Compressor, control method and working machine

Abstract

The present disclosure relates to a compressor, a control method and a construction machine. The compressor comprises a cylinder assembly and a piston assembly. The cylinder assembly comprises a first port group and a second port group arranged on a cylinder block. The piston assembly comprises a first piston and a second piston which are separable. The first port group is closer to a top dead center of the piston assembly than the second port group. In a first mode, the second port group is closed, the first piston and the second piston are combined, and the compressor sucks and discharges through the first port group. In a second mode, the second port group is open, the first piston and the second piston are separated, the second piston is fixed relative to the cylinder block, the second piston isolates the first port group from the second port group, and the compressor sucks and discharges through the second port group. The compressor can compress refrigerant to supply air to an air conditioning system or compress air to supply air to a brake system. When a compressor of the brake system fails, the compressor can switch to the second mode, thereby improving the safety of the brake system.

Description

Technical Field

[0001] This application relates to the field of engineering machinery technology, and in particular to a compressor, a control method, and engineering machinery. Background Technology

[0002] Existing crane chassis are typically equipped with two independent air compressors, one for air conditioning and the other for supplying air to the braking system.

[0003] This approach has certain limitations. When the compressor of the braking system fails, there is a lack of backup air supply, which affects driving safety. If a backup compressor is set up for the braking system, it will lead to an increase in the number of parts, increase the overall vehicle cost, and be detrimental to the chassis layout. Summary of the Invention

[0004] This application provides a compressor, a control method, and engineering machinery to improve safety.

[0005] The first aspect of this application provides a compressor, comprising: A cylinder assembly includes a cylinder body and a first port group and a second port group disposed on the cylinder body. The first port group is used to draw in a first gas and discharge the first gas to an air conditioning system, and the second port group is used to draw in a second gas and discharge the second gas to a braking system. A piston assembly is movably disposed within the cavity of a cylinder to compress gas. The piston assembly includes a first piston and a second piston, which are separable. A first port group and a second port group are spaced apart in the direction of movement of the piston assembly, with the first port group being closer to the top dead center of the piston assembly than the second port group. The compressor has a first mode and a second mode. In the first mode, the second port group is closed, the first piston and the second piston are engaged, and the compressor draws in and exhausts air through the first port group. In the second mode, the second port group is open, the first piston and the second piston are separated, and the second piston is fixed relative to the cylinder. The position of the second piston relative to the cylinder is configured such that the first port group and the second port group are located on both sides of the second piston in the direction of piston assembly movement, and the second piston isolates the inner cavity where the first port group is located from the inner cavity where the second port group is located. The compressor draws in and exhausts air through the second port group.

[0006] In some embodiments, a partition is further included, which is telescopically disposed in the shell wall of the cylinder body. In a first mode, the partition is retracted into the shell wall, and in a second mode, the partition extends out of the inner cavity relative to the shell wall to engage with the second piston to limit the second piston.

[0007] In some embodiments, in the second mode, the partition is engaged with the end face of the second piston facing the first piston.

[0008] In some embodiments, the first air port group includes a first air intake port and a first air outlet symmetrically arranged on the cylinder body. The first air intake port and the first air outlet communicate with the inner cavity, and the first air intake port and the first air outlet are aligned in the direction of movement of the piston assembly.

[0009] In some embodiments, the second air port group includes a second air intake port and a second air outlet symmetrically arranged on the cylinder body. The second air intake port and the second air outlet communicate with the inner cavity, and the second air intake port and the second air outlet are aligned in the direction of movement of the piston assembly.

[0010] In some embodiments, an air inlet locking device is further included, which is respectively provided with a second air inlet and a second air outlet, and is used to lock the second air inlet and the second air outlet.

[0011] A second aspect of this application provides a control method for the compressor described above, comprising the following steps: Obtain the air pressure of the air tank in the braking system; and If the air pressure is lower than the first set value, the compressor is controlled to switch to the second mode.

[0012] In some embodiments, controlling the compressor to switch to the second mode when the air pressure is lower than a first preset value includes: When the compressor is running, wait for the compressor to stop running before controlling the compressor to switch to the second mode; when the compressor is not running, control the compressor to switch to the second mode.

