forward tilting amount of the occupant is within a specified range; otherwise, braking the vehicle according to the current emergency braking strategy.

drawings

FIG. 1 is a flow chart of a method for controlling emergency braking of a vehicle in accordance with an embodiment of the present invention;

FIG. 2 is a flow chart of a method for controlling emergency braking of a vehicle according to another embodiment of the present invention;

Fig. 3 is a block diagram of a novel vehicle emergency brake control system provided by the invention.

Detailed Description

aiming at the technical problem that the air bag proposed in the background art damages passengers in the high-speed opening process, intensive research is carried out, and the research finds that: when a collision is unavoidable and the collision speed of a vehicle and an obstacle reaches the airbag detonation speed, the greater the displacement amount of an occupant relative to an airbag, the stronger the pressing force of the airbag on the occupant, particularly the compression amount of the chest of the occupant relative to the airbag, directly affects the degree of injury of the airbag on the occupant.

That is, when the vehicle collides with an obstacle, the closer the occupant is to the airbag, the more likely it is to be injured.

On the basis of the above research findings, a new vehicle emergency braking control method is proposed herein, which is described in detail as follows.

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the following, control methods, control systems, drawings, and specific embodiments.

Referring to fig. 1 and 3, fig. 1 is a flow chart illustrating a method for controlling emergency braking of a vehicle according to an embodiment of the present invention; fig. 3 is a block diagram of a novel vehicle emergency brake control system provided by the invention.

The invention provides a vehicle emergency braking control method, which comprises the following specific contents:

s1, acquiring the distance between the vehicle and the obstacle and the relative movement speed between the vehicle and the obstacle at the current moment;

the parameters of the distance and the relative movement speed can be obtained through an obtaining component, the obtaining component can be a sensor arranged in front of the vehicle or at other positions, for example, the distance between the vehicle and an obstacle can be obtained through a displacement sensor, and the relative movement speed can be obtained through measuring the distance through a camera or a radar and then calculating through a controller.

The number and the installation position of the sensors are not exclusive, and the number may be one or two or more. Preferably to the front end of the vehicle.

S2, calculating the collision speed of the vehicle and the obstacle through an emergency braking strategy according to the acquired distance and the relative movement speed, and reducing the braking strength of the vehicle under the condition that the collision speed is higher than the airbag detonation speed and the time period is less than the preset time period from the current moment to the collision moment.

Correspondingly, the vehicle emergency braking control system comprises a controller, wherein the controller further comprises a storage module and a judgment module; the storage module stores the explosion speed of the air bag, a preset time period and an emergency braking strategy; it should be noted that the emergency braking strategy refers to the braking strategy with the maximum braking intensity. The airbag detonation velocity refers to the lowest collision velocity at which the airbag is deployed as calibrated for the vehicle.

the judgment module calculates the collision speed of the vehicle and the obstacle when the vehicle is braked by an emergency braking strategy according to the acquired distance and the relative movement speed, and reduces the braking intensity of the vehicle under the condition that the collision speed is higher than the airbag detonation speed and the time period is less than a preset time period from the current time to the collision time.

In terms of reducing the braking intensity of the vehicle, the controller may automatically set a braking mode lower than the current emergency braking strategy, and of course, the controller may also issue a display instruction to inform the driver that the driver is automatically reducing the braking intensity of the vehicle. The brake intensity can be adjusted by using the existing device and method, for example, the brake intensity is adjusted by adjusting the opening degree of the brake valve.

That is, when the controller determines that the collision speed is higher than the airbag detonation speed and that the time period is less than the preset time period, the controller may automatically reduce the vehicle braking intensity, and may also prompt the operator to reduce the braking intensity.

according to the invention, through calculating the collision speed in advance, if the collision speed is higher than the airbag detonation speed, namely the collision speed is higher, the braking strength to the vehicle is reduced in a short time before the collision occurs, so that the distance between the passenger and the front airbag or the front restraint system is ensured to be in a safe distance, the phenomenon that the distance between the passenger and the airbag is too small during the collision so as to cause large relative displacement between the passenger and the airbag and further cause a phenomenon that the airbag has high compression degree to the passenger is avoided, and the safety of the passenger is protected.

