A helicopter windshield washing control circuit and control method

Abstract

This invention belongs to the field of system electrical control technology, and relates to a helicopter windshield flushing control circuit and control method. The circuit includes a circuit breaker, a control button, a left flushing pump, a right flushing pump, a time-delayed release relay, a 1-second time-delayed activation relay, a 0.25-second time-delayed activation relay, and a control relay. The control method involves the control button directly controlling the circuit's energization and de-energization. The design allows the control button to control the time-delayed release relay, which in turn controls the circuit's energization and de-energization. The control button remains mounted on the switch panel in the cockpit ceiling and is self-resetting. The operation method has been changed from a long-term press to a short-term press followed by release. The delayed release of the time-delayed release relay keeps the flushing control circuit continuously energized. The circuit uses two time-delayed activation relays to alternately operate, controlling the periodic intermittent operation of the flushing pumps, effectively controlling the flushing fluid spray volume and preventing the pilot from continuously pressing the control button and excessively consuming flushing fluid.

Description

Technical Field

[0001] This invention belongs to the field of system electrical control technology, and relates to a helicopter windshield washing control circuit and control method. Background Technology

[0002] During helicopter flight, dirt, dust, insect residue, and other contaminants accumulate on the windshield, obscuring the pilot's vision. The windshield washing control system sprays washing fluid onto the windshield to clean it, while the windshield wipers simultaneously clean the glass, effectively removing contaminants and ensuring the pilot has a clear view, thus improving flight safety.

[0003] The existing windshield washer control system operates by continuously pressing a washer pump control button. The washer fluid in the pump is then sprayed onto the windshield through nozzles to clean it. Once the control button is released, the washer pump immediately stops. The washer pump control button is located on a switch panel in the cockpit ceiling. A drawback is that if the pilot needs to wash the windshield during flight, they must keep their arm raised and continuously pressing the button while simultaneously activating the windshield wipers, increasing the pilot's workload. Summary of the Invention

[0004] The technical problem solved by this invention: This invention proposes a helicopter windshield flushing control circuit and method to solve the problem of windshield spray control in the prior art, which relies on continuous pressing of the flushing pump control button. The circuit structure of this invention includes a delayed release relay, two delayed activation relays, a control relay, and two flushing pumps. The control method involves the control button directly controlling the circuit's energization and de-energization. The design allows the control button to control the delayed release relays, which in turn control the circuit's energization and de-energization. The control button is still mounted on the switch panel in the cockpit ceiling and is self-resetting. The operation method has been changed from a long-term press to a short-term press followed by release. The delayed release of the delayed release relays allows the flushing control circuit to be continuously energized. The circuit controls the periodic intermittent operation of the flushing pumps through the alternating operation of the two delayed activation relays, effectively controlling the amount of flushing fluid sprayed and preventing the pilot from continuously pressing the control button and excessively consuming flushing fluid.

[0005] Technical solution of the present invention

[0006] A helicopter windshield washer control circuit includes a circuit breaker, a control button, a left washer pump, a right washer pump, a time-delayed release relay, a 1-second time-delayed activation relay, a 0.25-second time-delayed activation relay, and a control relay. One contact of the circuit breaker is connected to the control button, and another contact of the control button is connected to the positive terminal of the time-delayed release relay coil. The negative terminal of the time-delayed release relay coil is connected to ground. The common contact of the time-delayed release relay is connected to the circuit breaker. The normally open contacts of the time-delayed release relay are connected to the positive terminal of the 1-second time-delayed activation relay coil and the common contact of the 1-second time-delayed activation relay, respectively. The negative terminal of the 1-second time-delayed activation relay coil is connected to the 0.25-second time-delayed activation relay. The common contact and normally closed contact of the relay are connected to the power supply ground. The normally open contact of the relay that activates after a 1-second delay is connected to the positive terminal of the relay coil that activates after a 0.25-second delay. The negative terminal of the relay coil that activates after a 0.25-second delay is connected to the power supply ground. The normally closed contact of the relay that activates after a 1-second delay is connected to the positive terminal of the control relay coil. The negative terminal of the control relay coil is connected to the power supply 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 terminal of the left flushing pump. The negative terminal of the left flushing pump is connected to the power supply 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 terminal of the right flushing pump. The negative terminal of the right flushing pump is connected to the power supply ground.

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

[0008] Furthermore, the relay with a 1-second delay is a normally closed relay.

[0009] Furthermore, the relay with a 0.25s delay is a normally closed relay.

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

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

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

[0013] Furthermore, the delay release relay has a delay release time of 15 seconds.

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

[0015] First, press and release the control button. The delayed release relay is energized, and the normally open contact of the delayed release relay is closed. After a 1-second delay, the energized pull-in relay is activated, and after a 1-second delay, the normally closed contact of the pull-in relay is closed. The control relay is energized, and the normally open contacts of the first and second pairs of contacts of the control relay are closed. Both the left and right flushing pumps are activated.

