Hydraulic power module, application, hydraulic system, fire fighting truck and method

Abstract

The invention discloses a hydraulic power module, application, a hydraulic system, a fire fighting truck and a method, the hydraulic power module for the hydraulic system of a fire rescue vehicle is suitable for adjusting hydraulic components of the fire fighting truck and comprises a pressure signal pipeline, and the pressure signal pipeline is used for monitoring the pressure value of the hydraulic system and controlling hydraulic output; the pressure signal pipeline collects the dynamic pressure value of the hydraulic system in real time to form a continuous pressure feedback signal; the pressure feedback signal is compared with a preset target pressure value in real time, and if the pressure feedback signal is not consistent with the target pressure value continuously, a fault signal is sent out. According to the hydraulic power module, multiple hydraulic power sources are arranged, when one hydraulic power source breaks down, other hydraulic power sources can provide hydraulic power in emergency, loss of the hydraulic power is prevented, the stability of a hydraulic system is improved, and the hydraulic power emergency guarantee capacity is provided; and the pressure signal is stable.

Description

Technical Field

[0001] The present invention relates to a hydraulic power module for a fire and rescue vehicle, and also relates to a hydraulic system, uses, a fire truck, and a method. Background Art

[0002] Under the background of "all types of disasters, large-scale emergency response", China's aviation emergency rescue system is gradually being improved, which provides policy support and market demand for the development of aviation emergency rescue equipment such as aircraft fire and rescue vehicles.

[0003] Due to the many functional requirements of fire and rescue vehicles and the need to meet a certain load-bearing capacity, multiple hydraulic outriggers are usually required to support the vehicle frame, and hydraulic telescopic rods are needed to control the lifting and retracting of ladders, etc. Therefore, many hydraulic cylinders are required for operation.

[0004] However, for existing fire and rescue vehicles to operate a large number of hydraulic cylinders, a hydraulic system is required to control each hydraulic cylinder, and a corresponding oil storage tank is equipped for each hydraulic cylinder. Moreover, in order to provide sufficient hydraulic power, a hydraulic pump needs to be correspondingly equipped, which is very prone to failures. Summary of the Invention

[0005] In view of the problems of complex system and easy failure existing in the hydraulic system of existing fire and rescue vehicles, the present invention is proposed.

[0006] Therefore, the object of the present invention is to provide a hydraulic power module, and its purpose is to solve the problem of easy failure of the hydraulic power of the hydraulic system of existing fire and rescue vehicles.

[0007] To solve the above technical problems, the present invention provides a hydraulic power module for a fire and rescue vehicle hydraulic system, which is suitable for adjusting each hydraulic component of a fire truck, including a pressure signal pipeline for monitoring the pressure value of the hydraulic system and controlling hydraulic output; the pressure signal pipeline collects the dynamic pressure value of the hydraulic system in real time to form a continuous pressure feedback signal; the pressure feedback signal is compared with a preset target pressure value in real time, and if the pressure feedback signal continuously does not match the target pressure value, a fault signal is issued.

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

[0009] As 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 control valve through the common power source; an accumulator is arranged on the pressure signal pipeline for absorbing pressure peaks.

[0010] The beneficial effects of the hydraulic power module of the present invention are as follows: by providing multiple hydraulic power sources, when a certain hydraulic power source fails, other hydraulic power sources can provide hydraulic power emergently to prevent the loss of hydraulic power, improve the stability of the hydraulic system and provide the emergency guarantee ability of hydraulic power. By providing an accumulator, the peak of the pressure signal can be absorbed to make the pressure signal stable, so that the hydraulic power variable is more stable, the output flow is stable, and the corresponding actions reduce jitter and improve stability.

[0011] In addition to the hydraulic power module, the present invention also provides a hydraulic system for solving the problems of the complex hydraulic system of existing fire trucks and easy failures. The hydraulic system includes a hydraulic power module, a hydraulic fluid source for providing fluid, at least one hydraulic terminal capable of stretching or lifting through fluid pressure, a hydraulic power module connected to the hydraulic fluid source for controlling and / or regulating pressure, a multi-way directional control valve for controlling and / or regulating the hydraulic fluid entering the hydraulic terminal, and the hydraulic fluid is pumped into the multi-way directional control valve through the hydraulic power module, and the multi-way directional control valve controls the actions of the hydraulic terminal.

