Automatic parking system and method for dump truck

Abstract

The present invention discloses an automatic parking system and method for a dump truck, and relates to the technical field of automatic parking. The automatic parking system comprises: a cargo box height sensor, for detecting a height signal of a cargo box of the dump truck; a pressure sensor, for detecting a pressure signal of a handbrake pipeline of the dump truck; a vehicle protection controller, for obtaining a pipeline pressure according to the pressure signal, and generating a parking control signal when the pipeline pressure is less than a set pressure threshold and the height signal is greater than a preset height threshold; and a parking solenoid valve, for closing the parking hydraulic pipeline of the dump truck to realize automatic parking when receiving the parking control signal. The present invention can ensure the safe operation of the dump truck, improve the safety of the dump truck, and reduce the occurrence of safety accidents.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic parking, and in particular to an automatic parking system and method for a dump truck. Background Art

[0002] With the continuous development of the mining industry, the use of underground auxiliary transport vehicles has increased, and transportation safety has become a major concern in the industry. Mines face a huge demand for the transport of various materials underground, and trackless auxiliary transport equipment in coal mines is a key way to meet this demand. Underground explosion-proof dump trucks, due to their maneuverability and adaptability, are widely used in underground coal mine transportation, especially in the transportation of bulk materials such as earth and rock. These trucks unload automatically by raising their unloading cargo box. However, before unloading, the dump truck must be stopped, and this requires high safety performance. If drivers lack safety awareness or are negligent, and the truck continues to move after unloading without lowering the cargo box, accidents can easily occur, resulting in casualties and property damage. Therefore, improving the safety of underground auxiliary transport vehicles is crucial to addressing the safety issues caused by underground explosion-proof dump trucks that are driven without lowering the cargo box. Summary of the Invention

[0003] The purpose of the present invention is to provide an automatic parking system and method for a dump truck, which can ensure the safe operation of the dump truck, improve the safety of the dump truck, and reduce the occurrence of safety accidents.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] An automatic parking system for a dump truck, comprising:

[0006] A pressure sensor is connected to the handbrake pipeline of the dump truck and is used to detect a pressure signal;

[0007] A cargo box height sensor is connected to the cargo box of the dump truck and is used to detect a height signal of the cargo box;

[0008] a vehicle protection controller connected to the cargo box height sensor and the pressure sensor, configured to obtain a line pressure based on the pressure signal and generate a parking control signal when the line pressure is less than a set pressure threshold and the height signal is greater than a preset height threshold;

[0009] The parking solenoid valve is connected to the parking hydraulic pipeline of the dump truck and is used to close the parking hydraulic pipeline to achieve automatic parking when receiving the parking control signal.

[0010] Optionally, the vehicle protection controller is further configured to:

[0011] When the pipeline pressure is greater than the set pressure threshold, generating a first control signal;

[0012] When the pipeline pressure is less than the set pressure threshold and the height signal is less than or equal to the preset height threshold, generating a second control signal;

[0013] The parking solenoid valve is also used for:

[0014] When the first control signal or the second control signal is received, the parking hydraulic circuit is opened to release the automatic parking.

[0015] Optionally, the automatic parking system further includes:

[0016] The cargo box lifting controller is arranged in the cab of the dump truck and is connected to the vehicle protection controller. It is used to control the lifting or lowering of the cargo box according to the driver's operating instructions and generate corresponding action signals.

[0017] Optionally, the vehicle protection controller is further configured to:

[0018] generating a third control signal when the pipeline pressure is less than the set pressure threshold, the height signal is greater than the preset height threshold, and the action signal is detected;

[0019] The parking solenoid valve is also used for:

[0020] When the third control signal is received, the parking hydraulic circuit is opened to release the automatic parking.

[0021] Optionally, the automatic parking system for the dump truck further includes:

[0022] The vehicle display is connected to the vehicle protection controller and is used to display the parking status of the dump truck; the parking status includes: automatic parking status and automatic parking release status.

