An EMT electrically motorized disengagement mechanism test system

Abstract

The application discloses an EMT electric disengagement mechanism test system, which comprises a driving circuit, a motor, a disengagement mechanism and a controller. The driving circuit is connected with the motor, the motor is connected with the disengagement mechanism, and the controller is connected with the driving circuit and the disengagement mechanism respectively and is configured to control the driving circuit to drive the motor to rotate forward or reversely, to make the disengagement mechanism perform a gear shifting action, to acquire a displacement amount of the gear shifting of the disengagement mechanism, and to judge whether the gear shifting of the disengagement mechanism is normal according to the displacement amount. The controller and the driving circuit can be used to directly control the disengagement mechanism to perform the gear shifting action and detect the gear shifting performance of the disengagement mechanism.

Description

Technical Field

[0001] This invention relates to automotive powertrain testing technology, and in particular to a testing system for an EMT (Electric Disengagement Mechanism). Background Technology

[0002] EMT (Electric Disengagement Mechanism) is a technical device that uses an electric actuator to separate and engage power transmission. Its core function is to disconnect power transmission under specific operating conditions to reduce mechanical resistance and improve system efficiency. It is commonly found in vehicle transmissions or electric four-wheel drive systems. In heavy-duty trucks or long-haul vehicles, electric disengagement is often used in multi-speed transmissions. When the vehicle is cruising at high speed, disengagement can reduce the load on the transmission system and reduce fuel consumption. At the same time, during gear shifting, a brief disengagement can achieve shock-free gear shifting and improve driving comfort. Therefore, there is an urgent need to develop a testing system to meet the requirements for testing EMT mechanisms. Summary of the Invention

[0003] This invention provides a testing system for an EMT (Electric Disengagement Mechanism) to meet the needs of testing EMT mechanisms.

[0004] This invention provides a test system for an EMT (Electrically Controlled Disengagement) mechanism, comprising: Drive circuit, motor, disengagement mechanism, controller; The drive circuit is connected to the motor, and the motor is connected to the disengagement mechanism; The controller is connected to the drive circuit and the disengagement mechanism respectively, and is configured to: The drive circuit controls the motor to rotate forward or reverse, causing the disengagement mechanism to perform a gear shifting action; Obtain the displacement amount of the disengagement mechanism during gear shifting, and determine whether the disengagement mechanism is shifting normally based on the displacement amount of the disengagement mechanism during gear shifting.

[0005] In some embodiments, controlling the drive circuit to drive the motor to rotate forward or reverse, causing the disengagement mechanism to perform a gear shifting action, includes: When the EMT output speed is within the first preset range, the controller controls the drive circuit to drive the motor to rotate forward or reverse, so that the disengagement mechanism performs a gear shifting action at a preset time. When the EMT output speed is not within the first preset range, the controller controls the drive circuit to stop.

[0006] In some embodiments, when the EMT output speed is within a first preset range, the controller controls the drive circuit to drive the motor to rotate forward or reverse, causing the disengagement mechanism to perform a gear shifting action at a preset time, including: When the EMT output speed is within the first preset range, the controller first controls the drive circuit to drive the motor to rotate forward, so that the disengagement mechanism performs the engagement action according to the first preset cycle; The controller then controls the drive circuit to drive the motor to reverse, so that the disengagement mechanism performs the disengagement action according to the second preset cycle.

[0007] In some embodiments, the first preset period is the sum of the power-off time and the engagement time after the disengagement mechanism completes disengagement; The second preset period is the sum of the engagement time of the disengagement mechanism, the power-off time while in the block, the disengagement time, and the power-off time after disengagement.

[0008] In some embodiments, obtaining the displacement amount of the disengagement mechanism during gear shifting and determining whether the disengagement mechanism is shifting normally based on the displacement amount of the disengagement mechanism during gear shifting includes: When the displacement of the disengagement mechanism during gear shifting is within a second preset range, the gear shifting of the disengagement mechanism is determined to be normal; otherwise, the gear shifting of the disengagement mechanism is determined to be abnormal.

[0009] In some embodiments, the driving circuit is an H-bridge circuit composed of two sets of switching device pairs, the control terminal of each set of switching device pairs is connected to the driving power supply and the controller, and the output terminal of each set of switching devices is connected to the motor.