[0016] The second step involves a 1-second delay after which the normally open contact of the relay is activated, de-energizing the control relay. This activates the normally closed contacts of both the first and second pairs of contacts on the control relay, disabling both the left and right flushing pumps. A 0.25-second delay then activates the relay, closing its normally closed contacts. After another 0.25 seconds, the normally open contact of the relay is activated again, closing after a 1-second delay. This activates the normally closed contact of the relay, energizing the control relay and closing the normally open contacts of both the first and second pairs of contacts, enabling both the left and right flushing pumps to operate.

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

[0018] Beneficial effects

[0019] The windshield washer control circuit and method designed in this invention can solve the problem of pilots needing to continuously press the washer pump control button during flight, and simultaneously operate both the washer control button and the windshield wiper button, without changing the installation position and type of the control button. This effectively reduces the pilot's workload. The design of periodic intermittent spraying of washer fluid allows the washer pump to work intermittently with the windshield wipers when used in conjunction with them, controlling the amount of washer fluid sprayed and avoiding excessive consumption that could result in a lack of washer fluid when urgently needed. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the windshield flushing control circuit of the present invention. Detailed Implementation

[0021] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0022] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] like Figure 1 As shown, this invention discloses a helicopter windshield washing circuit, including a circuit breaker 1, a control button 2, a left washing pump 3, a right washing pump 4, a time-delayed release relay 5, a 1-second delay-activated relay 6, a 0.25-second delay-activated relay 7, and a control relay 8. One contact of the circuit breaker 1 is connected to the control button 2, and the other contact of the control button 2 is connected to the positive terminal of the coil of the time-delayed release relay 5. The negative terminal of the coil of the time-delayed release relay 5 is connected to the power ground. The common contact of the time-delayed release relay 5 is connected to the circuit breaker 1. The normally open contact of the time-delayed release relay 5 is connected to the positive terminal of the coil of the 1-second delay-activated relay 6 and the common contact of the 1-second delay-activated relay 6, respectively. The negative terminal of the coil of the 1-second delay-activated relay 6 is connected via a 0.25-second delay-activated relay 8. The common contact and normally closed contact of relay 7 are connected to the power supply ground. The normally open contact of relay 6, which is activated after a 1-second delay, is connected to the positive terminal of the coil of relay 7, which is activated after a 0.25-second delay. The negative terminal of the coil of relay 7, which is activated after a 0.25-second delay, is connected to the power supply ground. The normally closed contact of relay 6, which is activated after a 1-second delay, is connected to the positive terminal of the coil of control relay 8. The negative terminal of the coil of control relay 8 is connected to the power supply ground. The common contact of the first pair of contacts of control relay 8 is connected to circuit breaker 1. The normally open contact of the first pair of contacts is connected to the positive terminal of the left flushing pump 3. The negative terminal of the left flushing pump 3 is connected to the power supply ground. The common contact of the second pair of contacts of control relay 8 is connected to circuit breaker 1. The normally open contact of the second pair of contacts is connected to the positive terminal of the right flushing pump 4. The negative terminal of the right flushing pump 4 is connected to the power supply ground.

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

[0025] After pressing and releasing the control button 2, the helicopter power signal is transmitted through the control button 2 and lines MA1 and MA2 to the positive terminal of the coil of the time-delayed release relay 5, causing the time-delayed release relay 5 to work.

[0026] The power signal is transmitted to the control relay 8 through lines MA1, MA6, MA4, the normally open contact of the time-delayed release relay 5, lines MA7, MA8, the normally closed contact of the 1s-delayed activation relay 6, and line MA11. The control relay 8 is activated, which in turn transmits the power signal to the left flush pump 3 through lines MA1, MA6, MA5, one normally open contact of the control relay 8, and line MA14, causing the left flush pump 3 to operate. At the same time, the power signal is transmitted to the right flush pump 4 through lines MA1, MA6, another normally open contact of the control relay 8, and line MA15, causing the right flush pump 4 to operate.

[0027] The power signal is transmitted through lines MA1, MA4, the normally open contact of the time-delayed release relay 5, and line MA7 to the positive terminal of the coil of the 1-second delay-activated relay 6. After the 1-second delay, the relay 6 is activated and then operates, thereby disconnecting the power signal transmitted to the control relay 8, opening the normally open contact of the control relay 8, disconnecting the power signals of the left flush pump 3 and the right flush pump 4, and stopping the left flush pump 3 and the right flush pump 4 from working.

[0028] The power signal is transmitted through lines MA1, MA4, the normally open contact of the time-delayed release relay 5, lines MA7, MA8, and the normally open contact of the 1-second delay-activated relay 6 to the positive terminal of the coil of the 0.25-second delay-activated relay 7. The relay 7 is activated after a 0.25-second delay. After 0.25 seconds, the signal at the negative terminal of the 1-second delayed-on relay 6 is disconnected, and the normally closed contact of the 1-second delayed-on relay 6 is activated. The power signal is then transmitted back to the positive terminal of the coil of the control relay 8 through lines MA1, MA6, MA4, the normally open contact of the delayed-on relay 5, lines MA7, MA8, the normally closed contact of the 1-second delayed-on relay 6, and line MA11, causing the control relay 8 to operate. This causes the power signal to be transmitted back to the left flush pump 3 through lines MA1, MA6, MA5, one normally open contact of the control relay 8, and line MA14, causing the left flush pump 3 to operate. At the same time, the power signal is also transmitted back to the right flush pump 4 through lines MA1, MA6, another normally open contact of the control relay 8, and line MA15, causing the right flush pump 4 to operate. This process is repeated.

