New energy four-wheel drive vehicle disconnectable mechanism position acquisition method, disconnect method and system

Abstract

This invention provides a method, method, and system for obtaining the position of a disconnectable mechanism in a new energy four-wheel drive vehicle, thereby improving position accuracy and reliability. The method for obtaining the position of the disconnectable mechanism includes: obtaining the initial position of the disconnectable mechanism; rotating the disengagement motor of the disconnectable mechanism according to the initial position, and obtaining the number of Hall signals generated when the disengagement motor rotates; and determining the position of the disconnectable mechanism according to the number of Hall signals. This invention can improve position accuracy and reliability, and reduce costs.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and in particular to a method, system, and storage medium for obtaining the location of a disconnectable mechanism in a new energy four-wheel drive vehicle. Background Technology

[0002] The development and application of new energy vehicles has become a hot topic in the automotive industry. Currently, the power systems of new energy vehicles are primarily electric drive systems. To improve overall vehicle performance, some vehicles will adopt four-wheel drive, meaning at least two power systems, with at least one of the front or rear wheels driven by an electric motor to increase power.

[0003] In certain operating conditions (such as climbing hills, high-throttle acceleration, and slippery surfaces), four-wheel drive is required. However, in other conditions (such as low speed, low load, and congested urban traffic), single-wheel drive mode is sufficient for customer driving needs. In these single-wheel drive scenarios, the gears in the reduction gearbox rotate with the wheels, resulting in a certain drag torque, which reduces the overall efficiency of the drive system and thus affects the driving range. This is especially true for permanent magnet synchronous motors, which may require zero-torque control in single-wheel drive conditions. At high speeds, this results in a significant current draw (Id), additionally consuming the vehicle's battery energy and further reducing the driving range. If single-wheel drive mode could be used in these conditions, disconnecting one of the electric drive shafts, the overall efficiency of the electric drive system could be improved, thereby increasing the vehicle's driving range.

[0004] Current disconnection mechanisms generally employ synchronizer or electromagnetic engagement methods. A position sensor is typically needed to determine whether the mechanism is in the disconnected or engaged position and transmit this information in real-time to the electric drive system or the entire vehicle. No torque is output when disconnected, but torque is output when engaged. Some disconnection mechanisms may use linear displacement sensors, which are more expensive and have limited accuracy. Summary of the Invention

[0005] In view of this, the present invention provides a method, a disconnection method and system for obtaining the position of a disconnectable mechanism in a new energy four-wheel drive vehicle, so as to improve position accuracy and reliability and reduce costs.

[0006] This invention first provides a method for obtaining the position of a disconnectable mechanism in a new energy four-wheel drive vehicle, comprising: obtaining the initial position of the disconnectable mechanism; rotating the disengagement motor of the disconnectable mechanism according to the initial position, and obtaining the number of Hall signals generated when the disengagement motor rotates; and determining the position of the disconnectable mechanism according to the number of Hall signals.

[0007] Optionally, the step of obtaining the initial position of the disconnection mechanism includes: obtaining the number of first Hall signals generated by the disconnection motor during a first rotation process along a first direction, wherein the disconnection motor drives the disconnection mechanism, and the first rotation process stops when the disconnection motor reaches a stall current threshold; and determining, based on the number of first Hall signals, that the initial position of the disconnection mechanism is either in a disconnected position or a connected position.

[0008] Optionally, the step of rotating the disengagement motor of the disconnection mechanism according to the initial position and obtaining the number of Hall signals generated when the disengagement motor rotates includes: when the disconnection mechanism is in the disconnection position, determining the number of second Hall signals corresponding to the disconnection mechanism based on the number of first Hall signals; when the disconnection mechanism is in the engagement position, causing the disengagement motor to perform a second rotation process in a second direction opposite to the first direction, and stopping the second rotation process when the disengagement motor reaches the stall current threshold, obtaining the number of third Hall signals generated during the second rotation process, obtaining the number of fourth Hall signals corresponding to the disconnection mechanism based on the number of first Hall signals and the number of third Hall signals; and obtaining the number of fifth Hall signals generated when the disconnection mechanism moves between the disconnection position and the engagement position.

