Hydraulic preheating system and engineering vehicle
By introducing an oil pump, temperature detection device, and controller into the hydraulic system of engineering vehicles, and utilizing a preheating system composed of a pressure-building valve and a preheating valve, the problem of difficult preheating of remote equipment in low-temperature environments was solved, achieving rapid and uniform preheating and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SANY AUTOMOBILE MFG CO LTD
- Filing Date
- 2026-03-30
- Publication Date
- 2026-06-26
AI Technical Summary
In existing technologies, the hydraulic system of engineering vehicles cannot effectively preheat remote equipment in low-temperature environments, resulting in sluggish operation of the actuators. Furthermore, the electro-proportional relief valve is costly and has inaccurate adjustment.
The hydraulic preheating system, consisting of an oil pump, temperature detection device, and controller, achieves uniform and rapid preheating of the oil supply circuit through the cooperation of a pressure building valve, a first preheating valve, and a second preheating valve. The hot oil is then directly flowed through the remote valve group, avoiding the use of expensive electro-proportional relief valves.
It enables rapid and uniform preheating of the hydraulic system of engineering vehicles, improves the response speed of actuators and the operating performance of equipment, and reduces costs.
Smart Images
Figure CN122280929A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of hydraulic system technology for engineering vehicles, and particularly to a hydraulic preheating system for engineering vehicles and the engineering vehicle itself. Background Technology
[0002] In the field of hydraulic systems for construction machinery such as fire trucks equipped with long boom valve assemblies and work platform valve assemblies, in order to ensure that the equipment can be quickly put into rescue operations in low-temperature environments, it is necessary to effectively preheat the hydraulic system to reduce the viscosity of the oil and ensure that each actuator is sensitive and responsive.
[0003] In existing technologies, hydraulic oil preheating is generally based on the principle of overflow heating. Specifically, a typical approach involves using a load-sensitive pump in conjunction with an electro-proportional relief valve to establish a low-pressure, high-flow-rate overflow condition in the control system. This causes the hydraulic oil to generate heat due to throttling as it flows through the pump and relief valve, thus raising the temperature of the oil in the tank. This method utilizes the hydraulic system's own energy to convert heat, avoiding the localized oil degradation problems that can occur with external heating. However, this approach has inherent limitations: firstly, it relies on precision proportional components such as electro-proportional relief valves, resulting in high costs and potential pressure regulation errors; secondly, the heat generated during preheating is mainly concentrated in the main oil circuit from the pump outlet to the relief valve, returning directly to the tank via overflow, making it difficult to effectively circulate the hot oil to the boom valve assembly and other end-point equipment located far from the tank. This causes the oil to stagnate in the low-temperature oil, resulting in a slow response during initial operation and affecting the operational performance and efficiency of the equipment in the early stages of operation. Summary of the Invention
[0004] The main objective of this invention is to propose a hydraulic preheating system and engineering vehicle for use in engineering vehicles, aiming to solve the technical problems of high cost of electro-proportional relief valves in the prior art and their inability to meet the preheating needs of remote end equipment.
[0005] To achieve the above objectives, the present invention proposes a hydraulic preheating system for engineering vehicles, the hydraulic preheating system comprising: An oil pump is provided, with its two ends connected to the oil inlet and outlet of the oil tank via pipelines to form an oil supply circuit. Along the oil flow direction, a pressure building valve, a first preheating valve, a boom valve group, a platform valve group, and a second preheating valve are connected in parallel in the oil supply circuit. A temperature detection element is installed on the oil supply circuit to detect the oil temperature in the oil supply circuit. The controller is configured to: Based on a first preset temperature, in response to the oil temperature being lower than the first preset temperature, the pressure building valve, the first preheating valve, and the second preheating valve are opened sequentially.
[0006] In one embodiment, the hydraulic preheating system further includes an action detection element that is signal-connected to the boom valve assembly, the action detection element being used to detect the current state of the boom valve assembly; The controller is also configured to: Based on a first preset temperature, in response to the oil temperature being lower than the first preset temperature, it is determined whether the current state is a retracted state; When the current state is the contracted state, the pressure building valve, the first preheating valve, and the second preheating valve are opened in sequence; If the current state is not in the retracted state, a manual preheating prompt message is sent to the operation terminal.
