Integrated LIN / CAN communication stepping motor and air outlet actuator applying same

Abstract

The utility model discloses an integrated LIN / CAN communication stepping motor and an air outlet actuator using the same, the stepping motor comprises a driving control circuit board and a stepping motor body, the driving control circuit board is provided with a control unit integrally installed on the driving control circuit board, and the stepping motor body is provided with an air inlet and an air outlet. The control unit comprises a motor controller, a voltage conversion circuit, an LIN / CAN transceiver and a motor driving H-bridge group, the vehicle end controller is connected with one end of the motor controller through the voltage conversion circuit and the LIN / CAN transceiver, the other end of the motor controller is connected with the motor driving H-bridge group, the driving control circuit board is integrally installed on the stepping motor body, and the driving control circuit board is connected with the motor driving H-bridge group. The air outlet actuator adopts the integrated stepping motor. According to the utility model, the LIN / CAN transceiver is integrated on the driving control circuit board, and the driving control circuit board is integrated on the stepping motor body, so that a traditional external controller and a cable are omitted, and the space is greatly saved.

Description

Technical Field

[0001] This utility model relates to the field of distributed electronic system control technology in automobiles using LIN communication networks, and particularly to an integrated LIN / CAN communication stepper motor and an air outlet actuator using it. Background Technology

[0002] In the current automotive electronics industry, especially in the field of air vent or duct control in interior parts, actuators with claw-pole stepper motors are large in size and have low integration. They typically use a drive control circuit board to control the motor, and then transmit the motor's rapid rotation to the actuator spline through a mechanical gear reduction transmission structure. This has disadvantages such as large size, low stability, and high cost.

[0003] Furthermore, in the home appliance industry, similar products can only receive PWM pulse width modulation signals to respond to functional requirements, making them unsuitable for applications in the automotive industry that communicates via LIN / CAN buses. Additionally, the motor drive modules of similar products use PWM subdivision constant current to generate current timing sequences for curved current wave drive, resulting in complex current feedback regulation loops that are difficult to adjust. Summary of the Invention

[0004] This application provides an integrated LIN / CAN communication stepper motor and an air outlet actuator using it. The LIN / CAN transceiver is integrated into the drive control circuit board, which is also integrated into the stepper motor body, eliminating the need for traditional external controllers and cables, thus saving a significant amount of space.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a stepper motor with integrated LIN / CAN communication, comprising:

[0006] The drive control circuit board includes a control unit integrated into it. The control unit includes a motor controller, a voltage conversion circuit that converts the voltage provided by the vehicle controller to the voltage level required by the motor controller to achieve voltage control of the motor controller, a LIN / CAN transceiver that receives LIN / CAN signals from the vehicle controller and transmits them to the motor controller, and a motor drive H-bridge assembly that controls the operating speed and torque of the motor controller. The vehicle controller is connected to one end of the motor controller through the voltage conversion circuit and the LIN / CAN transceiver, and the other end of the motor controller is connected to the motor drive H-bridge assembly.

[0007] The stepper motor body and the drive control circuit board are integrated and mounted on the stepper motor body.

[0008] As an improvement, LIN communication is compatible with LIN 2.0 / 2.1 / 2.2A and SAE2602 protocols, while CAN communication is compatible with CAN 1.0 / 2.0 and CAN FD protocols.

[0009] As an improvement, the drive control circuit board also includes a register integrated on the drive control circuit board for storing information data about the operating status of the stepper motor.

[0010] As an improvement, the control signals of the motor controller include, but are not limited to, the position, speed, direction, and mode of the stepper motor, and the status signals read by the motor controller include, but are not limited to, the position, speed, direction, mode, and error messages of the stepper motor.

[0011] As an improvement, the stepper motor body includes a motor driven by voltage mode or current mode in accordance with the corresponding microstepping and decay mode.

