An electronic valve calibration method

Abstract

The present application relates to a kind of electronic valve calibration methods, comprising the following steps: detecting whether the valve is in abnormal condition, if it is in abnormal condition, the valve is restarted, and after restarting, the valve is calibrated, otherwise, the valve is directly calibrated;The calibration operation includes the following steps: drive the valve to run to the first mechanical limit in the first adjustment direction at the first speed;Drive the valve to leave the first mechanical limit in the second adjustment direction at the second speed, adjust to the third speed after running to the preset first reference angle, keep the third speed and run to the second mechanical limit;Drive the valve to leave the second mechanical limit in the first adjustment direction at the second speed, keep the second speed and run to the valve initialization position.The present application can reduce the strength of electronic valve calibration, improve the mechanical limit of water valve stall problem, increase the service life of electronic water valve.

Description

Technical Field

[0001] This invention relates to the field of electronic valve calibration technology, and in particular to an electronic valve calibration method. Background Technology

[0002] Electronic valves have wide applications in various fields, especially as new energy vehicles gradually become the mainstream mode of transportation. Electronic water valves play a significant role in the heat utilization of these vehicles. However, with prolonged operation, the lifespan of electronic valves gradually becomes an issue, and extending their service life presents a significant challenge.

[0003] Electronic valves using Hall effect sensors often require calibration after position loss or long-term accumulated errors. The cumulative calibration can cause wear on the motor structure and internal gear structure of the electronic valve, thereby affecting the service life of the valve. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an electronic valve calibration method that can reduce the intensity of electronic valve calibration, improve the mechanical limit and jamming problem of water valve, and increase the service life of electronic water valve.

[0005] The technical solution adopted by this invention to solve its technical problem is: to provide an electronic valve calibration method, comprising the following steps:

[0006] The system detects whether the valve is in an abnormal operating condition. If it is, the valve is restarted, and then calibrated. Otherwise, the valve is calibrated directly. The calibration process includes the following steps:

[0007] The valve is driven to move along a first adjustment direction at a first speed to a first mechanical limit, wherein the first mechanical limit is the mechanical limit of the valve along the first adjustment direction;

[0008] The valve is driven to move away from the first mechanical limit at a second speed along the second adjustment direction, and after running to a preset first reference angle, it is adjusted to a third speed and maintained at the third speed until it reaches the second mechanical limit. The second adjustment direction is opposite to the first adjustment direction, and the second mechanical limit is the mechanical limit of the valve along the second adjustment direction.

[0009] Drive the valve along the first adjustment direction at the second speed away from the second mechanical limit, and maintain the second speed to run to the valve initialization position.

[0010] Furthermore, both the first speed and the third speed are less than the second speed.

[0011] Furthermore, within a preset limit detection time, when the motor current driving the valve is greater than a preset current threshold and the Hall signal does not change, it is considered that the valve has moved to the first mechanical limit or the second mechanical limit.

[0012] Furthermore, after the valve operates to the first mechanical limit or the second mechanical limit, before leaving at the second speed, it also includes a step of remaining stopped for a preset limit buffer time.

[0013] Furthermore, the first adjustment direction is clockwise, the first mechanical limit is the left limit, the second adjustment direction is counterclockwise, and the second mechanical limit is the right limit.

[0014] Furthermore, when the valve is running at the second speed, the duty cycle of the PWM drive signal that drives the valve is 100%.

[0015] Furthermore, when the power supply voltage of the valve changes, the duty cycle of the PWM drive signal that drives the valve is adjusted to keep the valve's operating speed constant.

[0016] Furthermore, the abnormal operating condition is a valve stalling failure at the second mechanical limit position.

[0017] Furthermore, the restart operation includes:

[0018] Drive the valve to move away from the second mechanical limit along the first adjustment direction at a second speed;

[0019] The valve is driven to run along the first adjustment direction at a second speed to a preset second reference angle.

[0020] Furthermore, between the step of driving the valve to move away from the second mechanical limit at a second speed along the first adjustment direction and the step of driving the valve to move to a preset second reference angle along the first adjustment direction at a second speed, the method further includes:

[0021] The system detects whether the valve has a stall fault. If a stall fault occurs, the restart operation is performed again after a preset restart time. Otherwise, the current restart operation is continued.

[0022] Repeat the previous step until the number of restarts exceeds the preset value and then no longer restarts, or until the current restart operation is completed.

[0023] Beneficial effects

[0024] By adopting the above-mentioned technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0025] (1) Before calibration, the present invention eliminates the mechanical limit jamming fault by detecting the jamming of the mechanical limit and taking effective restart measures;

[0026] (2) By controlling the valve operating speed, the present invention enables the valve to enter the mechanical limit at a stable low speed and leave the mechanical limit at full speed, thereby stably reducing the valve calibration strength, effectively preventing wear of the motor structure and internal gear structure of the electronic valve, and thus extending the service life of the valve.