[0007] In one embodiment, after sequentially opening the pressure-building valve, the first preheating valve, and the second preheating valve, the controller is further configured to: In response to detecting that the current state is not in the retracted state, the second preheating valve is closed.
[0008] In one embodiment, the controller is further configured to: In response to the oil temperature being lower than the first preset temperature, the pressure building valve is opened, and after a first preset time, the first preheating valve and the second preheating valve are opened simultaneously.
[0009] In one embodiment, the controller is further configured to: Based on a second preset temperature, in response to the oil temperature being greater than or equal to the second preset temperature, the first preheating valve and the second preheating valve are closed, wherein the second preset temperature is greater than the first preset temperature.
[0010] In one embodiment, the hydraulic preheating system further includes: A pressure valve, wherein the pressure valve is connected in series with the first preheating valve; A constant pressure variable valve, one end of which is connected to the oil supply circuit and the other end of which is connected to the pressure building valve; The set pressure of the pressure valve is lower than the set pressure of the constant pressure variable valve, so that the oil pump outputs at maximum flow rate.
[0011] In one embodiment, the hydraulic preheating system further includes a safety valve connected in parallel to the oil supply circuit, and the connection point of the safety valve to the oil supply circuit is located between the connection point of the pressure valve to the oil supply circuit and the connection point of the boom valve assembly to the oil supply circuit.
[0012] In one embodiment, the hydraulic preheating system further includes a load sensing valve, one end of which is connected to the pressure building valve and the other end of which is connected to the oil supply circuit. The load sensing valve is connected in parallel with the constant pressure variable valve.
[0013] In one embodiment, the pressure-building valve is a two-position four-way directional valve.
[0014] In addition, to solve the above problems, the present invention also proposes an engineering vehicle that uses the hydraulic preheating system described above.
[0015] The hydraulic preheating system provided by this invention uses a first preheating valve to allow preheated oil to flow through the oil supply pipeline and replace the low-temperature oil in the boom valve group and platform valve group. This allows the hot oil, heated by overflow, to directly preheat the remote boom valve group. At the same time, a second preheating valve preheats the oil in the platform valve group, achieving uniform and rapid preheating of the entire oil supply circuit. This effectively improves preheating efficiency and solves the problem of slow initial actuator action caused by excessively low oil temperature in the valve group and pipeline. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the overall structure of the hydraulic preheating system of the present invention.
[0018] Figure 2 The diagram shown is a structural block diagram of an engineering vehicle provided in an embodiment of this application.
[0019] Attached icon number 10. Oil pump; 20. Temperature detection device; 31. First preheating valve; 32. Second preheating valve; 40. Pressure building valve; 51. Pressure valve; 52. Constant pressure variable valve; 60. Safety valve; 70. Load sensing valve; 80. Oil supply circuit; 100. Engineering vehicle; 101. Processor; 102. Memory; 103. Input device; 104. Output device; 200. Boom valve assembly; 300. Platform valve assembly.
[0020] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0022] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0023] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.
[0024] This invention proposes a hydraulic preheating system, typically used in special vehicles such as firefighting and rescue vehicles equipped with telescopic supports or platforms. Please refer to [link / reference]. Figure 1 The hydraulic preheating system includes an oil pump 10, a temperature detection element 20, and a controller. The two ends of the oil pump 10 are connected to the oil inlet and outlet of the oil tank via pipelines to form an oil supply circuit 80. Along the oil flow direction, a pressure-building valve 40, a first preheating valve 31, a boom valve assembly 200, a platform valve assembly 300, and a second preheating valve 32 are connected in parallel on the oil supply circuit 80. The temperature detection element 20 is installed on the oil supply circuit 80 to detect the oil temperature. The controller is configured to, based on a first preset temperature, sequentially open the pressure-building valve 40, the first preheating valve 31, and the second preheating valve 32 when the oil temperature is lower than the first preset temperature.
