High-start low-maintenance electromagnetic valve control system

Abstract

The invention discloses a high-start low-maintenance electromagnetic valve control system which is characterized in that an upper computer outputs a control signal to a high-start low-maintenance control box, the high-start low-maintenance control box outputs to open electromagnetic valves, and three paths of identical control systems are arranged in the high-start low-maintenance control box and can control three groups of electromagnetic valves to act; the control system comprises a bipolar power supply, a Hall sensor, a solid-state relay, an aviation plug, a release loop, a slide rail connector bar and a diode; the bipolar power supply supplies power to the Hall sensor, high and low voltage anodes are connected with output anodes of the two solid-state relays through the sliding rail connector bar, output cathodes of the solid-state relays are connected with anodes of the diodes, and cathodes of the diodes are connected to input anodes of the Hall sensor. According to the invention, the working efficiency and the control precision of the electromagnetic valve in the hot test run test process are improved, and the release loop is connected in parallel to the output of the electromagnetic valve and the input positive electrode of the Hall sensor.

Description

Technical Field

[0001] The invention relates to the technical field of solenoid valves for liquid attitude control rocket engines, and in particular to a high-startup and low-maintenance solenoid valve control system. Background Art

[0002] During the operation, the liquid attitude control rocket engine controls the propellant flow rate by controlling the on and off of the solenoid valve to control the thrust of the engine. In the hot test, the host computer compiles the timing and sends it to the acquisition card. The acquisition card DO channel controls the on and off of the solenoid valve according to the timing output voltage. Therefore, the success of a hot test is closely related to the solenoid valve. The performance of the solenoid valve depends not only on the product structure of the solenoid valve itself, but also on the strategy of controlling the solenoid valve. The current mainstream strategy for controlling solenoid valves is generally to provide a start voltage to the solenoid valve to turn it on and turn it on, and to close it after the power supply is stopped. In this control strategy, if the start voltage is high, although the opening speed of the solenoid valve can be increased, the excessive voltage may cause damage to the solenoid valve coil, and the closing speed of the solenoid valve will also be reduced. If the start voltage is low, the solenoid valve may be opened for too long or even cannot be fully opened. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a high-startup and low-maintenance solenoid valve control system, which improves the working efficiency and control accuracy of the solenoid valve during the hot run test.

[0004] The technical solution adopted by the present invention is a high-start and low-maintenance solenoid valve control system, comprising a high-start and low-maintenance control box, a host computer, and a solenoid valve; the host computer outputs a control signal to the high-start and low-maintenance control box, and the high-start and low-maintenance control box outputs a voltage to open the solenoid valve. There are three identical control systems in the high-start and low-maintenance control box, which can control the actions of three groups of solenoid valves. The control system includes a bipolar power supply, a Hall sensor, a solid-state relay, an aviation plug, a release circuit, a slide rail wiring block, and a diode; the bipolar power supply supplies power to the Hall sensor, the external high and low voltage positive electrodes are connected to the two solid-state relay output positive electrodes through the slide rail wiring block, the solid-state relay output negative electrode is connected to the diode positive electrode, the diode negative electrode is connected to the Hall sensor input positive electrode, the Hall sensor input negative electrode is connected to the external solenoid valve through the aviation plug, and returns to the negative electrode of the high and low power supply after passing through the solenoid valve. The release circuit is connected in parallel to the solenoid valve output and the Hall sensor input positive terminal, and the DO channel on the front panel of the control box is connected to the output channel of the acquisition card and the solid-state relay control end in the box.

[0005] Preferably, the control circuit adopted by the control system is: the control signals DO0 and DO1 output by the host computer control the two relays SSR1 and SSR2 to be energized respectively, and the relay SSR1 is connected to the high voltage power supply and the output of SSR2 is connected to the low voltage power supply. The high and low voltage power supplies are output to the solenoid valve LW1 after passing through the relay and the Hall sensor, and return to the negative pole of the power supply.

[0006] Preferably, the output ends of the two relays SSR1 and SSR2 are respectively connected to diodes D1 and D2 for preventing current backflow, and a release circuit is connected in parallel in the solenoid valve circuit, and the release circuit is a series circuit of a diode D3 and a 51Ω resistor.

