Power hoist control method and device for power hoist system of truck crane

Abstract

The present application relates to the technical field of truck crane, and provides a power lifting control method and device of a power lifting system of a truck crane. The power lifting system comprises: a power lifting valve having an air inlet and a first air outlet, the air inlet being communicated with a brake air reservoir of the truck crane, and the first air outlet being communicated with an engine air inlet pipe of the truck crane; and a first control valve element, a valve core of the first control valve element extending into a valve cavity of the power lifting valve, and the first control valve element being capable of conducting and cutting off a passage between the air inlet and the valve cavity. The present application adds the power lifting valve communicated with the brake air reservoir at the engine air inlet end, so that compressed air in the brake air reservoir can be used to provide a certain air flow for the engine when the engine instantaneous power is insufficient under the lifting condition, thereby preventing the engine from being out of operation and causing safety hazards. Moreover, the power lifting system has simple structure, small installation space requirement, low cost and good maintenance, and can greatly reduce the engine weight and save the vehicle energy consumption.

Description

Technical Field

[0001] This invention relates to the field of truck crane technology, and more specifically, to a power lifting system, power lifting control method, and device for truck cranes. Background Technology

[0002] Truck cranes typically operate in two modes: lifting and traveling. During lifting, operators often struggle to determine if the engine's instantaneous power is sufficient to handle the weight of the object, making it difficult to control the throttle opening. When the engine's instantaneous power is less than the power required by the object, the engine will stall. Engine stalling during lifting exposes the truck crane to abnormal dynamic load impacts, significantly affecting its structural stability and lifting safety, and potentially leading to serious accidents resulting in injury or death.

[0003] The current solution is to add a mechanical or electric supercharger between the turbocharger and the engine intake to increase the intake air volume, thereby increasing engine power and preventing stalling. However, mechanical / electric superchargers have a complex structure, require more installation space, are more expensive, are inconvenient to maintain, and increase engine weight, leading to increased vehicle fuel consumption.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a power lifting system, power lifting control method and device for a truck crane. A power lifting valve connected to the brake air reservoir is added to the engine intake end. When the engine power is momentarily insufficient during lifting operations, the compressed air in the brake air reservoir can provide a certain air flow to the engine, thereby mitigating turbocharger delay and preventing the engine from stalling when a large load is suddenly added, which would affect the safety of the lifting operation. Moreover, the power lifting system has a simple structure, does not require additional complex systems, requires little installation space, has low cost, greatly reduces the number of parts, has high robustness, is easy to maintain, can be adapted to different engine models, and can greatly reduce engine weight and save vehicle energy consumption.

[0006] According to one aspect of the present invention, a power lifting system for a truck crane is provided, comprising: a power lifting valve having an air inlet and a first air outlet, the air inlet being connected to a brake air reservoir of the truck crane, and the first air outlet being connected to an engine air intake pipe of the truck crane; and a first control valve having a valve core extending into a valve chamber of the power lifting valve, the first control valve being capable of opening and closing the passage between the air inlet and the valve chamber.

[0007] In some embodiments, the power booster valve further has a second air outlet, and the power booster system further includes: a second control valve connected to the second air outlet, the second control valve being capable of opening and closing the second air outlet.

[0008] In some embodiments, the power lifting system further includes: a connected compressed air intake pipe and a connector, the connector being connected to the air inlet, and the compressed air intake pipe being connected to the brake air reservoir via an air treatment unit; wherein the air treatment unit is also connected to the air compressor of the truck crane, and an electrically controlled relay valve is also provided in the pipeline of the compressed air intake pipe.

[0009] In some embodiments, the power boosting system further includes: a seal disposed between the power boosting valve and a component connected to the power boosting valve; and a fastener detachably connected between the power boosting valve and the engine intake manifold, and between the first control valve and the power boosting valve.