[0027] (3) This invention quickly and accurately determines whether the valve has reached the mechanical limit by collecting drive current and Hall signal;

[0028] (4) During the calibration process, a specific algorithm is used to continuously adapt to changes in the external power supply voltage and PWM duty cycle adjustment is adopted to ensure that the speed at which the valve enters the mechanical limit remains consistent, thereby stably reducing the valve calibration intensity. Attached Figure Description

[0029] Figure 1 This is a flowchart of the first embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the restart phase under abnormal operating conditions in the first embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the calibration stage under abnormal operating conditions in the first embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the calibration stage under normal operating conditions in the first embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the speed control system in the first embodiment of the present invention. Detailed Implementation

[0034] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0035] The first embodiment of the present invention relates to an electronic valve calibration method, such as... Figure 1 As shown, it includes the following steps:

[0036] A1. Detect whether the valve is in an abnormal operating condition, wherein the abnormal operating condition is that the valve is stuck at the second mechanical limit, and the second mechanical limit is the mechanical limit of the valve along the second adjustment direction;

[0037] A2. If the valve is in an abnormal operating condition, restart the valve and then calibrate it after restarting; otherwise, directly calibrate the valve.

[0038] The restart process includes the following steps:

[0039] B1. Drive the valve to move away from the second mechanical limit at full speed along the first adjustment direction, wherein the first adjustment direction is opposite to the second adjustment direction;

[0040] B2. Check if the valve is stuck. If a stuck valve is found, restart the valve after the preset restart time. Otherwise, continue with the current restart operation.

[0041] B3. Repeat step B2 until the number of restarts exceeds the preset value and then no longer restarts, or until the current restart operation is completed.

[0042] B4. Drive the valve to run at full speed along the first adjustment direction to the preset second reference angle.

[0043] The calibration process includes the following steps:

[0044] C1. Drive the valve to run at low speed along the first adjustment direction to the first mechanical limit and hold it for a buffer period of time. The first mechanical limit is the mechanical limit of the valve along the first adjustment direction.

[0045] C2. Drive the valve to move away from the first mechanical limit at full speed along the second adjustment direction, and after running to the preset first reference angle, adjust to low speed, maintain low speed to the second mechanical limit and maintain buffer for a period of time;

[0046] C3. Drive the valve to move away from the second mechanical limit at full speed in the first adjustment direction, and maintain full speed operation until the valve is in the initial position.

[0047] During calibration, the valve's mechanical limit is determined by detecting motor current and Hall effect signals. If, within a preset limit detection time, the motor current driving the valve exceeds a preset current threshold and the Hall effect signal remains unchanged, the valve is considered to have reached the mechanical limit. The valve operates at full speed by adjusting the duty cycle of the PWM drive signal to 100%. When the valve's supply voltage changes, the duty cycle of the PWM drive signal is adjusted to ensure the valve's rate of entering the mechanical limit remains consistent, thereby stably reducing the calibration intensity of the water valve.

[0048] The following section will further illustrate this method by describing its specific application in automotive electronic water valves.

[0049] The calibration system for electronic water valves includes an actuator module and a drive module, detailed below:

[0050] (1) Actuator module: controls and adjusts the running direction, running position, and running status of the water valve;

[0051] (2) Drive module: Adjust the water valve running speed in real time based on the feedback signal of the Hall sensor and the AD sampling value of the power supply voltage.

[0052] When a water valve loses its position, it needs to be calibrated to determine its initial position so that it can subsequently work normally according to the controller's instructions. Therefore, the success or failure of calibration determines the fate of the water valve.

[0053] If the water valve experiences an abnormal power outage during operation, its position will become uncertain, resulting in an abnormal operating condition where the calibrated starting position is at the mechanical limit. The mechanical limit position of the water valve experiences extremely high load, while under normal operating conditions, the calibrated first-stage operating speed V... in The force generated is relatively small, which makes it easy for mechanical limit jamming to occur.

[0054] Under abnormal operating conditions, water valve calibration is divided into two stages. Taking mechanical right limit jamming as an example, if the water valve detects a mechanical right limit lock-up fault, it will enter the first stage, namely the restart stage. Figure 2 As shown. In the first stage, the control module drives the water valve clockwise and maintains a full speed V. out Moving towards the left limit of the machine, at an operating angle θ ref Then, the second stage begins, such as... Figure 3 As shown, the system operates according to the calibration strategy described in the normal operating condition description, except that the restart endpoint position is now the calibration start position. If the water valve is at angle θ... ref If a stall fault occurs within the specified time T, then... res The system will then restart. If a stall fault occurs again, this restart mechanism will be maintained. If the fault cannot be eliminated after 10 restarts, restarting will cease. If no mechanical right limit stall fault is detected in the water valve, the system will operate according to the strategy described in the normal operating condition description.

