Drive-by-wire pedal

Abstract

The drive-by-wire pedal comprises a pedal body, a shell, an elastic assembly and a piston, the shell is used for containing the elastic assembly and the piston, the pedal body is fixedly installed at one end of the piston, the elastic assembly comprises a first elastic piece, a second elastic piece and a third elastic piece, and the first elastic piece and the second elastic piece are connected in series; the second elastic piece and the third elastic piece are connected in parallel; a displacement sensor is arranged between the pedal and the shell, and a force sensor is arranged between the pedal and the piston. According to the drive-by-wire pedal provided by the invention, different feedback forces are provided according to different displacement stages of the pedal through the cooperation of a plurality of elastic pieces in the elastic assembly, so that a feedback feeling of pedal force can be better given to a driver, and the driver can control the pedal conveniently.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicles, and in particular relates to a wire-controlled pedal. Background Art

[0002] The wire-controlled pedal is an important part of the wire-controlled brake system, which mainly consists of a brake pedal and a pedal sensor. When the driver steps on the brake pedal, the pedal sensor detects the change in the pedal's rotation angle, displacement or force, and converts these physical signals into electrical signals, which are then transmitted to the electronic control unit.

[0003] In the related art, the wire-controlled pedal detects the vehicle status through sensors, converts it into electrical signals or digital signals, and sends them to the vehicle control system. The vehicle control system calculates the control instructions based on the preset algorithm and real-time feedback information, and achieves precise control through the actuator. However, it is difficult for the wire-controlled pedal in the related art to give the driver a force feedback feeling according to the different displacements of the pedal. Summary of the invention

[0004] The purpose of the present invention is to provide a wire-controlled pedal to solve the problem in the related art that the wire-controlled pedal is difficult to give the driver a force feedback feeling according to different displacements of the pedal.

[0005] To this end, the first aspect of the present invention provides a wire-controlled pedal, comprising a pedal, a shell, an elastic component and a piston, the shell being used to accommodate the elastic component and the piston, the pedal being fixedly mounted at one end of the piston, the elastic component comprising a first elastic member, a second elastic member and a third elastic member, the first elastic member and the second elastic member being connected in series, and the second elastic member and the third elastic member being connected in parallel; a displacement sensor is arranged between the pedal and the shell, and a force sensor is arranged between the pedal and the piston.

[0006] Preferably, the elastic component further includes a spring seat, and the first elastic member and the second elastic member are connected in series via the spring seat.

[0007] Preferably, the first elastic member is arranged at one end of the spring seat, the second elastic member is sleeved on the spring seat, the two ends of the second elastic member are respectively connected to the spring seat and the piston, the spring seat is slidably connected to the piston, and the third elastic member is inside the piston.

[0008] Preferably, a wedge block and a friction ring are provided on the side wall of the piston, the friction ring is in contact with the inner wall of the housing, and the wedge block is used to fix the friction ring.

[0009] Preferably, the friction ring comprises a friction surface and an inclined surface, the friction surface is in contact with the inner wall of the housing, and the inclined surface is in contact with the wedge block.

[0010] Preferably, the displacement sensor comprises a sensor push rod and a sensor stator, the sensor push rod is fixedly mounted on the pedal, the sensor push rod is slidably connected to the housing, and the sensor stator is fixedly mounted in the housing.

[0011] Preferably, two displacement sensors are provided.

[0012] Preferably, a first force sensor is provided between the pedal and the piston.

[0013] Preferably, a second force sensor is provided between the shell and the elastic component.

[0014] Preferably, a dust cover is provided between the pedal and the housing, and the dust cover is used to prevent foreign matter from entering.

[0015] Beneficial effects: 1. The present invention provides a wire-controlled pedal, which provides different feedback forces according to different displacement stages of the pedal through the cooperation of multiple elastic members in an elastic assembly, thereby being able to give the driver a better feedback feeling of the pedal force and facilitating the driver's control.

[0016] 2. The present invention uses a combination of multiple sensors to provide timely and accurate feedback on the driver's intentions, with signal redundancy to ensure safety.

[0017] 3. In the present invention, by cooperating with the friction ring and the wedge block, the friction between the friction ring and the inner wall of the housing is utilized to improve the stability of the pedal during displacement, and to provide the driver with a better feedback feeling of the pedal force.

[0018] 4. The wire-controlled pedal in the present invention has a compact structure and can be easily arranged on a vehicle; it has a simple structure and low cost; and it is suitable for a variety of wire-controlled applications, such as a brake pedal or an accelerator pedal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic structural diagram of a wire-controlled pedal in the present invention.

