CN111619505B - Safety belt buffer device based on shape memory alloy and control method thereof - Google Patents
Safety belt buffer device based on shape memory alloy and control method thereof Download PDFInfo
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- CN111619505B CN111619505B CN202010645861.0A CN202010645861A CN111619505B CN 111619505 B CN111619505 B CN 111619505B CN 202010645861 A CN202010645861 A CN 202010645861A CN 111619505 B CN111619505 B CN 111619505B
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- memory alloy
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- 229910001285 shape-memory alloy Inorganic materials 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 50
- 230000004308 accommodation Effects 0.000 claims description 4
- 229910004337 Ti-Ni Inorganic materials 0.000 claims description 3
- 229910011209 Ti—Ni Inorganic materials 0.000 claims description 3
- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical compound [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 9
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000003139 buffering effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 238000012887 quadratic function Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 208000025962 Crush injury Diseases 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/12—Construction of belts or harnesses
- B60R22/14—Construction of belts or harnesses incorporating enlarged restraint areas, e.g. vests, nets, crash pads, optionally for children
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
- B60R2022/286—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using deformation of material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Automotive Seat Belt Assembly (AREA)
Abstract
The invention discloses a safety belt buffer device based on shape memory alloy, comprising: the two shells form a containing chamber; the two turntables are rotatably arranged in the accommodating chamber and comprise a first sheave and a second sheave which are coaxially arranged; the two turntables are symmetrically connected; the two ends of the shape memory alloy belt are detachably fixed on the two second grooved wheels respectively; a heating circuit board connected with the shape memory alloy strip; one end of each silk ribbon is detachably fixed on the two first grooved wheels, and the two silk ribbons can drive the first rotary table and the second rotary table to reversely rotate; the sliding block is slidably arranged in the accommodating chamber, and the other ends of the two silk ribbons are symmetrically connected with the sliding block; one end of the pull rope is connected with the sliding block, and the other end of the pull rope is connected with a safety belt lock catch of the vehicle. The invention also discloses a control method of the safety belt buffer device based on the shape memory alloy, which enables the shape memory alloy belt to keep different heating temperatures through vehicle state parameters.
Description
Technical Field
The invention relates to the technical field of automobile braking, in particular to a safety belt buffer device based on shape memory alloy and a control method thereof.
Background
In order to reduce the tight crush injury of the safety belt on the human body during the emergency braking of the automobile, researchers have made a great deal of researches, and have obtained great achievements, mainly in the following ways:
firstly, the traditional safety belt and the safety airbag are combined into a whole in a mode of additionally installing the air bag on the safety belt, and when an accident car body is impacted, compressed air below a seat automatically inflates the safety belt. The inflatable safety belt can enlarge the contact area with the human body, tightly wrap the passengers and fix the passengers with the seat, and achieve the effect of safety protection. Although the aim of reducing the damage can be achieved by the mode, if the primary gas generator of the safety belt is improper in chemical component proportion, the airbag can not be normally unfolded when collision occurs, and potential safety hazards exist. In addition, the airbag type seat belt occupies a large space and is not beautiful.
The second kind, through ordinary metal material deformation play cushioning effect, split ring in fixed point energy-absorbing formula safety belt, the device can play effectual cushioning effect when the emergency braking in great speed range, but the metal can take place deformation repeatedly near a certain position and lead to metal fatigue, and fixed point and spacing point department screw remove many times, rotate the back and easily become flexible, have the potential safety hazard.
Thirdly, the spring is added in the safety belt lock catch or the retractor, and the occupied space is small, but if the stiffness coefficient is small, the situation that the speed is small before braking can only be met, when the speed is large, the spring can generate plastic deformation, and if the stiffness coefficient is large, the buffering purpose is difficult to achieve when the speed is small before braking.
Fourth, install safety rope and broken wall structure additional, the device will become invalid after once strike, and the practicality is too low, uses improperly and still can cause the unexpected broken string of safety rope.
Disclosure of Invention
The invention aims to design and develop a safety belt buffer device based on shape memory alloy, which converts large displacement into small displacement through grooved wheels with different diameters, so that the safety belt is prolonged for a certain distance during emergency braking through normal-temperature extension of the shape memory alloy, and the safety belt returns to the original length through heating the shape memory alloy after the braking is completed, thereby effectively relieving the constraint feeling and choking feeling of the safety belt to a driver during vehicle braking.