[0055] Under normal operating conditions, water valve calibration is divided into three stages, such as... Figure 4 As shown. In the first stage of calibration, the control module drives the water valve clockwise and maintains a low speed V. in When the mechanical device moves to the left limit, and the motor current exceeds a certain threshold I, it will move to the left limit. ref And the Hall signal remains unchanged (detection duration is T). l The control module then determines that the water valve has reached the mechanical left limit, at which point the water valve stops for a set time T. w As a buffer, once the buffering is complete, the first stage of calibration ends. In the second stage of calibration, the control module drives the water valve counterclockwise and maintains a full speed V. out After leaving the mechanical left limit, at the operating angle θ refThen, the control module adjusts the water valve's operating speed to ensure that the water valve rotates counterclockwise and maintains a low speed (V). in When the machine moves to the right limit switch, and the motor current exceeds a certain threshold I, it will move to the right limit switch. ref And the Hall signal remains unchanged (detection duration is T). l The control module then determines that the water valve has reached the mechanical right limit, at which point the water valve stops again for the set time T. w As a buffer, once the buffering is complete, the second stage of calibration ends; in the third stage of calibration, the control module drives the water valve clockwise and maintains full speed V. out The machine moves from the right limit switch of the mechanical valve to the initial position of the water valve. Once the initial position is reached, the calibration is successful.

[0056] During the calibration process, to reduce the impact strength of the water valve on the mechanical limit switch and ensure that the water valve can successfully complete the calibration, a low-speed V-shaped method is used. in Entering limit and full speed V out Strategies for leaving the limit. For example... Figure 5 A schematic diagram of the speed control system is given, showing the operating speed V. in and V out The control uses PWM duty cycle adjustment, where the running speed V in The operating speed of the water valve needs to remain constant, but the power supply voltage to the water valve cannot be kept constant under actual operating conditions. This phenomenon affects the operating speed of the water valve. Therefore, a specific algorithm is used to adjust the operating speed V in real time. in It remains constant under different voltages; while the operating speed V out It is necessary to maintain full speed at all times, that is, under the actual external power supply voltage, maintain the PWM duty cycle at 100% to adjust the water valve operating speed, so as to ensure that the water valve can leave the limit position with the maximum force.

[0057] As can be seen from the above, this invention abandons traditional methods and adopts a novel strategy that combines current and pulse for limit detection, ensuring accurate and reliable calibration. Simultaneously, it adds a mechanism for handling abnormal operating conditions, effectively solving the problem of mechanical limit jamming of the valve during calibration. In the drive module, a PWM-modulated wave drives a brushed DC motor, which can intelligently adjust the valve's operating speed according to changes in the external power supply voltage, thus reasonably controlling the calibration intensity of the valve.

Claims

1. A method for calibrating an electronic valve, characterized in that, Includes the following steps: The system detects whether the valve is in an abnormal operating condition. If it is, the valve is restarted, and then calibrated. Otherwise, the valve is calibrated directly. The calibration process includes the following steps: The valve is driven to move along a first adjustment direction at a first speed to a first mechanical limit, wherein the first mechanical limit is the mechanical limit of the valve along the first adjustment direction; The valve is driven to move away from the first mechanical limit at a second speed along the second adjustment direction, and after running to a preset first reference angle, it is adjusted to a third speed and maintained at the third speed until it reaches the second mechanical limit. The second adjustment direction is opposite to the first adjustment direction, and the second mechanical limit is the mechanical limit of the valve along the second adjustment direction. Drive the valve along the first adjustment direction at the second speed away from the second mechanical limit, and maintain the second speed to run to the valve initialization position.

2. The calibration method according to claim 1, characterized in that, Both the first speed and the third speed are less than the second speed.

3. The calibration method according to claim 1, characterized in that, Within a preset limit detection time, when the motor current driving the valve is greater than a preset current threshold and the Hall signal does not change, the valve is considered to have moved to the first mechanical limit or the second mechanical limit.

4. The calibration method according to claim 1, characterized in that, After the valve operates to the first mechanical limit or the second mechanical limit, before leaving at the second speed, it also includes a step of keeping it stopped within a preset limit buffer time.

5. The calibration method according to claim 1, characterized in that, The first adjustment direction is clockwise, the first mechanical limit is the left limit, the second adjustment direction is counterclockwise, and the second mechanical limit is the right limit.

6. The calibration method according to claim 1, characterized in that, When the valve is running at the second speed, the duty cycle of the PWM drive signal that drives the valve is 100%.

7. The calibration method according to claim 1, characterized in that, When the power supply voltage of the valve changes, the duty cycle of the PWM drive signal that drives the valve is adjusted to keep the valve's operating speed constant.

8. The calibration method according to claim 1, characterized in that, The abnormal operating condition is that the valve experiences a stall failure at the second mechanical limit position.

9. The calibration method according to claim 8, characterized in that, The restart operation includes: Drive the valve to move away from the second mechanical limit along the first adjustment direction at a second speed; The valve is driven to run along the first adjustment direction at a second speed to a preset second reference angle.

10. The calibration method according to claim 9, characterized in that, Between the step of driving the valve away from the second mechanical limit at a second speed along the first adjustment direction and the step of driving the valve to run at a second speed along the first adjustment direction to a preset second reference angle, the method further includes: The system detects whether the valve has a stall fault. If a stall fault occurs, the restart operation is performed again after a preset restart time. Otherwise, the current restart operation is continued. Repeat the previous step until the number of restarts exceeds the preset value and then no longer restarts, or until the current restart operation is completed.

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