[0009] Optionally, the step of determining the position of the disconnection mechanism based on the number of Hall signals includes: determining the position of the disconnection mechanism based on the number of the fourth Hall signal, the number of the second Hall signal, and the number of the fifth Hall signal.

[0010] Optionally, the step of determining whether the initial position of the disconnecting mechanism is in the disconnected position or the engaged position based on the number of the first Hall signals includes: determining the angle of the disengagement motor based on the number of the first Hall signals; determining that the initial position of the disconnecting mechanism is in the disconnected position when the absolute value of the angle of the disengagement motor is less than a first threshold; otherwise, determining that the initial position of the disconnecting mechanism is in the engaged position.

[0011] Optionally, the step of determining the angle of the disengagement motor based on the number of the first Hall signals includes: calculating the angle of the disengagement motor according to the formulas B=Kb and A=0-b*x when the initial position of the disengagement mechanism is in the disengagement position; and calculating the angle of the disengagement motor according to the formulas B=K+b and A=0+b*x when the initial position of the disengagement mechanism is in the engagement position; wherein B represents the number of Hall signals, K represents the initial value of the number of Hall signals, b represents the number of Hall signals generated during the rotation of the disengagement motor, x represents the angle of the disengagement motor when each Hall signal is measured, and A represents the angle of the disengagement motor.

[0012] Optionally, the step of obtaining the initial position of the disconnecting mechanism includes: if the initial position of the disconnecting mechanism is in the disconnected position, then resetting the number of Hall signals B to K and the angle A of disengaging the motor to 0.

[0013] The present invention also provides a method for disconnecting a disconnectable mechanism in a new energy four-wheel drive vehicle, comprising: acquiring a vehicle power demand signal, the vehicle power demand signal including a disconnection signal and a connection signal of the disconnection mechanism; acquiring the initial position of the disconnection mechanism; rotating the disengagement motor of the disconnection mechanism according to the initial position and the vehicle power demand signal, acquiring the number of Hall signals generated when the disengagement motor rotates; and controlling the disconnection mechanism to connect or disconnect according to the number of Hall signals.

[0014] Optionally, the vehicle power demand signal may further include the speed and torque signals of the disconnection mechanism; the step of controlling the engagement or disengagement of the disconnection mechanism based on the number of Hall signals may further include: controlling the speed and torque of the disconnection mechanism when it engages or disengages by using the number of Hall signals generated by the disconnection motor.

[0015] The present invention further provides a system for obtaining the position of a disconnectable mechanism in a new energy four-wheel drive vehicle, including a disconnectable mechanism and a controller. The disconnectable mechanism includes: a disengagement motor, which obtains a torque demand signal from the vehicle controller and outputs a disengagement torque; a reduction mechanism, including a multi-stage reducer, the input end of which is connected to the disengagement motor and the output end of which is connected to a disengagement assembly; and a disengagement assembly, the input end of which is connected to the reduction mechanism and the output end of which is connected to a synchronizer assembly, which outputs or cuts off power to the synchronizer assembly according to the torque demand; the controller executes any of the above methods.

[0016] The present invention provides a method, method and system for obtaining the position of a disconnectable mechanism in a new energy four-wheel drive vehicle. It uses Hall signals collected by BLDC to replace general sensors for detecting position or displacement, which can save certain costs and provide relatively high position accuracy. In addition, the elimination of position sensors reduces wiring harnesses and detection circuits, improves reliability, and also reduces the space required for the gearbox. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the method for obtaining the position of the disconnectable mechanism in a new energy four-wheel drive vehicle according to the present invention.

[0019] Figure 2 yes Figure 1 Detailed diagrams of some of the steps.

[0020] Figure 3 yes Figure 1 A detailed diagram of another part of the steps.

[0021] Figure 4 This is a schematic diagram illustrating the principle of calculating the total stroke of the disconnecting mechanism based on the total number of rotations of the disconnecting motor BLDC.

[0022] Figure 5 This demonstrates the control principle of disengaging the motor.

[0023] Figure 6 yes Figure 2 Detailed diagrams of some of the steps.