[0012] As an improvement, the motor drive H-bridge includes a PWM frequency generator for outputting four PWM signals according to the motor controller control instructions, a PWM pulse width modulator for modulating the pulse width of the four PWM signals according to the motor controller control instructions, and a MOS transistor driver connected to the PWM pulse width modulator to drive the four modulated PWM signals to output continuously increasing or continuously decreasing PWM subdivision constant current drive signals.

[0013] As an improvement, the voltage conversion circuit is connected to the vehicle controller via a power protection circuit, and the LIN / CAN transceiver is connected to the vehicle controller via a signal line protection circuit.

[0014] As an improvement, an air outlet actuator employs a stepper motor with integrated LIN / CAN communication, as described above.

[0015] Compared with the prior art, the advantages of this utility model are:

[0016] The control unit (including motor controller, voltage converter, LIN / CAN transceiver, and motor drive H-bridge group) is integrated on the drive control circuit board, which is directly integrated on the stepper motor body. The motor and drive control circuit board are integrated into one unit, eliminating the need for traditional external controllers and wiring harnesses, saving a lot of space. It is suitable for space-sensitive scenarios such as vehicle or small equipment, while improving EMC performance and reducing radiation.

[0017] The internal functional modules of the control unit (such as power supply, communication, and drive) are highly integrated, which simplifies the circuit layout, improves signal transmission efficiency, and facilitates mass production and fault diagnosis.

[0018] Communication with the vehicle network is achieved through LIN or CAN communication interfaces. After the control unit receives the LIN / CAN signal, it correctly parses the LIN / CAN signal. If the actuator operation signal is received, it switches to the stepper motor control PWM signal to control the motor drive H-bridge group so that the stepper motor runs at the corresponding speed and torque, so that the vehicle can directly monitor the actuator operation status and drive the actuator to run.

[0019] The built-in voltage conversion circuit can adapt to a wide range of input voltages from the vehicle end, stably outputting the voltage required by the motor controller, ensuring stable operation of the motor under power fluctuations or complex operating conditions.

[0020] An external signal line protection circuit is added to enable LIN / CAN to meet the OEM's EMC emission requirements such as RE, voltage method, current method, and anti-interference requirements such as DCC, CCC, ESD, etc. At the same time, the signal protection circuit can ensure that the OEM's consistency requirements are met.

[0021] The motor is driven in different driving modes with corresponding microstepping and attenuation modes so that the phase current acting on the stepper motor is as close to the sine wave as possible, and the ripple component on the sine wave is minimized. The current is proportional to the torque. The smaller the harmonic components and ripple of the current, the smaller the torque fluctuation can be, thereby achieving the goal of minimizing motor commutation jitter and noise. Attached Figure Description

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0023] Figure 1 A schematic diagram of a stepper motor with integrated LIN / CAN communication and an exhaust actuator module using it.

[0024] Figure 2 A schematic diagram of a stepper motor with integrated LIN / CAN communication and an exhaust actuator using it for control;

[0025] Figure 3 This is a schematic diagram of the 2-2 phase excitation sequence of a stepper motor with integrated LIN / CAN communication.

[0026] Figure 4 This is a schematic diagram of the current waveform of a stepper motor with integrated LIN / CAN communication.

[0027] Figure 5 This is a schematic diagram of the phase voltage waveform of a stepper motor using integrated LIN / CAN communication. Detailed Implementation

[0028] In this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "planar direction", "circumferential", 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 this utility model and simplifying the description, and are not intended to indicate or imply that the device 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 this utility model.

[0029] like Figures 1 to 5 As shown, an integrated LIN / CAN communication stepper motor includes a drive control circuit board and a stepper motor body. The drive control circuit board has a control unit integrated on it. The control unit includes a motor controller, a voltage conversion circuit that converts the voltage provided by the vehicle controller to the voltage level required by the motor controller to achieve voltage control of the motor controller, a LIN / CAN transceiver for receiving LIN / CAN signals from the vehicle controller and transmitting the LIN / CAN signals to the motor controller, and a motor drive H-bridge assembly that controls the operating speed and torque of the motor controller. The vehicle controller is connected to one end of the motor controller through the voltage conversion circuit and the LIN / CAN transceiver, and the other end of the motor controller is connected to the motor drive H-bridge assembly. The drive control circuit board is integrated on the stepper motor body.