The invention also designs and develops a control method of the safety belt buffer device based on the shape memory alloy, and the driving state of the vehicle is judged according to the driving state parameters of the vehicle acquired by the sensor, and different heating modes are adopted for the shape memory alloy, so that the efficiency and the service life of the safety belt buffer device are improved.
The technical scheme provided by the invention is as follows:
A shape memory alloy based seat belt cushioning device comprising:
A first housing; and
A second housing detachably connected to the first housing and forming a first accommodation chamber having an open end;
One end of the first round shaft is fixed on the first shell, and the other end of the first round shaft is detachably arranged on the second shell;
A first rotating disc rotatably connected with the first shell, wherein the first rotating disc comprises a first sheave and a second sheave which are coaxially arranged;
The second rotary table comprises a third sheave and a fourth sheave which are coaxially arranged, the second rotary table is detachably and symmetrically connected with the first rotary table to form a second accommodating chamber, and the second rotary table is rotatably connected with the second shell;
One end of the shape memory alloy belt is detachably fixed on the second grooved pulley, and the other end of the shape memory alloy belt bypasses the first round shaft and is detachably fixed on the fourth grooved pulley;
a heating circuit board fixed in the first accommodating chamber and connected with the shape memory alloy strip;
a first ribbon one end of which is detachably fixed on the first sheave;
one end of the second silk ribbon is detachably fixed on the third grooved wheel;
The sliding block is slidably arranged in the first accommodating chamber and is connected with the other end of the first silk ribbon and the other end of the second silk ribbon;
one end of the pull rope is connected with the sliding block, and the other end of the pull rope penetrates through the opening end to be connected with a safety belt lock catch of the vehicle;
the diameter of the first grooved wheel is larger than that of the second grooved wheel, the diameter of the third grooved wheel is larger than that of the fourth grooved wheel, and the first silk ribbon and the second silk ribbon can drive the first rotary table and the second rotary table to reversely rotate.
Preferably, the method further comprises:
A shutter disposed in the first accommodation chamber for restricting a moving position of the slider;
One end of the second round shaft is fixed on the second shell, and the other end of the second round shaft is detachably arranged on the first shell;
Wherein the shape memory alloy ribbon bypasses the second circular axis;
And the third circular shaft is arranged on the baffle plate, and both ends of the shape memory alloy belt bypass the third circular shaft.
Preferably, the first sheave, the second sheave, the third sheave and the fourth sheave are provided with polygonal grooves with circumscribed surfaces.
Preferably, the method further comprises:
And the first fixing plugs are detachably arranged in the polygonal grooves respectively and are used for fixing the first silk ribbon, the second silk ribbon and the shape memory alloy ribbon on the first turntable and the second turntable.
Preferably, the second accommodating chamber further includes:
The connecting shaft passes through the first rotary table and the second rotary table in a rotatable mode respectively, and two ends of the connecting shaft are arranged on the first shell and the second shell;
And one end of the first spring is connected with the first rotating disc, and the other end of the first spring is connected with the second rotating disc.
Preferably, the shape memory alloy strip is formed by uniformly arranging a plurality of Ti-Ni-based shape memory alloy wires in a twist shape.
Preferably, the method further comprises:
a vehicle speed sensor provided in a vehicle GPS;
A temperature sensor disposed on the heating circuit board, and connected with the shape memory alloy strip;
a brake sensor disposed at a pedal reference point.
A control method of a safety belt buffer device based on shape memory alloy, which uses the safety belt buffer device based on shape memory alloy, comprises the following steps:
step one, collecting the speed, the acceleration of the vehicle and the temperature of the shape memory alloy belt;
step two, when the vehicle is started, the heating circuit board preheats the shape memory alloy belt, and the preheating temperature is not more than 35 ℃;
Step three, when the vehicle runs, the heating temperature of the shape memory alloy belt by the heating circuit board meets the following conditions:
wherein T is the heating temperature of the shape memory alloy belt by the heating circuit board, and v is the speed of the vehicle;
and step four, heating the shape memory alloy belt to 90 ℃ by the heating circuit board after the braking of the vehicle is finished, and recovering the original length of the shape memory alloy belt.
Preferably, the vehicle braking is finished by:
Fv＝0；
Where Fv is brake pedal pressure.
The beneficial effects of the invention are as follows:
According to the safety belt buffer device based on the shape memory alloy, large displacement is converted into small displacement through the grooved wheels with different diameters, so that the safety belt is prolonged by a certain distance during emergency braking through normal-temperature extension of the shape memory alloy, the safety belt is buffered, the safety belt is restored to the original length through heating of the shape memory alloy after braking is completed, and two rotating discs which rotate reversely are used, so that power transmission is effectively realized, the constraint feeling and choking feeling of the safety belt to a driver during vehicle braking are relieved, and meanwhile, the reduction of the service life of the safety belt is avoided when the safety belt is at the maximum stretching limit for a long time.