[0025] The inlet of oil pump 10 is connected to the outlet of the oil tank, and the outlet of oil pump 10 is connected to the inlet of the oil tank, forming an oil supply circuit 80. Multiple parallel nodes are connected in the pipeline, with a pressure-building valve 40, a first preheating valve 31, a boom valve assembly 200, a platform valve assembly 300, and a second preheating valve 32 connected in parallel along the oil flow direction. This ensures the supply of oil under the action of oil pump 10.
[0026] With the cooperation of multiple different valve assemblies, the fire truck boom and platform are driven to perform response actions. In addition, a temperature detection element 20 is installed in the oil supply circuit 80 to detect the oil temperature. The signal from the temperature detection element 20 is sent to the controller. In addition, the controller is also used to receive action request signals from the external operation panel, and thus outputs corresponding control signals according to the action request to drive each valve assembly and oil pump 10 to perform corresponding actions.
[0027] In this application, the term "valve assembly" refers to a collection of valves designed to achieve preheating path switching and pressure control functions. It can be an integrated valve or a series of independently connected valves. Examples include, but are not limited to, directional valves, relief valves, pressure reducing valves, check valves, and combinations thereof. The boom valve assembly 200 can include, but is not limited to, fire truck boom valve assembly 200, concrete pump truck boom valve assembly 200, etc.
[0028] Specifically, the controller's control process includes the following steps: Step S10: Based on the first preset temperature, in response to the oil temperature being lower than the first preset temperature, the pressure building valve 40, the first preheating valve 31, and the second preheating valve 32 are opened sequentially.
[0029] The term "preset temperature" refers to a temperature reference value used to trigger or stop the preheating process. It can be a single temperature point or a temperature range. In some specific scenarios, the preset temperature can be set or adaptively adjusted according to the type of oil, ambient temperature, or equipment operating conditions.
[0030] The first preset temperature can be set to a specific temperature value T1, such as 0℃, 5℃, or 10℃, based on the fact that the viscosity of the oil increases significantly at this temperature, affecting the normal response of the system. The temperature detection element 20 can be set at any location that can reflect the oil temperature of the system's oil supply circuit 80, such as the outlet of the oil pump 10, the inlet of the oil tank, or the boom valve assembly 200, etc. This embodiment does not impose any specific limitations.
[0031] When the oil temperature T is detected to be lower than T1, the preheating start condition is deemed met. More generally, the value of the first preset temperature can be set in various ways. For example, it can include, but is not limited to: a fixed temperature value, a dynamic value obtained by looking up a table based on the ambient temperature, or a temperature range including an upper and lower limit. These solutions can all achieve the function of "determining whether the system is in a low-temperature state that requires preheating". Specific means to achieve the above detection function can include: at the hardware level, a Pt100 temperature sensor, thermocouple, or NTC thermistor can be used in conjunction with a signal circuit; at the software or logic level, the controller can read the voltage signal of the sensor through the ADC module, convert it into a temperature value through a calibration curve, and then compare it with the first preset temperature stored in the memory.
[0032] It should be noted that the phrase "detecting oil temperature below the first preset temperature" refers to any operation that can determine the current oil temperature and identify it as being below a certain set threshold. Specifically, it can refer to periodic sampling and comparison, or it can encompass receiving a low-temperature interrupt signal from a dedicated temperature module.
[0033] Upon detecting that the oil temperature T is lower than T1, the system can automatically activate the pressure-building valve 40, the first preheating valve 31, and the second preheating valve 32 to form a heating cycle when the low temperature is sensed. First, the controller sends a start or speed-up command to the motor or other drive mechanism of the oil pump 10, causing the oil pump 10 to operate. Simultaneously, the controller controls the opening of the pressure-building valve 40, the first preheating valve 31, and the second preheating valve 32, thereby establishing an overflow path. When the oil flows through the pressure-building valve 40, the first preheating valve 31, and the second preheating valve 32, throttling and overflow occur, converting hydraulic energy into heat energy. Using this method, the mechanical energy output by the pump can be efficiently converted into the internal energy of the oil without the system performing external work.
