Integrated multifunctional hydraulic system and control method

Abstract

The invention discloses an integrated multifunctional hydraulic system which comprises a main hydraulic oil tank and a main hydraulic pump set. Hydraulic oil is stored in the main hydraulic oil tank, the main hydraulic pump set is connected with the main hydraulic oil tank, and the hydraulic oil in the main hydraulic oil tank is conveyed into the system through an oil way to provide hydraulic power. An intelligent pressure compensation device is arranged at the output end of the main hydraulic pump set, and the oil pressure of the system is adjusted in a self-adaptive mode through the intelligent pressure compensation device. The system further comprises an intelligent pressure compensation device and an intelligent control unit, a multi-stage pressure sensor, a pressure adjusting valve and an electric control proportional pressure reducing valve are arranged in the intelligent pressure compensation device, the oil pressure of the system is adjusted in a self-adaptive mode through the intelligent pressure compensation device, and the system is monitored and controlled through the intelligent control unit. An electronic control proportional valve group is arranged at the output end of the oil way, the chassis hydro-pneumatic suspension unit and the loading equipment hydraulic unit are connected through the electronic control proportional valve group, and hydraulic oil is distributed and conveyed into the chassis hydro-pneumatic suspension unit and the loading equipment hydraulic unit.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic systems, and more specifically, relates to an integrated multifunctional hydraulic system and a control method. Background Art

[0002] Hydraulic systems are widely used in chassis suspension systems and superstructure equipment in modern engineering vehicles, military vehicles, special vehicles, and various heavy machinery. Traditional design approaches often completely separate the chassis suspension system from the superstructure hydraulic system, each with its own independent hydraulic oil tank, hydraulic pump, control valve assembly, and piping system. While this design is simple and straightforward, avoiding interference between the two systems, it also presents numerous technical challenges.

[0003] First, independent hydraulic systems increase the overall weight of the vehicle or equipment. For vehicles or mobile equipment that require precise load control, excess weight reduces the payload ratio, increases fuel consumption, and may affect operational performance. Second, two complete hydraulic systems take up valuable space. For vehicles or equipment with limited space, this redundant design severely limits the placement of other functional components. Third, the design of independent hydraulic systems increases manufacturing and maintenance costs, requiring more hydraulic components and spare parts, and the maintenance workload. Finally, separate hydraulic systems cannot achieve optimal resource allocation. When one system is under high load and the other is idle, power resources cannot be properly allocated.

[0004] Currently, there are products on the market that attempt to partially integrate the chassis suspension system with the hydraulic unit of the superstructure, such as sharing a common fuel tank or power source. However, these simple integration designs often face technical challenges such as mismatched operating pressures, conflicting flow requirements, temperature control difficulties, cross-system contamination effects, and reduced reliability.

[0005] Therefore, how to achieve efficient sharing of hydraulic resources between the chassis oil-gas suspension and the upper equipment while ensuring that the performance of each system is not affected has become a technical problem that needs to be solved urgently. Summary of the Invention

[0006] In response to the above-mentioned defects or improvement needs of the prior art, the present invention provides an integrated multifunctional hydraulic system and control method, which controls the hydraulic oil state in the main oil circuit through an intelligent pressure compensation device and an intelligent control unit, and controls the pressure and diversion of the hydraulic oil in the two branch oil circuits through an electronically controlled proportional valve group, thereby realizing the sharing of the hydraulic oil tank and hydraulic pump of the chassis oil-gas suspension and the upper equipment, and realizing adaptive adjustment under different working conditions, thereby improving system efficiency and space utilization.

[0007] To achieve the above objectives, according to a first aspect of an embodiment of the present invention, there is provided an integrated multifunctional hydraulic system comprising a main hydraulic oil tank and a main hydraulic pump group; The main hydraulic oil tank stores hydraulic oil, and the main hydraulic pump group is connected to the main hydraulic oil tank to transport the hydraulic oil therein to the system through the oil circuit to provide hydraulic power; The output end of the main hydraulic pump group is provided with an intelligent pressure compensation device, through which the oil pressure of the system is adaptively adjusted; It also includes an intelligent pressure compensation device and an intelligent control unit. The intelligent pressure compensation device is equipped with a multi-stage pressure sensor, a pressure regulating valve and an electronically controlled proportional pressure reducing valve. The intelligent pressure compensation device is used to adaptively adjust the oil pressure of the system, and the intelligent control unit is used to monitor and control the system. An electronically controlled proportional valve group is provided at the output end of the oil circuit, through which the chassis oil-gas suspension unit and the upper equipment hydraulic unit are connected, and the hydraulic oil is diverted and transported to the chassis oil-gas suspension unit and the upper equipment hydraulic unit.

[0008] Furthermore, the intelligent pressure compensation device adopts a three-stage pressure compensation structure, including a mechanical pre-pressure compensation unit, an electro-hydraulic proportional compensation unit and an intelligent algorithm compensation unit.

[0009] Furthermore, the mechanical preload compensation unit adopts a spring preload structure to provide a basic pressure according to the system settings to cope with transient load changes; The electro-hydraulic proportional compensation unit includes an electrically controlled pressure reducing valve, which adjusts the system pressure according to the feedback signal of the pressure sensor to cope with the pressure demand change caused by the working condition switching; The intelligent algorithm compensation unit is based on deep learning and adaptive control algorithms. It achieves precise pressure control by predicting system pressure requirements and adjusting them in advance. It is implemented through an intelligent control unit, which uses historical data and real-time status information to establish a system pressure model, predict pressure change trends, and issue control instructions in advance to achieve predictive pressure adjustment.

[0010] Furthermore, the electronically controlled proportional valve group adopts a modular design, including a chassis control module and a superstructure control module. The two modules are connected to the intelligent control unit via a CAN bus to achieve information sharing and collaborative control.

[0011] Furthermore, the chassis control module is provided with an electronically controlled proportional flow valve and a directional control valve to control the flow and pressure of the hydraulic oil flowing to the chassis oil-gas suspension unit. The chassis control module has multiple working modes, including comfort mode, standard mode, sport mode and off-road mode, which adjusts the suspension characteristics according to the driving environment and driving requirements.

[0012] Further, the multi-stage filtering unit comprises a general-purpose coarse filtering unit, a chassis-specific fine filtering unit and an upper-loading-specific fine filtering unit. The general-purpose coarse filtering unit performs preliminary filtering on all hydraulic oils, and the chassis-specific fine filtering unit and the upper-loading-specific fine filtering unit perform secondary precise filtering on the hydraulic oils entering the respective systems respectively to prevent cross contamination between different systems.

[0013] Further, a fault isolation valve group is further included, which is also arranged in the oil circuit and adopts electromagnetic locking and mechanical double insurance design, and comprises an electromagnetic isolation valve, a mechanical locking valve, a pressure release valve and a hydraulic lock. The electromagnetic isolation valve adopts normally closed design, is opened when powered on and is automatically closed when powered off, and is installed in each hydraulic circuit. The mechanical locking valve adopts spring-loaded design, is installed on the hydraulic circuit and serves as a backup of the electromagnetic isolation valve, and is automatically locked when the system pressure is abnormal or the electric control system is completely disabled. The pressure release valve is installed in each isolation area and is used to release the pressure in the area after fault isolation.

