CN115416603A - Automobile pre-collision device capable of actively controlling crushing deformation of energy absorption box and control method - Google Patents
Automobile pre-collision device capable of actively controlling crushing deformation of energy absorption box and control method Download PDFInfo
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- CN115416603A CN115416603A CN202211226595.3A CN202211226595A CN115416603A CN 115416603 A CN115416603 A CN 115416603A CN 202211226595 A CN202211226595 A CN 202211226595A CN 115416603 A CN115416603 A CN 115416603A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/24—Arrangements for mounting bumpers on vehicles
- B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
- B60R19/34—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means destroyed upon impact, e.g. one-shot type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/24—Arrangements for mounting bumpers on vehicles
- B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
- B60R2019/262—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means with means to adjust or regulate the amount of energy to be absorbed
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Abstract
The invention relates to an automobile pre-collision device capable of actively controlling crushing deformation of an energy absorption box and a control method, wherein the control method comprises the following steps: the system comprises a vehicle-mounted CAN network, a collision pre-judging unit, a target motion state checking unit, a target type identifying unit, an energy absorption box on a vehicle body, an energy absorption box controller and an energy absorption box control mechanism, wherein the energy absorption box is arranged on an automobile bumper system and is used for playing a role in buffering; the energy-absorbing box is by the cylindrical supporter that the metal thin wall constitutes, and energy-absorbing box control mechanism installs on the energy-absorbing box, and energy-absorbing box control mechanism includes: the actuator is composed of an electromagnet wound with a coil, and the electromagnet is vertical to the axis direction of the energy absorption box; the invention has the advantages that: and selecting corresponding deformation modes of the energy absorption boxes to adjust the collision contact force and the energy absorption characteristics according to different collision speeds and collision objects.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to an automobile pre-collision device capable of actively controlling a crushing deformation mode of an energy absorption box and a control method.
Background
With the rapid rise of automobile reserves in China, the road traffic environment is increasingly crowded, and traffic accidents are increasingly frequent. Meanwhile, the national regulations for energy conservation and emission reduction of automobiles are increasingly strict, so that the light-weight design requirement of the whole automobile is sharply increased. The collision energy absorption performance of the automobile anti-collision beam and the contradiction between the protection capability of the rear part of the anti-collision beam and the lightweight design need to be solved urgently. And current anticollision roof beam is generally for welding steel sheet or aluminium alloy, and its rigidity and energy-absorbing characteristic can't be according to operating mode automatically regulated, when striking the pedestrian, cause serious injury to the pedestrian easily.
For predicting the possibility of vehicle collision, a perfect control method has been formed for controlling the autonomous braking of the vehicle, for example, chinese patent CN 104691480A discloses a vehicle pre-collision control system, which is provided with a collision prediction unit, and can effectively reduce the possibility of vehicle collision. Even if an unavoidable collision occurs, the collision speed can be reduced by means of autonomous braking, so that the safety of passengers in the vehicle is reduced to the maximum extent. The system can not distinguish, identify and selectively protect the collided target. Chinese patent CN 105150972A discloses a variable stiffness bumper system based on pre-crash, which can adjust the stiffness of an airbag by controlling the inflation amount of the airbag, thereby flexibly adjusting the energy absorption characteristic of the bumper according to the different crash properties. The system disclosed in this patent is complex in structure, requires additional air supply and control valves, and is not easy to arrange. Chinese patent CN 107719285A discloses a pre-collision system based on an active protection device of shape memory alloy, which can sense the type of an obstacle, and when the type of the obstacle is a pedestrian, heat the memory metal energy absorption box to make it have weaker rigidity. However, the system adopts an electric heating method to change the structural rigidity, the response speed is relatively slow, and the traditional anti-collision beam with a certain movement speed can still cause great damage to pedestrians if the rigidity cannot be reduced.
Therefore, the invention provides the anti-collision beam which can actively judge whether the vehicle is in inevitable collision or not, can judge the type of the obstacle, and actively adjusts the rigidity of the collision position according to different types, collision speeds and collision positions of the obstacle.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an automobile pre-crash device and a control method capable of actively controlling crush deformation of an energy absorption box, which are used to solve the contradiction between the impact energy absorption characteristics and the mass of an anti-crash beam in the context of light weight of an automobile, and simultaneously solve the functional deficiency that the existing anti-crash beam cannot execute different protection strategies for different crashed objects.
