Pulse jet control method and system

Abstract

The application discloses a pulse jet control method and system, relates to the technical field of pneumatic control, and aims to solve the problems of the pulse control method based on airflow feedback, such as that under the condition of long pipelines, high-pressure gas in the pipeline reversely expands to easily trigger an airflow sensor to generate an error signal when the pulse is turned off, the control logic is difficult to accurately distinguish between pulse intermittence and user shutdown, and gas consumption is large and the like. The method comprises the following steps: keeping the electromagnetic valve always open in the standby state; entering the pulse cycle when the airflow switch signal changes from no to yes is detected; when the airflow switch signal changes to no is detected, the electromagnetic valve is forced to be always open, the pulse control is stopped, and the duration of the no signal is accumulated; and if the signal is restored during the accumulation, the duration is cleared and the pulse cycle is returned. Through the control logic of stopping the pulse and then accumulating the time, and in cooperation with the reverse blocking of the one-way valve, the logic deadlock problem under the long pipeline can be relieved, the user's intuitive operation experience is retained, the consumption of compressed air is reduced, and the improvement cost is low.

Description

Technical Field

[0001] This invention belongs to the field of pneumatic control technology, specifically, it relates to a pulse jet control method and system. Background Technology

[0002] Currently, high-pressure jet systems widely used in the civilian market typically employ a combination of a high-pressure air pump, an air tank, and a handheld jet gun. The handheld jet gun is equipped with a mechanical trigger switch, allowing users to control the airflow at any time by pulling or releasing the trigger, making operation intuitive and convenient. However, this traditional system can only output a continuous airflow, and in practical use, it suffers from the following problems: First, it consumes a lot of gas and is not energy-efficient. High-pressure air pumps usually have high power, especially in commercial places such as car washes and auto repair shops. Long-term continuous spraying will consume a lot of compressed air, resulting in serious waste of electricity and high operating costs.

[0003] Second, the cleaning effect of continuous airflow is limited. While a constant continuous airflow can remove dust or dry surface water stains, it is often not very effective at removing stubborn dirt or residual liquid in crevices. In contrast, pulsed airflow can generate stronger impact and disturbance through pressure fluctuations, resulting in higher cleaning efficiency.

[0004] To achieve pulse jet propulsion, existing technologies have mainly attempted the following control methods: One method is the purely mechanical pulse method. This method integrates the mechanical pulse generator inside the handheld spray gun, which significantly increases the weight of the spray gun, makes operation laborious, and results in a complex mechanical structure and high cost, making it difficult to promote.

[0005] The second method is the open-loop electronic pulse method. This method connects a solenoid valve in series in the air circuit, and the controller periodically controls the opening and closing of the solenoid valve according to a fixed timing sequence. However, this open-loop control method cannot detect the user's intention to operate the handheld mechanical switch. The user cannot freely control the start and stop of the pulse airflow with the spray gun in their hand, thus losing the intuitive operating experience of the traditional air gun that allows you to "turn it on when you want and turn it off when you want".

[0006] Thirdly, there is the closed-loop pulse method based on airflow feedback. This method detects whether the user has pulled the trigger using an airflow sensor, and then starts or stops the pulse cycle accordingly. However, when there is a long pipeline (e.g., more than 10 meters) between the solenoid valve and the handheld jet gun, this method faces an unresolved technical problem: during the solenoid valve pulse shut-off period, the high-pressure gas stored in the long pipeline expands in the reverse direction and flows back to the airflow sensor, triggering the sensor to generate an incorrect "flow present" signal. The system then misjudges that the user is still pulling the trigger, causing the control logic to deadlock—the pulse cannot stop according to the user's intention to release the trigger, eventually degenerating into continuous air output, completely losing the pulse function and user control capability. Analysis shows that the root cause of this problem lies in the design flaw of the existing feedback control logic: existing solutions typically use the logic of "after detecting an airflow interruption, entering a stop and waiting timer, while continuing to maintain pulse output during the timer period." Under this logic, the pulse valve opening action during the timer period will re-trigger the airflow sensor, causing the timer to be repeatedly reset to zero, and the system will never reach the stop condition, thus inevitably leading to a logic deadlock failure.

