Electric adjusting drive-by-wire pedal structure

Abstract

The invention discloses an electric adjusting drive-by-wire pedal structure which comprises a pedal body, a pressure sensor assembly, a motor assembly and a speed reducing mechanism, the pressure sensor assembly detects the treading force in real time and outputs a signal, and a motor ECU receives the signal to generate a torque control instruction; dynamic torque output by the motor is transmitted to the pedal body after being subjected to multi-stage speed reduction and torque increase through the speed reduction mechanism, adjustable damping sense is generated, and pedal sense adjustability under different working conditions can be achieved without a simulator assembly. And the vehicle control unit communicates with the motor ECU through a CAN bus, and controls the pedal main body to be unfolded to a preset position when the vehicle is started and to be retracted to a storage position when the vehicle is shut down. The problems of structural redundancy and the like caused by the fact that a traditional drive-by-wire pedal depends on a mechanical simulator are solved, parameters can be customized, response is sensitive, the driving control precision is improved, space shielding of a cockpit is reduced, and convenience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wire-controlled pedals, and in particular to an electrically adjustable wire-controlled pedal structure. Background Art

[0002] With the development of automobile technology, the chassis by wire has become a future trend. The EMB (ElectroMechanical Braking) by wire is a key technology. The performance of the by-wire pedal, as the signal input source of the EMB, directly affects the braking effect of the vehicle. The existing mainstream by-wire pedal adjusts the pedal feel through the simulator, which has the following problems: each OEM has different requirements for the pedal feel, and different types of springs need to be configured inside the simulator, which makes the parts management cumbersome; and the existing by-wire pedal cannot realize the whole vehicle storage function, which makes it difficult to meet the diversified needs of the market. Summary of the invention

[0003] Purpose of the invention: In order to overcome the above-mentioned deficiencies, the purpose of the present invention is to provide an electrically adjustable wire-controlled pedal structure, which realizes adaptive adjustment of damping feel and pedal stroke in an architecture without a simulator assembly through a pressure sensor assembly, dynamically generates matching torque commands through the motor ECU, and adopts a collaborative control mechanism of multi-stage reduction mechanism torque feedback, thereby solving the problems of structural redundancy, inaccurate dynamic feedback and poor adaptability to working conditions caused by traditional wire-controlled pedals relying on mechanical simulators.

[0004] Technical solution: The present invention provides an electrically adjustable by-wire pedal structure, which includes: a pedal body for the driver to step on; a pressure sensor assembly provided at the force-receiving end of the pedal body for real-time detection of the foot force and output of a pressure value signal; a motor assembly, the motor assembly includes a motor ECU and a motor, the motor ECU is communicatively connected to the pressure sensor assembly for receiving the pressure value signal and generating a torque control instruction matching the pedal feel parameters; the motor is electrically connected to the motor ECU for outputting a dynamic torque according to the torque control instruction; a reduction mechanism connected between the output shaft of the motor and the pedal body for multi-stage decelerating and increasing the torque output by the motor and then transmitting it to the pedal body, so as to generate an adjustable damping feel; the damping feel is a linear or non-linear resistance perceived by the driver during stepping through the reduction mechanism and the motor torque feedback, the structure does not include a simulator assembly, and the torque output is dynamically adjusted by the motor ECU to achieve adjustable pedal feel under different working conditions or user requirements, the pedal feel is a driving feedback comprehensively formed based on the damping feel, pedal travel and rebound characteristics. The driver can customize parameters such as pedal hardness and travel sensitivity through vehicle settings to meet different driving styles. The electrical signal transmission and real-time torque control of the motor achieve millisecond-level response. Compared with traditional mechanical structures (such as spring damping delay), the pedal feedback is more sensitive and has higher linearity, improving the driving control accuracy.

[0005] Further, an electrically adjustable by-wire pedal structure in the present application further includes a vehicle controller communicatively connected to the motor ECU through a CAN bus for sending a vehicle start or stop state signal to the motor ECU, and the motor ECU controls the motor to drive the pedal body to expand to a preset position when the vehicle starts, or retract to a storage position when the vehicle stops according to the signal.

