Volumetric pressure reducing pressure regulating device and control method for electric propulsion

Abstract

The present invention provides a volumetric pressure-reducing pressure regulating device and control method for electric propulsion, comprising a solenoid valve, a first gas container, a second gas container, a buffer gas tank, a first pressure sensor, and a second pressure sensor; the solenoid valve comprises a first-stage solenoid valve SV1, a second-stage solenoid valve SV2, and a third-stage solenoid valve SV3 connected in sequence; the first gas container is disposed between the first-stage solenoid valve SV1 and the second-stage solenoid valve SV2, the second gas container is disposed between the second-stage solenoid valve SV2 and the third-stage solenoid valve SV3, the first pressure sensor is disposed upstream of the first-stage solenoid valve SV1, and the second pressure sensor is disposed downstream of the third-stage solenoid valve SV3. The present invention utilizes three solenoid valves to improve the operational reliability of the electric propulsion system; reduces pressure by using the volume ratio between the three solenoid valves, thereby improving the accuracy and reliability of pressure regulation; and the simple structure miniaturizes the electric propulsion system, thereby reducing system mass and optimizing spatial layout.

Description

Technical Field

[0001] The present invention relates to the field of space electric propulsion, and in particular to a volumetric pressure-reducing pressure regulating device for electric propulsion and a control method thereof. Background Art

[0002] Space electric propulsion systems generally store the propulsion fluid in high-pressure gas cylinders and use a self-locking valve to isolate the propulsion fluid from the system. After the self-locking valve is opened, the propulsion fluid undergoes a first-level pressure reduction through a pressure reducing valve. Figure 3 A schematic diagram of a typical electric propulsion pressure regulator is provided. The downstream buffer gas tank's pressure is controlled through a closed-loop control method using a Bangbang valve (two solenoid valves). When the buffer tank pressure falls below the lower limit, the Bangbang valve activates to start replenishing gas. When the buffer tank pressure rises above the upper limit, the Bangbang valve deactivates, achieving pressure regulation and control of the buffer tank.

[0003] The inventors believe that existing self-locking valve, pressure-reducing valve, and bangbang valve pressure-reducing solutions result in large electric propulsion systems, unreasonable spatial layouts, inaccurate pressure regulation, and insufficient reliability. Therefore, it is necessary to provide a volumetric pressure-reducing pressure regulating device and control method for electric propulsion that miniaturizes the electric propulsion system, effectively reduces system mass, optimizes spatial layout, and provides more accurate and reliable pressure regulation. Summary of the Invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a volumetric pressure reducing pressure regulating device and a control method for electric propulsion.

[0005] According to the present invention, a volumetric pressure-reducing pressure regulating device and control method for electric propulsion are provided, comprising: a solenoid valve, a first gas capacity, a second gas capacity, a buffer gas tank, a first pressure sensor and a second pressure sensor; the solenoid valve comprises a first-stage solenoid valve SV1, a second-stage solenoid valve SV2 and a third-stage solenoid valve SV3 connected in sequence; the first gas capacity is arranged between the first-stage solenoid valve SV1 and the second-stage solenoid valve SV2, the second gas capacity is arranged between the second-stage solenoid valve SV2 and the third-stage solenoid valve SV3, the buffer gas tank is arranged downstream of the third-stage solenoid valve SV3, the first pressure sensor is arranged upstream of the first-stage solenoid valve SV1, and the second pressure sensor is arranged downstream of the third-stage solenoid valve SV3.

[0006] Preferably, the buffer gas tank is provided between the three-stage solenoid valve SV3 and the second pressure sensor.

[0007] Preferably, the buffer gas tank is arranged downstream of the second pressure sensor.

[0008] Preferably, the solenoid valves have no cavities. The first air capacitance is the cavity volume between the first-stage solenoid valve SV1 and the second-stage solenoid valve SV2, and the second air capacitance is the cavity volume between the second-stage solenoid valve SV2 and the third-stage solenoid valve SV3.

[0009] Preferably, pressure reduction is achieved by setting the volume ratio of the first air capacitance to the second air capacitance.

[0010] Preferably, both the first air capacitance and the second air capacitance include a pressure vessel form and a flow channel form.

