CN113184051A

CN113184051A - Intelligent steering rear wheel steering position sensor

Info

Publication number: CN113184051A
Application number: CN202110654256.4A
Authority: CN
Inventors: 叶国威
Original assignee: Zhejiang Woder Technology Group Co ltd
Current assignee: Zhejiang Woder Technology Group Co ltd
Priority date: 2021-06-11
Filing date: 2021-06-11
Publication date: 2021-07-30

Abstract

The present invention relates to a sensor structure. A movable shaft is arranged in a shell, a movable structure is arranged on the movable shaft, a guide structure is arranged on the shell, the guide structure is matched with the movable structure, and a sensor structure is arranged above the movable structure; the moving structure comprises a moving part, one end of the moving part is rigidly connected with the sensing part, and the other end of the moving part is flexibly connected with the conducting part; the sensing piece corresponds to a chip in the sensor structure, and the conducting piece is fixed with the movable shaft. The invention provides an intelligent steering rear wheel steering position sensor which can realize accurate monitoring of a steering angle and has high sensor precision, thereby ensuring the accuracy of a feedback signal and improving the stability and safety of intelligent driving; the technical problems that in the prior art, the accuracy of sensor signals fed back in the intelligent driving field is not enough, and accurate monitoring cannot be carried out are solved.

Description

Intelligent steering rear wheel steering position sensor

Technical Field

The invention relates to a sensor structure, in particular to a steering position sensor of a rear wheel during intelligent driving.

Background

In modern society, automobiles have become one of the first-choice transportation tools for the public. The driving safety of automobiles is always one of the important directions of automobile research at present. Anti-lock brake systems, automatic brake structures, rollover prevention structures, and the like are all studied to improve driving safety.

At present, the research in the field of intelligent driving is more available, and intelligent driving is to know the conditions of roads, environments and vehicles through various vehicle-mounted sensing systems, automatically plan driving routes and control the vehicles to reach preset targets.

In an intelligent driving application scene, the angle rotation of the rear wheels of the automobile drives a rack through a motor, and the rack drives a steering mechanism to realize the steering of the rear wheels; the rear wheel steering position sensor monitors the stroke of the steering rack to monitor the rotation angle of the rear wheel, and feeds back a signal to the control system to check whether the actual rotation angle is correct.

Disclosure of Invention

The invention provides an intelligent steering rear wheel steering position sensor which can realize accurate monitoring of a steering angle and has high sensor precision, thereby ensuring the accuracy of a feedback signal and improving the stability and safety of intelligent driving; the technical problems that in the prior art, the accuracy of sensor signals fed back in the intelligent driving field is not enough, and accurate monitoring cannot be carried out are solved.

The technical problem of the invention is solved by the following technical scheme: a movable shaft is arranged in a shell, a movable structure is arranged on the movable shaft, a guide structure is arranged on the shell, the guide structure is matched with the movable structure, and a sensor structure is arranged above the movable structure; the moving structure comprises a moving part, one end of the moving part is rigidly connected with the sensing part, and the other end of the moving part is flexibly connected with the conducting part; the sensing piece corresponds to a chip in the sensor structure, and the conducting piece is fixed with the movable shaft. The movable shaft is connected with the steering rack, and the formed feedback performance is good by monitoring the displacement change of the steering rack, so that accurate monitoring is provided for intelligent driving. The induction piece on the moving structure corresponds to the chip in the sensor wire, and the axial movement of the induction piece enables the sensor to output signals to form feedback. The rigid connection means that the moving element and the sensing element are fixed and do not move relative to each other. The flexible connection means that a certain movable gap is formed between the moving part and the conducting part, and the conducting part receives the power of the moving shaft and drives the moving part to move linearly. The conduction piece is fixed with the removal axle, removes the axle motion and drives the conduction piece motion, removes the axle when the motion, probably produces and rocks to influence the precision of sensor, consequently, need utilize the flexonics formation transitional action of conduction piece, compensate most and rock the tolerance, thereby guarantee the sensor precision, improve whole monitored control system's the degree of accuracy and stability.

Preferably, the surface of the moving part, which is connected with the conducting part, is an arc surface. The cambered surface connection is equivalent to providing a spherical pair, so that the degree of freedom is high, the flexibility is good, the shaking tolerance can be well compensated, and the precision of the sensor is improved.