[0029] The delayed release relay 5 stops working after being powered off and operating for 15 seconds. The positive terminal of the coil of the control circuit is activated by the relay 6 after a 1-second delay, the positive terminal of the coil of the relay 7 after a 0.25-second delay, the positive terminal of the coil of the control relay 8, and the power signals of the left flush pump 3 and the right flush pump 4 are all disconnected, causing the left flush pump 3 and the right flush pump 4 to stop working.

[0030] If the left flush pump 3 and right flush pump 4 need to be activated again, press control button 2 again and repeat the above process until the scraping effect is achieved.

[0031] The control circuit structure of this invention includes one delayed release relay, two delayed activation relays, one control relay, and two flushing pumps. The control method involves directly controlling the circuit's energization and de-energization via a control button. The design allows the control button to control the delayed release relays, which in turn control the circuit's energization and de-energization. The control button remains mounted on the switch panel in the cockpit ceiling and is self-resetting. Operation has been changed from a prolonged press to a short press followed by release. The delayed release of the delayed release relays ensures continuous energization of the flushing control circuit. The circuit, through the alternating operation of the two delayed activation relays, controls the periodic intermittent operation of the flushing pumps, effectively controlling the flushing fluid spray volume and preventing pilots from continuously pressing the control button and excessively consuming flushing fluid.

[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 person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A helicopter windshield washing control circuit, characterized in that, The system includes a circuit breaker (1), a control button (2), a left flushing pump (3), a right flushing pump (4), a time-delayed release relay (5), a 1-second time-delayed activation relay (6), a 0.25-second time-delayed activation relay (7), and a control relay (8). One contact of the circuit breaker (1) is connected to one of the contacts of the control button (2), and the other contact of the control button (2) is connected to the positive terminal of the coil of the time-delayed release relay (5). The negative terminal of the coil of the time-delayed release relay (5) is connected to the power ground. The common contact of the time-delayed release relay (5) is connected to the circuit breaker (1). The normally open contacts of the time-delayed release relay (5) are connected to the positive terminal of the coil of the 1-second time-delayed activation relay (6) and the common contact of the 1-second time-delayed activation relay (6), respectively. The negative terminal of the coil of the 1-second time-delayed activation relay (6) is connected to the 0.25-second time-delayed activation relay (7). The common contact and normally closed contact of the relay (6) are connected to the power supply ground. The normally open contact of the relay (6) is connected to the positive terminal of the coil of the relay (7) which is activated after a delay of 1s. The negative terminal of the coil of the relay (7) which is activated after a delay of 0.25s is connected to the power supply ground. The normally closed contact of the relay (6) which is activated after a delay of 1s is connected to the positive terminal of the coil of the control relay (8). The negative terminal of the coil of the control relay (8) is connected to the power supply 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 terminal of the left flushing pump (3). The negative terminal of the left flushing pump (3) is connected to the power supply 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 terminal of the right flushing pump (4). The negative terminal of the right flushing pump (4) is connected to the power supply ground. The control method using the aforementioned helicopter windshield washing control circuit includes the following steps: First step, press the control button (2) and then release it. The delayed release relay (5) is energized, and the normally open contact of the delayed release relay (5) is closed. The energized relay (6) is activated after a 1-second delay, and the normally closed contact of the energized relay (6) is closed after a 1-second delay. The energized control relay (8) is activated, and the normally open contacts of the first pair of contacts and the second pair of contacts of the control relay (8) are closed. The left flushing pump (3) and the right flushing pump (4) are both working. In the second step, after 1 second, the normally open contact of relay (6) is activated after a 1 second delay, the control relay (8) is de-energized, and the normally closed contacts of the first and second pairs of contacts of the control relay (8) are both activated, so the left flushing pump (3) and the right flushing pump (4) do not work; after a 0.25 second delay, relay (7) is activated, and the normally closed contact of relay (7) is activated after a 0.25 second delay. After 0.25 seconds, the normally open contact of relay (7) is activated, and after a 1 second delay, relay (6) is de-energized, and the normally closed contact of relay (6) is activated after a 1 second delay, so the control relay (8) is activated, and the normally open contacts of the first and second pairs of contacts of the control relay (8) are both activated, so the left flushing pump (3) and the right flushing pump (4) both work; The third step is to repeat the second step until the delay release relay (5) is de-energized after 15 seconds, the normally closed contact is closed, and the control process ends.

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

3. The helicopter windshield washing control circuit according to claim 2, characterized in that, The relay (6) is a normally closed relay that is activated after a 1-second delay.

4. The helicopter windshield washing control circuit according to claim 3, characterized in that, The relay (7) is normally closed and has a 0.25s delay before it is activated.

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 machine's DC 28V 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 delay release relay (5) has a delay release time of 15s.

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