[0013] In some embodiments, waiting for the compressor to stop operating includes: Once the temperature of the object being acted upon by the air conditioning system reaches the target temperature, the compressor is stopped, and the piston assembly is allowed to stop moving.

[0014] In some embodiments, controlling the compressor to switch to the second mode when the air pressure is lower than a first set value further includes: If the air pressure is lower than the second set value and the compressor is running, the compressor is immediately stopped and, after a set time, the compressor is switched to the second mode, where the second set value is less than the first set value.

[0015] A third aspect of this application provides an engineering machine including an air conditioning system, a braking system, a controller, and a compressor as described above. The braking system includes an air tank, and the controller is configured to perform the control method as described above.

[0016] In some embodiments, the braking system includes a brake compressor configured to supply air to an air tank when the air pressure is lower than a third set value, the third set value being greater than a first set value.

[0017] According to the technical solution provided in this application, by configuring the compressor to selectively compress refrigerant to supply air to the air conditioning system or compress air to supply air to the braking system, a dual-purpose compressor is achieved. When the compressor integrated into the braking system fails, this compressor can switch to the second mode to continue supplying compressed air to the braking system. Compared to the traditional solution of setting two independent air conditioning compressors and braking compressors, this solution can improve the redundancy, reliability, and safety of the braking system. Furthermore, compared to the solution of setting a backup air compressor for the braking system, this solution eliminates the need for a backup air compressor, thereby reducing the number of compressors in the entire unit, lowering the overall system cost and weight, optimizing the utilization of vehicle chassis space, and improving the overall vehicle layout. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this application, illustrate exemplary embodiments of this disclosure and are used to explain this disclosure, but do not constitute an undue limitation of this disclosure. In the drawings: Figure 1 This is a schematic diagram of a compressor in a first mode according to some embodiments of this application.

[0019] Figure 2 This is a schematic diagram of the compressor in a second mode according to some embodiments of this application.

[0020] Figure 3 This is a flowchart illustrating a compressor control method according to some embodiments of this application. Detailed Implementation

[0021] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0022] The terms "first," "second," and similar words used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "above," "below," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0023] In this disclosure, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0024] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0025] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0026] refer to Figure 1 and Figure 2 This application provides a compressor in some embodiments, including a cylinder assembly 1 and a piston assembly 2. The cylinder assembly 1 includes a cylinder body 11 and a first port group 12 and a second port group 13 disposed on the cylinder body 11. The first port group 12 is used to draw in a first gas and discharge the first gas to an air conditioning system. The second port group 13 is used to draw in a second gas and discharge the second gas to a braking system. The piston assembly 2 is movably disposed within the cavity of the cylinder body 11 to compress the gas. The piston assembly 2 includes a first piston 21 and a second piston 22. The first piston 21 and the second piston 22 are separable. The first port group 12 and the second port group 13 are spaced apart in the direction of movement of the piston assembly 2, and the first port group 12 is closer to the top dead center of the piston assembly 2 relative to the second port group 13. The compressor has a first mode and a second mode. Figure 1 As shown, in the first mode, the second air port assembly 13 is closed, the first piston 21 and the second piston 22 remain engaged, and the compressor draws in and exhausts air through the first air port assembly 12. Figure 2As shown, in the second mode, the second air port group 13 is opened, the first piston 21 and the second piston 22 are separated, the second piston 22 is fixed relative to the cylinder 11, and the position of the second piston 22 relative to the cylinder 11 is configured such that the first air port group 12 and the second air port group 13 are located on both sides of the second piston 22 in the moving direction of the piston assembly 2, and the second piston 22 isolates the inner cavity where the first air port group 12 is located from the inner cavity where the second air port group 13 is located. The compressor draws in and exhausts air through the second air port group 13.

[0027] Specifically, the first gas is a refrigerant gas (i.e., a refrigerant), such as Freon. The second gas is air. In the first mode, piston assembly 2 can compress the refrigerant gas to supply air to the air conditioning system, realizing the refrigerant circulation of the air conditioning system. In the second mode, piston assembly 2 can also compress air to supply air to the braking system, realizing the pneumatic braking of the braking system.

