An AMT test bench driving motor control system

Abstract

The utility model provides a kind of AMT test bench drive motor control system, applied to AMT test technical field, including first gearbox controller, second gearbox controller, motor frequency converter, drive motor and multi-node synchronous feedback collection backplane module, drive motor is electrically connected with motor frequency converter, drive motor is connected with AMT gearbox shaft;Multi-node synchronous feedback collection backplane module is connected with AMT gearbox, motor frequency converter, first gearbox controller, second gearbox controller respectively;Multi-node synchronous feedback collection backplane module includes main CAN transceiver and multiple isolated CAN output unit, and each isolated CAN output unit is connected with corresponding gearbox controller respectively.The system significantly enhances data consistency and bus reliability at hardware level, can effectively ensure the accuracy and repeatability of gear quality evaluation, closed-loop control test and complex working condition simulation.

Description

Technical Field

[0001] This utility model belongs to the field of AMT testing technology, specifically relating to an AMT test bench drive motor control system. Background Technology

[0002] Automatic mechanical transmission (AMT) test benches are used to simulate the operating conditions of a vehicle's powertrain in a laboratory environment for the development and verification of transmission control strategies. To accurately reproduce vehicle operating conditions, test benches typically employ motor-driven power loading to the transmission, enabling testing of shifting behavior under different operating conditions, verification of actuator responses, and calibration of control functions. The control quality of the drive motor in the test bench directly affects the impact of shifting processes, synchronization accuracy, and the ability to reproduce test conditions; therefore, high requirements are placed on the real-time performance, stability, and interactive synchronization of the motor control.

[0003] In existing technologies, most AMT test benches employ a single controller structure, where the transmission controller is simultaneously responsible for issuing control commands for speed and torque, as well as parsing and responding to motor status information. However, this architecture cannot simulate the interaction between the engine ECU and the transmission TCU in a real vehicle, making it difficult to guarantee the consistency of control logic. Furthermore, in current test benches, the feedback signal from the motor inverter is typically sent directly back to the controller via a single-channel CAN communication method. When the test bench needs to add multiple control units, monitoring nodes, or data logging functions, the bus load easily increases, communication latency differences widen, and multiple control nodes receive feedback data asynchronously, reducing the realism of the test and potentially leading to misjudgments.

[0004] In addition, the existing motor feedback signal loop lacks effective hardware isolation and automatic impedance matching mechanisms. When a node falls off or the line becomes loose, it can easily cause abnormal bus electrical characteristics, thereby interrupting all communication. At the same time, the electromagnetic interference at the test site is strong, and the structure without shielding and isolation design cannot guarantee the long-term stable operation of the system.

[0005] Therefore, how to construct a data distribution and isolation module with multi-node synchronous feedback capability, high bus reliability, and scalable structure has become a key direction for improving the control accuracy and reliability of AMT test benches. Utility Model Content

[0006] In view of the above-mentioned problems in the prior art, the purpose of this utility model is to provide an AMT test bench drive motor control system that significantly enhances data consistency and bus reliability at the hardware level, and can effectively ensure the accuracy and repeatability of shift quality evaluation, closed-loop control testing and complex working condition simulation.

[0007] An AMT test bench drive motor control system includes: The controller unit includes a first gearbox controller and a second gearbox controller; The drive execution unit includes a motor inverter and a drive motor, wherein the drive motor is electrically connected to the motor inverter and the drive motor is connected to the AMT gearbox shaft; The multi-node synchronous feedback acquisition backplane module is connected to the AMT gearbox, motor inverter, first gearbox controller, and second gearbox controller, respectively. The multi-node synchronous feedback acquisition backplane module includes a main CAN transceiver, a synchronous distribution bus, and multiple isolated CAN output units. Each isolated CAN output unit is connected to the corresponding gearbox controller. The synchronous distribution bus adopts an equal-length wiring structure, so that the feedback signal returned by the motor inverter is output to the multiple isolated CAN output units in a synchronous manner.

[0008] Preferably, each of the multiple isolated CAN output units includes an optocoupler isolation circuit and an independent isolated power supply module.