[0006] Further, in an electrically adjustable by-wire pedal structure in the present application, the reduction mechanism includes a primary reduction unit composed of a worm and a worm gear meshing, and a secondary reduction unit composed of a sun gear, a planet gear and a ring gear meshing. The secondary reduction unit further includes a planet carrier. The planet gear meshes with the ring gear through the planet carrier, and the rotating shaft of the planet carrier is connected to the pedal body to transmit the decelerated and torque-increased torque to the pedal body. When the vehicle starts, the driving motor expands the pedal to a preset position, preferably the optimal stepping angle of the driving position that the user can customize. When the vehicle stops, the driving motor retracts the pedal to the storage position, preferably flush with or fitting to the floor, reducing the obstruction of the space in the cockpit and improving the convenience of the driver getting on and off the vehicle or cleaning inside the vehicle.

[0007] Furthermore, an electric adjustable wire-controlled pedal structure in the present application, the pedal body includes a pedal, a spring seat, a double spring, a spring support seat, a guide shell, a lower cover plate, and a pedal arm, the pressure sensor assembly includes a pressure sensor, the spring seat is arranged between the pedal and the spring support seat, the double spring is composed of an inner and outer spring, the inner spring is sleeved in the outer spring, the upper end of the double spring abuts against the pedal, and the lower end abuts against the spring support seat, for providing linear elastic restoring force and transmitting the pedaling force to the pressure sensor, the guide shell is installed on the lower cover plate, the pressure sensor is arranged between the lower cover plate and the spring support seat, the spring seat, the double spring, and the spring support seat are arranged in the guide shell, one end of the pedal arm is installed on the outer side of the guide shell, and the other end is connected to the output end of the deceleration mechanism. The inner spring is sleeved inside the outer spring, and the two are arranged coaxially. The double spring structure can offset the radial deviation or lateral bending problems that may occur in the single spring, ensuring that the elastic force is transmitted only along the pedaling direction (axial direction), avoiding additional force interference with the detection accuracy of the pressure sensor. The guide housing is sleeved on the outside of the spring seat, double springs, and the lower support seat of the spring to provide axial guidance for the compression and rebound movement of the spring, preventing the spring from radially shaking or even getting stuck under high-frequency pedaling or large-stroke conditions, thereby ensuring the smoothness of the spring movement.

[0008] Furthermore, in the electric adjustable wire-controlled pedal structure in the present application, the pedal body also includes a pair of return two-way damping devices, which are respectively installed on the mounting ears on the two outer sides of the spring seat, for suppressing the mechanical vibration when the pedal rebounds; the return two-way damping device realizes adaptive resistance adjustment of the pedal movement direction through an electromagnetic brake. The double spring provides basic elastic restoring force, but the spring may produce a "sense of impact" (such as a hard impact when the pedal rebounds to the top) due to the sudden change of elastic force at the end of compression and rebound (close to the maximum stroke or fully released). The two-way damping device weakens the sudden force at the end of the spring through continuous resistance buffering, avoids the discomfort of "pushing the foot" or "bouncing the foot", and enhances the pedal feel.

[0009] Furthermore, in the electric adjustment wire-controlled pedal structure in the present application, the pedal body also includes a guide column, the lower spring support seat is provided with a through hole, the guide column is inserted into the through hole, and the two ends are respectively abutted against the spring seat and the lower cover plate. The guide column is inserted into the through hole of the lower spring support seat, and the two ends are respectively fixedly connected to the spring seat (upper) and the lower cover plate (lower), forming a rigid guide shaft that runs through the axial direction of the pedal body. The lower spring support seat is sleeved on the outside of the guide column through the through hole, and its movement trajectory is strictly limited to the axial direction of the guide column, and it is only allowed to slide up and down along the guide column, and is completely constrained in the radial direction.

[0010] Furthermore, an electric adjustable by-wire pedal structure in the present application further includes a base. The base is rotatably connected to the pedal body and the reduction mechanism through the reduction shaft of the reduction mechanism. The base is fixed to the vehicle body floor by bolts or welding. The reduction shaft passes through the bearing hole of the base to form the rotation fulcrum of the pedal body, that is, the pedal rotates around the reduction shaft. When the driver steps on the pedal, the pedal body makes an arc motion centered on the reduction shaft. The base supports the reduction shaft through bearings to ensure low friction and high smoothness during the rotation process.

