A hydraulic power module, application, hydraulic system, fire truck and method

Abstract

This invention discloses a hydraulic power module, its application, a hydraulic system, a fire truck, and a method. The hydraulic power module, used in the hydraulic system of a fire truck, is suitable for adjusting various hydraulic components. It includes a pressure signal pipeline for monitoring the pressure values ​​of the hydraulic system and controlling the hydraulic output. The pressure signal pipeline collects dynamic pressure values ​​of the hydraulic system in real time, forming a continuous pressure feedback signal. The pressure feedback signal is compared in real time with a preset target pressure value. If the pressure feedback signal continuously deviates from the target pressure value, a fault signal is issued. This hydraulic power module, by setting multiple hydraulic power sources, allows other hydraulic power sources to provide emergency hydraulic power when one source fails, preventing loss of hydraulic power, improving the stability of the hydraulic system, and providing emergency hydraulic power support. The accumulator absorbs pressure signal peaks, stabilizing the pressure signal.

Description

Technical Field

[0001] This invention relates to a hydraulic power module for a fire rescue vehicle, and also to a hydraulic system, application, fire truck, and method. Background Technology

[0002] Against the backdrop of "all-hazard, large-scale emergency response," my country's aviation emergency rescue system is gradually improving, which provides policy support and market demand for the development of aviation emergency rescue equipment such as aircraft fire rescue vehicles.

[0003] Because fire and rescue vehicles have many functional requirements and need to meet certain load-bearing capacity, they usually need multiple hydraulic outriggers to support the frame and hydraulic telescopic rods to control the raising and lowering of ladders, etc. Therefore, many hydraulic cylinders are needed for operation.

[0004] However, existing fire and rescue vehicles require a hydraulic system to control each hydraulic cylinder in order to operate a large number of hydraulic cylinders. Each hydraulic cylinder is equipped with a corresponding oil tank, and a hydraulic pump is required to provide sufficient hydraulic power, which makes them very prone to failure. Summary of the Invention

[0005] In view of the problems of complexity and susceptibility to failure in the hydraulic systems of existing fire and rescue vehicles, this invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a hydraulic power module, which aims to solve the problem of easy failure of hydraulic power in existing fire rescue vehicle hydraulic systems.

[0007] To address the aforementioned technical problems, this invention provides a hydraulic power module for use in the hydraulic system of a fire truck. It is suitable for adjusting various hydraulic components of the fire truck, including a pressure signal pipeline. This pressure signal pipeline monitors the pressure values ​​of the hydraulic system and controls the hydraulic output. The pressure signal pipeline collects dynamic pressure values ​​of the hydraulic system in real time, forming a continuous pressure feedback signal. This pressure feedback signal is compared in real time with a preset target pressure value. If the pressure feedback signal continuously deviates from the target pressure value, a fault signal is issued.

[0008] As a preferred embodiment of the hydraulic power module of the present invention, it further includes a main power source, an electric emergency power source, a manual emergency power source, an input pipeline, and an output pipeline; the main power source, the electric emergency power source, and the manual emergency power source are all connected to the hydraulic fluid source through the input pipeline; the electric emergency power source and the manual emergency power source are activated after receiving a fault signal to maintain the pressure of the hydraulic system; the main power source, the electric emergency power source, and the manual emergency power source are all connected to a multi-way directional valve through the output pipeline to provide the supply and pressure of hydraulic fluid.

[0009] In a preferred embodiment of the hydraulic power module of the present invention, the pressure signal pipeline is connected to the hydraulic fluid source and the multi-way directional valve through the common power source; an accumulator is installed on the pressure signal pipeline to absorb pressure peaks.

[0010] The beneficial effects of the hydraulic power module of the present invention are as follows: by setting multiple hydraulic power sources, when one hydraulic power source fails, other hydraulic power sources can provide emergency hydraulic power to prevent loss of hydraulic power, improve the stability of the hydraulic system and provide emergency hydraulic power support capability. By setting an accumulator, the peak of the pressure signal can be absorbed to make the pressure signal stable, thereby making the hydraulic power variable more stable, the output flow stable, and the corresponding action reduces jitter and improves stability.

