Electronic actuator electric control device

Abstract

The utility model discloses an electric control device of an electronic actuator, belongs to the technical field of electronic water valves of new energy automobiles, and particularly relates to an electric control device of an electronic water valve actuator, which replaces a direct-current brush motor of the existing electric control device of the electronic actuator with a single-phase brushless motor additionally provided with a Hall switch chip. The single-phase brushless motor is controlled on the premise that the cost is not obviously increased, and meanwhile the requirements for long service life and low electromagnetic noise of the electronic water valve are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic water valves for new energy vehicles, and particularly relates to an electronic control device for an electronic water valve actuator, and specifically relates to an electronic actuator electronic control device. Background Art

[0002] In the thermal management system of new energy vehicles, the electronic water valve is an indispensable component. The actuator of the electronic water valve includes the control circuit PCBA, motor, gear transmission mechanism and gearbox. The motor can be a DC brush motor, a stepper motor and a brushless motor. For work environments with long life and low noise requirements, if a DC brush motor is used, the motor life is generally at the level of several hundred hours due to the wear of the carbon brush. At the same time, the electric spark generated by the DC brush motor at the commutation moment will generate significant electromagnetic noise in the frequency band of 200MHz to 2.5GHz. The noise in certain frequency bands is difficult to be suppressed outside the motor.

[0003] If the motor is replaced with a stepper motor or a three-phase brushless motor, the performance indicators of life and noise can be met. However, in order to adapt to these two motors, the original actuator's control circuit, gear and gearbox design will need to be greatly changed, and the material cost will increase significantly.

[0004] Patent document with publication number CN210859976U discloses a four-way electronic water valve and its thermal management system, including a valve body, a flange, a valve core, an actuator, and a pipe mouth sealing part. The pipe mouth sealing part is composed of a spray layer and a sealing member. The spray layer is sprayed on one side of the sealing member. The spray layer material is polytetrafluoroethylene, and the spray layer is in contact with the spherical end of the valve core. One side of the seal is interference fit with the pipe mouth. A limit platform is designed at one end of the valve core, and a limit structure matching the limit platform is designed on the flange. The utility model uses a four-way valve to control the circulation and conversion of dual pipelines. During circulation and conversion, the impact pressure of the cooling medium on the pipeline is stable, and the temperature control effect is good; the control program is simple to use and the failure rate of the electronic control is reduced; the thermal management system pipeline layout is highly integrated; the product has good sealing performance; and the manufacturing, use and maintenance costs are reduced. Utility Model Content

[0005] In view of this, the utility model aims at the deficiencies of the prior art and provides an electronic actuator electronic control device, which replaces the DC brush motor of the original actuator with a single-phase brushless motor without changing the design of the gears and gearbox, thereby realizing control of the single-phase brushless motor without significantly increasing the cost. At the same time, due to the use of the brushless motor, the requirements of long life and low electromagnetic noise of the electronic water valve are met.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] An electronic actuator electronic control device is improved on the basis of an existing electronic actuator electronic control device, including a gear transmission mechanism and a control circuit PCBA, and the DC brush motor of the existing electronic actuator electronic control device is replaced with a single-phase brushless motor with a Hall switch chip installed;

[0008] The control circuit PCBA includes a power supply part, a microcontroller, an H-bridge driver chip and an angle sensor. The power supply is respectively connected to the angle sensor and the microcontroller to provide electricity; the H-bridge driver chip and the microcontroller are respectively connected to the single-phase brushless motor through PCB copper foil and wires, the output end of the single-phase brushless motor is connected to the gear transmission mechanism to output power to the gear transmission mechanism, the gear transmission mechanism is connected to the angle sensor, and the angle sensor obtains the absolute position information of the output gear of the gear transmission mechanism and transmits it to the microcontroller.

[0009] Specifically, the Hall switch chip installed inside the single-phase brushless motor is connected to the power supply part and the microcontroller of the control circuit PCBA through three wiring harnesses: a 5V power supply, a Hall switch sensor output signal, and a sensor ground wire.

[0010] Specifically, a radially magnetized magnet is installed on the output gear in the gear transmission mechanism, and the magnet is coaxially fixed at the center of the output gear.

[0011] Specifically, the single-phase brushless motor with the Hall switch chip installed has the same dimensions as the replaced DC brushed motor.

[0012] For work environments that require long life and low noise, if a brushed DC motor is used, the motor life is generally only a few hundred hours due to the wear of the carbon brushes. At the same time, the electric sparks generated by the brushed DC motor during commutation will generate significant electromagnetic noise in the 200MHz to 2.5GHz frequency band. Noise in certain frequency bands is difficult to suppress outside the motor.

