CN112706762B - Active separation method for vehicle-mounted assembly during high-speed collision - Google Patents
Active separation method for vehicle-mounted assembly during high-speed collision Download PDFInfo
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- CN112706762B CN112706762B CN202110111840.5A CN202110111840A CN112706762B CN 112706762 B CN112706762 B CN 112706762B CN 202110111840 A CN202110111840 A CN 202110111840A CN 112706762 B CN112706762 B CN 112706762B
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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, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/08—Active safety systems predicting or avoiding probable or impending collision or attempting to minimise its consequences
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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, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/08—Active safety systems predicting or avoiding probable or impending collision or attempting to minimise its consequences
- B60W2030/082—Vehicle operation after collision
Abstract
The invention discloses an active disengaging of a vehicle-mounted assembly during high-speed collisionA departure method for judging whether a collision occurs and the degree of severity of the collision based on the collision acceleration signal, the degree of severity of the collision being determined by the equivalent collision velocity VsCharacterizing; comparing collision velocity V one by onesThe theoretical collision speed V corresponding to the combination of the X assembly and the X assemblyXWhen V isX＜Vs＜VX+1And when the assembly is in the X-th assembly combination, the X is more than or equal to 1. The invention introduces a correlation control method of combination of collision degree and assembly separation, realizes the explosion of self-explosion bolts at different positions and quantities under different collision degrees, accurately controls the separation of the assembly, and reduces the damage of collision to passengers and the vehicle maintenance economy after collision.
Description
Technical Field
The invention discloses a vehicle-mounted assembly separation method in high-speed collision, belongs to the technical field of automobiles, and particularly discloses a vehicle-mounted assembly active separation method in high-speed collision.
Background
Devices in passenger vehicles, such as heat dissipation systems, cooling systems, power systems, transmission systems, exhaust systems, chassis, vehicle racks, and the like, which do not directly provide collision protection for passengers, account for the mass of the equipment from 1/3 to 2/3. The devices are rigidly connected with the vehicle body, and are decelerated synchronously with the vehicle body in the collision process, and the kinetic energy of the devices is absorbed by the vehicle body in a short time, so that the energy absorption burden of the vehicle body is increased; the structures such as an engine, a gearbox, a radiator, a storage battery and the like arranged in the engine room occupy energy absorption space, and the safety performance of the vehicle is adversely affected.
The vehicle-mounted assembly active disconnection technology adopts an active disconnection connection mode at a mounting and fixing point of a collision detachable assembly. By calibrating the active separation condition of each assembly, a disconnection signal is sent to the assemblies when necessary in the high-speed collision process, and the active separation of a non-collision protection device is realized. The rigid load of the vehicle body is reduced, so that the energy absorption burden of the vehicle body is reduced, the energy absorption time of the vehicle body is prolonged, the deformable space of the vehicle body is increased, and the purpose of reducing the injury of passengers is finally achieved. This technology is prospective and may be developed in this direction in the future.
Chinese utility model patent CN204184298U discloses an utilize active system of breaking away from technique to power assembly control, include automobile body longeron, automobile power assembly and establish engine and gearbox in automobile power assembly, the engine passes through engine suspension and automobile body longeron and connects, the gearbox passes through gearbox suspension and automobile body longeron and connects, the system in still including the first auto-explosion formula bolt that has blast apparatus, second auto-explosion formula bolt and engine controller. The technology has the advantages that the vehicle acceleration sensor and the collision sensor are used for prejudging the collision, an instruction is sent to the self-explosion type bolt igniter, the self-explosion type bolt igniter explodes the first self-explosion type bolt and the blasting device in the second self-explosion type bolt, the purpose that the power assembly is separated from the vehicle body is achieved, and therefore the situation that the power assembly caused by the collision invades into the passenger compartment along with the deformation of the vehicle body to injure people in the passenger compartment is avoided. Although the self-explosion bolt is disclosed by adopting an active disengagement technology to achieve energy unloading, the engine gearbox is simply disengaged, the fuel oil, the exhaust gas and other vehicle body bearing systems are not disengaged, the effect of reducing the injury of passengers is limited, and a correlation control method of the collision degree and assembly disengagement combination is not introduced. The self-explosion bolts with different positions and quantities of explosion under different collision degrees are not realized, and the maintenance economy can not be considered
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a vehicle-mounted assembly active separation method in high-speed collision, which introduces a correlation control method of combination of collision degree and assembly separation, realizes explosion of self-explosion bolts at different positions and quantities under different collision degrees, accurately controls the separation of the assembly and gives consideration to the vehicle maintenance economy after collision.
