Safety control systems and methods for construction machinery

Abstract

This invention relates to the field of parking brake control, specifically to a safety control system and method for construction machinery. The safety control system includes: a battery, a pump return solenoid valve, and a parking solenoid valve; it also includes: a parking switch connected to the pump return solenoid valve and the parking solenoid valve; and a proximity switch adapted to be installed on the seat of the construction machinery and connected to the pump return solenoid valve and the parking solenoid valve. The pump return solenoid valve and the parking solenoid valve are configured to de-energize and park the vehicle when the parking switch is in the parking position and / or the proximity switch detects that the seat is unoccupied. This safety control system for construction machinery employs various design measures to maximize the personal safety of personnel around the vehicle.

Description

Technical Field

[0001] This invention relates to the field of parking brake control, and more specifically to a safety control system and safety control method for engineering machinery. Background Technology

[0002] A pneumatic tire roller is a machine that uses multiple inflatable rubber tires to compact road surfaces. When the roller is to be stopped, the operator needs to manually return the gear lever to the neutral position and press the parking brake switch.

[0003] In actual operation, due to the busy and fast-paced nature of various tasks at the construction site, the following situation may occur: A driver, while driving, suddenly has an urgent matter to attend to and needs to get out of the vehicle. However, due to negligence, they may forget to return the gear lever to the neutral position before getting out, or although they have returned it, it may not be fully returned to the neutral position. Simultaneously, the vehicle's parking solenoid valve may not be engaged; that is, the parking switch is not activated and the parking solenoid valve is not engaged. If the driver urgently leaves the vehicle at this time, the vehicle will still be moving at a slow speed. If there are still personnel around the vehicle at this time, it may cause personal injury.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] To improve or solve the technical problem in existing technologies where the vehicle remains in a slow-moving state even when the driver leaves the vehicle in an emergency, potentially causing personal injury to surrounding personnel, this invention provides a safety control system for construction machinery. The safety control system includes: a battery, a pump return solenoid valve, and a parking solenoid valve; it also includes: a parking switch connected to the pump return solenoid valve and the parking solenoid valve; and a proximity switch adapted to be installed on the seat of the construction machinery and connected to the pump return solenoid valve and the parking solenoid valve; the pump return solenoid valve and the parking solenoid valve are configured to de-energize and park the vehicle when the parking switch is in the parking position and / or the proximity switch detects that the seat is vacated.

[0006] The safety control system for construction machinery of this invention includes a battery, a return solenoid valve, a parking solenoid valve, a parking switch, and a proximity switch. The battery provides power to the vehicle; when the return solenoid valve is energized, the engine outputs power; when de-energized, the engine power output is cut off; when the parking solenoid valve is energized, the vehicle is not parked; when de-energized, the vehicle is parked; the parking switch controls the circuit and is controlled by the driver; the proximity switch is mounted on the seat and senses the driver's seat position by detecting the weight on the seat. Triggering either the proximity switch or the parking switch synchronously de-energizes the return solenoid valve and the parking solenoid valve, ensuring parking braking without shutting off the engine, maximizing the safety of people around the vehicle. Through these features, the safety control system for construction machinery of this invention employs multiple design measures to maximize the safety of people around the vehicle.

[0007] Furthermore, the system also includes a controller connected to the return solenoid valve and the parking solenoid valve, with the parking switch and the inductive switch arranged in parallel between the controller and the battery. The controller is configured to determine the seat's status based on the duration of its vacancy, and to de-energize the return solenoid valve and the parking solenoid valve when the parking switch is in the parking position and / or when the seat is unoccupied. Through these settings, the controller can accurately identify the actual seat status, avoiding misjudgments of brief occupancy. This ensures that when the driver is truly unoccupied or the parking switch is switched to the parking position, the return solenoid valve and the parking solenoid valve are simultaneously de-energized, preventing irreparable damage to the hydraulic system and the entire vehicle from momentary parking.