Preferably, the center of the moving element is provided with a spherical cavity, the conducting element comprises a spherical main body, the spherical main body is fixed in the movable shaft through a fixing rod, and the spherical main body is positioned in the spherical cavity. The spherical main body is similar to a universal wheel, and the shaking tolerance is effectively compensated. The ball head contact structure is simple, and the fixed rod is fixed in the movable shaft, so that the synchronous stability of the movable part and the movable shaft is ensured.

Preferably, the guide structure comprises a guide cavity formed in the shell, the moving structure is located in the guide cavity, a guide rail is arranged on the upper side of the guide cavity, and a guide protrusion matched with the guide rail is arranged on the sensing part. The cooperation of guide bulge both can reduce the frictional force in the slip process, also can improve the precision of slip.

Preferably, the sensor structure comprises a sensor shell, the lower end face of the sensor shell abuts against the upper end face of the guide cavity of the guide structure, and the sensing element is located between the sensor shell and the support face formed by the guide rail. After limiting the upper and lower displacement space of the induction piece, the air gap between the induction piece and the sensor can be ensured to be small, the accuracy of the sensor is improved, the shaking amount of the induction piece can be reduced, and the output accuracy of the sensor is improved.

Preferably, the sensing part is a metal sheet positioned above the moving part, the sensor structure comprises a sensor shell, a PCB is arranged in the sensor shell, and a chip and a coil are arranged on the PCB. The eddy current sensor mode is adopted, the feedback precision is improved, and the accurate sensor output signal can be improved aiming at the long-distance movement range of the moving shaft.

Preferably, the moving piece is composed of two moving blocks with the same shape, the surfaces of the two moving blocks which are connected are curved matching surfaces, and the connecting part of the two moving blocks is provided with a sensing piece mounting groove. The curved matching surface means that the abutting surface is in a step shape or a rectangular wave shape, so that the contact surfaces of the two moving blocks are embedded together.

Preferably, the length of the guide cavity of the guide mechanism is more than 60mm, and the guide cavity is in clearance fit with the moving part.

Therefore, the intelligent steering rear wheel steering position sensor has the following advantages: the intelligent driving system can meet the requirements of intelligent driving and perform feedback monitoring on the steering of the rear wheels, so that the intelligent driving is realized; the cooperation of the spherical guide piece and the moving piece compensates the shaking tolerance, ensures the precision of the sensor, improves the output precision of the sensor and ensures the stability of intelligent driving.

Drawings

Fig. 1 is a perspective view of an intelligent steering rear wheel steering position sensor of the present invention.

Fig. 2 is an exploded view of fig. 1.

Fig. 3 is a perspective view of fig. 1 with the sensor removed.

Fig. 4 is a top view of fig. 3.

Fig. 5 is a sectional view a-a of fig. 4.

Fig. 6 is a perspective view of fig. 3 with the housing and one motion block removed.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.

Example (b):

as shown in fig. 1 and 2, an intelligent steering rear wheel steering position sensor includes a housing 2 having a cylindrical passage 11 formed in the housing 2, and a movable shaft 3 installed in the cylindrical passage 11. A strip-shaped guide cavity 13 is formed in the upper portion of the shell 2, the guide cavity 13 is located above the cylindrical channel 11 and communicated with the cylindrical channel 11, and the length of the guide cavity 13 is 70 mm. A moving member 10 is installed in the guide chamber 13, and a metal sheet 7 is fixed to the moving member 10. The upper end face of the long strip-shaped guide cavity 13 is an open end, a guide rail 12 is arranged on the open end, the metal sheet 7 is rectangular, a protrusion 14 is integrally formed at each of four corners of the metal sheet 7, the four protrusions 14 are located on the guide rail 12, the lower end of the metal sheet 7 is fixed in the moving part 10 through a metal rod 16, and the metal sheet 7 slides on the guide rail 12 along with the movement of the moving part 10. The sensor housing 6 is mounted on the upper end face of the guide cavity 13 by a positioning pin and a screw. The sensor shell 6 seals the upper end opening of the guide cavity 13, so that the up-and-down fluctuation range of the metal sheet 7 is limited, the air gap of the sensor 1 is small, and the precision of the sensor 1 is improved. A PCB (printed circuit board) 5 is installed in the sensor shell 6, a chip and a coil are installed on the PCB 5, and the PCB and pins are sealed in the sensor shell 6 through a sensor cover plate 4.