[0011] In addition to the hydraulic power module, this invention also provides a hydraulic system to solve the problems of complexity and susceptibility to failure in existing fire truck hydraulic systems. The system includes: a hydraulic power module; a hydraulic fluid source for providing fluid; at least one hydraulic terminal capable of extending or lowering by fluid pressure; the hydraulic power module, connected to the hydraulic fluid source, for controlling and / or regulating pressure; a multi-way directional valve for controlling and / or regulating the flow of hydraulic fluid into the hydraulic terminal; and hydraulic fluid pumped through the hydraulic power module into the multi-way directional valve, which controls the operation of the hydraulic terminal.

[0012] As a preferred embodiment of the hydraulic system described in this invention, the hydraulic fluid source outputs hydraulic fluid to the hydraulic power module on one hand, and recovers the hydraulic fluid used in the multi-way directional valve on the other hand.

[0013] As a preferred embodiment of the hydraulic system of the present invention, the hydraulic fluid source includes a hydraulic oil tank, which has an outlet and a return port; an oil suction filter is disposed at the outlet of the hydraulic oil tank; an oil return filter is disposed at the return port of the hydraulic oil tank; and a high-pressure filter is disposed at the inlet of the multi-way directional valve.

[0014] In a preferred embodiment of the hydraulic system described in this invention, a level gauge and an air filter are disposed in the hydraulic oil tank.

[0015] In a preferred embodiment of the hydraulic system described in this invention, a hydraulic fluid radiator is disposed at the front end of the return oil filter to control the temperature of the hydraulic fluid.

[0016] As a preferred embodiment of the hydraulic system described in this invention, the multi-way directional valve is an open-type load-sensitive multi-way directional valve with both electromagnetic proportional control and handle control modes.

[0017] As a preferred embodiment of the hydraulic system described in this invention, the multi-way directional valve has an oil inlet, a monitoring end, and a return end, and the multi-way directional valve has at least one branch for controlling and / or regulating the hydraulic terminal.

[0018] The beneficial effects of the hydraulic system of the present invention are as follows: The present invention sets up an integrated hydraulic fluid source, a multi-way directional valve and a hydraulic power module. In use, the hydraulic power module can draw hydraulic fluid into the multi-way directional valve. The multi-way directional valve controls the hydraulic fluid to enter each hydraulic terminal through each branch. Multiple hydraulic terminals can be controlled by one hydraulic fluid source and one power module, which simplifies the hydraulic system of fire rescue vehicles and makes them less prone to failure.

[0019] By setting up various filters and air filters, impurities in the hydraulic fluid can be filtered in multiple stages to maintain the cleanliness of the hydraulic fluid. By setting up a hydraulic fluid radiator, the heat generated by the hydraulic system during operation can be dissipated, effectively controlling the hydraulic fluid temperature within the optimal range. This prevents the hydraulic fluid temperature from becoming too high, which could cause aging and damage to the seals and contamination of the hydraulic system. It also prevents the hydraulic fluid viscosity from decreasing due to excessively high temperature, thus affecting the dynamic performance of the system.

[0020] The present invention also provides a fire truck having the above-mentioned hydraulic system and / or hydraulic power module, which can operate a hydraulic terminal using the hydraulic system and / or hydraulic power module.

[0021] The present invention also provides a hydraulic circuit control method for a fire truck, using the aforementioned hydraulic system, comprising the following steps:

[0022] S1, Send a control signal;

[0023] S2. Start the hydraulic power module according to the control signal;

[0024] S3, The hydraulic power module pumps hydraulic fluid to the multi-way directional valve;

[0025] S4. The multi-way directional valve distributes hydraulic fluid to the corresponding hydraulic terminals.

[0026] As a preferred embodiment of the fire truck hydraulic circuit control method of the present invention, after the hydraulic terminal is activated, the hydraulic fluid returns to the hydraulic fluid source through the multi-way reversing valve.

[0027] The beneficial effects of this invention are as follows: the multi-way directional valve determines the pressure data required by each hydraulic terminal according to the control signal, the hydraulic power module pressurizes and delivers hydraulic fluid, the multi-way directional valve sends the hydraulic fluid into the corresponding hydraulic terminal, the hydraulic terminal performs the corresponding action, and the recovered hydraulic fluid is sent back to the hydraulic fluid source after the action is completed. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. 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.

[0029] Figure 1 This is a schematic diagram of the hydraulic power module of the present invention.

[0030] Figure 2 This is a schematic diagram of the overall hydraulic power module of the present invention.

[0031] Figure 3 This is a schematic diagram of the overall hydraulic system of the present invention.