[0011] According to a control method of a volume decompression type pressure regulating device for electric propulsion provided by the present invention, the above-mentioned volume decompression type pressure regulating device for electric propulsion is adopted, and it is characterized by including the following steps:

[0012] Define the opening duration of the third-stage solenoid valve SV3 as T open , , , open2 ,

[0016] ,

[0015] , the simultaneous opening duration of the solenoid valves SV1, SV2, and SV3 is T open2 , the pressure collected by the second pressure sensor is LP1, and the pressure collected by the first pressure sensor is HP1;

[0013] Step S1, when the electric propulsion system starts to work, set the upper limit of the buffer gas tank pressure as LPH, the lower limit of the buffer gas tank pressure as LPL, set the opening time criterion T of the third-stage solenoid valve SV3 limit , set the simultaneous opening time criterion T of the solenoid valves SV1, SV2, and SV3 limit2 , set the upper limit P of the criterion for the pressure HP1 upstream of the first-stage solenoid valve SV1 SEThigh ,, set the lower limit P of the criterion for the pressure upstream of the solenoid valve SV1 SETlow , set the simultaneous opening time criterion T of the solenoid valves SV1 and SV2 open1 , set the opening duration Tsv1open of the solenoid valve SV1, the closing duration Tsv1close of the solenoid valve SV1, the opening duration Tsv2open of the solenoid valve SV2, and the closing duration Tsv2close of the solenoid valve SV2;

[0014] Step S2, judge the pressure LP1 downstream of the third-stage solenoid valve SV3. If LPL < LP1 < LPH, return to Step S2; if LP1 ≥ LPH, enter Step S3; if LP1 ≤ LPL, enter Step S4;

[0015] Step S3, close the solenoid valves SV1, SV2, and SV3 and T open Stop timing and clear the timer, T open2 Stop timing and clear the timer, return to Step S2;

[0016] Step S4, determine whether the three-stage solenoid valve SV3 is in the open state. If the three-stage solenoid valve SV3 is in the open state, keep the solenoid valve SV3 in the open state and T open Continue timing, then enter step S5; if the three-stage solenoid valve SV3 is in the closed state, open the three-stage solenoid valve SV3 and T open Start timing, and then go to step S5;

[0017] Step S5, determine T open Is it timed out? If T open ≥T limit If true, the solenoid valves SV1, SV2, and SV3 are closed and T open Stop timing and go to step S6; if T open ≥T limit If it is false, return to step S2;

[0018] Step S6: Determine whether the electric propulsion system is in the early or middle life stage; if HP1≥P SEThigh If it is true, then the first-level solenoid valve SV1 is opened and waits for Tsv1open, the first-level solenoid valve SV1 is closed and waits for Tsv1close, the second-level solenoid valve SV2 is opened and waits for Tsv2open, the second-level solenoid valve SV2 is closed and waits for Tsv2close, and then returns to step S2; if HP1≥P SEThigh If it is false, go to step S7;

[0019] Step S7, determine whether the electric propulsion system is in the middle or late life; if HP1≤P SETlow If it is false, open the first level solenoid valve SV1 and the second level solenoid valve SV2 and wait for T open1 , then close the first-level solenoid valve SV1 and the second-level solenoid valve SV2, and then return to step S2; if HP1≤P SETlow If true, go to step S8.

[0020] Step S8: The electric propulsion system is at the end of its lifespan; if T open2 =0 is true, then the solenoid valves SV1, SV2, SV3 are turned on and T open2 Start timing; if T open2 =0 is false, then keep the solenoid valves SV1, SV2, and SV3 open and T open2 Continue timing;

[0021] Step S9: The electric propulsion system is at the end of its lifespan; if T open2 >T limit2 Is false, then return to step S2; if T open2 >T limit2 If true, the solenoid valves SV1, SV2, and SV3 are closed, and Topen2 Stop timing and reset to zero, and return to the "propulsion fluid exhausted" status word.

[0022] Preferably, the opening time T of the three-stage solenoid valve SV3 is open Whether the timeout occurs determines whether the pressures of the second gas volume and the buffer gas tank are balanced.