[0010] In some embodiments, the first group of switching device pairs includes: A first solid-state relay, wherein the first pin of the first solid-state relay is connected to the controller, the second pin of the first solid-state relay is connected to the drive power supply, the third pin of the first solid-state relay is connected to the second group of switching devices and the motor respectively and grounded, and the fourth pin of the first solid-state relay is connected to the second group of switching devices; The second solid-state relay has a first pin connected to the controller, a second pin connected to the drive power supply, a third pin connected to the second group of switching devices, and a fourth pin connected to the second group of switching devices and the motor, respectively, and grounded.

[0011] In some embodiments, the second set of switching device pairs includes: The third solid-state relay has a first pin connected to the controller, a second pin connected to the drive power supply, a third pin connected to the third pin of the second solid-state relay, and a fourth pin connected to the third pin of the first solid-state relay and the motor, and grounded. The fourth solid-state relay has a first pin connected to the controller, a second pin connected to the drive power supply, a third pin connected to the fourth pin of the second solid-state relay and the motor respectively and grounded, and a fourth pin connected to the fourth pin of the first solid-state relay.

[0012] In some embodiments, the EMT electric disengagement mechanism test system further includes: The positive terminal of the load power supply is connected to the fourth pin of the first solid-state relay and the fourth pin of the fourth solid-state relay, respectively, and the negative terminal of the load power supply is connected to the third pin of the second solid-state relay and the third pin of the third solid-state relay, respectively.

[0013] In some embodiments, the EMT electric disengagement mechanism test system further includes: A first fuse is located between the fourth pin of the first solid-state relay and the load power supply. The second fuse is located between the fourth pin of the second solid-state relay and the motor; The third fuse is located between the fourth pin of the third solid-state relay and the motor; A fourth fuse is provided between the fourth pin of the fourth solid-state relay and the load power supply.

[0014] The beneficial effects of the technical solution provided by this invention include: This invention provides an EMT (Electric Disengagement Mechanism) testing system, comprising: a drive circuit, a motor, a disengagement mechanism, and a controller. The drive circuit is connected to the motor, and the motor is connected to the disengagement mechanism. The controller is connected to both the drive circuit and the disengagement mechanism, and is configured to: control the drive circuit to drive the motor to rotate forward or reverse, causing the disengagement mechanism to perform a shifting action; acquire the displacement amount of the disengagement mechanism during shifting; and determine whether the disengagement mechanism is shifting normally based on the displacement amount of the disengagement mechanism. This eliminates the need for pneumatic shifting control; the controller and drive circuit can directly control the disengagement mechanism to perform the shifting action and detect the shifting performance of the disengagement mechanism. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is an overall schematic diagram of an EMT electric disengagement mechanism test system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the starting gear shift provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the displacement amount of the disengagement mechanism during gear shifting provided in an embodiment of the present invention; Figure 4 A schematic diagram illustrating the synchronization time of the disengagement mechanism shifting according to an embodiment of the present invention; Figure 5 A timing diagram of the controller control drive circuit provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the displacement curve of the detached structure provided in an embodiment of the present invention; Figure 7 This is a partial view of the displacement curve of the detached structure provided in an embodiment of the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] This invention provides a testing system for an EMT (Electric Disengagement Mechanism) to meet the needs of testing EMT mechanisms.

[0019] Figure 1 This invention provides an EMT (Electric Disengagement Mechanism) testing system, comprising: a drive circuit, a motor, a disengagement mechanism, and a controller. The drive circuit is connected to the motor, and the motor is connected to the disengagement mechanism. The controller is connected to both the drive circuit and the disengagement mechanism, and is configured to: control the drive circuit to drive the motor to rotate forward or in reverse, causing the disengagement mechanism to perform a gear shifting action; acquire the displacement amount of the disengagement mechanism during gear shifting, and determine whether the disengagement mechanism is shifting normally based on the displacement amount of the disengagement mechanism during gear shifting.