[0011] Furthermore, in an electric adjustable by-wire pedal structure in the present application, a stop damper and a return damper are provided on the base. The stop damper and the return damper are respectively arranged at the lower end and the upper end of the base. When the driver steps on the pedal and the pedal arm rotates along the reduction shaft to the lower end of the base, the lower side of the pedal arm abuts against the stop damper. When the pedal is released and the pedal arm returns, the upper side abuts against the return damper. When the driver steps on the pedal to the maximum stroke, the lower side of the pedal arm abuts against the stop damper. The damper absorbs the kinetic energy of the pedal arm through elastic deformation or viscous medium to avoid direct metal impact between the pedal arm and the base. When the pedal moves upward to the initial position, that is, when the pedal is completely reset after being released, the upper side of the pedal arm abuts against the return damper. The damper slows down the return speed of the pedal arm through the resistance effect.

[0012] As can be seen from the above technical solutions, the present invention has the following beneficial effects: 1. The electric adjustable by-wire pedal structure of the present invention realizes the dynamic adaptive adjustment of the pedal feel through the cooperative control mechanism of the pressure sensor assembly and the motor ECU. By real-time detecting the stepping force and generating a matching torque command, it does not rely on traditional mechanical simulators, solves the problem of cumbersome parts management caused by differences in simulator models in traditional pedals, and at the same time converts the motor output into precise pedal damping feedback through a multi-stage reduction and torque-increasing mechanism, supporting the driver to customize parameters such as pedal hardness and stroke sensitivity to meet the needs of different driving styles.

[0013] 2. The electric adjustable by-wire pedal structure of the present invention cooperates with the vehicle controller. When the vehicle starts, the drive motor automatically unfolds the pedal to the optimal stepping angle preset by the user, and retracts it to the storage position flush with the floor when the vehicle shuts down, reducing the occlusion of the cockpit space, improving the convenience of getting in and out of the vehicle and the cleaning efficiency inside the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of an electric adjustable by-wire pedal structure of the present invention; Figure 2 It is an exploded schematic view A of some components of an electric adjustable by-wire pedal structure of the present invention; Figure 3 It is an exploded schematic view B of some components of an electric adjustable by-wire pedal structure of the present invention; Figure 4 Figure C is an exploded schematic diagram of some components of the electric adjustable wire-controlled pedal structure of the present invention.

[0015] Description of the Figures in the Specification: 1- pedal body, 11- pedal, 12- spring seat, 121- mounting ear, 13- double spring, 14- spring lower support seat, 141- perforation, 15- guide housing, 16- lower cover plate, 17- pedal arm, 18- forward and return two-way damping device, 19- guide column; 2-pressure sensor assembly, 21-pressure sensor; 3-motor assembly, 31-motor ECU, 32-motor; 4-reduction mechanism, 41-worm, 42-worm wheel, 43-sun gear, 44-planetary gear, 45-ring gear, 46-planet carrier, 47-reduction shaft; 5-base, 51-stop damping, 52-return damping DETAILED DESCRIPTION

[0016] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0017] like Figures 1-4 As shown, the specific assembly and working process of an electric adjustable wire-controlled pedal structure are as follows: 1. Component assembly relationship Assembly of pedal body 1 A spring seat 12 is fixed at the center of the bottom of the pedal 11 , and the upper end of the double spring 13 (inner spring sleeved with outer spring) abuts against the pedal 11 , and the lower end abuts against the lower spring support seat 14 , forming an elastic support structure.

[0018] The guide housing 15 is fixed to the lower cover plate 16 by bolts, and the spring seat 12, the double spring 13, and the spring lower support seat 14 are encapsulated inside to achieve axial guidance.

[0019] The pressure sensor 21 is attached between the lower cover plate 16 and the lower spring support seat 14 to detect the pressure signal transmitted by the pedaling force.

[0020] One end of the pedal arm 17 is fixed to the outside of the guide housing 15 by bolts, and the other end is key-connected to the reduction shaft 47 of the reduction mechanism 4 to form a torque transmission hub.

[0021] The guide column 19 passes through the through hole 141 of the spring lower support seat 14 , and its two ends respectively abut against the spring seat 12 and the lower cover plate 16 to limit the radial movement of the spring lower support seat 14 .