[0023] Preferably, the electric propulsion system is in a falling pressure working mode, and the pressure HP1 upstream of the first-stage solenoid valve SV1 at the beginning of the life of the electric propulsion system is higher than that at the end of the life;

[0024] At the early stage of the life of the electric propulsion system, the first-level solenoid valve SV1 is opened in sequence to wait for Tsv1open, the first-level solenoid valve SV1 is closed to wait for Tsv1close, the second-level solenoid valve SV2 is opened to wait for Tsv2open, and the second-level solenoid valve SV2 is closed to wait for Tsv2close;

[0025] In the middle of the life of the electric propulsion system, the first-stage solenoid valve SV1 and the second-stage solenoid valve SV2 are opened and wait for T open1 , then close the first-level solenoid valve SV1 and the second-level solenoid valve SV2;

[0026] At the end of the life of the electric propulsion system, the first-stage solenoid valve SV1, the second-stage solenoid valve SV2, and the third-stage solenoid valve SV3 are opened, and T open2 Start timing.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention adopts three solenoid valves and the three serve as backup for each other. If one of the solenoid valves fails to close at the end of the system life, the other two solenoid valves can still perform pressure regulation, which helps to improve the operating reliability of the electric propulsion system. Pressure reduction is achieved by using the volume ratio between the three solenoid valves, which helps to improve the accuracy and reliability of pressure regulation. The simple structure makes the electric propulsion system miniaturized, helps to reduce the system mass, and helps to optimize the spatial layout.

[0029] 2. The present invention can realize the differential control mode of the first-level solenoid valve SV1, the second-level solenoid valve SV2 and the third-level solenoid valve SV3, the linkage control mode of the first-level solenoid valve SV1, the second-level solenoid valve SV2 and the third-level solenoid valve SV3, and the same-on and -off control mode strategy switching of the first-level solenoid valve SV1, the second-level solenoid valve SV2 and the third-level solenoid valve SV3 through precise control methods. This mode can effectively reduce the number of solenoid valve actions and help extend the service life of the system.

[0030] 3. The present invention determines whether the pressures in the second gas volume and the buffer gas tank are balanced by checking whether the opening time of the third-stage solenoid valve SV3 has timed out. The third-stage solenoid valve SV3 replaces the pressure sensor between the second-stage solenoid valve SV2 and the third-stage solenoid valve SV3. The control strategy optimizes the system configuration, miniaturizing the electric propulsion system and helping to optimize the spatial layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0032] Figure 1 This is a schematic diagram of a volumetric pressure-reducing pressure regulating device for electric propulsion, which is mainly embodied in the present invention;

[0033] Figure 2 This is a control flow chart of a volumetric pressure reducing pressure regulating device for electric propulsion, which is mainly embodied in the present invention;

[0034] Figure 3 The present invention mainly embodies the principle diagram of a BANGBANG valve pressure regulating device for a typical space electric propulsion xenon gas storage and supply system in the prior art.

[0035] As shown in the figure:

[0036] Solenoid valve 1 First gas container 2 Second gas container 3

[0037] Buffer gas tank 4 First pressure sensor 5 Second pressure sensor 6 DETAILED DESCRIPTION

[0038] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0039] Example 1

[0040] like Figure 1As shown, a volumetric pressure-reducing pressure regulating device and control method for electric propulsion according to the present invention includes: a solenoid valve 1, a first gas container 2, a second gas container 3, a buffer gas tank 4, a first pressure sensor 5, and a second pressure sensor 6. The solenoid valve 1 includes a first-stage solenoid valve SV1, a second-stage solenoid valve SV2, and a third-stage solenoid valve SV3 connected in sequence. The first gas container 2 is arranged between the first-stage solenoid valve SV1 and the second-stage solenoid valve SV2, the second gas container 3 is arranged between the second-stage solenoid valve SV2 and the third-stage solenoid valve SV3, the buffer gas tank 4 is arranged downstream of the third-stage solenoid valve SV3, the first pressure sensor 5 is arranged upstream of the first-stage solenoid valve SV1, and the second pressure sensor 6 is arranged downstream of the third-stage solenoid valve SV3. The buffer gas tank 4 is arranged between the third-stage solenoid valve SV3 and the second pressure sensor 6.

[0041] The three solenoid valves 1 serve as backups for each other. If a valve fails to close at the end of the system's life, the other two solenoid valves can provide pressure regulation, improving the reliability of the electric propulsion system. This application abandons the traditional one-stage pressure reduction scheme of a self-locking valve in series with a pressure reducing valve, and uses a three-stage solenoid valve pressure reduction scheme instead of the original self-locking valve, pressure reducing valve, and bangbang valve pressure reduction scheme. This can miniaturize the electric propulsion system, effectively reduce system mass, and optimize spatial layout.