[0010] According to another aspect of the present invention, a power lifting control method for a truck crane is provided for controlling a power lifting system as described in any of the above embodiments, comprising: responding to a first operating condition signal, controlling a first control valve to open a passage between the air intake and the valve chamber; wherein the first operating condition signal indicates that the truck crane is in a lifting condition and the instantaneous power of the truck crane's engine is less than the lifting load; responding to a second operating condition signal, controlling the first control valve to cut off the passage between the air intake and the valve chamber; wherein the second operating condition signal indicates that the engine speed and turbocharger speed of the truck crane have reached stable values.

[0011] In some embodiments, before responding to the first operating condition signal, the method further includes: in response to a hoisting request signal, detecting whether the pressure of the brake air reservoir has reached the system pressure; if so, activating the hoisting condition; otherwise, controlling the air compressor of the truck crane to pump air into the brake air reservoir until the pressure of the brake air reservoir reaches the system pressure; during the continuation of the first operating condition signal, the method further includes: in response to a signal indicating insufficient pressure in the brake air reservoir, controlling the air compressor of the truck crane to pump air into the brake air reservoir until the pressure of the brake air reservoir reaches the system pressure.

[0012] In some embodiments, during the duration of the first operating condition signal, the method further includes: in response to a signal indicating that the engine intake manifold pressure has exceeded the limit, controlling the first control valve to cut off the passage between the intake port and the valve chamber until the pressure of the engine intake manifold is lower than a pressure threshold; and / or, in response to a signal indicating that the engine intake manifold pressure has exceeded the limit, controlling the second control valve to open the second outlet until the pressure of the engine intake manifold is lower than the pressure threshold; wherein the power booster valve has the second outlet, the second control valve is connected to the second outlet, and the second control valve is capable of opening and closing the second outlet.

[0013] In some embodiments, during the duration of the first operating condition signal, the method further includes: in response to a signal indicating that the second control valve has failed and the engine intake manifold pressure exceeds the limit, controlling the first control valve to cut off the passage between the intake port and the valve chamber until the pressure of the engine intake manifold is lower than a pressure threshold; wherein the power booster valve further has a second outlet, the second control valve is connected to the second outlet, and the second control valve is capable of opening and closing the second outlet.

[0014] In some embodiments, the response to the first operating condition signal further includes: controlling the opening of an electrically controlled relay valve connected between the brake air reservoir and the air inlet to open the passage from the brake air reservoir to the air inlet; the response to the second operating condition signal further includes: controlling the electrically controlled relay valve to close, so that compressed air at the air inlet is discharged through the exhaust valve in the electrically controlled relay valve.

[0015] According to another aspect of the present invention, a power lifting control device for a truck crane is provided for implementing the power lifting control method as described in any of the above embodiments.

[0016] The beneficial effects of this invention compared to the prior art include at least the following:

[0017] The power lifting system of the present invention, through a power lifting valve connecting the brake air reservoir of the truck crane and the engine intake pipe, and a first control valve that can open and close the power lifting valve, can provide a certain air flow to the engine by utilizing the compressed air in the idle brake air reservoir when the engine power is insufficient during the lifting operation. This achieves engine auxiliary air intake and increases the engine instantaneous power, thereby alleviating the turbocharger delay problem and preventing the engine from stalling when a large load is suddenly added, which would affect the safety of the lifting operation.

[0018] The power boosting system of the present invention has a simple structure, does not require additional complex systems, requires little installation space, has low cost, and greatly reduces the number of parts, has high robustness, and is easy to maintain. By selecting different models of power boosting valves / first control valves, it can be adapted to different models of engines and can greatly reduce engine weight and save vehicle energy consumption.

[0019] The power boosting control method of the present invention activates the power boosting system when the truck crane is in lifting operation and the engine momentarily lacks power. This system instantly injects compressed air from the brake air reservoir into the engine intake manifold, promptly replenishing fresh air to the engine combustion chamber and preventing engine stalling that could pose a safety hazard. Once the turbocharger has stably output the required compressed air and the engine speed has stabilized, the power boosting valve is closed. In this way, the turbocharger delay can be mitigated through simple control logic, preventing the engine from stalling when a large load is suddenly added, which could affect the safety of the lifting operation.

