Electric air pump control method, device, system and electric air pump

Abstract

The present application relates to a control method, device, system and electric air pump for an electric air pump. During the operation of the electric air pump, it can collect the inflation parameters of the electric air pump in real time, compare and analyze them with the preset inflation parameters, and combine the inflation parameters and the preset inflation parameters to provide a pulse width modulation signal with a corresponding duty cycle for the air pump control circuit. Under the action of the pulse width modulation signal, the air pump control circuit provides a suitable current for the motor pump, so as to realize the inflation operation with constant parameters through the motor pump. This solution can adjust the inflation current of the motor pump by combining the actual inflation parameters during the inflation process, realize the inflation operation with constant parameters, and thus effectively improve the inflation accuracy during the inflation process of the electric air pump.

Description

Technical Field

[0001] The present application relates to the technical field of intelligent devices, and particularly to a control method, device, system and electric air pump for an electric air pump. Background Art

[0002] With the development of science and technology, electric air pumps are widely used for inflating devices such as cars, bicycles, basketballs, swimming rings, air beds, etc., bringing great convenience to people's daily lives.

[0003] However, during the operation of an electric air pump, the inflation operation is stopped only by simply detecting whether the air pressure of the inflation object reaches a preset air pressure value, resulting in low inflation accuracy throughout the inflation process. Summary of the Invention

[0004] Based on this, it is necessary to provide a control method, device, system and electric air pump for an electric air pump to solve the problem of low inflation accuracy during the inflation process of the electric air pump.

[0005] An electric air pump control system includes a main control device, an inflation parameter detection device and an air pump control circuit. The inflation parameter detection device is connected to the main control device and is used to detect the inflation parameters during the operation of the electric air pump. The main control device is connected to the air pump control circuit, and the air pump control circuit is connected to the motor pump. The main control device is used to output a pulse width modulation signal with a corresponding duty cycle to the air pump control circuit according to the inflation parameters and preset inflation parameters. The air pump control circuit is used to output an inflation current to the motor pump according to the pulse width modulation signal to achieve constant parameter inflation.

[0006] In the above electric air pump control system, during the operation of the electric air pump, the inflation parameters of the electric air pump can be obtained in real time, compared and analyzed with the preset inflation parameters. Combining the inflation parameters and the preset inflation parameters, a pulse width modulation signal with a corresponding duty cycle is provided for the air pump control circuit. Under the action of the pulse width modulation signal, the air pump control circuit provides a suitable current for the motor pump, so as to achieve a constant parameter inflation operation through the motor pump. This solution can adjust the inflation current of the motor pump by combining the actual inflation parameters during the inflation process, achieve a constant parameter inflation operation, and thus effectively improve the inflation accuracy during the inflation process of the electric air pump.

[0007] In one embodiment, the inflation parameter detection device includes a pressure detector and / or a rotation speed detector connected to the main control device.

[0008] In one embodiment, the air pump control circuit includes a pulse switch device and a current sampling circuit. The control end of the pulse switch device is connected to the main control device. The first end of the pulse switch device is connected to the motor pump. The motor pump is connected to a power supply. The second end of the pulse switch device is grounded through the current sampling circuit. The current sampling circuit is connected to the main control device.

[0009] In one embodiment, the air pump control circuit further includes a power supply switch device. The first end of the pulse switch device is connected to the power supply switch device. The first end and the second end of the wiring terminal of the motor pump are respectively connected to the power supply switch device. The power supply switch device is connected to the power supply. The power supply switch device is connected to the main control device.

[0010] In one embodiment, the power supply switch device includes a switch device, a relay, and a clamping diode. The control end of the switch device is connected to the main control device. The first end of the switch device is connected to the first end of the coil of the relay. The second end of the switch device is grounded. The second end of the coil of the relay is connected to a relay power supply. The first contact of the relay is connected to the power supply. The second contact of the relay is connected to the first end of the wiring terminal of the motor pump. The third contact of the relay is connected to the anode of the clamping diode and the first end of the pulse switch device. The fourth contact of the relay is connected to the cathode of the clamping diode and the power supply. The fifth contact of the relay is connected to the second end of the wiring terminal of the motor pump. The sixth contact of the relay is connected to the first end of the pulse switch device.

[0011] In one embodiment, the power supply switch device further includes a freewheeling diode and a current limiting resistor. The cathode of the freewheeling diode is connected to the second end of the coil of the relay. The anode of the freewheeling diode is connected to the first end of the switch device. The control end of the switch device is connected to the main control device through the current limiting resistor.

[0012] In one embodiment, the current sampling circuit includes a sampling resistor and a filtering circuit. The first end of the sampling resistor is connected to the second end of the pulse switch device and the filtering circuit. The second end of the sampling resistor is connected to the filtering circuit. The second end of the sampling resistor is grounded. The filtering circuit is connected to the main control device.

[0013] In one embodiment, the current sampling circuit further includes a protection circuit. The filtering circuit is connected to the main control device through the protection circuit.

[0014] In one embodiment, the filtering circuit includes a first resistor, a first capacitor, and a second capacitor. A first end of the first resistor is connected to a first end of the sampling resistor and a second end of the pulse switch device. A second end of the first resistor is connected to a first end of the first capacitor and a first end of the second capacitor. The first end of the second capacitor is connected to the protection circuit. A second end of the first capacitor is connected to a second end of the second capacitor and a second end of the sampling resistor;

[0015] And / or, the protection circuit includes a first diode and a second diode. A cathode of the first diode is connected to a protection power supply. An anode of the first diode is connected to a cathode of the second diode, the filtering circuit, and the main control device. An anode of the second diode is connected to the filtering circuit.

[0016] In one embodiment, the air pump control circuit further includes a second resistor and a third resistor. A first end of the second resistor is connected to the main control device. A second end of the second resistor is connected to a first end of the third resistor and a control end of the pulse switch device. A second end of the third resistor is connected to a second end of the pulse switch device.

[0017] In one embodiment, the electric air pump control system further includes a power management device and / or an interaction device connected to the main control device.