[0034] A telescopic boom pipeline is installed between the boom valve assembly 200 and the platform valve assembly 300. After flowing through the boom valve assembly 200, another portion of the oil flows through the telescopic boom pipeline through the platform valve assembly 300 and the second preheating valve 32, finally returning to the oil tank via the oil supply circuit 80. Thus, the low-temperature oil that originally remained in the long pipeline and the boom valve assembly 200 and platform valve assembly 300 is continuously replaced and heated by hot oil from the oil pump 10.
[0035] Furthermore, the hydraulic preheating system also includes an action detection device that is signal-connected to the boom valve assembly 200, the action detection device being used to detect the current state of the boom valve assembly 200.
[0036] Step S10 in this embodiment specifically includes: Step S11: Based on the first preset temperature, in response to the oil temperature being lower than the first preset temperature, determine whether the current state is a retracted state.
[0037] For equipment safety reasons, full preheating is not immediately initiated after the oil temperature is detected to be below the first preset temperature. In some typical application scenarios, the boom is in the retracted state, which is a common transportation and storage state for construction machinery, and preheating is safest in this state.
[0038] In this preferred embodiment, after detecting that the oil temperature is lower than a first preset temperature, it is determined whether the current state of the boom valve assembly 200 is in a retracted position. The boom valve assembly 200 being in a retracted state is considered a safe state. Specifically, a safe state refers to a state where the equipment is under no load or low load and structurally stable, such as when the boom of a fire truck or aerial work platform is fully retracted and in a driving position. This determination can be made using a motion detection device, specifically an angle sensor or position sensor installed at the boom joint to detect the boom angle. The boom angle is then compared to a preset safe angle range to determine whether the boom valve assembly 200 is in a retracted state.
[0039] Step S12: When the current state is the contracted state, the pressure building valve 40, the first preheating valve 31 and the second preheating valve 32 are opened in sequence.
[0040] In one scenario, if the boom valve assembly 200 is in the retracted state, the controller sequentially opens the pressure building valve 40, the first preheating valve 31, and the second preheating valve 32 to preheat the oil in the oil supply circuit 80.
[0041] Step S13: If the current state is not in the collapsed state, send a manual preheating prompt message to the operation terminal.
[0042] It is understandable that there is a certain safety hazard when the boom valve assembly 200 is extended. If the boom valve assembly 200 is not in the retracted state, the controller can pause automatic preheating and send a manual preheating prompt message to the display interface of the operating terminal to prompt an alarm or request manual confirmation, so as to prevent the accidental risks that may be caused by high-flow preheating when the boom is extended.
[0043] Furthermore, following step S12, the following steps are also included: Step S14: In response to detecting that the current state is not in the retracted state, the second preheating valve 32 is closed.
[0044] In another scenario, if preheating is in progress but an emergency occurs requiring the operator to immediately extend the boom, the boom valve assembly 200 may not be in the retracted state. In this case, if hydraulic fluid continues to flow through the second preheating valve 32, some flow will be lost through this branch, affecting the speed and power of the boom's movement. Therefore, the second preheating valve 32 must be immediately closed to cut off this branch, ensuring that all or most of the hydraulic fluid can be used to drive the boom's movement. Simultaneously, the first preheating valve 31 remains open, allowing the remaining hydraulic fluid to be converted into heat while the boom is being driven, achieving "preheating while operating," further reducing preheating waiting time.
[0045] As another implementation, to further improve control accuracy, if no action signal from the boom valve assembly 200 is received within a preset waiting time, the controller can sequentially open the pressure-building valve 40, the first preheating valve 31, and the second preheating valve 32 to enter the preheating stage. The preset waiting time can be set to 10 seconds; for example, after determining that the oil temperature is lower than a first preset temperature, wait 10 seconds before opening the pressure-building valve 40, the first preheating valve 31, and the second preheating valve 32. If an action signal from the boom is received during the waiting stage or subsequently, it indicates that the operator intends to perform emergency work. The system can maintain or switch to a compatible preheating mode, such as closing the second preheating valve 32, instead of immediately entering the full preheating stage, to ensure the safety of the entire preheating process.