[0032] Figure 4 This is a schematic diagram of the hydraulic fluid source of the present invention.

[0033] Figure 5 This is a schematic diagram of the hydraulic terminal of the present invention.

[0034] Figure 6 This is a schematic diagram of the multi-way directional valve of the present invention.

[0035] Figure 7 This is a flowchart of the hydraulic circuit control method of the present invention. Detailed Implementation

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0039] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0040] Example 1

[0041] Reference Figure 1 This embodiment provides a hydraulic power module to solve the problem of easy failure of existing hydraulic power modules. The hydraulic power module 100 includes a pressure signal pipeline 106, which is used to monitor the pressure value of the hydraulic system and control the hydraulic output.

[0042] The pressure signal pipeline 106 collects the dynamic pressure value of the hydraulic system in real time and forms a continuous pressure feedback signal. The pressure feedback signal is compared with the preset target pressure value in real time. If the pressure feedback signal does not match the target pressure value, a fault signal is issued.

[0043] The hydraulic power module 100 has at least one power mode, which can be used to pump hydraulic fluid according to different situations. In the event of a failure of a certain power mode, it can maintain the normal operation of the hydraulic system. For example, the normal power source 101 uses a hydraulic oil pump, which is a high-pressure plunger variable pump. Under normal conditions, the hydraulic oil pump supplies oil to the multi-way directional valve 400. The electric emergency source 102 is an electric emergency pump, which is used to supply oil in case of failure of the normal power source 101. The manual emergency source 103 is a manual emergency pump, which is used to maintain the last hydraulic power in the event of a complete power outage. By setting three hydraulic power sources, the reliability of the hydraulic system and the emergency power guarantee capability are improved.

[0044] When the monitored pressure is lower than the target pressure lower limit (e.g., 14.5MPa), a boost command is sent to the hydraulic power module 100 to control the variable pump of the common power source 101 to increase the displacement and increase the output flow.

[0045] If the pressure fails to reach the target value and the commonly used power source 101 is abnormal (such as abnormal drop in liquid level), switch to the electric emergency source 102 or the manual emergency source 103 to ensure continuous pressure supply.

[0046] When the monitored pressure reaches the target pressure limit (e.g., 15 MPa), the controller reduces the variable pump displacement or switches to constant pressure mode to maintain stable system pressure.

[0047] Reference Figures 1-3It also includes a common power source 101, an electric emergency power source 102, a manual emergency power source 103, an input pipeline 104, and an output pipeline 105; the common power source 101, the electric emergency power source 102, and the manual emergency power source 103 are all connected to the hydraulic fluid source 200 through the input pipeline 104. The electric emergency power source 102 and the manual emergency power source 103 start after receiving a fault signal to maintain the pressure of the hydraulic system;

[0048] The common power source 101, electric emergency power source 102, and manual emergency power source 103 are all connected to the multi-way directional valve 400 through the output pipeline 105 to provide hydraulic fluid supply and pressure;

[0049] The pressure signal line 106 is connected to the hydraulic fluid source 200 and the multi-way directional valve 400 via the common power source 101;

[0050] Accumulator 107 is installed on pressure signal line 106 to absorb pressure peaks. Accumulator 107 can store a portion of hydraulic fluid. When the system pressure rises sharply, accumulator (107) absorbs the instantaneous pressure peak to avoid overpressure fluctuations in pressure signal line (106). When the pressure drops sharply, accumulator (107) releases the stored hydraulic fluid to replenish the system pressure and shorten the response delay. Through the dynamic charging and discharging of the accumulator, the pressure signal curve is smoothed, the jitter of hydraulic terminal action is reduced, and the pressure signal is made more stable, thereby improving the system's response speed to pressure changes and reducing system jitter and instability.

[0051] Example 2

[0052] exist Figure 3 The exemplary embodiment of the hydraulic system according to the present invention shown can be used as the overall hydraulic system of a fire rescue vehicle, and is particularly suitable for a single hydraulic system to simultaneously control all hydraulic devices of a fire rescue vehicle, in order to solve the complex problems of existing hydraulic systems. It includes at least one hydraulic terminal 300 capable of extending or lowering by fluid pressure; it also includes a hydraulic power module 100 connected to a hydraulic fluid source 200 for controlling and / or regulating pressure; a multi-way directional valve 400 for controlling and / or regulating the flow of hydraulic fluid into the hydraulic terminal 300; and hydraulic fluid is pumped through the hydraulic power module 100 into the multi-way directional valve 400, which controls the operation of the hydraulic terminal 300.