[0008] Furthermore, a time adjustment switch is also included. The parking switch, the inductive switch, and the time adjustment switch are arranged in parallel between the controller and the battery. The time adjustment switch is configured to adjust the delay threshold of the controller. Through the above settings, the time adjustment switch allows the operator to flexibly set the threshold for determining the seat vacancy period according to working conditions, thereby adapting to different work rhythms and safety level requirements. When the duration of seat vacancy is greater than or equal to the delay threshold, it indicates that the driver has left the seat; when the duration of seat vacancy is less than the delay threshold, it is determined that the driver has not left the seat.

[0009] Furthermore, the time adjustment switch is a rocker switch. With the above design, the rocker switch has a compact structure and intuitive operation, allowing the driver to quickly identify the gear and make precise adjustments under bumpy conditions.

[0010] Furthermore, it also includes a battery relay and a start switch connected to the battery, an emergency stop switch connected to the battery relay and the start switch, and an engine electronic controller connected to the emergency stop switch. The emergency stop switch has a first normally closed switch and a second normally closed switch, which are connected in series between the start switch and the engine electronic controller. Through the above configuration, the two normally closed switches of the emergency stop switch are connected in series between the start switch and the engine electronic controller, forming a double-redundant safety circuit. If either of the two normally closed switches is disconnected, the power supply to the engine electronic controller is cut off, causing the engine to shut down and the vehicle to stop, thus adapting to the usage scenarios of the road roller with two driving control positions.

[0011] Furthermore, the system also includes a display. The emergency stop switch has a first normally open switch and a second normally open switch. The first normally open switch and the second normally open switch are connected in parallel between the battery relay and the display. The first normally open switch is linked with the first normally closed switch, and the second normally open switch is linked with the second normally closed switch. With the above configuration, when the emergency stop switch is pressed, either of the two sets of normally open contacts closes, ensuring that the display is always powered, able to display the current parking status, and issue an alarm for reminder.

[0012] To improve or solve the technical problem in existing technologies where, when a driver leaves the vehicle in an emergency, the vehicle remains in a slow-moving state, potentially causing personal injury to surrounding workers, this invention provides a safety control method for construction machinery. The safety control method uses the safety control system for construction machinery as described in any one of claims 1-6. The safety control system includes a battery, a pump-back solenoid valve, a parking solenoid valve, a parking switch, and a proximity switch. The safety control method includes: acquiring the parking state of the parking switch; controlling the proximity switch to detect the seat state; controlling the pump-back solenoid valve and the parking solenoid valve to be energized based on the parking state and the seat state; when the parking switch is in the parking position and / or the seat is unoccupied, controlling the pump-back solenoid valve and the parking solenoid valve to be de-energized and park; when the parking switch is in the non-parking position and the seat is occupied, controlling the pump-back solenoid valve and the parking solenoid valve to be energized. Through the above-described configuration, the safety control method for engineering machinery of this invention achieves intelligent closed-loop control of vehicle dynamic parking by using dual logical judgments based on the parking switch position and seat status. When either condition is met (parking position activated or driver leaves seat), the system immediately cuts off the power supply to the pump return solenoid valve and the parking solenoid valve, forcing the vehicle into parking mode. Only when both conditions are not met does the system allow normal driving, thus avoiding safety hazards caused by misoperation and maximizing the personal safety of people around the vehicle.

[0013] Furthermore, the step of controlling the sensor switch to detect the seat's state includes: determining whether the seat is in an vacant state based on the sensor switch's detection result; when the seat is in an vacant state, determining whether the seat is unoccupied; and when the seat is not vacant, determining that the seat is in a seated state. Through the above settings, the sensor switch's contact information is first used to determine whether the seat is vacant. If the seat is vacant, it is further determined whether the seat is actually unoccupied or falsely triggered due to bumps or other reasons, thus avoiding irreparable damage to the hydraulic system and the entire vehicle caused by momentary parking.

[0014] Furthermore, the step of determining whether the seat is in an unoccupied state when the seat is in an vacant state includes: comparing the duration of the vacant state with a delay threshold; determining that the seat is in an unoccupied state when the duration of the vacant state is greater than or equal to the delay threshold; and determining that the seat is in a occupied state when the duration of the vacant state is less than the delay threshold. Through the above settings, a time threshold determination mechanism is introduced to effectively avoid accidental parking caused by brief periods of absence from the seat (such as adjusting posture, retrieving items, or experiencing bumps), and to prevent irreparable damage to the hydraulic system and the entire vehicle caused by momentary parking during high-speed operation.