As shown in fig. 3, 4, 5 and 6, a conductive element is fixed on the movable shaft 3, the conductive element comprises a spherical body 9 and a fixing rod 15 integrally formed with the spherical body, and a support ring 8 is sleeved between the spherical body 9 and the fixing rod 15. The fixed rod 15 is fixed in the movable shaft 3, and the spherical body 9 is connected with the moving member 10. The motion piece 10 is formed by two motion blocks 17 buckled with each other, the motion block 17 is cuboid-shaped, a hemispherical concave cavity is arranged at the center of the motion block 17, the two motion blocks 17 are matched and positioned through an L-shaped zigzag surface, a positioning pin 18 is integrally formed on the connected side surfaces of the motion blocks 17, and the two motion blocks 17 are matched after being matched through the positioning pin 18. The two kinematic blocks 17 cooperate to form a complete spherical cavity cooperating with the spherical body 9 of the conductor. The moving element is located in an elongated guide cavity 13, the moving element is in clearance fit with the guide cavity, and the guide cavity 13 provides a guide channel for the moving element. The moving member slides in the guide chamber 13 with the movement of the moving shaft. A fixing groove is reserved at the buckling position of the two moving parts, a metal rod 16 below the metal sheet 7 is inserted into the fixing groove, and the metal sheet 7 is fixed with the conducting part through the metal rod 16.

During the use, remove the axle and link to each other with the steering rack of rear wheel steering position, remove the axle and drive the motion piece and move at the direction intracavity, because spherical conductor will remove the flexible connection of axle and motion piece, effectively compensated the shake error, improved the sensor precision. The metal sheet above the moving piece moves on the guide rail along with the chip and the coil on the PCB to form an eddy current sensor, so that the sensor is suitable for monitoring signals of long-distance displacement motion, and the signal accuracy of the sensor is improved.

Claims

1. The utility model provides an intelligence turns to rear wheel steering position sensor which characterized in that: the shell is internally provided with a moving shaft, the moving shaft is provided with a moving structure, the shell is provided with a guide structure, the guide structure is matched with the moving structure, and a sensor structure is arranged above the moving structure; the moving structure comprises a moving part, one end of the moving part is rigidly connected with the sensing part, and the other end of the moving part is flexibly connected with the conducting part; the sensing piece corresponds to a chip in the sensor structure, and the conducting piece is fixed with the movable shaft.

2. An intelligent steering rear wheel steering position sensor according to claim 1, wherein: the surface of the moving part connected with the conducting part is a cambered surface.

3. An intelligent steering rear wheel steering position sensor according to claim 1 or 2, wherein: the center of the moving part is provided with a spherical cavity, the conducting part comprises a spherical main body, the spherical main body is fixed in the movable shaft through a fixing rod, and the spherical main body is positioned in the spherical cavity.

4. An intelligent steering rear wheel steering position sensor according to claim 1 or 2, wherein: the guide structure comprises a guide cavity arranged on the shell, the moving structure is positioned in the guide cavity, a guide rail is arranged on the upper side of the guide cavity, and a guide protrusion matched with the guide rail is arranged on the induction part.

5. An intelligent steering rear wheel steering position sensor according to claim 1 or 2, wherein: the sensor structure comprises a sensor shell, the lower end face of the sensor shell is abutted to the upper end face of the guide cavity of the guide structure, and the sensing piece is located between the sensor shell and a supporting face formed by the guide rail.

6. An intelligent steering rear wheel steering position sensor according to claim 1 or 2, wherein: the sensor structure comprises a sensor shell, a PCB is arranged in the sensor shell, and a chip and a coil are arranged on the PCB.

7. An intelligent steering rear wheel steering position sensor according to claim 1 or 2, wherein: the moving piece is composed of two moving blocks with the same shape, the surfaces of the two moving blocks which are connected are curve matching surfaces, and a sensing piece mounting groove is arranged at the joint of the two moving blocks.

8. An intelligent steering rear wheel steering position sensor according to claim 1 or 2, wherein: the length of a guide cavity of the guide mechanism is more than 60mm, and the guide cavity is in clearance fit with the moving part.