[0053] Reference Figure 5The hydraulic terminal 300 includes, but is not limited to, the central column hydraulic cylinder 301, the slide hydraulic cylinder 302, the left front outrigger hydraulic cylinder 303, the right front outrigger hydraulic cylinder 304, the right rear outrigger hydraulic cylinder 305, the left rear outrigger hydraulic cylinder 306, the main platform telescopic hydraulic cylinder 307, the swing platform telescopic hydraulic cylinder 308, the fixed step up / down hydraulic cylinder 309, the movable step up / down hydraulic cylinder 310, and the rear tailplate retraction / extension hydraulic cylinder 311, which are used to control the various outriggers, pillars, platforms, ladders, etc. of the fire rescue vehicle.

[0054] Correspondingly, a balance valve and / or hydraulic lock are provided at the inlet of each hydraulic cylinder to maintain the hydraulic fluid pressure and the operation of the hydraulic terminal 300.

[0055] The input end of the central column hydraulic cylinder 301 is equipped with a central column balance valve, the input end of the slide hydraulic cylinder 302 is equipped with a slide balance valve, and the input end of the swing platform telescopic hydraulic cylinder 308 is equipped with a swing platform telescopic balance valve.

[0056] The input ends of the hydraulic cylinders 305 for the left front, right front, left rear, and right rear outriggers are all equipped with hydraulic locks. The platform telescopic hydraulic cylinder, the fixed step up and down hydraulic cylinder 309, the movable step up and down hydraulic cylinder 310, and the rear tail plate retraction and extension hydraulic cylinder 311 are all equipped with hydraulic locks.

[0057] Reference Figure 4 The hydraulic fluid source 200 outputs hydraulic fluid to the hydraulic power module 100 on the one hand, and recovers the hydraulic fluid used in the multi-way directional valve 400 on the other hand.

[0058] The hydraulic fluid source 200 includes a hydraulic oil tank 201. The hydraulic oil tank 201 is provided with an outlet and a return port. The outlet is connected to an oil injection pipeline. The hydraulic fluid is drawn out from the outlet by the hydraulic power module 100 and injected into the multi-way directional valve 400. The hydraulic fluid discharged from the multi-way directional valve 400 returns to the hydraulic oil tank 201 through the return oil pipeline from the return port.

[0059] The hydraulic oil tank 201 is equipped with a suction filter 202 and a return filter 203 at its outlet and return port, respectively. The inlet of the multi-way directional valve 400 is equipped with a high-pressure filter 204. The hydraulic fluid is filtered through the three filters to prevent hydraulic fluid contamination and filter out various impurities in the hydraulic system, thus ensuring the cleanliness of the hydraulic fluid.

[0060] The hydraulic oil tank 201 is also equipped with a level gauge 205 and an air filter 206. The level gauge 205 is used to monitor the level data of the hydraulic fluid, and the air filter 206 is used to prevent impurities from entering and contaminating the hydraulic fluid during the refueling process.

[0061] Since the hydraulic system generates heat during operation, a hydraulic fluid radiator 207 is installed at the front end of the return oil filter 203. The hydraulic fluid radiator 207 is a DC motor-driven air-cooled radiator. The input and output ends of the hydraulic fluid radiator 207 are connected by a bypass, and a one-way valve is installed on the bypass to protect the hydraulic fluid radiator 207 from blockage. This is used to control the hydraulic fluid temperature within the optimal range, prevent the hydraulic fluid temperature from being too high, which could cause aging and damage to the seals and contaminate the hydraulic system. It also prevents the hydraulic fluid viscosity from decreasing due to excessively high temperature, which could affect the dynamic performance of the system.

[0062] Example 3

[0063] Reference Figure 6 The difference between this embodiment and embodiment two is that the multi-way directional valve 400 is an open load-sensitive multi-way directional valve 400 with both electromagnetic proportional control and handle control modes.

[0064] The multi-way directional valve 400 has an inlet end 401, a monitoring end 402, and an outlet end 403. The multi-way directional valve 400 has at least one branch 404 inside for controlling and / or regulating the hydraulic terminals 300. The number of branches 404 of the multi-way directional valve 400 corresponds to the number of hydraulic terminals 300. Each branch 404 corresponds to one hydraulic terminal 300. The hydraulic power module 100 draws hydraulic fluid from the hydraulic fluid source 200, pressurizes it, and inputs it into the multi-way directional valve 400. The multi-way directional valve 400 then sends the hydraulic fluid into the corresponding hydraulic terminals 300 through a control signal, thereby realizing the control of multiple hydraulic terminals 300 by one hydraulic system.

