Emergency automatic unlocking control system for aircraft refueling vehicle

Abstract

The utility model discloses an emergency automatic unlocking control system for an aircraft refueling vehicle. The emergency automatic unlocking control system comprises a power switch, an overrun interlocking pressure switch, an unlocking relay, an emergency stop relay, an engine emergency stop switch and an engine ignition switch. The system is characterized in that the overrun interlocking pressure switch is used for identifying the safe escape state of the vehicle; the unlocking relay is used for unlocking the sudden stop state of the engine; the emergency stop relay is used for controlling flameout of the engine in the emergency state of the engine. Whether the overrunning interlocking device is started or not can be recognized, the engine emergency flameout function can be automatically unlocked in time, the situation that an operator does not reset an engine emergency stop switch in time is avoided, the operator does not need to get off the vehicle for resetting, the operator can rapidly leave the site, and the safe escape speed of the vehicle is increased.

Description

Technical Field

[0001] This utility model relates to the field of aviation ground equipment technology, and in particular to an emergency automatic unlocking control system for aircraft refueling trucks. Background Technology

[0002] Aircraft refueling trucks are special vehicles used for the safe refueling of aircraft. They have high safety protection requirements, requiring the ability to quickly leave the refueling site in case of an emergency to ensure aircraft safety. Aircraft refueling trucks are generally required to be equipped with engine emergency stop and safety escape devices. The engine emergency stop is achieved through a self-locking emergency stop switch; pressing it shuts off the engine, and restarting requires resetting the switch; otherwise, the engine will not start. In an emergency, if the operator fails to reset the engine emergency stop button in time, they will need to get out of the vehicle again to reset the switch, which slows down the vehicle's escape speed and increases the risk of an accident.

[0003] In conclusion, it is necessary to propose an automatic unlocking control system for emergency stop of aircraft refueling trucks. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide an automatic unlocking control system for emergency stop of aircraft refueling trucks. This system can automatically identify the vehicle's emergency escape status and automatically unlock the engine emergency stop function. Even if the engine emergency stop switch is not reset, the vehicle can quickly leave the scene, greatly improving vehicle safety.

[0005] This utility model provides the following technical solution:

[0006] An emergency automatic unlocking control system for an aircraft refueling truck includes: a power switch, an overlock pressure switch, an unlocking relay, an emergency stop relay, an engine emergency stop switch, and an engine ignition switch. Its features are: the overlock pressure switch is used for identifying the vehicle's safe escape status; the unlocking relay is used to unlock the engine emergency stop status; and the emergency stop relay is used to cut off the ignition switch from the ON position, controlling the engine to shut down in an emergency.

[0007] Preferably, the overrun interlock pressure switch is a pneumatic pressure detection switch installed on the vehicle overrun interlock air circuit to detect whether the overrun interlock device is open. When the overrun interlock device air pressure is detected to exceed a preset value, the normally open circuit of the overrun interlock pressure switch closes to control the unlocking relay to engage. Its normally open input terminal is connected to the output terminal of the power switch via a wire, and its normally open output terminal is connected to the positive terminal of the unlocking relay coil via a wire.

[0008] Preferably, the unlocking relay has one normally closed port, which is installed on the vehicle and used to unlock the engine emergency stop function. When its control coil is energized, its normally closed port opens, temporarily disabling the engine emergency stop switch function. Its control coil positive terminal is connected to the output terminal of the overrunning interlock pressure switch via a wire, its control coil negative terminal is grounded with the vehicle battery, its normally closed input terminal is connected to the output terminal of the engine emergency stop switch via a wire, and its normally closed output terminal is connected to the positive terminal of the emergency stop relay control coil via a wire.

[0009] Preferably, the emergency stop relay has one normally closed port, which is installed on the vehicle to cut off the vehicle's ignition switch to the ON position, thereby shutting off the engine. Its control coil positive terminal is connected to the unlocking relay output terminal via a wire, its control coil negative terminal is grounded with the vehicle battery, its normally closed input terminal is connected to the vehicle's ignition switch ON position terminal via a wire, and its normally closed output terminal is connected to other electrical equipment in the vehicle via a wire. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the system structure and circuit of this utility model.

[0012] In the diagram: 1. Power switch; 2. Overrun interlock pressure switch; 3. Unlock relay; 4. Emergency stop relay; 5. Engine emergency stop switch; 6. Ignition switch ON position. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0015] like Figure 1 As shown, an emergency automatic unlocking control system for an aircraft refueling truck includes: a power switch 1, an overrunning interlock pressure switch 2, an unlocking relay 3, an emergency stop relay 4, an engine emergency stop switch 5, and an engine ignition switch 6. The system is characterized in that: the overrunning interlock pressure switch 2 is used for identifying the vehicle's safe escape status; the unlocking relay 3 is used to unlock the engine emergency stop status; and the emergency stop relay 4 is used to cut off the ON position of the ignition switch 5, controlling the engine to shut down in an emergency.