[0018] An electric inflator includes a motor pump and the electric air pump control system according to any one of the above.

[0019] An electric air pump control method based on the electric air pump control system according to any one of the above, includes: if an inflation instruction for constant parameter inflation is received, controlling the electric inflator to start running; acquiring inflation parameters during the operation of the electric inflator; according to the inflation parameters and preset inflation parameters, outputting a pulse width modulation signal with a corresponding duty cycle to the air pump control circuit; the air pump control circuit is configured to output an inflation current to the motor pump according to the pulse width modulation signal to achieve constant parameter inflation.

[0020] In one embodiment, the inflation parameters include inflation pressure, and the preset inflation parameters include preset inflation pressure. The step of outputting a pulse width modulation signal with a corresponding duty cycle to the air pump control circuit according to the inflation parameters and preset inflation parameters includes: if the inflation pressure is greater than the preset inflation pressure, reducing the duty cycle of the pulse width modulation signal output to the air pump control circuit; if the inflation pressure is less than the preset inflation pressure, increasing the duty cycle of the pulse width modulation signal output to the air pump control circuit.

[0021] In one embodiment, the inflation parameter includes the motor speed, the preset inflation parameter includes the preset motor speed, and according to the inflation parameter and the preset inflation parameter, outputting a pulse width modulation signal with a corresponding duty cycle to the air pump control circuit includes: if the motor speed is greater than the preset motor speed, then reducing the duty cycle of the pulse width modulation signal output to the air pump control circuit; if the motor speed is less than the preset motor speed, then increasing the duty cycle of the pulse width modulation signal output to the air pump control circuit.

[0022] An electric air pump control device based on the electric air pump control system described in any one of the above, includes: an opening control module, configured to control the electric air pump to start running if an inflation instruction for constant parameter inflation is received; an inflation parameter acquisition module, configured to acquire the inflation parameter during the operation of the electric air pump; an inflation adjustment module, configured to output a pulse width modulation signal with a corresponding duty cycle to the air pump control circuit according to the inflation parameter and the preset inflation parameter; the air pump control circuit is configured to output an inflation current to the motor pump according to the pulse width modulation signal to achieve constant parameter inflation. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Structural schematic diagram of an electric air pump control system in an embodiment of the present application;

[0025] Figure 2 Structural schematic diagram of an electric air pump control system in another embodiment of the present application;

[0026] Figure 3 Structural schematic diagram of an electric air pump control system in yet another embodiment of the present application;

[0027] Figure 4 Structural schematic diagram of an electric air pump control system in still another embodiment of the present application;

[0028] Figure 5 Structural schematic diagram of an air pump control circuit in an embodiment of the present application;

[0029] Figure 6 Structural schematic diagram of an electric air pump control system in another embodiment of the present application;

[0030] Figure 7Schematic structural diagram of an electric air pump control system in another embodiment of the present application;

[0031] Figure 8 Schematic flow diagram of an electric air pump control method in an embodiment of the present application;

[0032] Figure 9 Schematic flow diagram of an electric air pump control method in another embodiment of the present application;

[0033] Figure 10 Schematic flow diagram of an electric air pump control method in yet another embodiment of the present application;

[0034] Figure 11 Schematic structural diagram of an electric air pump control device in an embodiment of the present application. Detailed implementation manners

[0035] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0036] Please refer to Figure 1 , an electric air pump control system, including a main control device 200, an inflation parameter detection device 100, and an air pump control circuit 300. The inflation parameter detection device 100 is connected to the main control device 200, the main control device 200 is connected to the air pump control circuit 300, and the air pump control circuit 300 is connected to the motor pump 400. The inflation parameter detection device 100 is used to detect the inflation parameters during the operation of the electric air pump; the main control device 200 is used to output a pulse width modulation signal with a corresponding duty cycle to the air pump control circuit 300 according to the inflation parameters and the preset inflation parameters; the air pump control circuit 300 is used to output an inflation current to the motor pump 400 according to the pulse width modulation signal to achieve constant parameter inflation.

[0037] Specifically, the motor pump 400 is the electric pump structure in the electric air pump used to achieve the inflation and deflation functions. It includes a motor, a pump body, etc. During actual operation, only by providing a current of appropriate magnitude to the motor pump 400 can the motor pump 400 be driven to rotate. The inflation parameter detection device 100 is a device for detecting the state parameters during the operation of the electric air pump. According to different inflation parameters, the installation position of the inflation parameter detection device 100 will also vary. If the inflation parameter is the inflation pressure, the inflation parameter detection device 100 needs to be set at the part where the electric air pump is connected to the object to be inflated. The specific type of the main control device 200 is not unique. For example, in one embodiment, an MCU (Microcontroller Unit) can be used as the main control device 200.

[0038] After the main control device 200 learns that the user has a need for constant parameter inflation, during the operation of the electric air pump, it will receive the inflation parameters collected and sent by the inflation parameter detection device 100, and in combination with the preset inflation parameters pre-set by the user in the main control device 200, adjust the pulse width modulation signal (PWM, Pulse Width Modulation) output to the air pump control circuit 300 in real time. The air pump control circuit 300 can then output a corresponding inflation current to the motor pump 400 according to the received pulse width modulation signal to control the operation of the motor pump 400. During this process, through real-time feedback regulation of the inflation parameters, the electric air pump can ultimately maintain a state matching the preset inflation parameters to achieve constant parameter inflation.

[0039] During this process, first, the main control device 200 obtains the inflation instruction for constant parameter inflation from the user, and under the action of this instruction, controls the electric air pump to start running. Then, during the operation of the electric air pump, it obtains the inflation parameters during the operation of the electric air pump. Finally, according to the inflation parameters and the preset inflation parameters, it adjusts the duty cycle of the pulse width modulation signal output to the air pump control circuit 300 to achieve constant parameter inflation.