[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0022] Figure 1 This diagram illustrates the assembly structure of the power booster system and the engine intake pipe in an embodiment of the present invention.

[0023] Figure 2 This diagram shows an exploded view of the power booster system and the engine intake pipe in an embodiment of the present invention.

[0024] Figure 3 This diagram illustrates the layout principle of the power boosting system in the vehicle architecture according to an embodiment of the present invention.

[0025] Figure 4 This diagram illustrates the main steps of the power lifting control method in an embodiment of the present invention.

[0026] Figure 5 The diagram illustrates the implementation process of the power boost control method in an embodiment of the present invention. Detailed Implementation

[0027] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to fully and completely convey the concept of the exemplary embodiments to those skilled in the art.

[0028] The accompanying drawings are merely illustrative of the invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0029] Furthermore, the process illustrated in the accompanying drawings is merely illustrative and does not necessarily include all steps. For example, some steps may be broken down, some steps may be combined or partially combined, and the actual order of execution may change depending on the actual situation. The use of terms such as "first," "second," and similar terms in the specific description does not indicate any order, quantity, or importance, but is merely used to distinguish different components.

[0030] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features in different embodiments can be combined with each other.

[0031] During lifting operations, the brake air reservoir of a truck crane is idle. This invention adds a power boost valve connected to the brake air reservoir at the engine intake end, which is controlled by the truck crane's ECU (Electronic Control Unit) and other control devices. During lifting operations, when the engine's power is momentarily insufficient, the compressed air from the brake air reservoir can provide a certain airflow to the engine, mitigating turbocharger delay and preventing engine stalling under sudden heavy loads, thus ensuring lifting operation safety.

[0032] Figure 1 This shows the assembly structure of the power booster system and the engine intake manifold. Figure 2 The disassembled structure of the power boost system and the engine intake manifold is shown. Figure 3This illustrates the layout principle of the power boost system within the vehicle architecture; combined with Figures 1 to 3 As shown, the power lifting system provided in this embodiment of the invention includes:

[0033] The power booster valve 10 has an air inlet 11 and a first air outlet 12. The air inlet 11 is connected to the brake air reservoir 50 of the truck crane, and the first air outlet 12 is connected to the engine air intake pipe 66 of the truck crane.

[0034] The first control valve 20 has a valve core 22 that extends into the valve chamber of the power booster valve 10. The first control valve 20 can open and close the passage between the air inlet 11 and the valve chamber.

[0035] The first control valve 20 can be a solenoid valve or other valve capable of performing the same function. The first control valve 20 can be opened and closed under the control of a control device such as an ECU to conduct and cut off the power booster valve 10. When the passage between the air inlet 11 and the valve chamber of the power booster valve 10 is open, compressed air from the brake reservoir 50, such as… Figure 1 The compressed air enters the engine intake pipe 66 as indicated by the middle arrow R; when the passage between the intake port 11 of the power boost valve 10 and the valve chamber is cut off, the compressed air stops entering the engine intake pipe 66.

[0036] Thus, if a sudden increase in load during lifting operations causes a momentary power shortage, potentially leading to engine 60 stalling, the ECU can activate the power boost system to instantly inject compressed air from the brake air reservoir 50 into the engine intake manifold 66, promptly replenishing fresh air to the combustion chamber of engine 60 and preventing engine stalling and potential safety hazards. Once the turbocharger 68 has stably supplied the required compressed air and the engine 60 speed has stabilized, the power boost valve 10 can be closed.