The invention provides an automobile pre-collision device capable of actively controlling crushing deformation of an energy absorption box, which comprises: the system comprises a vehicle-mounted CAN network, a collision pre-judging unit, a target motion state checking unit and a target type identifying unit, wherein the vehicle-mounted CAN network is used for obtaining and transmitting the traffic information of the vehicle; the collision pre-judging unit is used for receiving the traffic information of the vehicle transmitted by the vehicle-mounted CAN network, receiving the relative traffic information between the obstacle and the vehicle transmitted by the target motion state checking unit, and judging whether the collision between the vehicle and the obstacle CAN not be avoided; the target motion state checking unit is used for detecting and transmitting relative traffic information of the barrier and the vehicle; the target type identification unit is used for identifying the type of a target obstacle; the improved automobile bumper system comprises an energy absorption box, an energy absorption box controller and an energy absorption box control mechanism, wherein the energy absorption box, the energy absorption box controller and the energy absorption box control mechanism are arranged on an automobile body; the energy-absorbing box is by the cylindrical supporter that the metal thin wall constitutes, energy-absorbing box control mechanism installs on the energy-absorbing box, energy-absorbing box control mechanism includes: actor and actor power supply, the actor comprises an electro-magnet that the winding has the coil, and this electro-magnet is perpendicular with the axle center direction of energy-absorbing box, and eight are listed as four group actors altogether and distribute in the symmetric position of energy-absorbing box pipe wall, and every row of actor that the equipartition set up is vertical links firmly on the pipe wall, actor power supply is used for supplying power for the actor, the energy-absorbing box controller passes through actor power supply control actor action, the energy-absorbing box controller includes the folding conquassation mode of quadrangle of energy-absorbing box, the folding conquassation mode of octagon and the anti conquassation mode of conquassation, and wherein the folding conquassation mode of quadrangle does: the energy absorption box controller controls two groups of actuators which are arranged in a quadrilateral way, wherein one group of two symmetrical actuators attract each other, the other group of two symmetrical actuators repel each other, and the magnetic force directions of the two groups of actuators in two adjacent rows are opposite; the octagonal folding crushing mode is as follows: the energy absorption box controller controls four groups of actuators which are arranged in an octagonal shape, wherein two groups of four actuators which are in a quadrilateral shape attract each other, the other two groups of four actuators which are in a quadrilateral shape repel each other, and the magnetic force directions of the four groups of actuators in two adjacent rows are opposite; the folding and crushing resistant mode is that the energy absorption box controller controls four groups of actuators which are arranged in an octagonal shape, wherein the eight actuators in the octagonal shape in the four groups attract each other, and the magnetic force directions of the four groups of actuators in two adjacent rows are the same.
As a preferred structure of the invention, eight rows of vertically arranged actuators are uniformly distributed on the circumference of the energy absorption box and are vertically arranged in a staggered manner.
The invention also aims to provide a control method of the automobile pre-collision device capable of actively controlling the crushing deformation of the energy absorption box, which comprises the following steps:
step S1: the method comprises the steps that the speed and the acceleration of a vehicle are obtained through a vehicle-mounted CAN network, whether collision CAN not be avoided or not is judged by combining detection of a target motion direction and the speed by a target motion state checking unit, and when the possibility of collision is judged, the type of a target to be collided is judged by a target type identification unit;
step S2: when the collision target type judging unit judges that an object needs to be protected, the energy absorption box controller sends an instruction and enters an octagonal folding and crushing mode, the octagonal folding and crushing mode enables the energy absorption box to carry out octagonal folding and crushing through the control actuator, and collision peak force is reduced, so that overhigh damage of the collided object caused by overhigh instantaneous collision contact force is reduced;
and step S3: when the collision target type judging unit judges that the vehicle type is the same, the energy absorption box controller sends an instruction and enters a quadrilateral folding crushing mode, the quadrilateral folding crushing mode enables the energy absorption box to carry out quadrilateral folding crushing by controlling the actuator, and the energy absorption box can have relatively high collision contact force and energy absorption effect;
and step S4: when the collision target type is judged to be a wall body, a large commercial vehicle and an object with larger rigidity, the energy absorption box controller sends an instruction and enters an anti-folding crushing mode, the anti-folding crushing mode enables the energy absorption box to carry out anti-folding crushing through controlling the actuator, and when the rigidity of the energy absorption box structure is larger, the energy absorption box is not easy to crush, so that parts behind the anti-collision beam can be well protected, and a larger living space is provided for passengers.