[0009] Preferably, the multi-node synchronous feedback acquisition backplane module is equipped with an automatic terminating resistor switching circuit, which is used to automatically switch the CAN bus terminating resistor according to the connection status of the isolated CAN output unit.

[0010] Preferably, the multi-node synchronous feedback acquisition backplane module is provided with a metal shielding housing, and a grounding terminal is provided on the outside of the metal shielding housing.

[0011] Preferably, the multi-node synchronous feedback acquisition backplane module is equipped with status indicator lights to display the communication status of each isolated CAN output unit.

[0012] Preferably, the first gearbox controller and the second gearbox controller are fixedly mounted on the multi-node synchronous feedback acquisition backplane module via plug-in connectors.

[0013] Preferably, the motor frequency converter is connected to the main CAN transceiver via a CAN communication bus.

[0014] The beneficial effects of this utility model are as follows: The AMT test bench drive motor control system, by setting up a multi-node synchronous feedback acquisition backplane module, enables the actual speed, torque and working status of the drive motor to be distributed synchronously in real time at the hardware level among multiple control nodes. Structurally, it ensures that the acquisition of feedback signals by the first gearbox controller TCU1 and the second gearbox controller TCU2 is completely synchronized in terms of time delay and signal consistency, which significantly improves the response consistency and transmission accuracy under the condition of dual controller collaboration.

[0015] By employing differential pair equal-length wiring and optocoupler isolation design, electrical coupling interference between nodes can be effectively avoided during signal distribution, improving the operational stability of the control system in high electromagnetic noise environments and ensuring communication quality during long-term durability testing.

[0016] The automatic termination resistor switching circuit inside the backplane module can automatically match the CAN bus impedance in real time according to the node connection status, avoiding network communication abnormalities caused by node plugging / unplugging or loose wiring, thereby greatly reducing the risk of system downtime.

[0017] The modular plug-in structure not only facilitates quick replacement and debugging of the controller TCU, but also gives the system excellent expandability, allowing flexible connection to external nodes such as sensors or data logging units to cover a wider range of test scenarios. Meanwhile, intuitive communication status indicator lights enable rapid location of bus faults and node anomalies, improving test efficiency and maintenance convenience.

[0018] This invention can significantly enhance data consistency and bus reliability at the hardware level without modifying existing experimental algorithms. It can effectively ensure the accuracy and repeatability of shift quality evaluation, closed-loop control testing, and complex working condition simulation, and has both structural rationality and engineering application promotion value. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a system block diagram of this utility model; Figure 2 This is a schematic diagram of the control process of this utility model. Detailed Implementation

[0020] Example 1 like Figure 1 As shown, an AMT test bench drive motor control system includes a controller unit, a drive execution unit, and a multi-node synchronous feedback acquisition backplane module. The multi-node synchronous feedback acquisition backplane module is connected to the controller unit and the drive execution unit via a CAN bus.

[0021] The controller unit consists of a first gearbox controller TCU1 and a second gearbox controller TCU2. Both are installed in the control cabinet of the test bench and are fixedly connected to the multi-node synchronous feedback acquisition backplane module through a plug-in interface. The plug-in interface has a guide groove, elastic buckle and anti-vibration pressure plate structure to ensure the stability of electrical connection under the vibration environment of the test bench.

[0022] The drive execution unit includes a motor inverter and a drive motor. The motor inverter and drive motor are electrically connected, and the drive motor is connected to the AMT gearbox via a coupling. The motor inverter has an internal CAN communication port, which is used to receive speed and torque control parameters from the second gearbox controller TCU2, and to transmit the actual response status of the drive motor back to the communication bus in real time at a fixed period of approximately 2ms.

[0023] The multi-node synchronous feedback acquisition backplane module enhances the real-time consistency and control stability of multi-node signal transmission. This module includes a main CAN transceiver, a synchronous distribution bus, and multiple isolated CAN output units. The feedback signal returned by the motor inverter first enters the main CAN transceiver unit, and then is simultaneously transmitted to multiple isolated CAN output units through the synchronous distribution bus with differential pairs of equal-length wiring located inside the backplane. This allows the first gearbox controller TCU1 and the second gearbox controller TCU2 to acquire status information such as the actual motor speed, actual torque, and operating mode with almost identical physical delays, thereby significantly improving the synchronous decision-making capability of the dual gearbox controllers TCUs under cooperative control conditions.