[0014] According to a second aspect of the embodiment of the present application, a pressure self-adaptive compensation control method of an integrated multifunctional hydraulic system is provided, comprising the following steps: S100, system startup, entering the preheating stage, the mechanical pre-pressing compensation unit works to provide basic pressure support, the electro-hydraulic proportional compensation unit and the intelligent algorithm compensation unit are in standby state; S200, the system detects the current working condition, including the vehicle driving state, the upper-loading device working state and the environmental condition, based on the detection result, the system calculates the optimal pressure value required by each part; S300, the system compares the current pressure value with the target pressure value, calculates the pressure deviation, and decides which level of compensation unit to start according to the deviation size; S400, the system allocates pressure resources according to the working condition priority, in normal case, the chassis oil and gas suspension unit and the upper-loading device hydraulic unit obtain corresponding pressure resources according to their working requirements; in resource conflict, the system preferentially guarantees the pressure requirement of the safety-related system; S500, the system continuously monitors the pressure state and evaluates the compensation effect, if the compensation effect is not ideal, the system automatically adjusts the compensation parameters through the gain coefficient of the electro-hydraulic proportional compensation unit or the prediction model parameters of the intelligent algorithm compensation unit until the optimal compensation effect is achieved; S600, the system records the compensation process data, the intelligent algorithm compensation unit analyzes the historical compensation data, optimizes the prediction model and improves the accuracy and efficiency of future compensation.

[0015] According to a third aspect of an embodiment of the present invention, there is provided an intelligent flow distribution control method for an integrated multifunctional hydraulic system, specifically comprising the following steps: R100, the system obtains current working condition information, including vehicle driving status, upper equipment working status and operator input; R200, the system calculates the ideal flow requirements of each actuator based on working condition information. For the chassis oil-gas suspension unit, it considers the driving stability and comfort requirements; for the upper equipment hydraulic unit, it considers the operating efficiency and control accuracy requirements; R300, the system calculates the maximum available flow of the main hydraulic pump group, taking into account the rated parameters of the pump, the current speed and the influence of the oil temperature. If the maximum available flow is greater than or equal to the sum of the ideal flow requirements of each actuator, the system allocates resources according to the ideal flow; if the maximum available flow is less than the sum of the ideal requirements, the flow optimization allocation stage is entered; R400, traffic optimization allocation is based on fuzzy control algorithm and priority scheduling strategy. The system first sorts the actuators according to their priorities, and the actuators with high priorities get traffic resources first; R500, under the premise of ensuring the basic needs of high-priority actuators, the system optimizes the allocation of remaining flow according to fuzzy control rules; R600, the system executes the flow distribution instruction and adjusts the actual flow of each actuator through the electronically controlled proportional flow valve in the electronically controlled proportional valve group; The R700 system records traffic distribution data and uses it to optimize algorithms and analyze performance. The intelligent control unit analyzes historical distribution data, identifies patterns and anomalies, and optimizes the traffic distribution model to improve the accuracy and efficiency of future distribution.

[0016] According to a fourth aspect of an embodiment of the present invention, a fault isolation processing control method for an integrated multifunctional hydraulic system is provided, specifically comprising the following steps: G100, the system monitors the system status in real time through sensors, and immediately enters the fault analysis phase when an abnormal signal is detected; G200 and intelligent control unit perform fault diagnosis to determine the fault type, location and severity; G300, the system determines the fault level based on the fault diagnosis results; G400, for level 3 and level 4 faults, the system immediately performs fault isolation operations; G500, the system performs fault adaptive adjustments to maximize system available functions while ensuring safety; G600 system issues fault warnings to operators, including fault type, location, severity, and handling suggestions. Warning methods include audible and visual alarms, instrument displays, and human-computer interface prompts to ensure that operators are aware of system status in a timely manner. G700, the system sends fault information to the management center or the manufacturer's technical support department to request remote diagnosis and technical support. Remote technicians can view system data, conduct in-depth diagnosis, and provide professional treatment suggestions; G800, after the fault is eliminated, the system performs recovery operations.

[0017] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art: 1. The integrated multifunctional hydraulic system of the present invention controls the hydraulic oil state in the main oil circuit through an intelligent pressure compensation device and an intelligent control unit, and controls the pressure and flow of the hydraulic oil in the two branch oil circuits through an electronically controlled proportional valve group. This enables the chassis oil-gas suspension and the upper equipment to share the hydraulic oil tank and hydraulic pump, while also achieving adaptive adjustment under different working conditions, thereby improving system efficiency and space utilization.

[0018] 2. The intelligent pressure compensation device of the present invention adopts a three-stage pressure compensation structure, including a mechanical preload compensation unit, an electro-hydraulic proportional compensation unit and an intelligent algorithm compensation unit. It can automatically adjust the system pressure according to the different working requirements of the chassis suspension and the upper equipment, and solve the problem of conflicting pressure requirements of different equipment in the traditional shared system.

[0019] 3. The electronically controlled proportional valve assembly of this invention adopts a modular design, comprising a chassis control module and a superstructure control module. These two modules are connected to an intelligent control unit via a CAN bus, enabling information sharing and coordinated control. The chassis control module prioritizes driving safety, while the superstructure control module prioritizes operational efficiency. Intelligent algorithms enable dynamic optimization of resource allocation.

[0020] 4. The multi-stage filtration unit of this invention includes a universal coarse filter unit, a chassis-specific fine filter unit, and a bodywork-specific fine filter unit. The universal coarse filter unit performs preliminary filtration of all hydraulic oil, while the chassis-specific fine filter unit and the bodywork-specific fine filter unit each perform secondary fine filtration of the hydraulic oil entering their respective systems to prevent cross-contamination between different systems.

[0021] 5. The intelligent control unit of this invention adopts a redundant design, including a primary controller and a backup controller. If the primary controller fails, it automatically switches to the backup controller, ensuring high system reliability. The intelligent control unit has multiple built-in operating modes, including standard mode, economy mode, power mode, emergency mode, and maintenance mode, which can be switched automatically or manually according to usage needs.