[0028] Both the first port group 12 and the second port group 13 include an intake port and an outlet port connected to the inner cavity (i.e., the compression chamber) of the cylinder 11. The intake port is used to introduce gas into the inner cavity of the cylinder 11, and the outlet port is used to discharge the compressed gas to the air conditioning system or the braking system. The first port group 12 is closer to the top dead center of the piston assembly 2 than the second port group 13, which makes the compressor have a stronger compression capacity for the refrigerant in the first mode. That is to say, the compressor is used as an air conditioning compressor and also serves as a supplementary compressed air supply to the braking system. The on / off state of the second port group 13 is controllable so that in the first mode, the first gas can only be discharged through the first port group 12 and not through the second port group 13. In the second mode, the first piston 21 and the second piston 22 are separated, with the first piston 21 being the moving piston and the second piston 22 being the stationary piston. The second piston 22 is fixed near the top dead center to isolate the first air port group 12 from the second air port group 13. Thus, when the first piston 21 reciprocates and compresses the second gas, the second gas can only be discharged through the second air port group 13 and not through the first air port group 12. It is worth noting that the stroke of the piston assembly 2 is adjustable, and the stroke of the piston assembly 2 in the first mode is greater than that in the second mode, so that in the second mode, the reciprocating movement of the first piston 21 will not collide with the second piston 22.

[0029] By configuring the compressor to selectively compress refrigerant to supply air to the air conditioning system or compress air to supply air to the braking system, a dual-purpose unit is achieved. When the compressor integrated into the braking system fails, this compressor can switch to the second mode to continue supplying compressed air to the braking system. Compared to the traditional solution of setting up two independent air conditioning compressors and braking compressors, this solution can improve the redundancy, reliability, and safety of the braking system. At the same time, compared to the solution of setting up a backup air compressor for the braking system, this solution does not require the installation of a backup air compressor, thereby reducing the number of compressors in the whole unit, reducing the total system cost and weight, optimizing the utilization of vehicle chassis space, and improving the overall vehicle layout.

[0030] It is worth noting that in some related technologies, two independent air conditioning compressors and braking compressors are installed on the chassis of construction machinery. When the ambient temperature is suitable and there is no need for cooling or heating, the air conditioning compressors are idle, resulting in low equipment utilization. However, according to this solution, only one dual-mode compressor can be installed on the chassis to simultaneously achieve cooling and braking functions.

[0031] In some embodiments, the compressor further includes a partition 3. The partition 3 is telescopically disposed within the housing wall 11a of the cylinder body 11. In a first mode, the partition 3 is retracted into the housing wall 11a. In a second mode, the partition 3 extends relative to the housing wall 11a into the inner cavity to engage with the second piston 22 to limit the second piston 22.

[0032] Specifically, an opening is provided on the shell wall 11a of the cylinder body 11 near the top dead center. The partition 3 is retractably disposed in the opening. In the first mode, the partition 3 is completely retracted into the opening, reducing interference with the reciprocating motion of the piston assembly 2, allowing the piston assembly 2 to move normally to the top dead center. The first piston 21 and the second piston 22 can be connected by a fitting or a snap-fit ​​mechanism, and in the connected state, there is a gap at the connection between the first piston 21 and the second piston 22. When switching from the first mode to the second mode, the piston assembly 2 first moves to the position of the partition 3, and then the partition 3 extends out from the opening, so that the partition 3 is inserted into the gap between the first piston 21 and the second piston 22 and snaps into the second piston 22. At this time, the second piston 22 is restricted from moving by the partition 3 and fixed relative to the cylinder body 11, achieving reliable locking of the second piston 22, while the second piston 22 can still move freely. The partition 3 can be driven electromagnetically. For example, a solenoid valve pushes the partition 3 to extend, and after the solenoid valve is de-energized, the partition 3 retracts by spring. The partition material can be high-strength alloy steel or surface-hardened metal to enhance its limiting effect on the second piston 22 and its ability to withstand the impact force of the second gas in the second mode.