[0046] Furthermore, the controller also includes the following steps during execution: Step S20: In response to the oil temperature being lower than the first preset temperature, the pressure building valve 40 is opened, and after a first preset time, the first preheating valve 31 and the second preheating valve 32 are opened simultaneously.
[0047] Based on the above safety assessment, the preheating process can be designed more precisely. In this embodiment, the oil pump 10 needs to be lubricated before the preheating stage to avoid the oil pump 10 operating at high pressure and high flow rate immediately without lubrication, which may exacerbate wear.
[0048] Specifically, when the oil temperature is detected to be lower than the first preset temperature, only the pressure-building valve 40 is opened, while the first preheating valve 31 and the second preheating valve 32 are kept closed, thus establishing a low-pressure, low-flow operating condition. After a first preset time, the first preheating valve 31 and the second preheating valve 32 are opened sequentially to establish a high-pressure, high-flow operating condition for preheating. For example, it is first run at a lower pressure (e.g., 2 MPa) and a lower flow rate for a period of time (e.g., 30 seconds) to ensure sufficient lubrication of the oil pump 10 and each valve assembly. Then, it switches to the preheating stage, opens the first preheating valve 31 to increase the pressure to a higher level, and opens the second preheating valve 32 for efficient and comprehensive preheating. This phased control takes into account both the lubrication protection of the cold engine and the need for rapid preheating. It avoids the wear risk caused by high-load operation of the cold engine and achieves a smooth transition.
[0049] To achieve high-pressure, low-flow operation at the beginning of preheating, as one embodiment, the hydraulic preheating system includes a load-sensing valve 70. One end of the load-sensing valve 70 is connected to the pressure-building valve 40, and the other end is connected to the oil supply circuit 80. The load-sensing valve 70 is connected in parallel with the constant-pressure variable valve 52.
[0050] During the lubrication phase, the system establishes a low-pressure, low-flow operating condition. The pressure in the oil supply circuit 80 is controlled through the cooperation of the load sensing valve 70 and the pressure-building valve 40. Specifically, the pressure-building valve 40 is first opened to generate a base pressure within the oil supply circuit 80 for oil circulation. Then, the load sensing valve 70 is opened, set to 2 MPa, allowing the system to circulate at low pressure with a small flow rate, focusing on lubricating the pump and the internal components of each valve assembly. After a first preset time, the system determines whether to enter the high-pressure, high-flow preheating phase. Its advantages include significantly reduced cold-start wear and extended service life of core hydraulic components.
[0051] The preheating phase occurs after the lubrication phase. Whether to enter the preheating phase can be determined based on the current state of the boom valve assembly 200, ensuring that preheating only occurs when the boom is actually in the retracted state. This saves energy and reduces no-load losses in the hydraulic system. Furthermore, this embodiment includes, but is not limited to, the above-mentioned solutions. It can also utilize a variable frequency motor to drive the pump at low speed, or control the oil pump 10 displacement to a smaller position. Specifically, the duration and low-pressure value of the lubrication phase can be calibrated and stored according to the ambient temperature and hydraulic oil type. For example, the lubrication time can be extended to 30 seconds at -30°C.
[0052] Furthermore, in order to generate sufficient heat during the preheating process, as a preferred embodiment, the hydraulic preheating system further includes a pressure valve 51 and a constant-pressure variable valve 52. The pressure valve 51 is connected in series with the first preheating valve 31. One end of the constant-pressure variable valve 52 is connected to the oil supply circuit 80, and the other end is connected to the pressure building valve 40. The set pressure of the pressure valve 51 is less than the set pressure of the constant-pressure variable valve 52, so that the oil pump 10 outputs at maximum flow rate.
