Parking mechanism of electronic mechanical brake and control method

Abstract

The invention discloses an electronic mechanical brake parking mechanism and a control method, and belongs to the field of vehicle braking, the electronic mechanical brake parking mechanism comprises a gear motor and braking calipers, a locking disc is fixed on a motor shaft of the gear motor, and an electromagnetic locking assembly is arranged at the position, corresponding to the locking disc, in a motor shell of the gear motor; a locking head of the electromagnetic locking assembly corresponds to a locking hole formed in the locking disc, a parking position sensor is arranged in the motor shell, and a magnet matched with the parking position sensor is fixed to the end face side of the locking disc. A locking position sensor is further arranged in the motor shell and used for detecting advancing and retreating actions of the locking head, the locking position sensor and the parking position sensor are both electrically connected with the controller, and the controller is electrically connected with the speed reduction motor. The electronic mechanical brake parking mechanism and the control method have the advantages of more reliable control, shorter parking time, short noise duration and the like, so that the electronic mechanical brake maintenance cost and the use cost are lower, and the electronic mechanical brake parking mechanism is safer.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle braking, and particularly to an electromechanical brake parking mechanism and a control method thereof. Background Art

[0002] Most of the existing electromechanical braking devices adopt a ball screw drive structure. Since it cannot maintain self-locking through the friction of traditional screw nuts, it is necessary to add a set of electromagnetic control parking systems.

[0003] The existing electromechanical brake parking mechanisms are as follows: CN218598679U discloses a parking brake locking device, including an actuator housing, a transmission gear structure provided on the actuator housing, and a locking mechanism for locking the transmission gear structure for parking. When the vehicle performs a parking operation, the locking drive component is energized in the forward direction, the central shaft extends out to drive the locking mechanism to generate an axial displacement, and remains at the groove on the lower end face of the double gear, preventing the double gear from rotating towards the release end. The above parking structure has the following problems: The locking mechanism needs to bear a large torque at the position of the double gear. At the same time, there is a lack of position detection for the locking groove of the double gear, and it is impossible to ensure that the parking function is completed with one command. It is necessary to continuously fine-tune the angle of the double gear to insert into the locking groove. The reliability of the product is not high, resulting in an extended parking time, increased noise, and space waste, making it difficult to meet the strict requirements of the vehicle wheel end layout.

[0004] CN117905881A discloses a parking locking mechanism for an electromechanical brake actuator, including a locking component disposed inside the motor housing and a locking disc fixed on the drive shaft of the drive motor. By energizing the electromagnetic locking mechanism, the sliding iron core moves towards the first end magnet and enters the reserved position of the locking disc. The above structure has the following problems: Due to the lack of a motion detection component for the electromagnetic locking mechanism and an angle detection component for the locking disc, it is difficult to determine whether the parking function is completed, the control accuracy is low, the reliability is insufficient, and continuous noise is generated. Summary of the Invention

[0005] The purpose of the present invention is to provide an electromechanical brake parking mechanism and a control method to solve the above technical problems.

[0006] To achieve the above purpose, the present invention provides an electromechanical brake parking mechanism, including a reduction motor and a brake caliper connected to the output end of the reduction motor. A locking disc is fixed on the motor shaft of the reduction motor. An electromagnetic locking component is provided inside the motor housing of the reduction motor corresponding to the position of the locking disc. The locking head of the electromagnetic locking component corresponds to the locking hole opened on the locking disc. A parking position sensor is provided inside the motor housing, and a magnet cooperating with the parking position sensor is fixed on the side of the locking disc end face; A locking position sensor is also provided inside the motor housing for detecting the forward and backward movements of the locking head. Both the locking position sensor and the parking position sensor are electrically connected to the controller, and the controller is electrically connected to the reduction motor.

[0007] Preferably, an installation groove is formed on the motor housing near the locking disc, and the parking position sensor is positioned and installed inside the installation groove.

[0008] Preferably, a PCBA board is fixed inside the motor housing directly above the electromagnetic locking assembly. The controller is integrated on the PCBA board, and the controller also communicates with the vehicle controller; The parking position sensor includes a Hall sensor and a PIN pin electrically connected to the Hall sensor. The Hall sensor is electrically connected to the controller via the PIN pin.

