阅读说明：本技术 一种车辆碰撞后保护系统及方法 (Vehicle collision protection system and method ) 是由 苏常军 张杰勇 黄亚洲 张永强 李树春 王辉 郭兴峰 杨方影 张叶剑 其他发明人请 于 2021-08-09 设计创作，主要内容包括：本发明涉及一种车辆碰撞后保护系统及方法,车辆碰撞后保护系统主要由碰撞传感器、控制器、油门踏板位置传感器、制动踏板位置传感器、车速传感器、挡位传感器、仪表、制动系统控制器、动力系统控制器构成,碰撞传感器设有多个,分别布置在车辆前侧、后侧、左侧、右侧,碰撞发生后,控制器根据各碰撞传感器输出的电流或电压信号识别碰撞位置,通过仪表进行警示并结合车速、挡位信息、油门踏板开度、制动踏板开度通过动力系统控制器与制动系统控制器对车辆采取保护举措,本发明中在制定车辆保护举措时兼顾考虑到碰撞位置、车辆运行状态与驾驶意图,能够实现精确保护,降低碰撞后引发恶性交通事故的风险。(The invention relates to a vehicle collision post-protection system and a method, the vehicle collision post-protection system mainly comprises a plurality of collision sensors, a controller, an accelerator pedal position sensor, a brake pedal position sensor, a vehicle speed sensor, a gear sensor, an instrument, a brake system controller and a power system controller, the collision sensors are respectively arranged at the front side, the rear side, the left side and the right side of a vehicle, after collision occurs, the controller identifies the collision position according to current or voltage signals output by each collision sensor, warns through the instrument and takes protection measures for the vehicle through the power system controller and the brake system controller by combining the vehicle speed, the gear information, the accelerator pedal opening and the brake pedal opening, the collision position, the vehicle running state and the driving intention are considered when the vehicle protection measures are formulated, and accurate protection can be realized, the risk of causing a malignant traffic accident after collision is reduced.)

1. A vehicle after-collision protection system is characterized by mainly comprising a plurality of collision sensors, a controller, an accelerator pedal position sensor, a brake pedal position sensor, a vehicle speed sensor, a gear sensor, an instrument, a brake system controller and a power system controller, wherein the collision sensors are respectively arranged on the front side, the rear side, the left side and the right side of a vehicle body;

after the collision happens, the controller identifies the collision position according to current or voltage signals output by each collision sensor, and takes protective measures for the vehicle through an instrument, a power system controller and a brake system controller by combining the vehicle speed, gear information, the opening degree of an accelerator pedal and the opening degree of a brake pedal.

2. The vehicle post-crash protection system of claim 1, wherein the accelerator pedal position sensor is adapted to be mounted below an accelerator pedal, the brake pedal sensor is adapted to be mounted below a brake pedal, the gear sensor is adapted to be mounted below an instrument in the vehicle, and the vehicle speed sensor is adapted to be mounted on a wheel suspension.

3. A vehicle post-collision protection method based on the vehicle post-collision protection system according to claim 1, characterized by comprising the steps of:

s1: the controller continuously monitors the current or voltage value output by each collision sensor, and when the output current or voltage of one or more collision sensors continuously exceeds a collision threshold value under the condition that the duration time exceeds a collision duration time threshold value, the controller judges that collision occurs and judges the collision position;

s2: the controller discerns the collision and takes place the back, and protection control arbitration after colliding according to collision position, speed of a motor vehicle and fender position information takes the protection action then, the protection action is from low to high to be set for from I to IV level altogether, I level protection action: the controller warns through the instrument; II-level protection measures: the controller warns and controls the power system controller to cut off the driving force through the instrument; level III protective measures: the controller warns and controls the power system controller to cut off the driving force and control the brake system controller to perform low-intensity braking through the instrument; and IV-level protection measures: the controller warns and controls the power system controller to cut off the driving force and control the brake system controller to brake at high intensity through the instrument; the braking speed of the high-intensity brake is greater than that of the low-intensity brake;

specifically, the post-collision protection control arbitration is based on:

