A sensor

Abstract

The present invention provides a sensor, comprising two stress sensing teeth connected vertically to each other, wherein the overlapping portion of the two stress sensing teeth is provided with a strain gauge that extends or contracts synchronously with the stress sensing teeth, wherein the strain gauge comprises: two horizontal force strain gauges extending in the horizontal direction, and two vertical force strain gauges perpendicular to each other and provided between the two horizontal force strain gauges. Through the horizontal force strain gauge and the vertical force strain gauge, the numerical magnitude of the horizontal force (braking force) and the shear force (load) acting on the sensor can be measured.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and in particular to a sensor for measuring force (horizontal force) during braking of a motor vehicle. Background Art

[0002] When a motor vehicle is in motion, it is often necessary to brake it. The force applied by the vehicle brake to the motor vehicle is divided into braking force and side slip force. The magnitude of the braking force determines the length of the braking time of the motor vehicle. If the braking force is too small, the braking time of the motor vehicle will be too long. At this time, there may be a risk of collision with other motor vehicles, which seriously affects the normal passage of vehicles on the road. At the same time, due to mechanical errors in the locking process of the two or four driving wheels of the motor vehicle, there may be inconsistent braking between the wheels. At this time, the motor vehicle will generate a side slip force at a certain angle to the formation direction. During the driving process of the motor vehicle, once the side slip force of the motor vehicle is too large, it will cause the motor vehicle to deviate, collide or scrape with the motor vehicle in the adjacent lane, causing a traffic accident.

[0003] like Figure 1 As shown, a moving car is stopped on a detection plate in a fixed area to detect the gravity (z direction) of the car measured in the vertical direction and the braking force (x direction) measured in the horizontal direction.

[0004] In the prior art, during the braking process of a car, the braking force and gravity are related to each other, but the prior art can only measure these two forces separately and cannot obtain the correlation between the two. Therefore, it is necessary to develop a sensor that can measure these two forces at the same time. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the sensor in the prior art cannot measure the braking force and gravity of the motor vehicle at the same time.

[0006] To this end, the present invention provides a sensor, comprising: two stress sensing teeth connected vertically to each other, wherein a strain gauge that extends or contracts synchronously with the stress sensing teeth is arranged at the overlapping portion of the two stress sensing teeth, and the strain gauge comprises: two horizontal force strain gauges extending in the horizontal direction; and two vertical force strain gauges perpendicular to each other, arranged between the two horizontal force strain gauges.

[0007] The angle between any one of the two vertical force strain gauges and the horizontal line is 45° or 135°.

[0008] The stress induction tooth is provided with a connecting hole through which a connecting member can pass.

[0009] The inner wall of the connecting hole is provided with an internal thread.

[0010] The horizontal force strain gauge and the vertical force strain gauge are welded on the stress sensing tooth.

[0011] A stress sensing tooth groove is arranged on a side of the stress sensing tooth away from the strain gauge.

[0012] The technical solution of the present invention has the following advantages:

[0013] 1. The sensor provided by the present invention comprises two stress sensing teeth connected vertically to each other, and a strain gauge which extends or contracts synchronously with the stress sensing teeth is arranged at the overlapping portion of the two stress sensing teeth, and the strain gauge comprises: two horizontal force strain gauges extending in the horizontal direction, and two vertical force strain gauges which are perpendicular to each other and arranged between the two horizontal force strain gauges.

[0014] In the present invention, the sensor provided by the present invention is applied to a stress-bearing beam. When a motor vehicle is running on the stress-bearing beam, the horizontal force strain gauge can measure the magnitude of the horizontal force parallel to the direction of the stress-bearing beam. When the vehicle is started or braked, the acceleration of the vehicle is not zero, and the vehicle is in a non-uniform speed state. The horizontal force acts on the stress-bearing beam and acts on two horizontal force strain gauges according to the direction to generate a tensile stress and a compressive stress. The two detected signal polarities are exchanged and linked, so that the tensile and compressive stresses are superimposed to obtain the horizontal force (braking force) acting on the stress-bearing beam.

[0015] The vertical force strain gauge is used to measure the vertical force. The vertical force strain gauges are perpendicular to each other and are set at an angle of 45 degrees or 135 degrees. The sensor provided by the present invention is applied to the load-bearing beam. When the load-bearing beam is subjected to a downward load, the two adjacent load-bearing units inside the load-bearing beam will be subjected to shear force. From the perspective of force analysis, it can be known that the direction of the shear force is along the direction of 45 degrees or 135 degrees. The vertical force (load) acts on the area between the two vertical force strain gauges on the load-bearing beam, and shear force is generated at the positions of the two vertical force strain gauges. The sum of the two shear forces is the vertical force (load) acting between the two sensors. At this time, the value detected by the two vertical force strain gauges is the size of the load on the load-bearing beam.

[0016] During vehicle braking or acceleration, horizontal force will be generated between the tires and the road surface. At the same time, the center of gravity of the vehicle will move forward or backward due to inertia, which will affect the detection of the vehicle wheel load.