[0013] If the motor is replaced with a stepper motor or a three-phase brushless motor, the performance indicators of life and noise can be met. However, in order to adapt to these two motors, the original actuator's control circuit, gear and gearbox design will need to be greatly changed, and the material cost will increase significantly.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] The utility model replaces the DC brush motor of the original actuator with a single-phase brushless motor with the same external dimensions without changing the design of the gears and the gearbox, thereby achieving control of the single-phase brushless motor without significantly increasing the cost. At the same time, due to the use of the brushless motor, the requirements of long life and low electromagnetic noise of the electronic water valve are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the principle of the actuator of Example 1 of the utility model;

[0017] Figure 2 It is a schematic diagram of the principle of the original actuator of Example 1 of the utility model. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0019] Example 1

[0020] like Figure 1 As shown, it is a schematic diagram of the actuator principle of an electronic actuator electronic control device provided by the utility model, which is improved on the basis of the existing electronic actuator electronic control device, including a gear transmission mechanism and a control circuit PCBA. The motor used inside the actuator is a brush motor, but the brush motor has its inherent disadvantages: short life and poor EMC performance. The utility model mainly replaces the DC brush motor of the existing electronic actuator electronic control device with a single-phase brushless motor equipped with a Hall switch chip.

[0021] The control circuit PCBA includes a power supply part, a microcontroller, an H-bridge driver chip and an angle sensor. The power supply is respectively connected to the angle sensor and the microcontroller to provide electricity; the H-bridge driver chip and the microcontroller are respectively connected to the single-phase brushless motor through PCB copper foil and wires, the output end of the single-phase brushless motor is connected to the gear transmission mechanism to output power to the gear transmission mechanism, the gear transmission mechanism is connected to the angle sensor, the angle sensor obtains the absolute position information of the output gear of the gear transmission mechanism and transmits it to the microcontroller, and a radially magnetized magnet is installed on the output gear in the gear transmission mechanism, and the magnet is coaxially fixed at the center of the output gear.

[0022] Furthermore, the single-phase brushless motor with the Hall switch chip installed has the same dimensions as the replaced DC brushed motor, and the Hall switch chip installed inside the single-phase brushless motor is connected to the power supply part and the microcontroller of the control circuit PCBA through three wiring harnesses: 5V power supply, Hall switch sensor output signal, and sensor ground wire. When the N pole of the rotor permanent magnet of the single-phase brushless motor passes through the position of the Hall switch chip, the output of the Hall switch chip will flip and the output voltage will jump.

[0023] Because when the original brushed motor is working, sparks are generated between the carbon brush and the commutator, which will produce large EMI noise, and some frequency bands are difficult to suppress. After replacing the single-phase brushless motor, since carbon brushes and commutators are not required, sparks no longer exist, which fundamentally extends the service life of the brushless motor and reduces maintenance and replacement costs.

[0024] This solution uses a position sensor to detect the rotor position signal of a single-phase brushless DC motor, that is, a Hall switch device is used to detect the position of the rotor of a single-phase brushless DC motor. A single-phase brushless DC motor only needs one rotor position sensor, which detects the polarity of the rotor magnet and outputs a signal to control the drive circuit. The position sensor divides a commutation cycle (360° electrical angle) into two equal states. The single-phase winding of the motor adopts a full-wave working mode of H-bridge power supply, which requires four power switches. In a commutation cycle, the working mode for a single winding is forward conduction in the first half of the time and reverse conduction in the second half of the time. The interaction between the current of the stator coil and the permanent magnet rotor generates electromagnetic torque, which causes the motor to rotate.

[0025] In the utility model, the output polarity of the H-bridge chip is controlled by the microcontroller, and the polarity of the output signal of the Hall switch for detecting the motor rotor position is also fed back to the microcontroller. The microcontroller controls the output polarity of the H-bridge chip according to the polarity of the Hall switch output signal, and can flexibly control the forward rotation or reverse rotation of the single-phase brushless motor.

[0026] The utility model replaces the DC brushed motor of the original actuator with a single-phase brushless motor with the same appearance and size without changing the design of the gears and the gear box, thereby realizing the control of the single-phase brushless motor without significantly increasing the cost. At the same time, due to the use of the brushless motor, the requirements of long life and low electromagnetic noise of the electronic water valve are met.

[0027] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An electronic actuator electronic control device, which is improved on the basis of the existing electronic actuator electronic control device, includes a gear transmission mechanism and a control circuit PCBA, and is characterized in that: Replace the DC brushed motor of the existing electronic actuator electronic control device with a single-phase brushless motor equipped with a Hall switch chip; The control circuit PCBA includes a power supply part, a microcontroller, an H-bridge driver chip and an angle sensor. The power supply is respectively connected to the angle sensor and the microcontroller to provide electricity; the H-bridge driver chip and the microcontroller are respectively connected to the single-phase brushless motor through PCB copper foil and wires, the output end of the single-phase brushless motor is connected to the gear transmission mechanism to output power to the gear transmission mechanism, the gear transmission mechanism is connected to the angle sensor, and the angle sensor obtains the absolute position information of the output gear of the gear transmission mechanism and transmits it to the microcontroller.

2. The electronic actuator electronic control device according to claim 1, characterized in that: The Hall switch chip installed inside the single-phase brushless motor is respectively connected to the power supply part and the microcontroller of the control circuit PCBA through three wiring harnesses including a 5V power supply, a Hall switch sensor output signal, and a sensor ground wire.

3. The electronic actuator electronic control device according to claim 2, characterized in that: A radially magnetized magnet is installed on the output gear in the gear transmission mechanism, and the magnet is coaxially fixed at the center of the output gear.

4. The electronic actuator electronic control device according to claim 2, characterized in that: The single-phase brushless motor with the Hall switch chip installed has the same dimensions as the replaced DC brushed motor.

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