[0012] As a preferred embodiment of the hydraulic system of the present invention, the hydraulic fluid source outputs hydraulic fluid to the hydraulic power module on the one hand and recovers the used hydraulic fluid in the multi-way directional control 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 provided with a discharge port and a recovery port, an oil suction filter arranged at the discharge port of the hydraulic oil tank, a return oil filter arranged at the recovery port of the hydraulic oil tank, and a high-pressure filter arranged at the inlet of the multi-way directional control valve.

[0014] As a preferred embodiment of the hydraulic system of the present invention, a liquid level gauge and an air filter are arranged in the hydraulic oil tank.

[0015] As a preferred embodiment of the hydraulic system of the present invention, a hydraulic fluid radiator is arranged at the front end of the return oil filter for controlling the temperature of the hydraulic fluid.

[0016] As a preferred embodiment of the hydraulic system of the present invention, the multi-way directional control valve is an open-type load-sensing multi-way directional control valve with two control methods of electromagnetic proportional control and handle control.

[0017] As a preferred embodiment of the hydraulic system of the present invention, the multi-way directional control valve has an oil inlet, a monitoring port, and an oil return port, and at least one branch is provided inside the multi-way directional control valve for controlling and / or regulating the hydraulic terminal.

[0018] The beneficial effects of the hydraulic system of the present invention are as follows: By providing an integral hydraulic fluid source, a multi-way directional control valve, and a hydraulic power module, when in use, the hydraulic power module can pump the hydraulic fluid into the multi-way directional control valve, and the multi-way directional control valve controls the hydraulic fluid to enter each hydraulic terminal through each branch, enabling multiple hydraulic terminals to be controlled by one hydraulic fluid source and one power module, simplifying the hydraulic system of the fire truck and being less prone to failure.

[0019] By providing 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 providing a hydraulic fluid radiator, the heat generated during the operation of the hydraulic system is dissipated, effectively controlling the temperature of the hydraulic fluid within the optimal range, preventing the temperature of the hydraulic fluid from being too high, causing aging and damage of the seals, polluting the hydraulic system, and also preventing the viscosity of the hydraulic fluid from decreasing due to too high a temperature, thereby 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, capable of operating the hydraulic terminal using the hydraulic system and / or hydraulic power module.

[0021] The present invention also provides a method for controlling a hydraulic circuit of a fire truck, using the above-mentioned hydraulic system, which includes the following steps: S1. Send a control signal; S2. Start the hydraulic power module according to the control signal; S3. The hydraulic power module pumps the hydraulic fluid to the multi-way directional control valve; S4. The multi-way directional control valve distributes the hydraulic fluid to the corresponding hydraulic terminal.

[0022] As a preferred embodiment of the method for controlling a hydraulic circuit of a fire truck of the present invention, after the hydraulic terminal acts, the hydraulic fluid returns to the hydraulic fluid source through the multi-way directional control valve.

[0023] The beneficial effects of the present invention: The multi-way directional control valve judges the pressure data required by each hydraulic terminal according to the control signal, the hydraulic power module pressurizes and conveys the hydraulic fluid, the multi-way directional control valve sends the hydraulic fluid into the corresponding hydraulic terminal, the hydraulic terminal performs corresponding actions, and the recovered hydraulic fluid is sent back to the hydraulic fluid source after the actions are completed. Description of the Drawings

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 Schematic diagram of the hydraulic power module of the present invention.

[0026] Figure 2 Overall schematic diagram of the hydraulic power module of the present invention.

[0027] Figure 3 Overall schematic diagram of the hydraulic system of the present invention.

[0028] Figure 4 Schematic diagram of the hydraulic fluid source of the present invention.

[0029] Figure 5 Schematic diagram of the hydraulic terminal of the present invention.

[0030] Figure 6 Schematic diagram of the multi-way directional control valve of the present invention.

[0031] Figure 7 Flowchart of the hydraulic circuit control method of the present invention. Detailed implementation manners

[0032] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will make a detailed description of the specific implementation manners of the present invention in conjunction with the drawings of the specification.

[0033] In the following description, many specific details are set forth to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0034] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that can be included in at least one implementation manner of the present invention. The "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that mutually excludes other embodiments.