In a preferred aspect of the present invention, in step S2, the octagonal folding collapse mode actuator is controlled as follows: step S21: the energy absorption box controller controls four groups of actuators which are arranged in an octagonal shape, wherein two groups of four actuators which are in a quadrilateral shape attract each other, the other two groups of four actuators which are in a quadrilateral shape repel each other, and the directions of magnetic forces of the four groups of actuators in two adjacent rows are opposite.
In a preferred aspect of the present invention, in step S3, the quadrangular folding collapse mode control actuator is configured as follows: step S31: the energy absorption box controller controls two groups of actuators which are arranged in a quadrilateral mode, wherein one group of two symmetrical actuators attract each other, the other group of two symmetrical actuators repel each other, and the magnetic force directions of the two groups of actuators in two adjacent rows are opposite.
In step S4, the operation device is preferably controlled in the anti-collapse mode in the following manner: step S41: the energy absorption box controller controls four groups of actuators which are arranged in an octagonal shape, wherein eight actuators in the octagonal shape of the four groups attract each other, and the magnetic force directions of the four groups of actuators in two adjacent rows are the same.
The invention has the advantages and positive effects that:
1. the invention can actively change the crushing deformation mode of the energy absorption box according to the collision target when the vehicle is in inevitable collision in the running process so as to generate different protection effects. After identifying the potential impact target attribute as an object needing protection, actively reducing the rigidity and the impact peak force to reduce the damage to the impact object needing protection; when the object is identified as a large vehicle, a wall, or the like, the deformation mode having a higher collision-bearing capacity is selected to ensure a sufficient living space for the occupant of the vehicle.
2. The invention has the capability of corresponding to various collision working conditions. The relative speed during collision is estimated by detecting the motion state and type of a potential collision object through a sensor and combining the motion working condition of the vehicle. And selecting a corresponding deformation mode of the energy absorption box to adjust the collision contact force and the energy absorption characteristic aiming at different collision speeds and collision objects.
3. The automobile crash box has the advantages that the left and right crash boxes of the automobile have different rigidity according to the collision working condition, so that the left and right crash boxes can realize different collapse lengths under the same impact action, further, the anti-collision beam can incline to a certain extent in the collision process, the guiding function of collision force is realized, and the loss in the collision process is reduced to the minimum.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a schematic view of an installation structure of an anti-collision beam, an energy absorption box and an energy absorption box control mechanism in the embodiment of the invention.
Fig. 2 is a schematic view of the structure of an electromagnetic coil and an electromagnet in the actuator according to the embodiment of the present invention.
FIG. 3 is a schematic diagram of the relationship between the electrodes of the actuator on the crash box in the embodiment of the present invention.
FIG. 4 is a schematic diagram of the relationship between the applied force and the input voltage of the solenoid in the embodiment of the present invention.
Figure 5 is a schematic diagram of the folding and crushing of an energy absorption box in a quadrilateral folding and crushing mode according to an embodiment of the invention.
FIG. 6 is a top view of a folded crush of an energy absorption cell in a quadrilateral folded crush mode in accordance with an embodiment of the invention.
FIG. 7 is a schematic diagram of the four actuator directions in the quadrilateral folding crushing mode according to the embodiment of the invention.
Figure 8 is a schematic view of the crush of the energy absorption cells in the octagonal folded crush mode in an embodiment of the invention.
Figure 9 is a top plan view of the energy absorption cell folded and crushed in the octagonal folded crushing mode in an embodiment of the invention.
Fig. 10 is a schematic view of eight actuators in the octagonal folding and collapsing mode according to the embodiment of the invention.
FIG. 11 is a schematic view of the crush of the energy absorption cells in a crush mode in an embodiment of the invention.