[0053] By employing a high-flow-rate operating condition, the preheating power is increased, thus significantly improving the preheating rate. Therefore, by setting a pressure valve 51 connected in series with the first preheating valve 31, assuming the set pressure of pressure valve 51 is P1 and the set pressure of constant-pressure variable valve 52 is P2, adjusting P2 to be less than P1 ensures that the system never reaches the variable-rate operating condition, allowing oil pump 10 to output oil at maximum flow rate. Oil pump 10 can be a constant-pressure variable pump, characterized by automatically reducing its displacement to maintain constant pressure when the system pressure reaches its set variable pressure (or constant pressure point, cut-off pressure). Therefore, to maintain maximum displacement (i.e., maximum flow rate) during preheating, the opening pressure P2 of pressure valve 51 is set to be less than the pressure P1 of constant-pressure variable valve 52. In other words, during the preheating phase, the system pressure is limited to P2 by pressure valve 51. Since P2 does not reach the variable pressure P1 of oil pump 10, oil pump 10 will continue to operate at maximum displacement, outputting maximum flow, thus achieving efficient preheating under high-pressure, high-flow conditions. When the preheating phase ends and the system enters normal operation, pressure valve 51 is closed, and the system pressure is determined by the load or limited to P1 by constant-pressure variable valve 52. Oil pump 10 then enters normal constant-pressure variable regulation state. This design cleverly utilizes the characteristics of constant-pressure variable valve 52, achieving the pressure control required for high-pressure, high-flow preheating with a simple, reliable, and low-cost valve assembly, avoiding the use of expensive electro-proportional relief valves.
[0054] Furthermore, after preheating is complete, the preheating phase is terminated via the controller. Specifically, the controller also includes performing the following steps: Step S30: Based on the second preset temperature, in response to the oil temperature being greater than or equal to the second preset temperature, close the first preheating valve 31 and the second preheating valve 32.
[0055] Wherein, the second preset temperature is greater than the first preset temperature, the first preset temperature is denoted as T1, and the second preset temperature is denoted as T2.
[0056] T1 is the start temperature of the preheating stage; T2 is the stop temperature of the preheating stage. When the oil temperature rises from a low temperature to T2 after the preheating stage, the system is considered to have reached a suitable operating temperature, and the controller closes all preheating valves, allowing the system to fully transition to normal operating mode. In this embodiment, a dual-threshold control method using a first preheating temperature and a second preheating temperature avoids frequent starts and stops near the temperature critical point, making the control more stable.
[0057] Furthermore, the hydraulic preheating system also includes a safety valve 60, which is connected in parallel to the oil supply circuit 80, and the connection point of the safety valve 60 and the oil supply circuit 80 is located between the connection point of the pressure valve 51 in the oil supply circuit 80 and the connection point of the boom valve assembly 200 in the oil supply circuit 80.
[0058] Assuming the safety valve 60 is set to pressure P3, when pressure valve 51 is de-energized and pressure-building valve 40 is energized, the constant pressure variable valve 52 is set to pressure, which is also the system pressure. During normal system operation, the constant pressure variable valve 52 automatically adjusts the displacement of the variable pump. By setting the safety valve 60, the system pressure is ensured not to exceed the set pressure of the safety valve 60, thus maintaining the stability of system operation.
[0059] In addition, to solve the above problems, the present invention also proposes a computer-readable storage medium storing a hydraulic preheating program, wherein the hydraulic preheating control program, when executed by a processor, implements the execution steps of the controller as described above.
[0060] Computer-readable storage media may take the form of any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may, for example, include, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.
[0061] In addition to the methods and devices described above, embodiments of this application may also be computer program products, which include computer program information that, when run by a processor, causes the processor to perform steps in a hydraulic preheating system according to various embodiments of this application.
[0062] Computer program products can be written in any combination of one or more programming languages to perform the operations of the embodiments of this application. The programming languages include object-oriented programming languages such as Java and C++, as well as conventional procedural programming languages such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.
[0063] Furthermore, to address the aforementioned problems, this invention also proposes an engineering vehicle that utilizes the hydraulic preheating system described above. The engineering vehicle can be, for example, a fire truck, a rescue vehicle, or a ladder truck.
[0064] like Figure 2 As shown, the engineering vehicle 10 includes one or more processors 101 and memory 102.
[0065] The processor 101 may be a central processing unit (CPU) or other form of processing unit with data processing capabilities and / or instruction execution capabilities, and may control other components in the engineering vehicle 10 to perform desired functions.
[0066] The memory 102 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 101 may execute the program instructions to implement a vehicle weight estimation method and / or other desired functions according to the various embodiments of this application described above.