[0033] In some embodiments, the first piston 21 and the second piston 22 each have end faces facing each other for interconnection. The end face of the second piston 22 is provided with a locking hole, and the end face of the first piston 21 is provided with a protrusion corresponding to the locking hole for insertion into the locking hole to achieve locking. In the first mode, the protrusion is inserted into the locking hole to form a concave-convex fit, thereby improving the stability of the first piston 21 and the second piston 22 after they are joined.

[0034] The solution in this embodiment uses a partition 3 for mechanical limiting, which has high reliability and is easy to modify on the existing cylinder body 11, with low manufacturing and maintenance costs.

[0035] In some embodiments, in the second mode, the partition 3 is engaged with the end face of the second piston 22 facing the first piston 21.

[0036] Specifically, the first piston 21 and the second piston 22 each have end faces facing each other for interconnection. After the piston assembly is separated, the end faces of the first piston 21 and the second piston 22 are exposed in the inner cavity. By engaging the partition 3 with the end face of the second piston 22, the limiting effect on the second piston 22 can be enhanced, so that in the second mode, the second piston 22 is better kept relatively fixed to the cylinder 11.

[0037] In some embodiments, a buffer pad or wear-resistant coating may be provided on the surfaces of the partition 3 and the second piston 22 that come into contact with each other to reduce wear on the partition 3 and the second piston 22.

[0038] In some embodiments, the baffle 3 includes a first baffle and a second baffle symmetrically disposed on both sides of the cylinder body 11, the first baffle and the second baffle being aligned in the moving direction of the piston assembly 2. Figure 1 As shown, in the first mode, the first and second partitions retract into their respective openings, as... Figure 2 As shown, in the second mode, the first partition and the second partition extend from their respective openings to engage with both sides of the end face of the second piston 22, further improving the stability of the second piston 22 in the second mode.

[0039] In some embodiments, the first air port group 12 includes a first air intake port 12a and a first air outlet port 12b symmetrically arranged on the cylinder body 11. The first air intake port 12a and the first air outlet port 12b communicate with the inner cavity, and are aligned in the moving direction of the piston assembly 2.

[0040] Specifically, the cylinder assembly also includes a cylinder head 14, which is located at one end of the cylinder body 11, and the piston assembly is assembled at the other end of the cylinder body 11. The cylinder head 14 and the cylinder body 11 cooperate to form the inner cavity of the compressor. The first intake port 12a and the first outlet port 12b are both located at the bottom end of the inner cavity of the cylinder body 11 (i.e., the end of the inner cavity near the cylinder head 14, which is also the end where the piston assembly 2 is located when it moves to top dead center). The first intake port 12a is connected to the refrigerant gas source through a pipeline, and the first outlet port 12b is connected to the condenser pipeline of the air conditioning system. The compressor draws in refrigerant through the first intake port 12a, and the piston assembly 2 compresses the refrigerant and discharges it to the air conditioning system through the first outlet port 12b.

[0041] In this embodiment, the first intake port 12a and the first outlet port 12b are located at the bottom of the inner cavity of the cylinder 11, which can increase the maximum stroke of the piston assembly 2 and improve the ability to compress the refrigerant, thereby improving the cooling or heating capacity of the air conditioning system. Aligning the first intake port 12a and the first outlet port 12b in the direction of movement of the piston assembly 2 can improve the pressure balance during compressor intake and exhaust.

[0042] In some embodiments, the second air port group 13 includes a second air intake port 13a and a second air outlet port 13b symmetrically arranged on the cylinder body 11. The second air intake port 13a and the second air outlet port 13b communicate with the inner cavity, and the second air intake port 13a and the second air outlet port 13b are aligned in the moving direction of the piston assembly 2.

[0043] Specifically, in the direction of movement of the piston assembly 2, the second intake port 13a and the second outlet port 13b are both located in the middle region of the inner cavity of the cylinder 11, so as to be spaced apart from the first intake port 12a and the first outlet port 12b. Thus, in the second mode, the second intake port 13a and the second outlet port 13b are located on the side of the second piston 22 away from the first port assembly 12, and the area between the first piston 21 and the second piston 22 forms an independent compression chamber. The second intake port 13a is used to draw in air, and the second outlet port 13b is connected to the dryer pipeline of the braking system. The compressor draws in air through the second intake port 13a, and after the second piston 22 compresses the air, it is discharged to the dryer of the braking system through the second outlet port 13b. After passing through the dryer, the compressed air enters the air storage tank. By aligning the second intake port 13a and the second outlet port 13b in the direction of movement of the piston assembly 2, the pressure balance during compressor intake and exhaust can be improved.