FIG. 12 is a top view of a folded crush of an energy absorber box in an anti-fold crush mode in an embodiment of the invention.
Fig. 13 is a schematic view of eight actuators in an anti-crushing mode according to an embodiment of the present invention.
FIG. 14 is a graph comparing crash reaction forces for the crash boxes for the three deformation modes of the example of the invention.
FIG. 15 is a control flow diagram in an embodiment of the present invention.
Reference numerals: the energy absorption box comprises an energy absorption box 1, an anti-collision beam 2 and an actuator 3.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.
Example 1
Fig. 1-15 show overall structural schematics according to an embodiment of the present invention.
As shown in fig. 1 to 15, an automotive pre-crash device capable of actively controlling crush deformation of a crash box according to an embodiment of the present invention includes: the system comprises a vehicle-mounted CAN network, a collision pre-judging unit, a target motion state checking unit, a target type identifying unit, an energy absorption box controller and an energy absorption box control mechanism, wherein the vehicle-mounted CAN network is used for acquiring and transmitting the traffic information of the vehicle; the collision pre-judging unit is used for receiving the traffic information of the vehicle transmitted by the vehicle-mounted CAN network, receiving the relative traffic information between the obstacle and the vehicle transmitted by the target motion state checking unit, and judging whether the collision between the vehicle and the obstacle CAN not be avoided; the target motion state checking unit is used for detecting and transmitting relative traffic information of the barrier and the vehicle; the target type identification unit is used for identifying the type of a target obstacle; the energy absorption box 1 is arranged on an anti-collision beam 2 of an automobile bumper system and is used for playing a role in buffering; the energy-absorbing box 1 is by the cylindrical supporter that metal thin wall constitutes, energy-absorbing box control mechanism installs on energy-absorbing box 1, energy-absorbing box control mechanism includes: actor 3 and actor power supply, actor 3 comprises the electro-magnet that a winding has the coil, and this electro-magnet is perpendicular with the axle center direction of energy-absorbing box 1, and eight are listed as four group actors 3 distributions in the symmetric position of energy-absorbing box 1 pipe wall altogether, and eight are listed as actor 3 of vertical setting and are the dislocation arrangement, and every 3 vertical links firmly on the pipe wall of actor that the equipartition set up, actor power supply is used for supplying power for actor 3, the energy-absorbing box controller passes through actor power supply control actor 3 actions, and the control mode of energy-absorbing box controller does, and the solenoid of installing on energy-absorbing box 1 realizes the folding crushing mode of octagon, folding crushing mode and the anti folding crushing mode of energy-absorbing box 1 through the periodic effect of magnetic force on the direction of height, the energy-absorbing box controller includes the folding crushing mode of quadrangle, the folding crushing mode of octagon and the anti folding crushing mode of energy-absorbing box 1, and wherein the folding crushing mode of quadrangle is: the energy absorption box controller controls two groups of actuators 3 which are arranged in a quadrilateral way, wherein one group (two in total) of two symmetrical actuators 3 attract each other, the other group of two symmetrical actuators 3 repel each other, and the magnetic force directions of the two groups of actuators 3 in two adjacent rows are opposite; the octagonal folding and crushing mode is as follows: the energy absorption box controller controls four groups of actuators 3 which are arranged in an octagonal shape, wherein two groups (four in all) of four actuators 3 which are in a quadrilateral shape attract each other, the other two groups of four actuators 3 which are in a quadrilateral shape repel each other, and the directions of magnetic forces of the four groups of actuators 3 in two adjacent rows are opposite; the folding and crushing resistant mode is that the energy absorption box controller controls four groups (eight in total) of actuators 3 which are arranged in an octagonal shape, wherein the eight actuators 3 in the octagonal shape are attracted by the four groups, and the magnetic force directions of the four groups of actuators 3 in two adjacent rows are the same.
