Automobile electronic expansion valve control device

Abstract

The utility model discloses an automobile electronic expansion valve control device, a current sampling circuit can collect current data of a winding of a stepping motor in real time, the data reflect the actual working state and load condition of the motor, a main control module can more accurately adjust the driving signal of the stepping motor according to the accurate data, and the stability of the stepping motor is improved. The Hall circuit can monitor whether the motor has step loss in real time, the master control module can immediately take measures once step loss is detected, the reliability and safety of the system are remarkably improved through the real-time monitoring and feedback mechanism, and the opening degree of the expansion valve can be accurately controlled by accurately controlling the rotating speed and the rotating angle of the stepping motor. The main control module can optimize energy efficiency management of the refrigeration system, can reduce the motion frequency and amplitude of the stepping motor when the refrigeration requirement is low so as to reduce energy consumption, and can improve the motion efficiency of the stepping motor when the refrigeration requirement is high so as to meet the refrigeration requirement and achieve maximum utilization of energy.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of automobile control technical field, especially a kind of automobile electronic expansion valve control device. BACKGROUND

[0002] As a key component in automobile refrigeration system, the main function of expansion valve is to control the throttling and pressure reduction of refrigerant, so as to ensure the stable operation and efficient work of refrigeration system. In the technology of automobile expansion valve, flow regulation is the primary problem to be considered in the design process, because the main function of expansion valve is to control the flow of refrigerant. Once the flow control problem occurs, the refrigeration capacity of the refrigeration system may be affected, and even the system may be completely disabled.

[0003] The traditional automobile electronic expansion valve controller often uses a four-phase eight-beat control method when controlling the stepper motor. Although this method can meet the control requirements to some extent, the precision and reliability still need to be improved. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides an automobile electronic expansion valve control device, which can solve the defects of insufficient precision and reliability in the prior art.

[0005] The technical solution of the utility model is as follows:

[0006] An automobile electronic expansion valve control device comprises:

[0007] A power supply circuit is used to provide working voltage for the main control module, current sampling circuit and Hall circuit.

[0008] A current sampling circuit is used to collect the current of the winding of the stepper motor.

[0009] A Hall circuit is used to detect whether the stepper motor has a step loss.

[0010] A main control module is used to receive the current data of the winding of the motor and the step loss data of the stepper motor, and control the stepper motor.

[0011] As a further optional solution of the automobile electronic expansion valve control device, the device further comprises:

[0012] A LIN communication circuit is used to communicate with the host computer, receive control instructions and feedback the state of the main control module.

[0013] As a further optional solution of the automobile electronic expansion valve control device, the stepper motor has two windings, and the two windings are not connected to each other. Two bridge arms are used to control one winding of the motor and collect the current of one winding.

[0014] As a further optional solution of the automobile electronic expansion valve control device, the Hall circuit uses a switching type Hall sensor to monitor the number of rotor driving steps.

[0015] As a further optional solution of the automobile electronic expansion valve control device, the main control module comprises an LKS32AT039PXL5G6Q9 chip and its peripheral circuit.

[0016] The current sampling circuit can collect current data of the winding of the stepper motor in real time, and these data reflect the actual working state and load condition of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows.

[0018] Figure 1 FIG. 1 is a schematic diagram of the composition of the automobile electronic expansion valve control device of the present application;

[0019] Figure 2 FIG. 4 is a circuit schematic diagram of the power supply circuit in the present application;

[0020] Figure 3 FIG. 6 is a circuit schematic diagram of the current sampling circuit in the present application;

[0021] Figure 4 FIG. 8 is a circuit schematic diagram of the Hall circuit in the present application;

[0022] Figure 5 FIG. 10 is a circuit schematic diagram of the main control module in the present application;

[0023] Figure 6 The utility model discloses a circuit schematic diagram of LIN communication circuit. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0025] Reference Figures 1 to 6 The utility model discloses an automobile electronic expansion valve control device, including:

[0026] Power supply circuit is used for providing operating voltage for main control module, current sampling circuit and hall circuit;

[0027] Current sampling circuit is used for gathering the current of the winding of step motor;

[0028] Hall circuit is used for detecting whether the step motor exists the situation of losing step;

[0029] Main control module is used for receiving the current data of motor winding, the data of losing step of step motor, and controlling step motor.

[0030] In the embodiment, the current sampling circuit can collect the current data of the winding of step motor in real time, and these data reflect the actual working state and load condition of the motor. According to these accurate data, the main control module can more accurately adjust the drive signal of step motor, so as to realize the fine control of the opening degree of expansion valve. This high-precision control helps to improve the refrigeration efficiency and stability of refrigeration system. As the position sensor of step motor, the hall circuit can monitor whether the motor exists the situation of losing step in real time. Once detecting the situation of losing step, the main control module can immediately take measures. This real-time monitoring and feedback mechanism significantly improves the reliability and safety of system. By accurately controlling the rotating speed and angle of step motor, the main control module can optimize the energy efficiency management of refrigeration system. When the refrigeration demand is low, the motion frequency and amplitude of step motor can be reduced, so as to reduce energy consumption. When the refrigeration demand is high, the motion efficiency of step motor can be improved to meet the refrigeration demand. This dynamic adjustment strategy helps to realize the maximum utilization of energy.

[0031] It should be noted that by controlling the step motor, the automobile electronic expansion valve is further controlled according to the step motor, so as to realize the control of the automobile electronic expansion valve.