[0020] The EMT (Electric Disengagement Mechanism) test system provided in this embodiment of the invention includes a drive circuit, a motor, a disengagement mechanism, and a controller. The drive circuit is connected to the motor, and the motor is connected to the disengagement mechanism. The controller is connected to both the drive circuit and the disengagement mechanism and is configured to: control the drive circuit to drive the motor to rotate forward or reverse, causing the disengagement mechanism to perform a shifting action; acquire the displacement amount of the disengagement mechanism during shifting; and determine whether the disengagement mechanism is shifting normally based on the displacement amount of the disengagement mechanism during shifting. The controller is a programmable logic controller (PLC), specifically a Siemens S7-200 PLC. When the controller controls the drive circuit to drive the motor to rotate forward, the disengagement mechanism performs an engaging action; when the controller controls the drive circuit to drive the motor to rotate in reverse, the disengagement mechanism performs a disengaging action. The controller and the drive circuit can directly control the disengagement mechanism to perform the shifting action and detect the shifting performance of the disengagement mechanism.

[0021] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 and Figure 2 As shown, controlling the drive circuit to drive the motor to rotate forward or reverse, causing the disengagement mechanism to perform a gear shifting action, includes: when the EMT output speed is within a first preset range, the controller controls the drive circuit to drive the motor to rotate forward or reverse, causing the disengagement mechanism to perform a gear shifting action for a preset time; when the EMT output speed is not within the first preset range, the controller controls the drive circuit to stop. The first preset range is 470rpm~530rpm, that is, when the EMT output speed is within 470rpm~530rpm, the controller controls the drive circuit to drive the motor to rotate forward or reverse, causing the disengagement mechanism to perform a gear shifting action for a preset time; when the EMT output speed is not within 470rpm~530rpm, the controller controls the drive circuit to stop.

[0022] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 and Figure 2As shown, when the EMT output speed is within a first preset range, the controller controls the drive circuit to drive the motor to rotate forward or reverse, causing the disengagement mechanism to perform a shifting action according to a preset time. This includes: when the EMT output speed is within the first preset range, the controller first controls the drive circuit to drive the motor to rotate forward, causing the disengagement mechanism to perform an engagement action according to a first preset cycle; then the controller controls the drive circuit to drive the motor to rotate in reverse, causing the disengagement mechanism to perform a disengagement action according to a second preset cycle. When the EMT output speed is within 470 rpm to 530 rpm, the controller first controls the drive circuit to drive the motor to rotate forward, causing the disengagement mechanism to perform a shifting action according to a preset time. In the first preset cycle, the engagement action is performed. Then, the controller controls the drive circuit to drive the motor to reverse, causing the disengagement mechanism to perform a disengagement action in the second preset cycle. Then, the controller controls the drive circuit to drive the motor to rotate forward, causing the disengagement mechanism to perform an engagement action in the first preset cycle. This cycle of controlling the motor to rotate forward or backward, and the disengagement mechanism to perform engagement or disengagement actions, facilitates the acquisition of the displacement amount of the disengagement mechanism during gear shifting. The controller determines whether the disengagement mechanism is shifting gears normally based on the displacement amount of the disengagement mechanism during gear shifting. The process continues until the test ends or the EMT output speed is not within the range of 470rpm~530rpm, at which point the controller controls the drive circuit to stop.

[0023] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 and Figure 5 As shown, the first preset period is the sum of the power-off time and the engagement time after the disengagement mechanism completes disengagement, and the second preset period is the sum of the engagement time, the power-off time in the block, the disengagement time, and the power-off time after disengagement of the disengagement mechanism.

[0024] Specifically, see Figure 5 and Figure 7As shown, the controller includes a delay timer T37, which controls the drive circuit to drive the motor to rotate forward, so that the time period for the disengagement mechanism to engage is the sum of the power-off time Tw after disengagement and the engagement time T+. The on time of the delay timer T37 is the engagement time T+ of the disengagement mechanism. The controller also includes a delay timer T38, which controls the drive circuit to drive the motor to rotate in reverse, so that the time period for the disengagement mechanism to disengage is the sum of the engagement time T+, the power-off time Tz, the disengagement time T-, and the power-off time Tw after disengagement. The on-time of delay timer T38 is the disengagement time T- of the disengagement mechanism. Delay timer T37 controls the energizing time of the disengagement mechanism during engagement and the duration of gear shifting. Delay timer T38 controls the energizing time of the disengagement mechanism during disengagement and the duration of gear shifting out, forming a complete gear shifting cycle. This achieves precise timing control of the engagement or disengagement actions of the disengagement mechanism. By precisely setting the timing control of the energizing and de-energizing times of each stage of gear shifting, the stability and reliability of the engagement and disengagement actions of the disengagement mechanism are ensured.