[0022] 6. The energy recovery module of the present invention can capture the potential energy and kinetic energy generated during the descent or deceleration of the upper equipment, as well as the mechanical energy generated by the chassis suspension system when the road is bumpy, and convert it into hydraulic energy and store it in the accumulator. It can be released when needed to improve the energy efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of an integrated multifunctional hydraulic system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the working process of a multi-stage filtering unit of an integrated multifunctional hydraulic system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the working process of a temperature monitoring and control module of an integrated multifunctional hydraulic system according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the working process of a fault isolation valve group of an integrated multifunctional hydraulic system according to an embodiment of the present invention; Figure 5 This is a flow chart of a pressure adaptive compensation control method for an integrated multifunctional hydraulic system according to an embodiment of the present invention; Figure 6 This is a flow chart of an intelligent flow distribution control method for an integrated multifunctional hydraulic system according to an embodiment of the present invention; Figure 7 This is a flow chart of a fault isolation processing control method for an integrated multifunctional hydraulic system according to an embodiment of the present invention; Figure 8 The figure is a flow chart of an energy recovery control method for an integrated multifunctional hydraulic system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0025] Example 1 like Figure 1-4As shown, an embodiment of the present invention provides an integrated multifunctional hydraulic system, comprising a main hydraulic oil tank and a main hydraulic pump assembly. The main hydraulic oil tank stores hydraulic oil. The main hydraulic pump assembly is connected to the main hydraulic oil tank and delivers the hydraulic oil therein to the system via an oil circuit to provide hydraulic power. An intelligent pressure compensation device is provided at the output end of the main hydraulic pump assembly, which adaptively adjusts the system's oil pressure. The oil circuit is also provided with a multi-stage filtration unit, comprising an oil inlet filter, an oil return filter, and a precision filtration unit, which filters the hydraulic oil to ensure its cleanliness. The system also includes an intelligent pressure compensation device and an intelligent control unit. The intelligent pressure compensation device is equipped with a multi-stage pressure sensor, a pressure regulating valve, and an electronically controlled proportional pressure reducing valve. The intelligent pressure compensation device adaptively adjusts the system's oil pressure, and the intelligent control unit monitors and controls the system. An electronically controlled proportional valve group is provided at the output end of the oil circuit, which connects to the chassis oil-gas suspension unit and the superstructure hydraulic unit, delivering hydraulic oil to these units. The hydraulic oil status in the main oil circuit is controlled by an intelligent pressure compensation device and an intelligent control unit, and the pressure and diversion of the hydraulic oil in the two branch oil circuits are controlled by an electronically controlled proportional valve group. This allows the chassis oil-gas suspension and the upper equipment to share the hydraulic oil tank and hydraulic pump, while achieving adaptive adjustment under different working conditions, thereby improving system efficiency and space utilization.

[0026] It can be understood that the main oil circuit is the oil circuit from the main hydraulic oil tank to the electronically controlled proportional valve group, and the two branch oil circuits are the oil circuits from the electronically controlled proportional valve group to the chassis oil-gas suspension unit and the upper equipment hydraulic unit.

[0027] The main hydraulic oil tank is constructed from high-strength aluminum alloy and features multiple internal baffles, creating a semi-isolated structure. This prevents excessive sloshing of the hydraulic oil during high-angle tilting, ensuring system stability in all operating positions. The tank's capacity is determined to be 1.5-2 times the total system flow rate, based on the overall machine requirements. It is equipped with an oil suction and return filter, an oil level sensor, a temperature sensor, and a defoaming device. A breather is located on the top of the tank, and an oil drain port is located on the bottom, facilitating regular maintenance and oil replacement.

[0028] The main hydraulic pump assembly consists of a variable-displacement piston pump and a fixed-displacement gear pump. Driven by an engine or electric motor, the variable-displacement piston pump provides high-pressure, high-flow hydraulic power to the superstructure hydraulic unit. Its displacement automatically adjusts based on load demand. The fixed-displacement gear pump provides stable hydraulic pressure and flow to the chassis' hydro-pneumatic suspension unit, ensuring the stability and reliability of the suspension system. The design displacement of the main hydraulic pump assembly is determined by the system's maximum flow requirement, with a 20% margin reserved.

[0029] The chassis' hydro-pneumatic suspension unit includes a hydro-pneumatic spring, a damping adjustment device, and a leveling system. The hydro-pneumatic spring utilizes an oil-gas separation design, dynamically adjusting suspension stiffness by adjusting the pressure ratio of the internal hydraulic oil and nitrogen. The damping adjustment device utilizes electronically controlled variable damping technology, automatically adjusting damping characteristics based on road conditions and driving speed, enhancing ride comfort and stability. The leveling system adjusts vehicle height based on vehicle load to maintain optimal driving posture.

[0030] The bodywork hydraulic unit varies depending on the specific application of the vehicle or equipment and can be a hydraulic lifting system, a hydraulic drive system, a hydraulic operating system, or other hydraulic control system. Bodywork hydraulic units have high hydraulic pressure and flow requirements, operating at pressures of 16-315 MPa and requiring a high flow rate. This is significantly different from the operating pressure of a vehicle chassis' oil-pneumatic suspension unit, which operates at 10-25 MPa. The intelligent pressure compensation device and electronically controlled proportional valve assembly accommodate this pressure difference, meeting the needs of different systems.

[0031] The intelligent pressure compensation device utilizes a three-stage pressure compensation structure, comprising a mechanical preload compensation unit, an electro-hydraulic proportional compensation unit, and an intelligent algorithm compensation unit. The mechanical preload compensation unit utilizes a spring preload structure to provide a base pressure based on system settings. Its compensation range is ±10% of the system's rated pressure, addressing transient load fluctuations. A safety relief valve is installed within the mechanical preload compensation unit, automatically releasing pressure when system pressure exceeds a safe value to protect the system. The electro-hydraulic proportional compensation unit includes an electrically controlled pressure reducing valve that adjusts the system pressure based on feedback from a pressure sensor. Its compensation range is ±30% of the system's rated pressure, addressing pressure demand fluctuations caused by operating mode switching. The electro-hydraulic proportional compensation unit utilizes PWM control technology, enabling smooth pressure adjustment and avoiding system shocks. The intelligent algorithm compensation unit, based on deep learning and an adaptive control algorithm, achieves precise pressure control by predicting system pressure demand and adjusting it in advance. This is implemented through an intelligent control unit, which leverages historical data and real-time status information to establish a system pressure model, predict pressure trends, and issue control commands in advance for predictive pressure adjustment. The compensation range of the intelligent algorithm compensation unit is not restricted and can cope with the full range of working conditions from extremely low pressure to extremely high pressure.

[0032] The intelligent pressure compensation device also includes multiple pressure sensors distributed at key locations in the system to monitor the system pressure status in real time. These sensors use high-precision digital pressure sensors to provide accurate pressure feedback signals to the system.

[0033] Understandably, in the intelligent pressure compensation device, the mechanical preload compensation unit quickly responds to transient, small pressure fluctuations; the electro-hydraulic proportional compensation unit handles moderate pressure changes caused by operating mode switching; and the intelligent algorithm compensation unit proactively adjusts for predictable, large pressure changes or special operating conditions. This three-level structure ensures optimal pressure control under all operating conditions, while also guaranteeing system reliability and stability.

[0034] The electronically controlled proportional valve assembly adopts a modular design, comprising a chassis control module and a bodywork control module. These two modules are connected to an intelligent control unit via a CAN bus, enabling information sharing and coordinated control. The chassis control module ensures driving safety, while the bodywork control module ensures operational efficiency. Intelligent algorithms are used to dynamically optimize resource allocation. The chassis control module is equipped with an electronically controlled proportional flow valve and a directional control valve to control the flow and pressure of hydraulic oil to the chassis' hydro-pneumatic suspension unit. The chassis control module features multiple operating modes, including comfort, standard, sport, and off-road, to adjust suspension characteristics based on driving conditions and driving requirements. The chassis control module ensures driving safety, and its control strategy prioritizes stability and reliability. The bodywork control module is equipped with a multi-way valve, an electronically controlled proportional flow valve, and a directional control valve to control the flow and direction of hydraulic oil to the hydraulic unit of the bodywork equipment. The bodywork control module designs different control strategies based on the specific type of bodywork equipment and operational requirements to ensure operational efficiency and control accuracy. The bodywork control module supports multi-task parallel control, capable of simultaneously controlling the coordinated operation of multiple actuators.