[0037] Therefore, the power boosting system of the present invention, through two basic valves—the power boosting valve 10 connecting the brake air reservoir 50 and the engine intake pipe 66, and the first control valve 20 capable of opening and closing the power boosting valve 10—can provide a certain airflow to the engine 60 using compressed air from the idle brake air reservoir 50 when the engine 60 momentarily lacks power during lifting operations. This achieves auxiliary air intake for the engine 60, increases the engine 60's power, alleviates the turbocharger 68 delay problem, and prevents the engine 60 from stalling under sudden heavy loads, thus affecting the safety of lifting operations. The power boosting system of the present invention has a simple overall structure, does not require additional complex systems, requires little installation space, has low cost, and significantly reduces the number of parts, making it highly robust and easy to maintain. By selecting different models of the power boosting valve 10 / first control valve 20, it can be adapted to different models of the engine 60, and can greatly reduce the weight of the engine 60, saving overall vehicle energy consumption.

[0038] In some embodiments, the power booster valve 10 further has a second air outlet 13, and the power booster system further includes a second control valve 30 connected to the second air outlet 13, the second control valve 30 being able to open and close the second air outlet 13.

[0039] The second control valve 30 can be a pressure relief valve, a safety valve, or other valves that can perform the same function. The second control valve 30 can be opened and closed under the control of the ECU or other control devices to open and close the second air outlet 13. When the pressure in the engine intake manifold 66 exceeds a set pressure threshold, the second control valve 30 can be opened to open the second air outlet 13, reducing the pressure in the engine intake manifold 66 and preventing damage to the engine 60 due to excessive pressure in the engine intake manifold 66.

[0040] Meanwhile, in terms of controlling the pressure of the engine intake manifold 66, the first control valve 20 and the second control valve 30 can be set to be redundant. When the ECU detects an abnormal pressure in the engine intake manifold 66, it will send an abnormal alarm signal to the truck crane and control the first control valve 20 to close, so as to prevent the engine 60 from being damaged due to excessive pressure in the engine intake manifold 66.

[0041] Furthermore, when the second control valve 30 fails, the ECU can send an abnormal alarm signal to the truck crane based on the detected abnormal pressure signal of the engine intake manifold 66, and at the same time control the first control valve 20 to close, so as to protect the engine 60.

[0042] In some embodiments, the power lifting system further includes: a connected compressed air intake pipe 42 and a connector 44, the connector 44 being connected to the air inlet 11, and the compressed air intake pipe 42 being connected to the brake air reservoir 50 via an air treatment unit 55; wherein, the air treatment unit 55 is also connected to the air compressor 58 of the truck crane, and an electrically controlled relay valve 70 is also provided in the pipeline of the compressed air intake pipe 42.

[0043] The brake air reservoir 50 is effectively connected to the air inlet 11 of the power boost valve 10 via the compressed air inlet pipe 42 and connector 44. The air handling unit 55 filters and processes the compressed air output from the brake air reservoir 50 to ensure the availability of air supplied to the engine intake pipe 66. When the pressure in the brake air reservoir 50 is insufficient, the air compressor 58 pumps air into the brake air reservoir 50 via the air handling unit 55, based on control signals from the ECU and other control devices. The electronically controlled relay valve 70 can either open the compressed air inlet pipe 42 or discharge compressed air from the air inlet 11 of the power boost valve 10, which will be explained in detail below in conjunction with the power boost control method.

[0044] In some embodiments, the power boosting system further includes: a seal disposed between the power boosting valve 10 and a component connected to the power boosting valve 10; and a fastener 80 detachably connected between the power boosting valve 10 and the engine intake pipe 66, and between the first control valve 20 and the power boosting valve 10.

[0045] Specifically, the connector 44 and the air inlet 11 of the power booster valve 10 can be sealed together by a first sealing ring 110. The first air outlet 12 of the power booster valve 10 and the engine intake pipe 66 can be sealed together by a first sealing gasket 120. The first control valve 20 and the power booster valve 10 can be sealed together by a second sealing ring 200. The second control valve 30 and the second air outlet 13 of the power booster valve 10 can be sealed together by a second sealing gasket 130. In this way, a sealed connection is achieved between the power booster valve 10 and each connected component, preventing air leakage.