[0025] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 and Figure 3 As shown, the step of obtaining the displacement amount of the disengagement mechanism during gear shifting and determining whether the disengagement mechanism is shifting normally based on the displacement amount includes: when the displacement amount of the disengagement mechanism during gear shifting is within a second preset range, the disengagement mechanism is judged to be shifting normally; otherwise, the disengagement mechanism is judged to be shifting abnormally. The disengagement mechanism is equipped with a displacement sensor and connected to the controller to detect the displacement amount of the disengagement mechanism during gear shifting and feed it back to the controller. The second preset range is 14mm~18mm. When the displacement amount of the disengagement mechanism performing the engagement or disengagement action is within 14mm~18mm, the disengagement mechanism is judged to be shifting normally. When the displacement amount of the disengagement mechanism performing the engagement or disengagement action is not within 14mm~18mm, the disengagement mechanism is judged to be shifting abnormally. When the displacement amount of the disengagement mechanism performing the engagement or disengagement action is less than 14mm, the controller controls the drive circuit to stop, i.e., the test is stopped.

[0026] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1As shown, the drive circuit is an H-bridge circuit composed of two sets of switching device pairs. The control terminal of each set of switching device pairs is connected to the drive power supply and the controller, and the output terminal of each set of switching devices is connected to the motor. The drive power supply is also connected to the controller to supply power to the controller and the H-bridge circuit. The controller alternately controls the two sets of switching device pairs to turn on or off to switch the positive or negative pole of the motor power supply, thereby controlling the motor to rotate forward or backward, so that the disengagement mechanism performs engagement or disengagement actions. By using the H-bridge circuit to switch the positive and negative poles of the power supply instead of pneumatic control, the disengagement mechanism can be directly controlled to perform shifting actions and the shifting performance of the disengagement mechanism can be detected without using pneumatic shifting control.

[0027] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 As shown, the first group of switching devices includes: a first solid-state relay KF0 and a second solid-state relay KF2. The first pin of the first solid-state relay KF0 is connected to the controller, the second pin of the first solid-state relay KF0 is connected to the drive power supply, the third pin of the first solid-state relay KF0 is connected to the second group of switching devices and the motor respectively and grounded, and the fourth pin of the first solid-state relay KF0 is connected to the second group of switching devices; the first pin of the second solid-state relay KF2 is connected to the controller, the second pin of the second solid-state relay KF2 is connected to the drive power supply, the third pin of the second solid-state relay KF2 is connected to the second group of switching devices, and the fourth pin of the second solid-state relay KF2 is connected to the second group of switching devices and the motor respectively and grounded.

[0028] Specifically, when the EMT output speed is within 470rpm~530rpm, the controller outputs a high-level signal to the first pin of the first solid-state relay KF0 and the second solid-state relay KF2 according to the time period of the delay timer T37, so that the first solid-state relay KF0 and the second solid-state relay KF2 are turned on. Then the first solid-state relay KF0 and the second solid-state relay KF2 output positive 24V power to the motor to make the motor rotate forward. Then the disengagement mechanism performs the engagement action, and the duration is the sum of the power-off time Tw after disengagement and the engagement time T+.

[0029] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1As shown, the second set of switching devices includes: a third solid-state relay KF3 and a fourth solid-state relay KF1. The first pin of the third solid-state relay KF3 is connected to the controller, the second pin of the third solid-state relay KF3 is connected to the drive power supply, the third pin of the third solid-state relay KF3 is connected to the third pin of the second solid-state relay KF2, and the fourth pin of the third solid-state relay KF3 is connected to the third pin of the first solid-state relay KF0 and the motor, and grounded. The first pin of the fourth solid-state relay KF1 is connected to the controller, the second pin of the fourth solid-state relay KF1 is connected to the drive power supply, the third pin of the fourth solid-state relay KF1 is connected to the fourth pin of the second solid-state relay KF2 and the motor, and grounded. The fourth pin of the fourth solid-state relay KF1 is connected to the fourth pin of the first solid-state relay KF0.