[0007] The beneficial effects of the present invention are as follows: the solenoid valve control system of a liquid attitude control rocket engine can automatically switch the power supply voltage during the operation of the engine solenoid valve, and the voltage is stable during the switching process. Since high voltage is used for starting, the opening speed of the solenoid valve is accelerated, and since low voltage is used in the maintenance stage, the shutdown time required for the current in the solenoid valve to decrease from the maintenance current to 0 is reduced; a release loop is added during the opening and closing process of the solenoid valve to make the characteristic points of the current curve obvious; an anti-reverse diode is added to avoid the current backflow phenomenon caused by inconsistent levels in the switching voltage; and the control box can save the energy consumed by the solenoid valve because it adopts a high-start and low-maintenance control strategy. The invention significantly improves the working efficiency and control accuracy of the solenoid valve during the hot test. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is the test schematic diagram.

[0009] Figure 2 This is the circuit schematic.

[0010] Figure 3 This is the front panel dimension drawing.

[0011] Figure 4 This is the rear panel dimension drawing.

[0012] Figure 5 This is a diagram of the components inside the control box.

[0013] Markings in the figure: 1. Bipolar power supply, 2. Hall sensor, 3. Solid-state relay, 4. Aviation plug, 5. Release circuit, 6. Slide rail terminal block, 7. Diode. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0015] The high-start and low-maintenance solenoid valve control system is composed of a solid-state relay 3, a Hall sensor 2, a release circuit 5, a diode 7, a bipolar power supply 1, a housing and other accessories.

[0016] There are three identical control systems in the control box, which can control three solenoid valves. Take one of them as an example. The bipolar power supply 1 supplies power to the Hall sensor 2. The external high and low voltage positive poles are connected to the positive output poles of the two solid-state relays 3 through the rail terminal block 6. The negative pole of the relay output is connected to the positive pole of the diode 7. The negative pole of the diode 7 is connected to the positive input pole of the Hall sensor 2. The negative input pole of the Hall sensor 2 is connected to the external solenoid valve through the aviation plug 4. After passing through the solenoid valve, it returns to the negative pole of the high and low power supply to form a loop. At the same time, the release loop 5 is connected in parallel to the solenoid valve output and the positive input terminal of the Hall sensor 2. The accumulated electricity after the solenoid valve is closed is released through the release loop 5. The DO channel on the front panel is connected to the output channel of the acquisition card and the control end of the solid-state relay 3 in the box. In this way, the acquisition card can control whether the two solid-state relays in the box are working, thereby controlling whether the voltage output to the solenoid valve is high voltage or low voltage.

[0017] The control signals DO0 and DO1 output by the host computer control the two relays SSR1 and SSR2 to be energized respectively. The outputs of the two relays are connected to the high and low voltage power supplies respectively. The high and low voltages are output to the solenoid valve LW1 after passing through the relay and the Hall sensor 2, and return to the negative pole of the power supply to form a loop. Diodes D1 and D2 must be connected to the output end of the relay to prevent current backflow, and a release loop 5 (composed of a diode D3 and a 51Ω resistor) should be connected in parallel in the solenoid valve loop to release the holding current in the solenoid valve coil.

[0018] The operator writes the timing on the host computer, which includes the solenoid valve power-on time, power-off time, number of cycles, and the time occupied by high voltage and low voltage in one power-on time. After the timing is written, the host computer clicks to trigger the timing, and the acquisition card will output a control signal according to the timing. The signal will control the high-start and low-maintenance solenoid valve control system to output voltage to the solenoid valve.

[0019] 1. Bipolar power supply Model: 4NIC-X15 Input: AC220V±10% Frequency: 50Hz Output: ±15VDC 0.5A 2. Hall sensor: Power supply: ±15VDC Rated input current: 0-5ADC Rated output voltage: 0-5VDC Accuracy level: 0.8%FS Operating temperature range: -40℃ to 85℃ 3. Solid-state relay Input voltage: 4-32VDC Maximum input current: 22mA Output voltage: 4-60VDC Maximum output current: 3A Operating temperature range: -30℃ to 80℃ 4. Aviation plug Rated current: 10A Rated voltage: 500VAC Operating temperature range: -40℃ to 85℃ 5. Release loop Release loop diode model: 1N5822 Release loop resistance: 51Ω Release loop resistance power: 1W 6. Slide rail terminal block Rated voltage: 800V Rated current: 32A 7. Diode Applicable model: 1N5822 Reverse breakdown voltage: 40V Reverse breakdown current: 3A Forward voltage: 0.525V Operating temperature range: -65℃ to 125℃ Wire gauge: 0.2-2.5mm2 Solenoid valve high start and low maintenance test. Opening time Off time 24V switch 6.2ms 15.2ms 28V on, 14V on 5.5ms 9ms