[0007] Therefore, there is an urgent need for a pulse jet control method that can correctly distinguish between "pulse intermittent" and "user shutdown" in order to completely solve the logic deadlock problem under long pipeline conditions, while retaining the user's ability to operate intuitively through a handheld mechanical switch and achieving significant energy-saving effects.

[0008] There are currently no effective solutions to the problems in the relevant technologies.

[0009] Therefore, in order to solve the above problems, the present invention provides a pulse jet control method and system. Summary of the Invention

[0010] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a pulse jet control method and system.

[0011] The objective of this invention can be achieved through the following technical solutions: A pulse jet control method is applied to an air circuit module, the air circuit module including a high-pressure air source, a high-frequency solenoid valve, an airflow switch, a one-way valve, and a handheld jet gun connected in sequence; the method includes the following steps: S1, Standby state: Controls the high-frequency solenoid valve to remain normally open; S2. Start detection: When the output signal of the airflow switch changes from zero to intermittent, the pulse cycle begins; S3, Pulse Cycle: The high-frequency solenoid valve is alternately controlled to open and close according to a preset pulse period and duty cycle to generate pulse airflow; wherein, during the period when the high-frequency solenoid valve is closed, the one-way valve is closed under the action of reverse pressure in the pipeline, so that the output signal of the airflow switch becomes zero; S4. Pause Detection: In S3, when the output signal of the airflow switch is detected to be zero, immediately perform the following operation: Forcefully open the high-frequency solenoid valve and keep it in the normally open state to stop pulse cycle control; Start accumulating the duration during which the output signal is zero; If the output signal becomes active again during the accumulation period, the accumulated value is cleared and the process returns to S3; If the cumulative duration reaches the preset shutdown threshold, then return to S1.

[0012] As a preferred embodiment of the present invention, the frequency of the pulse period is 0.2-10Hz, and the duty cycle is 10%-90%.

[0013] As a preferred embodiment of the present invention, the preset shutdown threshold is greater than the single shutdown time in the pulse cycle.

[0014] As a preferred embodiment of the present invention, the one-way valve is a diaphragm one-way valve with an opening pressure of less than 2 MPa and a response time of less than 15 ms.

[0015] As a preferred technical solution of the present invention, it further includes a parameter setting step: before or during S1, receiving configuration parameters sent by an external terminal through an Internet of Things communication module, and updating the preset pulse period, duty cycle or shutdown threshold according to the configuration parameters.

[0016] As a preferred technical solution of the present invention, the external terminal provides a variety of preset operation modes, including at least an energy-saving mode, a powerful mode and a gentle mode, each mode corresponding to a different set of pulse period and duty cycle parameters.

[0017] As a preferred technical solution of the present invention, a remote upgrade step is also included: during S1, firmware update data is received through the Internet of Things communication module, and firmware upgrade is performed.

[0018] A pulse jet control system, comprising: The air circuit module includes a high-pressure air source, a high-frequency solenoid valve, an airflow switch, a one-way valve, and a handheld air gun connected in sequence; wherein, the airflow switch is used to detect airflow and output an electrical signal; The control module is electrically connected to the airflow switch and the high-frequency solenoid valve, respectively, and the control module is configured as follows: (a) In the standby state, the high-frequency solenoid valve is controlled to remain in the normally open state; (b) When the output signal of the airflow switch changes from zero to sometimes, the on / off state of the high-frequency solenoid valve is alternately controlled according to the preset pulse period and duty cycle to generate pulse airflow; (c) During the alternating control process, when the output signal of the airflow switch is detected to be absent, the high-frequency solenoid valve is forcibly opened and kept in the normally open state, the pulse cycle control is stopped, and the duration of the absence of the output signal is accumulated. If the output signal becomes present again during the accumulation period, the alternating control is resumed. If the accumulated duration reaches the preset shutdown threshold, the standby state is returned.

[0019] As a preferred embodiment of the present invention, the airflow switch is a magnetic reed flow switch with a response time of less than 1ms.