[0021] Figure 2 It is a cross-sectional view of a wire-controlled pedal in the present invention.

[0022] Figure 3 It is a cross-sectional view of a wire-controlled pedal in the present invention.

[0023] Figure 4 It is an enlarged cross-sectional view of a wire-controlled pedal in the present invention.

[0024] In the figure, 1-pedal, 2-housing, 3-elastic component, 31-first elastic member, 32-second elastic member, 33-third elastic member, 34-spring seat, 4-piston, 5-wedge block, 6-friction ring, 61-friction surface, 62-inclined surface, 7-first displacement sensor, 71-first sensor push rod, 72-first sensor stator, 8-second displacement sensor, 81-second sensor push rod, 82-second sensor stator, 9-first force sensor, 10-second force sensor. DETAILED DESCRIPTION

[0025] The content of the present invention can be more easily understood by selecting the following detailed description of the preferred implementation method of the present invention and the embodiments included. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those of ordinary skill in the art to which the present invention belongs. When there is a conflict, the definition in this specification shall prevail.

[0026] Embodiment 1: like Figure 1-4 As shown, the first aspect of this embodiment provides a wire-controlled pedal, including a pedal 1, a housing 2, an elastic component 3 and a piston 4, wherein the housing 2 is used to accommodate the elastic component 3 and the piston 4, the pedal 1 is fixedly mounted at one end of the piston 4, the elastic component 3 includes a first elastic member 31, a second elastic member 32 and a third elastic member 33, the first elastic member 31 and the second elastic member 32 are connected in series, and the second elastic member 32 and the third elastic member 33 are connected in parallel; a displacement sensor is provided between the pedal 1 and the housing 2, and a force sensor is provided between the pedal 1 and the piston 4. Through the cooperation of multiple elastic members in the elastic component 3, different feedback forces are provided according to different displacement stages of the pedal 1, so that the driver can be better given a feedback feeling of the pedal 1 force, which is convenient for the driver to control.

[0027] The elastic component 3 also includes a spring seat 34, through which the first elastic member 31 and the second elastic member 32 are connected in series. The first elastic member 31 is arranged at one end of the spring seat 34, the second elastic member 32 is sleeved on the spring seat 34, the two ends of the second elastic member 32 are respectively connected to the spring seat 34 and the piston 4, the spring seat 34 is slidably connected to the piston 4, and the third elastic member 33 is inside the piston 4. In one embodiment, the first elastic member 31 and the second elastic member 32 are helical compression springs, the third elastic member 33 is rubber, and the center lines of the first elastic member 31, the second elastic member 32, the third elastic member 33 and the spring seat 34 are on the same straight line, providing feedback force for the pedal 1. By adjusting the stiffness parameters of the first elastic member 31, the second elastic member 32 and the third elastic member 33, different pedal 1 force requirements can be adapted.

[0028] A wedge block 5 and a friction ring 6 are provided on the side wall of the piston 4. The friction ring 6 contacts the inner wall of the housing 2. The wedge block 5 is used to fix the friction ring 6. The friction ring 6 includes a friction surface 61 and an inclined surface 62. The friction surface 61 contacts the inner wall of the housing 2, and the inclined surface 62 contacts the wedge block 5. The wedge block 5 provides support for the friction ring 6 through the inclined surface 62, so that the friction ring 6 deforms outward. The friction ring 6 contacts the inner wall of the housing 2 through the friction surface 61, generating pressure. When the piston 4 pushes the friction ring 6 forward, friction is generated between the friction surface 61 and the housing 2. As the feedback force increases, the friction force generated increases. Since there is friction in the process of the pedal 1 moving forward and backward, the stability of the pedal 1 in the fixed position is improved, and a better pedal feedback feeling is provided. The magnitude of the friction force can be adjusted by adjusting the angle of the inclined surface 62.

[0029] Two displacement sensors are provided. In one embodiment, the two displacement sensors are respectively a first displacement sensor 7 and a second displacement sensor 8, which are symmetrically arranged on the pedal 1. The first displacement sensor 7 includes a first sensor push rod 71 and a first sensor stator 72, and the second displacement sensor 8 includes a second sensor push rod 81 and a second sensor stator 82. The first sensor push rod 71 and the second sensor push rod 81 are fixedly mounted on the pedal 1, and the first sensor push rod 71 and the second sensor push rod 81 are slidably connected to the housing 2, and the first sensor stator 72 and the second sensor stator 82 are fixedly mounted in the housing 2. The first sensor push rod 71 and the second sensor push rod 81 move together with the pedal 1, cooperate with the first sensor stator 72 and the second sensor stator 82, sense signal changes, and measure the displacement of the pedal 1. The first displacement sensor 7 and the second displacement sensor 8 are Hall sensors or inductive sensors.