[0024] To further enhance signal integrity, each isolated CAN output unit is equipped with an optocoupler isolation circuit and an independent isolation power supply module to effectively eliminate interference coupling between controllers and prevent CAN bus collapse caused by the failure of any controller.

[0025] Meanwhile, to prevent network communication anomalies caused by impedance mismatch due to missing nodes, an automatic terminating resistor switching circuit is configured inside the backplane. When a transmission controller TCU is detected not being inserted, the circuit will automatically connect a terminating resistor to maintain normal network operation; when a node is connected, the terminating resistor will automatically disconnect, without the need for manual adjustment.

[0026] The backplate is equipped with an integrated metal electromagnetic shielding shell, and the outer wall of the shell is equipped with a reliable grounding terminal, which can suppress high-power disturbances from the drive motor and motor inverter. At the same time, status indicator lights are arranged on the outside of the backplate to display the communication status, error status and terminal resistor working status in real time, which can facilitate the test personnel to quickly locate the fault.

[0027] like Figure 2As shown, during device operation, the first gearbox controller TCU1 issues a speed or torque request based on test requirements. The second gearbox controller TCU2 parses the request and sends the control command to the motor inverter. The actual response returned by the motor inverter after execution is synchronously distributed to the first gearbox controller TCU1 and the second gearbox controller TCU2 via the multi-node synchronous feedback acquisition backplane module. This allows both controllers to simultaneously determine and adjust the control accuracy and dynamic deviation in a closed loop without relying on a complex software scheduling and synchronization mechanism. This improves the bench control accuracy, shortens the shift test time, and enhances the stability and safety of the test process.

[0028] By configuring an independent multi-node synchronous feedback acquisition backplane module between the dual controllers and the drive execution unit, the device can maintain stable and reliable signal synchronous transmission and hardware fault tolerance in strong interference motor testing scenarios. At the same time, it achieves advantages such as node scalability, rapid maintenance and automatic impedance matching, which has significant engineering practical value and promotion significance.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A drive motor control system for an AMT test bench, characterized in that, include: The controller unit includes a first gearbox controller and a second gearbox controller; The drive execution unit includes a motor inverter and a drive motor, wherein the drive motor is electrically connected to the motor inverter and the drive motor is connected to the AMT gearbox shaft; The multi-node synchronous feedback acquisition backplane module is connected to the AMT gearbox, motor inverter, first gearbox controller, and second gearbox controller, respectively. The multi-node synchronous feedback acquisition backplane module includes a main CAN transceiver, a synchronous distribution bus, and multiple isolated CAN output units. Each isolated CAN output unit is connected to the corresponding gearbox controller. The synchronous distribution bus adopts an equal-length wiring structure, so that the feedback signal returned by the motor inverter is output to the multiple isolated CAN output units in a synchronous manner.

2. The AMT test bench drive motor control system according to claim 1, characterized in that, Each of the multiple isolated CAN output units includes an optocoupler isolation circuit and an independent isolated power supply module.

3. The AMT test bench drive motor control system according to claim 1, characterized in that, The multi-node synchronous feedback acquisition backplane module is equipped with an automatic terminating resistor switching circuit, which is used to automatically switch the CAN bus terminating resistor according to the connection status of the isolated CAN output unit.

4. The AMT test bench drive motor control system according to claim 1, characterized in that, The multi-node synchronous feedback acquisition backplane module is equipped with a metal shielding housing, and a grounding terminal is provided on the outside of the metal shielding housing.

5. The AMT test bench drive motor control system according to claim 1, characterized in that, The multi-node synchronous feedback acquisition backplane module is equipped with status indicator lights to display the communication status of each isolated CAN output unit.

6. The AMT test bench drive motor control system according to claim 1, characterized in that, The first gearbox controller and the second gearbox controller are fixedly mounted on the multi-node synchronous feedback acquisition backplane module via plug-in connectors.

7. The AMT test bench drive motor control system according to claim 1, characterized in that, The motor frequency converter is connected to the main CAN transceiver via a CAN communication bus.

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