[0015] Furthermore, it also includes controlling the emergency stop switch to cut off the engine electronic controller. With the above settings, when the emergency stop switch is triggered, it can immediately cut off the power signal to the engine electronic controller, causing the engine to shut off and the vehicle to stop without power. Attached Figure Description

[0016] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which: Figure 1 This is a schematic diagram of an embodiment of the safety control system of the present invention for engineering machinery; Figure 2 This is a schematic diagram of an embodiment of the safety control method for engineering machinery according to the present invention.

[0017] List of reference numerals in the attached diagram: 1. Battery; 2. Main power switch; 3. Battery relay; 4. Start switch; 5. Parking switch; 6. Inductive switch; 7. Time adjustment switch; 8. Controller; 9. Pump return solenoid valve; 10. Parking solenoid valve; 11. Emergency stop switch; 12. Engine electronic controller; 13. Display; 14. First normally open switch; 15. Second normally open switch; 16. First normally closed switch; 17. Second normally closed switch. Detailed Implementation

[0018] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0019] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] A pneumatic tire roller is a type of road construction machinery that uses multiple inflatable rubber tires to compact road surfaces. It typically has 3-5 tires at the front and 4-6 tires at the rear. Suitable for compacting base layers, subbase layers, and asphalt surface layers of various materials, it is an indispensable compaction machine in highway, municipal, and national defense construction. This application uses a pneumatic tire roller as an example for illustration; its safety control system is also applicable to other construction machinery that requires consideration of parking braking safety, such as double-drum rollers.

[0022] At construction sites, all tasks are busy and the pace is fast. The following situation may occur: a driver, while driving, suddenly has an emergency and needs to get out of the vehicle. However, due to negligence, the engine may not be turned off, the gear lever may not have been returned to the neutral position, or it may not have been fully returned. Simultaneously, the parking solenoid valve 10 may not be engaged (i.e., the parking switch 5 is not activated and not in the parking position, and the parking solenoid valve 10 is not in operation). If the driver urgently leaves the vehicle while it is still moving slowly, and there are still workers nearby, this could potentially cause personal injury.

[0023] To improve or solve the technical problem in existing technologies where the vehicle remains in a slow-moving state even when the driver leaves the vehicle in an emergency, potentially causing personal injury to surrounding personnel, this invention provides a safety control system for construction machinery. The safety control system includes: a battery 1, a return-to-center solenoid valve 9, and a parking solenoid valve 10; it also includes: a parking switch 5 connected to the return-to-center solenoid valve 9 and the parking solenoid valve 10; and a proximity switch 6 adapted to be installed on the seat of the construction machinery and connected to the return-to-center solenoid valve 9 and the parking solenoid valve 10; the return-to-center solenoid valve 9 and the parking solenoid valve 10 are configured to de-energize and park the vehicle when the parking switch 5 is in the parking position and / or the proximity switch 6 detects that the seat has been removed.

[0024] Figure 1 This is a schematic diagram of an embodiment of the safety control system of the present invention for engineering machinery. (See diagram below.) Figure 1 As shown, in one or more embodiments, the safety control system for engineering machinery of the present invention includes a battery 1, a pump return solenoid valve 9, a parking solenoid valve 10, a parking switch 5, and an inductive switch 6.

[0025] See also Figure 1 The battery 1 provides power to the entire vehicle. In one or more embodiments, a main power switch 2 is connected to the rear of the battery 1. The main power switch 2 is responsible for controlling the on / off state of the entire circuit, ensuring that current flows when needed and is cut off when not needed, thereby protecting the safety of equipment and personnel. The main power switch 2 is designed and installed in the maintenance window above the rear wheel on the right side of the vehicle body for easy operation. Furthermore, the main power switch 2 is connected to a battery relay 3, and the battery relay 3 is connected to a start switch 4. The battery relay 3 is a normally open relay; when the main power switch 2 is closed, the current output from the battery 1 flows through the main power switch 2 into the start switch 4, and then from the start switch 4 to the coil of the battery relay 3, causing the battery relay 3 to switch from a normally open state to a closed state, allowing the current output from the battery 1 to be transmitted outward through the battery relay 3. It can be understood that the battery relay 3 is an electrical control device, which is an electrical device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity reaches a specified requirement, and has an interactive relationship between the control system and the controlled system. It is commonly used in automated control circuits, and is actually an automatic switch that uses a small current to control a large current operation. Therefore, the battery relay 3 plays the roles of automatic adjustment, safety protection, and circuit switching in the circuit. The battery relay 3 is equipped with a first output line and a second output line. The first output line is branched into a first branch and a second branch. The first branch is connected to the emergency stop switch 11, and the second branch is connected to the parking switch 5 and the inductive switch 6.