[0017] By testing the horizontal force and the load value, the degree of vehicle braking or acceleration can be determined, thereby correcting the error in vehicle load detection caused by braking. This reduces the error caused by irregular driving of the vehicle in the detection area. At the same time, the vehicle's braking performance can be tested, such as the size of the braking force, the imbalance of the braking force on the left and right, and the braking sequence of the front and rear axles or axle groups. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the directions of the braking force and gravity indicated in the background technology of the present invention;

[0020] Figure 2 A schematic diagram of the structure of the sensor provided by the present invention;

[0021] Figure 3 This is a schematic structural diagram of the vertical force sensor provided by the present invention.

[0022] Description of reference numerals:

[0023] 1-stress sensing tooth; 11-connection hole; 2-horizontal force strain gauge; 3-vertical force strain gauge. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Example

[0029] This embodiment provides a sensor such as Figure 2 As shown, it includes: two stress sensing teeth 1 connected vertically to each other, and the overlapping parts of the two stress sensing teeth are provided with strain gauges that extend or contract synchronously with the stress sensing teeth, and the strain gauges include: horizontal force strain gauges 2, which are two and extend in the horizontal direction; two vertical force strain gauges 3 that are perpendicular to each other and are arranged between the two horizontal force strain gauges.

[0030] The sensor provided in this embodiment is mainly used on a horizontal stress beam, which is set on the ground as a kind of weighing platform. The sensor can measure the braking force of a motor vehicle passing through the horizontal stress beam and the load of the motor vehicle itself.

[0031] In this embodiment, a stress sensing tooth groove is provided on a side of the stress sensing tooth away from the strain gauge.

[0032] In this embodiment, the angle between any one of the two vertical force strain gauges and the horizontal line is 45° or 135°. From the perspective of force analysis, it can be seen that the direction of the shear force is along the direction of 45 degrees or 135 degrees. By setting the vertical force strain gauge to 45 degrees or 135 degrees, the magnitude of the load acting on it can be calculated more accurately.

[0033] In this embodiment, Figure 3 As shown, the angle α between the first vertical force strain gauge 3131 and the horizontal is 45 degrees, and correspondingly, the angle between the second vertical force strain gauge 32 and the horizontal is 135 degrees.

[0034] In this embodiment, the stress sensing teeth are provided with connection holes 11 through which the connection members can pass. By providing the connection holes, the sensor can be connected to a beam body such as a stress beam.

[0035] Specifically, the connection hole may be a through hole, or an internal thread may be provided on the inner wall. When the sensor and the force-bearing beam need to be connected as one, the force-bearing beam and the sensor are connected by screws through threaded connection.

[0036] In this embodiment, the horizontal force strain gauge and the vertical force strain gauge are welded on the stress sensing tooth. Meanwhile, the horizontal force strain gauge and the vertical force strain gauge are both connected with wires, and the signals generated by the strain gauges are derived through guides.

[0037] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A sensor, characterized in that: include: Two stress sensing teeth are vertically connected to each other, and a strain gauge that extends or contracts synchronously with the stress sensing teeth is provided at the overlapping portion of the two stress sensing teeth. The strain gauge includes: There are two horizontal force strain gauges, which are extended in the horizontal direction; Two vertical force strain gauges perpendicular to each other are arranged between the two horizontal force strain gauges; The angle between any one of the two vertical force strain gauges and the horizontal line is 45° or 135°; Applied to the stress beam, when a motor vehicle is running on the stress beam, the horizontal force strain gauge can measure the magnitude of the horizontal force parallel to the stress beam. When the vehicle starts or brakes, the acceleration of the vehicle is not zero, and the vehicle is in a non-uniform state. The horizontal force acts on the stress beam. According to the direction, it acts on two horizontal force strain gauges to generate a tensile stress and a compressive stress. By exchanging the polarity of the two detected signals and linking them, the tensile and compressive stresses are superimposed to obtain the horizontal force acting on the stress beam. When the load beam is subjected to downward load, the two adjacent load units inside the load beam will be subjected to shear force; The vertical force acts on the area between the two vertical force strain gauges on the load-bearing beam, generating shear force at the positions of the two vertical force strain gauges. The sum of the two shear forces is the vertical force acting between the two sensors. At this time, the values ​​detected by the two vertical force strain gauges are the magnitude of the load on the load-bearing beam. By detecting the horizontal force and the load value, the degree of vehicle braking or acceleration can be determined, thereby correcting the error in vehicle load detection caused by braking.

2. The sensor according to claim 1, characterized in that The stress induction tooth is provided with a connecting hole through which a connecting member can pass.

3. The sensor according to claim 2, characterized in that The inner wall of the connecting hole is provided with an internal thread.

4. The sensor according to claim 3, characterized in that The horizontal force strain gauge and the vertical force strain gauge are welded on the stress sensing tooth.

5. The sensor according to claim 4, characterized in that A stress sensing tooth groove is arranged on a side of the stress sensing tooth away from the strain gauge.

6. The sensor according to claim 5, characterized in that The strain gauge is connected with a wire for deriving the signal generated by the deformation of the strain gauge.

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