[0023] Optionally, the automatic parking system for the dump truck further includes:

[0024] A voice prompting device is connected to the vehicle protection controller and is used for providing voice prompts.

[0025] To achieve the above object, the present invention also provides the following solution:

[0026] A method for automatically parking a dump truck, the method being applied to the automatic parking system for the dump truck; the method comprising:

[0027] Obtain the height signal of the dump truck's cargo box and the pressure signal of the handbrake pipeline;

[0028] obtaining the pipeline pressure according to the pressure signal;

[0029] Determining whether parking conditions are met; the parking conditions include: the line pressure is less than a set pressure threshold and the height signal is greater than a preset height threshold;

[0030] If the parking condition is met, a parking control signal is generated;

[0031] The parking hydraulic circuit is controlled to close according to the parking control signal to achieve automatic parking.

[0032] Optionally, the automatic parking method for a dump truck further includes:

[0033] Determining whether a first parking release condition is satisfied; the first parking release condition includes: the line pressure is greater than or equal to the set pressure threshold, or the line pressure is less than the set pressure threshold and the height signal is less than or equal to the preset height threshold;

[0034] If the first parking release condition is met, a first parking release signal is generated;

[0035] The parking hydraulic circuit is controlled to open according to the first parking release signal to achieve automatic parking release.

[0036] Optionally, the automatic parking method for a dump truck further includes:

[0037] Acquiring an action signal generated according to a driver's operating instruction;

[0038] Determining whether a parking release condition is satisfied; the parking release condition includes: the line pressure is less than the set pressure threshold, the height signal is greater than the preset height threshold, and the action signal is detected;

[0039] If the parking release condition is met, a parking release signal is generated;

[0040] The parking hydraulic circuit is controlled to open according to the parking release signal to realize automatic parking release.

[0041] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0042] The present invention discloses an automatic parking system and method for dump trucks. A vehicle protection controller sequentially determines a height signal detected by a cargo box height sensor and a pressure signal detected by a pressure sensor to obtain a parking control signal. In response to the parking control signal, a parking solenoid valve closes the parking hydraulic line to achieve automatic parking. Compared to existing technologies, the present invention's two-step determination process can prevent safety accidents caused by the dump truck continuing to drive when the cargo box has not yet been lowered, thereby ensuring the safe operation of the dump truck and improving its safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 This is a connection diagram of the automatic parking system for a dump truck of the present invention;

[0045] Figure 2 This is a schematic diagram of the process flow of the automatic parking system for a dump truck of the present invention;

[0046] Figure 3 This is a physical structural diagram of the automatic parking system for a dump truck of the present invention.

[0047] Explanation of symbols:

[0048] Pressure sensor-1, cargo box height sensor-2, vehicle protection controller-3, parking solenoid valve-4, cargo box lift controller-5, vehicle display-6, voice reminder device-7, cargo box-8, cargo box lift rod-9. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] The purpose of the present invention is to provide an automatic parking system and method for a dump truck, which determines the status of the dump truck through a vehicle protection controller and generates a control signal to achieve automatic parking, thereby ensuring the safe operation of the dump truck, improving the safety of the dump truck, and reducing the occurrence of safety accidents.

[0051] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] like Figure 1 As shown, the present invention provides an automatic parking system for a dump truck, which includes a pressure sensor 1, a cargo box height sensor 2, a vehicle protection controller 3, and a parking solenoid valve 4.

[0053] The pressure sensor 1 is connected to the handbrake pipeline of the dump truck; the pressure sensor 1 is used to detect the pressure signal.

[0054] The pressure sensor 1 outputs a switching signal by determining the magnitude of its actuation point and the pressure level in the dump truck's handbrake line. For example, the actuation point of pressure sensor 1 is Δp1, where Δp1 represents the pressure generated when the handbrake line is in a closed state during normal use. When pressure sensor 1 detects the handbrake line pressure as p1, if p1 > Δp1, the contact state of pressure sensor 1 switches from open to closed, energizing pressure sensor 1 and generating a corresponding pressure signal. If p1 < Δp1, the contact state of pressure sensor 1 switches from closed to open, disconnecting the contact and no longer generating a pressure signal.