[0035] As a further preferred feature, the electrically controlled proportional flow valve utilizes direct-acting electromagnetic proportional control technology, achieving a control accuracy of ±2% of the rated flow rate, enabling precise control of the hydraulic oil flow rate. The directional control valve utilizes electromagnetic reversing technology, enabling rapid directional control of the hydraulic actuator. The multi-way valve utilizes electro-hydraulic pilot control technology, integrating multiple independent control circuits and enabling simultaneous control of multiple actuators, simplifying the system structure and improving control efficiency.

[0036] It's understood that the electronically controlled proportional valve group, based on fuzzy control theory and a priority scheduling strategy, dynamically allocates hydraulic resources according to vehicle status and operational requirements. Under standard operating conditions, the algorithm balances hydraulic resources to ensure proper operation of all systems. In emergencies, the algorithm prioritizes the hydraulic needs of safety-related systems. Under high-load conditions, the algorithm rationally allocates restricted resources based on operational priorities to maximize overall system efficiency.

[0037] The multi-stage filtration unit includes a universal coarse filter unit, a chassis-specific fine filter unit, and a bodywork-specific fine filter unit. The universal coarse filter unit performs preliminary filtration of all hydraulic oil, while the chassis-specific fine filter unit and the bodywork-specific fine filter unit each perform secondary fine filtration of the hydraulic oil entering their respective systems to prevent cross-contamination between different systems.

[0038] The universal coarse filter unit is located at the oil outlet of the main hydraulic oil tank, and performs preliminary filtration on all hydraulic oils. It has a large impurity holding capacity and low flow resistance, ensuring that the system can obtain sufficient hydraulic oil supply under various working conditions. The universal coarse filter unit is provided with a bypass valve, which automatically opens the bypass channel when the filter element is clogged to prevent the system from being short of oil due to filtration. The chassis-specific fine filter unit is located on the pipeline flowing to the chassis oil-gas suspension unit, and performs secondary fine filtration on the hydraulic oil entering the chassis system. The chassis-specific fine filter unit adopts a stainless steel mesh filter element, which has good impact resistance and self-cleaning ability, and is suitable for the long-term stable operation of the chassis system. The upper-mounted special fine filter unit is located on the pipeline flowing to the hydraulic unit of the upper-mounted equipment, and performs secondary fine filtration on the hydraulic oil entering the upper-mounted system. The upper-mounted special fine filter unit has extremely high filtration efficiency and good adsorption capacity, and can effectively remove tiny particles and colloidal substances in the hydraulic oil, protecting the normal operation of the precision hydraulic components in the upper-mounted equipment.

[0039] The multi-stage filtration unit also includes a filtration status monitoring device that monitors the operating status and clogging level of each filtration unit in real time. This filtration status monitoring device uses differential pressure sensor technology to determine the degree of filter clogging by measuring the pressure difference across the filter element. When the pressure difference exceeds a preset value, the intelligent control unit prompts the operator to replace the filter element.

[0040] As you can see, the layered filtration design of the multi-stage filter unit not only improves the system's filtration efficiency but, more importantly, solves the problem of cross-contamination between different components in traditional shared hydraulic systems. Chassis oil-pneumatic suspension units and bodywork hydraulic units have distinct operating characteristics and environmental conditions, generating distinct types of contaminants. By designing dedicated fine filtration units, each system receives filtration protection tailored to its specific characteristics, effectively extending the service life of hydraulic components and improving system reliability.

[0041] The multifunctional hydraulic system of an embodiment of the present invention also includes a temperature monitoring and control module, which is arranged in the oil circuit and adopts a regional differentiated control strategy, including a temperature sensor, a cooling unit, a heating unit and a temperature controller. The distribution locations of the temperature sensors include the main hydraulic oil tank, the backup hydraulic oil tank, the outlet of the main hydraulic pump group, the chassis oil-gas suspension unit and the hydraulic unit of the upper equipment. The temperature sensor adopts a digital thermistor to provide accurate temperature feedback signals for the system. The cooling unit includes a hydraulic oil radiator and an electronically controlled fan, which are installed on the system return oil pipeline. The hydraulic oil radiator adopts a high-efficiency aluminum alloy fin structure with a large heat dissipation area and high heat exchange efficiency. The electronically controlled fan adopts a variable speed design, which can automatically adjust the speed according to temperature requirements, reducing energy consumption and noise while ensuring the cooling effect. The heating unit includes an electric heater and a PTC thermistor, which is installed inside the main hydraulic oil tank and can quickly increase the temperature of the hydraulic oil in a low temperature environment. The PTC thermistor has a self-limiting temperature characteristic, which can prevent the hydraulic oil from overheating and improve the safety of the system. The temperature controller utilizes a PID control algorithm to control the operating states of the cooling and heating units based on feedback from the temperature sensor, achieving precise control of the hydraulic oil temperature. The temperature controller features multiple temperature control thresholds, including a minimum startup temperature, an optimal operating temperature range, a warning temperature, and a maximum safety temperature, automatically adjusting the control strategy based on varying operating conditions.

[0042] It's understandable that the temperature monitoring and control module's regionally differentiated control strategy is a key innovation of this invention. Traditional hydraulic systems typically employ a unified temperature control strategy, which fails to meet the diverse temperature requirements of different components. This invention divides the system into multiple temperature control zones, with independent temperature control circuits for the chassis oil-gas suspension unit and the bodywork hydraulic unit. This allows for precise control tailored to the temperature characteristics of each system. For example, the chassis oil-gas suspension unit has an optimal operating temperature range of 40-60°C, while the bodywork hydraulic unit has an optimal operating temperature range of 50-70°C. This regionally differentiated control strategy addresses these differentiated requirements, ensuring that each system operates at its optimal temperature. Furthermore, the temperature monitoring and control module features an environmental adaptability function, automatically adjusting its control strategy based on the ambient temperature. In cold environments, the system prioritizes activating the heating unit to quickly raise the hydraulic oil temperature; in hot environments, the system preemptively activates the cooling unit to prevent overheating of the hydraulic oil. This intelligent temperature control strategy ensures stable system operation in a variety of environmental conditions.

[0043] The intelligent control unit utilizes a redundant design, comprising a main controller, a backup controller, a human-machine interface (HMI), a data storage unit, and a communication module. The main controller is capable of handling complex control algorithms and multiple tasks in parallel. It is responsible for daily system control and supervision, including pressure control, flow distribution, temperature regulation, and fault diagnosis. The backup controller utilizes the same hardware platform as the main controller but runs a simplified version of the control software, focusing on the system's core safety functions. The backup controller maintains data synchronization with the main controller and automatically takes over system control in the event of a main controller failure, ensuring continued safe operation with minimal transition time and normal operation of the basic system. The HMI, consisting of an LCD display and multi-function buttons, is located at the operator's access point. The LCD display features a high-brightness, anti-glare design for clear display even in bright sunlight. The multi-function buttons are ergonomically designed for excellent feel and operational feedback. The HMI offers multi-language support and a multi-level menu system, allowing operators to easily view system status, set operating parameters, obtain fault information, and perform maintenance operations. The data storage unit utilizes an industrial-grade solid-state drive (SSD), which supports high-speed data read and write and is vibration-resistant. The data storage unit is responsible for recording system operating data, fault information, and maintenance records, providing a basis for system optimization and fault diagnosis. The data storage unit uses a cyclic overwrite method to record data, ensuring that the most valuable information is retained within the limited storage space. The communication module supports communication protocols including CAN bus, RS485, Ethernet, and Bluetooth. CAN bus is used for communication between internal system components, RS485 is used for wired communication with external devices, Ethernet is used for high-speed data transmission and remote monitoring, and Bluetooth is used for short-range wireless communication and mobile device connectivity. The communication module also uses multi-level encryption technology to ensure the security and reliability of data transmission.

