Helicopter windshield washing control circuit and control method

Abstract

The invention belongs to the technical field of system electrical control, and relates to a helicopter windshield glass flushing control circuit and method, and the circuit comprises a circuit breaker, a control button, a left flushing pump, a right flushing pump, a delay release relay, a delay 1s pull-in relay, a delay 0.25 s pull-in relay, and a control relay. The control mode is that the control button directly controls power-on and power-off of the circuit, and the control button controls the time-delay release relay, and then the time-delay release relay controls power-on and power-off of the circuit. The control button is still installed on a switch board of a cab ceiling and is of a self-reset type, the operation mode is changed from long-time pressing to short-time pressing and then loosening, and the flushing control circuit can be continuously powered on through delayed release of the delayed release relay; the circuit controls the flushing pump to periodically and intermittently work through alternate work of the two delay pull-in relays, the spraying amount of flushing fluid is effectively controlled, and the situation that a pilot presses a control button all the time, and the flushing fluid is excessively consumed is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of system electrical control and relates to a helicopter windshield washing control circuit and a control method. Background Art

[0002] During the flight of a helicopter, dirt, dust, insect residues, etc. will adhere to the windshield, making the pilot's vision unclear. The windshield washing control system sprays the washing liquid onto the windshield to wash the windshield. At the same time, the windshield wipers scrape the windshield to effectively remove pollutants on the glass, ensuring that the pilot has a clear vision and improving flight safety.

[0003] The existing windshield washing control system is to keep pressing the washing pump control button to make the washing pump work, and the washing liquid in the pump is sprayed onto the windshield through the nozzle to achieve the purpose of cleaning the windshield. Once the control button is released, the washing pump stops working immediately. The washing pump control button is installed on the switch panel on the cockpit ceiling. The disadvantage is that if the pilot needs to wash the windshield during flight, he needs to keep raising his arm to press the button continuously, and also start the windshield wiper. The two actions are performed simultaneously, which increases the operating burden of the pilot. Summary of the invention

[0004] Technical problem solved by the present invention: The present invention proposes a helicopter windshield washing control circuit and control method to solve the problem of controlling the windshield spraying by continuously pressing the washing pump control button in the prior art. The circuit structure of the present invention includes a delayed release relay, two delayed pull-in relays, a control relay and two washing pumps. The control mode is that the control button directly controls the power on and off of the circuit, and is designed to control the delayed release relay by the control button, and then the delayed release relay controls the power on and off of the circuit. The control button is still installed on the switch board on the ceiling of the cockpit, and is a self-reset type. The operation mode is changed from long-term pressing to short-term pressing and then releasing. The washing control circuit can be continuously energized by the delayed release of the delayed release relay. The circuit controls the periodic intermittent operation of the washing pump through the alternating operation of the two delayed pull-in relays, which can effectively control the spraying amount of the washing liquid and avoid the pilot from pressing the control button all the time and over-consuming the washing liquid.

[0005] Technical solution of the present invention

[0006] A helicopter windshield washing control circuit comprises a circuit breaker, a control button, a left washing pump, a right washing pump, a delayed release relay, a 1s delayed pick-up relay, a 0.25s delayed pick-up relay and a control relay. The circuit breaker is connected to one contact of the control button, the other contact of the control button is connected to the positive end of the delayed release relay coil, and the negative end of the delayed release relay coil is connected to a power supply ground; the common contact of the delayed release relay is connected to the circuit breaker, the normally open contact of the delayed release relay is respectively connected to the positive end of the 1s delayed pick-up relay coil and the common contact of the 1s delayed pick-up relay, and the negative end of the 1s delayed pick-up relay coil is connected to the power supply ground through the 0.25s delayed pick-up relay. The common contact and normally closed contact are connected to the power ground, the normally open contact of the 1s delay pick-up relay is connected to the positive end of the 0.25s delay pick-up relay coil, and the negative end of the 0.25s delay relay coil is connected to the power ground, the normally closed contact of the 1s delay pick-up relay is connected to the positive end of the control relay coil, and the negative end of the control relay coil is connected to the power ground, the common contact of the first pair of contacts of the control relay is connected to the circuit breaker, the normally open contact of the first pair of contacts is connected to the positive end of the left flushing pump, and the negative end of the left flushing pump is connected to the power ground, the common contact of the second pair of contacts of the control relay is connected to the circuit breaker, the normally open contact of the second pair of contacts is connected to the positive end of the right flushing pump, and the negative end of the right flushing pump is connected to the power ground.