According to the control method of the safety belt buffer device based on the shape memory alloy, which is designed and developed by the invention, the running state of the vehicle is judged according to the running state parameters of the vehicle acquired by the sensor, and different heating modes are adopted for the shape memory alloy, so that the efficiency and the service life of the safety belt buffer device are improved.
Drawings
Fig. 1 is a schematic view of the overall structure of a shape memory alloy-based seat belt buffering device according to the present invention.
Fig. 2 is a schematic view of the overall structure of the first accommodating chamber according to the present invention.
Fig. 3 is a schematic front view of the first accommodating chamber according to the present invention.
Fig. 4 is a schematic structural view of a shape memory alloy-based seat belt buffering device according to the present invention.
Fig. 5 is a schematic structural view of the first housing according to the present invention.
Fig. 6 is a schematic diagram of a side structure of the turntable according to the present invention.
Fig. 7 is a schematic view of another side structure of the turntable according to the present invention.
Fig. 8 is a schematic structural view of the connecting shaft according to the present invention.
Fig. 9 is a schematic structural view of the second transmission device according to the present invention.
Fig. 10 is a schematic diagram of an assembly structure of the second transmission device according to the present invention.
FIG. 11 is a schematic diagram of the relationship between the heating temperature of the shape memory alloy strip and the vehicle speed according to the present invention.
Detailed Description
The present invention is described in further detail below to enable those skilled in the art to practice the invention by reference to the specification.
As shown in fig. 1,2 and 3, the seat belt buffer device based on the shape memory alloy provided by the invention comprises: the safety belt is prolonged by the extensibility of the shape memory alloy, so that a driver does not have strong choking feeling and pressing feeling during emergency braking.
As shown in fig. 4, the second shell 102 is connected with the first shell 101 in a one-to-one matching way through 4 bolts 108 and 4 nuts 103 to form a shell, the bottom of the shell is welded below the inner side of the seat, and a first accommodating chamber with an open end is arranged inside the shell; the structure of the second housing 102 is identical to that of the first housing 101.
As shown in fig. 5, the first housing 101 includes: a first circular shaft 104, a second circular shaft (not shown), a circular shaft fixing hole 105, a baffle 106 and a fixing seat 107, wherein the baffle 106 is transversely arranged in the first shell 101; one end of a first circular shaft 104 is fixed on the first shell 101, one end of a second circular shaft is fixed on the second shell 102, and two circular shaft fixing holes 105 corresponding to the first circular shaft 104 and the second circular shaft are formed in the first shell 101 and the second shell 102.
As shown in fig. 2, the heating circuit board 160 is fixed in the first accommodating chamber, the third circular shaft 170 is vertically fixed on the baffle 106, the slider 120 is slidably disposed in the first accommodating chamber, and the moving position of the slider 120 is limited by the baffle 106, one end of the pull rope 110 is connected with a fixing mechanism such as a belt buckle of a vehicle through the opening end, and the other end is wound on the top of the slider 120; the first transmission device 130 is used for connecting the sliding block and the second transmission device 140, and the second transmission device 140 is fixed in the first accommodating chamber through a connecting shaft 141; after bypassing the third circular shaft 170, the first circular shaft 104 and the second circular shaft, the shape memory alloy belt 150 is fixed on the second transmission device 140 through two small fixing plugs 181, and one end of the shape memory alloy belt 150 is connected with the heating circuit board 160; the shape memory alloy belt is formed by uniformly arranging a plurality of Ti-Ni-based shape memory alloy wires in a twist shape. The third circular shaft 170, the first circular shaft 104 and the second circular shaft are used for increasing the length of the shape memory alloy strip 150 in the device, so that the shape memory alloy strip 150 has larger elongation due to smaller deformation elongation of the shape memory alloy strip 150.