[0026] See also Figure 1In one or more embodiments, the first branch road branches into a first fork and a second fork. The emergency stop switch 11 has a first normally open switch 14 and a second normally open switch 15, which are arranged in parallel. The first fork connects to the first normally open switch 14, and the second fork connects to the second normally open switch 15. Further, the lines of the first normally open switch 14 and the second normally open switch 15 converge and are connected to a display 13. For example, the road roller has two driver's seats, and the first normally open switch 14 and the second normally open switch 15 correspond to the two driver's seats respectively. When the emergency stop switch 11 of either driver's seat is pressed, current can be transmitted to the display 13 along the normally open switch. It is understood that the display 13 is an output device, a tool that displays certain electronic documents on a screen through a specific transmission device. The display 13 mentioned in this application is a device used to directly display various parameters, status, and other information of the engine. The display 13 is equipped with a parking indicator light and an alarm buzzer to facilitate the driver's observation of the vehicle's parking status information. Specifically, the display 13 is electrically connected to the parking switch 5 and is used to display the status of the parking switch 5. When the parking switch 5 is in the parking position, the alarm buzzer sounds to remind the driver that the vehicle is in a parking brake state.

[0027] See also Figure 1 The start switch 4 is an electrical switch that controls the vehicle's power on / off, engine start, and shutdown. In one or more embodiments, the start switch 4 has a third output line and a fourth output line. The third output line is connected to the battery relay 3, which closes when energized. The emergency stop switch 11 has a first normally closed switch 16 and a second normally closed switch 17, which are connected in series. The first normally closed switch 16 is linked to the first normally open switch 14, and the second normally closed switch 17 is linked to the second normally open switch 15. When the first normally closed switch 16 is open, the first normally open switch 14 is closed; when the first normally closed switch 16 is closed, the first normally open switch 14 is open. Similarly, the second normally closed switch 17 is mechanically linked to the second normally open switch 15. Furthermore, the fourth output line connected to the first normally closed switch 16 and the second normally open switch 17 is connected to the engine electronic controller 12. When the power-on signal of the engine electronic controller 12 is cut off, the engine shuts off.

[0028] See also Figure 1In one or more embodiments, the second output line is branched into a third branch and a fourth branch. The third branch is connected to the parking switch 5, and the fourth branch is connected to the inductive switch 6. It is understood that the parking switch 5 has two states, controlling the on and off states of the third branch. The inductive switch 6 is an electronic component that triggers the circuit to open or close by sensing changes in external physical quantities (such as proximity, liquid level, temperature, etc.). Its core principle is to utilize mechanisms such as electromagnetic induction, capacitance change, or photoelectric effect to output a switch signal when a preset threshold is detected. The inductive switch 6 mentioned in this article is actually a mechanical limit switch, providing a switching signal with two states, controlling the on and off states of the circuit. The inductive switch 6 is actually installed under the seat, sensing whether the driver is properly seated. After the driver leaves the seat, the inductive switch 6 changes from normally open to normally closed, or from normally closed to normally open. Furthermore, the parking switch 5 and the inductive switch 6 are connected to a controller 8. That is, the third and fourth branches merge and are connected to the controller 8. The signal change of the induction switch 6 is instantaneous, without any delay. The controller 8 can delay the output of the signal transmitted by the induction switch 6. The controller 8 is connected to the display 13, thereby transmitting the parking position of the parking switch 5 to the display 13. Furthermore, the second output line is branched into a fifth branch, on which a time adjustment switch 7 is connected. The time adjustment switch 7 is used to adjust the delay threshold of the controller 8's delayed output. Specifically, the time adjustment switch 7 is a rocker switch with three self-reset states, controlling the on / off state of the circuit. During operation, it is used to adjust the output signal of the controller 8, that is, to adjust the duration of the output signal, quickly adjusting the time parameters according to the actual operating conditions of the vehicle. Furthermore, the controller 8 determines whether the seat is in an unoccupied or occupied state based on the state of the induction switch 6. Specifically, when the state of the sensor switch 6 changes, indicating that the seat has entered an vacant state, the controller 8 compares the duration of the vacant state with a delay threshold. If the duration of the vacant state is greater than or equal to the delay threshold, the seat is determined to be in an unoccupied state; if the duration of the vacant state is less than the delay threshold, the seat is determined to be still in an occupied state. This delay threshold is set by the time adjustment switch 7 and is adjustable from 0.1 seconds to 10 seconds.