[0040] It can be understood that before sending the inflation instruction, or before sending the inflation instruction, the user will pre-set the required preset inflation parameters in the main control device 200. When the electric air pump starts running, it will first run with the operating parameters corresponding to the preset inflation parameters. During the operation of the electric air pump, the inflation parameters are monitored in real time. If it is detected that the inflation parameters deviate from the preset inflation parameters, at this time, the main control device 200 will adjust the duty cycle of the pulse width modulation signal output to the air pump control circuit 300 in a feedback regulation manner to change the inflation current when the motor pump 400 operates, and further adjust the inflation parameters during the inflation process, ultimately making the inflation parameters match the preset inflation parameters to achieve constant parameter inflation.

[0041] It should be noted that the specific type of constant-parameter inflation is not unique. In one embodiment, the constant-parameter inflation can be constant-pressure inflation. Correspondingly, the inflation parameter includes the inflation air pressure, the preset inflation parameter includes the preset inflation air pressure. According to the inflation parameter and the preset inflation parameter, the duty cycle of the pulse-width modulation signal output to the air pump control circuit 300 is adjusted to achieve constant-parameter inflation, including: if the inflation air pressure is greater than the preset inflation air pressure, the duty cycle of the pulse-width modulation signal output to the air pump control circuit 300 is reduced; if the inflation air pressure is less than the preset inflation air pressure, the duty cycle of the pulse-width modulation signal output to the air pump control circuit 300 is increased to achieve constant-pressure inflation.

[0042] Specifically, when constant-pressure inflation (constant air pressure inflation) is required, the main control device 200 compares the preset inflation air pressure set by the user with the detected inflation air pressure. When the inflation air pressure is lower than the preset inflation air pressure, by controlling the increase of the duty cycle of the PWM, the current flowing through the motor pump 400 is increased to increase the rotation speed of the motor pump 400 to achieve a pressurizing effect. On the contrary, when the inflation air pressure is greater than the preset inflation air pressure, the duty cycle of the PWM is controlled to decrease to reduce the current flowing through the motor pump 400 to reduce the rotation speed of the motor pump 400 to achieve the effect of reducing the inflation pressure.

[0043] In another embodiment, the constant-parameter inflation can be constant-flow inflation. In an electric air pump, since the volume of the cylinder for compressing gas is fixed, the inflation flow rate is proportional to the rotation speed of the motor pump 400. Therefore, there is a one-to-one correspondence between the inflation flow rate and the rotation speed of the motor pump 400, and the inflation flow rate can be characterized by the rotation speed of the motor pump 400. Therefore, in the solution of this embodiment, the inflation parameter includes the motor rotation speed, the preset inflation parameter includes the preset motor rotation speed. According to the inflation parameter and the preset inflation parameter, the duty cycle of the pulse-width modulation signal output to the air pump control circuit 300 is adjusted to achieve constant-parameter inflation, including: if the motor rotation speed is greater than the preset motor rotation speed, the duty cycle of the pulse-width modulation signal output to the air pump control circuit 300 is reduced; if the motor rotation speed is less than the preset motor rotation speed, the duty cycle of the pulse-width modulation signal output to the air pump control circuit 300 is increased to achieve constant-flow inflation.

[0044] Specifically, during the actual operation of the motor pump 400, the main control device 200 detects whether the current motor speed matches the preset motor speed, that is, detects whether the current motor speed matches the required inflation flow rate. When the motor speed is greater than the speed corresponding to the required inflation flow rate (i.e., the preset motor speed), the main control device 200 reduces the PWM duty cycle output, and by reducing the inflation current output to the motor pump 400, reduces the speed of the motor pump 400 to the preset motor speed. Conversely, the main control device 200 increases the PWM duty cycle and, by increasing the inflation current of the motor pump 400, raises the speed of the motor pump 400 to the preset motor speed.

[0045] In the above electric air pump control system, during the operation of the electric air pump, it can acquire and collect the inflation parameters of the electric air pump in real time, compare and analyze them with the preset inflation parameters, and based on the inflation parameters and the preset inflation parameters, provide a pulse width modulation signal with an appropriate duty cycle for the air pump control circuit 300. Under the action of the pulse width modulation signal, the air pump control circuit 300 provides a current of appropriate magnitude for the motor pump 400, thereby realizing an inflation operation with constant parameters through the motor pump 400. This solution can adjust the inflation current of the motor pump 400 in combination with the actual inflation parameters during the inflation process, realize an inflation operation with constant parameters, and thus effectively improve the inflation accuracy during the inflation process of the electric air pump.

[0046] Please refer to Figure 2 , in one embodiment, an inflation structure member 510 and an air extraction structure member 520 are connected to the motor pump 400. Correspondingly, in the solution of this embodiment, the main control device 200 can also finally control the motor pump 400 to perform inflation work or air extraction work according to different received task signals. This solution enables the electric air pump to also have an air extraction function, thereby expanding the application range of the motor pump 400.

[0047] Please refer to Figure 2 , in one embodiment, the inflation parameter detection device 100 includes a pressure detector 110 and / or a speed detector 120 connected to the main control device 200.

[0048] Specifically, the air pressure detector 110 is a device capable of detecting the air pressure of the object to be inflated, and the rotational speed detector 120 is a device for detecting the actual rotational speed of the motor pump 400. In an actual application scenario, in order to detect the air pressure of the object to be inflated, the air pressure detector 110 needs to be set at the part of the electric air pump that communicates with the object to be inflated, such as the end of the gas transmission pipeline of the electric air pump. In order to detect the motor speed, the rotational speed detector 120 needs to be set at the motor pump 400, and it can be set according to the actual situation. In this solution, the inflation parameter detection device 100 can be the air pressure detector 110 and / or the rotational speed detector 120, so as to collect the inflation air pressure and the motor speed during the operation of the electric air pump. Furthermore, combined with the preset inflation parameters, constant-pressure inflation or constant-flow inflation can be achieved, improving the inflation convenience of the electric air pump.