The invention discloses a vehicle-mounted assembly active separation method in high-speed collision, which judges whether collision occurs or not based on collision acceleration signals; judging whether the acquired real-time collision speed V is after collisionS(ii) a Comparing real-time collision velocity V one by oneSThe theoretical collision speed V corresponding to the combination of the X assembly and the X assemblyXWhen V isX＜VS＜VX+1And actively disconnecting the Nth assembly combination, wherein X is more than or equal to 1.
In a preferred embodiment of the invention, the X assembly combination is disengaged from the corresponding theoretical collision velocity VXThe method for determining the passenger injury degree index comprises the steps of obtaining the passenger injury degree index threshold value and the collision vehicle speed/passenger injury degree index curve based on the preset passenger injury degree index threshold value.
In a preferred embodiment of the present invention, the crash vehicle speed/occupant injury index curve is obtained by: acquiring a first passenger injury degree index when each single assembly is separated at each collision vehicle speed; acquiring a contribution rate G to the index of reducing the injury degree of the passengers when each single assembly is disengaged based on the first index of the injury degree of the passengers, determining the priority of disengagement of each assembly based on the contribution rate G, and forming an assembly disengagement gradient combination based on the priority; and acquiring a second passenger injury degree index when each gradient combination is separated at each collision vehicle speed, acquiring a contribution rate G to reducing the passenger injury degree index when each gradient combination is separated on the basis of the second passenger injury degree index, determining the separation priority of each gradient combination on the basis of the contribution rate G, and establishing a collision vehicle speed/passenger injury degree index curve.
In a preferred embodiment of the invention, the rate of contribution G to the reduction of the occupant injury index at each detachment of a single unit is the sum of the occupant injury indices at each crash vehicle speed at the detachment of the single unit.
In a preferred embodiment of the present invention, the contribution rate G to the index of decreasing the degree of occupant injury if the ith subassembly is disengagediGreater than the contribution rate G of the (i + 1) th single assembly to the reduction of the injury degree index of the passengers after the single assembly is separatedi+1If the priority of the ith single assembly is higher than that of the (i + 1) th single assembly, i is larger than or equal to 1.
In a preferred embodiment of the invention, the detachment gradient combination is defined as the detachment combination corresponding to the nth gradient being a single assembly with a priority of 1 st, 2.
In a preferred embodiment of the invention, the vehicle-mounted ECU acquires the real-time collision speed V based on the real-time acceleration, speed and energy change rates。
In a preferred embodiment of the invention, the active disconnection method is to realize active disconnection between the vehicle-mounted assembly and the vehicle body by using a blasting piece.
In a preferred embodiment of the invention, the explosive element includes, but is not limited to, an explosive bolt internally filled with right powder and an ignition device.
In a preferred embodiment of the invention, the connection point between each vehicle-mounted assembly and the vehicle body is connected by explosion bolts, and the ignition device of each explosion bolt is connected with the vehicle-mounted ECU.
The invention has the beneficial effects that: the invention realizes that the mass of the whole vehicle 1/3-2/3 is actively separated from the vehicle body in high-speed collision, and reduces the rigid load of the vehicle body, thereby reducing the energy absorption burden of the vehicle body, prolonging the energy absorption time, increasing the deformable space of the vehicle body and finally achieving the purpose of reducing the injury of passengers; the invention introduces the correlation control method of the combination of collision degree and assembly separation, realizes the explosion of self-explosion bolts at different positions and quantities under different collision degrees, accurately controls the separation of the assembly, and considers the vehicle maintenance economy after collision; the invention introduces the inventive concept of priority detonation control based on speed based on the active disengagement technology of the self-explosion bolt, fully analyzes the promotion effect of the injury index of passengers after the assemblies are disengaged under each equivalent vehicle speed, and draws the corresponding curve of the equivalent vehicle speed-the injury index of passengers after each assembly is disengaged; setting the priority of each assembly disengagement according to the damage curve corresponding to each assembly disengagement; then, an occupant injury index threshold value is set, and according to an equivalent vehicle speed-occupant injury index curve, equivalent collision speed corresponding to each assembly disengagement can be obtained, namely, the assembly active disengagement condition is obtained.