[0029] See also Figure 1 In one or more embodiments, the return solenoid valve 9 and the parking solenoid valve 10 are arranged in parallel and are both connected to the controller 8. When the return solenoid valve 9 is energized, the engine power is output normally; when the return solenoid valve 9 is de-energized, the engine power is cut off. When the parking solenoid valve 10 is energized, the vehicle is not parked; when the parking solenoid valve 10 is de-energized, the vehicle is parked.

[0030] The working principle of this invention is as follows: First, close the main power switch 2, then climb the ladder on the left side of the vehicle body to the driver's cab; first check whether the gear shift lever is in the neutral position, whether the parking switch 5 is in the parking position, and whether the emergency stop switch 11 is in the open position. After these three checks are correct, turn the start switch 4 to the ON position. The battery relay 3 coil is energized and the contacts close, the vehicle is powered on, and the display 13 lights up. The parking status indicator light on the display 13 is lit, indicating that the vehicle is in the parking state. The separately designed neutral indicator light is lit, indicating that the gear shift lever is in the neutral position. At this time, the vehicle can be started normally. When the driver is sitting normally in the seat, the contact state of the sensor switch 6 changes, and the signal is input to the controller 8. The controller 8 recognizes that the seat is in the seated state, and the driver changes the state of the parking switch 5 from the parking position to the non-parking position. The controller 8 outputs a control signal to the parking solenoid valve 10 and the pump return solenoid valve 9, energizing both solenoid valves. The parking solenoid valve 10 is not in parking position, the engine outputs power normally, and the vehicle gear shift lever is pushed forward or pulled backward, causing the vehicle to start moving back and forth.

[0031] When the vehicle completes its parking or temporary parking, and the driver leaves the seat, the contact state of the sensor switch 6 changes. After a certain delay, the controller 8 recognizes that the seat is unoccupied. Alternatively, if the driver presses the parking switch 5, the controller 8 receives the parking command and outputs a control signal to the parking solenoid valve 10 and the pump return solenoid valve, de-energizing both valves, cutting off engine power output, and parking the vehicle. The combined use of the parking switch 5 and the sensor switch 6 increases the multiple settings for vehicle braking, maximizing the safety of people around the vehicle. When the emergency stop switch 11 is pressed, it ensures that in an emergency, the power signal to the engine electronic controller 12 is cut off, causing the engine to shut off and the vehicle to stop without power.

[0032] To improve or solve the technical problem in existing technologies where, when a driver urgently leaves the vehicle, the vehicle may still be in a slow-moving state, potentially causing personal injury to surrounding workers, this invention provides a safety control method for construction machinery. This safety control method uses the aforementioned safety control system for construction machinery. The installation and control system includes a battery 1, a pump return solenoid valve 9, a parking solenoid valve 10, a parking switch 5, and a proximity switch 6. The safety control method includes: Step S1: Obtain the parking status of the parking switch 5. Specifically, the parking switch 5 has two states: parking and non-parking. In the parking position, the vehicle stops moving; in the non-parking position, the vehicle can move. The parking switch 5 is connected to a controller 8, which receives the electrical signal from the parking switch 5 in real time, thereby controlling the on / off state of the parking solenoid valve 10 and the pump return solenoid valve 9.