[0049] Please refer to Figure 3 , in one embodiment, the air pump control circuit 300 includes a pulse switch device Q1 and a current sampling circuit 310. The control end of the pulse switch device Q1 is connected to the main control device 200, the first end of the pulse switch device Q1 is connected to the motor pump 400, the motor pump 400 is connected to the power supply, the second end of the pulse switch device Q1 is grounded through the current sampling circuit 310, and the current sampling circuit 310 is connected to the main control device 200.

[0050] Specifically, the pulse switch device Q1 is a device that turns on and off under the action of the pulse width modulation signal output by the main control device 200 to realize current transmission. The current sampling circuit 310 is used to sample the current output to the motor pump 400. In the solution of this embodiment, a pulse switch device Q1 is provided in the air pump control circuit 300, and the magnitude of the inflation current output to the motor pump 400 is adjusted by the ratio of the on-time to the off-time of the pulse switch device Q1. At the same time, a current sampling circuit 310 is also provided. Through this circuit, the main control device 200 can detect the magnitude of the inflation current output to the motor pump 400, improving the operation reliability of the electric air pump.

[0051] It can be understood that in one embodiment, in order to ensure the safe and stable operation of the pulse switch device Q1, a voltage stabilizing diode can be set between the control end and the second end, or between the control end and the first end of the pulse switch device Q1. Further, two voltage stabilizing diodes can be set in reverse series to improve the operation reliability of the air pump control circuit.

[0052] Please refer to Figure 4, in one embodiment, the air pump control circuit 300 further includes a power supply switch device 320. The first end of the pulse switch device Q1 is connected to the power supply switch device 320. The first end J1 and the second end J2 of the terminal of the motor pump 400 are respectively connected to the power supply switch device 320. The power supply switch device 320 is connected to the power supply, and the power supply switch device 320 is connected to the main control device 200.

[0053] Specifically, the power supply switch device 320 is a device used to control the connection and disconnection between the motor pump 400 and the power supply. In the solution of this embodiment, a power supply switch device 320 is provided between the power supply and the motor pump 400. The power supply switch device 320 is connected to the main control device 200 and is turned on and off under the control of the main control device 200, so as to determine whether to supply power to the motor pump 400 through the power supply.

[0054] Furthermore, in one embodiment, the power supply switch device 320 also has the function of changing the current flow direction in the motor pump 400. By controlling the conduction of different lines in the power supply switch device 320, the power supply flows in from the first end J1 of the terminal of the motor pump 400 and flows out from the second end J2 of the terminal; or it controls the power supply to flow in from the second end J2 of the terminal of the motor pump 400 and flow out from the first end J1 of the terminal. Under the action of different flowing currents, the motor pump 400 can rotate forward or backward. The inflation task is realized by the forward rotation of the motor pump 400, while the reverse rotation of the motor pump 400 can realize the air extraction task.

[0055] It should be noted that the specific structure of the power supply switch device 320 is not unique, as long as it can realize the above switch function, control the power supply to flow into the motor pump 400 or change the current direction flowing into the motor pump 400.

[0056] For example, in a more detailed embodiment, please refer to Figure 5 , the power supply switch device 320 includes a switch device Q2, a relay S and a clamping diode D1. The control end of the switch device Q2 is connected to the main control device 200. The first end of the switch device Q2 is connected to the first end of the coil of the relay S. The second end of the switch device Q2 is grounded. The second end of the coil of the relay S is connected to the relay power supply. The first contact of the relay S is connected to the power supply. The second contact of the relay S is connected to the first end J1 of the terminal of the motor pump 400. The third contact of the relay S is connected to the anode of the clamping diode D1 and the first end of the pulse switch device Q1. The fourth contact of the relay S is connected to the cathode of the clamping diode D1 and the power supply. The fifth contact of the relay S is connected to the second end J2 of the terminal of the motor pump 400. The sixth contact of the relay S is connected to the first end of the pulse switch device Q1.

[0057] Specifically, the relay S adopted in the solution of this embodiment is specifically a double-pole double-throw relay. By the coil of the relay S being in two different states of being powered on or powered off, the direction of current flowing through the relay S can be changed. The control end of the switching device Q2 is connected to the main control device 200. Under the control of the main control device 200, the switching device Q2 can be turned on or off. When the switching device Q2 is turned on, the coil of the relay S will be in a powered-on state; when the switching device Q2 is turned off, the coil of the relay S will be in a powered-off state.

[0058] When, under the control of the main control device 200, the relay S is in a powered-on state, the first contact and the second contact of the relay S are connected, and the fifth contact and the sixth contact are connected. The power supply flows from the first contact of the relay S to the second contact of the relay S, and then flows into the first end J1 of the wiring terminal connected to the second contact. That is, at this time, the current flows into the motor pump 400 from the first end J1 of the wiring terminal and flows out from the second end J2 of the wiring terminal, and then flows to the first end of the pulse switching device Q1 through the fifth contact and the sixth contact of the relay S. The pulse switching device Q1 is turned on and off under the action of the PWM signal output by the main control device 200. When the pulse switching device Q1 is turned on, the current can flow through the pulse switching device Q1 and then return to the ground terminal to form a loop, realizing the power supply to the motor pump 400. When the pulse switching device Q1 is turned off, an effective loop cannot be formed, and at this time, no current will flow through the motor pump 400. At the same time, in the solution of this embodiment, a clamping diode D1 is provided between the third contact and the fourth contact of the relay S to ensure the safe operation of the relay S.

[0059] Under the action of the main control device 200, when the coil of the relay S is in a powered-off state, the second contact and the third contact of the relay S are connected, and the fourth contact and the fifth contact are connected. At this time, the power supply flows into the fifth contact through the fourth contact and then flows into the second end J2 of the wiring terminal connected thereto through the fifth contact, and then flows into the second contact of the relay S from the first end J1 of the wiring terminal and finally flows to the first end of the pulse switching device Q1 through the third contact of the relay S. In this state, the current flow direction of the wiring terminal will be opposite to that when the coil of the relay S is powered on, and thus the reverse rotation control of the motor pump 400 can be realized. This solution uses a double-pole double-throw switch to realize the switching of the current flow direction in the motor pump 400, and has the advantages of low circuit cost and strong reliability of the control method.