As shown in fig. 4, the first transmission 130 includes: first ribbon 131 and second ribbon 132, as shown in fig. 9, the second transmission 140 includes: the first rotating disc 142a, the second rotating disc 142b, the first bearing 143a, the second bearing 143b and the spring 144, wherein the first rotating disc 142a and the second rotating disc 142b have identical structures, as shown in fig. 6 and 7, and the first rotating disc 142a includes: the novel energy-saving pulley comprises a first sheave 201, a second sheave 202, a first through hole 203, a first groove 205 and a second groove 204, wherein the first sheave 201 and the second sheave 202 are coaxially arranged, the diameter of the second sheave 202 is smaller than that of the first sheave 201, the sheaves with different diameters are used for converting large displacement into small displacement similar to a lever, the first through hole 203 is arranged in the center of the first sheave 201 and the center of the second sheave 202, the first groove 205 with a polygonal structure is circumscribed on the first sheave 201, and the second groove 204 with a polygonal structure is circumscribed on the second sheave 202; the second turntable 142b has a third sheave and a fourth sheave (not shown), the diameter of the third sheave being larger than that of the fourth sheave, and the second turntable 142b is detachably and symmetrically connected with the first turntable 142a to form a second receiving chamber.
As shown in fig. 8, the connection shaft 141 includes a first portion 211, 2 second portions 212, and 2 third portions 213, the diameters of the first portion 211, the 2 second portions 212, and the 2 third portions 213 sequentially decrease, the 2 second portions 212 are disposed at both ends of the first portion 211, and the 2 third portions 213 are disposed at the other ends of the 2 second portions 212, respectively.
As shown in fig. 10, the first bearing 143a and the second bearing 143b are respectively sleeved on the 2 second portions, so as to rotatably sleeve the first rotating disc 142a and the second rotating disc 142b on the connecting shaft 141; the 2 third portions 213 are connected to the fixing bases 107 on the first and second housings 101 and 102 through the first through holes 203 of the second turntable 142b and the first turntable 142a, respectively; the spring 144 is sleeved on the outer sides of the first bearing 143a and the second bearing 143b, and two ends of the spring 144 are respectively connected with the first rotating disc 142a and the second rotating disc 142b, so that the first rotating disc 142a and the second rotating disc 142b are automatically aligned.
As shown in fig. 2, 4 and 10, the 2 large fixing plugs 182 and the 2 small fixing plugs 181 are wedges, the first grooves 205 on the first rotating disc 142a and the second rotating disc 142b are matched with the large fixing plugs 182, and the second grooves 204 are matched with the small fixing plugs 181. The large fixing plug 182 is linked and fixed with the first rotating disc 142a and the second rotating disc 142b through wedge blocks, and one end of the first ribbon 131 is fixed between the first groove 205 of the first rotating disc 142a and the large fixing plug 182, and the other end of the first ribbon is detachably arranged at one side of the sliding block 120; a second ribbon 132 having one end fixed between the first groove 205 of the second rotary disc 142b and the large fixing plug 182 and the other end detachably disposed at the other side of the slider 120; the two ends of the first ribbon 131 and the second ribbon 132 are rectangular buckles, the length of the shorter side of the rectangular buckle is smaller than the length of the opening on the sliding block 120 for passing through the first ribbon 131 and the second ribbon 132, the thickness of the rectangular buckle is smaller than the width of the opening on the sliding block 120 for passing through the first ribbon 131 and the second ribbon 132, after the shorter side of the rectangular buckle passes through the opening, the first ribbon 131 and the second ribbon 132 can be fixed with the sliding block 120 when the long side of the rectangular buckle is adjusted to be parallel to the opening, and the mode is convenient for replacing the first ribbon 131 and the second ribbon 132; the 2 small fixing plugs 181 and the 2 second grooves 204 are also connected and fixed together through wedges, the shape memory alloy strip 150 bypasses the first round shaft 104 and the second round shaft, then both ends of the shape memory alloy strip 150 bypass the third round shaft 170 and are fixed between the small fixing plugs 181 and the second grooves 204, and the shape memory alloy strip 150 is fixed between the small fixing plugs 181 and the turntable 6 through friction force.
The working process of the safety belt buffer device based on the shape memory alloy provided by the invention is as follows: when the vehicle brakes, the safety belt of the vehicle is tensioned, the pull rope 110 drives the sliding block 120 to slide upwards, and the first silk ribbon 131 and the second silk ribbon 132 drive the first rotary disc 142a and the second rotary disc 142b to move reversely, so that the shape memory alloy belt 150 is stretched, and the buffering and energy absorbing effects are achieved; after the braking of the vehicle is completed, the heating circuit board 160 heats the shape memory alloy strip 150, so that the shape memory alloy strip 150 quickly returns to the original length, and the elastic force of the springs 144 inside the first rotating disc 142a and the second rotating disc 142b also helps the first rotating disc 142a and the second rotating disc 142b to return to the original positions, so that the sliding blocks are driven to return to the original positions.