[0065] Each branch 404 of the multi-way directional valve 400 is equipped with a solenoid valve with a handle to control the flow of hydraulic fluid. Each branch 404 is also equipped with a flow meter and a pressure gauge to monitor pressure data. The main pipeline of the multi-way directional valve 400 is also equipped with a flow meter and a pressure gauge.

[0066] Example 4

[0067] Reference Figure 7 The difference between this embodiment and the above embodiments is that it also provides a method for controlling the hydraulic circuit of a fire truck, including the following steps:

[0068] S1, Send a control signal;

[0069] S1.1 The controller sends a signal to control the designated hydraulic terminal 300, such as controlling the extension and retraction of the central column hydraulic cylinder 301;

[0070] S1.2 The controller sends a target pressure signal to be achieved, for example, the target pressure is 15MPa;

[0071] S1.3 The controller sends a signal to start the hydraulic power module 100.

[0072] S2. Start hydraulic power module 100;

[0073] S2.1, Hydraulic power module 100 prioritizes starting the common power source 101;

[0074] S2.2 The level gauge 205 in the hydraulic oil tank 201 monitors the oil suction of the hydraulic oil pump. If the level drops normally, it is determined that the power source 101 is normally drawing hydraulic fluid and continues to operate.

[0075] S2.3 If the liquid level is abnormal, for example, the liquid level drop rate is lower than the set value of 0.1m / min, it is determined that the normal power source 101 is not pumping properly, and the controller sends a command to start the electric emergency pump.

[0076] S2.4 The level gauge 205 monitors the oil suction of the electric emergency pump. If the level drops normally, it is determined that the electric emergency power source 102 is normally drawing hydraulic fluid and continues to operate.

[0077] S2.5 If the liquid level drop rate is still below 0.1 m / min, it is determined that the electric emergency source 102 is not pumping properly, and the controller sends a manual control alarm signal to prompt the operator to manually start the manual emergency pump.

[0078] S3, Pump hydraulic fluid and monitor pressure;

[0079] S3.1, The hydraulic power module 100 pumps hydraulic fluid to the multi-way directional valve 400, while the pressure sensor in the pressure signal line 106 monitors the pressure value in the line.

[0080] S3.2 If the pressure value in the pressure signal line 106 is less than the target pressure of 14.5 MPa, then continue pumping;

[0081] S3.3 If the pressure value in the pressure signal pipeline 106 reaches 14.5MPa, the controller issues a command to reduce the pumping flow of the hydraulic power module 100.

[0082] S3.4 If the pressure value in the pressure signal pipeline 106 reaches 15MPa, the controller issues a command to keep the hydraulic power module 100 at the current pumping flow rate and maintain the pressure of the entire hydraulic circuit.

[0083] S4, Multi-way directional valve 400 distributes hydraulic fluid;

[0084] S4.1 After receiving the control signal, the multi-way directional valve 400 activates the solenoid valve, opening the branch 404 corresponding to the central column hydraulic cylinder 301, allowing hydraulic fluid to enter the central column hydraulic cylinder 301 and causing it to extend and retract.

[0085] S4.2 Excess hydraulic fluid returns to the hydraulic oil tank 201 through the return oil line.

[0086] Example 5

[0087] This embodiment also provides a method for controlling the hydraulic terminal of a fire truck, including the following steps:

[0088] S1. After the vehicle has come to a complete stop, prepare to park.

[0089] S1.1 The hydraulic power module 100 extracts hydraulic fluid from the hydraulic power source and delivers it to the multi-way directional valve 400. The multi-way directional valve 400 regulates the flow of hydraulic fluid into different cylinders through a solenoid valve.

[0090] S1.2, the multi-way directional valve 400 simultaneously delivers hydraulic fluid to each outrigger cylinder, and each outrigger cylinder controls the grounding support of the outrigger.

[0091] S1.3 The main platform telescopic hydraulic cylinder 307 controls the main platform to slowly lift to the standby height, while other cylinders remain locked.

[0092] S2. Once the vehicle is ready, the operation will begin.