[0022] The bi-directional damping device 18 (electromagnetic brake) for the forward and return trips is mounted on the mounting ears 121 on both sides of the spring seat 12 through bolts. The end of the damping rod abuts against the inner wall of the guide housing to buffer the rebound vibration of the pedal.

[0023] The transmission chain of the reduction mechanism 4 The output shaft of the motor 32 is coaxially fixed with the worm 41, and the worm gear 42 meshes with the worm 41 to form a primary reduction unit (reduction ratio i1).

[0024] The sun gear 43 is fixed to the end of the shaft of the worm gear 42. The sun gear 43 meshes with three planet gears 44. The planet gears 44 mesh with the ring gear 45 (fixed to the base 5) through the planet carrier 46 to form a secondary planetary reduction unit (reduction ratio i2).

[0025] The rotating shaft of the planet carrier 46 is coaxially fixed with the reduction shaft 47 connected to the pedal arm 17, converting the high-speed low-torque of the motor 32 into the low-speed high-damping torque of the pedal body 1.

[0026] The base 5 is linked with the whole vehicle The base 5 is fixed to the vehicle floor through bolts, and a bearing hole is opened in the middle to install the reduction shaft 47, forming a rotation fulcrum of the pedal body 1.

[0027] The stop damping 51 (rubber buffer block) is embedded in the lower end face of the base 5. When the pedal arm 17 follows the pedal 11 to step to the maximum stroke, its lower side abuts against the stop damping 51 to absorb the impact energy.

[0028] The return damping 52 (helical spring damper) is installed on the upper end face of the base 5. When the pedal arm 17 rebounds to the initial position, its upper side contacts the return damping 52 to slow down the reset speed.

[0029] The vehicle controller communicates with the motor ECU 31 through the CAN bus. When the vehicle starts, it sends a signal to drive the motor 32 to rotate counterclockwise, and the pedal body 1 is unfolded to a preset angle (such as 30° with the horizontal plane) through the reduction mechanism 4; when the vehicle shuts off, the motor 32 rotates clockwise to retract the pedal body 1 to the storage position flush with the floor.

[0030] II. Working process Pedal force detection and damping adjustment When the driver steps on the pedal 11, the double springs 13 are compressed and transmit the force to the spring lower support seat 14. The pressure sensor 21 detects the pressure value in real time and transmits it to the motor ECU 31.

[0031] The motor ECU 31 calculates the matching torque command according to the preset pedal feel parameters (such as hardness, stroke sensitivity), and drives the motor 32 to output dynamic torque.

[0032] After the torque is reduced and increased by two stages through the worm 41 - worm gear 42 and the sun gear 43 - planet gear 44 - ring gear 45, it is transmitted to the pedal arm 17 through the planet carrier 46, forming a damping feeling opposite to the stepping force and realizing the "electric feedback" pedal experience.

[0033] Vibration suppression and motion guidance When the pedal 11 rebounds, the electromagnetic brake of the two-way damping device 18 for the forward and return strokes automatically adjusts the resistance according to the motion direction to suppress the spring oscillation; the guide post 19 cooperates with the guide housing 15 to ensure that the spring lower support seat 14 slides smoothly along the axis and avoid radial deviation from affecting the accuracy of the pressure sensor 21.

[0034] Vehicle state linkage When the vehicle controller detects a start signal, the motor ECU 31 controls the motor 32 to drive the pedal body 1 to rotate around the reduction shaft 47 to the best stepping angle defined by the user; when the ignition-off signal is triggered, the pedal automatically retracts to reduce the occupancy of the cockpit space.

[0035] The technical principle of the present invention has been described in combination with specific embodiments above. These descriptions are only for explaining the principle of the present invention and cannot be interpreted in any way as a limitation on the protection scope of the present invention. Based on the explanations herein, those skilled in the art can think of other specific embodiments of the present invention without creative efforts, and these embodiments will fall within the protection scope of the present invention.