[0046] Furthermore, the power booster valve 10 and the engine intake pipe 66, as well as the first control valve 20 and the power booster valve 10, are detachably connected by fasteners such as bolts 80, so that different models of power booster valve 10 / first control valve 20 / second control valve 30 can be configured according to different models of engine 60, thus achieving universality.

[0047] This invention also provides a power lifting control method for a truck crane, used to control the power lifting system described in any of the above embodiments. The features and principles of the power lifting system described in any of the above embodiments can be applied to the following power lifting control method embodiments. In the following power lifting control method embodiments, the features and principles of the power lifting system already explained will not be repeated.

[0048] The power lifting control method can be executed by the ECU and / or other control devices of the truck crane. In this specification, the ECU is primarily described as the control entity, but the invention is not limited thereto. The ECU and other control devices can control related components to perform corresponding actions by issuing corresponding control electrical signals.

[0049] Figure 4 This illustrates the main steps of the power lift control method; combined with Figures 1 to 4 As shown, the power boosting control method provided in this embodiment of the invention includes:

[0050] S420, in response to the first operating condition signal, controls the first control valve 20 to open the passage between the air intake port 11 and the valve chamber; wherein, the first operating condition signal indicates that the truck crane is in the lifting condition and the instantaneous power of the truck crane's engine is less than the lifting load.

[0051] When the truck crane is in lifting operation and the engine 60 momentarily lacks power, the power boost valve 10 is activated by the ECU and other control devices to instantly inject compressed air from the brake air reservoir 50 into the engine intake manifold 66, replenishing fresh air to the combustion chamber of the engine 60DE in a timely manner, so that the engine's instantaneous power can be quickly increased to be able to bear the lifting load, thus preventing the engine 60 from stalling and causing safety hazards.

[0052] S440, in response to the second operating condition signal, controls the first control valve 20 to cut off the passage between the air intake port 11 and the valve chamber; wherein, the second operating condition signal indicates that the engine speed and turbocharger speed of the truck crane have reached a stable value.

[0053] When the turbocharger 68 stably outputs the required compressed air and the engine 60 runs stably, the power boost valve 10 is closed, completing the engine power boost function of the power boost system.

[0054] Thus, through simple control logic, turbocharger delay can be mitigated, preventing engine 60 from stalling when suddenly subjected to heavy loads, which would affect the safety of hoisting operations.

[0055] In some embodiments, before responding to the first operating condition signal, the method further includes: in response to the hoisting request signal, detecting whether the pressure of the brake air reservoir 50 has reached the system pressure; if so, activating the hoisting condition; otherwise, controlling the air compressor 58 of the truck crane to pump air into the brake air reservoir 50 until the pressure of the brake air reservoir 50 reaches the system pressure.

[0056] The lifting request signal is generated based on the operation. For example, when the lifting button 90 of the truck crane is triggered, a lifting request signal is issued. In response to the lifting request signal, the ECU checks whether the pressure of the brake air reservoir 50 has reached the set system pressure. If so, the lifting mode is activated, at which time the outriggers 92 of the truck crane can extend, allowing the truck crane to enter the lifting mode; otherwise, the outriggers 92 cannot extend, and the ECU issues a pressure alarm signal, which can be transmitted to the air compressor 58 of the truck crane, causing the air compressor 58 to pump air into the brake air reservoir 50.

[0057] When the truck crane enters the lifting operation mode, the ECU monitors the engine power in real time to ensure sufficient power, so as to detect the first working condition signal in time and control the power lifting system to increase the engine power.

[0058] Furthermore, during the duration of the first operating condition signal, the method also includes: in response to a signal indicating insufficient pressure in the brake air reservoir 50, controlling the air compressor 58 to pump air into the brake air reservoir 50 until the pressure in the brake air reservoir 50 reaches the system pressure.