[0093] S2.1 The main platform telescopic hydraulic cylinder 307 starts controlling the main platform to rise again.

[0094] S2.2 As the main platform rises, the fixed step up and down hydraulic cylinders 309 and the movable step up and down hydraulic cylinders 310 control the extension of the ladder.

[0095] S3, Unfold the platform and lock it.

[0096] S3.1 When the main platform and ladder control the swing platform to rise to the target height, the swing platform extension hydraulic cylinder 308 controls the swing platform to unfold.

[0097] S3.2, The tailgate retraction hydraulic cylinder 311 controls the tailgate to unfold.

[0098] Example 6

[0099] This embodiment also provides an intelligent control method for the hydraulic circuit of a fire truck, including the following steps:

[0100] S1, Power source status monitoring.

[0101] S1.1 The controller collects relevant data from the power source in real time, including:

[0102] The pressure signal line 106 contains the current pressure value, pressure change rate, and flow rate of the hydraulic flow sensor; the power source temperature of the temperature sensor; and the operating status, current load, and historical fault records of the common power source 101, electric emergency power source 102, and manual emergency power source 103.

[0103] S1.2 The controller normalizes the above data and inputs it into the LSTM neural network model to predict the health status of the power source within the next 60 seconds. The prediction results include: 0 (power source is normal) and 1 (power source is about to fail and needs to be switched).

[0104] S1.2.1 Normalization Processing: The controller performs Min-Max normalization on historical pressure, flow, temperature and other data to normalize the range of all input data to [0,1].

[0105] S1.2.2 Time window setting: The LSTM neural network uses system data from the past 10 minutes, sampling once per second, for a total of 600 time steps.

[0106] S1.2.3, LSTM model structure:

[0107] Input layer: contains 10 features (pressure, flow rate, temperature, etc.).

[0108] Two LSTM layers, each with 64 neurons, using ReLU as the activation function.

[0109] Output layer: Sigmoid activation function, outputting the probability of predicting the health of the power source.

[0110] Loss function: Binary cross-entropy Loss, the optimizer is Adam, and the learning rate is set to 0.001. S1.2.4 Prediction logic: When the health score output by the LSTM is lower than the set threshold (e.g., 0.2), it is determined that the power source is about to fail, and the prediction result 1 is returned; otherwise, 0 is returned.

[0111] S1.3 If the prediction result is 0, then the current power source will continue to operate.

[0112] S1.4 If the prediction result is 1, proceed to S2 and execute the power source switching process.

[0113] S2, intelligent switching of power source.

[0114] S2.1 The controller evaluates the current health score of the power source based on the decision tree algorithm.

[0115] S2.1.1 Health score calculation.

[0116] Calculate the pressure stability over the past 10 minutes ( ), rate of temperature change ( ) and current standard deviation ( ).

[0117] Health score is calculated using a weighted formula. :

[0118]

[0119] If the calculation result is >80%, maintain the current power source; if it is <80%, proceed to S2.2 to switch power sources.

[0120] S2.2 If the health score of electric emergency power source 102 is >80%, then:

[0121] Send a command to start the electric emergency power source 102, monitor the fuel supply status of the electric emergency power source 102. If the fuel supply is normal, the switch is completed and the switch time is recorded. If the fuel supply is abnormal, proceed to S2.3.

[0122] S2.3 If the electric emergency power source 102 has an abnormal fuel supply or a health score <80%, then:

[0123] Send a command to start manual emergency source 103. If manual emergency source 103 is running normally, the switchover is complete; otherwise, proceed to S2.4.

[0124] S2.4 If the manual emergency fuel supply 103 is abnormal:

[0125] An alarm signal is triggered, prompting manual intervention.

[0126] S3. System stability monitoring after switching.

[0127] S3.1 After the power source is switched, the controller continuously monitors the pressure changes in the pressure signal pipeline 106.

[0128] S3.2 If the pressure value in the pressure signal pipeline 106 after switching is ≥14.5MPa, then maintain the current pumping state.

[0129] S3.3 If the pressure value in pressure signal pipeline 106 after switching is <14.5MPa, then:

[0130] If the current power source still has remaining output capacity, the pumping flow rate is increased; if the current power source has reached its maximum output, the S2 logic is triggered again to reassess the backup power source.