[0042] A first pressure sensor 5 upstream of the first-stage solenoid valve SV1 monitors the pressure HP1 upstream of the first-stage solenoid valve SV1. This allows for switching strategies between differential control of the first-stage, second-stage, and third-stage solenoid valves SV1, SV2, and SV3, coordinated control of the first-stage, second-stage, and third-stage solenoid valves SV1, SV2, and SV3, and simultaneous on / off control of the first-stage, second-stage, and third-stage solenoid valves SV1, SV2, and SV3. A second pressure sensor 6 downstream of the third-stage solenoid valve SV3 monitors the downstream pressure, controlling the on / off timing of the third-stage solenoid valve 1 in a closed-loop manner to achieve stable pressure control of the buffer gas tank 4.

[0043] Assuming that neither solenoid valve 1 has a cavity, the first gas volume 2 is the volume of the cavity between the first-stage solenoid valve SV1 and the second-stage solenoid valve SV2, and the second gas volume 3 is the volume of the cavity between the second-stage solenoid valve SV2 and the third-stage solenoid valve SV3. This device achieves pressure reduction by designing the volume ratio of the first gas volume 2 to the second gas volume 3. The first gas volume 2 and the second gas volume 3 are not limited to the form of pressure vessels, but can also be the form of equal-volume flow channels, or any form that achieves the volume ratio of gas volume 2 to gas volume 3. Utilizing the volume ratio between the solenoid valves 1 to reduce pressure makes pressure regulation more precise and reliable compared to pressure reducing valves that use springs and diaphragms to adaptively adjust and output a stable pressure.

[0044] Assume that the upstream volume of the first-level solenoid valve SV1 is V1 and the gas pressure is P1. Set the volume of the first gas volume 2 to V2 and the volume of the second gas volume 3 to V3. Assume that the upstream pressure of the first-level solenoid valve SV1 is P1, the first-level solenoid valve SV1 is opened for a period of t1, and the first-level solenoid valve SV1 is closed, and the pressure between the first-level solenoid valve SV1 and the second-level solenoid valve SV2 is P2. The second-level solenoid valve SV2 is opened for a period of t1, and the second-level solenoid valve SV2 is closed, and the pressure between the first-level solenoid valve SV2 and the second-level solenoid valve SV3 is P3. V1 is much greater than V2, so it can be approximately considered that P1=P2. Assuming that the gas in the device is an ideal gas and the temperature of each component is the same, then P2V2=P3V3, and it can be deduced that The volume ratio between the first and second gas volumes 2 and 3 reduces the pressure P3 between the first and second solenoid valves SV2 and SV3 to a lower pressure. The third solenoid valve SV3 is then opened, and the second pressure sensor 6 determines whether the pressure has reached the target value. If so, a feedback signal is sent to close the third solenoid valve SV3.

[0045] Variations

[0046] Based on Example 1, the buffer gas tank 4 may also be arranged downstream of the second pressure sensor 6 .

[0047] Example 2

[0048] like Figure 2 As shown, a control method of a volumetric pressure-reducing device for electric propulsion according to the present invention, using the volumetric pressure-reducing device for electric propulsion described in Example 1, includes the following steps:

[0049] Define the opening time of the three-stage solenoid valve SV3 as T open The solenoid valves SV1, SV2 and SV3 are opened simultaneously for a time period of T open2 , the second pressure sensor 6 collects a pressure of LP1, and the first pressure sensor 5 collects a pressure of HP1;

[0050] Step S1: When the electric propulsion system starts working, the upper limit of the pressure of the buffer gas tank 4 is set to LPH, the lower limit of the pressure of the buffer gas tank 4 is set to LPL, and the opening time criterion T of the three-stage solenoid valve SV3 is set. limit , set the electromagnetic valve SV1, SV2, SV3 simultaneous opening time criterion T limit2 , set the upper limit P of the upstream pressure HP1 of the first-level solenoid valve SV1 SEThigh, , set the lower limit P of the upstream pressure criterion of the solenoid valve SV1 SETlow , set the solenoid valve SV1, SV2 simultaneous opening time criterion T open1, set the opening duration Tsv1open of the solenoid valve SV1, the closing duration Tsv1close of the solenoid valve SV1, set the opening duration Tsv2open of the solenoid valve SV2, and the closing duration Tsv2close of the solenoid valve SV2;

[0051] Step S2, judge the downstream pressure LP1 of the three-stage solenoid valve SV3. If LPL < LP1 < LPH, return to step S2; if LP1 ≥ LPH, enter step S3; if LP1 ≤ LPL, enter step S4;