[0020] At the beginning of the test, the control signal output by the host computer makes the high-start and low-maintenance control box output a high voltage of 28V, and the output voltage opens the solenoid valve. When the solenoid valve is fully opened, the host computer outputs a signal to make the high-start and low-maintenance control box output a maintenance voltage of 14V. After the voltage across the solenoid valve is switched to 14V, the current flowing through the solenoid valve decreases. Then the host computer outputs a stop signal, and the control box stops supplying power to the solenoid valve. The follow-flow current of the solenoid valve flows through the release circuit of the control box until it is reduced to zero. The Hall sensor 2 in the control box can convert the current signal in the solenoid valve circuit into a voltage signal and output it to the acquisition card. The test was conducted twice in total. The first time was not to perform high start and low maintenance operation, but to control the voltage at both ends of the solenoid valve to 24V, and then measure the time when the solenoid valve is fully opened and the time when it is fully closed. The second time was to perform high start and low maintenance operation, and then measure the opening time and closing time of the solenoid valve. The two measurement results are shown in the table above. It can be seen from the table that the opening speed of the solenoid valve with a 28V opening voltage is significantly faster than the opening speed of the solenoid valve with a 24V opening voltage, and the closing speed of the solenoid valve with a 14V closing voltage is also faster than the closing speed of the solenoid valve with a 24V closing voltage. The present invention improves the response speed of the solenoid valve during the hot test, highlights the characteristic points of the solenoid valve current curve, and avoids the current backflow phenomenon caused by the inconsistent levels of high and low voltages.

[0021] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high start and low maintenance solenoid valve control system, characterized in that: The invention comprises a high start and low maintenance control box, a host computer and a solenoid valve; the host computer outputs a control signal to the high start and low maintenance control box, and the high start and low maintenance control box outputs a voltage to open the solenoid valve; the high start and low maintenance control box has three identical control systems, which can control the actions of three groups of solenoid valves; the control system comprises a bipolar power supply (1), a Hall sensor (2), a solid-state relay (3), an aviation plug (4), a release circuit (5), a slide rail terminal block (6) and a diode (7); the bipolar power supply (1) supplies power to the Hall sensor (2); the external high and low voltage positive electrodes are connected to the output positive electrodes of the two solid-state relays (3) through the slide rail terminal block (6); the output negative electrode of the solid-state relay (3) is connected to the positive electrode of the diode (7); the negative electrode of the diode (7) is connected to the input positive electrode of the Hall sensor (2); the input negative electrode of the Hall sensor (2) is connected to the external solenoid valve through the aviation plug (4); After passing through the solenoid valve, it returns to the negative pole of the high and low power supply, and the release loop (5) is connected in parallel to the solenoid valve output and the positive input terminal of the Hall sensor (2). The DO channel on the front panel of the control box is connected to the output channel of the acquisition card and the control terminal of the solid-state relay (3) in the box.

2. A high start and low maintenance solenoid valve control system according to claim 1, characterized in that: The control circuit adopted by the control system is as follows: the control signals DO0 and DO1 output by the host computer control the two relays SSR1 and SSR2 to be energized respectively, and the relay SSR1 is connected to the high voltage power supply and the output of SSR2 is connected to the low voltage power supply. The high and low voltage power supplies are output to the solenoid valve LW1 after passing through the relay and the Hall sensor (2), and then return to the negative pole of the power supply.

3. A high start and low maintenance solenoid valve control system according to claim 1, characterized in that: The output ends of the two relays SSR1 and SSR2 are respectively connected to diodes D1 and D2 for preventing current backflow, and a release circuit is connected in parallel in the solenoid valve circuit. The release circuit is a series circuit of a diode D3 and a 51Ω resistor.

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