[0060] It can be understood that neither the relay power supply nor the power supply size is unique, and specific different selections can be made in combination with actual requirements. For example, in a more detailed embodiment, the relay power supply can be set to 5V, and the power supply for the electric air pump can be set to 12V.

[0061] Further, please refer to Figure 5, in one embodiment, the power supply switch device 320 further includes a freewheeling diode D2 and a current limiting resistor R1. The cathode of the freewheeling diode D2 is connected to the second end of the coil of the relay S, the anode of the freewheeling diode D2 is connected to the first end of the switching device Q2, and the control end of the switching device Q2 is connected to the main control device 200 through the current limiting resistor R1.

[0062] Specifically, in the solution of this embodiment, a freewheeling diode D2 is further provided between the first end and the second end of the coil of the relay S. When the coil of the relay S is powered off, freewheeling is performed through the freewheeling diode D2 to improve the operating safety of the relay S. In another embodiment, a current limiting resistor R1 can also be provided between the switching device Q2 and the main control device 200 to ensure the safe operation of the switching device Q2 and effectively improve the safety of the power supply switch device 320.

[0063] Please refer to Figure 5 , in one embodiment, the current sampling circuit 310 includes a sampling resistor R2 and a filtering circuit 311. The first end of the sampling resistor R2 is connected to the second end of the pulse switching device Q1 and the filtering circuit 311, the second end of the sampling resistor R2 is connected to the filtering circuit 311, the second end of the sampling resistor R2 is grounded, and the filtering circuit 311 is connected to the main control device 200.

[0064] Specifically, since the pulse switching device Q1 is turned on and off under the action of the PWM signal to implement the power supply operation for the motor pump 400, correspondingly, a pulsating DC voltage will be generated at the sampling resistor R2. To ensure a stable DC current is sampled subsequently, a filtering circuit 311 needs to be provided between the sampling resistor R2 and the main control device 200 to filter the pulsating DC voltage generated at the sampling resistor R2, so as to facilitate the sampling of the charging current at the main control device 200.

[0065] Please continue to refer to Figure 5 , in one embodiment, the current sampling circuit 310 further includes a protection circuit 312, and the filtering circuit 311 is connected to the main control device 200 through the protection circuit 312.

[0066] Specifically, in the solution of this embodiment, to avoid damage to the main control device 200 during the current sampling process and ensure the safe and stable operation of the electric air pump control system, a protection circuit 312 is further provided between the filtering circuit 311 and the main control device 200 to protect the main control device 200 to operate safely.

[0067] Please refer to Figure 5, in one embodiment, the filter circuit 311 includes a first resistor R3, a first capacitor C1, and a second capacitor C2. The first end of the first resistor R3 is connected to the first end of the sampling resistor R2 and the second end of the pulse switch device Q1. The second end of the first resistor R3 is connected to the first end of the first capacitor C1 and the first end of the second capacitor C2. The first end of the second capacitor C2 is connected to the protection circuit 312. The second end of the first capacitor C1 is connected to the second end of the second capacitor C2 and the second end of the sampling resistor R2;

[0068] And / or, the protection circuit 312 includes a first diode D3 and a second diode D4. The cathode of the first diode D3 is connected to the protection power supply. The anode of the first diode D3 is connected to the cathode of the second diode D4, the filter circuit 311, and the main control device 200. The anode of the second diode D4 is connected to the filter circuit 311.

[0069] Specifically, a filter network is built by the first resistor R3, the first capacitor C1, and the second capacitor C2 to filter the pulsating voltage at the sampling resistor R2, so as to ensure that the main control device 200 can collect a stable charging current. At the same time, a protection circuit 312 can also be built between the filter circuit 311 and the main control device 200 by using the first diode D3 and the second diode D4 to protect the port of the main control device 200 for current sampling.

[0070] In a more detailed embodiment, the filter circuit 311 includes a first resistor R3, a first capacitor C1, and a second capacitor C2. At the same time, the protection circuit 312 includes a first diode D3 and a second diode D4. Among them, the first end of the second capacitor C2 is connected to the anode of the first diode D3, the cathode of the second diode D4, and the main control device 200. The anode of the second diode D4 is connected to the second end of the second capacitor C2.

[0071] It can be understood that the magnitude of the protection power supply is not unique and can be selected in combination with the types of the first diode D3 and the second diode D4 selected. For example, in a more detailed embodiment, the protection power supply can be set to a 5V power supply. It should be noted that in other embodiments, the filter circuit 311 can also adopt other types as long as it can filter the pulsating voltage at the sampling resistor R2 to achieve current sampling.

[0072] Please refer to Figure 5 , in one embodiment, the air pump control circuit 300 further includes a second resistor R4 and a third resistor R5. The first end of the second resistor R4 is connected to the main control device 200. The second end of the second resistor R4 is connected to the first end of the third resistor R5 and the control end of the pulse switch device Q1. The second end of the third resistor R5 is connected to the second end of the pulse switch device Q1.

[0073] Specifically, in the solution of this embodiment, a second resistor R4 and a third resistor R5 are further provided between the pulse switch device Q1 and the main control device 200 to ensure the safe operation of the pulse switch device Q1 and further improve the operation reliability of the electric air pump.

[0074] It should be noted that the specific types of the pulse switch device Q1 and the switch device Q2 are not unique. As long as the switching function can be realized, specifically, a triode, a field effect transistor, a thyristor, an insulated gate bipolar transistor, etc. can be selected according to actual needs, and no specific limitation is made.

[0075] Please refer to Figure 6 , in one embodiment, the electric air pump control system further includes a power management device 700 and / or an interaction device 600 connected to the main control device 200.

[0076] Specifically, the interaction device 600 is a device used to realize the information interaction between the user and the electric air pump. Through the interaction device 600, the user can send a working instruction of inflating or exhausting air to the electric air pump so that the electric air pump realizes the functions of inflating or exhausting air. At the same time, the preset inflation parameters can also be set for the electric air pump through the interaction device 600, such as the preset inflation pressure or the preset motor speed, and then an instruction of constant pressure inflation or constant flow inflation is sent to the electric air pump so that the electric air pump realizes constant pressure inflation or constant flow inflation.