[0030] LIN communication is compatible with LIN 2.0 / 2.1 / 2.2A and SAE2602 protocols, while CAN communication is compatible with CAN 1.0 / 2.0 and CAN FD protocols.

[0031] The drive control circuit board also includes registers integrated on the drive control circuit board for storing information data about the operating status of the stepper motor.

[0032] The control signals of the motor controller include, but are not limited to, the position, speed, direction, and mode of the stepper motor. The status signals read by the motor controller include, but are not limited to, the position, speed, direction, mode, and error messages of the stepper motor.

[0033] The stepper motor body includes a motor driven by voltage mode or current mode under corresponding microstepping and decay modes. Preferably, the microstepping includes 16 microsteps, 32 microsteps, 64 microsteps, 128 microsteps, and 256 microsteps, and the decay modes include fast decay mode, slow decay mode, and mixed decay mode.

[0034] The motor drive H-bridge assembly includes a PWM frequency generator for outputting four PWM signals according to the control instructions of the motor controller, a PWM pulse width modulator for modulating the pulse width of the four PWM signals according to the control instructions of the motor controller, and a MOS transistor driver connected to the PWM pulse width modulator to drive the four modulated PWM signals to output continuously increasing or continuously decreasing PWM subdivision constant current drive signals.

[0035] The voltage conversion circuit is connected to the vehicle controller via the power protection circuit, and the LIN / CAN transceiver is connected to the vehicle controller via the signal line protection circuit.

[0036] An air outlet actuator employs a stepper motor with integrated LIN / CAN communication as described above.

[0037] The control unit, consisting of a motor controller, voltage conversion circuit, LIN / CAN transceiver, and motor drive H-bridge assembly, along with registers, is integrated and mounted on the drive control circuit board. The registers are connected to one end of the motor controller, as are the voltage conversion circuit and LIN / CAN transceiver. One end of the PWM frequency generator, PWM pulse width modulator, and MOSFET driver is connected to the other end of the motor controller. One end of the PWM pulse width modulator is also connected to the other end of the PWM frequency generator, and the other end of the PWM pulse width modulator is connected to the other end of the MOSFET driver. The drive control circuit board is integrated and mounted on the stepper motor body, so that the other end of the MOSFET driver is connected to the stepper motor body to drive the motor. The vehicle-side controller is connected to the other end of the voltage conversion circuit through a power protection circuit and to the other end of the LIN / CAN transceiver through a signal line protection circuit.

[0038] After receiving the LIN / CAN signal, the control unit correctly parses the LIN / CAN signal. If an actuator operation signal is received, it switches to stepper motor control PWM signal to control the motor drive H-bridge group so that the stepper motor runs at the corresponding speed and torque. When parsing the LIN / CAN signal, the control unit only processes the signals related to the address of this actuator to ensure that the actuator does not respond incorrectly in the whole vehicle system. The control unit can receive or process signals with different scheduling cycles to be suitable for different scheduling cycles of the whole vehicle.

[0039] The motor drive section allows for the selection of different drive modes, such as voltage mode and current mode, based on motor L and R parameters, noise and vibration requirements. Different microstepping levels, such as 16, 32, 64, 128, and 256 microstepping, and different decay modes, such as fast decay, slow decay, and hybrid decay, can be selected within each drive mode to minimize stepper motor noise and vibration. The comprehensive consideration of various drive modes, microstepping levels, and decay methods aims to ensure that the phase current acting on the stepper motor is as close to a sine wave as possible, with minimal ripple components on the sine wave. Since current is proportional to torque, the smaller the harmonic components and ripple of the current, the smaller the torque fluctuations, thus minimizing motor commutation jitter and noise.