[0035] Next, the present invention will be described in detail with reference to the schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally in a non-general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0036] Embodiment 1

[0037] Referring to Figure 1 , this embodiment provides a hydraulic power module for solving the problem that the hydraulic power in the prior art is prone to failure. The hydraulic power module 100 includes a pressure signal pipeline 106, and the pressure signal pipeline 106 is used to monitor the pressure value of the hydraulic system and control the hydraulic output; The pressure signal pipeline 106 continuously collects the dynamic pressure value of the hydraulic system to form a continuous pressure feedback signal; the pressure feedback signal is compared with a preset target pressure value in real time. If the pressure feedback signal continuously does not match the target pressure value, a fault signal is issued.

[0038] The hydraulic power module 100 has at least one set of power modes, which can adopt different power modes to pump hydraulic fluid according to the situation, and can maintain the normal operation of the hydraulic system when a certain power mode fails. For example, the common power source 101 uses a hydraulic oil pump, and the hydraulic oil pump is a high-pressure plunger variable pump. Under normal conditions, the hydraulic oil pump supplies oil to the multi-way directional control valve 400; the electric emergency source 102 is an electric emergency pump, which is used for emergency oil supply when the common power source 101 fails; the manual emergency source 103 is a manual emergency pump, which is used to maintain the final hydraulic power in the case of a complete vehicle circuit interruption. By setting three hydraulic power sources, the reliability of the hydraulic system and the power emergency guarantee ability are improved; When the monitored pressure is lower than the lower limit of the target pressure (such as 14.5 MPa), a boosting instruction 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; If the pressure continues to not reach the target value and the common power source 101 is abnormal (such as abnormal liquid level drop), switch to the electric emergency source 102 or the manual emergency source 103 to ensure continuous pressure supply; When the monitored pressure reaches the upper limit of the target pressure (such as 15 MPa), the controller reduces the displacement of the variable pump or switches to the constant pressure mode to maintain the stability of the system pressure.

[0039] Referring to Figures 1 - 3, 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 are started after receiving a fault signal and are used to maintain the pressure of the hydraulic system; The common power source 101, the electric emergency power source 102, and the manual emergency power source 103 are all connected to the multi-way directional control valve 400 through the output pipeline 105, for providing the supply and pressure of the hydraulic fluid; The pressure signal pipeline 106 is connected to the hydraulic fluid source 200 and the multi-way directional control valve 400 through the common power source 101; An accumulator 107 is arranged on the pressure signal pipeline 106 and is used to absorb the pressure peak. The accumulator 107 can store a part of the hydraulic fluid. When the system pressure suddenly rises, the accumulator (107) absorbs the instantaneous pressure peak to avoid overpressure fluctuations of the pressure signal pipeline (106); when the pressure suddenly drops, the accumulator (107) releases the stored hydraulic fluid to supplement 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 the hydraulic terminal action is reduced, so that the pressure signal is more stable, the response speed of the system to pressure changes is improved, and the jitter and instability of the system are reduced.

[0040] Embodiment 2

[0041] In Figure 3 the exemplary embodiment of the hydraulic system according to the present invention shown in can be used as the overall hydraulic system of a fire and rescue vehicle, and is particularly suitable for a set of hydraulic systems to simultaneously control all hydraulic devices of the fire and rescue vehicle, for solving the problem of the complexity of the hydraulic system in the prior art, including at least one hydraulic terminal 300 that can expand and contract or lift through fluid pressure; also includes a hydraulic power module 100, which is connected to the hydraulic fluid source 200 and is used to control and / or regulate the pressure; a multi-way directional control valve 400, which is used to control and / or regulate the hydraulic fluid entering the hydraulic terminal 300; and the hydraulic fluid is pumped into the multi-way directional control valve 400 through the hydraulic power module 100, and the multi-way directional control valve 400 controls the action of the hydraulic terminal 300.

[0042] Referring to Figure 5, wherein, the hydraulic terminal 300 includes, but is not limited to, a middle column hydraulic cylinder 301, a slide hydraulic cylinder 302, a left front outrigger hydraulic cylinder 303, a right front outrigger hydraulic cylinder 304, a right rear outrigger hydraulic cylinder 305, a left rear outrigger hydraulic cylinder 306, a main platform telescopic hydraulic cylinder 307, a swing platform telescopic hydraulic cylinder 308, a fixed step up-and-down hydraulic cylinder 309, a movable step up-and-down hydraulic cylinder 310, and a rear tailgate retracting and extending hydraulic cylinder 311, which are respectively used to control the outriggers, columns, platforms, ladders, etc. of the fire rescue vehicle.