Drawings
FIG. 1 is a flow chart of a method of the present invention for actively disengaging a vehicle assembly during a high speed collision;
FIG. 2 is a schematic diagram illustrating the release strategy of the vehicle-mounted assembly active release method during high-speed collision according to the present invention;
FIG. 3 is an assembly disengagement-occupant injury index analysis flow of the vehicle-mounted assembly active disengagement method during high-speed collision according to the present invention;
FIG. 4 is a schematic view of a vehicle assembly to body connection point for a method of actively disengaging a vehicle assembly during a high speed collision in accordance with the present invention;
FIG. 5 is a schematic illustration of an active blasting element of a vehicle assembly in a high speed collision in accordance with the present invention;
in the figure, 1-radiator mounting point; 2-engine gearbox mounting point; 3-front suspension mounting points; 4-exhaust system mounting point; 5-fuel tank mounting point; 6-rear suspension mounting points; 7-luggage rack mounting point; 8-a wire; 9-a nut; 10-a first connector; 11-a second connection; 12-explosive bolts; 13-gunpowder; 14-ignition means.
Detailed Description
The invention will now be described in further detail, including the preferred embodiments, with reference to the accompanying drawings and by way of illustration of some alternative embodiments of the invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
The invention discloses a vehicle-mounted assembly active separation method in high-speed collision, which judges whether collision occurs or not based on collision acceleration signals; judging whether the acquired real-time collision speed V is after collisions(ii) a Comparing real-time collision velocity V one by onesThe theoretical collision speed V corresponding to the combination of the X assembly and the X assemblyXWhen V isX＜VS＜VX+1And actively disconnecting the Nth assembly combination, wherein X is more than or equal to 1.
Preferably, the Xth assembly combination is out of the corresponding theoretical collision velocityDegree VXThe method for determining the passenger injury degree index comprises the steps of obtaining the passenger injury degree index threshold value and the collision vehicle speed/passenger injury degree index curve based on the preset passenger injury degree index threshold value.
Preferably, the method for obtaining the crash vehicle speed/occupant injury degree index curve comprises the following steps: acquiring a first passenger injury degree index when each single assembly is separated at each collision vehicle speed; acquiring a contribution rate G to the index of reducing the injury degree of the passengers when each single assembly is disengaged based on the first index of the injury degree of the passengers, determining the priority of disengagement of each assembly based on the contribution rate G, and forming an assembly disengagement gradient combination based on the priority; and acquiring a second passenger injury degree index when each gradient combination is separated at each collision vehicle speed, acquiring a contribution rate G to reducing the passenger injury degree index when each gradient combination is separated on the basis of the second passenger injury degree index, determining the separation priority of each gradient combination on the basis of the contribution rate G, and establishing a collision vehicle speed/passenger injury degree index curve.
Preferably, the contribution rate G to the index of reducing the degree of injury of the occupant when each single unit is disengaged is the sum of the corresponding indexes of the degree of injury of the occupant at each collision vehicle speed when the single unit is disengaged.
Preferably, the contribution rate G to the index of reducing the degree of occupant injury if the ith single assembly is disengagediGreater than the contribution rate G of the (i + 1) th single assembly to the reduction of the injury degree index of the passengers after the single assembly is separatedi+1If the priority of the ith single assembly is higher than that of the (i + 1) th single assembly, i is larger than or equal to 1.
Preferably, the detachment gradient combination is defined such that the detachment combination corresponding to the nth gradient is a single assembly with a priority of 1 st, 2.