[0077] The power management device 700 is a device that provides charging and power supply services for the electric air pump. The power management device 700 is connected to the main control device 200 and can provide a working power supply for the main control device 200, or realize the power management function under the control of the main control device 200. At the same time, the power management device 700 is also connected to the air pump control circuit 300 to supply power to the air pump control circuit 300.

[0078] It can be understood that the specific type of the power management device 700 is not unique. In one embodiment, please refer to Figure 7 , the power management device 700 includes a power manager 710 and an energy storage device 720. The power manager 710 is connected to the energy storage device 720 and the main control device 200, and the energy storage device 720 is connected to the air pump control circuit 300 to provide a working power supply for the air pump control circuit 300. The specific type of the energy storage device 720 is not unique. In a more detailed embodiment, it can be a storage battery.

[0079] In the solution of this embodiment, when the energy storage device 720 is charging, the electric air pump does not work. The main control device 200 controls the power manager 710 to charge the energy storage device 720, and automatically cuts off the power when the energy storage device 720 is full. When the user has a need for inflation or deflation, the energy storage device 720 provides electrical energy for the air pump control circuit 300, so as to provide the current required for the operation of the motor pump 400.

[0080] In a more detailed embodiment, the power management device 700 further includes a USB (Universal Serial Bus) port 730. In this solution, through the setting of the USB port 730, the electric air pump can be set as a portable electric air pump, and it can be directly charged through the USB port 730 when there is a charging need.

[0081] It should be noted that the specific type of the interaction device 600 is not unique. It can be an interaction device 600 of the mechanical button type or an interaction device 600 of the touch display screen type. It can be specifically selected according to the actual needs, and no specific limitation is made.

[0082] An electric air pump includes the electric air pump control system of any one of the above-mentioned motor pumps.

[0083] Specifically, the electric air pump control system is as shown in the above-mentioned various embodiments and the drawings, and will not be elaborated here. In this solution, during the operation of the electric air pump, the inflation parameters of the electric air pump can be collected in real time, compared and analyzed with the preset inflation parameters. Combining the inflation parameters and the preset inflation parameters, a pulse width modulation signal with a corresponding duty cycle is provided for the air pump control circuit 300. Under the action of the pulse width modulation signal, the air pump control circuit 300 provides a suitable current for the motor pump 400, so as to realize the inflation operation with constant parameters through the motor pump 400. This solution can adjust the inflation current of the motor pump 400 in combination with the actual inflation parameters during the inflation process, realize the inflation operation with constant parameters, and thus effectively improve the inflation accuracy of the electric air pump during the inflation process.

[0084] Please refer to Figure 8 , an electric air pump control method based on the electric air pump control system of any one of the above, includes step 810, step 820 and step 830.

[0085] Step 810, if an inflation instruction for constant parameter inflation is received, control the electric air pump to start running; Step 820, obtain the inflation parameters during the operation of the electric air pump; Step 830, according to the inflation parameters and the preset inflation parameters, output a pulse width modulation signal with a corresponding duty cycle to the air pump control circuit.

[0086] Specifically, the air pump control circuit is used to output an inflation current to the motor pump according to a pulse width modulation signal to achieve constant parameter inflation. The electric air pump control system is as shown in the above embodiments and the accompanying drawings. This method is applied to the main control device 200. The motor pump 400 is the electric pump structure in the electric air pump used to achieve the inflation and deflation functions. It includes a motor, a pump body, etc. During actual operation, only by providing a suitable current to the motor pump 400 can the motor pump 400 be driven to rotate. The inflation parameter detection device 100 is a device for detecting the state parameters during the operation of the electric air pump. According to different inflation parameters, the installation position of the inflation parameter detection device 100 will also be different. If the inflation parameter is the inflation pressure, the inflation parameter detection device 100 needs to be set at the part where the electric air pump is connected to the object to be inflated.

[0087] After the main control device 200 learns that the user has a need for constant parameter inflation, during the operation of the electric air pump, it will receive the inflation parameters collected and sent by the inflation parameter detection device 100, and combine the preset inflation parameters pre-set by the user in the main control device 200 to adjust the pulse width modulation signal (PWM, Pulse Width Modulation) output to the air pump control circuit 300 in real time. The air pump control circuit 300 can then output a corresponding inflation current to the motor pump 400 according to the received pulse width modulation signal to control the operation of the motor pump 400. During this process, through real-time feedback adjustment of the inflation parameters, the electric air pump can finally maintain a state matching the preset inflation parameters to achieve constant parameter inflation.

[0088] During this process, first, the main control device 200 obtains the inflation instruction for constant parameter inflation from the user, and under the action of this instruction, controls the electric air pump to start running. Then, during the operation of the electric air pump, it obtains the inflation parameters during the operation of the electric air pump. Finally, according to the inflation parameters and the preset inflation parameters, it adjusts the duty cycle of the pulse width modulation signal output to the air pump control circuit 300 to achieve constant parameter inflation.

[0089] It can be understood that before sending the inflation instruction, or before sending the inflation instruction, the user will pre-set the required preset inflation parameters in the main control device 200. When the electric air pump starts to run, it will first run with the operating parameters corresponding to the preset inflation parameters. During the operation of the electric air pump, inflation parameter detection is carried out in real time. If it is detected that the inflation parameter deviates from the preset inflation parameter, at this time, the main control device 200 will adjust the duty cycle of the pulse width modulation signal output to the air pump control circuit 300 in a feedback adjustment manner to change the inflation current when the motor pump 400 operates, and then adjust the inflation parameters during the inflation process, and finally make the inflation parameters match the preset inflation parameters to achieve constant parameter inflation.

[0090] Please refer to Figure 9 , in one embodiment, the inflation parameter includes the inflation pressure, the preset inflation parameter includes the preset inflation pressure, and step 830 includes step 910 and step 920.