[0059] During the process of boosting engine power through the power boosting system, as the compression pressure in the brake air reservoir 50 is used, when the ECU detects that the pressure in the brake air reservoir 50 is insufficient, it controls the air compressor 58 to pump air into the brake air reservoir 50 to ensure that the air pressure delivered to the engine intake manifold 66 is appropriate.

[0060] In some embodiments, during the duration of the first operating condition signal, the method further includes: in response to a signal indicating that the pressure of the engine intake manifold 66 has exceeded the limit, controlling the first control valve 20 to cut off the passage between the intake port 11 and the valve chamber until the pressure of the engine intake manifold 66 is lower than the pressure threshold; and / or, in response to a signal indicating that the pressure of the engine intake manifold 66 has exceeded the limit, controlling the second control valve 30 to open the second outlet 13 until the pressure of the engine intake manifold 66 is lower than the pressure threshold.

[0061] Excessive pressure in the engine intake manifold 66 means that the pressure in the engine intake manifold 66 exceeds the pressure threshold, posing a risk of damage to the engine 60. In this case, the gas pressure output from the first outlet 12 of the power booster valve 10 can be reduced by the first control valve 20 and / or the second control valve 30, thereby reducing the pressure in the engine intake manifold 66.

[0062] In some embodiments, during the continuation of the first operating condition signal, the method further includes: in response to a signal indicating that the second control valve 30 has failed and the pressure of the engine intake manifold 66 has exceeded the limit, controlling the first control valve 20 to cut off the passage between the intake port 11 and the valve chamber until the pressure of the engine intake manifold 66 is lower than the pressure threshold.

[0063] In this way, it is ensured that even if the second control valve 30 fails, the pressure in the engine intake manifold 66 can be maintained normally through the first control valve 20, thus avoiding damage to the engine 60.

[0064] In some embodiments, in response to a first operating condition signal, the method further includes: controlling the opening of an electrically controlled relay valve 70 connected between the brake air reservoir 50 and the air inlet 11 to open the passage from the brake air reservoir 50 to the air inlet 11; and in response to a second operating condition signal, the method further includes: controlling the electrically controlled relay valve 70 to close, so that compressed air at the air inlet 11 is discharged through the exhaust valve in the electrically controlled relay valve 70.

[0065] The electronically controlled relay valve 70 is installed in the braking system. When the electronically controlled relay valve 70 is open, the compressed air in the brake air reservoir 50 can pass to the power lift valve 10. When the electronically controlled relay valve 70 is closed, the compressed air at the air inlet 11 of the power lift valve 10 will be discharged to the atmosphere through the exhaust valve in the electronically controlled relay valve 70 to prevent air from accumulating in the power lift valve 10 and affecting its function and reliability.

[0066] The following is combined with Figure 3 and Figure 5 Taking the ECU as the control unit, the first control valve 20 as a solenoid valve, and the second control valve as a safety valve as an example, this paper illustrates the implementation process of the power boost control method in a specific scenario. Figure 3 In the diagram, the bold solid line represents the airflow duct, and the dashed line represents the control signal.

[0067] S510, the ECU detected that the hoisting button 90 was triggered.

[0068] S520, the ECU determines whether the pressure of the brake air reservoir 50 has reached the system pressure. If so, it continues the subsequent process; otherwise, it controls the air compressor 58 to pump air into the brake air reservoir 50.

[0069] S530, outriggers 92 open, hoisting mode activated.

[0070] S540, the ECU controls the electronically controlled relay valve 70 to open, allowing compressed air in the brake air reservoir 50 to be delivered to the air inlet of the power booster valve 10 through the air handling unit 55.

[0071] During hoisting operations, the ECU monitors the engine's instantaneous power and hoisting load changes in real time. S550 determines whether the engine's instantaneous power is less than the hoisting load. If so, the subsequent process continues; otherwise, the solenoid valve of the power booster valve 10 does not operate.