[0052] Step S3, close the solenoid valves SV1, SV2, and SV3 and T open Stop timing and clear the timer, T open2 Stop timing and clear the timer, return to step S2;

[0053] Step S4, judge whether the three-stage solenoid valve SV3 is in the open state. If the three-stage solenoid valve SV3 is in the open state, keep the solenoid valve SV3 in the open state and T open Continue to time, and then enter step S5; if the three-stage solenoid valve SV3 is in the closed state, open the three-stage solenoid valve SV3 and T open Start timing, and then enter step S5;

[0054] Step S5, judge whether T open is overtime; if T open ≥ T limit is true, close the solenoid valves SV1, SV2, and SV3 and T open Stop timing, and then enter step S6; if T open ≥ T limit is false, return to step S2;

[0055] Step S6, judge whether the electric propulsion system is in the initial stage or the middle and late stages of its life; if HP1 ≥ P SEThigh is true, sequentially open the first-stage solenoid valve SV1 and wait for Tsv1open, close the first-stage solenoid valve SV1 and wait for Tsv1close, open the second-stage solenoid valve SV2 and wait for Tsv2open, close the second-stage solenoid valve SV2 and wait for Tsv2close, and then return to step S2; if HP1 ≥ P SEThigh is false, enter step S7;

[0056] Step S7, judge whether the electric propulsion system is in the middle stage or the late stage of its life; if HP1 ≤ P SETlow is false, open the first-stage solenoid valve SV1 and the second-stage solenoid valve SV2 and wait for T open1 , and then close the first-stage solenoid valve SV1 and the second-stage solenoid valve SV2, and then return to step S2; if HP1 ≤ PSETlow If true, go to step S8.

[0057] Step S8: The electric propulsion system is at the end of its lifespan; if T open2 =0 is true, then the solenoid valves SV1, SV2, SV3 are turned on and T open2 Start timing; if T open2 =0 is false, then keep the solenoid valves SV1, SV2, and SV3 open and T open2 Continue counting;

[0058] Step S9: The electric propulsion system is at the end of its lifespan; if T open2 >T limit2 Is false, then return to step S2; if T open2 >T limit2 If true, the solenoid valves SV1, SV2, and SV3 are closed, and T open2 Stop timing and reset to zero, and return to the "propulsion fluid exhausted" status word.

[0059] Through the three-stage solenoid valve SV3 opening time T open Whether the timeout is reached determines whether the pressures of the second gas container 3 and the buffer gas tank 4 are balanced. It replaces the pressure sensor between the secondary solenoid valve SV2 and the tertiary solenoid valve SV3, and optimizes the system configuration through the control strategy.

[0060] The electric propulsion system is in a pressure drop working mode. The control method of the present application can realize the differential control mode of the first-level solenoid valve SV1, the second-level solenoid valve SV2 and the third-level solenoid valve SV3, the linkage control mode of the first-level solenoid valve SV1, the second-level solenoid valve SV2 and the third-level solenoid valve SV3, and the same-on and same-off control mode strategy switching of the first-level solenoid valve SV1, the second-level solenoid valve SV2 and the third-level solenoid valve SV3.

[0061] Early in the life of the electric propulsion system, the pressure HP1 upstream of the first-stage solenoid valve SV1 is high. This leads to the selection of a differential control mode for the first-stage and second-stage solenoid valves SV1 and SV2. This mode sequentially opens and closes the first-stage and second-stage solenoid valves SV1 and SV2, respectively. This mode achieves pressure reduction by designing the volume ratio of the first and second air volumes 2 and 3, keeping the pressure between the second and third-stage solenoid valves SV2 and SV3 at a low level. The third-stage solenoid valve SV3 is then opened, and the second pressure sensor 6 determines whether the pressure has reached the target value. If so, a feedback signal is sent to close the third-stage solenoid valve SV3.

[0062] In the middle of the life of the electric propulsion system, the first-stage solenoid valve SV1 and the second-stage solenoid valve SV2 are opened simultaneously and wait for T open1 , and then close the first-level solenoid valve SV1 and the second-level solenoid valve SV2 at the same time; this mode is achieved by designing the solenoid valves SV1 and SV2 to be open for a period of time Tset This reduces pressure, keeping the pressure between the secondary solenoid valve SV2 and the tertiary solenoid valve SV3 at an appropriate level. The tertiary solenoid valve SV3 is then opened, and the second pressure sensor 6 determines whether the pressure has reached the target value. If so, a feedback signal is sent to close the tertiary solenoid valve SV3.