[0091] Step 910, if the inflation pressure is greater than the preset inflation pressure, then reduce the duty cycle of the pulse width modulation signal output to the air pump control circuit; step 920, if the inflation pressure is less than the preset inflation pressure, then increase the duty cycle of the pulse width modulation signal output to the air pump control circuit.

[0092] Specifically, when constant-pressure inflation (constant air pressure inflation) is required, the main control device 200 compares the preset inflation pressure set by the user with the detected inflation pressure. When the inflation pressure is lower than the preset inflation pressure, by controlling the increase of the PWM duty cycle, the current flowing through the motor pump 400 is increased to increase the rotation speed of the motor pump 400 to achieve a pressurizing effect. Conversely, when the inflation pressure is greater than the preset inflation pressure, the PWM duty cycle is controlled to decrease, so as to reduce the current flowing through the motor pump 400 and reduce the rotation speed of the motor pump 400 to achieve the effect of reducing the inflation pressure.

[0093] Please refer to Figure 10 , in one embodiment, the inflation parameter includes the motor speed, the preset inflation parameter includes the preset motor speed, and step 830 includes step 102 and step 104.

[0094] Step 102, if the motor speed is greater than the preset motor speed, then reduce the duty cycle of the pulse width modulation signal output to the air pump control circuit; step 104, if the motor speed is less than the preset motor speed, then increase the duty cycle of the pulse width modulation signal output to the air pump control circuit.

[0095] Specifically, in an electric air pump, since the volume of the cylinder for compressing gas is fixed, the inflation flow rate is proportional to the rotation speed of the motor pump 400. Therefore, the inflation flow rate and the rotation speed of the motor pump 400 are in a one-to-one correspondence relationship, and the inflation flow rate can be characterized by the rotation speed of the motor pump 400. During the actual operation of the motor pump 400, the main control device 200 detects whether the current motor speed matches the preset motor speed, that is, detects whether the current motor speed matches the required inflation flow rate. When the motor speed is greater than the rotation speed corresponding to the required inflation flow rate (that is, the preset motor speed), the main control device 200 reduces the PWM duty cycle output, and by reducing the inflation current output to the motor pump 400, the rotation speed of the motor pump 400 is reduced to the preset motor speed. Conversely, the main control device 200 increases the PWM duty cycle, and by increasing the inflation current of the motor pump 400, the rotation speed of the motor pump 400 is increased to the preset motor speed.

[0096] In the above electric air pump control method, during the operation of the electric air pump, the inflation parameters of the electric air pump can be obtained in real time for acquisition, and compared and analyzed with the preset inflation parameters. Combining the inflation parameters and the preset inflation parameters, a pulse width modulation signal with a corresponding duty cycle is provided for the air pump control circuit 300. Under the action of the pulse width modulation signal, the air pump control circuit 300 provides a suitable current for the motor pump 400, so as to realize the inflation operation with constant parameters through the motor pump 400. This solution can adjust the inflation current of the motor pump 400 in combination with the actual inflation parameters during the inflation process, realize the inflation operation with constant parameters, and effectively improve the inflation accuracy of the electric air pump during the inflation process.

[0097] It should be understood that although the steps in the flowcharts involved in the above embodiments are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or steps or stages in other steps.

[0098] Based on the same inventive concept, the embodiments of the present application also provide an electric air pump control device for implementing the above-mentioned electric air pump control method. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the electric air pump control device provided below can refer to the limitations on the electric air pump control method in the above text, and will not be repeated here.

[0099] In one embodiment, as Figure 11 shown, an electric air pump control device based on any of the above electric air pump control systems is provided, including an on / off control module 112, an inflation parameter acquisition module 114, and an inflation adjustment module 116.

[0100] The on / off control module 112 is used to control the electric air pump to start running if an inflation instruction for constant parameter inflation is received; the inflation parameter acquisition module 114 is used to acquire the inflation parameters during the operation of the electric air pump; the inflation adjustment module 116 is used to output a pulse width modulation signal with a corresponding duty cycle to the air pump control circuit according to the inflation parameters and the preset inflation parameters.

[0101] In one embodiment, the inflation parameter includes the inflation air pressure, the preset inflation parameter includes the preset inflation air pressure, and the inflation adjustment module 116 is further configured to: if the inflation air pressure is greater than the preset inflation air pressure, reduce the duty cycle of the pulse width modulation signal output to the air pump control circuit; if the inflation air pressure is less than the preset inflation air pressure, increase the duty cycle of the pulse width modulation signal output to the air pump control circuit.

[0102] In one embodiment, the inflation parameter includes the motor speed, the preset inflation parameter includes the preset motor speed, and the inflation adjustment module 116 is further configured to: if the motor speed is greater than the preset motor speed, reduce the duty cycle of the pulse width modulation signal output to the air pump control circuit; if the motor speed is less than the preset motor speed, increase the duty cycle of the pulse width modulation signal output to the air pump control circuit.

[0103] During the operation of the electric air pump, the above-mentioned electric air pump control device can collect the inflation parameters of the electric air pump in real time, compare and analyze them with the preset inflation parameters, and provide a pulse width modulation signal with a corresponding duty cycle for the air pump control circuit in combination with the inflation parameters and the preset inflation parameters. Under the action of the pulse width modulation signal, the air pump control circuit provides a suitable current for the motor pump, so as to realize the inflation operation with constant parameters through the motor pump. This solution can adjust the inflation current of the motor pump in combination with the actual inflation parameters during the inflation process, realize the inflation operation with constant parameters, and thus effectively improve the inflation accuracy of the electric air pump during the inflation process.