Preferably, the vehicle-mounted ECU acquires the real-time collision speed V based on the real-time acceleration, speed and energy change rates。
Preferably, the active disconnection method is to realize active disconnection between the vehicle-mounted assembly and the vehicle body by using a blasting piece.
Preferably, the explosive member includes, but is not limited to, an explosive bolt internally filled with right powder and an ignition device.
Preferably, the connection point between each vehicle-mounted assembly and the vehicle body is connected through an explosion bolt, and the ignition device of each explosion bolt is connected with the vehicle-mounted ECU.
The invention is further explained below with reference to the drawings in which:
firstly, the influence effect of the assembly separation on the injury degree index of the passengers at each collision vehicle speed is fully analyzed, as shown in a flow chart 3. According to the detachable assembly C in the figure 1, the damage values of all parts of the driver can be obtained by combining the collision vehicle speed V and inputting a simulation model, and then the passenger damage degree indexes corresponding to C and V are obtained.
The occupant injury indices calculated for different breakaway assemblies C (C0 — no assembly breakaway, Ci — assembly i breakaway in fig. 1) and crash speeds V are tabulated as shown in table 1:
TABLE 1 Single-Assembly Release-occupant injury degree index correspondence Table
Further, calculating the priority of the assembly disengagement according to the contribution rate G of each assembly disengagement to the index for reducing the injury degree of the passengers; that is, if the contribution rate of the index for reducing the degree of injury of the passenger after the assembly i is separated is larger than that of the assembly i +1 (G)Ci＞GCi+1) Then the drop-out priority for assembly i is higher than for assembly Ci + 1.
GCi＝∑P0#j-∑Pi#j
The assemblies are reordered according to the priority of disengagement of each assembly, and the assembly with the highest priority is defined as a disengagement assembly 1, followed by a disengagement assembly 2, and the process is carried out in sequence.
According to the failure priority of each assembly, assembly disengagement gradient combinations are formed, and the combination list is shown in table 2.
| Gradient of | Gradient | 0 | |
|
|
Gradient i |
| Disengaging combination | Z0 | Z1 | Z1&2 | Z1&2&3 | Z1&...i | |
| Description of the departure | Without | Assembly | 1 disengagement | 1-2 disengagement of the assembly | 1-3 disengagement of the assembly | Assembly 1-i detachment |
TABLE 2 gradient of detachment of the Assembly
For each assembly detachment gradient combination of table 2, the occupant injury degree index corresponding to each detachment gradient is analyzed according to the injury degree index analysis flow chart 3 (see table 3).
TABLE 3 Association detachment-occupant injury degree index corresponding relation table
Drawing a corresponding 'collision vehicle speed-passenger injury degree index curve' after each assembly is separated according to a table 3, wherein the curve is shown in a figure 2;
and finally, setting an index threshold value of the injury degree of the passenger, and obtaining the collision speed corresponding to the separation of each assembly according to the failure combination 'collision speed-index curve of the injury degree of the passenger', namely the active separation condition of the assembly.
After a collision occurs, the generated acceleration signal is collected by a collision acceleration sensor, the ECU firstly carries out primary judgment on the acceleration signal, judges whether a set acceleration threshold value is reached, and if the set acceleration threshold value is not reached, the algorithm is closed; if the real-time speed and the energy change rate are reached, the collision speed needs to be predicted according to the real-time speed and the energy change rate; and then, judging whether the speed reaches a disengagement threshold value of the assembly I step by step, if not, closing the algorithm, and if so, sending a disengagement signal to a fixing device of the assembly I. And then gunpowder in the fixing device of the assembly I is ignited, the fixing device is separated, the separation of the assembly I and the vehicle body is realized, and the energy unloading is realized. In the same way, when the speed reaches the separation threshold of the assembly II, a separation signal is sent to the fixing devices of the assemblies I and II, so that the inner gunpowder is fixed by the assemblies I and II to be ignited, the separation of the assemblies I and II from the vehicle body is realized, and the energy unloading is realized; the same reason is not described again.