[0020] As a preferred embodiment of the present invention, the high-frequency solenoid valve is a direct-acting solenoid valve with a response time of less than 10ms.

[0021] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention employs a control logic of "stopping the pulse first, then accumulating the time." When the system detects that the airflow switch signal has become "none," it first forces the high-frequency solenoid valve to remain open, stopping the pulse cycle control action, and then begins accumulating the duration of no signal. This design avoids the repeated resetting of the timer caused by the pulse valve opening action repeatedly triggering the airflow sensor under the "timekeeping and pulse" logic in existing technologies. Furthermore, even with a long pipeline connection, the system can still switch between pulse output and shutdown as expected. After the user releases the trigger, the system can accurately exit the pulse cycle under preset conditions, reducing the likelihood of pulses failing to stop or degenerating into continuous airflow due to logic deadlock.

[0022] 2. This invention determines the user's intention to operate the trigger based on the feedback signal of the airflow switch. When the user pulls the trigger, a pulsed airflow is obtained; when the trigger is released, the airflow stops. The operation method is basically the same as that of a traditional continuous jet gun, requiring no change in usage habits or additional learning, which helps to lower the user's learning curve.

[0023] 3. This invention uses duty cycle control to replace continuous gas supply with intermittent gas supply. Under normal parameter settings, the off-time in the pulse cycle occupies a certain proportion, which can reduce the ineffective emission of compressed air, thereby reducing the replenishment frequency and running time of the downstream high-pressure air pump, which helps to reduce energy consumption. For commercial sites that use gas for extended periods, this effect helps to control operating costs.

[0024] 4. The control logic of this invention can be implemented on a general-purpose MCU controller, and the cost of the required hardware (high-frequency solenoid valve, airflow switch, one-way valve, MCU controller) is controllable. This solution can be directly connected in series to the air circuit of the existing "air pump + air tank" system without replacing the original handheld air gun. The modification process is relatively simple and facilitates low-cost pulsed upgrades on existing equipment.

[0025] 5. This invention supports remote adjustment of parameters such as pulse frequency, duty cycle, and shutdown threshold via wireless communication, and allows selection of preset modes (such as energy-saving mode, powerful mode, and gentle mode) according to different application needs. Users can adapt to various scenarios such as car detailing, industrial cleaning, garden maintenance, and home cleaning without disassembling the device or reprogramming it, thus improving the device's adaptability to different scenarios.

[0026] 6. This invention reduces compressed air consumption, thereby lowering the workload and start-stop frequency of the high-pressure air pump, which helps extend the pump's service life. Simultaneously, the forced normally open mode in the shutdown logic avoids ineffective repeated actions of the solenoid valve during shutdown, reducing mechanical wear and extending its service life. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the gas path module connection of the present invention; Figure 2 This is the main flowchart of the control method of the present invention; Figure 3 This is a flowchart of the pulse loop sub-process of the present invention; Figure 4 This is a flowchart of the pause detection sub-process of the present invention; Figure 5 This is an electrical connection block diagram of the present invention. Detailed Implementation

[0029] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention: Example 1: Please refer to Figure 1 A pulse jet control system, comprising an air path module and a control module.

[0030] Specifically, the gas path module is connected sequentially along the gas flow direction as follows: a high-pressure gas source, a high-frequency solenoid valve, an airflow switch, a one-way valve, and a handheld air gun. The high-pressure gas source can be an air tank or the output of an air compressor. The handheld air gun is a conventional air gun with a mechanical trigger switch, and it contains no electronic or pneumatic pulse generators. A flexible hose, up to 10 meters long or even longer, can be connected between the one-way valve and the handheld air gun, depending on the actual usage requirements, to accommodate long-distance operations such as car washing and industrial cleaning.

[0031] Specifically, the control module includes an MCU controller and its peripheral drive circuitry. The signal output terminal of the airflow switch is electrically connected to the input terminal of the MCU controller, and the output terminal of the MCU controller is electrically connected to the control coil of the high-frequency solenoid valve via switching devices such as MOSFETs. The MCU controller has firmware pre-programmed with the pulse jet control method of this invention. To facilitate wireless parameter configuration and remote upgrades, the MCU controller preferably uses a chip with integrated Wi-Fi and Bluetooth functions, such as the ESP32 series chip.