[0072] S560, the ECU controls the solenoid valve of the power boost valve 10 to open, allowing compressed air to be supplied to the cylinder of the engine 60 to supplement the air required for combustion and prevent the engine 60 from stalling.

[0073] S570, the ECU checks whether the engine 60 and turbocharger 68 are stable. If not, it continues to control the solenoid valve to open; if so, it continues the subsequent process.

[0074] S580, the ECU controls the solenoid valve of the power boost valve 10 to close, thereby completing the engine power boost function.

[0075] During the above implementation process, as the compressed air in the brake air reservoir 50 is consumed, when the pressure of the brake air reservoir 50 drops to a certain value, the air compressor 58 can be controlled to work by sending an air pressure signal 300 to the air compressor 58 to pump air into the brake air reservoir 50 until the system pressure is reached.

[0076] After the engine power boost is completed, the electronically controlled relay valve 70 closes, and the compressed air at the intake of the power boost valve 10 will be discharged to the atmosphere through the exhaust valve in the electronically controlled relay valve 70 to prevent air from accumulating in the power boost valve 10 and affecting its function and reliability.

[0077] In addition, the power booster valve 10 is also equipped with a safety valve. When the pressure in the engine intake manifold 66 exceeds the pressure threshold set by the engine 60, the safety valve opens to reduce the pressure in the engine intake manifold 66 and prevent damage to the engine 60. When the pressure in the engine intake manifold 66 falls below the set pressure threshold, the safety valve closes again. Simultaneously, the ECU detects abnormal pressure in the engine intake manifold 66, issues an abnormality alarm signal, and controls the solenoid valve to close, preventing excessive intake manifold pressure from damaging the engine 60. Furthermore, if the safety valve fails, the ECU will also issue an abnormality alarm signal based on the detected abnormal pressure signal in the engine intake manifold 66, and simultaneously control the solenoid valve to close, preventing excessive intake manifold pressure from damaging the engine 60.

[0078] This invention also provides a power lifting control device for a truck crane, which can be used to implement the power lifting control method described in any of the above embodiments. When the truck crane is in the lifting condition and the engine is momentarily under power shortage, it can use the compressed air in the brake air reservoir to provide a certain air flow to the engine, thereby mitigating the turbocharger delay and preventing the engine from stalling when a large load is suddenly added, which would affect the safety of the lifting operation.

[0079] The power lifting control device can be configured independently in the truck crane, such as as the truck crane's ECU. Alternatively, the power lifting control device can be integrated into the truck crane's control components, such as the ECU. The power lifting control device can take several forms, including the following.

[0080] It can be represented in the form of a functional (program) module architecture, and may include modules that implement each step of the above-mentioned power boosting control method, such as modules for implementing step S420 and modules for implementing step S440.

[0081] In the form of a general-purpose computing device, it may include a processing unit and a storage unit. The storage unit stores executable instructions. When the executable instructions are executed by the processing unit, the power boosting control method described in any of the above embodiments is implemented.

[0082] The storage unit may include programs / utilities with one or more program modules, including but not limited to: an operating system, one or more application programs, other program modules, and program data. The general-purpose computing device also includes a bus connecting the processing unit and the storage unit, as well as other platform components. This bus may include a storage unit bus, a peripheral bus, a graphics acceleration port, a processing unit bus, and other local area buses. The general-purpose computing device can also communicate with one or more external devices, other computing devices in the vehicle, networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks such as the Internet).

[0083] It is represented in the form of a storage medium, in which a program is stored, which, when executed, implements the power boosting control method described in any of the above embodiments.

[0084] The storage medium can be any tangible medium that contains or stores a program, specifically any combination of one or more readable media, which can be a readable signal medium or a readable storage medium. The program can be used or combined with an instruction execution system, apparatus, or device. The program 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. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device, for example, via the Internet using an Internet service provider.