[0044] As a further preference, the intelligent control unit has multiple built-in operating modes, including standard mode, economic mode, power mode, emergency mode and maintenance mode. In standard mode, the system balances performance and energy efficiency, which is suitable for daily work; in economic mode, the system prioritizes energy conservation, which is suitable for light-load conditions; in power mode, the system prioritizes performance output, which is suitable for heavy-load conditions; in emergency mode, the system focuses on maintaining key functions, which is suitable for emergency situations; in maintenance mode, the system supports independent testing and adjustment of each component, making it easier for maintenance personnel to perform system maintenance. The operator can manually switch the operating mode as needed, and the system will automatically recommend the optimal mode based on the working status.

[0045] The multifunctional hydraulic system of the embodiment of the application further comprises a fault isolation valve group, which is also arranged in the oil circuit and adopts an electromagnetic locking and mechanical double insurance design, and comprises an electromagnetic isolation valve, a mechanical locking valve, a pressure release valve and a hydraulic lock. The electromagnetic isolation valve adopts a normally closed design, is opened when powered on and is automatically closed when powered off, and is installed in each hydraulic circuit. The electromagnetic isolation valve has a short response time, can rapidly isolate the fault area after a fault occurs, and prevents the fault from spreading. Moreover, the electromagnetic isolation valve also has a manual operation function, and can be opened or closed through manual operation when the electric control system fails. The mechanical locking valve adopts a spring-loaded design, is installed on a key safety circuit, and serves as a backup of the electromagnetic isolation valve. When the system pressure is abnormal or the electric control system completely fails, the mechanical locking valve is automatically locked to prevent dangerous situations from occurring. The mechanical locking valve has a manual reset function, and can restore the system through manual operation after the fault is eliminated. The pressure release valve is installed in each isolation area, is used to release the pressure in the area after fault isolation, and avoids secondary faults caused by pressure accumulation. The pressure release valve adopts proportional control technology, can slowly release the pressure as needed, and prevents shocks caused by pressure surges. The hydraulic lock is installed on an actuator, is used to lock the position of the actuator in the case of system pressure loss, and prevents accidental movement. The hydraulic lock adopts a bidirectional locking design, can reliably lock the actuator at any position, and ensures the safety of the equipment.

[0046] As a further preferred, the fault isolation valve group also has a fault level identification function, can take different isolation strategies according to the severity of the fault. For a minor fault, the system only isolates the minimum necessary range to ensure normal work of other parts; for a serious fault, the system adopts a comprehensive isolation strategy to ensure the safety of the entire machine. This flexible isolation strategy improves the availability and work efficiency of the system.

[0047] It can be understood that the working principle of the fault isolation valve group is that when the system detects a fault, the intelligent control unit immediately issues an isolation instruction, the electromagnetic isolation valve is quickly closed to isolate the fault area from the rest of the system; at the same time, the pressure release valve starts to slowly release the pressure in the fault area, and the hydraulic lock locks the related actuator. If the fault further deteriorates or the electric control system fails, the mechanical locking valve will automatically serve as the last line of defense to lock the system. This multiple insurance design ensures the safety and reliability of the system under various fault conditions.

[0048] The multifunctional hydraulic system of an embodiment of the present invention also includes an energy recovery module, which includes a hydraulic accumulator, a check valve, an energy converter, and an energy management controller. The hydraulic accumulator adopts a bladder design and is filled with nitrogen as an elastic medium. When receiving high-pressure hydraulic oil, the nitrogen is compressed and stores energy. When the system requires additional power, the nitrogen expands, releasing energy and driving the hydraulic oil to the required actuators. The hydraulic accumulator has high energy density and fast response characteristics, which can effectively balance the system load peaks. The check valve is installed in the energy recovery pipeline to ensure unidirectional energy flow and prevent the loss of recovered energy. The check valve adopts a low pressure drop design to ensure high energy recovery efficiency. The energy converter is the core component of the energy recovery module and adopts a bidirectional hydraulic pump / motor design. During the energy recovery phase, the energy converter operates as a hydraulic motor, converting the mechanical energy of the oil-gas suspension system or the potential energy of the superstructure into hydraulic energy. During the energy release phase, the energy converter operates as a hydraulic pump, converting the stored hydraulic energy into mechanical energy. The high conversion efficiency of the energy converter significantly improves the energy utilization efficiency of the system. The energy management controller is based on a fuzzy control algorithm and is responsible for coordinating energy recovery and release to ensure optimal utilization of system energy. It decides when to recover energy, how much energy to recover, when to release energy, and how much energy to release based on the system's operating status and energy requirements, thereby realizing intelligent management of energy utilization.

[0049] As you can see, the energy recovery module captures two types of energy: the mechanical energy generated by the chassis's hydropneumatic suspension unit when the road is bumpy, and the potential and kinetic energy generated by the superstructure's hydraulic unit during lowering or deceleration. For example, on a heavy-duty crane, when the boom descends, the energy that would otherwise be consumed by the radiator can be recovered and stored in the hydraulic accumulator, which can then be released during the next lifting operation, reducing the burden on the main hydraulic pump unit and improving energy efficiency.

[0050] The multifunctional hydraulic system of an embodiment of the present invention is equipped with a self-diagnosis and predictive maintenance module, which includes status detection sensors, a data analysis unit, a life prediction module, and a maintenance recommendation generator. The status detection sensors, including pressure sensors, temperature sensors, flow sensors, vibration sensors, and oil contamination sensors, are distributed throughout the system to monitor system operating status in real time. These sensors are digitally designed, offering high precision, high reliability, and self-test capabilities, providing comprehensive system status data. The data analysis unit utilizes big data analytics technology to process sensor data and identify system operating modes and abnormal conditions. It incorporates multiple anomaly detection algorithms, including statistical analysis, spectral analysis, trend analysis, and pattern recognition, enabling identification of weak abnormal signals before a failure occurs, providing a basis for preventive maintenance. The life prediction module, based on Remaining Life (RUL) estimation technology, predicts the remaining useful life of system components based on their operating conditions and wear status. It incorporates multiple fault progression models, including linear, exponential, and physics-based models, enabling selection of appropriate prediction models based on the characteristics of different components to improve prediction accuracy. The maintenance recommendation generator, based on expert system technology, generates specific maintenance recommendations based on system status and lifespan predictions. These recommendations include the maintenance time, maintenance items, required spare parts, estimated work hours, and operational steps, providing detailed guidance to maintenance personnel. The maintenance recommendation generator also features a prioritization function that ranks maintenance tasks by urgency and importance, helping maintenance personnel plan their work more effectively.