[0009] Preferably, a locking position sensor is also integrated on the PCBA board, and the locking position sensor is directly above the locking head.

[0010] Preferably, two magnets are fixed at axially symmetrically arranged positions on the locking disc. Both magnets are cylindrical, and the magnets are fixed to the locking disc by interference press fitting or injection molding.

[0011] Preferably, the motor housing is made of aluminum alloy, and heat dissipation ribs and clamping and positioning grooves for fixture clamping are provided on the outer wall of the motor housing.

[0012] A control method for an electro-mechanical brake parking mechanism includes a braking control method and a release control method. The braking control method is as follows: When the controller receives a vehicle parking brake command issued by the vehicle controller, it controls the reduction motor to rotate forward to drive the brake caliper to clamp until a set clamping force is generated, then shuts down the drive motor. At the same time, it uses the parking position sensor to cooperate with the magnetic field intensity of the magnets on the locking disc to confirm the position of the locking disc, and feeds back the locking disc position signal to the controller. The controller controls the locking head of the electromagnetic locking assembly to extend and insert into the locking hole of the locking disc until the locking position sensor detects that the locking head is in place, and feeds back the locking head in-place signal to the controller to complete the braking; The release control method is as follows: When the controller receives a release command issued by the vehicle controller, the controller controls the locking head of the electromagnetic locking assembly to retract until the locking position sensor detects that the locking head is reset, and feeds back the locking head reset signal to the controller. The controller controls the reduction motor to rotate in the reverse direction to drive the brake caliper to open until it is reset to complete the release.

[0013] Preferably, using the parking position sensor and the magnetic field intensity of the magnet on the locking disc to confirm the position of the locking disc specifically includes the following steps: During the forward rotation of the reduction motor, the locking disc is driven to rotate synchronously, and the magnet rotates with the locking disc until the magnetic field generated by the magnet vertically passes through the Hall sensor, causing a potential difference proportional to the magnetic field intensity to be generated on both sides of the Hall sensor. When the set potential difference is detected, it is determined that the locking hole reaches the set position, and at this time, the locking hole is aligned with the locking head.

[0014] Therefore, the present invention adopts the above-mentioned electronic mechanical brake parking mechanism and control method, and the beneficial effects are as follows: 1. Improve reliability: By integrating the parking position sensor and the locking position sensor, the position of the locking disc and the movement of the locking head can be accurately detected, ensuring that the parking function can be completed with a single command, avoiding fine-tuning and noise problems; 2. Optimize space utilization: The compact structure design reduces space waste and meets the stringent requirements of the wheel end layout of the vehicle; 3. Enhance control accuracy: The controller communicates with the vehicle controller, and combines the feedback of the parking position sensor and the locking position sensor to achieve precise control, improving the overall performance and reliability of the parking system; 4. Improve heat dissipation performance: The motor housing is made of aluminum alloy material and is provided with heat dissipation ribs, effectively improving the heat dissipation performance and ensuring the long-term stable operation of the parking mechanism.

[0015] In summary, compared with the prior art, the present invention can accurately sense the position of the locking disc and the extension and retraction of the locking head of the electromagnetic locking component, avoiding the situation where the locking head does not advance into the locking hole of the locking disc due to the deviation of the locking disc position, which requires continuous operation of the electromagnetic locking component to advance, resulting in continuous structural impact, continuous noise and parking failure.

[0016] Next, through the drawings and embodiments, the technical solutions of the present invention will be further described in detail. Description of the Drawings

[0017] Figure 1 It is an assembly schematic diagram of an electronic mechanical brake parking mechanism described in the present invention; Figure 2 It is an installation schematic diagram of a parking position sensor of an electronic mechanical brake parking mechanism described in the present invention; Figure 3 It is a working principle diagram of a parking position sensor of an electronic mechanical brake parking mechanism described in the present invention; Figure 4 It is a braking and locking state diagram of an electronic mechanical brake parking mechanism described in the present invention; Figure 5The figure shows the release state of a parking mechanism of an electromechanical brake according to the present invention; Figure 6 The figure shows the external shape of a parking mechanism of an electromechanical brake according to the present invention.