[0016] The overrun interlock pressure switch 2 is a pneumatic pressure detection switch installed on the vehicle overrun interlock air circuit. It is used to detect whether the overrun interlock device is open. When the overrun interlock device air pressure is detected to exceed the preset value, the normally open circuit of the overrun interlock pressure switch 2 is closed to control the unlocking relay 3 to be energized. Its normally open input terminal is connected to the output terminal of the power switch 1 through a wire, and its normally open output terminal is connected to the positive terminal of the unlocking relay 3 coil through a wire.

[0017] The unlocking relay 3 has one normally closed port, which is installed on the vehicle and used to unlock the engine emergency stop function. When its control coil is energized, its normally closed port is opened, causing the engine emergency stop switch 5 to temporarily fail. Its control coil positive terminal is connected to the output terminal of the overrunning interlock pressure switch 2 through a wire, and its control coil negative terminal is grounded with the vehicle battery. Its normally closed input terminal is connected to the output terminal of the engine emergency stop switch 5 through a wire, and its normally closed output terminal is connected to the positive terminal of the control coil of the emergency stop relay 4 through a wire.

[0018] The emergency stop relay 4 has one normally closed port, which is installed on the vehicle to cut off the vehicle ignition switch ON position 6 and shut off the engine. Its control coil positive terminal is connected to the output terminal of the unlocking relay 3 through a wire, its control coil negative terminal is grounded with the vehicle battery, its normally closed input terminal is connected to the vehicle ignition switch ON position 6 terminal through a wire, and its normally closed output terminal is connected to other electrical equipment in the vehicle through a wire.

[0019] Example 1: When power switch 1 is closed, the system is started and the operation begins.

[0020] When the engine emergency stop switch 5 is closed, the coil of the emergency stop relay 4 is energized and engages, cutting off the ignition switch ON position 6, the engine shuts off, the vehicle loses power, and the engine cannot be restarted. Then, the overrunning interlock device is activated, the overrunning interlocking pressure switch 2 detects the pressure signal, its normally open circuit closes, energizing the coil of the unlocking relay 3, cutting off the output signal of the engine emergency stop switch 5, the coil of the emergency stop relay 4 is de-energized, the coil resets, restoring the function of the ignition switch ON position 6, the vehicle regains power, and the engine can be restarted by rotating the ignition switch.

[0021] This utility model provides an emergency automatic unlocking control system for aircraft refueling trucks. It can identify whether the overrunning interlock device is activated and automatically unlock the engine emergency shutdown function in a timely manner. This avoids the situation where the operator fails to reset the engine emergency stop switch in time, and the operator does not need to get out of the vehicle to reset it. This allows the operator to leave the scene quickly and improves the vehicle's safe escape speed.

[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present patent. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present patent shall be included within the protection scope of the present patent.

Claims

1. An emergency automatic unlocking control system for aircraft refueling trucks, comprising: A power switch, an overrunning interlock pressure switch, an unlocking relay, an emergency stop relay, an engine emergency stop switch, and an engine ignition switch are characterized in that: the overrunning interlock pressure switch is used for identifying the vehicle's safe escape state; the unlocking relay is used to unlock the engine emergency stop state; and the emergency stop relay is used to cut off the ignition switch from the ON position to control the engine to shut down in an emergency.

2. The emergency automatic unlocking control system for an aircraft refueling truck according to claim 1, characterized in that: The overrun interlock pressure switch is a pneumatic pressure detection switch installed on the vehicle overrun interlock air circuit. It is used to detect whether the overrun interlock device is open. When the overrun interlock device air pressure is detected to exceed the preset value, the normally open circuit of the overrun interlock pressure switch is closed to control the unlocking relay to engage. Its normally open input terminal is connected to the output terminal of the power switch through a wire, and its normally open output terminal is connected to the positive terminal of the unlocking relay coil through a wire.

3. The emergency automatic unlocking control system for an aircraft refueling truck according to claim 1, characterized in that: The unlocking relay has one normally closed port, which is installed on the vehicle and used to unlock the engine emergency stop function. When its control coil is energized, its normally closed port opens, temporarily disabling the engine emergency stop switch function. Its control coil positive terminal is connected to the output terminal of the overrunning interlock pressure switch via a wire, its control coil negative terminal is grounded with the vehicle battery, its normally closed input terminal is connected to the output terminal of the engine emergency stop switch via a wire, and its normally closed output terminal is connected to the positive terminal of the emergency stop relay control coil via a wire.

4. The emergency automatic unlocking control system for an aircraft refueling truck according to claim 1, characterized in that: The emergency stop relay has one normally closed port, which is installed on the vehicle to cut off the vehicle's ignition switch to the ON position, thereby shutting off the engine. Its control coil positive terminal is connected to the unlocking relay output terminal via a wire, and its control coil negative terminal is grounded with the vehicle battery. Its normally closed input terminal is connected to the vehicle's ignition switch ON position terminal via a wire, and its normally closed output terminal is connected to other electrical equipment in the vehicle via a wire.

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