[0044] In some embodiments, the compressor further includes a port locking device 4. The port locking device 4 is respectively provided with respect to the second suction port 13a and the second discharge port 13b. The port locking device 4 is used to lock the second suction port 13a and the second discharge port 13b.

[0045] Specifically, the air port locking device 4 can be an electrically controlled valve, which includes a valve plate, an electromagnet, a push rod for driving the valve plate, and a spring mounted on the push rod. When the electrically controlled valve is energized, the electromagnet generates magnetic force, the valve plate is attracted and squeezes the spring, and closes the second air intake port 13a and the second air outlet port 13b. When the electrically controlled valve is de-energized, the magnetic force of the electromagnet disappears, the valve plate is reset by the spring, and the second air intake port 13a and the second air outlet port 13b are opened. Of course, the electrically controlled valve can also be configured such that when energized, the valve plate opens the second air intake port 13a and the second air outlet port 13b, and when de-energized, the valve plate closes the second air intake port 13a and the second air outlet port 13b.

[0046] In this embodiment, by setting the air port locking device 4, the sealing of the second air intake 13a and the second air outlet 13b can be guaranteed in the first mode, reducing the leakage of refrigerant from the second air intake 13a and the second air outlet 13b, and also reducing the process of air accidentally entering the inner cavity and interfering with the compression of the refrigerant.

[0047] refer to Figure 3 Some embodiments of this application also provide a control method for the compressor as described above, including the following steps: S1, obtain the air pressure of the air tank in the braking system; and S2, when the air pressure is lower than the first set value, controls the compressor to switch to the second mode.

[0048] Specifically, the first set value is a preset safety threshold. When the air pressure is lower than this value, it indicates that the air tank is not full. At this time, the compressor is controlled to switch to the second mode to replenish the air tank, increase the air storage capacity of the braking system, and ensure the reliability of the braking system. Therefore, the safety of the whole vehicle can be improved.

[0049] In some embodiments, when the pressure in the gas tank rises from a value less than a first set value to a value higher than the first set value, the compressor switches to a first mode to better meet the cooling demand.

[0050] In some embodiments, controlling the compressor to switch to the second mode when the air pressure is lower than a first preset value includes: S21: When the compressor is running, wait for the compressor to stop before controlling the compressor to switch to the second mode; when the compressor is not running, control the compressor to switch to the second mode.

[0051] Specifically, the first set value is configured such that when the pressure in the air tank is lower than the first set value, the remaining pressure in the air tank can still ensure that the braking system can brake for a certain period of time. In this way, when it is detected that the air tank pressure is lower than the first set value and air needs to be replenished, there can be a certain time margin. If the compressor is currently supplying air to the refrigeration system, it can wait until the compressor stops running before switching to the second mode. Compared with immediate mode switching, this solution can reduce the impact on the air conditioning system when the compressor switches modes and improve the overall lifespan of the system.

[0052] In some embodiments, waiting for the compressor to stop running includes: Once the temperature of the object being cooled by the air conditioning system reaches the target temperature, the compressor is stopped, and the piston assembly is allowed to stop moving.

[0053] Specifically, the air conditioning system can target spaces such as the driver's cab, passenger compartment, and equipment compartment. The target temperature can be the comfort temperature set by the air conditioning system. For example, the cooling task of the air conditioning system is to lower the temperature inside the driver's cab to 25°C. During the process of the compressor supplying air to the air conditioning system, if the air pressure is detected to be lower than the first set value, the compressor will continue to supply air to the air conditioning system until the temperature sensor inside the driver's cab detects that the temperature has dropped to 25°C. At this time, the vehicle controller controls the air conditioning system to stop cooling. At this point, the vehicle controller disconnects the compressor's drive source, allowing the compressor to naturally stop compressing and doing work. The rotor, crankshaft, and other components gradually coast down and eventually stop rotating completely. At this point, it is determined that the compressor has stopped running, and then the compressor is controlled to switch to the second mode.