[0033] Step S2: Control the sensor switch 6 to detect the seat status; the sensor switch 6 collects physical signals in real time indicating whether the driver is seated and transmits the status information to the controller 8. Specifically, the seat has an empty state and a non-empty state. The empty state means that the sensor switch 6 does not detect downward pressure on the seat; the non-empty state means that the driver is seated normally and applying some downward pressure to the seat. The empty state can be further divided into an unoccupied state and a seated state. The unoccupied state means that the driver is not sitting in the seat, and the seated state means that although the driver is seated, their body is lifted off the seat due to a sudden situation. It is understandable that the roads at actual construction sites are not always flat; due to road bumps, vibrations, etc., the driver's body may momentarily leave the seat. Since the change in the contact state of the sensor switch 6 is instantaneous, this results in the driver being seated but still in an empty state. The non-empty state corresponds to the seated state within the empty state. Further, step S2 includes: Step S21: Based on the detection result of the sensor switch 6, determine whether the seat is in an vacant state. For example, when the seat is vacant, the sensor switch 6 is normally closed; when the seat is not vacant, the sensor switch 6 is normally open. Therefore, by obtaining the on / off state of the sensor switch 6, it is possible to determine whether the seat is vacant.

[0034] Step S22: When the seat is in an empty state, determine whether the seat is in a vacant state. Further determine whether the vacant state is due to the driver leaving or due to a sudden situation that caused the driver's body to momentarily leave the seat.

[0035] Step S23: When the seat is not empty, determine that the seat is in a seated state, that is, the driver is sitting normally.

[0036] Furthermore, step S22 includes: Step S221: Compare the duration of the idle state with the delay threshold. Specifically, the duration of the idle state refers to the time from when the sensor switch 6 changes contact and the seat enters the idle state until the next change of the sensor switch 6 contact; the delay threshold is preset in the controller 8. The delay threshold can be adjusted as needed, ranging from 0.1 seconds to 10 seconds. For example, the delay threshold is 5 seconds.

[0037] Step S222: When the duration of the vacant state is greater than or equal to the delay threshold, it is determined that the seat is in an unoccupied state. The duration of the vacant state being greater than or equal to the delay threshold indicates that the driver has left the seat for more than the set time. The controller 8 determines this as a genuine unoccupied situation and controls the parking solenoid valve 10 and the return solenoid valve 9 to operate. That is, the controller 8 delays the on / off signal of the sensor switch 6 by the delay threshold before transmitting it to the parking solenoid valve 10 and the return solenoid valve 9.

[0038] Step S223: When the duration of the vacant state is less than the delay threshold, it is determined that the seat is in a seated state. If the duration of the vacant state is less than the delay threshold, it indicates that the driver's body momentarily leaving the seat is a normal response to bumps. The controller 8 will block this momentary signal and will not trigger the parking action.

[0039] Step S3: Control the power supply of the pump return solenoid valve 9 and the parking solenoid valve 10 according to the parking status and the seat status.

[0040] Step S4: When the parking switch 5 is in the parking position and / or the seat is unoccupied, the controller de-energizes the pump return solenoid valve 9 and the parking solenoid valve 10 to stop the vehicle from moving. When the parking switch 5 is in the parking position and the seat is unoccupied, if either condition is triggered, the controller 8 immediately de-energizes the parking solenoid valve 10 and the pump return solenoid valve 9. The parking solenoid valve 10 is de-energized to stop the vehicle from moving, and the pump return solenoid valve 9 is de-energized to cut off the engine power output.

[0041] Step S5: When the parking switch 5 is in the non-parking position and / or the seat is in the seated position, the control pump return solenoid valve 9 and the parking solenoid valve 10 are energized. When the parking switch 5 is in the non-parking position and the seat is in the seated position, both conditions are met simultaneously. The controller 8 controls the parking solenoid valve 10 and the pump return solenoid valve 9 to be energized. The parking solenoid valve 10 is energized to release the parking position, and the pump return solenoid valve 9 is energized, allowing engine power to be output.

[0042] Step S6: Control the emergency stop switch 11 to disconnect the engine electronic controller 12. After the emergency stop switch 11 is triggered, the engine electronic controller 12 immediately terminates the fuel injection and ignition commands, and the power output is completely interrupted, causing the engine to stop.

