CN113602262B - Vehicle collision protection system and method - Google Patents
Vehicle collision protection system and method Download PDFInfo
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- CN113602262B CN113602262B CN202111126740.6A CN202111126740A CN113602262B CN 113602262 B CN113602262 B CN 113602262B CN 202111126740 A CN202111126740 A CN 202111126740A CN 113602262 B CN113602262 B CN 113602262B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/08—Active safety systems predicting or avoiding probable or impending collision or attempting to minimise its consequences
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/18—Conjoint control of vehicle sub-units of different type or different function including control of braking systems
- B60W10/184—Conjoint control of vehicle sub-units of different type or different function including control of braking systems with wheel brakes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/08—Interaction between the driver and the control system
- B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/08—Active safety systems predicting or avoiding probable or impending collision or attempting to minimise its consequences
- B60W2030/082—Vehicle operation after collision
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/08—Interaction between the driver and the control system
- B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
- B60W2050/143—Alarm means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/10—Longitudinal speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2540/00—Input parameters relating to occupants
- B60W2540/10—Accelerator pedal position
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2540/00—Input parameters relating to occupants
- B60W2540/12—Brake pedal position
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2540/00—Input parameters relating to occupants
- B60W2540/16—Ratio selector position
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- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
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- Combustion & Propulsion (AREA)
- Human Computer Interaction (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention relates to a vehicle post-collision protection system and a method, wherein the vehicle post-collision 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, 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.
Description
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 collision occurs, 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 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 in-vehicle instrument, 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-crash vehicle protection 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 the back protection control arbitration of 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 totally from I to IV level, 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 controls the brake system controller to brake at high strength 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 a D gear, the vehicle is collided backwards, the controller adopts III-level protection measures at the highest level,
3) When the vehicle runs in the R gear, the controller takes III-level protection measures at the highest level,
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 measure in all the protection measures is taken according to the collision in all directions by the controller to protect the vehicle;
s3: the controller continuously monitors the opening degree of the accelerator pedal and the opening degree of the brake pedal and formulates a protection measure according to the opening degree of the accelerator pedal, the opening degree of the brake pedal and the current protection measure, and the controller 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 beneficial effects that: the invention relates to a vehicle post-collision protection method, which is characterized in that 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, the vehicle speed and gear information, one of four levels of protection measures I to IV is pertinently selected to protect a vehicle, meanwhile, the controller monitors the intention of a driver through a brake pedal position sensor and an accelerator pedal position sensor, and decides to change or maintain the protection measures according to manual intervention conditions.
Further, before the step S1, a step S0 is further provided, specifically:
s0: when the system is powered on, whether the collision sensor is in open circuit or short circuit is self-detected 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 prompts a driver to stop running the next step 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 beneficial effects that: in the S0 step, the effectiveness of the collision sensor can be checked before the controller identifies the occurrence of collision, so that control judgment errors caused by the failure of the collision sensor are prevented, and the judgment accuracy is improved; 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: corresponding collision duration time thresholds are appointed according to different vehicle speeds, so that the situation that the vehicle is static or runs at a low speed and the normal running is interfered by activating protection measures by external mistakenly collision 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 100ms; 2) When the vehicle speed is more than 5km/h and less than or equal to 20km/h, the collision duration threshold value is 50ms; 3) The vehicle speed is more than 20km/h and less than or equal to 50km/h, and the collision duration threshold value is 30ms; 4) The vehicle speed is more than 50km/h, and the collision duration threshold value is 20ms.
Has the advantages that: corresponding reasonable collision duration threshold values are appointed according to different vehicle speeds, and therefore the situation that when the vehicle is static or runs at a low speed, the external mistaken collision activates protection measures can be avoided, and 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 is described in detail below with reference to the attached 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 installed on a wheel suspension and is used for identifying a wheel speed signal when a wheel rotates. The gear sensor is usually installed below an instrument panel of a central control console in a vehicle and used for detecting gear signals, a plurality of contacts are arranged on the gear sensor, the contacts move to positions corresponding to the gear positions when the vehicle shifts gears, the output voltage value changes, and the controller can recognize 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.
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:
s0 (collision sensor self-test): when the system is powered on, whether the collision sensor is in open circuit or short circuit is self-detected 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 identification): 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 100ms; 2) When the vehicle speed is more than 5km/h and less than or equal to 20km/h, the collision duration threshold value is 50ms; 3) The vehicle speed is more than 20km/h and less than or equal to 50km/h, and the collision duration threshold value is 30ms; 4) The vehicle speed is more than 50km/h, and the collision duration threshold value is 20ms.
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 protection measures: the controller warns collision through the instrument, controls the power system controller to cut off the 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 the driving force and controls the braking 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 a D gear, forward collision occurs, the controller adopts 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, the controller takes III-level protection measures at the highest level,
4) When the vehicle runs in the R gear, the controller takes IV-level protection measures at most,
5) When the vehicle runs in a D gear or an R gear, the vehicle is collided in the left direction or the right direction, the controller adopts IV-level protection measures at most,
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 the opening degree of the accelerator pedal and the opening degree of the brake pedal and formulates a protection measure according to the opening degree of the accelerator pedal, the opening degree of the brake pedal and the current protection measure, and the controller 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 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 condition that the normal running is interfered by activating a protection measure by mistake 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.
Claims (4)
1. A method of protecting a vehicle post-crash protection system, 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 the back protection control arbitration of 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 totally from I to IV level, 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 protection measures: the controller warns and controls the power system controller to cut off the driving force and controls the brake system controller to brake at low intensity 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, the controller takes III-level protection measures at the highest level,
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 adopts III-grade or IV-grade protection measures after collision happens, the brake pedal is stepped down by a driver, and the required brake strength is greater than that of the protection measures adopted by the controller, the controller changes the protection measures into II-grade;
3) When a collision happens and 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: the controller latches the state of the protection measure after the protection measure is implemented until the system is powered off;
the vehicle after-collision 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 collision occurs, 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; the accelerator pedal position sensor is used for being installed below an accelerator pedal, the brake pedal sensor is used for being installed below a brake pedal, the gear sensor is used for being installed below an instrument in a vehicle, and the vehicle speed sensor is used for being installed on a wheel suspension.
2. A method of protecting a vehicle post-collision protection system as claimed in claim 1, 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.
3. A protection method of a vehicle post-collision protection system according to claim 1 or 2, wherein in the step S1, the collision duration threshold value is longer as the vehicle speed is lower.
4. A method of protecting a vehicle post-crash protection system as claimed in claim 3, wherein the correspondence between vehicle speed and crash 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 100ms; 2) When the vehicle speed is more than 5km/h and less than or equal to 20km/h, the collision duration threshold value is 50ms; 3) The vehicle speed is more than 20km/h and less than or equal to 50km/h, and the collision duration threshold value is 30ms; 4) The vehicle speed is more than 50km/h, and the collision duration threshold value is 20ms.
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| CN2021109096813 | 2021-08-09 | ||
| CN202110909681.3A CN113415272A (en) | 2021-08-09 | 2021-08-09 | Vehicle collision protection system and method |
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| CN113602262A (en) | 2021-11-05 |
| CN113415272A (en) | 2021-09-21 |
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