Example 2
The embodiment provides a control method of an automobile pre-collision device capable of actively controlling crushing deformation of an energy absorption box, which specifically comprises the following steps:
step S1: the method comprises the steps that the speed and the acceleration of a vehicle are obtained through a vehicle-mounted CAN network, whether collision CAN not be avoided or not is judged by combining detection of a target motion direction and the speed by a target motion state checking unit, and when the possibility of collision is judged, the type of a target to be collided is judged by a target type identification unit;
step S2: when the collision target type judging unit judges that an object needs to be protected, the energy absorption box controller sends an instruction and enters an octagonal folding and crushing mode, the octagonal folding and crushing mode enables the energy absorption box 1 to carry out octagonal folding and crushing through controlling the actuator 3, and collision peak force is reduced, so that overhigh damage of the collided object caused by overhigh instantaneous collision contact force is reduced;
step S21: the energy absorption box controller controls four groups of actuators 3 which are arranged in an octagonal shape, wherein two groups of four actuators 3 which are in a quadrilateral shape attract each other, the other two groups of four actuators 3 which are in a quadrilateral shape repel each other, and the magnetic force directions of the four groups of actuators 3 in two adjacent rows are opposite;
and step S3: when the collision target type judging unit judges that the vehicle types are the same, the energy-absorbing box controller sends an instruction and enters a quadrilateral folding crushing mode, the quadrilateral folding crushing mode enables the energy-absorbing box 1 to carry out quadrilateral folding crushing through controlling the actuator 3, and the energy-absorbing box 1 can have relatively high collision contact force and energy-absorbing effect;
step S31: the energy absorption box controller controls two groups of actuators 3 which are arranged in a quadrilateral way, wherein one group of two symmetrical actuators 3 attract each other, the other group of two symmetrical actuators 3 repel each other, and the magnetic force directions of the two groups of actuators 3 in two adjacent rows are opposite;
and step S4: when the type of a collision target is judged to be a wall body, a large commercial vehicle and an object with larger rigidity, the energy absorption box controller sends an instruction and enters an anti-folding and crushing mode, the anti-folding and crushing mode enables the energy absorption box 1 to resist folding and crushing through controlling the actuator 3, and when the structure of the energy absorption box 1 is larger in rigidity, the energy absorption box 1 is not easy to crush, so that parts behind the anti-collision beam can be well protected, and a larger living space is provided for passengers;
step S41: the energy absorption box controller controls four groups of actuators 3 which are arranged in an octagonal shape, wherein the eight actuators 3 in the octagonal shape attract each other, and the magnetic force directions of the four groups of actuators 3 in two adjacent rows are the same.
Example 3
Judging the relation between the acting force generated by the electromagnetic coil and the input voltage:
referring to fig. 4, the magnetomotive force is calculated:
E＝IN
number of turns:
wherein:
l is the winding width; d2 is the outer diameter of the winding; d1, winding the inner diameter; d is the diameter of the enameled wire
The length of the winding is
According to the formula of resistance:
wherein: ρ is the resistivity of the winding
According to the following steps:
so the magnetomotive force:
calculating the electromagnetic induction intensity:
IN＝∑(HL)
wherein: h is the magnetic field intensity; l is the magnetic media length.
In general, except for the air gap, the rest of the solenoid valve is made of a material with good magnetic conductivity, and most of the magnetomotive force drops are at the air gap, namely:
IN＝∑(HL)≈H 0 δ
wherein: h 0 Is the magnetic field strength at the air gap, delta is the air gap length
Wherein: b is 0 Is the magnetic induction in the air gap; mu.s 0 Is the magnetic permeability.
Therefore:
therefore, the method comprises the following steps:
calculation of the electromagnetic force F:
S 0 air gap area
To obtain
The time for the electromagnetic coil to obtain a stable electromagnetic force after applying a stable input voltage is t Magnetism I.e. the time required for the magnetic force of the coil to reach a target value, generally with a time constant τ = L/R, after 5 τ, the voltage and current of the electromagnetic coil tend to stabilize, i.e. the magnetic force of the electromagnetic coil reaches a maximum at 5 τ.
t Magnetism ＝5τ＝5L/R
Wherein L is inductance and R is resistance.
Example 4
Referring to fig. 5 to 7, when the collision target recognition unit is an object to be protected, the electromagnetic coil mounted on the crash box 1 realizes the quadrilateral folding crushing of the crash box 1 through the periodic action of the magnetic force in the height direction.