[0043] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A safety control system for engineering machinery, comprising a battery (1), a pump return solenoid valve (9), and a parking solenoid valve (10); characterized in that, Also includes: The parking switch (5) is connected to the pump return solenoid valve (9) and the parking solenoid valve (10); A proximity switch (6) is adapted to be installed on the seat of the construction machinery and connected to the pump return solenoid valve (9) and the parking solenoid valve (10); the pump return solenoid valve (9) and the parking solenoid valve (10) are configured to de-energize the parking mechanism when the parking switch (5) is in the parking position and / or the proximity switch (6) detects that the seat is unoccupied.

2. The safety control system for engineering machinery according to claim 1, characterized in that, It also includes a controller (8) connected to the pump return solenoid valve (9) and the parking solenoid valve (10), and the parking switch (5) and the inductive switch (6) are arranged in parallel between the controller (8) and the battery (1); the controller (8) is configured to determine the state of the seat based on the time the seat is vacant, and to control the pump return solenoid valve (9) and the parking solenoid valve (10) to de-energize and park the vehicle when the parking switch (5) is in the parking position and / or the seat is in the unoccupied state.

3. The safety control system for engineering machinery according to claim 2, characterized in that, It also includes a time adjustment switch (7), the parking switch (5), the induction switch (6), and the time adjustment switch (7) are arranged in parallel between the controller (8) and the battery (1), and the time adjustment switch (7) is configured to adjust the delay threshold of the controller (8).

4. The safety control system for engineering machinery according to claim 3, characterized in that, The time adjustment switch (7) is a rocker switch.

5. The safety control system for engineering machinery according to claim 1, characterized in that, It also includes a battery relay (3) and a start switch (4) connected to the battery (1), an emergency stop switch (11) connected to the battery relay (3) and the start switch (4), and an engine electronic controller (12) connected to the emergency stop switch (11); the emergency stop switch (11) has a first normally closed switch (16) and a second normally closed switch (17), the first normally closed switch (16) and the second normally closed switch (17) are arranged in series between the start switch (4) and the engine electronic controller (12).

6. The safety control system for engineering machinery according to claim 5, characterized in that, It also includes a display (13), and the emergency stop switch (11) has a first normally open switch (14) and a second normally open switch (15). The first normally open switch (14) and the second normally open switch (15) are arranged in parallel between the battery relay (3) and the display (13). The first normally open switch (14) is linked with the first normally closed switch (16), and the second normally open switch (15) is linked with the second normally closed switch (17).

7. A safety control method for engineering machinery, characterized in that, The safety control system for engineering machinery according to any one of claims 1-6 includes a battery (1), a pump return solenoid valve (9), a parking solenoid valve (10), a parking switch (5), and a proximity switch (6); the safety control method includes: Obtain the parking status of the parking switch (5); The sensor switch (6) is controlled to detect the state of the seat; The power supply to the pump return solenoid valve (9) and the parking solenoid valve (10) is controlled according to the parking status and the seat status. When the parking switch (5) is in the parking position and / or the seat is in the unoccupied state, the pump return solenoid valve (9) and the parking solenoid valve (10) are de-energized to park the vehicle. When the parking switch (5) is in the non-parking position and the seat is in the seated position, the pump return solenoid valve (9) and the parking solenoid valve (10) are energized.

8. The safety control method for engineering machinery according to claim 7, characterized in that, The step of controlling the sensor switch (6) to detect the state of the seat includes: Based on the detection result of the sensor switch (6), determine whether the seat is in an empty state; When the seat is in an unoccupied state, determine whether the seat is in a state of being unoccupied; When the seat is not empty, it is determined that the seat is in a sitting state.

9. The safety control method for engineering machinery according to claim 8, characterized in that, The step of determining whether the seat is unoccupied when the seat is in an vacant state includes: Compare the duration of the idle state with the delay threshold; When the time of the vacancy is greater than or equal to the delay threshold, it is determined that the seat is in a state of being unoccupied; When the time of the vacancy is less than the delay threshold, the seat is determined to be in a seated state.

10. The safety control method for engineering machinery according to claim 7, characterized in that, It also includes controlling the emergency stop switch (11) to disconnect the engine electronic controller (12).

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