[0032] Preferably, the device further comprises:

[0033] LIN communication circuit, for communicating with the host computer, receiving control instructions and feeding back the state of the master control module.

[0034] In this embodiment, the LIN communication circuit enables the device to communicate efficiently and reliably with the host computer, such as the central control system of the vehicle or a dedicated control system. Through the LIN bus, the host computer can send control instructions to the master control module, realizing remote control and adjustment of the stepper motor. At the same time, the master control module can also feed back the working state, current data, and whether the stepper motor is out of step to the host computer through the LIN communication circuit, facilitating real-time monitoring and fault diagnosis by the host computer. Through the LIN communication circuit, technicians can conveniently perform remote maintenance and upgrade of the device. For example, when it is necessary to update the control algorithm or repair software vulnerabilities, new programs or patches can be downloaded to the master control module through the host computer, without the need to disassemble the device or perform complex on-site operations, which not only improves maintenance efficiency but also reduces maintenance costs.

[0035] It should be noted that the LKS32AT039PXL5G6Q9 chip has integrated the LIN PHY circuit, and only a peripheral protection circuit needs to be added.

[0036] Preferably, the stepper motor has two windings, and the two windings are not connected to each other. Two bridge arms are used to control one motor winding, and the current of one winding is collected.

[0037] In this embodiment, the design of two windings not connected to each other simplifies the internal structure of the motor, reduces the manufacturing difficulty and cost, and also reduces the risk of faults caused by improper winding connection. Using two bridge arms to control one motor winding reduces the complexity of the control system compared to multiple bridge arm control, which helps to reduce the hardware resource consumption of the controller, improve the reliability and stability of the system. By collecting the current of one winding, the running state and load condition of the stepper motor can be monitored in real time. This precise current collection helps to achieve fine control of the stepper motor, improving the response speed and accuracy of the system. According to the collected current data, the master control module can dynamically adjust the driving signal of the stepper motor to optimize energy consumption management, providing sufficient power when needed and reducing energy consumption when not needed, thereby maximizing the use of energy. The design of two windings not connected to each other helps to reduce electromagnetic interference and improve the running stability and precision of the stepper motor, which helps to ensure the precise control of the expansion valve. Due to the simplified motor structure and reduced control complexity, maintenance of the device becomes simpler and more convenient, technicians can more easily diagnose and solve potential problems, reducing maintenance costs and time. By accurately collecting current data and monitoring the running state of the stepper motor in real time, the fault point can be quickly located and appropriate measures can be taken for repair.

[0038] Preferably, the Hall circuit uses a switching Hall sensor to monitor the rotor driving steps.

[0039] In this embodiment, the switching Hall sensor has high precision and high sensitivity, and can accurately detect the change of the magnetic field, thereby accurately monitoring the rotor driving steps of the stepper motor, which helps to ensure that the stepper motor rotates according to the predetermined steps and direction, and improves the accuracy of control; the switching Hall sensor adopts a non-contact detection method, avoiding the failure caused by friction and wear of traditional mechanical sensors; in addition, the switching Hall sensor has strong anti-interference ability and can work stably in a complex electromagnetic environment, further enhancing the reliability of the system; by accurately monitoring the rotor driving steps, fine control of the stepper motor can be realized, which helps to optimize the performance of the stepper motor, such as improving the response speed, reducing energy consumption and reducing vibration, etc., and accurate control of the steps of the stepper motor can also ensure more accurate opening degree adjustment of the expansion valve, and improve the performance and stability of the refrigeration system; using the switching Hall sensor to replace the traditional mechanical or photoelectric sensor can simplify the structure of the system, which helps to reduce the complexity and cost of the system; the switching Hall sensor has a clear output state, and when the stepper motor loses steps or fails, the output state of the Hall circuit will change, which helps technicians quickly locate the fault point and take appropriate maintenance measures, and since the switching Hall sensor has high reliability and stability, the system downtime caused by sensor failure can be reduced.

[0040] Preferably, the main control module comprises an LKS32AT039PXL5G6Q9 chip and its peripheral circuit.

[0041] In this embodiment, the LKS32AT039PXL5G6Q9 chip integrates a double H-bridge circuit composed of 4 pairs of P-N power MOS, and also integrates LIN PHY and 5V LDO, which has high integration, can drive DC brushless and stepper motors through different forms of external current sampling resistors, and has high flexibility.

[0042] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A control device for an automotive electronic expansion valve, characterized in that, include: The power supply circuit is used to provide operating voltage for the main control module, current sampling circuit and Hall circuit; Current sampling circuit is used to collect the current of the stepper motor windings; Hall effect circuits are used to detect whether a stepper motor is missing steps. The main control module is used to receive current data from the motor windings and stepper motor data, and to control the stepper motor.

2. The automotive electronic expansion valve control device according to claim 1, characterized in that, The device further includes: The LIN communication circuit is used to communicate with the host computer, receive control commands, and provide feedback on the status of the main control module.

3. The automotive electronic expansion valve control device according to claim 2, characterized in that, The stepper motor has two windings that are not connected to each other. Two bridge arms are used to control one motor winding and to collect the current of one winding.

4. The automotive electronic expansion valve control device according to claim 3, characterized in that, The Hall circuit uses a switch-type Hall sensor to monitor the rotor drive steps.

5. The automotive electronic expansion valve control device according to claim 4, characterized in that, The main control module includes the LKS32AT039PXL5G6Q9 chip and its peripheral circuits.

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