阅读说明：本技术 一种汽车座椅多级充气系统及其控制方法 (Automobile seat multistage inflation system and control method thereof ) 是由 沈传亮 徐孝东 高镇海 石博文 张山 郑成锋 于婧 安孝文 于 2021-03-19 设计创作，主要内容包括：本发明公开了一种汽车座椅多级充气系统及其控制方法,充气系统包括：气袋,其设置在汽车座椅中；多个气泵,其分别通过气管与气袋连通；基座；多个执行机构,其安装在基座上,并且与气泵一一对应设置；执行机构包括：定滑轮,其固定安装在基座上；驱动机体,其固定安装在基座上,并与定滑轮间隔设置；旋转阀芯,其一端通过柔性铰链连接在驱动机体上,另一端延伸至气管的进气口处；记忆合金丝,其一端固定连接在基座上,另一端缠绕驱动机体后,绕过定滑轮,并且固定连接在旋转阀芯上；记忆合金丝的两端分别连接电源；通过对记忆合金丝通断电改变其长度,能够带动旋转阀芯转动,使旋转阀芯封闭或打开气管的进气口。(The invention discloses a multistage inflation system for an automobile seat and a control method thereof, wherein the inflation system comprises: an air bag provided in the car seat; a plurality of air pumps which are respectively communicated with the air bags through air pipes; a base; the actuating mechanisms are arranged on the base and correspond to the air pumps one by one; the actuating mechanism includes: a fixed pulley fixedly mounted on the base; the driving machine body is fixedly arranged on the base and is arranged at intervals with the fixed pulley; one end of the rotary valve core is connected to the driving machine body through a flexible hinge, and the other end of the rotary valve core extends to the air inlet of the air pipe; one end of the memory alloy wire is fixedly connected to the base, and the other end of the memory alloy wire is wound around the driving machine body, bypasses the fixed pulley and is fixedly connected to the rotary valve core; two ends of the memory alloy wire are respectively connected with a power supply; the length of the memory alloy wire is changed by switching on and off the memory alloy wire, so that the rotary valve core can be driven to rotate, and the rotary valve core is enabled to seal or open the air inlet of the air pipe.)

1. A multi-level inflation system for a vehicle seat, comprising:

an air bag provided in the car seat;

a plurality of air pumps which are respectively communicated with the air bags through air pipes;

a base;

the actuating mechanisms are arranged on the base and correspond to the air pumps one by one;

wherein the actuator comprises:

a fixed pulley fixedly mounted on the base;

the driving machine body is fixedly arranged on the base and is arranged at intervals with the fixed pulley, and the driving base body is cylindrical;

one end of the rotary valve core is connected to the driving machine body through a flexible hinge, and the other end of the rotary valve core extends to the air inlet of the air pipe;

one end of the memory alloy wire is fixedly connected to the base, and the other end of the memory alloy wire is wound around the driving machine body, bypasses the fixed pulley and is fixedly connected to the rotary valve core;

wherein, two ends of the memory alloy wire are respectively connected with a power supply; the length of the memory alloy wire is changed by switching on and off the memory alloy wire, so that the rotary valve core can be driven to rotate, and the rotary valve core is enabled to close or open the air inlet of the air pipe.

2. The vehicle seat multiple stage inflation system of claim 1, further comprising:

a spring support fixedly mounted on the base;

a plurality of springs provided in one-to-one correspondence with the rotary valve elements; one end of the spring is connected to the spring support, and the other end of the spring is connected to the other end of the rotary valve core.

3. The multi-stage inflation system for the automobile seat according to claim 2, wherein a support block is integrated with the outer side of the air inlet of the air pipe;

when the rotary valve core closes the air inlet, the rotary valve core is abutted against the supporting block.

4. The multistage automobile seat inflation system as claimed in claim 3, wherein an alloy wire fixing seat is fixedly arranged on the base, and one end of the memory alloy wire is fixedly connected to the alloy wire fixing seat.