[0043] Correspondingly, a balance valve and / or a 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.

[0044] A middle column balance valve is provided at the input end of the middle column hydraulic cylinder 301, a slide balance valve is provided at the input end of the slide hydraulic cylinder 302, and a swing platform telescopic balance valve is provided at the input end of the swing platform telescopic hydraulic cylinder 308.

[0045] Hydraulic locks are provided at the input ends of the left front, right front, left rear, and right rear outrigger hydraulic cylinders 305, and hydraulic locks are provided for 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 tailgate retracting and extending hydraulic cylinder 311.

[0046] Refer to Figure 4 , on the one hand, the hydraulic fluid source 200 outputs hydraulic fluid to the hydraulic power module 100, and on the other hand, it recovers the used hydraulic fluid in the multi-way directional control valve 400.

[0047] The hydraulic fluid source 200 includes a hydraulic oil tank 201. The hydraulic oil tank 201 is provided with a discharge port and a recovery port. The discharge port is connected to an oil injection pipeline, and the hydraulic fluid is pumped out from the discharge port by the hydraulic power module 100 and injected into the multi-way directional control valve 400. The hydraulic fluid discharged from the multi-way directional control valve 400 returns to the hydraulic oil tank 201 through the return pipeline from the recovery port; An oil suction filter 202 and a return oil filter 203 are respectively provided at the discharge port and the recovery port of the hydraulic oil tank 201, and a high-pressure filter 204 is provided at the inlet of the multi-way directional control valve 400. The hydraulic fluid is filtered by the three filters to prevent the hydraulic fluid from being contaminated, filter various impurities in the hydraulic system, and ensure the cleanliness of the hydraulic fluid.

[0048] A liquid level gauge 205 and an air filter 206 are also installed in the hydraulic oil tank 201. The liquid level gauge 205 is used to monitor the liquid level data of the hydraulic fluid, and the air filter 206 is used to prevent impurities from being mixed in during the refueling process and contaminating the hydraulic fluid.

[0049] Since heat is generated when the hydraulic system is in operation, a hydraulic fluid radiator 207 is provided at the front end of the return oil filter 203. The hydraulic fluid radiator 207 is an air-cooled radiator driven by a DC motor. There is a bypass between the input end and the output end of the hydraulic fluid radiator 207, and a check valve is provided on the bypass to play a role in bypass protection in case the hydraulic fluid radiator 207 is blocked, so as to control the hydraulic fluid temperature within the optimal range, prevent the hydraulic fluid temperature from being too high, causing the aging and damage of seals, polluting the hydraulic system, and at the same time preventing the decrease of the hydraulic fluid viscosity due to too high hydraulic fluid temperature, which affects the dynamic performance of the system.

[0050] Embodiment Three

[0051] Refer to Figure 6 , the difference between this embodiment and Embodiment Two is that: the multi-way directional control valve 400 is an open-type load-sensitive multi-way directional control valve 400 with two control methods of electromagnetic proportional control and handle control.

[0052] The multi-way directional control valve 400 has an oil inlet end 401, a monitoring end 402, and an oil return end 403. Inside the multi-way directional control valve 400, there is at least one branch 404 for controlling and / or adjusting the hydraulic terminal 300. The number of branches 404 of the multi-way directional control valve 400 corresponds to the number of hydraulic terminals 300. Each branch 404 corresponds to a hydraulic terminal 300 respectively. The hydraulic power module 100 pumps the hydraulic fluid out of the hydraulic fluid source 200, pressurizes it and then inputs it into the multi-way directional control valve 400. The multi-way directional control valve 400 then sends the hydraulic fluid into the corresponding hydraulic terminal 300 through a control signal, realizing the control of a set of hydraulic system for multiple hydraulic terminals 300.

[0053] On each branch 404 of the multi-way directional control valve 400, there is a solenoid valve with a handle for controlling the passage of the hydraulic fluid. At the same time, on each branch 404, there are also a flow meter and a pressure gauge for monitoring pressure data. The main pipeline of the multi-way directional control valve 400 is also provided with a flow meter and a pressure gauge.