[0024] Figure 7 This is a schematic diagram of the disconnection method of the disconnectable mechanism of the new energy four-wheel drive vehicle of the present invention.

[0025] Figure 8 This is a schematic diagram of the system for obtaining the position of the disconnectable mechanism in a new energy four-wheel drive vehicle according to the present invention.

[0026] Figure 9 This is another schematic diagram of the system for obtaining the position of the disconnectable mechanism of the new energy four-wheel drive vehicle according to the present invention.

[0027] Figure 10 This is another schematic diagram of the new energy four-wheel drive vehicle disconnectable mechanism position acquisition system of the present invention.

[0028] Figure 11 This is a schematic diagram of the control flow of the system for obtaining the position of the disconnectable mechanism in the new energy four-wheel drive vehicle of the present invention. Detailed Implementation

[0029] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. Based on the description of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0030] In the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms based on the specific circumstances. The terms "first," "second," "third," etc., are merely used to distinguish elements with similar properties and do not indicate or imply relative importance or a specific order.

[0031] First Embodiment

[0032] This embodiment provides a method for obtaining the location of a detachable mechanism in a new energy four-wheel drive vehicle. Please refer to [link / reference]. Figure 1 ,include:

[0033] Step S20: Obtain the initial position of the disconnection mechanism;

[0034] Before engaging or disengaging, it is necessary to determine the actual position of the engaging or disengaging mechanism to determine which direction the mechanism needs to turn. During the engaging or disengaging action, it is also necessary to output the corresponding torque based on the real-time position, and when the final engaging or disengaging position is reached, it is necessary to determine whether the engaging or disengaging has been completed.

[0035] Step S40: Based on the initial position, rotate the disengagement motor of the disconnection mechanism and obtain the number of Hall signals generated when the disengagement motor rotates;

[0036] The number of Hall signals includes at least three values: the number of Hall signals output when the disconnecting mechanism reaches the disconnecting position; the number of Hall signals output when the disconnecting mechanism reaches the engaging position; and the number of Hall signals output when the disconnecting mechanism moves between the disconnecting position and the engaging position.

[0037] Step S60: Determine the position of the disconnection mechanism based on the number of Hall signals.

[0038] This invention uses Hall signals acquired by BLDC (Boll-Diameter Integrated Circuit) instead of conventional position or displacement sensors, which saves costs and provides higher position accuracy, improving vibration and torque shock during engagement and disengagement. Furthermore, eliminating the position sensor reduces wiring and detection circuitry, improving reliability and saving space in the gearbox.

[0039] For details, please refer to Figure 2 The step of obtaining the initial position of the disconnection mechanism, i.e., step S20, may include:

[0040] Step S22: Obtain the number of first Hall signals generated by the disengagement motor during the first rotation process along the first direction. The disengagement motor drives the disconnection mechanism. The rotation process stops when the disengagement motor reaches the stall current threshold.

[0041] Determining whether the engagement / disengagement mechanism has reached the engagement or disengagement point is primarily achieved by monitoring the BLDC motor's current to determine if it has reached the stall current threshold. Regardless of whether the disengagement mechanism reaches the engagement or disengagement point, the stall current value will rise to a very high level.

[0042] Step S24: Determine whether the initial position of the disconnection mechanism is in the disconnection position or the engagement position based on the number of the first Hall signals.

[0043] For details, please refer to Figure 3 The step of rotating the disengagement motor of the disconnection mechanism according to the initial position and obtaining the number of Hall signals generated when the disengagement motor rotates, i.e., step S40, may include:

[0044] Step S42: When the disconnecting mechanism is in the disconnected position, the number of second Hall signals corresponding to the disconnecting mechanism is determined according to the number of first Hall signals;

[0045] Step S43: When the disconnecting mechanism is in the engaged position, the disengagement motor performs a second rotation process in a second direction opposite to the first direction, and stops the second rotation process when the disengagement motor reaches the stall current threshold. The number of third Hall signals generated during the second rotation process is obtained, and the number of fourth Hall signals corresponding to the disconnecting mechanism is obtained based on the number of first Hall signals and the number of third Hall signals.