[0018] Reference numerals 1. Reduction motor; 11. Installation groove; 2. Electromagnetic locking assembly; 21. Locking head; 3. Locking disc; 31. Locking hole; 4. Magnet; 5. Parking position sensor; 51. Hall sensor; 52. PIN pin; 6. PCBA board; 7. Brake caliper. Detailed implementation manners

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following further describes the embodiments of the present invention in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout.

[0020] It should be noted that the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or server that includes a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0021] The following describes the implementation manners of the present invention in detail with reference to the drawings.

[0022] As Figures 1-6 shown, an electromechanical brake parking mechanism includes a reduction motor 1 and a brake caliper 7 connected to the output end of the reduction motor 1. A locking disc 3 is fixed on the motor shaft of the reduction motor 1. An electromagnetic locking assembly 2 is provided inside the motor housing of the reduction motor 1 corresponding to the position of the locking disc 3. The locking head 21 of the electromagnetic locking assembly 2 corresponds to the locking hole 31 opened on the locking disc 3. A parking position sensor 5 is provided inside the motor housing. A magnet 4 cooperating with the parking position sensor 5 is fixed on the end face side of the locking disc 3; A locking position sensor is also provided inside the motor housing for detecting the forward and backward movements of the locking head 21. Both the locking position sensor and the parking position sensor 5 are electrically connected to a controller, and the controller is electrically connected to the reduction motor 1.

[0023] Specifically, an installation groove 11 is provided on the motor housing and near the locking disc 3, and the parking position sensor 5 is positioned and installed inside the installation groove 11. Inside the motor housing directly above the electromagnetic locking assembly 2, a PCBA board 6 is fixed. The PCBA board 6 is integrated with a controller, and the controller also communicates with the vehicle controller; the parking position sensor 5 includes a Hall sensor 51 and a PIN pin 52 electrically connected to the Hall sensor 51. The Hall sensor 51 is electrically connected to the controller via the PIN pin 52.

[0024] The PCBA board 6 is also integrated with a locking position sensor, and the locking position sensor is directly above the locking head 21.

[0025] Two magnets 4 are fixed at axially symmetrically arranged positions on the locking disc 3. The setting of the dual magnets 4 improves the positioning accuracy. Both magnets 4 are cylindrical, and the magnets 4 are fixed to the locking disc 3 by interference press-fitting or injection molding.

[0026] The motor housing is made of aluminum alloy, and heat dissipation ribs and clamping and positioning grooves for fixture clamping are provided on the outer wall of the motor housing.

[0027] A control method for an electro-mechanical brake parking mechanism includes a braking control method and a release control method. The braking control method is as follows: When the controller receives a vehicle parking brake command issued by the vehicle controller, it controls the reduction motor 1 to rotate forward, driving the brake caliper 7 to clamp until a set clamping force is generated, then shuts down the drive motor. At the same time, it uses the parking position sensor 5 to cooperate with the magnetic field intensity of the magnet 4 on the locking disc 3 to confirm the position of the locking disc 3, and feeds back the position signal of the locking disc 3 to the controller. The controller controls the locking head 21 of the electromagnetic locking assembly 2 to extend and insert into the locking hole 31 of the locking disc 3 until the locking position sensor detects that the locking head 21 is in place, and feeds back the in-place signal of the locking head 21 to the controller to complete the braking. Using the parking position sensor 5 to cooperate with the magnetic field intensity of the magnet 4 on the locking disc 3 to confirm the position of the locking disc specifically includes the following steps: During the forward rotation of the reduction motor 1, it drives the locking disc 3 to rotate synchronously, and the magnet 4 rotates with the locking disc until the magnetic field generated by the magnet 4 vertically passes through the Hall sensor 51, causing a potential difference proportional to the magnetic field intensity to be generated on both sides of the Hall sensor 51. When a set potential difference is detected, it is determined that the locking hole 31 reaches the set position, and at this time, the locking hole 31 is aligned with the locking head 21.