[0131] S3.3.1 Calculate the new pumping flow rate :

[0132] ;

[0133] in, This indicates the current pumping flow rate; if the current pressure... If the pressure is less than 14.5 MPa, calculate the new pumping flow rate:

[0134] If the pressure returns to 14.5 MPa, maintain the flow rate unchanged.

[0135] S3.3.2 Reassess the backup power source:

[0136] If the pressure does not recover after 5 consecutive adjustments:

[0137] The S2 logic is triggered to reassess the backup power source.

[0138] S3.4 If the pressure value in pressure signal pipeline 106 is ≥15MPa, then:

[0139] The controller reduces the output flow of the power source to maintain the pressure within a safe range.

[0140] By combining a neural network prediction model (LSTM) and decision tree intelligent switching logic, the system can predict the risk of power source failure in advance, rather than taking measures after a failure occurs. It intelligently switches to a backup power source before a failure occurs, ensuring system pressure stability and avoiding instantaneous pressure loss.

[0141] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise changed, and the nature or number or position of discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. Therefore, the invention is not limited to the particular embodiments but extends to a variety of modifications that still fall within the scope of the appended claims.

[0142] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0143] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An intelligent control method for the hydraulic circuit of a fire truck, comprising the following steps: S1, Power source status monitoring; S1.1 The controller collects relevant data from the power source in real time, including: The current pressure value, pressure change rate, and flow rate of the hydraulic flow sensor in the pressure signal pipeline (106); the power source temperature of the temperature sensor; the operating status, current load, and historical fault records of the common power source (101), electric emergency power source (102), and manual emergency power source (103); S1.2 The controller normalizes the above data and inputs it into the LSTM neural network model to predict the health status of the power source within the next 60 seconds. The prediction results include: 0 Power source is normal, 1 Power source is about to fail and needs to be switched. S1.2.1 Normalization Processing: The controller performs Min-Max normalization on historical pressure, flow, and temperature data to normalize the range of all input data to [0,1]. S1.2.2 Time window setting: The LSTM neural network uses system data from the past 10 minutes, sampling once per second, for a total of 600 time steps; S1.2.3, LSTM model structure: Input layer: Contains 10 features, including at least pressure, flow rate, and temperature; Two LSTM layers, each with 64 neurons, using ReLU activation function; Output layer: Sigmoid activation function, outputting the predicted probability of the power source's health; Loss function: binary cross-entropy Loss, the optimizer is Adam, and the learning rate is set to 0.001; S1.2.4 prediction logic: when the health score output by LSTM is lower than the set threshold, it is determined that the power source is about to fail and the prediction result 1 is returned; otherwise, 0 is returned. S1.3 If the prediction result is 0, then the current power source will continue to operate. S1.4 If the prediction result is 1, proceed to S2 and execute the power source switching process; S2, intelligent switching of power source; S2.1 The controller evaluates the current health score of the power source based on the decision tree algorithm; S2.1.1 Health score calculation; Calculate pressure stability over the past 10 minutes Temperature change rate and current standard deviation ; Health score is calculated using a weighted formula. : ， If the calculation result is >80%, maintain the current power source; if it is <80%, proceed to S2.2 to switch power sources. S2.2 If the health score of the electric emergency source (102) is >80%, then: Send a command to start the electric emergency source (102), monitor the oil supply status of the electric emergency source (102), if the oil supply is normal, the switching is completed and the switching time is recorded; if the oil supply is abnormal, proceed to S2.

3. S2.3 If the electric emergency power source (102) has an abnormal fuel supply or a health score <80%, then: Send a command to start the manual emergency source (103). If the manual emergency source (103) is running normally, the switch is complete; otherwise, proceed to S2.

4. S2.4 If the manual emergency source (103) has an abnormal fuel supply: Trigger an alarm signal to prompt manual intervention; S3. System stability monitoring after switching; S3.1 After the power source is switched, the controller continuously monitors the pressure change in the pressure signal pipeline (106); S3.2 If the pressure value in the pressure signal pipeline (106) after switching is ≥14.5MPa, then maintain the current pumping state; S3.3 If the pressure value in the pressure signal pipeline (106) after switching is <14.5MPa, then: If the current power source still has remaining output capacity, increase the pumping flow rate; if the current power source has reached its maximum output, trigger the S2 logic again to reassess the backup power source. S3.3.1 Calculate the new pumping flow rate : ， in, This indicates the current pumping flow rate; if the current pressure... If the pressure is less than 14.5 MPa, calculate the new pumping flow rate: If the pressure returns to 14.5 MPa, maintain the flow rate unchanged; S3.3.2 Reassess the backup power source: If the pressure does not recover after 5 consecutive adjustments: Trigger S2 logic to reassess the backup power source; S3.4 If the pressure value in the pressure signal pipeline (106) is ≥15MPa, then: The controller reduces the output flow of the power source to maintain the pressure within a safe range.