[0055] The cargo box height sensor 2 is connected to the cargo box 8 of the dump truck; the cargo box height sensor 2 is used to detect the height signal of the cargo box 8.

[0056] like Figure 3 As shown, the cargo box height sensor 2 can detect whether the cargo box 8 of the dump truck has landed in place through a switch signal; when the cargo box 8 has landed in place, the switch contact state of the cargo box height sensor 2 is switched from an open state to a closed state, and the cargo box height sensor 2 is energized and sends a height signal; after the cargo box 8 is raised, the contact state is switched from a closed state to an open state, the cargo box height sensor 2 is disconnected, and the operation is terminated.

[0057] The vehicle protection controller 3 is connected to the cargo box height sensor 2 and the pressure sensor 1; the vehicle protection controller 3 is used to obtain the pipeline pressure according to the pressure signal, and generate a parking control signal when the pipeline pressure is less than the set pressure threshold and the height signal is greater than the preset height threshold.

[0058] The vehicle protection controller 3 can collect the signals generated by the contact closure of the cargo box height sensor 2 and the pressure sensor 1, and perform judgment and processing on the signals.

[0059] The parking solenoid valve 4 is connected to the parking hydraulic pipeline of the dump truck; the parking solenoid valve 4 is used to close the parking hydraulic pipeline to achieve automatic parking when receiving the parking control signal.

[0060] The parking solenoid valve 4 may be an electrically controlled hydraulic valve. When the parking solenoid valve 4 receives a parking control signal, it is energized, switching from a closed state to an open state, closing the parking hydraulic line, and implementing automatic parking. When the parking solenoid valve 4 does not receive a parking control signal, it is de-energized, switching from an open state to a closed state, opening the parking hydraulic line, and releasing the automatic parking function.

[0061] Optionally, the pressure sensor 1, the cargo box height sensor 2, the vehicle protection controller 3 and the parking solenoid valve 4 are all of the mining intrinsically safe type, which is an explosion-proof type of electrical equipment used in engineering environments such as underground mines.

[0062] The automatic parking system of the present invention can not only realize automatic parking of dump trucks, but also release the automatic parking of dump trucks. To achieve the release of automatic parking, the vehicle protection controller 3 is further configured to: generate a first control signal when the pipeline pressure is greater than or equal to the set pressure threshold; and generate a second control signal when the pipeline pressure is less than the set pressure threshold and the height signal is less than or equal to the preset height threshold.

[0063] The parking solenoid valve 4 is further configured to open the parking hydraulic circuit and release automatic parking when receiving the first control signal or the second control signal.

[0064] The vehicle protection controller 3 uses the pressure sensor 1 and the cargo box height sensor 2 to first determine the closed state of the handbrake pipeline of the dump truck based on the pressure signal, and then determines whether the cargo box 8 of the dump truck has landed in place based on the height signal, thereby realizing the status judgment of engineering transport vehicles such as underground and ensuring the safe progress of the project.

[0065] Considering that in the actual project implementation, the dump truck needs to keep moving at a certain speed while unloading, so that the transported materials can be unloaded at different places. Figure 1 The automatic parking system for the dump truck of the present invention further includes: a cargo box lifting controller 5.

[0066] The cargo box lifting controller 5 is arranged in the cab of the dump truck and is connected to the vehicle protection controller 3; the cargo box lifting controller 5 is used to control the lifting or lowering of the cargo box according to the driver's operating instructions, and generate corresponding action signals.

[0067] The cargo box lifting controller 5 can be a function button, the explosion-proof form of the function button is a mining intrinsically safe type, and the output is a switch signal. Figure 3 In the cab of the dump truck, when the driver presses the function button, the contact state of the function button switches from an open state to a closed state, the function button is energized, and the cargo box 8 is controlled to rise or fall through the cargo box lifting rod 9; when released, the function button state is restored from a closed state to an open state, the function button loses power, the cargo box 8 stops lifting and returns to a stationary state.