5. The multistage inflation system for the automobile seat according to claim 3 or 4, wherein a plurality of the driving bodies are coaxially arranged, and a plurality of the fixed pulleys are coaxially arranged; and the axis of the driving body and the axis of the fixed pulley are respectively perpendicular to the base.

6. The multistage inflation system for automobile seats of claim 5, wherein the number of the air pump and the actuator is 3 respectively.

7. A control method of a multistage inflation system for a vehicle seat, using the multistage inflation system for a vehicle seat according to claims 1 to 6, comprising the steps of:

step one, judging whether to inflate the air bag according to the current pressure and the target compressed air of the air bag;

wherein the airbag is inflated when P <0.9 Po;

p represents the current pressure of the air bag, Po represents the target pressure;

step two, when the air bag is judged to need to be inflated, the inflation time is determined;

and step three, judging the number of the air pumps and the actuating mechanisms to be started according to the inflation time, and starting the air pumps and the actuating mechanisms.

8. The control method of the multistage inflation system for the automobile seat according to claim 7, wherein in the third step, the memory alloy wire is heated to contract by electrifying the memory alloy wire, and the actuator is started;

wherein, the total length of the alloy wire in the martensite state in a single actuating mechanism is set as follows:

theta is more than or equal to 15 degrees;

wherein when alpha is_lim1≤α_gWhen the temperature of the water is higher than the set temperature,

when alpha is_lim1＞α_gWhen the temperature of the water is higher than the set temperature,

s₁＝E_a/E_ma，s_m＝E_mb/E_ma，Z＝σ_g/σ_o；

α_g＝min{[(-lnz)/f]<z＜1>，α_A}；

in the formula, alpha_lim1And alpha_lim2Is the angle position of the microcosmic force balance position of the alloy wire when electrified, f is the sliding friction coefficient between the alloy wire and the driving machine body, alpha is the differential unit of the alloy wire on the driving machine body, s₂Is a dimensionless parameter; e_aIs the elastic modulus of the alloy wire in the austenitic state, E_maIs the elastic modulus of the first stage in the martensitic state of the alloy wire, E_mbThe elastic modulus of the second stage of the alloy wire in a martensite state; sigma_gStress, σ, in the alloy wire at the intersection of the first and second martensite phases_oIs the initial stress in the linear shape memory alloy wire on the upper part of the flexible hinge before power-on, R is the radius of the driving machine body,<0≤α_g>is a Boolean operator; epsilon_M(σ₀) At an initial stress σ₀Memory alloy wire strain rate, epsilon under action_A(σ₁) Is the stress sigma in the austenitic state in the wire after energization₁Strain rate under action; alpha is alpha_gIs the filament angle before the martensite elastic threshold is exceeded; n is the number of turns of the winding wire on the driving machine body; r_rThe distance from the joint of the memory alloy wire and the rotary valve core to the thinnest position of the flexible hinge structure is obtained; and theta is the rotation angle of the rotary valve core.

9. The control method of a multistage inflation system for an automobile seat according to claim 8, wherein when the number of the air pumps and the actuators is 3, respectively;

if T is less than or equal to 1s, starting 1 air pump and 1 actuating mechanism to inflate the air bag;

if T is more than 1s and less than or equal to 2s, starting 2 air pumps and 2 actuating mechanisms to inflate the air bag;

if T is more than 2s, starting 3 air pumps and 3 actuating mechanisms to inflate the air bag;

and T is the inflation time, the pressure of the air bag is monitored in real time in the inflation process, the inflation time is updated, and the number of the air pumps and the number of the actuating mechanisms are switched to be started according to the updated inflation time.

10. The method of controlling a multistage inflation system for an automobile seat according to claim 9, wherein inflation of the airbag is stopped when the pressure of the airbag reaches 0.9 to 1.1 times the target pressure.