[0046] Step S44: Obtain the number of fifth Hall signals generated when the disconnection mechanism moves between the disconnection position and the engagement position.

[0047] Accordingly, the step of determining the position of the disconnection mechanism based on the number of Hall signals, i.e., step S60, includes: step S62, determining the position of the disconnection mechanism based on the number of the fourth Hall signal, the number of the second Hall signal, and the number of the fifth Hall signal.

[0048] Please refer to Figure 4 When the disconnecting mechanism reaches the engagement or disengagement point, the disengagement motor can no longer rotate. The disengagement motor 20 is preferably a BLDC (Brushless Direct Current) motor. Therefore, the total number of rotations of the BLDC motor is the actual total stroke of the disconnecting mechanism. By calculating the total angle of rotation of the BLDC motor or the number of Hall signals generated, the actual position of the disconnecting mechanism can be calculated.

[0049] Figure 5 This diagram illustrates the control principle of disengaging the motor. In the diagram, HA, HB, and HC represent the three acquisition terminals of the Hall signal, U, V, and W represent the three-phase lines of the BLDC motor, and Iu, Iv, and Iw represent the low-frequency current signals of the three-phase AC power.

[0050] Second Embodiment

[0051] Please refer to Figure 6 The difference between this embodiment and the first embodiment is that the step of determining whether the initial position of the disconnection mechanism is in the disconnection position or the engagement position based on the number of the first Hall signals, i.e., step S24, includes:

[0052] Step S242: Determine the angle of disengagement from the motor based on the number of first Hall signals;

[0053] Step S244: When the absolute value of the angle of disengagement from the motor is less than the first threshold, it is determined that the initial position of the disconnection mechanism is in the disconnection position; otherwise, it is determined that the initial position of the disconnection mechanism is in the engagement position. The range of the first threshold can be 180 to 220, preferably 200.

[0054] By using the number of Hall signals to determine the initial position of the disconnecting mechanism, and simultaneously using the angle to determine the initial position of the disconnecting mechanism, the results can be mutually verified to ensure accuracy.

[0055] Third Embodiment

[0056] This embodiment provides a method for disconnecting a disconnectable mechanism in a new energy four-wheel drive vehicle. (See reference...) Figure 7 ,include:

[0057] Step S30: Obtain the vehicle power demand signal, which includes a disconnection mechanism disconnection signal and a disconnection mechanism engagement signal;

[0058] Step S50: Obtain the initial position of the disconnection mechanism;

[0059] Step S70: Based on the initial position and the vehicle power demand signal, rotate the disconnection motor of the disconnection mechanism, and obtain the number of Hall signals generated when the disconnection motor rotates;

[0060] Step S90: Control the disconnection mechanism to engage or disengage based on the number of Hall signals.

[0061] During power-on initialization, the current absolute position of the engagement / disengagement mechanism is obtained through the BLDC motor's stall mechanism, and the angle and Hall signal at this time are recorded. During engagement and disengagement, the position of the engagement / disengagement mechanism is calculated in real time based on the initial position by counting the Hall signals of the BLDC motor, and the mechanism is controlled to engage or disengage. In this way, when there is a request for disengagement or engagement, a certain strategy can be implemented based on the real-time confirmed actual position of the disengagement structure during the movement, which can reduce the impact during the disengagement or engagement process and avoid torque shock and vibration during gear shifting.

[0062] Fourth embodiment

[0063] The difference between this embodiment and the third embodiment is that the vehicle power demand signal also includes the speed and torque signals of the disconnection mechanism; the step of controlling the engagement or disengagement of the disconnection mechanism according to the number of Hall signals, i.e., step S90, includes: step S92, controlling the speed and torque of the disconnection mechanism when it engages or disengages by the number of Hall signals generated by the disconnection motor.

