Brake pedal position sensor of brake-by-wire system

Abstract

The utility model discloses a brake pedal position sensor of a brake-by-wire system, which belongs to the technical field of automobile sensors, and comprises a stator shell, a PCB (Printed Circuit Board), a cover body and a rotor, the stator shell comprises a square first sub-shell and a cylindrical second sub-shell; the PCB is fixed in the first sub-shell, and a Hall chip, a transmitting coil and a receiving coil are attached to the PCB; the cover plate is fixed on the first sub-shell; the first sub-shell and the second sub-shell are arranged on the first sub-shell, the rotor is rotatably connected in the second sub-shell, an eddy current blade and a magnet are fixed in the rotor, and the centers of the rotor, the eddy current blade and the magnet coincide. Redundant signals from different technical principles are output, and the risk that two paths of output of the sensor fail due to external interference is reduced, so that the safety requirement is met.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile sensors, in particular to a brake pedal position sensor for a wire-controlled brake system. Background Art

[0002] Existing automotive braking systems are generally hydraulic brake systems. The brake pedal is connected to the power-assisted master cylinder through a mechanical linkage. By measuring the position of the power-assisted master cylinder piston rod, on the one hand, feedback signals are provided to the brake system's electronic control unit to execute pressurization, depressurization, and pressure maintenance; on the other hand, signals are provided to the ABS anti-lock braking system, brake force distribution system, brake assist system, etc. A relatively simple discrete switch sensor is installed at the brake pedal end to control the brake lights and other functions that require the brake pedal to trigger.

[0003] This method requires a mechanical connection between the brake pedal and the power-assisted master cylinder to transmit position changes. However, for automated driving and other systems that use brake-by-wire control, there is no mechanical connection between the brake pedal and the actuator, and control is entirely through electrical signals. The simple on-off signal of the current brake pedal sensor cannot meet the system's requirements for absolute position detection. Utility Model Content

[0004] In order to solve the above problems, the present invention provides a brake pedal position sensor for a brake-by-wire system, which is implemented through the following technical solutions.

[0005] A brake pedal position sensor for a brake-by-wire system, comprising:

[0006] The stator housing is an integrally formed injection molded part, comprising a square first sub-housing and a cylindrical second sub-housing, with mounting ears fixed to the front, rear, and left sides of the second sub-housing;

[0007] A PCB circuit board, the PCB circuit board is fixed in the first sub-housing, and the PCB circuit board is affixed with a Hall chip, a transmitting coil, and a receiving coil;

[0008] a cover plate, the cover plate being fixed to the first sub-housing by laser welding;

[0009] The rotor is rotatably connected to the second sub-housing, and eddy current blades and magnets are fixed in the rotor. The centers of the rotor, the eddy current blades, and the magnets coincide, and the eddy current blades and the magnets are fixed in the rotor by means of integral insert injection molding.

[0010] Preferably, the rotor is stepped, a positioning block is fixed at a position corresponding to the rotor step groove in the second sub-shell, buckles are evenly fixed on the bottom circumference of the second sub-shell, and the rotor is movably fastened to the second sub-shell through the buckles.

[0011] Preferably, the PCB circuit board is fixed in the first sub-housing by four-point hot riveting.

[0012] Preferably, a connector is fixed to the bottom of the rotor.

[0013] Preferably, a plug is integrally formed on the right side of the stator housing, and a power connection pin is fixed in the stator housing by means of an insert integrally injection-molded. One end of the power connection pin extends into the first sub-housing to be electrically connected to the PCB circuit board, and the other end is located in the plug.

[0014] The beneficial effects of the utility model are as follows:

[0015] 1. The unique sensor structure design integrates both Hall and eddy current technology solutions into the same sensor body, outputting redundant signals from different technical principles, reducing the risk of both sensor outputs failing due to external interference, thereby meeting safety requirements.

[0016] 2. The sensor has a compact structure and small installation space, which effectively reduces the assembly size of the client. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the description of the specific implementation methods. 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 any creative work.

[0018] Figure 1 : An exploded view of a brake pedal position sensor for a brake-by-wire system according to the present invention;

[0019] Figure 2 : Axonometric view of the assembled brake pedal position sensor for a brake-by-wire system according to the present invention;

[0020] Figure 3 : A three-dimensional schematic diagram of the lower side of a brake pedal position sensor for a brake-by-wire system according to the present invention after assembly;

[0021] Figure 4 : Schematic diagram of the internal structure of the second sub-shell of the present invention;

[0022] Figure 5 : A cross-sectional view of the rotor of the present invention.

[0023] The reference numerals are as follows:

[0024] 1- stator housing, 11- first sub-housing, 12- second sub-housing, 13- mounting ear seat, 14- plug, 15- power pin, 2- PCB circuit board, 3- cover plate, 4- rotor, 41- eddy current blade, 42- magnet, 43- positioning block, 44- buckle, 45- connector. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0026] like Figure 1-5 As shown, a brake pedal position sensor for a wire control brake system includes:

[0027] The stator housing 1 is an integrally formed injection molded part. The stator housing 1 comprises a square first sub-housing 11 and a cylindrical second sub-housing 12. Mounting ears 13 are fixed to the front, rear, and left sides of the second sub-housing 12.