Claims

1. An electric adjustable wire-controlled pedal structure, characterized in that Comprising: A pedal body (1) for a driver to step on; A pressure sensor assembly (2) provided at the force-receiving end of the pedal body (1) for real-time detection of the foot stepping force and outputting a pressure value signal; A motor assembly (3), the motor assembly (3) includes a motor ECU (31) and a motor (32), the motor ECU (31) is communicatively connected to the pressure sensor assembly (2) for receiving the pressure value signal and generating a torque control command matching the pedal feel parameters; the motor (32) is electrically connected to the motor ECU (31) for outputting a dynamic torque according to the torque control command; A reduction mechanism (4) connected between the output shaft of the motor (32) and the pedal body (1) for transmitting the torque output by the motor (32) to the pedal body (1) after multi-stage reduction and torque increase, thereby generating an adjustable damping feel; The structure does not include a simulator assembly, and the torque output is dynamically adjusted by the motor ECU (31) to achieve adjustable pedal feel under different working conditions or user requirements.

2. An electronically adjustable by-wire pedal structure according to claim 1, wherein It further includes a vehicle controller communicatively connected to the motor ECU (31) via a CAN bus for sending a vehicle start or stop state signal to the motor ECU (31), and the motor ECU (31) controls the motor (32) to drive the pedal body (1) to expand to a preset position when the vehicle starts or retract to a storage position when the vehicle stops according to the signal.

3. An electronically adjustable by-wire pedal structure according to claim 1, wherein The reduction mechanism (4) includes a primary reduction unit composed of a worm (41) meshing with a worm wheel (42), and a secondary reduction unit composed of a sun gear (43), planet gears (44), and a ring gear (45) meshing. The secondary reduction unit further includes a planet carrier (46), the planet gears (44) mesh with the ring gear (45) through the planet carrier (46), and the rotating shaft of the planet carrier (46) is connected to the pedal body (1) to transmit the torque after reduction and torque increase to the pedal body (1).

4. An electronically adjustable by-wire pedal structure according to claim 1, wherein The pedal body (1) comprises a pedal (11), a spring seat (12), a double spring (13), a spring lower support seat (14), a guide housing (15), a lower cover plate (16), and a pedal arm (17); the pressure sensor assembly (2) comprises a pressure sensor (21); the spring seat (12) is arranged between the pedal (11) and the spring lower support seat (14); the double spring (13) comprises an inner spring and an outer spring; the inner spring is sleeved in the outer spring; the upper end of the double spring (13) abuts against the pedal (11); and the lower end abuts against the spring The guide housing (15) is abutted against the lower spring support seat (14) to provide a linear elastic restoring force and transmit the pedaling force to the pressure sensor (21); the guide housing (15) is mounted on the lower cover plate (16); the pressure sensor (21) is arranged between the lower cover plate (16) and the lower spring support seat (14); the spring seat (12), the double spring (13), and the lower spring support seat (14) are arranged in the guide housing (15); one end of the pedal arm (17) is mounted on the outer side of the guide housing (15), and the other end is connected to the output end of the speed reduction mechanism (4).

5. The electrically adjustable wire-controlled pedal structure according to claim 4, characterized in that: The pedal body (1) further comprises a pair of forward and return bidirectional damping devices (18), which are respectively mounted on mounting ears (121) on both outer sides of the spring seat (12) and are used to suppress mechanical vibration when the pedal (11) rebounds; the forward and return bidirectional damping devices (18) achieve adaptive resistance adjustment in the direction of movement of the pedal (11) through an electromagnetic brake.

6. The electrically adjustable wire-controlled pedal structure according to claim 5, characterized in that: The pedal body (1) further comprises a guide column (19), the lower spring support seat (14) is provided with a through hole (141), the guide column (19) is passed through the through hole (141), and the two ends of the guide column (19) respectively abut against the spring seat (12) and the lower cover plate (16).

7. The electrically adjustable wire-controlled pedal structure according to claim 4, characterized in that: It also comprises a base (5), wherein the base (5) is rotationally connected to the pedal body (1) and the speed reduction mechanism (4) via a speed reduction shaft (47) of the speed reduction mechanism.

8. The electrically adjustable wire-controlled pedal structure according to claim 7, characterized in that: The base (5) is provided with a stop damper (51) and a return damper (52), and the stop damper (51) and the return damper (52) are respectively arranged at the lower end and the upper end of the base (5); when the driver steps on the pedal (11), the pedal arm (17) rotates along the deceleration shaft (47) to the lower end of the base (5), and the lower side of the pedal arm (17) contacts the stop damper (51); when the pedal (11) is released, the pedal arm (17) returns to its original position, and the upper side contacts the return damper (52).

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