[0104] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0105] The above embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An electric air pump control system, characterized in that, Comprising: The main control device; An inflation parameter detection device, the inflation parameter detection device is connected to the main control device, and the inflation parameter detection device is used to detect the inflation parameters during the operation of the electric air pump; An air pump control circuit, the main control device is connected to the air pump control circuit, the air pump control circuit is connected to the motor pump, and the main control device is used to output a pulse width modulation signal with a corresponding duty cycle to the air pump control circuit according to the inflation parameters and the preset inflation parameters; the air pump control circuit is used to output an inflation current to the motor pump according to the pulse width modulation signal to achieve constant parameter inflation; The inflation parameter detection device includes a pressure detector and / or a rotational speed detector connected to the main control device; the air pump control circuit includes a pulse switch device and a current sampling circuit, the control end of the pulse switch device is connected to the main control device, the first end of the pulse switch device is connected to the motor pump, the motor pump is connected to the power supply, the second end of the pulse switch device is grounded through the current sampling circuit, and the current sampling circuit is connected to the main control device.

2. The electric air pump control system according to claim 1, wherein, The air pump control circuit further includes a power supply switch device, the first end of the pulse switch device is connected to the power supply switch device, the first end and the second end of the wiring terminal of the motor pump are respectively connected to the power supply switch device, the power supply switch device is connected to the power supply, and the power supply switch device is connected to the main control device.

3. The electric air pump control system according to claim 2, wherein The power supply switch device includes a switch device, a relay and a clamping diode, the control end of the switch device is connected to the main control device, the first end of the switch device is connected to the first end of the coil of the relay, the second end of the switch device is grounded, the second end of the coil of the relay is connected to the relay power supply, the first contact of the relay is connected to the power supply, the second contact of the relay is connected to the first end of the wiring terminal of the motor pump, the third contact of the relay is connected to the anode of the clamping diode and the first end of the pulse switch device, the fourth contact of the relay is connected to the cathode of the clamping diode and the power supply, the fifth contact of the relay is connected to the second end of the wiring terminal of the motor pump, and the sixth contact of the relay is connected to the first end of the pulse switch device.

4. The electric air pump control system according to claim 3, characterized in that, The power supply switch device further includes a freewheeling diode and a current limiting resistor, the cathode of the freewheeling diode is connected to the second end of the coil of the relay, the anode of the freewheeling diode is connected to the first end of the switch device, and the control end of the switch device is connected to the main control device through the current limiting resistor.

5. The electric air pump control system according to any one of claims 1-4, characterized in that, The current sampling circuit includes a sampling resistor and a filtering circuit, the first end of the sampling resistor is connected to the second end of the pulse switch device and the filtering circuit, the second end of the sampling resistor is connected to the filtering circuit, the second end of the sampling resistor is grounded, and the filtering circuit is connected to the main control device.

6. The electric air pump control system according to claim 5, characterized in that, The current sampling circuit further includes a protection circuit, and the filtering circuit is connected to the main control device through the protection circuit.

7. The electric air pump control system according to claim 6, characterized in that, The filtering circuit includes a first resistor, a first capacitor and a second capacitor. The first end of the first resistor is connected to the first end of the sampling resistor and the second end of the pulse switch device. The second end of the first resistor is connected to the first end of the first capacitor and the first end of the second capacitor. The first end of the second capacitor is connected to the protection circuit. The second end of the first capacitor is connected to the second end of the second capacitor and the second end of the sampling resistor; And / or, the protection circuit includes a first diode and a second diode. The cathode of the first diode is connected to the protection power supply. The anode of the first diode is connected to the cathode of the second diode, the filtering circuit and the main control device. The anode of the second diode is connected to the filtering circuit.

8. The electric air pump control system according to claim 1, wherein, The air pump control circuit further includes a second resistor and a third resistor. The first end of the second resistor is connected to the main control device. The second end of the second resistor is connected to the first end of the third resistor and the control end of the pulse switch device. The second end of the third resistor is connected to the second end of the pulse switch device.

9. The electric air pump control system according to claim 1, characterized in that It further includes a power management device and / or an interaction device connected to the main control device.

10. An electric air pump, characterized in that, It includes a motor pump and the electric air pump control system according to any one of claims 1-9.

11. An electric air pump control method based on the electric air pump control system according to any one of claims 1-9, characterized in that, It includes: If an inflation instruction for constant parameter inflation is received, control the electric inflator to start running; Obtain the inflation parameters during the operation of the electric inflator; According to the inflation parameters and the preset inflation parameters, output a pulse width modulation signal with a corresponding duty cycle to the air pump control circuit; the air pump control circuit is used to output an inflation current to the motor pump according to the pulse width modulation signal to achieve constant parameter inflation.

12. The electric air pump control method according to claim 11, wherein The inflation parameters include inflation pressure, and the preset inflation parameters include preset inflation pressure. According to the inflation parameters and the preset inflation parameters, outputting a pulse width modulation signal with a corresponding duty cycle to the air pump control circuit includes: If the inflation pressure is greater than the preset inflation pressure, reduce the duty cycle of the pulse width modulation signal output to the air pump control circuit; If the inflation pressure is less than the preset inflation pressure, increase the duty cycle of the pulse width modulation signal output to the air pump control circuit.

13. The electric air pump control method according to claim 11, characterized in that, The inflation parameters include motor speed, and the preset inflation parameters include preset motor speed. According to the inflation parameters and the preset inflation parameters, outputting a pulse width modulation signal with a corresponding duty cycle to the air pump control circuit includes: If the motor speed is greater than the preset motor speed, reduce the duty cycle of the pulse width modulation signal output to the air pump control circuit; If the motor speed is less than the preset motor speed, increase the duty cycle of the pulse width modulation signal output to the air pump control circuit.

14. An electric air pump control device based on the electric air pump control system according to any one of claims 1-9, characterized in that, It includes: An opening control module, configured to control the electric inflator to start running if an inflation instruction for constant parameter inflation is received; An inflation parameter acquisition module, configured to acquire the inflation parameters during the operation of the electric inflator; An inflation adjustment module, configured to output a pulse width modulation signal with a corresponding duty cycle to the air pump control circuit according to the inflation parameter and a preset inflation parameter; the air pump control circuit is configured to output an inflation current to the motor pump according to the pulse width modulation signal to achieve inflation with constant parameters.

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