1) when the vehicle runs in the D gear, the controller takes IV-level protection measures at the highest,

2) when the vehicle runs in the D gear, the controller takes III-level protection measures at the highest,

3) when the vehicle runs in the R gear, forward collision occurs, the controller adopts III-level protection measures at the highest,

4) when the vehicle runs in the R gear and has backward collision, the controller adopts the highest IV-level protection measure,

5) when the vehicle runs in the D gear or the R gear, the vehicle is collided in the left direction or the right direction, the controller adopts IV-level protection measures at the highest,

when the vehicle is collided in different directions, the highest-level protection measures in all the protection measures are taken by the controller according to the collision in all directions to protect the vehicle;

s3: the controller continuously monitors accelerator pedal opening and brake pedal opening and formulates protection measures according to accelerator pedal opening, brake pedal opening and current protection measures, and is specific:

1) when a driver steps on a brake pedal when collision happens, the controller takes II-level protection measures at the highest level;

2) when the controller takes III-level or IV-level protection measures after the collision happens, the brake pedal is stepped by the driver, and the requested braking intensity is greater than the braking intensity of the protection measures taken by the controller, the controller changes the protection measures into II-level;

3) when a collision occurs and the controller adopts II-level, III-level or IV-level control measures, the brake pedal is released after being stepped by a driver, and then when the accelerator is stepped, the controller changes the protection measures into I-level;

s4: and the controller latches the state of the protection measure after the protection measure is implemented until the system is powered off.

4. A method for protecting a vehicle after a collision as claimed in claim 3, wherein a step S0 is further provided before the step S1, specifically:

s0: when the system is powered on, whether the collision sensor is broken or short-circuited is self-checked within a fixed time: when the output current value or the voltage value of the collision sensor continuously exceeds a certain time and is continuously lower than the short-circuit threshold value or higher than the open-circuit threshold value, the controller judges that the collision sensor fails, and the controller prompts a driver to stop running the next step at the same time through an instrument; and if the collision sensor fails to be detected by self after the system is powered on, the next step is carried out.

5. The vehicle post-collision protection method according to claim 3 or 4, wherein in the step S1, the collision duration threshold value is longer as the vehicle speed is lower.

6. A method of protecting a vehicle after a collision as claimed in claim 5, wherein the relationship between the speed of the vehicle and the collision duration threshold is: 1) when the vehicle speed is more than or equal to 0 and less than or equal to 5km/h, the collision duration threshold value is 100 ms; 2) when the vehicle speed is more than 5km/h and less than or equal to 20km/h, the collision duration threshold value is 50 ms; 3) the vehicle speed is more than 20km/h and less than or equal to 50km/h, and the collision duration threshold value is 30 ms; 4) the vehicle speed is more than 50km/h, and the collision duration threshold value is 20 ms.

Technical Field

The invention relates to the technical field of vehicle passive safety control, in particular to a vehicle post-collision protection system and a vehicle post-collision protection method.

Background

In order to carry out safety protection on personnel and vehicles in the vehicles after the vehicles collide, a vehicle collision protection system is arranged on a plurality of vehicles, the current vehicle collision protection system generally comprises a collision sensor, mainly converts a collision signal generated when the vehicles collide into a current value or a voltage value, determines that the vehicles collide when the current value or the voltage value exceeds a set threshold value, and then adopts a mode of cutting off power and braking to protect the vehicles; more advanced control systems can judge the collision strength based on the change condition of the current value or the voltage value output by the collision sensor within a period of time after the collision occurs, so that the vehicle braking is controlled more accurately, and the effectiveness of the system in protecting the vehicle after the collision is improved. However, the two methods only identify whether the vehicle collides or not in isolation, directly control the vehicle to cut off power and brake after the collision occurs, and do not consider the influence of the collision occurrence position, the control intention of the driver and the motion state of the vehicle on the safety of the vehicle.

Disclosure of Invention

The invention aims to provide a vehicle post-collision protection system which can protect a vehicle after collision and reduce the risk of malignant traffic accidents by combining the motion state of the vehicle and the intention of a driver;

the invention also aims to provide a vehicle post-collision protection method which can combine the motion state of a vehicle and the intention of a driver to perform post-collision protection on the vehicle and reduce the risk of malignant traffic accidents.