[0007] Furthermore, the delayed release relay is a normally closed relay.

[0008] Furthermore, the 1s delay pick-up relay is a normally closed relay.

[0009] Furthermore, the 0.25s delay pick-up relay is a normally closed relay.

[0010] Furthermore, the control relay is a normally closed relay.

[0011] Furthermore, the circuit breaker is connected to the onboard DC 28V power supply.

[0012] Furthermore, the control button is a self-resetting button.

[0013] Furthermore, the delayed release time of the delayed release relay is 15s.

[0014] A control method for the helicopter windshield washing control circuit comprises the following steps:

[0015] The first step is to press the control button and then release it, the delayed release relay is energized, the normally open contact of the delayed release relay is connected, the 1s delay pick-up relay is energized, the normally closed contact of the 1s delay pick-up relay is connected, the control relay is energized, the normally open contacts of the first and second pairs of contacts of the control relay are connected, and the left flushing pump and the right flushing pump are both working;

[0016] Step 2: After 1s, the normally open contact of the 1s delay pick-up relay is connected, the control relay is powered off, the normally closed contacts of the first and second pairs of contacts of the control relay are connected, and the left and right flushing pumps do not work; the 0.25s delay pick-up relay is powered on, the 0.25s delay pick-up relay normally closed contact is connected, after 0.25s, the 0.25s delay pick-up relay normally open contact is connected, the 1s delay pick-up relay is powered off, the 1s delay pick-up relay normally closed contact is connected, the control relay is powered on, the first and second pairs of contacts of the control relay normally open contacts are connected, and the left and right flushing pumps work;

[0017] The third step is to repeat the second step until the delayed release relay is de-energized after 15 seconds, the normally closed contact is connected, and the control process ends.

[0018] Beneficial Effects

[0019] The windshield washing control circuit and control method designed by the present invention can solve the problem that the pilot needs to keep pressing the washing pump control button and operate the washing control button and the windshield wiper button at the same time during the flight without changing the installation position and type of the control button, thereby effectively reducing the burden on the pilot. The design of periodic intermittent spraying of the washing liquid enables the washing pump to work intermittently when the windshield wiper swings when used in conjunction with the windshield wiper, thereby controlling the spraying amount of the washing liquid and avoiding excessive consumption of the washing liquid and the situation where there is no washing liquid available when it is urgently needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a schematic diagram of a windshield washing control circuit. DETAILED DESCRIPTION

[0021] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] like Figure 1 As shown, a helicopter windshield washing circuit disclosed in the present invention comprises a circuit breaker 1, a control button 2, a left washing pump 3, a right washing pump 4, a delayed release relay 5, a 1s delay pick-up relay 6, a 0.25s delay pick-up relay 7, and a control relay 8. The circuit breaker 1 is connected to one contact of the control button, the other contact of the control button 2 is connected to the positive end of the coil of the delayed release relay 5, and the negative end of the coil of the delayed release relay 5 is connected to the power ground; the common contact of the delayed release relay 5 is connected to the circuit breaker 1, the normally open contact of the delayed release relay 5 is respectively connected to the positive end of the coil of the 1s delay pick-up relay 6 and the common contact of the 1s delay pick-up relay 6, and the negative end of the coil of the 1s delay pick-up relay 6 is connected to the power ground through the 0.25s delay The common contact and normally closed contact of s pickup relay 7 are connected to the power ground, the normally open contact of 1s delay pickup relay 6 is connected to the positive terminal of 0.25s delay pickup relay 7 coil, and the negative terminal of 0.25s delay pickup relay 7 coil is connected to the power ground, the normally closed contact of 1s delay pickup relay 6 is connected to the positive terminal of control relay 8 coil, and the negative terminal of control relay 8 coil is connected to the power ground, the common contact of the first pair of contacts of control relay 8 is connected to circuit breaker 1, the normally open contacts of the first pair of contacts are connected to the positive terminal of left flushing pump 3, and the negative terminal of left flushing pump 3 is connected to the power ground, the common contact of the second pair of contacts of control relay 8 is connected to circuit breaker 1, the normally open contacts of the second pair of contacts are connected to the positive terminal of right flushing pump 4, and the negative terminal of right flushing pump 4 is connected to the power ground.