[0051] Understandably, the core of the self-diagnosis and predictive maintenance module is a predictive maintenance strategy, which involves performing maintenance based on the actual condition of the equipment rather than a fixed cycle. This strategy can avoid unnecessary maintenance activities and reduce maintenance costs. It can also promptly detect potential failures, prevent unplanned downtime, and improve equipment availability.

[0052] The multifunctional hydraulic system of this embodiment also includes a remote monitoring and cloud diagnostic interface, comprising a data acquisition unit, a wireless communication module, a cloud interface, and a remote control module. The data acquisition unit is responsible for collecting system operating data, including operating status, performance parameters, fault information, and maintenance records. The data acquisition unit employs a hierarchical data acquisition strategy, with different acquisition frequencies based on data importance and frequency of change, ensuring the real-time availability of important data while avoiding data redundancy. The wireless communication module supports multiple wireless communication technologies, including 4G / 5G mobile networks, satellite communications, and WiFi. In areas with good signal coverage, the system prioritizes 4G / 5G networks, which offer high speed and low cost. In areas with poor or no coverage, the system automatically switches to satellite communication mode to ensure communication continuity. The wireless communication module employs reliable data encryption and authentication mechanisms to ensure the security of data transmission. The cloud interface is responsible for data exchange with the cloud platform, supporting data upload, command download, and software updates. The cloud interface utilizes a standardized API design, enabling integration with different cloud platforms and offering excellent compatibility and scalability. The cloud interface also supports breakpoint resuming and data compression technologies to improve data transmission efficiency and reliability. The remote control module allows authorized personnel to remotely control the system, including parameter adjustment, mode switching, fault reset and emergency shutdown. The remote control module adopts a multi-level security authentication mechanism to ensure that only authorized personnel can perform remote control operations. The remote control module also has an operation log recording function, which records all remote operations to facilitate subsequent audits and problem tracing. The core advantage of the remote monitoring and cloud diagnostic interface is that it realizes the digital transformation of equipment management. Through this interface, equipment managers can understand the working status of all equipment in real time, discover and solve problems in a timely manner; technical experts can remotely diagnose complex faults and provide professional technical support without on-site business trips; manufacturers can collect equipment usage data, optimize product design, and provide better after-sales service.

[0053] In actual applications, remote monitoring and cloud diagnostic interfaces have significantly improved equipment management efficiency and reduced maintenance costs and downtime.

[0054] The multifunctional hydraulic system of the embodiment of the present invention also includes a spare hydraulic oil tank and an auxiliary hydraulic pump. The spare hydraulic oil tank is connected to the main hydraulic oil tank through a hydraulic pipeline and adopts an elastic diaphragm design, which can automatically replenish hydraulic oil when the liquid level in the main hydraulic oil tank is insufficient. A fine filter is provided inside the spare hydraulic oil tank to ensure that the replenished hydraulic oil is clean and free of impurities. The spare hydraulic oil tank is also equipped with an oil level sensor. When the oil level is lower than the preset value, a prompt is issued to the operator through the intelligent control unit to remind him to replenish the hydraulic oil in time. The auxiliary hydraulic pump is connected to the spare hydraulic oil tank and adopts a small electric pump design. It can be driven by the vehicle power supply or an independent power supply. The auxiliary hydraulic pump automatically starts in the event of a failure of the main hydraulic pump group or a load peak, providing the necessary hydraulic power to the critical system to ensure system safety. The design pressure and flow of the auxiliary hydraulic pump are usually 30-50% of the system rating, which is sufficient to maintain the basic operation of critical functions.

[0055] Example 2 like Figure 5 As shown, an embodiment of the present invention provides a pressure adaptive compensation control method for an integrated multifunctional hydraulic system, which specifically includes the following steps: S100, the system starts and enters the preheating stage. The mechanical preload compensation unit works to provide basic pressure support. The electro-hydraulic proportional compensation unit and the intelligent algorithm compensation unit are on standby. S200: The system detects the current working conditions, including the vehicle's driving state, the working state of the upper equipment, and the environmental conditions. Based on the detection results, the system calculates the optimal pressure value required for each part; S300, the system compares the current pressure value with the target pressure value, calculates the pressure deviation, and decides which level of compensation unit to start based on the deviation; S400: The system allocates pressure resources based on the priority of the working conditions. Under normal circumstances, the chassis oil-gas suspension unit and the upper equipment hydraulic unit obtain corresponding pressure resources according to their working requirements. In the event of resource conflict, the system prioritizes the pressure requirements of safety-related systems. S500, the system continuously monitors the pressure status and evaluates the compensation effect. If the compensation effect is not ideal, the system automatically adjusts the compensation parameters through the gain coefficient of the electro-hydraulic proportional compensation unit or the prediction model parameters of the intelligent algorithm compensation unit until the best compensation effect is achieved; S600, the system records compensation process data, and the intelligent algorithm compensation unit analyzes historical compensation data, optimizes the prediction model, and improves the accuracy and efficiency of future compensation.

[0056] In step S300, the specific method for judging whether to start the compensation unit is as follows: if the deviation is less than ±10% of the system rated pressure, only the mechanical preload compensation unit is started; if the deviation is between ±10% and ±30% of the system rated pressure, both the mechanical preload compensation unit and the electro-hydraulic proportional compensation unit are started; if the deviation exceeds ±30% of the system rated pressure, or a large pressure change is expected, the three-level compensation system is fully started, including the intelligent algorithm compensation unit.

[0057] Example 3 like Figure 6 As shown, an embodiment of the present invention provides an intelligent flow distribution control method for an integrated multifunctional hydraulic system, which specifically includes the following steps: R100, the system obtains current working condition information, including vehicle driving status, upper equipment working status and operator input; R200, the system calculates the ideal flow requirements of each actuator based on working condition information. For the chassis oil-gas suspension unit, it considers the driving stability and comfort requirements; for the upper equipment hydraulic unit, it considers the operating efficiency and control accuracy requirements; R300, the system calculates the maximum available flow of the main hydraulic pump group, taking into account the rated parameters of the pump, the current speed and the influence of the oil temperature. If the maximum available flow is greater than or equal to the sum of the ideal flow requirements of each actuator, the system allocates resources according to the ideal flow; if the maximum available flow is less than the sum of the ideal requirements, the flow optimization allocation stage is entered; R400, traffic optimization allocation is based on fuzzy control algorithm and priority scheduling strategy. The system first sorts the actuators according to their priorities, and the actuators with high priorities get traffic resources first; R500, under the premise of ensuring the basic needs of high-priority actuators, the system optimizes the allocation of remaining flow according to fuzzy control rules; R600, the system executes the flow distribution instruction and adjusts the actual flow of each actuator through the electronically controlled proportional flow valve in the electronically controlled proportional valve group; The R700 system records traffic distribution data and uses it to optimize algorithms and analyze performance. The intelligent control unit analyzes historical distribution data, identifies patterns and anomalies, and optimizes the traffic distribution model to improve the accuracy and efficiency of future distribution.

[0058] In step R100, the vehicle driving state includes speed, acceleration and steering angle, the upper equipment working state includes working mode, load size and actuator position, and the operator input includes operating lever position and button status.

[0059] In step R400 , the priority is determined by the safety importance, functional criticality, and operational urgency of the actuators. Specifically, the steering system has the highest priority, followed by the suspension system, and then the operating system.