Technical Field

The invention belongs to the technical field of intelligent cabins and intelligent and light-weighted bodies of automobiles, and particularly relates to an automobile seat multistage inflation system and a control method thereof.

Background

With the development of automotive technology, automotive seats have evolved from a simple component to a more complex and more demanding precision component. The function of the car seat is gradually extended, and the car seat is not only limited to providing a good driving and sitting posture. On high-grade cars, designers are endowed with functions of massage and ventilation of automobile seats so as to meet the increasing demands of consumers.

Most of the traditional automobile seats are passive components needing traction of users, or components which change the sitting postures of the users along with manual adjustment of passengers and are not intelligent, and the intelligent automobile seat does not relate to the intelligent field of intelligent cabins and intelligent automobile bodies. In recent years, designers realize the massage function under any condition through an automobile seat massage system consisting of an air bag, a switch valve and an air pump, and the man-machine interaction function between a seat and a user is greatly improved. However, the switch valve in the existing automobile seat massage system is mostly an electromagnetic valve, the motor drives the switch valve to open and close, the structure is complex, the noise is large in the using process, the switch valve is mostly a single distributed driving form, and the more electromagnetic valves are distributed on the seat to greatly increase the complexity of the seat structure.

Disclosure of Invention

The invention aims to provide a multi-stage inflation system for an automobile seat, which is provided with an inflation actuating mechanism for opening or closing based on a memory alloy wire, has a simple structure, can realize silent opening and closing, and overcomes the defects of high noise, complex structure and high manufacturing difficulty of the existing switch valve of the seat inflation system.

The invention also aims to provide a multi-stage inflation system for the automobile seat and a control method thereof, which can determine the number of opening actuating mechanisms according to the real-time air pressure of an air bag to realize the gradient adjustment of the inflation quantity; therefore, the inflation time is effectively shortened when a large amount of inflation is needed, and the over-high instantaneous pressure of the air bag is avoided when a small amount of inflation is needed.

The technical scheme provided by the invention is as follows:

a multi-level inflation system for a vehicle seat, comprising:

an air bag provided in the car seat;

a plurality of air pumps which are respectively communicated with the air bags through air pipes;

a base;

the actuating mechanisms are arranged on the base and correspond to the air pumps one by one;

wherein the actuator comprises:

a fixed pulley fixedly mounted on the base;

the driving machine body is fixedly arranged on the base and is arranged at intervals with the fixed pulley, and the driving base body is cylindrical;

one end of the rotary valve core is connected to the driving machine body through a flexible hinge, and the other end of the rotary valve core extends to the air inlet of the air pipe;

one end of the memory alloy wire is fixedly connected to the base, and the other end of the memory alloy wire is wound around the driving machine body, bypasses the fixed pulley and is fixedly connected to the rotary valve core;

wherein, two ends of the memory alloy wire are respectively connected with a power supply; the length of the memory alloy wire is changed by switching on and off the memory alloy wire, so that the rotary valve core can be driven to rotate, and the rotary valve core is enabled to close or open the air inlet of the air pipe.

Preferably, the multistage inflation system for a vehicle seat further comprises:

a spring support fixedly mounted on the base;

a plurality of springs provided in one-to-one correspondence with the rotary valve elements; one end of the spring is connected to the spring support, and the other end of the spring is connected to the other end of the rotary valve core.

Preferably, a support block is integrated on the outer side of the air inlet of the air pipe;

when the rotary valve core closes the air inlet, the rotary valve core is abutted against the supporting block.

Preferably, an alloy wire fixing seat is fixedly arranged on the base, and one end of the memory alloy wire is fixedly connected to the alloy wire fixing seat.

Preferably, the plurality of driving bodies are coaxially arranged, and the plurality of fixed pulleys are coaxially arranged; and the axis of the driving body and the axis of the fixed pulley are respectively perpendicular to the base.

Preferably, the number of the air pumps and the number of the actuators are 3 respectively.