[0085] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A power hoist control method of a power hoist system of a truck crane, characterized by, The power hoisting system comprises: a power hoisting valve having an air inlet and a first air outlet, the air inlet being communicated with a brake reservoir of the truck crane, and the first air outlet being communicated with an engine air inlet pipe of the truck crane; and a first control valve element, a valve core of the first control valve element extending into a valve cavity of the power hoisting valve, and the first control valve element being capable of conducting and cutting off a passage between the air inlet and the valve cavity. The power hoisting control method comprises: in response to a first working condition signal, controlling the first control valve element to conduct the passage between the air inlet and the valve cavity; wherein the first working condition signal represents that the truck crane is in a hoisting working condition and instantaneous power of the engine of the truck crane is less than hoisting load; in response to a second working condition signal, controlling the first control valve element to cut off the passage between the air inlet and the valve cavity; wherein the second working condition signal represents that engine speed and turbocharger speed of the truck crane reach stable values; in a process in which the first working condition signal lasts, further comprising: in response to a signal representing that a second control valve element fails and pressure of the engine air inlet pipe exceeds a limit, controlling the first control valve element to cut off the passage between the air inlet and the valve cavity until the pressure of the engine air inlet pipe is lower than a pressure threshold; wherein the power hoisting valve further has a second air outlet, the second control valve element is connected to the second air outlet, and the second control valve element is capable of conducting and cutting off the second air outlet.

2. The power hoist control method of claim 1, wherein, The power hoisting valve further has a second air outlet, and the power hoisting system further comprises: a second control valve element connected to the second air outlet, the second control valve element being capable of conducting and cutting off the second air outlet.

3. The power hoist control method of claim 1, wherein, The power hoisting system further comprises: a compressed air inlet pipe and a joint connected in sequence, the joint being connected to the air inlet, and the compressed air inlet pipe being connected to the brake reservoir through an air treatment unit; wherein the air treatment unit is further connected to an air compressor of the truck crane, and an electrically-controlled relay valve is further arranged in a pipeline of the compressed air inlet pipe.

4. The power hoist control method of any one of claims 1-3, wherein, The power hoisting system further comprises: a sealing element arranged between the power hoisting valve and components connected to the power hoisting valve; a fastener, the power hoisting valve and the engine air inlet pipe being detachably connected through the fastener, and the first control valve element and the power hoisting valve being detachably connected through the fastener.

5. The power hoist control method of claim 1, wherein, Before the response to the first working condition signal, the method further comprises: in response to a hoisting request signal, detecting whether pressure of the brake reservoir reaches a system pressure, activating the hoisting working condition if yes, and controlling the air compressor of the truck crane to charge the brake reservoir until the pressure of the brake reservoir reaches the system pressure if no; in a process in which the first working condition signal lasts, the method further comprises: in response to a signal representing that the brake reservoir is insufficient in pressure, controlling the air compressor to charge the brake reservoir until the pressure of the brake reservoir reaches the system pressure.

6. The power hoist control method of claim 1, wherein, in a process in which the first working condition signal lasts, the method further comprises: in response to a signal indicative of the engine intake pipe pressure exceeding a threshold, controlling the first control valve to block the passage between the intake port and the valve chamber until the pressure in the engine intake pipe is below the threshold; and / or in response to a signal indicative of the engine intake pipe pressure exceeding a threshold, controlling the second control valve to open the second exhaust port until the pressure in the engine intake pipe is below the threshold; wherein the power boost valve has the second exhaust port, the second control valve is connected to the second exhaust port, and the second control valve is capable of opening and blocking the second exhaust port.

7. The power lift control method of claim 1, wherein, The response to the first operating condition signal further comprises: controlling an electrically controlled relay valve connected between the brake reservoir and the intake port to open to allow passage of compressed air from the brake reservoir to the intake port; The response to the second operating condition signal further comprises: controlling the electrically controlled relay valve to close to allow compressed air at the intake port to be vented through a vent valve in the electrically controlled relay valve.

8. A power hoist control device for a mobile crane, characterized by A power boost control method as claimed in any one of claims 1 to 7.

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