[0032] The selection of components in the above-mentioned gas path module is as follows: High-frequency solenoid valve: Select a direct-acting two-position two-way solenoid valve, such as the STNC TM-08 model, which has a response time of less than 10ms, an operating voltage of 24V DC, and can stably support a pulse frequency of up to 10Hz. Airflow switch: Employs a magnetic reed flow switch with a response time of less than 1ms and a contact life exceeding 10 million cycles. Its signal processing circuit consists of a 24V DC power supply connected to the reed switch contact via a 10kΩ current-limiting resistor, then to the GPIO input pin of the MCU. The loop current is approximately 2.4mA, lower than the reed switch's rated current to prevent contact erosion, and higher than the minimum wetting current to ensure contact reliability. One-way valve: A diaphragm-type one-way valve is selected, with an opening pressure of 0.5-2 MPa (preferably 0.1 MPa) and a response time of less than 15 milliseconds. This one-way valve has a fast shut-off characteristic, which can quickly block the backflow of downstream gas after the solenoid valve is closed.

[0033] Handheld jet gun: Uses a commercially available ordinary jet gun, with only a manual mechanical switch, and is inexpensive.

[0034] Example 2: A pulse jet control method I. Please combine Figures 2 to 5 This embodiment describes in detail the pulse jet control method implemented based on the above system. This method is executed by an MCU controller and includes the following steps: Step S1: Standby state After the system is powered on and initialized, the MCU controller keeps the high-frequency solenoid valve in a normally open state. At this time, the gas from the high-pressure gas source passes through the solenoid valve, airflow switch, check valve, and long pipeline to the air inlet of the handheld jet gun. However, since the user has not pulled the trigger, the jet gun outlet is closed, and the entire air circuit is in a static pressure-locked state with no gas flow. Therefore, the airflow switch outputs a "no signal" level. The system waits for user operation in this state.

[0035] Step S2: Start the detection The MCU controller continuously reads the output signal of the airflow switch at millisecond intervals (e.g., 1 millisecond). When the user pulls the trigger of the handheld air gun, the air gun outlet opens, gas begins to flow, and the contacts inside the airflow switch are pushed closed by the gas, changing the output signal from "nothing" to "yes". After detecting this rising edge signal, the MCU controller confirms it through debouncing (e.g., reading a valid level three times consecutively), determining that the user has actively activated the air gun, and the system then enters a pulse loop state.

[0036] Step S3: Pulse Cycle In pulse cycle mode, the MCU controller alternately controls the opening and closing of the high-frequency solenoid valve according to the preset pulse period and duty cycle, thereby outputting pulsed airflow to the handheld jet gun.

[0037] Specifically, within one pulse cycle: During the activation period, the MCU controller outputs an activation signal to the solenoid valve, which opens, allowing high-pressure gas to pass through. The positive pressure pushes open the check valve, and the gas is then ejected from the jet gun outlet through a long pipeline. At this time, the airflow switch detects the continuous airflow and outputs "signal present".

[0038] During the shutdown period, the MCU controller outputs a shutdown signal to the solenoid valve, causing it to close. At this time, the upstream pressure between the solenoid valve outlet and the check valve rapidly decreases, while the long pipeline downstream of the check valve remains filled with high-pressure gas. This high-pressure gas exerts reverse pressure on the check valve, causing its diaphragm to close rapidly. Due to the physical isolation provided by the check valve, downstream gas cannot flow back to the gas flow switch, and the gas flow at the gas flow switch immediately stops. Its output signal becomes "no signal" for a very short time (typically less than 15 milliseconds) after the solenoid valve closes.