When the vehicle is used in the high-speed collision process, the vehicle assembly is actively separated from the vehicle body according to the set rule, the 1/3-2/3 collision energy can be actively controlled to be reduced, the safety of the vehicle is effectively improved, the life safety of drivers and passengers is ensured, meanwhile, each assembly of the vehicle is separated according to the collision intensity, the life safety of the drivers and passengers is ensured, and other negative effects such as maintenance cost increase and the like caused by the separation of each assembly are effectively reduced.
It should be understood that the above-mentioned embodiments are merely exemplary of the present invention, and not restrictive, and that any modifications, combinations, substitutions, improvements, etc. made within the spirit and scope of the present invention are included in the present invention.
Claims (8)
1. A vehicle-mounted assembly active separation method in high-speed collision is characterized in that: based on collision acceleration informationJudging whether collision occurs or not; obtaining real-time collision speed V after judging collisions(ii) a Comparing real-time collision velocity V one by onesThe theoretical collision speed V corresponding to the combination of the X assembly and the X assemblyXWhen V isX＜Vs＜VX+1When the assembly is not used, the X-th assembly combination is actively disconnected, and X is more than or equal to 1; the X-th assembly combination is separated from the corresponding theoretical collision velocity VXThe method comprises the steps of obtaining a passenger injury degree index curve based on a preset passenger injury degree index threshold value and a collision vehicle speed/passenger injury degree index curve; the method for acquiring the crash vehicle speed/passenger injury degree index curve comprises the following steps: acquiring a first passenger injury degree index when each single assembly is separated at each collision vehicle speed; acquiring a contribution rate G to the index of reducing the injury degree of the passengers when each single assembly is disengaged based on the first index of the injury degree of the passengers, determining the priority of disengagement of each assembly based on the contribution rate G, and forming an assembly disengagement gradient combination based on the priority; and acquiring a second passenger injury degree index when each gradient combination is separated at each collision vehicle speed, acquiring a contribution rate G to reducing the passenger injury degree index when each gradient combination is separated on the basis of the second passenger injury degree index, determining the separation priority of each gradient combination on the basis of the contribution rate G, and establishing a collision vehicle speed/passenger injury degree index curve.
2. The active disengagement method for the vehicle-mounted assembly in high-speed collision according to claim 1, characterized in that: and the contribution rate G of each single assembly to the reduction of the injury degree index of the passengers when the single assembly is separated is the sum of the corresponding injury degree index contribution rates of the passengers at each collision vehicle speed when the single assembly is separated.
3. The active disengagement method for the vehicle-mounted assembly in high-speed collision according to claim 1, characterized in that: the contribution rate G to the index of reducing the degree of injury of the passengers if the ith single assembly is separatediThe contribution rate G is larger than the contribution rate G of the (i + 1) th single assembly after being separated to the index of reducing the injury degree of the passengersi+1If the priority of the ith single assembly is higher than that of the (i + 1) th single assembly, i is larger than or equal to 1.
4. The active disengagement method for the vehicle-mounted assembly in high-speed collision according to claim 1, characterized in that: the combination of gradient departures is defined as the single assembly of the 1 st and 2 … N departure combination corresponding to the Nth gradient.
5. The active disengagement method for the vehicle-mounted assembly in high-speed collision according to claim 1, characterized in that: vehicle-mounted ECU acquires real-time collision speed V based on real-time acceleration, speed and energy change rates。
6. The active disengagement method for the vehicle-mounted assembly in high-speed collision according to claim 1, characterized in that: the active disconnection method is to realize active disconnection between the vehicle-mounted assembly and the vehicle body by utilizing the blasting piece.
7. The active disengagement method for vehicle-mounted assembly in high-speed collision according to claim 6, characterized in that: the explosive member includes, but is not limited to, an explosive bolt with an inner charge and an ignition device.
8. The active disengagement method for vehicle-mounted assembly in high-speed collision according to claim 6, characterized in that: the connection point between each vehicle-mounted assembly and the vehicle body is connected through an explosion bolt, and the ignition device of each explosion bolt is connected with the vehicle-mounted ECU.
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