The safety belt buffer device based on the shape memory alloy provided by the invention further comprises: a vehicle speed sensor provided in a vehicle GPS for detecting a vehicle speed; a temperature sensor provided on the heating circuit board and connected to the shape memory alloy strip 150 for detecting a temperature of the shape memory alloy strip 150; a brake sensor disposed at a pedal reference point.
The safety belt buffer device based on the shape memory alloy can effectively relieve the constraint feeling of the safety belt to a driver during emergency braking, and avoid the reduction of the service life of the safety belt.
The invention also provides a control method of the safety belt buffer device based on the shape memory alloy, which comprises the following steps of:
step one, collecting the speed of a vehicle and the temperature of a shape memory alloy belt;
Step two, when the vehicle is started, the heating circuit board 160 preheats the shape memory alloy strip 150, and the preheating temperature is not more than 35 ℃;
Step three, when the vehicle runs:
① When the speed of the vehicle is 10-20km/h, the heating of the shape memory alloy belt 150 is stopped when the preheating temperature is reached, and when the temperature is reduced to 30 ℃, the heating circuit board 160 is heated again until reaching 35 ℃ again, so that the automobile can quickly reach the designated heating temperature after starting, and the service life of the shape memory alloy belt 150 can be reduced by reducing the sudden and large-scale heating;
② When the vehicle speed is 20-70km/h, the heating temperature of the heating circuit board 160 on the shape memory alloy belt 150 is in a quadratic function relation with the vehicle speed, the mathematical expression is T=0.01v 2 -0.4v+39, and the heating temperature is 35-60 ℃;
③ When the vehicle speed is 70-90km/h, the heating temperature of the heating circuit board 160 on the shape memory alloy belt 150 is in direct proportion to the vehicle speed, the mathematical expression is T=v-10, and the heating temperature is 60-80 ℃;
④ When the vehicle speed is 90-100km/h, the heating temperature of the heating circuit board 160 on the shape memory alloy belt 150 is in a quadratic function relation with the vehicle speed, the mathematical expression is T= -0.1v 2 +20v-910, and the heating temperature is 80-90 ℃;
⑤ At a vehicle speed of 100km/h and above, the heating circuit board 160 heats the shape memory alloy ribbon 150 to and maintains the temperature of 90 ℃.
As shown in fig. 11, the heating temperature of the shape memory alloy ribbon 150 is expressed in relation to the vehicle speed:
wherein T is the heating temperature of the shape memory alloy belt by the heating circuit board, and v is the speed of the vehicle;
and step four, heating the shape memory alloy belt to 90 ℃ by the heating circuit board after the braking of the vehicle is finished, and recovering the original length of the shape memory alloy belt.
The vehicle brake end time satisfies:
Fv＝0；
Where Fv is brake pedal pressure.
According to the control method of the safety belt buffer device based on the shape memory alloy, which is designed and developed by the invention, the running state of the vehicle is judged according to the running state parameters of the vehicle acquired by the sensor, and different heating modes are adopted for the shape memory alloy, so that the efficiency and the service life of the safety belt buffer device are improved.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown, it is well suited to various fields of use for which the invention is suited, and further modifications may be readily made by one skilled in the art, and the invention is therefore not to be limited to the particular details and examples shown and described herein, without departing from the general concepts defined by the claims and the equivalents thereof.
Claims (9)
1. A shape memory alloy based seat belt cushioning device comprising:
A first housing; and
A second housing detachably connected to the first housing and forming a first accommodation chamber having an open end;
One end of the first round shaft is fixed on the first shell, and the other end of the first round shaft is detachably arranged on the second shell;
A first rotating disc rotatably connected with the first shell, wherein the first rotating disc comprises a first sheave and a second sheave which are coaxially arranged;
The second rotary table comprises a third sheave and a fourth sheave which are coaxially arranged, the second rotary table is detachably and symmetrically connected with the first rotary table to form a second accommodating chamber, and the second rotary table is rotatably connected with the second shell;
One end of the shape memory alloy belt is detachably fixed on the second grooved pulley, and the other end of the shape memory alloy belt bypasses the first round shaft and is detachably fixed on the fourth grooved pulley;
a heating circuit board fixed in the first accommodating chamber and connected with the shape memory alloy strip;
a first ribbon one end of which is detachably fixed on the first sheave;
one end of the second silk ribbon is detachably fixed on the third grooved wheel;
The sliding block is slidably arranged in the first accommodating chamber and is connected with the other end of the first silk ribbon and the other end of the second silk ribbon;
one end of the pull rope is connected with the sliding block, and the other end of the pull rope penetrates through the opening end to be connected with a safety belt lock catch of the vehicle;
a vehicle speed sensor provided in a vehicle GPS;
the diameter of the first grooved wheel is larger than that of the second grooved wheel, the diameter of the third grooved wheel is larger than that of the fourth grooved wheel, and the first silk ribbon and the second silk ribbon can drive the first rotary table and the second rotary table to reversely rotate.