[0060] In step R500, the fuzzy control rules calculate the optimal flow distribution ratio based on the response characteristics, load status and performance requirements of the actuators to maximize the overall system performance under limited resources.

[0061] In step R600, the system also continuously monitors the response of each actuator, evaluates the flow distribution effect, and dynamically adjusts the distribution strategy as needed.

[0062] In step R700, the intelligent control unit analyzes historical allocation data, identifies patterns and anomalies, optimizes the traffic allocation model, and improves the accuracy and efficiency of future allocations.

[0063] The intelligent flow distribution control method in this embodiment solves the problem of flow resource competition in traditional shared hydraulic systems, achieving optimal allocation of limited flow resources and improving the overall efficiency and responsiveness of the system. Especially under complex operating conditions, the algorithm can dynamically adjust the flow distribution strategy based on real-time demand, ensuring optimal system performance.

[0064] Example 4 like Figure 7 As shown, an embodiment of the present invention provides a fault isolation processing control method for an integrated multifunctional hydraulic system, which specifically includes the following steps: G100, the system monitors the system status in real time through sensors, and immediately enters the fault analysis phase when an abnormal signal is detected; G200 and intelligent control unit perform fault diagnosis to determine the fault type, location and severity; G300, the system determines the fault level based on the fault diagnosis results; G400, for level 3 and level 4 faults, the system immediately performs fault isolation operations; G500, the system performs fault adaptive adjustments to maximize system available functions while ensuring safety; G600 system issues fault warnings to operators, including fault type, location, severity, and handling suggestions. Warning methods include audible and visual alarms, instrument displays, and human-computer interface prompts to ensure that operators are aware of system status in a timely manner. G700, the system sends fault information to the management center or the manufacturer's technical support department to request remote diagnosis and technical support. Remote technicians can view system data, conduct in-depth diagnosis, and provide professional treatment suggestions; G800, after the fault is eliminated, the system performs recovery operations.

[0065] In step G200, the fault diagnosis is based on a rule base and case-based reasoning, combined with historical fault data and expert experience, and can quickly and accurately identify common faults.

[0066] In step G300, the fault level is divided into four levels, specifically: Level 1 fault: a minor anomaly that does not affect the normal operation of the system and only needs to be recorded and handled during the next maintenance; Level 2 fault: A moderate abnormality that may affect system performance but does not endanger safety. It is necessary to adjust the working mode and arrange maintenance in the near future. Level 3 fault: A serious abnormality affects some system functions and requires isolating the fault area and restricting the use of related functions; Level 4 fault: Dangerous abnormality that may lead to a safety accident. It is necessary to immediately isolate the fault area and stop related operations.

[0067] In step G400, the specific steps of performing the fault isolation operation are as follows: G401, the intelligent control unit issues an isolation command to close the electromagnetic isolation valve in the fault area; G402, the pressure relief valve begins to slowly release the pressure in the fault area; G403, hydraulic lock locks the relevant actuators to prevent accidental movement; G404: If necessary, the mechanical locking valve will automatically lock as the last line of defense.

[0068] In step G500, the maximization of system available functions is specifically as follows: (1) switching to a working mode suitable for the current state, such as emergency mode or degraded mode; (2) adjusting system parameters, such as reducing working pressure or limiting flow, to reduce the pressure on faulty components; (3) reallocating system resources to prioritize the normal operation of key functions.

[0069] In step G800, the specific steps are as follows: G801, confirm that the fault has been eliminated and the system status is normal; G802, gradually open the electromagnetic isolation valve to restore the hydraulic supply; G803, release the hydraulic lock and allow the actuator to move normally; G804, reset fault warning and restore normal working mode.

[0070] The fault isolation and control method implemented in this embodiment of the present invention is highly automated and intelligent, capable of responding within milliseconds after a fault occurs, rapidly isolating the fault, preventing the spread of danger, and maximizing the safety of equipment and personnel. Furthermore, the process is flexible and adaptable, enabling the implementation of different handling strategies based on the nature of the fault, maximizing system availability while ensuring safety.

[0071] Example 5 like Figure 8 As shown, an embodiment of the present invention provides an energy recovery control method for an integrated multifunctional hydraulic system, which specifically includes the following steps: The T100 system monitors energy recovery opportunities in real time and categorizes them into two main types: mechanical energy generated by the chassis's hydropneumatic suspension unit during road bumps; and potential and kinetic energy generated by the bodywork's hydraulic unit during descent or deceleration. T200: The system evaluates the quality and quantity of recovered energy, taking into account the energy size, duration, and stability. For unstable or small energy, recovery is abandoned to avoid system losses caused by frequent switching. T300: The system checks the current status of the hydraulic accumulator, including pressure level and remaining capacity. If the accumulator is close to full rated pressure, the system reduces or stops energy recovery; if the accumulator pressure is low, the system increases recovery efforts. T400, the system calculates the optimal recovery strategy, including recovery time, recovery intensity, and recovery path, based on the characteristics of recovered energy and the state of the accumulator. The goal of the optimal strategy is to maximize energy recovery efficiency while ensuring the normal operation of the system; T500, the system performs energy recovery operation; T600, the system monitors the energy recovery process in real time to ensure that the recovery process does not affect the normal operation of the actuator; T700, the system evaluates current energy demand and decides whether to release stored energy; T800: If it is decided to release energy, the system executes the energy release operation; T900, the system records energy recovery and release data, conducts efficiency analysis and strategy optimization, and the energy management controller analyzes historical data, optimizes recovery and release strategies, and improves energy utilization efficiency.

[0072] In step T500, the energy recovery step is specifically as follows: T501. Adjust relevant control valves and establish energy recovery channels; T502. Control the working state of the energy converter to convert mechanical energy or hydraulic energy into storable hydraulic energy; T503, stores the recovered energy in a hydraulic accumulator.

[0073] In step T600, the specific operation is: during the descent of the upper equipment, the system balances the recovery force and the descent speed to ensure that the descent process is smooth and controllable.

[0074] In step T700, the energy demand comes from the following situations: system load peak, such as starting or rapid acceleration of the upper equipment; the main hydraulic pump group is overloaded and requires auxiliary power; the system enters energy-saving mode and gives priority to using stored energy.

[0075] In step T800, the energy release operation specifically includes the following steps: T801. Adjust relevant control valves to establish energy release channels; T802, control the hydraulic accumulator to release pressure and drive the energy converter; T803. Supply the released energy to the required actuators.

[0076] The energy recovery control method of the embodiment of the present invention is an intelligent energy management solution that can effectively capture and utilize excess energy generated during system operation, improve the energy utilization efficiency of the system, and reduce energy consumption and emissions.

[0077] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An integrated multifunctional hydraulic system, characterized in that: Including main hydraulic oil tank and main hydraulic pump group; The main hydraulic oil tank stores hydraulic oil, and the main hydraulic pump group is connected to the main hydraulic oil tank to transport the hydraulic oil therein to the system through the oil circuit to provide hydraulic power; The output end of the main hydraulic pump group is provided with an intelligent pressure compensation device, through which the oil pressure of the system is adaptively adjusted; It also includes an intelligent pressure compensation device and an intelligent control unit. The intelligent pressure compensation device is equipped with a multi-stage pressure sensor, a pressure regulating valve and an electronically controlled proportional pressure reducing valve. The intelligent pressure compensation device is used to adaptively adjust the oil pressure of the system, and the intelligent control unit is used to monitor and control the system. An electronically controlled proportional valve group is provided at the output end of the oil circuit, through which the chassis oil-gas suspension unit and the upper equipment hydraulic unit are connected, and the hydraulic oil is diverted and transported to the chassis oil-gas suspension unit and the upper equipment hydraulic unit.