[0054] Embodiment Four

[0055] Refer to Figure 7 , the difference between this embodiment and the above embodiments is that a method for controlling the hydraulic circuit of a fire truck is also provided, including the following steps: S1. Send a control signal; S1.1. The controller sends a signal to control the specified hydraulic terminal 300, such as controlling the telescopic movement of the middle column hydraulic cylinder 301; S1.2. The controller sends a target pressure signal to be achieved, such as the target pressure is 15 MPa; S1.3. The controller sends a signal to start the hydraulic power module 100.

[0056] S2. Start the hydraulic power module 100; S2.1. The hydraulic power module 100 preferentially starts the common power source 101; S2.2. The liquid level gauge 205 in the hydraulic oil tank 201 monitors the oil suction condition of the hydraulic oil pump. If the liquid level drops normally, it is judged that the common power source 101 normally extracts the hydraulic fluid and continues to operate; S2.3. If the liquid level is abnormal, for example, the liquid level drop speed is lower than the set value of 0.1 m / min, it is judged that the common power source 101 does not extract normally, and the controller issues an instruction to start the electric emergency pump; S2.4. The liquid level gauge 205 monitors the oil suction condition of the electric emergency pump. If the liquid level drops normally, it is judged that the electric emergency source 102 normally extracts the hydraulic fluid and continues to operate; S2.5. If the liquid level drop speed is still lower than 0.1 m / min, it is judged that the electric emergency source 102 does not extract normally, and the controller issues a manual control alarm signal to prompt the operator to manually start the manual emergency pump.

[0057] S3. Pump the hydraulic fluid and monitor the pressure; S3.1. The hydraulic power module 100 pumps the hydraulic fluid to the multi-way directional control valve 400, and at the same time, the pressure sensor in the pressure signal pipeline 106 monitors the pressure value in the pipeline; S3.2. If the pressure value in the pressure signal pipeline 106 is less than the target pressure of 14.5 MPa, keep pumping; S3.3. If the pressure value in the pressure signal pipeline 106 reaches 14.5 MPa, the controller issues an instruction to make the hydraulic power module 100 reduce the pumping flow rate; S3.4. If the pressure value in the pressure signal pipeline 106 reaches 15 MPa, the controller issues an instruction to make the hydraulic power module 100 maintain the current pumping flow rate and maintain the pressure of the entire hydraulic circuit.

[0058] S4. The multi-way directional control valve 400 distributes the hydraulic fluid; S4.1. After receiving the control signal, the solenoid valve of the multi-way directional control valve 400 acts to open the branch 404 corresponding to the middle column hydraulic cylinder 301, and the hydraulic fluid enters the middle column hydraulic cylinder 301 to make it expand and contract; S4.2. The excess hydraulic fluid returns to the hydraulic oil tank 201 through the return pipeline.

[0059] Embodiment 5

[0060] This embodiment also provides a hydraulic terminal control method for a fire truck, including the following steps: S1. After the vehicle stops stably, make preparations for parking.

[0061] S1.1. The hydraulic power module 100 extracts hydraulic fluid from the hydraulic power source and conveys it to the multi-way directional control valve 400, and the multi-way directional control valve 400 regulates the hydraulic fluid to enter different oil cylinders through solenoid valves.

[0062] S1.2. The multi-way directional control valve 400 conveys hydraulic fluid to each outrigger cylinder simultaneously, and each outrigger cylinder controls the outrigger to touch the ground for support.

[0063] S1.3. The main platform telescopic hydraulic cylinder 307 controls the main platform to slowly lift to the standby height, and other cylinders remain locked.

[0064] S2. After the vehicle is ready, the operation is started.

[0065] S2.1. The main platform telescopic hydraulic cylinder 307 starts to control the main platform to rise again.

[0066] S2.2. While the main platform is rising, the fixed step up and down hydraulic cylinder 309 and the movable step up and down hydraulic cylinder 310 control the ladder to extend.

[0067] S3. Expand the platform and lock it.

[0068] S3.1. When the main platform and the ladder control the swing platform to rise to the target height, the swing platform telescopic hydraulic cylinder 308 controls the swing platform to expand.

[0069] S3.2. The rear tailgate retracting and extending hydraulic cylinder 311 controls the tailgate to expand.

[0070] Embodiment Six

[0071] This embodiment also provides an intelligent control method for the hydraulic circuit of a fire truck, including the following steps: S1. Power source status monitoring.