[0054] In some embodiments, controlling the compressor to switch to the second mode when the air pressure is lower than a first preset value further includes: S22, if the air pressure is lower than the second set value and the compressor is running, immediately control the compressor to stop and control the compressor to switch to the second mode after a set time, where the second set value is less than the first set value.

[0055] Specifically, the second set value is numerically lower than the first set value. When the air pressure is lower than the second set value, it indicates that the remaining air pressure in the braking system can no longer maintain basic braking performance, posing a significant safety hazard. Priority should be given to ensuring air supply to the braking system. In this case, the compressor needs to be stopped immediately, and the system should switch to the second mode after a short set time (e.g., 0.5 to 2 seconds). By setting a short time interval before switching modes, the compressor can release residual pressure in its internal cavity and stop the piston, creating safe conditions for mode switching.

[0056] In this solution, the air supply to the braking system can be prioritized in emergency situations, thereby improving the safety and rationality of the control strategy.

[0057] In some embodiments, the control method further includes: receiving a mode switching instruction; responding to the mode switching instruction and controlling the compressor to switch from the current state to another state.

[0058] The mode switching command can be triggered by the driver controlling the switching switch. Alternatively, the mode switching command can be automatically triggered by the controller according to a preset program. For example, in some embodiments, the braking system has a brake compressor. When the brake compressor is working normally, the aforementioned dual-mode compressor remains in the first mode. When the brake compressor malfunctions, the controller automatically controls the dual-mode compressor to switch to the second mode. Some embodiments of this application also provide an engineering machine, including an air conditioning system, a braking system, a controller, and the aforementioned compressor. The braking system includes an air tank, and the controller is configured to execute the aforementioned control method.

[0059] Specifically, the construction machinery can be cranes, loaders, bulldozers, forklifts, mining dump trucks, etc. According to the scheme of this embodiment, the aforementioned dual-mode compressor is an air conditioning compressor. In addition to the air conditioning compressor, the construction machinery also has a dedicated brake compressor for the braking system. When the brake compressor is functioning properly, it replenishes the air tank in a timely manner, ensuring that the air pressure in the air tank is always maintained at a high level. The air conditioning compressor is in the first mode by default, supplying air to the air conditioning system. When the brake compressor malfunctions, it cannot replenish the air tank in a timely manner, and the air pressure in the air tank will gradually decrease. When the air pressure drops below a first set value, step S2 is triggered, and the air conditioning compressor switches to the second mode to supply air to the braking system.

[0060] According to the solution in this embodiment, the backup compressor in the braking system can be eliminated. The engineering machinery only needs to be equipped with two compressors to improve the redundancy of the braking system, reduce the weight and manufacturing cost of the whole machine, and improve the safety and reliability of the whole machine.

[0061] In some embodiments, the brake compressor is configured to supply air to the air tank when the air pressure is lower than a third set value, the third set value being greater than a first set value.

[0062] Specifically, the third setpoint is numerically greater than the first setpoint. This ensures that the air tank pressure will not drop to the first setpoint when the brake compressor is functioning correctly. Once the air tank pressure drops to the first setpoint, it indicates a brake compressor malfunction, and only then will the air conditioning compressor switch modes. This solution reduces unnecessary switching actions, ensures air supply redundancy, and improves the reliability and fault tolerance of the braking system.

[0063] Based on the embodiments disclosed above, in the absence of explicit denial or conflict, the technical features of one embodiment may be advantageously combined with one or more other embodiments.

[0064] This document uses specific embodiments to illustrate the principles and implementation methods of this disclosure. The descriptions of the embodiments above are only for the purpose of helping to understand the methods and core ideas of this disclosure. It should be noted that those skilled in the art can make various improvements and modifications to this disclosure without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this disclosure.