[0068] Based on the above embodiment, the automatic parking system of the present invention further needs to integrate the role played by the cargo box lift controller in automatic parking, thereby further improving the automatic parking judgment of the present invention. Therefore, the vehicle protection controller 3 is further configured to: generate a third control signal when the line pressure is less than the set pressure threshold, the height signal is greater than the preset height threshold, and the action signal is detected; and generate a fourth control signal when the line pressure is less than the set pressure threshold, the height signal is greater than the preset height threshold, and the action signal is not detected.

[0069] The parking solenoid valve 4 is further configured to: open the parking hydraulic circuit to release automatic parking upon receiving the third control signal; and close the parking hydraulic circuit to perform automatic parking upon receiving the fourth control signal.

[0070] In actual application scenarios such as underground engineering, the environment conditions of the dump truck are relatively harsh, and the driver may not be able to make a good judgment on the status of the dump truck. In order to improve the transportation efficiency of the dump truck and reduce unnecessary time consumption, the dump truck automatic parking system also includes: a vehicle display 6.

[0071] The whole vehicle display 6 is connected to the vehicle protection controller 3; the whole vehicle display 6 is used to display the parking status of the dump truck.

[0072] The parking state includes: an automatic parking state and an automatic parking release state.

[0073] The vehicle display 6 generates a parking control signal according to the vehicle protection controller.

[0074] Specifically, when the pipeline pressure is less than the set pressure threshold and the height signal is greater than the preset height threshold, the parking solenoid valve 4 generates a parking control signal according to the vehicle protection controller 3, closing the parking hydraulic pipeline to achieve automatic parking. At the same time, the vehicle display 6 is used to display the parking state of the dump truck as an automatic parking state according to the parking control signal.

[0075] The vehicle display 6 is also used to display the parking state of the dump truck as the automatic parking released state when the parking solenoid valve 4 opens the parking hydraulic pipeline and releases the automatic parking according to the first control signal, the second control signal and the third control signal generated by the vehicle protection controller 3.

[0076] Similarly, the vehicle display 6 is also used to display the parking state of the dump truck as automatic parking state when the parking solenoid valve 4 closes the parking hydraulic pipeline and performs automatic parking according to the fourth control signal generated by the vehicle protection controller 3.

[0077] In practical applications, the driver may drive the dump truck without confirming the parking status of the dump truck through the vehicle display due to environmental reasons or other factors, which is dangerous. Therefore, other means are needed to make the driver confirm the parking status of the dump truck. The automatic parking system for dump trucks also includes: a voice reminder device 7.

[0078] The voice reminder device 7 is connected to the vehicle protection controller 3; the voice reminder device 7 is used to provide voice reminders.

[0079] The voice reminder device 7 is used to generate a parking control signal according to the vehicle protection controller 3 when the pipeline pressure is lower than the set pressure threshold and the height signal is greater than the preset height threshold, closing the parking hydraulic pipeline to achieve automatic parking and giving a voice prompt, such as: "Please note that the cargo box has not fallen", giving the driver sufficient auditory warning.

[0080] The voice prompting device 7 is used for the parking solenoid valve 4 to close the parking hydraulic pipeline according to the fourth control signal, and to perform automatic parking while giving a voice prompt.

[0081] like Figure 2 As shown, using the cargo box lift controller 5 as an example, when a driver or passenger enters a dump truck, closes the door, powers on, completes a self-test, and starts the vehicle, the vehicle protection controller 3 collects signals from the pressure sensor 1, cargo box height sensor 2, and the function button. When the parking brake is applied, the parking line pressure is zero; when the parking brake is released, the parking line pressure is p2.

