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A pre-collision device and control method with adjustable positive and negative Poisson's ratio

A technology of negative Poisson's ratio and Poisson's ratio, applied in the field of pre-collision device and control with adjustable positive and negative Poisson's ratio, can solve the problems of pedestrian injury, change of structural stiffness, slow response speed, etc., to reduce loss, reduce damage effect

Active Publication Date: 2022-07-12
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the system uses electrothermal methods to change the structural stiffness, and the response speed is relatively slow. If the traditional anti-collision beam with a certain movement speed cannot reduce the stiffness, it can still cause great harm to pedestrians.

Method used

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  • A pre-collision device and control method with adjustable positive and negative Poisson's ratio
  • A pre-collision device and control method with adjustable positive and negative Poisson's ratio
  • A pre-collision device and control method with adjustable positive and negative Poisson's ratio

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] see figure 1 Shown: A pre-collision device with adjustable positive and negative Poisson's ratio, including a vehicle-mounted collision structure, a bionic microstructure action controller, a CAN vehicle-mounted network, a target motion state sensor, a collision pre-judgment unit, and a collision target. Type judgment unit, collision monitoring unit, collision pre-control unit.

[0048] see Figure 2 to Figure 7 Shown: The vehicle crash structure adopts a sandwich structure design, including an outer cover and an inner core material. The outer cover is made of soft and ductile material, and the outer cover is used to wrap and fix the inner core material; the inner core material is a polycellular with variable positive and negative Poisson's ratio. structure;

[0049] The multi-cellular structure of the internal core material is a three-dimensional structure composed of multiple unit cells arranged in sequence in the X, Y, and Z directions; the unit cell structure is a...

Embodiment 2

[0058] Determining whether an unavoidable collision has occurred

[0059] Determine whether the collision between the vehicle and the obstacle is unavoidable through the collision prediction unit;

[0060] The calculation method of the braking distance S of the vehicle is:

[0061]

[0062] The calculation method of the braking time t of the vehicle is:

[0063]

[0064] The calculation method of the relative distance L between the vehicle and the obstacle ahead after time t is:

[0065] L=L 0 +t(u r +u a0 )

[0066] In the above expression, τ′ 1 +τ″ 1 is the driver's reaction time, τ' 2 Time required for braking to work, τ″ 2 is the braking force increase time, u a0 is the starting braking speed, a bmax is the maximum braking deceleration, the above parameters are obtained through the CAN vehicle network; L 0 and u r are the relative distance and relative speed of the front obstacle and the vehicle detected by the target motion state sensor, respectively. ...

Embodiment 3

[0071] see Figure 10 , the calculation and derivation method of the winding electromagnetic field force of a single set of winding coils

[0072] Calculate the magnetomotive force: E=IN

[0073] Number of turns:

[0074]

[0075] Among them: L is the winding width; D2 is the outer diameter of the winding; D1 is the inner diameter of the winding; d is the diameter of the enameled wire;

[0076] Winding length:

[0077]

[0078] According to the resistance formula:

[0079]

[0080] Where: ρ is the resistivity of the winding;

[0081] according to:

[0082]

[0083] So the magnetomotive force:

[0084]

[0085] Electromagnetic induction strength:

[0086] IN=∑(HL)

[0087] Among them: H is the magnetic field strength; L is the length of the magnetic medium;

[0088] In general, except for the air gap, the other parts of the solenoid valve are made of materials with good magnetic permeability, and most of the magnetomotive force drop is at the air gap, th...

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Abstract

The present invention provides a pre-collision device with adjustable positive and negative Poisson's ratio. A bionic microstructure motion controller with a material structure, a CAN vehicle network for obtaining the running information of the vehicle, a target motion state sensor for detecting the running information of obstacles, a collision target type judgment unit for judging the type of obstacles, and a receiving CAN In-vehicle network data, receive target motion state sensor data, obstacle type, and determine whether the collision between the vehicle and the obstacle is unavoidable, and the collision prediction unit monitors whether the vehicle and the obstacle are in contact in real time, and transmits the detection results in real time The collision monitoring unit for the collision pre-control unit; when the obstacle is a living body or a non-living body, use the collision pre-control unit to control the bionic microstructure action controller to switch the internal core material to a negative Poisson's ratio structure or a positive Poisson's ratio structure.

Description

technical field [0001] The invention belongs to the field of traffic safety, and in particular relates to a pre-collision device and a control method with adjustable positive and negative Poisson's ratio. Background technique [0002] With the rapid increase in the number of cars in our country, the road traffic environment is becoming more and more congested, and traffic accidents are becoming more and more frequent. At the same time, from the perspective of relevant laws and regulations, the country's requirements for energy conservation and emission reduction of automobiles are becoming more and more stringent. Therefore, automobile R&D units have gradually increased the design of lightweight vehicles. Although the above problems of energy conservation and emission reduction of automobiles have been solved, due to the overall The lightweight design of the car leads to the lack of the collision energy absorption performance of the car anti-collision beam and the protection...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60R19/03B60R19/34B60R21/01B60R21/0134B60R21/34B60R19/00B60R19/18B60R21/00
CPCB60R19/03B60R19/34B60R21/34B60R21/01B60R21/0134B60R2019/007B60R2019/186B60R2021/343B60R2021/0027B60R2021/01013B60R2021/01081Y02T90/00
Inventor 马芳武刘百川梁鸿宇薛桂连蒲永锋王晨
Owner JILIN UNIV