[0064] Fifth Embodiment

[0065] Please refer to Figure 8 , Figure 9 and Figure 10 This embodiment provides a system for obtaining the position of a disconnectable mechanism in a new energy four-wheel drive vehicle, including a disconnectable mechanism 100 and a controller 10. The disconnectable mechanism 100 includes a disconnect motor 20, a reduction mechanism 40, and a disconnect component 60. The disconnect motor 20 outputs a Hall signal. The disconnect motor 20 obtains a torque demand signal from the controller 10 and outputs a disconnect torque. The controller 10 can be a vehicle controller. The reduction mechanism 40 includes a multi-stage reducer, with its input end connected to the disconnect motor 20 and its output end connected to the disconnect component 60. The input end of the disconnect component 60 is connected to the reduction mechanism 40, and its output end is connected to a synchronizer assembly 50. Based on the torque demand, the synchronizer assembly 50 outputs or cuts off power from the drive motor 30. The controller 10 executes any of the above-described methods for obtaining the position of the disconnectable mechanism or for disconnection.

[0066] The multi-stage reducer includes a first-stage reducer 42 and a second-stage reducer 44 connected in series. The input end of the first-stage reducer 42 is connected to the disengagement motor 20. The two-stage reducer allows each stage to be relatively small, thus occupying less space and making better use of the vehicle's interior space. The disengagement assembly 60 may include a shift drum 62 and a shift fork 64. Through the groove on the shift drum 62, when the shift drum 62 rotates, it pushes the shift fork 64 to move, thereby causing the synchronizer ring 52 on the synchronizer assembly 50 to move left and right. This engages or disengages the intermediate shaft 72 of the synchronizer assembly 50, achieving the disengagement or engagement of the synchronizer assembly 50, cutting off or transmitting power to the wheels 74. The disengagement assembly 60 can also be implemented in other ways, such as with a hydraulic clutch, ECVT, or other gearbox designs, which will not be elaborated here.

[0067] Alternatively, the mechanical scheme for the BLDC motor to drive the engagement / disengagement mechanism can be as follows: the BLDC motor connects to a gear, the gear connects to a camshaft, and then pushes the shift fork to achieve lateral movement of the mechanism; or the BLDC motor directly connects to a worm gear, driving the shift fork to achieve lateral movement. The core component of the engagement / disengagement mechanism can be a synchronizer or a gearbox. In other words, the core component of the disengagement mechanism here can be a synchronizer or a gearbox. The engagement / disengagement mechanism can be located on the input shaft, intermediate shaft, or output shaft of the reducer assembly.

[0068] After the mechanical structure of the disengagement mechanism is determined, the total stroke of the shift hub is a fixed value L. Once the gear ratios and other parameters are also determined, the total number of rotations n of the BLDC motor from the disengagement position to the engagement position can be calculated. After the BLDC motor selection is determined, the number of pole pairs of the BLDC motor is P. Therefore, the Hall signal for one rotation of the BLDC is 6*P. The angle A of the BLDC from the disengagement position to the engagement position can be calculated as A = 360*n. During BLDC operation, each measured Hall signal represents an angle x = 360 / 6 / P, meaning the minimum control accuracy can reach x degrees. The total number of Hall signals N for one rotation of the BLDC from the disengagement position to the engagement position is N = A / x.

[0069] Please refer to Figure 11 When initializing the vehicle's low-voltage power-on, the number of Halls (B) can be initialized to 1000, and the BLDC angle (A) can be initialized to 0.

[0070] Next, the software controls the BLDC motor to reverse (towards the disconnect position) and records the number of first Hall signals b1 during the BLDC reversal.

[0071] During operation, the values ​​of A and B are calculated in real time: B = 1000 - b1; A = 0 - b1 * x.

[0072] When the current reaches the stall current threshold, it indicates that the BLDC has stalled and can no longer rotate, indicating that it is already in the disconnect position. Record the number of second Hall signals generated at this time. Determine whether the angle of A is within ±200 degrees. If the absolute value of the angle of A is less than 200 degrees, it indicates that the initial position of the disconnect mechanism is in the disconnect position. If the absolute value of the angle of A is greater than 200 degrees, it indicates that the initial position of the disconnect mechanism is in the engagement position.

[0073] If the initial position of the disengagement mechanism is in the disengagement position, the number of Halls B is reset to 1000, and the BLDC angle A is reset to 0. Based on the current number of Halls B being 1000 and the current BLDC angle being 0, it is determined to be in the disengagement position, and the current disengagement position is fed back to the whole vehicle, that is, the disengagement mechanism completes the initialization.