[0067] In one example, the engineering vehicle 10 may also include an input device 103 and an output device 104, which are interconnected via a bus system and / or other forms of connection mechanism (not shown).
[0068] When the engineering vehicle is a standalone device, the input device 103 can be a communication network connector for receiving the collected input signals from the first device and the second device.
[0069] In addition, the input device 103 may also include, for example, a keyboard, a mouse, etc.
[0070] The output device 104 can output various information to the outside, including determined distance information, direction information, etc. The output device 104 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.
[0071] Of course, for the sake of simplicity, Figure 2 Only some of the components of the engineering vehicle 10 relevant to this application are shown in this illustration; components such as buses, input / output interfaces, etc., are omitted. In addition, the engineering vehicle 10 may include any other suitable components depending on the specific application.
[0072] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.
Claims
1. A hydraulic preheating system for engineering vehicles, characterized in that, The hydraulic preheating system includes: An oil pump is provided, with its two ends connected to the oil inlet and outlet of the oil tank via pipelines to form an oil supply circuit. Along the oil flow direction, a pressure building valve, a first preheating valve, a boom valve group, a platform valve group, and a second preheating valve are connected in parallel in the oil supply circuit. A temperature detection element is installed on the oil supply circuit to detect the oil temperature in the oil supply circuit. The controller is configured to: Based on a first preset temperature, in response to the oil temperature being lower than the first preset temperature, the pressure building valve, the first preheating valve, and the second preheating valve are opened sequentially.
2. The hydraulic preheating system as described in claim 1, characterized in that, The hydraulic preheating system also includes an action detection device that is signal-connected to the boom valve group, the action detection device being used to detect the current state of the boom valve group; The controller is also configured to: Based on a first preset temperature, in response to the oil temperature being lower than the first preset temperature, it is determined whether the current state is a retracted state; When the current state is the contracted state, the pressure building valve, the first preheating valve, and the second preheating valve are opened in sequence; If the current state is not in the retracted state, a manual preheating prompt message is sent to the operation terminal.
3. The hydraulic preheating system as described in claim 2, characterized in that, After sequentially opening the pressure-building valve, the first preheating valve, and the second preheating valve, the controller is further configured to: In response to detecting that the current state is not in the retracted state, the second preheating valve is closed.
4. The hydraulic preheating system as described in claim 1, characterized in that, The controller is also configured to: In response to the oil temperature being lower than the first preset temperature, the pressure building valve is opened, and after a first preset time, the first preheating valve and the second preheating valve are opened simultaneously.
5. The hydraulic preheating system as described in claim 1, characterized in that, The controller is also configured to: Based on a second preset temperature, in response to the oil temperature being greater than or equal to the second preset temperature, the first preheating valve and the second preheating valve are closed, wherein the second preset temperature is greater than the first preset temperature.
6. The hydraulic preheating system as described in claim 1, characterized in that, The hydraulic preheating system also includes: A pressure valve, wherein the pressure valve is connected in series with the first preheating valve; A constant pressure variable valve, one end of which is connected to the oil supply circuit and the other end of which is connected to the pressure building valve; The set pressure of the pressure valve is lower than the set pressure of the constant pressure variable valve, so that the oil pump outputs at maximum flow rate.
7. The hydraulic preheating system as described in claim 6, characterized in that, The hydraulic preheating system also includes a safety valve, which is connected in parallel to the oil supply circuit. The connection point of the safety valve to the oil supply circuit is located between the connection point of the pressure valve to the oil supply circuit and the connection point of the boom valve assembly to the oil supply circuit.
8. The hydraulic preheating system as described in claim 6, characterized in that, The hydraulic preheating system also includes a load sensing valve, one end of which is connected to the pressure building valve and the other end of which is connected to the oil supply circuit. The load sensing valve is connected in parallel with the constant pressure variable valve.
9. The hydraulic preheating system as described in any one of claims 1 to 8, characterized in that, The pressure-building valve is a two-position four-way directional valve.
10. An engineering vehicle, characterized in that, The engineering vehicle is equipped with a hydraulic preheating system as described in any one of claims 1 to 9.