[0040] Commutation detection from phase A to phase B can determine whether the rotor has reached the commutation critical point by detecting the reverse electromotive force (EMF) value of the MOS on the H bridge arm. By smoothing and filtering the commutation back EMF, the accurate magnitude of the back EMF can be obtained, the accurate commutation point can be determined, smooth commutation can be achieved, and rotor running vibration can be reduced.

[0041] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the technical solution of the present invention, or the direct application of the concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. An integrated LIN / CAN communication stepper motor, characterized by, The application relates to a step motor with integrated LIN / CAN communication. The drive control circuit board is integrated on the step motor body. The LIN communication is compatible with LIN 2.0 / 2.1 / 2.2A protocol and SAE2602 protocol, and the CAN communication is compatible with CAN 1.0 / 2.0 and CAN FD protocol.

2. The integrated LIN / CAN communication stepper motor according to claim 1, characterized in that: The drive control circuit board further comprises a register integrated on the drive control circuit board for storing information data of the working state of the step motor.

3. The integrated LIN / CAN communication stepper motor of claim 1, wherein: The control signals of the motor controller include but are not limited to the position, speed, direction and mode of the step motor, and the state signals read by the motor controller include but are not limited to the position, speed, direction, mode and error of the step motor.

4. The integrated LIN / CAN communication stepper motor according to claim 3, characterized in that: The step motor body comprises a motor driven by voltage mode or current mode under corresponding subdivision number and attenuation mode.

5. The integrated LIN / CAN communication stepper motor of claim 1, wherein: The motor drive H-bridge group comprises a PWM frequency generator for outputting four-way PWM signals according to the control instruction of the motor controller, a PWM pulse width modulator for modulating the pulse width of the four-way PWM signals according to the control instruction of the motor controller, and a MOS tube driver connected with the PWM pulse width modulator to drive the MOS tube driver according to the four-way modulated PWM signals so as to output continuous increment or continuous decrement PWM subdivision constant current driving signals.

6. The integrated LIN / CAN communication stepper motor of claim 1, wherein: The voltage conversion circuit is connected with the vehicle end controller through a power supply protection circuit, and the LIN / CAN transceiver is connected with the vehicle end controller through a signal line protection circuit.

7. The integrated LIN / CAN communication stepper motor of claim 1, wherein: The application relates to a step motor with integrated LIN / CAN communication.

8. An air outlet actuator, characterized by: The drive control circuit board is integrated on the step motor body. The LIN communication is compatible with LIN 2.0 / 2.1 / 2.2A protocol and SAE2602 protocol, and the CAN communication is compatible with CAN 1.0 / 2.0 and CAN FD protocol. The drive control circuit board further comprises a register integrated on the drive control circuit board for storing information data of the working state of the step motor. The control signals of the motor controller include but are not limited to the position, speed, direction and mode of the step motor, and the state signals read by the motor controller include but are not limited to the position, speed, direction, mode and error of the step motor. The step motor body comprises a motor driven by voltage mode or current mode under corresponding subdivision number and attenuation mode. The motor drive H-bridge group comprises a PWM frequency generator for outputting four-way PWM signals according to the control instruction of the motor controller, a PWM pulse width modulator for modulating the pulse width of the four-way PWM signals according to the control instruction of the motor controller, and a MOS tube driver connected with the PWM pulse width modulator to drive the MOS tube driver according to the four-way modulated PWM signals so as to output continuous increment or continuous decrement PWM subdivision constant current driving signals. The voltage conversion circuit is connected with the vehicle end controller through a power supply protection circuit, and the LIN / CAN transceiver is connected with the vehicle end controller through a signal line protection circuit. The application relates to a step motor with integrated LIN / CAN communication.

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