[0063] At the end of the electric propulsion system's lifespan, the pressure HP1 upstream of the first-stage solenoid valve SV1 decreases. A simultaneous on / off control mode is selected for the first, second, and third-stage solenoid valves SV1, SV2, and SV3. This mode activates the first, second, and third-stage solenoid valves SV1, SV2, and SV3, and uses the second pressure sensor 6 to determine whether the pressure has reached the target value. If so, a feedback signal is sent to close the first, second, and third-stage solenoid valves SV1, SV2, and SV3. This mode effectively reduces the number of solenoid valve actuations and extends the system's lifespan.

[0064] This application realizes pressure control by designing the volume ratio between the solenoid valves 1, and adjusts the pressure of the downstream buffer gas tank 4 through closed-loop control of the pressure sensor. The control method includes the opening sequence of the first-level solenoid valve SV1, the second-level solenoid valve SV2, and the third-level solenoid valve SV3. The opening time T of the third-level solenoid valve SV3 is 1 / 2. open A timeout strategy and the use of a second pressure sensor 6 to collect pressure LP1 as a closed-loop feedback parameter enable pressure control in the electric propulsion system's buffer gas tank 4. This application is particularly suitable for space electric propulsion systems with high quality and structural size requirements. It can miniaturize the electric propulsion system, effectively reducing system mass and optimizing spatial layout. By utilizing the volume ratio between the solenoid valves 1 to reduce pressure, pressure regulation is more precise and reliable. The three solenoid valves 1 serve as backup for each other, improving the reliability of the electric propulsion system.

[0065] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0066] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A control method for a volumetric pressure-reducing pressure regulating device for electric propulsion, using a volumetric pressure-reducing pressure regulating device for electric propulsion, characterized in that: It includes the following steps: Define the opening time of the three-stage solenoid valve SV3 as T open , the solenoid valves SV1, SV2, and SV3 are opened simultaneously for a time period of T open2 , the second pressure sensor (6) collects a pressure of LP1, and the first pressure sensor (5) collects a pressure of HP1; Step S1, when the electric propulsion system starts working, the upper limit of the pressure of the buffer gas tank (4) is set to LPH, the lower limit of the pressure of the buffer gas tank (4) is set to LPL, and the opening time criterion T of the three-stage electromagnetic valve SV3 is set. limit , set the electromagnetic valve SV1, SV2, SV3 simultaneous opening time criterion T limit2 , set the upper limit P of the upstream pressure HP1 of the first-stage solenoid valve SV1 SEThigh , set the lower limit P of the upstream pressure criterion of the solenoid valve SV1 SETlow , set the solenoid valve SV1, SV2 simultaneous opening time criterion T open1 , set the solenoid valve SV1 opening time Tsv1open, the solenoid valve SV1 closing time Tsv1close, set the solenoid valve SV2 opening time Tsv2open, the solenoid valve SV2 closing time Tsv2close; Step S2: Judge the downstream pressure LP1 of the three-stage solenoid valve SV3. If LPL < LP1 < LPH, return to Step S2; if LP1 ≥ LPH, enter Step S3; if LP1 ≤ LPL, enter Step S4; Step S3, close the solenoid valves SV1, SV2, and SV3 and open Stop timing and reset the timer, T open2 Stop timing and reset the timer to zero, and return to step S2; Step S4, determine whether the three-stage solenoid valve SV3 is in the open state. If the three-stage solenoid valve SV3 is in the open state, keep the solenoid valve SV3 in the open state and T open Continue timing, then enter step S5; if the three-stage solenoid valve SV3 is in the closed state, open the three-stage solenoid valve SV3 and T open Start timing, and then go to step S5; Step S5, determine T open Is it timed out? If T open ≥T limit If true, the solenoid valves SV1, SV2, and SV3 are closed and T open Stop timing and go to step S6; if T open ≥T limit If it is false, return to step S2; Step S6: Determine whether the electric propulsion system is in the early or middle life stage; if HP1≥P SEThigh If it is true, then the first-level solenoid valve SV1 is opened and waits for Tsv1open, the first-level solenoid valve SV1 is closed and waits for Tsv1close, the second-level solenoid valve SV2 is opened and waits for Tsv2open, the second-level solenoid valve SV2 is closed and waits for Tsv2close, and then returns to step S2; if HP1≥P SEThigh If it is false, go to step S7; Step S7, determine whether the electric propulsion system is in the middle or late life; if HP1≤P SETlow If it is false, open the first level solenoid valve SV1 and the second level solenoid valve SV2 and wait for T open1 , then close the first-level solenoid valve SV1 and the second-level solenoid valve SV2, and then return to step S2; if HP1≤P SETlow If true, go to step S8; Step S8: The electric propulsion system is at the end of its lifespan; if T open2 =0 is true, then the solenoid valves SV1, SV2, SV3 are turned on and T open2 Start timing; if T open2 =0 is false, then keep the solenoid valves SV1, SV2, and SV3 open and T open2 Continue timing; Step S9: The electric propulsion system is at the end of its lifespan; if T open2 >T limit2 Is false, then return to step S2; if T open2 >T limit2 If true, the solenoid valves SV1, SV2, and SV3 are closed, and T open2 Stop timing and reset to zero, and return to the "propulsion fluid exhausted" status word; The volume-reducing pressure regulating device for electric propulsion includes: a solenoid valve (1), a first air capacitor (2), a second air capacitor (3), a buffer air tank (4), a first pressure sensor (5), and a second pressure sensor (6); The solenoid valve (1) includes a first-stage solenoid valve SV1, a second-stage solenoid valve SV2, and a third-stage solenoid valve SV3 connected in sequence; The first air capacitor (2) is arranged between the first-stage solenoid valve SV1 and the second-stage solenoid valve SV2, the second air capacitor (3) is arranged between the second-stage solenoid valve SV2 and the third-stage solenoid valve SV3, the buffer air tank (4) is arranged downstream of the third-stage solenoid valve SV3, the first pressure sensor (5) is arranged upstream of the first-stage solenoid valve SV1, and the second pressure sensor (6) is arranged downstream of the third-stage solenoid valve SV3.