A control method of a multistage inflation system for an automobile seat comprises the following steps:

step one, judging whether to inflate the air bag according to the current pressure and the target compressed air of the air bag;

wherein the airbag is inflated when P <0.9 Po;

p represents the current pressure of the air bag, Po represents the target pressure;

step two, when the air bag is judged to need to be inflated, the inflation time is determined;

and step three, judging the number of the air pumps and the actuating mechanisms to be started according to the inflation time, and starting the air pumps and the actuating mechanisms.

Preferably, in the third step, the memory alloy wire is heated to contract by electrifying the memory alloy wire, and the actuating mechanism is started;

wherein, the total length of the alloy wire in the martensite state in a single actuating mechanism is set as follows:

theta is more than or equal to 15 degrees;

wherein when alpha is_lim1≤α_gWhen the temperature of the water is higher than the set temperature,

when alpha is_lim1＞α_gWhen the temperature of the water is higher than the set temperature,

s₁＝E_a/E_ma，s_m＝E_mb/E_ma，Z＝σ_g/σ_o；

α_g＝min{[(-lnz)/f]<z＜1>，α_A}；

in the formula, alpha_lim1And alpha_lim2Is the angle position of the microcosmic force balance position of the alloy wire when electrified, f is the sliding friction coefficient between the alloy wire and the driving machine body, alpha is the differential unit of the alloy wire on the driving machine body, s₂Is a dimensionless parameter; e_aIs the elastic modulus of the alloy wire in the austenitic state, E_maIs the elastic modulus of the first stage in the martensitic state of the alloy wire, E_mbThe elastic modulus of the second stage of the alloy wire in a martensite state; sigma_gStress, σ, in the alloy wire at the intersection of the first and second martensite phases_oIs the initial stress in the linear shape memory alloy wire on the upper part of the flexible hinge before power-on, R is the radius of the driving machine body,<0≤α_g>is a Boolean operator; epsilon_M(σ₀) At an initial stress σ₀Memory alloy wire strain rate, epsilon under action_A(σ₁) Is the stress sigma in the austenitic state in the wire after energization₁Strain rate under action; alpha is alpha_gIs the filament angle before the martensite elastic threshold is exceeded; n is the number of turns of the winding wire on the driving machine body; r_rThe distance from the joint of the memory alloy wire and the rotary valve core to the thinnest position of the flexible hinge structure is obtained; and theta is the rotation angle of the rotary valve core.

Preferably, when the number of the air pump and the actuator is 3 respectively;

if T is less than or equal to 1s, starting 1 air pump and 1 actuating mechanism to inflate the air bag;

if T is more than 1s and less than or equal to 2s, starting 2 air pumps and 2 actuating mechanisms to inflate the air bag;

if T is more than 2s, starting 3 air pumps and 3 actuating mechanisms to inflate the air bag;

and T is the inflation time, the pressure of the air bag is monitored in real time in the inflation process, the inflation time is updated, and the number of the air pumps and the number of the actuating mechanisms are switched to be started according to the updated inflation time.

Preferably, when the pressure of the airbag reaches 0.9 to 1.1 times of the target pressure, the inflation of the airbag is stopped.

The invention has the beneficial effects that:

the automobile seat multistage inflation system provided by the invention is provided with the inflation actuating mechanism which is opened or closed based on the memory alloy wire, has a simple structure, can realize silent opening and closing, and overcomes the defects of high noise, complex structure and high manufacturing difficulty of the existing seat inflation system switch valve.

The control method of the automobile seat multistage inflation system provided by the invention can determine the number of the opening actuating mechanisms according to the real-time air pressure of the air bag, and realize the gradient adjustment of the inflation quantity; therefore, the inflation time is effectively shortened when a large amount of inflation is needed, and the over-high instantaneous pressure of the air bag is avoided when a small amount of inflation is needed.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the actuator according to the present invention.

Fig. 2 is a front view of the actuator of the present invention.