[0074] If the initial position of the disengagement mechanism is in the engagement position, the BLDC motor is first controlled to rotate forward, and the number of Halls b2 is accumulated in real time. The values ​​of A and B are calculated in real time: B = 1000 + b2; A = 0 + b2 * x. When the current reaches the stall threshold, it means that the BLDC has stalled and can no longer rotate, indicating that it has reached the engagement point and returned to the initial position. The number of third Hall signals generated at this time is recorded. Moreover, the current Hall count B is 1000 + b2, and the current BLDC angle is b2 * x. The current engagement position is fed back to the whole vehicle, that is, the disengagement mechanism completes the initialization.

[0075] Based on the number of the first and third Hall signals, the corresponding number of the fourth Hall signals generated when the disconnecting mechanism moves from the disconnected position to the engaged position can be obtained. Thus, the vehicle can be controlled based on the number of the fifth Hall signals generated as the disconnecting mechanism moves between the disconnected and engaged positions. After the disengagement mechanism completes initialization, the disconnection or engagement action is executed according to the actual needs of the vehicle. During this process, the number of Hall signals and the BLDC angle are calculated in real time, and the speed / torque of the disconnecting mechanism is precisely controlled based on the current BLDC angle.

[0076] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0077] This invention uses Hall signals acquired by a BLDC motor to replace conventional position or displacement sensors, saving costs and providing higher position accuracy. Furthermore, eliminating the position sensor reduces wiring and detection circuitry, improving reliability and freeing up space for the gearbox. When the engagement / disengagement mechanism reaches the engagement or disengagement point, the BLDC motor stops rotating. Therefore, the total number of rotations of the BLDC motor represents the actual total stroke of the disengagement mechanism. By calculating the total angle of the BLDC rotation or the number of Hall signals generated, the actual position of the disengagement mechanism can be calculated. Determining whether the engagement / disengagement mechanism has reached the engagement or disengagement point is primarily achieved by monitoring the BLDC motor current and checking if the stall current threshold has been reached. During power-on initialization, the current absolute position of the engagement / disengagement mechanism is obtained through the BLDC motor's stall condition, and the angle and Hall signals at this point are recorded. During engagement and disengagement, the position of the engagement / disengagement mechanism is calculated in real-time based on the initial position by counting the BLDC motor Hall signals, controlling the engagement or disengagement of the mechanism.

[0078] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A method for acquiring the position of a disconnectable mechanism of a new energy four-wheel drive vehicle, characterized by, The method comprises the following steps: acquiring an initial position of the disconnecting mechanism, comprising: acquiring a first number of Hall signals generated by the disconnecting motor during a first rotation process in a first direction, the disconnecting motor driving the disconnecting mechanism, the first rotation process stopping when the disconnecting motor reaches a locked-rotor current threshold; determining, according to the first number of Hall signals, that the initial position of the disconnecting mechanism is at a disconnecting position or a connecting position; rotating the disconnecting motor of the disconnecting mechanism according to the initial position, and acquiring a number of Hall signals generated when the disconnecting motor rotates, comprising: when the disconnecting mechanism is at the disconnecting position, determining, according to the first number of Hall signals, a second number of Hall signals corresponding to the disconnecting mechanism; when the disconnecting mechanism is at the connecting position, making the disconnecting motor perform a second rotation process in a second direction opposite to the first direction, and stopping the second rotation process when the disconnecting motor reaches the locked-rotor current threshold, and acquiring a third number of Hall signals generated during the second rotation process; acquiring a fourth number of Hall signals corresponding to the disconnecting mechanism according to the first number of Hall signals and the third number of Hall signals; acquiring a fifth number of Hall signals generated when the disconnecting mechanism moves between the disconnecting position and the connecting position; determining the position of the disconnecting mechanism according to the number of Hall signals.

2. The method according to claim 1, wherein The step of determining the position of the disconnecting mechanism according to the number of Hall signals comprises determining the position of the disconnecting mechanism according to the fourth number of Hall signals, the second number of Hall signals and the fifth number of Hall signals.