Further, in step S2, on the condition that the collision speed is higher than the airbag ignition speed and the time period is greater than or equal to the preset time period, the vehicle is controlled to be braked by the current emergency braking strategy. That is, although the determination module of the controller determines that the vehicle and the obstacle may collide with each other, the time period from the current time to the time of the collision is greater than the preset time period, it is determined that the collision speed should be reduced as much as possible at this stage, and therefore, the vehicle is braked according to the current emergency braking strategy.

Step S2 specifically includes:

S21, judging whether the collision speed is higher than the airbag detonation speed, if so, executing a step S22, otherwise, executing a step S24;

S22, judging whether the time period is less than the preset time period, if so, executing the step S23, otherwise, executing the step S24;

s23, reducing the braking strength of the vehicle to make the relative displacement between the passenger and the airbag in a preset range;

and S24, braking according to the current emergency braking strategy, and returning to S22.

The preset time period may be specifically set according to different vehicles, and in one specific vehicle, the preset time period may range from 0.3 second to 1 second, and preferably the preset time period is 0.5 second.

the above control method may be further optimized, and the details are described below.

referring to fig. 2, fig. 2 is a flowchart illustrating a method for controlling emergency braking of a vehicle according to another embodiment of the present invention.

Step S1 can further obtain the attitude signal of the passenger in the vehicle in real time; when it is determined in step S2 that the collision speed is higher than the airbag detonation speed and the time period is less than the preset time period, further determining the displacement amount of the occupant relative to the airbag at the time of airbag deployment based on the acquired occupant posture signal, and if the displacement amount of the occupant relative to the airbag is greater than a predetermined displacement amount, reducing the braking strength to the vehicle; otherwise, braking the vehicle according to the current maximum braking intensity strategy.

The above-mentioned every judgement step is carried on by judging the module. Accordingly, the predetermined displacement amount may be stored in the storage module.

that is, step S2 is specifically:

S21, judging whether the collision speed is higher than the airbag detonation speed, if so, executing a step S22, otherwise, executing a step S24;

S22, judging whether the time period is less than a preset time period, if so, executing the step S231, otherwise, executing the step S24;

s231, judging the magnitude of the calculated displacement and the predetermined displacement, and executing S232 if the magnitude of the calculated displacement and the predetermined displacement are less than or equal to each other; otherwise, go to step S24;

S232, reducing the braking strength of the vehicle until the forward tilting amount of the passenger is in a specified range;

And S24, braking according to the current emergency braking strategy, and returning to S231.

The above-mentioned personnel's of taking gesture signal can acquire through the camera, and the camera can be installed and be convenient for gather personnel's of taking gesture signal in real time in carriage inside.

the posture signal of the passenger is generally the position of each part of the body of the passenger, generally the upper body position.

in the above embodiment, the posture of the occupant in the vehicle is fully considered during emergency braking of the vehicle, when it is determined that the distance between the occupant in the vehicle and the airbag or the front restraint system device is small during collision, that is, the forward tilting amplitude of the occupant in the vehicle is relatively large, the controller controls and reduces the braking strength of the vehicle, so as to reduce the forward tilting of the body of the occupant due to braking deceleration, increase the distance between the occupant and the front restraint system device, and maintain the current braking strength until collision when the forward tilting amount of the body of the occupant meets the collision protection requirement due to the braking strength.

In the embodiments, the braking strength of the vehicle can be reduced according to the following principles: the higher the calculated collision speed, the greater the magnitude of the reduction in braking intensity. I.e. on the basis of the emergency braking intensity and the calculated collision speed. Under the condition of predicting high-speed collision, in order to avoid the damage of the airbag to the passenger and ensure enough space between the passenger and the airbag when the collision is close to, the braking strength should be lower; in the case where the predicted collision speed is low but the airbag is exploded, the occupant space required to avoid the airbag from injuring the occupant is small, and thus the braking strength can be relatively high.

the vehicle emergency brake control system herein can implement the above control method, so the vehicle emergency brake control system also has the above technical effects of the above control method.

the vehicle emergency braking control method and the vehicle emergency braking control system provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.