[0024] The control method of the control circuit is:

[0025] After pressing the control button 2 and releasing it immediately, the helicopter power signal is transmitted to the positive end of the delayed release relay 5 coil through the control button 2 and the lines MA1 and MA2, so that the delayed release relay 5 works;

[0026] The power signal is transmitted to the control relay 8 through the lines MA1, MA6, MA4, the normally open contact of the delayed release relay 5, the lines MA7, MA8, the normally closed contact of the delay 1s pickup relay 6, and the line MA11, and the control relay 8 works, so that the power signal is transmitted to the left flushing pump 3 through the lines MA1, MA6, MA5, one normally open contact of the control relay 8, and the line MA14, so that the left flushing pump 3 works. At the same time, the power signal is transmitted to the right flushing pump 4 through the lines MA1, MA6, another normally open contact of the control relay 8, and the line MA15, so that the right flushing pump 4 works;

[0027] The power signal is transmitted to the positive end of the coil of the 1s delay pick-up relay 6 through the lines MA1, MA4, the normally open contact of the delayed release relay 5, and the line MA7. The 1s delay pick-up relay 6 works after 1s, thereby disconnecting the power signal transmitted to the control relay 8, disconnecting the normally open contact of the control relay 8, disconnecting the power signal of the left flushing pump 3 and the right flushing pump 4, and stopping the left flushing pump 3 and the right flushing pump 4;

[0028] The power signal is transmitted to the positive terminal of the coil of the delay 0.25s pickup relay 7 through lines MA1, MA4, the normally open contact of the delayed release relay 5, lines MA7, MA8, and the normally open contact of the delay 1s pickup relay 6. The delay 0.25s pickup relay 7 It works after 0.25s, thereby disconnecting the negative ground signal of the 1s delay pickup relay 6, and closing the normally closed contact of the 1s delay pickup relay 6. The power signal is retransmitted to the positive end of the coil of the control relay 8 through the lines MA1, MA6, MA4, the normally open contact of the delayed release relay 5, the line MA7, the line MA8, the normally closed contact of the 1s delay pickup relay 6, and the line MA11, and the control relay 8 works, thereby retransmitting the power signal to the left flushing pump 3 through the lines MA1, MA6, MA5, one normally open contact of the control relay 8, and the line MA14, so that the left flushing pump 3 works. At the same time, the power signal is also retransmitted to the right flushing pump 4 through the lines MA1, MA6, another normally open contact of the control relay 8, and the line MA15, so that the right flushing pump 4 works, and this is repeated;

[0029] The delayed release relay 5 stops working after power is cut off and working for 15s, and the positive end of the coil of the 1s delayed energizing relay 6, the positive end of the coil of the 0.25s delayed energizing relay 7, the positive end of the coil of the control relay 8, and the power supply signals of the left flushing pump 3 and the right flushing pump 4 in the control circuit are all disconnected, causing the left flushing pump 3 and the right flushing pump 4 to stop working.

[0030] If the left flushing pump 3 and the right flushing pump 4 need to work again, the control button 2 needs to be pressed again, and the above process is repeated until the scraping effect is achieved.