[0072] S1.1. The controller collects power source related data in real time, including: The current pressure value, pressure change rate in the pressure signal pipeline 106, the flow rate of the hydraulic flow sensor; the power source temperature of the temperature sensor; the operating status, current load, historical fault records, etc. of the common power source 101, the electric emergency source 102, and the manual emergency source 103.

[0073] 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 (the power source is normal), 1 (the power source is about to fail and needs to be switched).

[0074] S1.2.1. Normalization processing: The controller performs Min-Max normalization on historical data such as pressure, flow rate, and temperature, so that the range of all input data is normalized to [0,1].

[0075] S1.2.2. Time window setting: The LSTM neural network uses the system data of the past 10 minutes, samples once per second, with a total of 600 time steps.

[0076] S1.2.3. LSTM model structure:

[0077] Input layer: It contains 10 features (such as pressure, flow rate, temperature, etc.).

[0078] Two layers of LSTM, with 64 neurons in each layer, and the activation function is ReLU.

[0079] Output layer: The Sigmoid activation function, and the output is the health prediction probability of the power source.

[0080] Loss function: Binary cross-entropy Loss, the optimizer uses 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 (such as 0.2), it is determined that the power source is about to fail, and the prediction result 1 is returned, otherwise 0 is returned.

[0081] S1.3. If the prediction result is 0, then keep the current power source running.

[0082] S1.4. If the prediction result is 1, then enter S2 and execute the power source switching process.

[0083] S2. Intelligent power source switching.

[0084] S2.1. The controller evaluates the health score of the current power source based on the decision tree algorithm.

[0085] S2.1.1 Health score calculation.

[0086] Calculate the pressure stability in the past 10 minutes ( ), the temperature change rate ( ), and the current standard deviation ( ).

[0087] Use a weighted formula to calculate the health score :

[0088] If the calculation result > 80%, keep the current power source; if < 80%, enter S2.2 to execute the power source switching.

[0089] S2.2. If the health score of the electric emergency source 102 > 80%, then: 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 switching is completed, record the switching time. If the fuel supply is abnormal, enter S2.3.

[0090] S2.3: If the fuel supply of the electric emergency power source 102 is abnormal or the health score < 80%, then: Send a command to start the manual emergency power source 103. If the manual emergency power source 103 is operating normally, the switching is completed. Otherwise, enter S2.4.

[0091] S2.4: If the fuel supply of the manual emergency power source 103 is abnormal: Trigger an alarm signal to remind for manual intervention.

[0092] S3: Monitor the system stability after switching.

[0093] S3.1: After the power source switching is completed, the controller continuously monitors the pressure change in the pressure signal pipeline 106.

[0094] S3.2: If the pressure value in the pressure signal pipeline 106 after switching ≥ 14.5 MPa, maintain the current pumping state.

[0095] S3.3: If the pressure value in the pressure signal pipeline 106 after switching < 14.5 MPa, then: If the current power source still has remaining output capacity, increase the pumping flow; if the current power source has reached the maximum output, trigger the S2 logic again to re-evaluate the standby power source.

[0096] S3.3.1 Calculate the new pumping flow : ; Wherein, represents the current pumping flow. If the current pressure < 14.5 MPa, calculate the new pumping flow: If the pressure returns to 14.5 MPa, maintain the flow unchanged.

[0097] S3.3.2 Re-evaluate the standby power source: If the pressure still does not recover after 5 consecutive adjustments: Trigger the S2 logic to re-evaluate the standby power source.

[0098] S3.4: If the pressure value in the pressure signal pipeline 106 ≥ 15 MPa, then: The controller reduces the output flow of the power source to maintain the pressure within the safe range.

[0099] By combining a neural network prediction model (LSTM) and a decision tree intelligent switching logic, the fault risk of the power source can be predicted in advance, rather than taking measures only after the fault occurs. Intelligently switch to the standby power source before the fault occurs to ensure the stability of the system pressure and avoid instantaneous pressure loss.

[0100] It is important to note that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible without substantially departing from the novel teachings and advantages of the subject matter described in this application (for example, the dimensions, scales, structures, shapes and proportions of various components, as well as parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, color, orientation changes, etc.). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0101] In addition, in order to provide a concise description of the exemplary embodiments, not all features of the actual embodiments may be described (i.e., those features that are not relevant to the currently considered best mode of implementing the present invention, or those features that are not relevant to the implementation of the present invention).