The invention provides a vehicle collision protection system, which adopts the following technical scheme: a vehicle collision rear protection system mainly comprises a plurality of collision sensors, a controller, an accelerator pedal position sensor, a brake pedal position sensor, a vehicle speed sensor, a gear sensor, an instrument, a brake system controller and a power system controller, wherein the collision sensors are respectively arranged on the front side, the rear side, the left side and the right side of a vehicle body;

after the collision happens, the controller identifies the collision position according to current or voltage signals output by each collision sensor, and takes protective measures for the vehicle through an instrument, a power system controller and a brake system controller by combining the vehicle speed, gear information, the opening degree of an accelerator pedal and the opening degree of a brake pedal.

Has the advantages that: according to the vehicle collision protection system, collision sensors are arranged on the front side, the rear side, the left side and the right side of a vehicle, a vehicle speed sensor and a gear sensor can respectively collect vehicle running information such as vehicle speed and gear information and transmit the vehicle running information to a controller, an accelerator pedal position sensor and a gear pedal position sensor can detect the driving intention of a driver, after collision occurs, the controller recognizes the collision position through each collision sensor, warns the driver through an instrument, and takes protection measures on the vehicle through a power system controller and a braking system controller by combining the vehicle running information and the driving intention of the driver; in conclusion, the vehicle collision post-protection system can intelligently identify the collision position of the vehicle after the vehicle is collided, and implement different protection measures according to the driving intention of a driver and the motion state of the vehicle, so that accurate protection can be realized, and the risk of causing a malignant traffic accident after collision can be reduced.

Furthermore, an accelerator pedal position sensor is used for being installed below an accelerator pedal, a brake pedal sensor is used for being installed below a brake pedal, a gear sensor is used for being installed below an instrument in the vehicle, and a vehicle speed sensor is used for being installed on a wheel suspension.

Has the advantages that: the position of each detection element is reasonably arranged, and accurate measurement of the vehicle running state information and the intention of a driver is facilitated.

The technical scheme of the vehicle collision protection method is as follows: a method of post-collision protection for a vehicle, comprising the steps of:

s1: the controller continuously monitors the current or voltage value output by each collision sensor, and when the output current or voltage of one or more collision sensors continuously exceeds a collision threshold value under the condition that the duration time exceeds a collision duration time threshold value, the controller judges that collision occurs and judges the collision position;

s2: the controller discerns the collision and takes place the back, and protection control arbitration after colliding according to collision position, speed of a motor vehicle and fender position information takes the protection action then, the protection action is from low to high to be set for from I to IV level altogether, I level protection action: the controller warns through the instrument; II-level protection measures: the controller warns and controls the power system controller to cut off the driving force through the instrument; level III protective measures: the controller warns and controls the power system controller to cut off the driving force and control the brake system controller to perform low-intensity braking through the instrument; and IV-level protection measures: the controller warns and controls the power system controller to cut off the driving force and control the brake system controller to brake at high intensity through the instrument; the braking speed of the high-intensity brake is greater than that of the low-intensity brake;

specifically, the post-collision protection control arbitration is based on:

1) when the vehicle runs in the D gear, the controller takes IV-level protection measures at the highest,

2) when the vehicle runs in the D gear, the controller takes III-level protection measures at the highest,

3) when the vehicle runs in the R gear, forward collision occurs, the controller adopts III-level protection measures at the highest,

4) when the vehicle runs in the R gear and has backward collision, the controller adopts the highest IV-level protection measure,

5) when the vehicle runs in the D gear or the R gear, the vehicle is collided in the left direction or the right direction, the controller adopts IV-level protection measures at the highest,

when the vehicle is collided in different directions, the highest-level protection measures in all the protection measures are taken by the controller according to the collision in all directions to protect the vehicle;

s3: the controller continuously monitors accelerator pedal opening and brake pedal opening and formulates protection measures according to accelerator pedal opening, brake pedal opening and current protection measures, and is specific:

1) when a driver steps on a brake pedal when collision happens, the controller takes II-level protection measures at the highest level;

2) when the controller takes III-level or IV-level protection measures after the collision happens, the brake pedal is stepped by the driver, and the requested braking strength is greater than the braking strength of the protection measures taken by the controller, the controller changes the protection measures into II-level.