[0039] The aforementioned on / off phases are repeated cyclically according to a set frequency and duty cycle, forming a stable pulsed airflow. As a preferred parameter, the pulse frequency can be 2 Hz (i.e., a period of 500 milliseconds), with an on time of 200 milliseconds, an off time of 300 milliseconds, and a duty cycle of 40%. In practical applications, the pulse frequency can be adjusted within the range of 0.2 to 10 Hz, and the duty cycle can be adjusted within the range of 10% to 90%.

[0040] Step S4: Pause detection During the pulse cycle, the MCU controller continuously monitors the output signal of the airflow switch. Once the system detects that the signal changes from "present" to "absent," it immediately performs the following actions: First, immediately stop the pulse cycle: The MCU controller forces the control pin of the high-frequency solenoid valve to the open state (normally open) and clears all pulse timers, no longer performing any periodic on / off actions.

[0041] Second, start accumulating the duration of no signal: The MCU controller starts accumulating the duration for which the airflow switch output signal is "no", usually in milliseconds.

[0042] Third, during the aforementioned accumulation process, the MCU controller simultaneously monitors changes in the airflow switch signal: Case A (Normal No-Flow During Pulse Interval): If, during the accumulation period, the airflow switch signal changes from "no" to "on" again, the current "no signal" state is determined to be a normal off-state interval within the pulse cycle (i.e., the user is still holding the trigger, and the airflow automatically resumes after the system enters the next on-state). At this time, the MCU controller immediately clears the accumulated no-signal time to zero and returns to step S3 above to continue the normal pulse cycle.

[0043] Scenario B (User-Initiated Shutdown): If the cumulative duration of the no-signal operation continues to increase, and the airflow switch signal never returns to "on" during this period, when the cumulative time reaches the preset shutdown threshold, it is determined that the user has released the trigger of the handheld jet gun and actively stopped the operation. At this time, the system exits the pulse cycle and returns to the standby state of step S1. The solenoid valve remains normally open, waiting for the next user operation.

[0044] The principle for setting the shutdown threshold is that the threshold should be significantly greater than the single off-time in the pulse cycle. For example, when the pulse off-time is 300 milliseconds, the shutdown threshold can be set to 2 seconds to reliably distinguish between brief pulse intervals (on the order of 300 milliseconds) and user-initiated shutdowns (on the order of seconds). Those skilled in the art can set the shutdown threshold in the range of 1 to 5 seconds based on the actual pulse frequency and duty cycle used.

[0045] By employing the aforementioned control logic of "stopping the pulse first, then accumulating the time," this invention fundamentally avoids the self-triggered dead loop problem caused by "simultaneous timing and pulse" in existing technologies. Under long pipeline conditions (such as a 10-meter flexible hose), this method can operate stably: when the user pulls the trigger, a pulsed airflow is output; after the user releases the trigger, the system accurately stops when the stop threshold is reached, without any phenomenon of the pulse failing to stop or degenerating into continuous airflow.

[0046] II. Verification of the effectiveness of the control method under long pipeline conditions To verify the reliability of this invention under long pipeline conditions, the following test system was built: the high-pressure gas source pressure was 0.6 MPa, the long pipeline used a nylon hose with an inner diameter of 8 mm and a length of 10 meters, and other components were selected according to the above parameters. The pulse frequency was set to 2 Hz (200 ms for on / 300 ms for off), and the shutdown threshold was 2 seconds.

[0047] The test process and results are as follows: 1. When the user pulls the trigger of the jet gun, the handheld end immediately outputs a periodic pulse of airflow, with a noticeable impact of the airflow.

[0048] 2. The user holds the trigger for about 10 seconds, and the system consistently outputs a stable pulse airflow without any interruption or rhythm disorder.

[0049] 3. After the user releases the trigger, the handheld end stops spraying air, and the solenoid valve drive signal is observed: After the MCU controller detects no signal from the airflow switch, it forces the solenoid valve to remain open and begins accumulating the no-signal time. After about 2 seconds, the system returns to standby mode, and the solenoid valve remains open. This operation was repeated 20 times, and the machine stopped accurately each time without any logic deadlock.