[0082] When the parking brake is applied, the parking brake line pressure is p1, with p1 > Δp1. The parking line pressure is zero, i.e., p2 < Δp2, where Δp2 represents the parking line pressure when the dump truck is in automatic parking. The pressure sensor is closed, indicating that the vehicle is manually parked. The relay of the vehicle protection controller 3 is de-energized, as is the parking solenoid valve. Automatic parking is not activated, and the vehicle display 6 indicates that the parking state is "auto-park released."

[0083] When the handbrake is released, the parking line pressure p2>Δp2, and the pressure sensor state is disconnected. If the cargo box 8 drops into place, the vehicle protection controller 3 de-energizes the relay based on the height information detected by the cargo compartment height sensor 2, and then the parking solenoid valve 4 de-energizes. The vehicle does not implement automatic parking, and the vehicle display 6 shows that the parking state is automatic parking released.

[0084] If the handbrake is released and the cargo box 8 has not been lowered into place, the driver presses the function button, the relay of the vehicle protection controller 3 loses power, the parking solenoid valve 4 loses power, the vehicle does not implement automatic parking, and the vehicle display 6 shows that the parking state is automatic parking released. This function is used by the driver to unload materials evenly or completely according to production needs. The driver raises the cargo box while driving the vehicle slowly.

[0085] If the handbrake is released, the cargo box 8 has not been lowered into place, and the driver has not pressed the function button, the relay of the vehicle protector control 3 will be energized, so that the parking solenoid valve 4 and the voice reminder device 7 will be energized to implement the parking brake. The voice reminder device will simultaneously issue a prompt voice "Please note, the cargo box has not been lowered", and the vehicle display 6 will show that the parking status is automatic parking, giving the driver sufficient visual and auditory warnings.

[0086] Furthermore, the present invention also provides an automatic parking method for a dump truck, and the automatic parking method is applied to the automatic parking system for the dump truck in the above embodiment.

[0087] The automatic parking method includes:

[0088] S1: Obtain the height signal of the dump truck's cargo box and the pressure signal of the handbrake pipeline.

[0089] S2: Obtaining the pipeline pressure according to the pressure signal.

[0090] S3: Determine whether parking conditions are met.

[0091] The parking condition includes: the line pressure is less than a set pressure threshold and the height signal is greater than a preset height threshold;

[0092] S4: If the parking condition is met, a parking control signal is generated.

[0093] S5: Controlling the parking hydraulic circuit to close according to the parking control signal to achieve automatic parking.

[0094] Because the parking states of the dump truck of the present invention include: an automatic parking state and an automatic parking release state, the automatic parking method of the dump truck further includes:

[0095] S6: Determine whether the first parking release condition is satisfied.

[0096] The first parking release condition includes: the pipeline pressure is greater than or equal to the set pressure threshold, or the pipeline pressure is less than the set pressure threshold and the height signal is less than or equal to the preset height threshold.

[0097] S7: If the first parking release condition is met, a first parking release signal is generated.

[0098] S8: Controlling the parking hydraulic circuit to open according to the first parking release signal to achieve automatic parking release.

[0099] According to production needs, in order to unload evenly or completely, the driver needs to raise the cargo box while driving the vehicle at a slow speed. Therefore, the automatic parking method of the dump truck also includes:

[0100] S9: Acquire an action signal generated according to the driver's operation instruction.

[0101] S10: Determine whether the second parking release condition is satisfied.

[0102] The second parking release condition includes: the pipeline pressure is less than the set pressure threshold, the height signal is greater than the preset height threshold, and the action signal is detected.

[0103] S11: If the second parking release condition is met, a second parking release signal is generated.

[0104] S12: Controlling the parking hydraulic circuit to open according to the second parking release signal to achieve automatic parking release.

[0105] According to the automatic parking method for a dump truck provided by the present invention, after obtaining the action signal generated according to the driver's operating instruction, it is also determined whether the parking conditions are met in combination with the action signal.

[0106] In combination with the parking conditions mentioned in S3, the parking conditions after obtaining the action signal also include: the pipeline pressure is less than the set pressure threshold, the height signal is greater than the preset height threshold and the action signal is not detected.