3) When the collision happens, the controller takes II-level, III-level or IV-level control measures, the brake pedal is released after being stepped by the driver, and then when the accelerator is stepped, the controller changes the protection measures into I-level.

S4: and the controller latches the state of the protection measure after the protection measure is implemented until the system is powered off.

Has the advantages that: the invention relates to a vehicle post-collision protection method, wherein a controller identifies collision occurrence and judges a collision position through a current value/voltage value transmitted by a collision sensor, after the collision occurs, the controller carries out post-collision protection control arbitration according to the collision position, vehicle speed and gear information, one of four protective measures I to IV is selected to protect a vehicle in a targeted manner, meanwhile, the controller monitors the intention of a driver through a brake pedal position sensor and an accelerator pedal position sensor, and determines to change or maintain the protective measures according to manual intervention conditions, in conclusion, the vehicle post-collision protection method has reasonable steps and compact logic, skillfully considers the vehicle operation condition and the intention of a human driver when the protective measures are appointed, and needs to be maintained or changed according to manual intervention if the intention of the human driver is violated after the protective measures take effect, and four protection measures with different emergency degrees from low to high are appointed from I to IV, so that the protection effect is more accurate, the pertinence is stronger, and the risk of causing malignant traffic accidents after collision can be reduced.

Further, before the step of S1, a step of S0 is provided, specifically:

s0: when the system is powered on, whether the collision sensor is broken or short-circuited is self-checked within a fixed time: when the output current value or the voltage value of the collision sensor continuously exceeds a certain time and is continuously lower than the short-circuit threshold value or higher than the open-circuit threshold value, the controller judges that the collision sensor fails, and the controller prompts a driver to stop running the next step at the same time through an instrument; and if the collision sensor fails to be detected by self after the system is powered on, the next step is carried out.

Has the advantages that: in the step S0, the effectiveness of the collision sensor can be checked before the controller recognizes the occurrence of the collision, so as to prevent control judgment errors caused by failure of the collision sensor and improve the judgment accuracy; on the other hand, the collision sensor can be reminded of failure in time, so that the normal operation of the protection system after the vehicle is collided is found, and the maintenance is facilitated.

Further, in step S1, the collision duration threshold value is longer as the vehicle speed is lower.

Has the advantages that: and corresponding collision duration time thresholds are appointed according to different vehicle speeds, so that the situation that the normal running is interfered by the external mistaken collision activation protection measures when the vehicle is static or runs at a low speed can be avoided.

Further, the corresponding relationship between the vehicle speed and the collision duration threshold is as follows: 1) when the vehicle speed is more than or equal to 0 and less than or equal to 5km/h, the collision duration threshold value is 100 ms; 2) when the vehicle speed is more than 5km/h and less than or equal to 20km/h, the collision duration threshold value is 50 ms; 3) the vehicle speed is more than 20km/h and less than or equal to 50km/h, and the collision duration threshold value is 30 ms; 4) the vehicle speed is more than 50km/h, and the collision duration threshold value is 20 ms.

Has the advantages that: and a corresponding reasonable collision duration threshold is appointed according to different vehicle speeds, so that the external mistaken collision can be avoided to activate a protection measure when the vehicle is static or runs at a low speed, and the normal running is interfered.