[0050] 4. In contrast, the traditional "time-while-pulse" control logic (i.e., the solenoid valve is still controlled to open and close according to the original cycle during periods without a signal) was tested on the same set of hardware: after the user releases the trigger, the system cannot stop the pulse output, the solenoid valve continues to open and close according to the cycle, and the handheld end continues to spray intermittent airflow, making it impossible to achieve a true shutdown.

[0051] The above verification results fully demonstrate that the present invention, through the "stop the pulse first, then accumulate the time" control logic in step four, combined with the physical isolation effect of the one-way valve, completely solves the logic deadlock problem of the pulse jet system under long pipeline conditions, while fully preserving the user experience of intuitive operation through a handheld mechanical switch.

[0052] Example 3: IoT Parameter Setting and Remote Upgrade To enhance the device's adaptability to different application scenarios, this invention also provides IoT parameter setting and remote upgrade functions. This function is implemented based on the Wi-Fi or Bluetooth module integrated within the MCU controller.

[0053] I. Parameter Setting Process When the system is in standby mode (or during pulse operation), the user can establish a wireless connection with the MCU controller via a smartphone application (APP). The APP interface provides the following adjustable parameter controls: Pulse frequency adjustment slider, range 0.2 to 10 Hz, in 0.1 Hz increments; Duty cycle adjustment slider, range 10% to 90%, in 1% increments; Shutdown threshold setting control, range 0.5 to 5 seconds, in 0.1-second increments; The preset mode selection button includes an energy-saving mode (e.g., 2 Hz frequency, 40% duty cycle), a powerful mode (e.g., 1-2 Hz frequency, 60%-80% duty cycle), and a gentle mode (e.g., 3-5 Hz frequency, 15%-30% duty cycle).

[0054] After the user manually adjusts the parameters or selects a preset mode, the APP sends the configuration parameter package to the MCU controller via Wi-Fi or Bluetooth. Upon receiving the package, the MCU controller verifies the data. If correct, it writes the parameters into its internal non-volatile memory (such as EEPROM or Flash) and immediately updates the period, duty cycle, and stop threshold used in the pulse cycle step, as well as the stop threshold used in the pause detection step. The entire parameter update process does not require power outages or device restarts; the new parameters take effect immediately.

[0055] II. Remote Firmware Upgrade Process When a new control algorithm or function is updated, the mobile app can retrieve the new firmware version information from the cloud and prompt the user to upgrade. After the user confirms the upgrade, the app pushes the binary data fragments of the new firmware to the MCU controller via wireless communication. The MCU controller receives each data fragment and verifies it; after all data has been received, it performs an integrity verification. Once the verification is successful, the MCU controller automatically restarts, enters the bootloader program, writes the new firmware to the program storage area, and completes the upgrade. This function allows deployed equipment to continuously achieve performance optimization and functional expansion without manual on-site maintenance.

[0056] Example 4: The method of the present invention can flexibly adjust the pulse parameters according to the characteristics of the specific cleaning object. Several typical application scenario configurations are given below, but the present invention is not limited to these examples.

[0057] 1. Car body drying: Uses pulsed airflow with a frequency of 2 Hz and a duty cycle of 40%. The pulsed airflow can disturb the boundary layer on the car body surface, accelerating the sliding and dispersal of water droplets, saving about 60% of compressed air consumption compared to continuous airflow.

[0058] 2. Engine compartment or wheel hub dust removal: Use pulsed airflow with a frequency of 1 to 1.5 Hz and a duty cycle of 60%. The lower frequency combined with the stronger impact force is effective in blowing away tightly adhered sludge and dust.

[0059] 3. Dust removal from circuit boards or precision instruments: Use a gentle pulsed airflow with a frequency of 5 Hz and a duty cycle of 15% to 20%. The high-frequency and low-energy pulses can avoid damage to sensitive electronic components caused by high-pressure continuous airflow.

[0060] 4. Garden leaf sweeping: Utilizes pulsed airflow with a frequency of 0.5 Hz and a duty cycle of 80%. The low-frequency, high-energy pulses create a "hammer-like" propulsive effect, making it easy to blow away piles of fallen leaves.