[0107] If the parking condition is met, a parking control signal is generated, and the parking hydraulic circuit is controlled to close according to the parking control signal to achieve automatic parking.

[0108] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. The methods disclosed in the embodiments are described briefly because they correspond to the systems disclosed in the embodiments. For relevant parts, refer to the description of the systems.

[0109] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An automatic parking system for a dump truck, characterized in that: include: A pressure sensor is connected to the handbrake pipeline of the dump truck and is used to detect a pressure signal; A cargo box height sensor is connected to the cargo box of the dump truck and is used to detect a height signal of the cargo box; a vehicle protection controller connected to the cargo box height sensor and the pressure sensor, configured to obtain a line pressure based on the pressure signal and generate a parking control signal when the line pressure is less than a set pressure threshold and the height signal is greater than a preset height threshold; a parking solenoid valve connected to the parking hydraulic pipeline of the dump truck, and configured to close the parking hydraulic pipeline to achieve automatic parking when receiving the parking control signal; The vehicle protection controller is further used for: When the pipeline pressure is greater than or equal to the set pressure threshold, generating a first control signal; When the pipeline pressure is less than the set pressure threshold and the height signal is less than or equal to the preset height threshold, generating a second control signal; The parking solenoid valve is also used for: When the first control signal or the second control signal is received, the parking hydraulic line is opened to release the automatic parking; The automatic parking system further includes: A cargo box lifting controller is provided in the cab of the dump truck and is connected to the vehicle protection controller, and is used to control the raising or lowering of the cargo box according to the driver's operating instructions and generate corresponding action signals; The vehicle protection controller is further used for: generating a third control signal when the pipeline pressure is less than the set pressure threshold, the height signal is greater than the preset height threshold, and the action signal is detected; The parking solenoid valve is also used for: When the third control signal is received, the parking hydraulic circuit is opened to release the automatic parking.

2. The automatic parking system for dump trucks according to claim 1, characterized in that: The automatic parking system for the dump truck further includes: The vehicle display is connected to the vehicle protection controller and is used to display the parking status of the dump truck; the parking status includes: automatic parking status and automatic parking release status.

3. The automatic parking system for dump trucks according to claim 1, characterized in that: The automatic parking system for the dump truck further includes: A voice prompting device is connected to the vehicle protection controller and is used for providing voice prompts.

4. A method for automatically parking a dump truck, characterized in that: The automatic parking method is applied to the automatic parking system for a dump truck according to any one of claims 1 to 3; the automatic parking method comprises: Obtain the height signal of the dump truck's cargo box and the pressure signal of the handbrake pipeline; obtaining the pipeline pressure according to the pressure signal; Determining whether parking conditions are met; the parking conditions include: the line pressure is less than a set pressure threshold and the height signal is greater than a preset height threshold; If the parking condition is met, a parking control signal is generated; The parking hydraulic circuit is controlled to close according to the parking control signal to achieve automatic parking.

5. The automatic parking method for a dump truck according to claim 4, characterized in that: The automatic parking method for the dump truck further includes: Determining whether a first parking release condition is satisfied; the first parking release condition includes: the line pressure is greater than or equal to the set pressure threshold, or the line pressure is less than the set pressure threshold and the height signal is less than or equal to the preset height threshold; If the first parking release condition is met, a first parking release signal is generated; The parking hydraulic circuit is controlled to open according to the first parking release signal to achieve automatic parking release.

6. The automatic parking method for a dump truck according to claim 4, characterized in that: The automatic parking method for the dump truck further includes: Acquiring an action signal generated according to a driver's operating instruction; controlling the parking hydraulic circuit to close according to the parking control signal to achieve automatic parking; Determine whether a second parking release condition is satisfied; the second parking release condition includes: The pipeline pressure is less than the set pressure threshold, the height signal is greater than the preset height threshold, and the action signal is detected; If the second parking release condition is met, a second parking release signal is generated; The parking hydraulic circuit is controlled to open according to the second parking release signal to achieve automatic parking release.

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