3. The method of claim 1, wherein, The step of determining, according to the first number of Hall signals, that the initial position of the disconnecting mechanism is at the disconnecting position or the connecting position comprises: determining the angle of the disconnecting motor according to the first number of Hall signals; when the absolute value of the angle of the disconnecting motor is less than a first threshold, determining that the initial position of the disconnecting mechanism is at the disconnecting position, otherwise, determining that the initial position of the disconnecting mechanism is at the connecting position.

4. The method according to claim 3, wherein The step of determining the angle of the disconnecting motor according to the first number of Hall signals comprises: when the initial position of the disconnecting mechanism is at the disconnecting position, calculating the angle of the disconnecting motor according to the formula B=K-b and A=0-b*x; when the initial position of the disconnecting mechanism is at the connecting position, calculating the angle of the disconnecting motor according to the formula B=K+b and A=0+b*x; wherein B represents the number of Hall signals, K represents the initial value of the number of Hall signals, b represents the number of Hall signals generated during the rotation process of the disconnecting motor, x represents the angle of the disconnecting motor running when each Hall signal is measured, and A represents the angle of the disconnecting motor.

5. The method of claim 4, wherein, The step of acquiring the initial position of the disconnecting mechanism comprises: if the initial position of the disconnecting mechanism is at the disconnecting position, resetting the number of Hall signals B to K and resetting the angle A of the disconnecting motor to 0.

6. A disconnecting method of the disconnectable mechanism of the new energy four-wheel drive vehicle according to the new energy four-wheel drive vehicle disconnectable mechanism position acquisition method according to any one of claims 1 to 5, characterized by, The method comprises the following steps: acquiring a vehicle power demand signal, the vehicle power demand signal comprising a disconnecting mechanism disconnecting signal and a disconnecting mechanism connecting signal; acquiring an initial position of the disconnecting mechanism; According to the initial position and the vehicle power demand signal, the disengagement motor of the disconnecting mechanism is rotated, and the number of Hall signals generated when the disengagement motor is rotated is obtained; According to the number of Hall signals, the disconnecting mechanism is controlled to be combined or disconnected.

7. The disconnecting method of the disconnecting mechanism of the new energy four-wheel drive vehicle according to claim 6, characterized in that: The vehicle power demand signal further comprises a speed and torque signal of the disconnecting mechanism; The step of controlling the disconnecting mechanism to be combined or disconnected according to the number of Hall signals further comprises controlling the speed and torque of the disconnecting mechanism when the disconnecting mechanism is combined or disconnected according to the number of Hall signals generated by the disengagement motor.

8. A new energy four-wheel drive vehicle disconnecting mechanism position acquisition system comprising a disconnecting mechanism (100) and a controller (10), characterized in that: The disconnecting mechanism comprises: a disengagement motor (20) that obtains a torque demand signal from the controller and outputs a disengagement torque; a speed reduction mechanism (40) comprising a multi-stage speed reducer, an input end of the multi-stage speed reducer being connected to the disengagement motor (20), and an output end being connected to a disengagement assembly (60); and a disengagement assembly (60) connected to the speed reduction mechanism (40) at an input end and connected to a synchronizer assembly (50) at an output end, the synchronizer assembly (50) outputting or cutting off power according to the torque demand; The controller executes the new energy four-wheel drive vehicle disconnecting mechanism position acquisition method according to any one of claims 1 to 5.

9. A new energy four-wheel drive vehicle disconnecting mechanism position acquisition system comprising a disconnecting mechanism (100) and a controller (10), characterized in that: The disconnecting mechanism comprises: a disengagement motor (20) that obtains a torque demand signal from the controller and outputs a disengagement torque; a speed reduction mechanism (40) comprising a multi-stage speed reducer, an input end of the multi-stage speed reducer being connected to the disengagement motor (20), and an output end being connected to a disengagement assembly (60); and a disengagement assembly (60) connected to the speed reduction mechanism (40) at an input end and connected to a synchronizer assembly (50) at an output end, the synchronizer assembly (50) outputting or cutting off power according to the torque demand; The controller executes the disconnecting method of the new energy four-wheel drive vehicle disconnecting mechanism according to claim 6 or 7.

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