Referring to fig. 8 to 10, when the collision target does not threaten the living space of the passenger, the electromagnetic coil installed on the crash box 1 realizes the octagonal folding crushing of the crash box 1 through the periodic action of the magnetic force in the height direction.
Referring to fig. 11 to 13, when a collision object threatens the living space of a passenger, the electromagnetic coil mounted on the crash box 1 resists deformation of the crash box 1 by a periodic action of magnetic force in the height direction.
Referring to fig. 14, it can be seen from comparison of collision counter forces of the energy absorption boxes 1 in the three deformation modes that, when the reinforced control scheme is adopted, the energy absorption box 1 has an initial peak force higher than 100kN, and the energy absorption box 1 has the highest strength at the moment, so that support can be provided for obtaining a larger passenger living space; when the energy absorption box 1 is subjected to four-deformation folding crushing, the initial peak force is only 40kN, and the counter force of the energy absorption box 1 is always the lowest of the three schemes, so that the energy absorption box can be used in a scene with collision objects needing to be protected; the octagonal folding crushing mode has a peak value lower than that of the strengthening control scheme, but the average value of the reaction force is similar to that of the strengthening control scheme, so that the octagonal folding crushing mode can be applied to a scene of a collision object with similar structural strength, can effectively reduce the action of inertia force on passengers caused by high peak value force, and can also effectively absorb energy.
Calculating the braking distance s and the braking time t of the vehicle under the maximum braking force, and the relative distance L between the vehicle and the front target after the time t; wherein the content of the first and second substances,
the calculation method of the braking distance s comprises the following steps:
the calculation method of the braking time t comprises the following steps:
the method for calculating the relative distance L between the vehicle and the front target after the time t is as follows:
L＝L 0 +t(u r +u a0 )
in the above expression: tau. 1 ′τ 1 "driver reaction time, τ 2 ' time required for brake to work, [ tau ] 2 "2" is the brake force growth time, u a0 To initiate braking of the vehicle, a bmax For maximum braking deceleration, L 0 And u r The relative distance and the relative speed of the front target detected by the sensor module are respectively;
step two: comparing L with s, and judging whether unavoidable collision occurs or not;
if L is greater than s, judging that unavoidable collision does not occur;
and if L < s, judging that the unavoidable collision occurs.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. An automobile pre-collision device capable of actively controlling crushing deformation of an energy absorption box comprises: the system comprises a vehicle-mounted CAN network, a collision pre-judging unit, a target motion state checking unit and a target type identifying unit, wherein the vehicle-mounted CAN network is used for obtaining and transmitting the traffic information of the vehicle; the collision pre-judging unit is used for receiving the traffic information of the vehicle transmitted by the vehicle-mounted CAN network, receiving the relative traffic information between the obstacle and the vehicle transmitted by the target motion state checking unit, and judging whether the collision between the vehicle and the obstacle CAN not be avoided; the target motion state checking unit is used for detecting and transmitting relative traffic information of the barrier and the vehicle; the target type identification unit is used for identifying the type of a target obstacle; the automobile bumper system is characterized by further comprising an energy absorption box, an energy absorption box controller and an energy absorption box control mechanism, wherein the energy absorption box, the energy absorption box controller and the energy absorption box control mechanism are arranged on the automobile body; the energy-absorbing box is by the cylindrical supporter that the metal thin wall constitutes, energy-absorbing box control mechanism installs on the energy-absorbing box, energy-absorbing box control mechanism includes: actor and actor power supply, the actor comprises an electro-magnet that the winding has the coil, and this electro-magnet is perpendicular with the axle center direction of energy-absorbing box, and eight are listed as four group actors altogether and distribute in the symmetric position of energy-absorbing box pipe wall, and every row of actor that the equipartition set up is vertical links firmly on the pipe wall, actor power supply is used for supplying power for the actor, the energy-absorbing box controller passes through actor power supply control actor action, the energy-absorbing box controller includes the folding conquassation mode of quadrangle of energy-absorbing box, the folding conquassation mode of octagon and the anti conquassation mode of conquassation, and wherein the folding conquassation mode of quadrangle does: the energy absorption box controller controls two groups of actuators which are arranged in a quadrilateral way, wherein one group of two symmetrical actuators attract each other, the other group of two symmetrical actuators repel each other, and the magnetic force directions of the two groups of actuators in two adjacent rows are opposite; the octagonal folding and crushing mode is as follows: the energy absorption box controller controls four groups of actuators which are arranged in an octagonal shape, wherein two groups of four actuators which are in a quadrilateral shape attract each other, the other two groups of four actuators which are in a quadrilateral shape repel each other, and the magnetic force directions of the four groups of actuators in two adjacent rows are opposite; the folding and crushing resistant mode is that the energy absorption box controller controls four groups of actuators which are arranged in an octagonal shape, wherein eight actuators in the octagonal shape of the four groups attract each other, and the magnetic force directions of the four groups of actuators in two adjacent rows are the same.