Fig. 3 is a flowchart of a control method in an embodiment of the present invention.

Fig. 4 is a simplified schematic diagram of the actuators when 1 actuator is engaged in the inflation system.

FIG. 5 is a simplified schematic diagram of the actuators when 2 actuators are engaged in the inflation system.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

The invention provides a multistage inflation system for an automobile seat, which comprises: air pocket, a plurality of air pump and a plurality of actuating mechanism.

An air bag is provided in a vehicle seat, and the seat profile is changed by filling or discharging air; the air pumps are respectively communicated with the air bags through air pipes; the actuating mechanisms are arranged in one-to-one correspondence with the air pumps, and can be used for switching on or off external air flow entering the air pipe by opening or closing an air inlet of the air pipe (communicated with the air pumps).

As shown in fig. 1-2, the plurality of actuators are mounted on a base 100. The actuator includes:

a fixed pulley 110 fixedly mounted on the base 100 via a fixed pulley mounting support 111; a driving body 120 fixedly installed on the base 100, the driving body 120 having a cylindrical shape and spaced apart from the fixed pulley 110; a rotary valve core 130, one end of which is connected to the outer circumference of the driving body 120 by a flexible hinge 150, and the other end of which extends to the air inlet of the corresponding air pipe 210; one end of the memory alloy wire 140 is fixedly connected to the base 100, and the other end is spirally wound around the driving body 120, passes around the fixed pulley 110, and is fixedly connected to the rotary valve core 130.

In this embodiment, the base 100 is fixedly provided with an alloy wire fixing seat 101, and one end of the memory alloy wire 140 is fixedly connected to the alloy wire fixing seat 101.

Wherein, two ends of the memory alloy wire 140 are respectively connected with a power supply and a switch (not shown in the figure); the length of the memory alloy wire 140 is changed by switching on or off the memory alloy wire, so that the rotary valve core 140 can be driven to rotate, and the rotary valve core 130 closes (blocks) or opens (leaves) the air inlet of the air pipe 210.

The material 140 of the memory alloy wire is preferably a nickel titanium based shape memory material, but may also comprise other materials whose shape can be changed by temperature control, such as Au-Cd, Cu-Zn-A1, Cu-Zn-Sn, Ni-Ti-Pd, etc.

The flexible hinge adopts the design of straight circular unipolar flexible hinge structure, and the atress rotation angle size is:

wherein θ is a rotation angle of the flexible hinge (equivalent to the rotation angle of the rotary valve core 130), M is a moment applied to the flexible hinge structure, H is a radius of an arc portion of the straight circular uniaxial flexible hinge, E is an elastic modulus of a material used for the flexible hinge, T is a width of the flexible hinge, T is a thickness of the thinnest portion of the flexible hinge, and μ is an angle differential unit of the arc portion of the straight circular uniaxial flexible hinge in a polar coordinate system.

The multistage inflation system of car seat still includes: a spring support 102 fixedly mounted on the base 100; and a plurality of springs 160 provided in one-to-one correspondence with the rotary spools 130; one end of the spring 160 is connected to the spring holder 102 and the other end is connected to the other end of the rotary spool 130. Wherein, a supporting block 211 is integrated at the outer side of the air inlet of the air pipe 210; when the rotary valve core 130 closes the air inlet of the air pipe 210, the lower side surface of the rotary valve core 130 abuts on the supporting block 211. The rotary valve body 130 can be pressed against the support block 211 by providing the spring 160, thereby improving the sealing property. Meanwhile, after the inflation process is finished, after the memory alloy wire 140 is powered off and is increased, the rotary valve core 130 can quickly return to the air inlet of the air pipe 210 through the restoring force action of the spring 160, and the air inlet is closed.