2. The shape memory alloy based seat belt cushioning device of claim 1, further comprising:
A shutter disposed in the first accommodation chamber for restricting a moving position of the slider;
One end of the second round shaft is fixed on the second shell, and the other end of the second round shaft is detachably arranged on the first shell;
Wherein the shape memory alloy ribbon bypasses the second circular axis;
And the third circular shaft is arranged on the baffle plate, and both ends of the shape memory alloy belt bypass the third circular shaft.
3. The shape memory alloy based seat belt cushioning device of claim 2, wherein each of said first, second, third and fourth sheaves has a polygonal groove circumscribed thereon.
4. A shape memory alloy based seat belt cushioning device as set forth in claim 3, further comprising:
And the first fixing plugs are detachably arranged in the polygonal grooves respectively and are used for fixing the first silk ribbon, the second silk ribbon and the shape memory alloy ribbon on the first turntable and the second turntable.
5. The shape memory alloy based seat belt cushioning device of claim 4, further comprising, within said second receiving chamber:
The connecting shaft passes through the first rotary table and the second rotary table in a rotatable mode respectively, and two ends of the connecting shaft are arranged on the first shell and the second shell;
And one end of the first spring is connected with the first rotating disc, and the other end of the first spring is connected with the second rotating disc.
6. The shape memory alloy based seat belt cushioning device according to claim 5, wherein said shape memory alloy ribbon is formed by uniformly arranging a plurality of Ti-Ni based shape memory alloy wires in a twist shape.
7. The shape memory alloy based seat belt cushioning device of claim 6, further comprising:
A temperature sensor disposed on the heating circuit board, and connected with the shape memory alloy strip;
a brake sensor disposed at a pedal reference point.
8. A control method of a shape memory alloy-based seat belt buffer device using the shape memory alloy-based seat belt buffer device according to any one of claims 1 to 7, characterized by comprising the steps of:
step one, collecting the speed of a vehicle and the temperature of a shape memory alloy belt;
Step two, when the vehicle is started, the heating circuit board preheats the shape memory alloy belt, and the preheating temperature is not more than 35 ℃;
step three, in the running process of the vehicle, the heating temperature of the heating circuit board on the shape memory alloy belt meets the following conditions:
wherein T is the heating temperature of the shape memory alloy belt by the heating circuit board, and v is the speed of the vehicle;
and step four, heating the shape memory alloy belt to 90 ℃ by the heating circuit board after the braking of the vehicle is finished, and recovering the original length of the shape memory alloy belt.
9. The method for controlling a shape memory alloy based seat belt cushioning according to claim 8, wherein said vehicle braking is terminated by:
Fv＝0；
Where Fv is brake pedal pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010645861.0A CN111619505B (en) | 2020-07-07 | 2020-07-07 | Safety belt buffer device based on shape memory alloy and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010645861.0A CN111619505B (en) | 2020-07-07 | 2020-07-07 | Safety belt buffer device based on shape memory alloy and control method thereof |
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| CN111619505A CN111619505A (en) | 2020-09-04 |
| CN111619505B true CN111619505B (en) | 2024-07-30 |
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| CN214523697U (en) * | 2021-03-22 | 2021-10-29 | 北京宝贝的旅程科技有限公司 | Binding belt and five-point safety belt |
| DE102022207667B4 (en) * | 2022-07-27 | 2024-07-11 | Zf Friedrichshafen Ag | Preheating a temperature element of a security system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN212267402U (en) * | 2020-07-07 | 2021-01-01 | 吉林大学 | Safety belt buffer device based on shape memory alloy |
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| DE102004048455B4 (en) * | 2004-10-05 | 2009-01-08 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Device and method for streamlining a safety belt for occupant protection in a vehicle |
| JP2007145053A (en) * | 2005-11-24 | 2007-06-14 | Takata Corp | Seat belt take-up device and seat belt take-up system |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212267402U (en) * | 2020-07-07 | 2021-01-01 | 吉林大学 | Safety belt buffer device based on shape memory alloy |
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