[0028] PCB circuit board 2, the PCB circuit board 2 is fixed in the first sub-housing 11, and the PCB circuit board 2 is affixed with a Hall chip, a transmitting coil, and a receiving coil;

[0029] The cover plate 3 is fixed to the first sub-housing 11 by laser welding;

[0030] The rotor 4 is rotatably connected to the second sub-housing 12, and eddy current blades 41 and magnets 42 are fixed in the rotor 4. The centers of the rotor 4, the eddy current blades 41, and the magnets 42 coincide with each other, and the eddy current blades 41 and the magnets 42 are fixed in the rotor 4 by means of one-piece insert injection molding.

[0031] Furthermore, the rotor 4 is stepped, and a positioning block 43 is fixed to the position of the second sub-shell 12 corresponding to the step groove of the rotor 4. Buckles 44 are evenly fixed to the bottom circumference of the second sub-shell 12, and the rotor 4 is movably clamped in the second sub-shell 12 through the buckles 44.

[0032] Furthermore, the PCB circuit board 2 is fixed in the first sub-housing 11 by four-point hot riveting.

[0033] Furthermore, a connector 45 is fixed to the bottom of the rotor 4 .

[0034] Furthermore, a plug 14 is integrally formed on the right side of the stator housing 1, and a power connection pin 15 is fixed in the stator housing 1 by means of an insert integrally injection molded. One end of the power connection pin 15 extends into the first sub-housing 11 and is electrically connected to the PCB circuit board 2, and the other end is located in the plug 14.

[0035] A specific embodiment of the present invention is as follows:

[0036] like Figure 1 As shown, when the sensor is assembled, the stator housing 1 is formed by one-piece insert injection molding, and power pins are fixed in the stator housing 1. The PCB circuit board 2 with the Hall chip, transmitting coil and receiving coil is placed in the first sub-housing 11, and the PCB circuit board 2 is fixed by four-point hot riveting. The PCB circuit board 2 and the end of the power pin extending into the first sub-housing 11 are electrically connected by soldering. Then, the cover plate 3 is fixed by laser welding to achieve sealing of the PCB circuit board 2.

[0037] The rotor 4 is formed by an insert integral injection molding method, and the rotor 4 has eddy current blades 41 and magnets 42, such as Figure 3-4 As described above, the rotor 4 is placed in the second sub-housing 12 , the step groove of the rotor 4 contacts the positioning block 43 , and the rotor 4 is movably engaged in the second sub-housing 12 via the buckle 44 .

[0038] When the sensor is used, the sensor is fixed in the car through the ear seat, and the connector 45 is connected to the rotating shaft of the car brake pedal, and the plug 14 is plugged into the central processor of the control system.

[0039] When the brake pedal is pressed, the rotating shaft of the pedal drives the rotor 4 to rotate through the connector 45. When the rotor 4 rotates, it drives the magnet 42 and the eddy current blade 41 to rotate simultaneously. At this time, the Hall chip on the PCB circuit board 2 will sense the change in magnetic field strength caused by the rotation of the magnet 42, thereby outputting a real-time position signal. At the same time, the transmitting coil on the PCB circuit board 2 will generate a magnetic field. When the magnetic field acts on the eddy current blade 41, it will generate a reverse eddy current on its surface. At the same time, this reverse eddy current will also generate a reverse magnetic field to offset the magnetic field generated by the transmitting coil. The receiving coil on the PCB circuit board 2 will receive magnetic fields of varying intensities as the eddy current blade 41 rotates, and then convert them into different voltage values ​​through the inside of the PCB circuit board 2, thereby outputting a real-time position signal.

[0040] Since these two output signals are based on different technical principles, the risk of simultaneous failure due to external interference is theoretically extremely low, which can effectively improve safety.

[0041] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A brake pedal position sensor for a brake-by-wire system, characterized in that: include: A stator housing (1), the stator housing (1) being an integrally formed injection molded part, the stator housing (1) comprising a square first sub-housing (11) and a cylindrical second sub-housing (12), with mounting ears (13) fixedly connected to the front, rear, and left sides of the second sub-housing (12); A PCB circuit board (2), the PCB circuit board (2) being fixed in the first sub-housing (11), and having a Hall chip, a transmitting coil, and a receiving coil attached to the PCB circuit board (2); a cover plate (3), wherein the cover plate (3) is fixed to the first sub-housing (11) by laser welding; A rotor (4) is rotatably connected to a second sub-housing (12), wherein eddy current blades (41) and magnets (42) are fixed in the rotor (4), wherein the centers of the rotor (4), the eddy current blades (41), and the magnets (42) coincide, and the eddy current blades (41) and the magnets (42) are fixed in the rotor (4) by means of an insert integral injection molding.

2. The brake pedal position sensor of a brake-by-wire system according to claim 1, characterized in that: The rotor (4) is in a step shape, a positioning block (43) is fixedly connected to a position corresponding to the step groove of the rotor (4) in the second sub-housing (12), and buckles (44) are evenly fixedly connected to the bottom circumference of the second sub-housing (12), and the rotor (4) is movably clamped in the second sub-housing (12) via the buckles (44).

3. The brake pedal position sensor of a brake-by-wire system according to claim 1, characterized in that: The PCB circuit board (2) is fixed in the first sub-housing (11) by means of four-point hot riveting.

4. The brake pedal position sensor of a brake-by-wire system according to claim 1, characterized in that: A connector (45) is fixedly connected to the bottom of the rotor (4).

5. The brake pedal position sensor of a brake-by-wire system according to claim 1, characterized in that: A plug (14) is integrally formed on the right side of the stator housing (1), and an electrical connection pin (15) is fixed in the stator housing (1) by means of an insert integrally injection-molded. One end of the electrical connection pin (15) extends into the first sub-housing (11) to be electrically connected to the PCB circuit board (2), and the other end is located in the plug (14).

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