2. A hydraulic system, employing the intelligent control method described in claim 1, for adjusting various hydraulic components of a fire truck, characterized in that: Includes a hydraulic power module (100). Pressure signal line (106), the pressure signal line (106) is used to monitor the pressure value of the hydraulic system and control the hydraulic output; The pressure signal pipeline (106) collects the dynamic pressure values ​​of the hydraulic system in real time and forms a continuous pressure feedback signal; The pressure feedback signal is compared with the preset target pressure value in real time. If the pressure feedback signal does not match the target pressure value, a fault signal is issued. It also includes a common power source (101), an electric emergency power source (102), a manual emergency power source (103), an input pipeline (104), and an output pipeline (105). The common power source (101), electric emergency source (102), and manual emergency source (103) are all connected to the hydraulic fluid source (200) through the input pipeline (104). The electric emergency source (102) and the manual emergency source (103) start after receiving a fault signal to maintain the pressure of the hydraulic system. The commonly used power source (101), electric emergency power source (102), and manual emergency power source (103) are all connected to the multi-way directional valve (400) through the output pipeline (105) to provide the supply and pressure of hydraulic fluid; The pressure signal pipeline (106) is connected to the hydraulic fluid source (200) and the multi-way directional valve (400) through the common power source (101); An accumulator (107) is installed on the pressure signal line (106) to absorb pressure peaks; It also includes a hydraulic fluid source (200) for supplying fluid. At least one hydraulic terminal (300) is capable of extending or lifting by fluid pressure; A hydraulic power module (100) is connected to the hydraulic fluid source (200) and is used to control and / or regulate pressure; A multi-way directional valve (400) for controlling and / or regulating the flow of hydraulic fluid into the hydraulic terminal (300); and, Hydraulic fluid is pumped into the multi-way directional valve (400) through the hydraulic power module (100), and the multi-way directional valve (400) controls the hydraulic terminal (300) to operate. The multi-way directional valve (400) has an oil inlet (401), a monitoring end (402), and an oil return end (403). The multi-way directional valve (400) has at least one branch (404) inside for controlling and / or regulating the hydraulic terminal (300).

3. The hydraulic system according to claim 2, characterized in that: The hydraulic fluid source (200) outputs hydraulic fluid to the hydraulic power module (100) on the one hand, and recovers the hydraulic fluid used in the multi-way directional valve (400) on the other hand.

4. The hydraulic system according to claim 2 or 3, characterized in that: The hydraulic fluid source (200) includes a hydraulic oil tank (201), which is provided with a discharge port and a recovery port; An oil suction filter (202) is provided at the outlet of the hydraulic oil tank (201); A return oil filter (203) is provided at the recovery port of the hydraulic oil tank (201); A high-pressure filter (204) is provided at the inlet of the multi-way reversing valve (400).

5. The hydraulic system according to claim 4, characterized in that: A level gauge (205) and an air filter (206) are installed in the hydraulic oil tank (201).

6. The hydraulic system according to claim 5, characterized in that: A hydraulic fluid radiator (207) is installed at the front end of the return oil filter (203) to control the temperature of the hydraulic fluid.

7. The hydraulic system according to any one of claims 2, 3, 5, and 6, characterized in that: The multi-way directional valve (400) is an open load-sensitive multi-way directional valve (400) with both electromagnetic proportional control and handle control modes.

8. A fire truck, characterized in that: It has the hydraulic system according to claim 2.

9. A method for controlling the hydraulic circuit of a fire truck, characterized in that: The fire truck has a hydraulic system according to any one of claims 2 to 6, comprising the following steps: S1, Send a control signal; S2. Start the hydraulic power module (100) according to the control signal; S3, Hydraulic power module (100) pumps hydraulic fluid to multi-way directional valve (400). S4. The multi-way directional valve (400) distributes hydraulic fluid to the corresponding hydraulic terminals (300). After the hydraulic terminal (300) is activated, the hydraulic fluid returns to the hydraulic fluid source (200) through the multi-way directional valve (400).

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