[0102] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A hydraulic power module, which is used for the hydraulic system of a fire and rescue vehicle and is suitable for adjusting each hydraulic component of the fire truck, characterized in that: including, a pressure signal pipeline (106) for monitoring the pressure value of a hydraulic system and controlling hydraulic output; the pressure signal pipeline (106) collects the dynamic pressure value of the hydraulic system in real time to form a continuous pressure feedback signal; the pressure feedback signal is compared with a preset target pressure value in real time. If the pressure feedback signal continuously does not match the target pressure value, a fault signal is sent.

2. The hydraulic power module according to claim 1, wherein: It further 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 a hydraulic fluid source (200) through the input pipeline (104). The electric emergency power source (102) and the manual emergency power source (103) are started after receiving the fault signal and are used to maintain the pressure of the hydraulic system; the common power source (101), the electric emergency power source (102) and the manual emergency power source (103) are all connected to a multi-way directional control valve (400) through the output pipeline (105) to provide the supply and pressure of hydraulic fluid.

3. The hydraulic power module according to claim 2, wherein: the pressure signal pipeline (106) is connected to the hydraulic fluid source (200) and the multi-way directional control valve (400) through the common power source (101); an accumulator (107) is arranged on the pressure signal pipeline (106) to absorb pressure peaks.

4. Use of the hydraulic power module according to any one of claims 1 to 3, characterized in that: used to adjust the actions of the outriggers, platform, ladder, and tailgate of a vehicle by using hydraulics.

5. A hydraulic system, characterized in that: including the hydraulic power module according to any one of claims 1 to 3, and further including a hydraulic fluid source (200) for providing fluid; at least one hydraulic terminal (300) capable of telescoping or lifting by fluid pressure; a hydraulic power module (100) connected to the hydraulic fluid source (200) for controlling and / or regulating pressure; a multi-way directional control valve (400) for controlling and / or regulating the entry of hydraulic fluid into the hydraulic terminal (300); and the hydraulic fluid is pumped into the multi-way directional control valve (400) through the hydraulic power module (100), and the multi-way directional control valve (400) controls the action of the hydraulic terminal (300).

6. The hydraulic system according to claim 5, characterized in that: The hydraulic fluid source (200) outputs hydraulic fluid to the hydraulic power module (100) on the one hand and recovers the used hydraulic fluid in the multi-way directional control valve (400) on the other hand.

7. The hydraulic system according to claim 5 or 6, characterized in that: The hydraulic fluid source (200) includes a hydraulic oil tank (201) provided with a discharge port and a recovery port; an oil suction filter (202) is arranged at the discharge port of the hydraulic oil tank (201); a return oil filter (203) is arranged at the recovery port of the hydraulic oil tank (201); a high-pressure filter (204) is arranged at the inlet of the multi-way directional control valve (400).

8. The hydraulic system according to claim 7, wherein: a liquid level gauge (205) and an air filter (206) are arranged in the hydraulic oil tank (201).

9. The hydraulic system according to claim 8, wherein: a hydraulic fluid radiator (207) is arranged at the front end of the return oil filter (203) to control the temperature of the hydraulic fluid.

10. The hydraulic system according to any one of claims 6, 8, and 9, characterized in that: The multi-way directional control valve (400) is an open load-sensing multi-way directional control valve (400) with two control methods: electro-magnetic proportional control and handle control.

11. The hydraulic system according to claim 10, characterized in that: The multi-way directional control valve (400) has an oil inlet end (401), a monitoring end (402), and an oil return end (403). Inside the multi-way directional control valve (400), there is at least one branch (404) for controlling and / or adjusting the hydraulic terminal (300).

12. A fire truck, characterized in that: It has the hydraulic power module according to claim 1 and / or the hydraulic system according to claim 5.

13. A control method for a hydraulic circuit of a fire truck, characterized in that: The fire truck has the hydraulic system according to claim 5, including the following steps: S1. Send a control signal; S2. Start the hydraulic power module (100) according to the control signal; S3. The hydraulic power module (100) pumps hydraulic fluid to the multi-way directional control valve (400); S4. The multi-way directional control valve (400) distributes the hydraulic fluid to the corresponding hydraulic terminal (300).

14. The method according to claim 13, wherein: After the hydraulic terminal (300) operates, the hydraulic fluid returns to the hydraulic fluid source (200) through the multi-way directional control valve (400).

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