2. The control method of the electric propulsion volume reduction pressure regulating device according to claim 1, characterized in that: The three-stage solenoid valve SV3 is opened for a time T open Whether the timeout occurs is used to determine whether the pressures of the second gas container (3) and the buffer gas tank (4) are balanced.

3. The control method of the electric propulsion volume reduction pressure regulating device according to claim 1, characterized in that: The electric propulsion system is in a falling pressure working mode, and the pressure HP1 upstream of the first-stage solenoid valve SV1 in the initial stage of the life of the electric propulsion system is higher than that in the end stage of the life; In the initial stage of the life of the electric propulsion system, the first-stage solenoid valve SV1 is opened in sequence and waits for Tsv1open, the first-stage solenoid valve SV1 is closed and waits for Tsv1close, the second-stage solenoid valve SV2 is opened and waits for Tsv2open, and the second-stage solenoid valve SV2 is closed and waits for Tsv2close; In the middle of the life of the electric propulsion system, the first-stage solenoid valve SV1 and the second-stage solenoid valve SV2 are opened and wait for T open1 , then close the first-level solenoid valve SV1 and the second-level solenoid valve SV2; At the end of the life of the electric propulsion system, the first-stage solenoid valve SV1, the second-stage solenoid valve SV2, and the third-stage solenoid valve SV3 are opened, and T open2 Start timing.

4. The control method of the electric propulsion volume reduction pressure regulating device according to claim 1, characterized in that: The buffer air tank (4) is arranged between the third-stage solenoid valve SV3 and the second pressure sensor (6).

5. The control method of the electric propulsion volume reduction pressure regulating device according to claim 1, characterized in that: The buffer air tank (4) is arranged downstream of the second pressure sensor (6).

6. The control method of the electric propulsion volume reduction pressure regulating device according to claim 1, characterized in that: None of the solenoid valves (1) has a cavity. The first air capacitor (2) is the volume of the cavity between the first-stage solenoid valve SV1 and the second-stage solenoid valve SV2, and the second air capacitor (3) is the volume of the cavity between the second-stage solenoid valve SV2 and the third-stage solenoid valve SV3.

7. The control method of the electric propulsion volume reduction pressure regulating device according to claim 1, characterized in that: The pressure reduction is achieved by setting the volume ratio of the first air capacitor (2) and the second air capacitor (3).

8. The control method of the electric propulsion volume reduction pressure regulating device according to claim 1, characterized in that: Both the first air capacitor (2) and the second air capacitor (3) include a pressure vessel form and a flow channel form.

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