[0030] Specifically, when the EMT output speed is between 470 rpm and 530 rpm, the controller outputs a high-level signal to the first pin of the first solid-state relay KF0 and the second solid-state relay KF2 according to the time period of delay timer T37, turning on the first solid-state relay KF0 and the second solid-state relay KF2. Then, the first solid-state relay KF0 and the second solid-state relay KF2 output a positive 24V power supply to the motor, causing the motor to rotate forward. The disengagement mechanism then performs an engagement action, and the duration is the sum of the power-off time Tw after disengagement and the engagement time T+. The controller then outputs a high-level signal to the first pin of the third solid-state relay KF3 and the fourth solid-state relay KF1 according to the time period of delay timer T38, turning on the third solid-state relay KF3 and the fourth solid-state relay KF1. Then, the third solid-state relay KF3 and the fourth solid-state relay KF1 output a negative 24V power supply to the motor, causing the motor to rotate in reverse. The disengagement mechanism then performs a disengagement action, and the duration is... The time period is the sum of the engagement time T+, the in-gear power-off time Tz, the disengagement time T-, and the power-off time Tw after disengagement. Then, the controller outputs a high-level signal to the first pin of the first solid-state relay KF0 and the second solid-state relay KF2 according to the time period of the delay timer T37 to control the disengagement mechanism to perform engagement action. This cycle controls the motor to rotate forward or reverse, so that the disengagement mechanism can perform engagement or disengagement action cyclically. This facilitates the acquisition of the displacement amount of the disengagement mechanism during gear shifting, and the controller determines whether the disengagement mechanism is shifting normally based on the displacement amount of the disengagement mechanism. The test continues until the end or the EMT output speed is not within 470rpm~530rpm, at which point the controller controls the drive circuit to stop. In addition, the first solid-state relay KF0, the second solid-state relay KF2, the third solid-state relay KF3, and the fourth solid-state relay KF1 are all 5~24VDC wide voltage constant current input and 40A field-effect transistor output, compatible with NPN or PNP bipolar junction transistor high and low level inputs.

[0031] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 As shown, the EMT electric disengagement mechanism test system further includes: a load power supply, the positive terminal of which is connected to the fourth pin of the first solid-state relay KF0 and the fourth pin of the fourth solid-state relay KF1, and the negative terminal of which is connected to the third pin of the second solid-state relay KF2 and the third solid-state relay KF3, respectively. The load power supply is used to power the disengagement mechanism and adjusts the 24V supply current according to the synchronization time of the disengagement mechanism (i.e., the actual time required for the displacement change of the disengagement mechanism to reach the target value during the gear shifting process) during the gear shifting action. (See [reference]) Figure 4 , Figure 6 and Figure 7 As shown, when the synchronization time is greater than the set time, it indicates that the gear shift is too slow. The load power supply increases the power supply current to the disengagement mechanism to accelerate the gear shifting action. When the synchronization time is less than the set time, it indicates that the gear shift is too fast. The load power supply decreases the power supply current to the disengagement mechanism. The power supply current is adjusted in real time by providing feedback on the synchronization time of the disengagement mechanism to make the gear shifting speed stably match the target. The synchronization time of the disengagement mechanism, i.e., the actual time of displacement response during the gear shifting action, is used as the feedback signal for closed-loop control to dynamically adjust the power supply current to optimize the gear shifting performance.

[0032] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 As shown, the EMT electric tripping mechanism test system further includes: a first fuse FU1, a second fuse FU2, a third fuse FU3, and a fourth fuse FU4. The first fuse FU1 is located between the fourth pin of the first solid-state relay KF0 and the load power supply; the second fuse FU2 is located between the fourth pin of the second solid-state relay KF2 and the motor; the third fuse FU3 is located between the fourth pin of the third solid-state relay KF3 and the motor; and the fourth fuse FU4 is located between the fourth pin of the fourth solid-state relay KF1 and the load power supply. The first fuse FU1, the second fuse FU2, the third fuse FU3, and the fourth fuse FU4 are all independent fuse protectors, used to provide independent overcurrent protection for each solid-state relay, preventing circuit overload from damaging the solid-state relay, preventing short circuits, overcurrents, and overloads at the load end, protecting the circuit. Furthermore, the four fuses are connected by direct-plug terminals for convenient and secure connection.

[0033] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0034] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A test system for an EMT (Electrically Controlled Disengagement) mechanism, characterized in that, include: Drive circuit, motor, disengagement mechanism, controller; The drive circuit is connected to the motor, and the motor is connected to the disengagement mechanism; The controller is connected to the drive circuit and the disengagement mechanism respectively, and is configured to: The drive circuit controls the motor to rotate forward or reverse, causing the disengagement mechanism to perform a gear shifting action; Obtain the displacement amount of the disengagement mechanism during gear shifting, and determine whether the disengagement mechanism is shifting normally based on the displacement amount of the disengagement mechanism during gear shifting.