2. The automobile pre-collision device capable of actively controlling the crushing deformation of the energy absorption box according to claim 1, wherein eight vertically arranged rows of actuators are uniformly distributed on the circumference of the energy absorption box and are vertically staggered.
3. A control method of an automobile pre-collision device capable of actively controlling crushing deformation of an energy absorption box is characterized by comprising the following steps:
step S1: the vehicle speed and the acceleration of the vehicle are obtained through a vehicle-mounted CAN network, whether collision CAN not be avoided or not is judged by combining the detection of a target motion direction and the detection of a target motion state checking unit, and when the possibility of collision is judged, the type of a target to be collided is judged by a target type identification unit;
step S2: when the collision target type judging unit judges that an object needs to be protected, the energy absorption box controller sends an instruction and enters an octagonal folding and crushing mode, the octagonal folding and crushing mode enables the energy absorption box to carry out octagonal folding and crushing through the control actuator, and collision peak force is reduced, so that overhigh damage of the collided object caused by overhigh instantaneous collision contact force is reduced;
and step S3: when the collision target type judging unit judges that the vehicle types are the same, the energy absorption box controller sends an instruction and enters a quadrilateral folding crushing mode, and the quadrilateral folding crushing mode enables the energy absorption box to carry out quadrilateral folding crushing by controlling the actuator, so that the energy absorption box has relatively high collision contact force and energy absorption effect;
and step S4: when the type of the collision target is judged to be a wall body, a large commercial vehicle and an object with larger rigidity, the energy absorption box controller sends an instruction and enters an anti-folding crushing mode, the anti-folding crushing mode enables the energy absorption box to carry out anti-folding crushing through controlling an actuator, and when the rigidity of the structure of the energy absorption box is larger, the energy absorption box is not easy to crush, so that parts behind the protective anti-collision beam can be changed well, and a larger living space is provided for passengers.
4. The automobile pre-crash device capable of actively controlling crush deformation of a crash box according to claim 1, wherein in step S2, the manner of the octagonal folding crush mode control actuator is as follows:
step S21: the energy absorption box controller controls four groups of actuators which are arranged in an octagonal shape, wherein two groups of four actuators which are in a quadrilateral shape attract each other, the other two groups of four actuators which are in a quadrilateral shape repel each other, and the magnetic force directions of the four groups of actuators in two adjacent rows are opposite.
5. The automobile pre-crash device capable of actively controlling crush deformation of the energy absorption box as claimed in claim 1, wherein in step S3, the quadrilateral folding crush mode control actuator is implemented as follows:
step S31: the energy absorption box controller controls two groups of actuators which are arranged in a quadrilateral mode, wherein one group of two symmetrical actuators attract each other, the other group of two symmetrical actuators repel each other, and the magnetic force directions of the two groups of actuators in two adjacent rows are opposite.
6. The device of claim 1, wherein in step S4, the anti-collapse mode control actuator is operated in the following manner:
step S41: the energy absorption box controller controls four groups of actuators which are arranged in an octagonal shape, wherein the eight actuators in the octagonal shape in the four groups attract each other, and the magnetic force directions of the four groups of actuators in two adjacent rows are the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211226595.3A CN115416603A (en) | 2022-10-09 | 2022-10-09 | Automobile pre-collision device capable of actively controlling crushing deformation of energy absorption box and control method |
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| CN202211226595.3A CN115416603A (en) | 2022-10-09 | 2022-10-09 | Automobile pre-collision device capable of actively controlling crushing deformation of energy absorption box and control method |
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