In the present embodiment, to reduce the space occupied by the actuator, a plurality of driving bodies 120 are coaxially disposed, and a plurality of fixed pulleys 110 are coaxially disposed; and the axis of the driving body 120 and the axis of the fixed pulley 110 are perpendicular to the base 100, respectively. The plurality of rotary spools 140 are respectively arrayed in a direction perpendicular to the base 100.

In this embodiment, the number of the air pump and the number of the actuator are 3 respectively.

In another embodiment, the multistage inflation system for a vehicle seat further comprises: the instruction perception module is used for acquiring an inflation instruction of a seat user and current pressure information of an air bag and outputting the acquired information; and the inflation time calculation module is used for receiving the state information and performing classification judgment to obtain inflation time, and when the inflation system starts to be accessed to work, the time when the current pressure of the air bag reaches the target pressure when the single inflation execution unit is accessed is considered according to the difference value between the current pressure of the air bag and the target pressure, so that the initial inflation time is obtained. Then, the number of inflation execution units needing to be accessed into the system is judged according to the grade judgment unit, along with the increase of the pressure of the air bag in the inflation process, the inflation time calculation module continuously considers the time reaching the target pressure when the single execution unit is currently accessed, and the number of the inflation execution units accessed into the inflation passage is dynamically adjusted according to the recalculated time; and the grade judging unit is used for judging the grade of the inflation time and dynamically adjusting the quantity of the inflation actuating mechanisms and the air pumps which are connected into the system.

Also included is a deflation system for deflating the air bag.

The invention also provides a control method of the automobile seat multistage inflation system, which comprises the following steps:

step one, judging whether to inflate the air bag according to the current pressure and the target compressed air of the air bag;

wherein the airbag is inflated when P <0.9 Po;

p represents the current pressure of the air bag, Po represents the target pressure;

step two, when the air bag is judged to need to be inflated, the inflation time is determined;

and step three, judging the number of the air pumps and the actuating mechanisms to be started according to the inflation time.

In the third step, the memory alloy wire is electrified to be heated and contracted, and the actuating mechanism is started;

wherein the length of the contraction actuation of the memory alloy wire is as follows: l ═ L₁+L₂；

When alpha is_lim1≤α_gWhen the temperature of the water is higher than the set temperature,

when alpha is_lim1＞α_gWhen the temperature of the water is higher than the set temperature,

s₁＝E_a/E_ma，sm＝E_mb/E_ma，Z＝σ_g/σ_o；

L₂＝L_free[ε_M(σ₀)-ε_A(σ₁)]；

α_g＝min{[(-lnz)/f]<z＜1>，α_A}；

in the formula, alpha_lim1And alpha_lim2Is the angle position of the microcosmic force balance position of the alloy wire when electrified, f is the sliding friction coefficient between the alloy wire and the driving machine body, alpha is the differential unit of the alloy wire on the driving machine body, s₂Is a dimensionless parameter; e_aIs the elastic modulus of the alloy wire in the austenitic state, E_maIs the elastic modulus of the first stage in the martensitic state of the alloy wire, E_mbThe elastic modulus of the second stage of the alloy wire in a martensite state; sigma_gStress, σ, in the alloy wire at the intersection of the first and second martensite phases_oIs the initial stress in the linear shape memory alloy wire on the upper part of the flexible hinge before power-on, R is the radius of the driving machine body,<0≤α_g>is a Boolean operator; the alloy wire in a single actuator is divided into a wound wire wound on a cylinder and a straight wire except for the wound wire portion, L_freeIs the linear filament length in the martensitic state, epsilon_M(σ₀) At an initial stress σ₀Memory alloy wire strain rate, epsilon under action_A(σ₁) Is the stress sigma in the austenitic state in the wire after energization₁Strain rate under influence. Alpha is alpha_gDefined as the filament angle, alpha, before the martensite elastic threshold is exceeded_gLess than the total winding angle alpha of the wire around the drive body_A(ii) a n is the number of turns of the winding wire on the driving machine body, and n is defined as 2 or 3; r_rThe distance from the joint of the memory alloy wire and the rotary valve core to the thinnest position of the flexible hinge structure is obtained; theta is the rotation angle of the rotary valve core, theta is defined to exceed more than 15 degrees, and a single inflation actuating mechanism is opened; l is_tThe total length of the alloy wire in a martensite state (at room temperature) in a single actuator. After the value of theta is determined according to the actual situation, the value of theta can be substituted into a formula to determine L_tThe length of the memory alloy wire is determined, so that the actuator can be normally opened.