Claims

1. A compressor, characterized in that, include: A cylinder assembly (1) includes a cylinder body (11) and a first port group (12) and a second port group (13) disposed on the cylinder body (11). The first port group (12) is used to draw in a first gas and discharge the first gas to an air conditioning system, and the second port group (13) is used to draw in a second gas and discharge the second gas to a braking system. A piston assembly (2) is movably disposed within the cavity of the cylinder (11) to compress gas. The piston assembly (2) includes a first piston (21) and a second piston (22), which are separable. A first air port group (12) and a second air port group (13) are spaced apart in the moving direction of the piston assembly (2), and the first air port group (12) is closer to the top dead center of the piston assembly (2) than the second air port group (13). The compressor has a first mode and a second mode. In the first mode, the second port group (13) is closed, the first piston (21) and the second piston (22) remain engaged, and the compressor draws in and exhausts air through the first port group (12). In the second mode, the second port group (13) is open, the first piston (21) and the second piston (22) are separated, and the second piston (22) is relatively fixed to the cylinder (11). The position of the second piston (22) and the cylinder (11) being relatively fixed is configured such that the first port group (12) and the second port group (13) are located on both sides of the second piston (22) in the moving direction of the piston assembly (2), and the second piston (22) isolates the inner cavity where the first port group (12) is located from the inner cavity where the second port group (13) is located. The compressor draws in and exhausts air through the second port group (13).

2. The compressor according to claim 1, characterized in that, It also includes a partition (3) which is telescopically disposed in the shell wall (11a) of the cylinder body (11). In the first mode, the partition (3) is retracted into the shell wall (11a). In the second mode, the partition (3) extends out of the inner cavity relative to the shell wall (11a) to engage with the second piston (22) to limit the second piston (22).

3. The compressor according to claim 2, characterized in that, In the second mode, the partition (3) is engaged with the end face of the second piston (22) facing the first piston (21).

4. The compressor according to any one of claims 1 to 3, characterized in that, The first air port group (12) includes a first air intake port (12a) and a first air outlet port (12b) symmetrically arranged on the cylinder body (11). The first air intake port (12a) and the first air outlet port (12b) communicate with the inner cavity, and the first air intake port (12a) and the first air outlet port (12b) are aligned in the moving direction of the piston assembly (2).

5. The compressor according to any one of claims 1 to 3, characterized in that, The second air port group (13) includes a second air intake port (13a) and a second air outlet port (13b) symmetrically arranged on the cylinder body (11). The second air intake port (13a) and the second air outlet port (13b) communicate with the inner cavity, and the second air intake port (13a) and the second air outlet port (13b) are aligned in the moving direction of the piston assembly (2).

6. The compressor according to claim 5, characterized in that, It also includes an air inlet locking device (4), which is respectively provided with the second air inlet (13a) and the second air outlet (13b). The air inlet locking device (4) is used to lock the second air inlet (13a) and the second air outlet (13b).

7. A control method for a compressor based on any one of claims 1 to 6, characterized in that, Includes the following steps: Obtain the air pressure of the air tank in the braking system; and If the air pressure is lower than the first set value, the compressor is controlled to switch to the second mode.

8. The control method according to claim 7, characterized in that, When the air pressure is lower than the first set value, controlling the compressor to switch to the second mode includes: When the compressor is running, wait for the compressor to stop running before controlling the compressor to switch to the second mode; when the compressor is not running, control the compressor to switch to the second mode.

9. The control method according to claim 8, characterized in that, Waiting for the compressor to stop running includes: Once the temperature of the object being acted upon by the air conditioning system reaches the target temperature, the compressor is stopped, and the piston assembly is allowed to stop moving.

10. The control method according to claim 8, characterized in that, When the air pressure is lower than the first set value, controlling the compressor to switch to the second mode further includes: If the air pressure is lower than the second set value and the compressor is running, the compressor is immediately stopped and, after a set time, the compressor is switched to the second mode, where the second set value is less than the first set value.

11. An engineering machinery, characterized in that, The system includes an air conditioning system, a braking system, a controller, and a compressor as described in any one of claims 1 to 6, wherein the braking system includes the air tank, and the controller is configured to perform the control method as described in any one of claims 7 to 10.

12. The engineering machinery according to claim 11, characterized in that, The braking system further includes a brake compressor configured to supply air to the air tank when the air pressure is lower than a third set value, the third set value being greater than the first set value.

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