2. The integrated multifunctional hydraulic system according to claim 1, characterized in that: The intelligent pressure compensation device adopts a three-stage pressure compensation structure, including a mechanical pre-pressure compensation unit, an electro-hydraulic proportional compensation unit and an intelligent algorithm compensation unit.

3. The integrated multifunctional hydraulic system according to claim 2, characterized in that: The mechanical preload compensation unit adopts a spring preload structure to provide a basic pressure according to the system settings to cope with transient load changes; The electro-hydraulic proportional compensation unit includes an electrically controlled pressure reducing valve, which adjusts the system pressure according to the feedback signal of the pressure sensor to cope with the pressure demand change caused by the working condition switching; The intelligent algorithm compensation unit is based on deep learning and adaptive control algorithms. It achieves precise pressure control by predicting system pressure requirements and adjusting them in advance. It is implemented through an intelligent control unit, which uses historical data and real-time status information to establish a system pressure model, predict pressure change trends, and issue control instructions in advance to achieve predictive pressure adjustment.

4. An integrated multifunctional hydraulic system according to any one of claims 1 to 3, characterized in that: The electronically controlled proportional valve group adopts a modular design, including a chassis control module and a superstructure control module. The two modules are connected to the intelligent control unit via a CAN bus to achieve information sharing and collaborative control.

5. The integrated multifunctional hydraulic system according to claim 4, characterized in that: The chassis control module is equipped with an electronically controlled proportional flow valve and a directional control valve to control the flow and pressure of the hydraulic oil flowing to the chassis oil-gas suspension unit. The chassis control module has multiple working modes, including comfort mode, standard mode, sport mode and off-road mode, which adjusts the suspension characteristics according to the driving environment and driving requirements.

6. An integrated multifunctional hydraulic system according to any one of claims 1 to 3, characterized in that: The multi-stage filtration unit includes a universal coarse filtration unit, a chassis-specific fine filtration unit, and a body-specific fine filtration unit; The universal coarse filter unit performs preliminary filtration on all hydraulic oils, and the chassis-specific fine filter unit and the body-specific fine filter unit respectively perform secondary fine filtration on the hydraulic oil entering their respective systems to prevent cross contamination between different systems.

7. An integrated multifunctional hydraulic system according to any one of claims 1 to 3, characterized in that: It also includes a fault isolation valve group, which is also arranged in the oil circuit and adopts an electromagnetic locking and mechanical dual insurance design, including an electromagnetic isolation valve, a mechanical locking valve, a pressure relief valve and a hydraulic lock; The electromagnetic isolation valve adopts a normally closed design, opens when power is on, and automatically closes when power is off, and is installed in each hydraulic circuit; The mechanical locking valve is spring-loaded and installed in the hydraulic circuit as a backup for the electromagnetic isolation valve. When the system pressure is abnormal or the electronic control system fails completely, the mechanical locking valve automatically locks. The pressure relief valve is installed in each isolated area and is used to release the pressure in the area after the fault is isolated.

8. A pressure adaptive compensation control method for an integrated multifunctional hydraulic system according to any one of claims 1 to 7, characterized in that: The following steps are involved: S100, the system starts and enters the preheating stage. The mechanical preload compensation unit works to provide basic pressure support. The electro-hydraulic proportional compensation unit and the intelligent algorithm compensation unit are on standby. S200: The system detects the current working conditions, including the vehicle's driving state, the working state of the upper equipment, and the environmental conditions. Based on the detection results, the system calculates the optimal pressure value required for each part; S300, the system compares the current pressure value with the target pressure value, calculates the pressure deviation, and decides which level of compensation unit to start based on the deviation; S400: The system allocates pressure resources based on the priority of the working conditions. Under normal circumstances, the chassis oil-gas suspension unit and the upper equipment hydraulic unit obtain corresponding pressure resources according to their working requirements. In the event of resource conflict, the system prioritizes the pressure requirements of safety-related systems. S500, the system continuously monitors the pressure status and evaluates the compensation effect. If the compensation effect is not ideal, the system automatically adjusts the compensation parameters through the gain coefficient of the electro-hydraulic proportional compensation unit or the prediction model parameters of the intelligent algorithm compensation unit until the best compensation effect is achieved; S600, the system records compensation process data, and the intelligent algorithm compensation unit analyzes historical compensation data, optimizes the prediction model, and improves the accuracy and efficiency of future compensation.

9. An intelligent flow distribution control method for an integrated multifunctional hydraulic system according to any one of claims 1 to 7, characterized in that: The specific steps include: R100, the system obtains current working condition information, including vehicle driving status, upper equipment working status and operator input; R200, the system calculates the ideal flow requirements of each actuator based on working condition information. For the chassis oil-gas suspension unit, it considers the driving stability and comfort requirements; for the upper equipment hydraulic unit, it considers the operating efficiency and control accuracy requirements; R300, the system calculates the maximum available flow of the main hydraulic pump group, taking into account the rated parameters of the pump, the current speed and the influence of the oil temperature. If the maximum available flow is greater than or equal to the sum of the ideal flow requirements of each actuator, the system allocates resources according to the ideal flow; If the maximum available flow is less than the sum of the ideal demands, the flow optimization allocation phase begins; R400, traffic optimization allocation is based on fuzzy control algorithm and priority scheduling strategy. The system first sorts the actuators according to their priorities, and the actuators with high priorities get traffic resources first; R500, under the premise of ensuring the basic needs of high-priority actuators, the system optimizes the allocation of remaining flow according to fuzzy control rules; R600, the system executes the flow distribution instruction and adjusts the actual flow of each actuator through the electronically controlled proportional flow valve in the electronically controlled proportional valve group; R700, the system records traffic distribution data and performs algorithm optimization and performance analysis based on the traffic distribution data.

10. A fault isolation processing control method for an integrated multifunctional hydraulic system according to any one of claims 1 to 7, characterized in that: The specific steps include: G100, the system monitors the system status in real time through sensors, and immediately enters the fault analysis phase when an abnormal signal is detected; G200 and intelligent control unit perform fault diagnosis to determine the fault type, location and severity; G300, the system determines the fault level based on the fault diagnosis results; G400, for level 3 and level 4 faults, the system immediately performs fault isolation operations; G500, the system performs fault adaptive adjustments to maximize system available functions while ensuring safety; G600 system issues fault warnings to operators, including fault type, location, severity, and handling suggestions. Warning methods include audible and visual alarms, instrument displays, and human-computer interface prompts to ensure that operators are aware of system status in a timely manner. G700, the system sends fault information to the management center or the manufacturer's technical support department to request remote diagnosis and technical support. Remote technicians can view system data, conduct in-depth diagnosis, and provide professional treatment suggestions; G800, after the fault is eliminated, the system performs recovery operations.

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