[0061] 5. Dust removal on industrial equipment surfaces: Using pulsed airflow with a frequency of 3 Hz and a duty cycle of 50%, a good balance is achieved between energy saving and cleaning efficiency, making it suitable for long-term continuous operation.

[0062] The parameters in the above scenarios can all be remotely sent via a mobile phone wireless APP without disassembling the device or re-burning the program.

[0063] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention 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 invention should be included within the protection scope of the present invention.

Claims

1. A pulse jet control method, characterized in that, The method is applied to a gas path module, which includes a high-pressure gas source, a high-frequency solenoid valve, a flow switch, a one-way valve, and a handheld jet gun connected in sequence; the method includes the following steps: S1, Standby state: Controls the high-frequency solenoid valve to remain normally open; S2. Start detection: When the output signal of the airflow switch changes from zero to intermittent, the pulse cycle begins; S3, Pulse Cycle: The high-frequency solenoid valve is alternately controlled to open and close according to a preset pulse period and duty cycle to generate pulse airflow; wherein, during the period when the high-frequency solenoid valve is closed, the one-way valve is closed under the action of reverse pressure in the pipeline, so that the output signal of the airflow switch becomes zero; S4. Pause Detection: In S3, when the output signal of the airflow switch is detected to be zero, immediately perform the following operation: Forcefully open the high-frequency solenoid valve and keep it in the normally open state to stop pulse cycle control; Start accumulating the duration during which the output signal is zero; If the output signal becomes active again during the accumulation period, the accumulated value is cleared and the process returns to S3; If the cumulative duration reaches the preset shutdown threshold, then return to S1.

2. The pulse jet control method according to claim 1, characterized in that, The frequency of the pulse period is 0.2-10Hz, and the duty cycle is 10%-90%.

3. The pulse jet control method according to claim 1, characterized in that, The preset shutdown threshold is greater than the single shutdown time in the pulse cycle.

4. The pulse jet control method according to claim 1, characterized in that, The one-way valve is a diaphragm-type one-way valve with an opening pressure of less than 2 MPa and a response time of less than 15 ms.

5. The pulse jet control method according to claim 1, characterized in that, It also includes a parameter setting step: before or during S1, the configuration parameters sent by the external terminal are received through the Internet of Things communication module, and the preset pulse period, duty cycle or shutdown threshold is updated according to the configuration parameters.

6. The pulse jet control method according to claim 5, characterized in that, The external terminal provides a variety of preset operating modes, including at least an energy-saving mode, a powerful mode, and a gentle mode, each corresponding to a different set of pulse period and duty cycle parameters.

7. The pulse jet control method according to claim 5, characterized in that, It also includes a remote upgrade step: during S1, firmware update data is received through the IoT communication module, and a firmware upgrade is performed.

8. A pulse jet control system, characterized in that, include: The air circuit module includes a high-pressure air source, a high-frequency solenoid valve, an airflow switch, a one-way valve, and a handheld air gun connected in sequence; wherein, the airflow switch is used to detect airflow and output an electrical signal; The control module is electrically connected to the airflow switch and the high-frequency solenoid valve, respectively, and the control module is configured as follows: (a) In the standby state, the high-frequency solenoid valve is controlled to remain in the normally open state; (b) When the output signal of the airflow switch changes from zero to sometimes, the on / off state of the high-frequency solenoid valve is alternately controlled according to the preset pulse period and duty cycle to generate pulse airflow; (c) During the alternating control process, when the output signal of the airflow switch is detected to be zero, the high-frequency solenoid valve is forcibly opened and kept in the normally open state, the pulse cycle control is stopped, and the duration of the output signal being zero is accumulated. If the output signal becomes active again during the accumulation period, the alternation control is resumed; if the accumulation duration reaches a preset shutdown threshold, the system returns to the standby state.

9. The pulse jet control system according to claim 8, characterized in that, The airflow switch is a magnetic reed flow switch with a response time of less than 1ms.

10. The pulse jet control system according to claim 8, characterized in that, The high-frequency solenoid valve is a direct-acting solenoid valve with a response time of less than 10ms.

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