[0028] The release control method is as follows: When the controller receives a release command issued by the vehicle controller, the controller controls the locking head 21 of the electromagnetic locking assembly 2 to retract until the locking position sensor detects that the locking head 21 is reset, and feeds back the reset signal of the locking head 21 to the controller. The controller controls the reduction motor 1 to rotate in the reverse direction, driving the brake caliper 7 to open until it is reset to complete the release.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions of the present invention or make equivalent replacements, and these modifications or equivalent replacements do not make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An electromechanical brake parking mechanism, comprising a reduction motor and a brake caliper connected to the output end of the reduction motor. A locking disc is fixed on the motor shaft of the reduction motor. An electromagnetic locking component is arranged inside the motor housing of the reduction motor and at a position corresponding to the locking disc. The locking head of the electromagnetic locking component corresponds to a locking hole formed on the locking disc. It is characterized in that: A parking position sensor is arranged inside the motor housing, and a magnet cooperating with the parking position sensor is fixed on the end face side of the locking disc; A locking position sensor is also arranged inside the motor housing for detecting the forward and backward movements of the locking head. Both the locking position sensor and the parking position sensor are electrically connected to the controller, and the controller is electrically connected to the reduction motor.

2. The electronic-mechanical brake parking mechanism according to claim 1, wherein: An installation groove is formed in the motor housing near the locking disc, and the parking position sensor is positioned and installed inside the installation groove.

3. The electronic-mechanical brake parking mechanism according to claim 1, wherein: A PCBA board is fixed inside the motor housing directly above the electromagnetic locking assembly. The controller is integrated on the PCBA board, and the controller also communicates with the vehicle controller; The parking position sensor includes a Hall sensor and a PIN pin electrically connected to the Hall sensor. The Hall sensor is electrically connected to the controller via the PIN pin.

4. The electronic-mechanical brake parking mechanism according to claim 3, characterized in that: A locking position sensor is also integrated on the PCBA board, and the locking position sensor is directly above the locking head.

5. An electro-mechanical brake parking mechanism according to claim 1, characterized in that: Two magnets are fixed on the locking disc at axially symmetric positions. Both magnets are cylindrical, and the magnets are fixed on the locking disc by interference press fitting or injection molding.

6. The electronic and mechanical brake parking mechanism according to claim 1, characterized in that: The motor housing is made of aluminum alloy, and heat dissipation ribs and clamping and positioning grooves for fixture clamping are arranged on the outer wall of the motor housing.

7. The control method of the parking mechanism of the electromechanical brake according to any one of the above claims 1-6, characterized in that: It includes a braking control method and a release control method. The braking control method is as follows: When the controller receives the vehicle parking brake instruction sent by the vehicle controller, it controls the reduction motor to rotate forward, drives the brake caliper to clamp until a set clamping force is generated, shuts down the drive motor, and at the same time uses the magnetic field intensity of the magnet on the locking disc in cooperation with the parking position sensor to confirm the position of the locking disc, and feeds back the locking disc position signal to the controller. The controller controls the locking head of the electromagnetic locking assembly to extend and insert into the locking hole of the locking disc until the locking position sensor detects that the locking head is in place, and feeds back the locking head in-place signal to the controller to complete the braking; The release control method is as follows: When the controller receives the release instruction sent by the vehicle controller, the controller controls the locking head of the electromagnetic locking assembly to retract until the locking position sensor detects that the locking head is reset, and feeds back the locking head reset signal to the controller. The controller controls the reduction motor to rotate in the reverse direction, drives the brake caliper to open until it is reset to complete the release.

8. A control method for a parking mechanism of an electro-mechanical brake, according to claim 7, characterized in that: Using the magnetic field intensity of the magnet on the locking disc in cooperation with the parking position sensor to confirm the position of the locking disc specifically includes the following steps: During the forward rotation of the reduction motor, it drives the locking disc to rotate synchronously, and the magnet rotates with the locking disc until the magnetic field generated by the magnet vertically passes through the Hall sensor, causing a potential difference proportional to the magnetic field intensity to be generated on both sides of the Hall sensor. When a set potential difference is detected, it is determined that the locking hole reaches the set position, and at this time the locking hole is aligned with the locking head.

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