[0031] The control circuit structure of the present invention includes a delayed release relay, two delayed pick-up relays, a control relay and two flushing pumps. The control method is that the control button directly controls the power on and off of the circuit, and is designed so that the control button controls the delayed release relay, and then the delayed release relay controls the power on and off of the circuit. The control button is still installed on the switch panel on the ceiling of the cockpit, and is a self-resetting type. The operation method is changed from long-term pressing to short-term pressing and then releasing. The delayed release of the delayed release relay can keep the flushing control circuit energized. The circuit controls the periodic intermittent operation of the flushing pump through the alternating operation of the two delayed pick-up relays, which can effectively control the spraying amount of the flushing liquid, and prevent the pilot from constantly pressing the control button and over-consuming the flushing liquid.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A helicopter windshield washing control circuit, characterized in that: The invention comprises a circuit breaker (1), a control button (2), a left flushing pump (3), a right flushing pump (4), a time-delay release relay (5), a 1s delay pick-up relay (6), a 0.25s delay pick-up relay (7), and a control relay (8). The circuit breaker (1) is connected to one contact of the control button (2), another contact of the control button (2) is connected to the positive end of the coil of the time-delay release relay (5), and the negative end of the coil of the time-delay release relay (5) is connected to the power supply ground; the common contact of the time-delay release relay (5) is connected to the circuit breaker (1), the normally open contact of the time-delay release relay (5) is respectively connected to the positive end of the coil of the 1s delay pick-up relay (6) and the common contact of the 1s delay pick-up relay (6), and the negative end of the coil of the 1s delay pick-up relay (6) is connected to the power supply ground through the 0.25s delay pick-up relay (7). ) are connected to the power ground, the normally open contact of the 1s delay pick-up relay (6) is connected to the positive end of the coil of the 0.25s delay pick-up relay (7), the negative end of the coil of the 0.25s delay pick-up relay (7) is connected to the power ground, the normally closed contact of the 1s delay pick-up relay (6) is connected to the positive end of the coil of the control relay (8), the negative end of the coil of the control relay (8) is connected to the power ground, the common contact of the first pair of contacts of the control relay (8) is connected to the circuit breaker (1), the normally open contact of the first pair of contacts is connected to the positive end of the left flushing pump (3), the negative end of the left flushing pump (3) is connected to the power ground, the common contact of the second pair of contacts of the control relay (8) is connected to the circuit breaker (1), the normally open contact of the second pair of contacts is connected to the positive end of the right flushing pump (4), and the negative end of the right flushing pump (4) is connected to the power ground.

2. A helicopter windshield washing control circuit according to claim 1, characterized in that: The time-delay release relay (5) is a normally closed relay.

3. A helicopter windshield washing control circuit according to claim 2, characterized in that: The 1s delay pick-up relay (6) is a normally closed relay.

4. A helicopter windshield washing control circuit according to claim 3, characterized in that: The 0.25s delay pick-up relay (7) is a normally closed relay.

5. A helicopter windshield washing control circuit according to claim 4, characterized in that: The control relay (8) is a normally closed relay.

6. A helicopter windshield washing control circuit according to claim 5, characterized in that: The circuit breaker (1) is connected to the onboard 28V DC power supply.

7. A helicopter windshield washing control circuit according to claim 6, characterized in that: The control button (2) is a self-resetting button.

8. A helicopter windshield washing control circuit according to claim 7, characterized in that: The delayed release time of the delayed release relay (5) is 15s.

9. A control method for a helicopter windshield washing control circuit as claimed in claim 8, characterized in that: The following steps are involved: In the first step, the control button (2) is pressed and then released immediately, the time-delay release relay (5) is energized, the normally open contact of the time-delay release relay (5) is connected, the 1s delay pickup relay (6) is energized, the normally closed contact of the 1s delay pickup relay (6) is connected, the control relay (8) is energized, the normally open contacts of the first pair of contacts and the second pair of contacts of the control relay (8) are both connected, and the left flushing pump (3) and the right flushing pump (4) are both in operation; Step 2: After 1 second, the normally open contact of the relay (6) is connected after a delay of 1 second, the control relay (8) is powered off, and the normally closed contacts of the first and second pairs of contacts of the control relay (8) are both connected, and the left flushing pump (3) and the right flushing pump (4) are both inoperative; after a delay of 0.25 second, the relay (7) is powered on after a delay of 0.25 second, the normally closed contact of the relay (7) is connected after a delay of 0.25 second, the normally open contact of the relay (7) is connected after a delay of 1 second, the relay (6) is powered off after a delay of 1 second, the normally closed contact of the relay (6) is connected after a delay of 1 second, the control relay (8) is powered on, and the normally open contacts of the first and second pairs of contacts of the control relay (8) are both connected, and the left flushing pump (3) and the right flushing pump (4) are both inoperative; Step 3: Repeat step 2 until the delayed release relay (5) is de-energized after 15 seconds, the normally closed contact is connected, and the control process ends.

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