More preferably, when the pressure of the airbag reaches 0.9 to 1.1 times the target pressure, the inflation of the airbag is stopped.

The control method provided by the present invention is further described below with reference to specific examples.

Examples

As shown in fig. 3 to 5, in the present embodiment, the number of the air pump and the actuator is 3 respectively. The specific control method comprises the following steps:

and comparing the current air pressure P with the target pressure Po, judging whether the current air bag pressure P is between 0.9 and 1.1 times of the target pressure Po, if so, not opening the air pump and the actuating mechanism, and if not, opening the air pump and the actuating mechanism.

a. If the current air bag pressure P is less than 0.9Po, an inflation working condition classifying unit in the inflation time calculating module classifies the current air bag pressure, and the time T of the inflation to reach the target air bag pressure is calculated through the inflation working condition time calculating unit.

If T is less than or equal to 1s, switching on 1 inflation actuating mechanism and 1 air pump on the basis of considering system delay; when 1 inflation actuating mechanism is switched on, the actuating mechanism is simplified into a mechanism shown in figure 4; after the current pressure P of the air bag is updated, transmitting the pressure P to an air bag current pressure P establishing unit, realizing circulation until the current air bag pressure P reaches 0.9-1.1 times of the target pressure Po, and closing the air pump and the actuating mechanism;

if T is more than 1s and less than or equal to 2s, on the basis of considering system delay, 2 inflation actuating mechanisms and 2 air pumps are switched on, and the inflation speed is accelerated; when 2 inflation actuators are switched on, the actuators are simplified into the mechanism shown in fig. 5; after the current pressure P of the air bag is updated, whether the T of the next cycle is between 1s and less than T <2s is judged, if yes, 2 inflation execution mechanisms continue to work, if not, 1 inflation execution mechanism is switched on to work, the cycle is realized until the current pressure P of the air bag reaches 0.9-1.1 times of the target pressure Po, and the air pump and the novel shape memory alloy valve are closed;

if T is greater than 2s, on the basis of considering system delay, connecting 3 inflation actuating mechanisms and 3 air pumps, further accelerating the inflation speed, judging whether the T of the next cycle is between T and 2s after updating the current pressure P of the air bag, if so, continuing to work by the 3 inflation actuating mechanisms, and if not, judging the interval of the T at the moment. If T is less than or equal to 1s, 1 inflation execution working unit is switched on, the current pressure P of the air bag is transmitted to the current pressure P building unit of the air bag after being updated, the circulation is realized until the current pressure P of the air bag reaches 0.9-1.1 times of the target pressure Po, the air pump and the novel shape memory alloy valve are closed, and the system stops working; if T is more than 1s and less than or equal to 2s, 2 inflation executing mechanisms are switched on, after the current pressure P of the air bag is updated, whether T of the next cycle is within 1s and less than T and less than 2s is judged, if the T of the next cycle is within 1s and less than T and less than 2s, the second-stage inflation executing mechanism continues to work, if the T of the next cycle is not within 1s and less than T, the 1 inflation executing mechanism is switched on to work, the cycle is realized until the current pressure P of the air bag reaches 0.9-1.1 times of the target pressure Po.

b. If the current air bag pressure P is more than 1.1Po, the air discharging system works, on the basis of considering the system delay, the air discharging actuating mechanism is connected, and when the air bag pressure is updated to be 0.9-1.1 times of the target pressure Po, the air discharging system stops working.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.