[0030] A first force sensor 9 is provided between the pedal 1 and the piston 4. A second force sensor 10 is provided between the housing 2 and the elastic component 3. The first force sensor 9 is used to measure the magnitude of the force of the driver stepping on the pedal 1, and the second force sensor 10 is used to measure the magnitude of the feedback force of the elastic component 3.

[0031] A dust cover (not shown in the figure) is provided between the pedal 1 and the housing 2, and the dust cover is used to prevent foreign matter from entering.

[0032] Working principle: After the driver steps on the pedal 1, the pedal 1 has three displacement stages. In the first stage, the piston 4 passes through the friction ring 6 and rubs against the inner wall of the shell to generate friction force, and at the same time compresses the second elastic member 32. The second elastic member 32 transmits the force to the first elastic member 31 through the spring seat 34. At this time, the first elastic member 31 and the second elastic member 32 act together in series, and the compression stiffness is the stiffness of the first elastic member 31 and the second elastic member 32 in series. In the second stage, the piston 4 continues to move forward. After the first elastic member 31 and the second elastic member 32 are compressed to the point that the spring seat 34 contacts the end cover of the shell, the first elastic member 31 can no longer be compressed. At this time, only the second elastic member 32 acts, and the compression stiffness is the stiffness of the second elastic member 32. In the third stage, the piston 4 continues to move forward. The third elastic member 33 in the piston 4 contacts the spring seat 34. At this time, the second elastic member 32 and the third elastic member 33 act together, and the compression stiffness is the stiffness of the second elastic member 32 and the third elastic member 33 in parallel. When the pedal 1 contacts the shell 2, the pedal 1 reaches the end of the displacement and can no longer move forward. The first sensor push rod 71 and the second sensor push rod 81 move together with the pedal 1, cooperate with the first sensor stator 72 and the second sensor stator 82, sense the signal change, and measure the displacement of the pedal 1. The first force sensor 9 is used to measure the magnitude of the force of the driver stepping on the pedal 1, and the second force sensor 10 is used to measure the magnitude of the feedback force of the elastic component 3.

[0033] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A wire-controlled pedal, characterized in that: It includes a pedal, a shell, an elastic component and a piston, the shell is used to accommodate the elastic component and the piston, the pedal is fixedly installed at one end of the piston, the elastic component includes a first elastic member, a second elastic member and a third elastic member, the first elastic member and the second elastic member are connected in series, and the second elastic member and the third elastic member are connected in parallel; a displacement sensor is arranged between the pedal and the shell, and a force sensor is arranged between the pedal and the piston; a wedge block and a friction ring are arranged on the side wall of the piston, the friction ring is in contact with the inner wall of the shell, and the wedge block is used to fix the friction ring; the friction ring includes a friction surface and an inclined surface, the friction surface is in contact with the inner wall of the shell, and the inclined surface is in contact with the wedge block.

2. A wire-controlled pedal according to claim 1, characterized in that: The elastic component also includes a spring seat, and the first elastic member and the second elastic member are connected in series through the spring seat.

3. A wire-controlled pedal according to claim 2, characterized in that: The first elastic member is arranged at one end of the spring seat, the second elastic member is sleeved on the spring seat, the two ends of the second elastic member are respectively connected to the spring seat and the piston, the spring seat is slidably connected to the piston, and the third elastic member is inside the piston.

4. The wire-controlled pedal according to claim 1, characterized in that: The displacement sensor comprises a sensor push rod and a sensor stator. The sensor push rod is fixedly mounted on the pedal, the sensor push rod is slidably connected to the housing, and the sensor stator is fixedly mounted in the housing.

5. A wire-controlled pedal according to claim 1 or 4, characterized in that: Two displacement sensors are provided.

6. The wire-controlled pedal according to claim 1, characterized in that: A first force sensor is arranged between the pedal and the piston.

7. The wire-controlled pedal according to claim 1, characterized in that: A second force sensor is arranged between the shell and the elastic component.

8. The wire-controlled pedal according to claim 1, characterized in that: A dust cover is arranged between the pedal and the housing, and the dust cover is used to prevent foreign matter from entering.

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