Drawings

FIG. 1 is a system schematic block diagram of an embodiment 1 of a vehicle post-crash protection system of the present invention;

fig. 2 is a control flowchart of an embodiment 1 of a vehicle post-collision protection system of the present invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

Embodiment 1 of a vehicle post-collision protection system of the present invention:

as shown in fig. 1-2, the vehicle collision protection system of the present invention is mainly composed of a controller, a collision sensor, an accelerator pedal position sensor, a brake pedal position sensor, a vehicle speed sensor, a gear sensor, an instrument, a brake system controller, and a power system controller, wherein the collision sensor is an electronic collision sensor or a pressure-sensitive sensor, and can convert a pressure signal applied to the surface of the sensor into a current/voltage signal. Collision sensor is equipped with a plurality ofly, including preceding collision sensor, backward collision sensor, left side collision sensor, right side collision sensor, and is corresponding, and preceding collision sensor, backward collision sensor, left side collision sensor, right side collision sensor are located the front, back, left and right sides of vehicle automobile body respectively and are connected with the controller electricity, through sending electric current/voltage value for controller discernment collision signal and collision position to the controller.

The vehicle speed sensor, the gear sensor, the accelerator pedal position sensor and the brake pedal position sensor are electrically connected with the controller and are used for respectively transmitting the current vehicle speed, gear information, accelerator pedal opening and brake pedal opening of the vehicle to the controller. The vehicle speed sensor is a magnetoelectric vehicle speed sensor or a Hall vehicle speed sensor, is arranged on a wheel suspension and is used for identifying a wheel speed signal when a wheel rotates. The gear sensor is also called a gear switch sensor, is usually installed below an instrument panel of a central control console in a vehicle and is used for detecting gear signals, a plurality of contacts are arranged on the gear sensor, when the vehicle shifts gears, the contacts move to positions corresponding to the gears, the output voltage value changes, and the controller can identify gear information through the voltage signals. The accelerator pedal position sensor is a Hall sensor or a resistance type sensor and is arranged below an accelerator pedal, and the accelerator pedal position sensor outputs a corresponding voltage signal when the accelerator pedal is stepped on. The brake pedal position sensor is a Hall sensor or a resistance type sensor and is arranged below the brake pedal, and the brake pedal position sensor outputs a corresponding voltage signal when the brake pedal is stepped on.

The controller can adopt a Shecaire MC9S12G128 type single chip microcomputer, is electrically connected with the brake system controller, the power system controller and the instrument, and can warn through the instrument, control the power system controller to cut off the driving force of the vehicle and control the brake system controller to brake the vehicle. The brake system controller comprises an EBS controller in an EBS brake system and a motor controller in an electric feedback brake system, the vehicle is generally provided with the EBS brake system and the electric feedback brake system, the EBS brake system is a traditional mechanical brake system and comprises the EBS controller for acquiring brake signals, and the EBS controller can brake the vehicle by controlling the mechanical brake of the vehicle; the electric feedback braking system comprises a motor controller, and the motor (permanent magnet synchronous motor) is controlled by the motor controller to generate electricity to realize vehicle braking. When the vehicle needs to be braked, a brake command is sent to the brake controller, namely an electric feedback brake command is sent to the motor controller and a mechanical brake command is sent to the EBS controller at the same time, so that the aim of braking the vehicle is fulfilled. The power system controller comprises a driving motor controller or an engine controller and a gearbox controller, for a vehicle, the power system is generally an electric machine or a traditional engine, the electric machine power system comprises a driving motor, the traditional engine power system mainly comprises an engine and a gearbox, when the vehicle is actually driven, the engine controller identifies power requirements according to the action of a driver operating an accelerator pedal, coordinates an engine air inlet system and an oil supply system to convert heat energy generated by fuel oil combustion into mechanical energy, and the gearbox controller selects a proper gear based on the current vehicle load and the vehicle speed and transmits the output mechanical energy to a vehicle driving wheel; the driving motor controller identifies the power demand according to the action of the driver operating the accelerator pedal, and then converts the electric energy into mechanical energy to be transmitted to the driving wheels of the vehicle.

Based on the above vehicle post-collision protection system, the present invention provides a vehicle post-collision protection method, but the method is not limited to the vehicle post-collision protection system described above:

s0 (collision sensor self-test): when the system is powered on, whether the collision sensor is broken or short-circuited is self-checked within a fixed time (2S): when the output current value or the voltage value of the collision sensor continuously exceeds a certain time (500 ms) and is lower than a short-circuit threshold or higher than a broken-circuit threshold, the controller judges that the collision sensor fails, and the controller prompts a driver of system faults through an instrument and does not perform the next step; and if the collision sensor fails to be detected by self after the system is powered on, the next step is carried out.