2. The EMT electric disengagement mechanism test system according to claim 1, characterized in that, The control of the drive circuit to drive the motor to rotate forward or reverse, causing the disengagement mechanism to perform a gear shifting action, includes: When the EMT output speed is within the first preset range, the controller controls the drive circuit to drive the motor to rotate forward or reverse, so that the disengagement mechanism performs a gear shifting action at a preset time. When the EMT output speed is not within the first preset range, the controller controls the drive circuit to stop.

3. The EMT electric disengagement mechanism test system according to claim 2, characterized in that, When the EMT output speed is within a first preset range, the controller controls the drive circuit to drive the motor to rotate forward or reverse, causing the disengagement mechanism to perform a gear shifting action at a preset time, including: When the EMT output speed is within the first preset range, the controller first controls the drive circuit to drive the motor to rotate forward, so that the disengagement mechanism performs the engagement action according to the first preset cycle; The controller then controls the drive circuit to drive the motor to reverse, so that the disengagement mechanism performs the disengagement action according to the second preset cycle.

4. The EMT electric disengagement mechanism test system according to claim 3, characterized in that: The first preset period is the sum of the power-off time and the engagement time after the disengagement mechanism completes disengagement; The second preset period is the sum of the engagement time of the disengagement mechanism, the power-off time while in the block, the disengagement time, and the power-off time after disengagement.

5. The EMT electric disengagement mechanism test system according to claim 1, characterized in that, The step of obtaining the displacement amount of the disengagement mechanism during gear shifting, and determining whether the disengagement mechanism is shifting normally based on the displacement amount of the disengagement mechanism during gear shifting, includes: When the displacement of the disengagement mechanism during gear shifting is within a second preset range, the gear shifting of the disengagement mechanism is determined to be normal; otherwise, the gear shifting of the disengagement mechanism is determined to be abnormal.

6. The EMT electric disengagement mechanism test system according to claim 1, characterized in that: The drive circuit is an H-bridge circuit composed of two sets of switching device pairs. The control terminal of each set of switching device pairs is connected to the drive power supply and the controller, and the output terminal of each set of switching devices is connected to the motor.

7. The EMT electric disengagement mechanism test system according to claim 6, characterized in that, The first group of switching devices includes: A first solid-state relay, wherein the first pin of the first solid-state relay is connected to the controller, the second pin of the first solid-state relay is connected to the drive power supply, the third pin of the first solid-state relay is connected to the second group of switching devices and the motor respectively and grounded, and the fourth pin of the first solid-state relay is connected to the second group of switching devices; The second solid-state relay has a first pin connected to the controller, a second pin connected to the drive power supply, a third pin connected to the second group of switching devices, and a fourth pin connected to the second group of switching devices and the motor, respectively, and grounded.

8. The EMT electric disengagement mechanism test system according to claim 7, characterized in that, The second group of switching devices includes: The third solid-state relay has a first pin connected to the controller, a second pin connected to the drive power supply, a third pin connected to the third pin of the second solid-state relay, and a fourth pin connected to the third pin of the first solid-state relay and the motor, and grounded. The fourth solid-state relay has a first pin connected to the controller, a second pin connected to the drive power supply, a third pin connected to the fourth pin of the second solid-state relay and the motor respectively and grounded, and a fourth pin connected to the fourth pin of the first solid-state relay.

9. The EMT electric disengagement mechanism test system according to claim 8, characterized in that, Also includes: The positive terminal of the load power supply is connected to the fourth pin of the first solid-state relay and the fourth pin of the fourth solid-state relay, respectively, and the negative terminal of the load power supply is connected to the third pin of the second solid-state relay and the third pin of the third solid-state relay, respectively.

10. The EMT electric disengagement mechanism test system according to claim 9, characterized in that, Also includes: A first fuse is provided between the fourth pin of the first solid-state relay and the load power supply. The second fuse is located between the fourth pin of the second solid-state relay and the motor; The third fuse is located between the fourth pin of the third solid-state relay and the motor; A fourth fuse is provided between the fourth pin of the fourth solid-state relay and the load power supply.

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