S1 (vehicle crash event recognition): the controller continuously monitors the current or voltage value output by each collision sensor, and when the output current or voltage of one or more collision sensors continuously exceeds a collision threshold value under the condition that the duration time exceeds a collision duration time threshold value, the controller judges that collision occurs and judges the collision position; wherein the lower the vehicle speed the longer the collision duration threshold: 1) when the vehicle speed is more than or equal to 0 and less than or equal to 5km/h, the collision duration threshold value is 100 ms; 2) when the vehicle speed is more than 5km/h and less than or equal to 20km/h, the collision duration threshold value is 50 ms; 3) the vehicle speed is more than 20km/h and less than or equal to 50km/h, and the collision duration threshold value is 30 ms; 4) the vehicle speed is more than 50km/h, and the collision duration threshold value is 20 ms.

S2 (post-collision protection control arbitration): the controller discerns the collision and takes place the back, and protection control arbitration after colliding according to collision position, speed of a motor vehicle and fender position information takes the protection action then, the protection action is from low to high to be set for from I to IV level altogether, I level protection action: the controller warns collision through the instrument; II-level protection measures: the controller carries out collision warning through the instrument and controls the power system controller to cut off the driving force; level III protective measures: the controller warns collision through the instrument, controls the power system controller to cut off driving force and controls the brake system controller to brake at low intensity; and IV-level protection measures: the controller warns collision through the instrument, controls the power system controller to cut off driving force and controls the brake system controller to brake at high strength; the braking speed of the high-intensity brake is greater than that of the low-intensity brake;

specifically, the post-collision protection control arbitration is based on:

1) when the vehicle runs in the D gear, the controller takes IV-level protection measures at the highest,

2) when the vehicle runs in the D gear, the controller takes III-level protection measures at the highest,

3) when the vehicle runs in the R gear, forward collision occurs, the controller adopts III-level protection measures at the highest,

4) when the vehicle runs in the R gear and has backward collision, the controller adopts the highest IV-level protection measure,

5) when the vehicle runs in the D gear or the R gear, the vehicle is collided in the left direction or the right direction, the controller adopts IV-level protection measures at the highest,

when the vehicle is collided in different directions, the highest-level protection measures in all the protection measures are taken by the controller according to the collision in all directions to protect the vehicle;

s3 (manual intervention): the controller continuously monitors accelerator pedal opening and brake pedal opening and formulates protection measures according to accelerator pedal opening, brake pedal opening and current protection measures, and is specific:

1) when a driver steps on a brake pedal when collision happens, the controller takes II-level protection measures at the highest level;

2) when the controller takes III-level or IV-level protection measures after the collision happens, the brake pedal is stepped by the driver, and the requested braking strength is greater than the braking strength of the protection measures taken by the controller, the controller changes the protection measures into II-level.

3) When the collision happens, the controller takes II-level, III-level or IV-level control measures, the brake pedal is released after being stepped on by a driver, and then when the accelerator is stepped on, the controller changes the protection measures into I-level.

S4: and the controller latches the state of the protection measure after the protection measure is implemented until the system is powered off.

In summary, when the invention is used, the controller identifies the collision position according to the current or voltage signal output by each collision sensor, then identifies the vehicle collision event by combining the vehicle running state information (gear information and vehicle speed), arbitrates and formulates the protection measure through the protection control after collision, corrects the protection measure by considering the intention of the driver (the opening degree of an accelerator pedal and the opening degree of a brake pedal), and finally keeps the protection measure until the vehicle speed is 0.

In the S1, the threshold value of the collision duration time threshold value in the collision recognition process is a dynamic change value, the lower the vehicle speed is, the longer the collision duration time threshold value is, the more comprehensive consideration is given, and the situation that the normal driving is interfered by the activation of the protection measures through the outside mistakenly collision when the vehicle is static or runs at a low speed can be avoided.

The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.