Method for ice control and detection of a brake air circuit and working machine

Abstract

The application relates to the technical field of working machines, and provides a freezing control and detection method for a brake air circuit and a working machine. In the freezing control and detection method for the brake air circuit, the working machine is controlled to start a cycle air intake and exhaust mode in a first state. Specifically, the working machine in a low-temperature environment and in a shutdown or off state can automatically enter the cycle air intake and exhaust mode. When the working machine enters the cycle air intake and exhaust mode, the brake air circuit can realize cycle air intake and exhaust. The brake air circuit includes but is not limited to an air pipe, a brake control valve and the like. That is to say, in the cycle air intake and exhaust mode, high-pressure gas is continuously introduced into and discharged from the brake air circuit, so that water, ice chips and the like in the brake air circuit are taken out or blown out in time, and freezing and blocking faults in the brake air circuit are prevented. Therefore, the normal operation of the working machine running brake action can be ensured, and the running safety of the working machine is improved.

Description

Technical Field

[0001] This invention relates to the field of work machinery technology, and in particular to a method for controlling and detecting icing in brake air circuits and work machinery. Background Technology

[0002] Currently, pneumatic braking systems are frequently used as braking systems for heavy-duty trucks and other work machinery. In a pneumatic braking system, an air compressor compresses external air and delivers it to each brake chamber via a brake control valve to perform the corresponding braking action. Because air contains a certain amount of moisture and the air dryer in the pneumatic braking system has limited drying and filtration capabilities, moisture accumulates inside the brake air circuit, including the air pipes and valve bodies. When work machinery is parked in a low-temperature environment, this moisture in the brake pipes and valve bodies can easily freeze. When the work machinery is restarted, icing and blockages may occur in the brake air circuit, preventing normal braking and thus affecting the safety of the work machinery. Summary of the Invention

[0003] This invention provides a method and machinery for controlling and detecting icing in the brake air circuit, which solves or improves the problem that brake air circuit icing and blockage easily occurs when machinery that has been stopped for a long time in a low-temperature environment is restarted, preventing normal driving braking and affecting driving safety.

[0004] According to a first aspect of the present invention, a method for controlling and detecting icing in a brake air circuit is provided, comprising the following steps:

[0005] When the operating machinery is in its first state, the control starts the circulating intake and exhaust mode.

[0006] The first state refers to the state of being shut down in a low-temperature environment; in the circulating intake and exhaust mode, the brake air circuit circulates intake and exhaust to blow out moisture and ice chips in the brake air circuit.

[0007] According to the present invention, an icing control and detection method for a brake air circuit is provided, the icing control and detection method further includes:

[0008] When the operating machinery restarts in the first state, the control starts the brake air circuit detection mode.

[0009] In the brake air circuit detection mode, the brake air circuit sequentially performs air intake and exhaust to determine the flow state of the brake air circuit.

[0010] According to the present invention, a method for controlling and detecting icing in a brake air circuit, wherein the step of controlling and activating a circulating intake and exhaust mode in the first state of the operating machinery specifically includes:

[0011] When the operating machinery is in the first state, it controls the service brake control valve to cycle between the service brake position and the service brake release position.

[0012] Specifically, in the service brake position, the service brake air reservoir supplies air to the service brake chamber through the service brake control valve and the EBS valve; in the service brake release position, the air in the service brake chamber is discharged through the EBS valve.

[0013] The service brake control valve is used to control the working state of the EBS valve.

[0014] According to the present invention, a method for controlling and detecting icing in a brake air circuit, wherein the working machinery, in the first state, controls the service brake control valve to cyclically switch between the service brake position and the service brake release position, specifically includes:

[0015] In the first state, the operating machinery controls the service brake control valve to switch to the service brake release position after maintaining the service brake position for a first preset time, and then switches back to the service brake position after maintaining the service brake release position for a second preset time, thus continuously cycling.

[0016] According to the present invention, an icing control and detection method for brake air circuits is provided, wherein an ambient temperature below 0°C is identified as a low-temperature environment, and a shutdown state is identified as a situation where the wheel speed is 0 and the drive system stops operating for a duration greater than or equal to a third preset duration.

[0017] The second preset duration is positively correlated with the ambient temperature.

[0018] According to the present invention, a method for controlling and detecting icing in a brake air circuit, wherein the step of controlling and activating a circulating intake and exhaust mode in the first state of the operating machinery further includes:

[0019] When the pressure in the service brake air reservoir is lower than the first preset pressure, the control cycle intake and exhaust mode stops operating.

[0020] According to the present invention, a method for controlling and detecting icing in a brake air circuit, wherein when the working machinery is restarted in the first state, the step of controlling the activation of the brake air circuit detection mode specifically includes:

[0021] When the operating machinery is restarted in the first state, the control valve of the service brake is switched to the service brake position to detect the charging speed of the service brake air chamber and the maximum pressure value that can be achieved.

[0022] Control the service brake control valve to switch to the service brake release position to detect the exhaust speed at which the service brake air chamber is depressurized to 0;

[0023] The flow state of the brake air circuit is determined based on the charging speed of the brake chamber, the maximum pressure value that can be achieved, and the exhaust speed at which the pressure is reduced to 0.

[0024] According to the present invention, a method for controlling and detecting icing in a brake air circuit, the step of determining the flow state of the brake air circuit based on the charging rate of the service brake chamber, the maximum achievable pressure value, and the exhaust rate to zero specifically includes:

[0025] When the charging speed, the maximum pressure value that can be achieved, and the exhaust speed to 0 in the service brake chamber are all within the corresponding set thresholds, the flow state of the brake air circuit is determined to be normal.

[0026] When one or more of the following are outside the corresponding set thresholds: the charging speed of the service brake chamber, the maximum pressure value that can be reached, and the exhaust speed at which the pressure is released to 0, the abnormal flow state of the brake air circuit is determined, and the brake air circuit icing warning system is activated.

[0027] According to the present invention, an icing control and detection method for a brake air circuit is provided, the icing control and detection method further includes:

[0028] Detect the actual number of backflushing cycles of the air dryer;

[0029] When the actual number of backflushing cycles is greater than or equal to the lifespan limit of the air dryer, the dryer replacement warning system is activated.

[0030] According to a second aspect of the present invention, a working machine is provided for performing icing control and detection operations on the brake air circuit using the method described above.

[0031] In the icing control and detection method for brake air circuits provided by this invention, the operating machinery, in a first state, controls and activates a circulating intake and exhaust mode. Specifically, operating machinery in a low-temperature environment that is stopped or turned off can automatically enter the circulating intake and exhaust mode. When the operating machinery enters the circulating intake and exhaust mode, the brake air circuit can achieve circulating intake and exhaust. The brake air circuit includes, but is not limited to, air pipes and brake control valves. That is, in the circulating intake and exhaust mode, high-pressure gas continuously enters and exits the brake air circuit to promptly remove or blow out moisture and ice particles, preventing icing blockages and other malfunctions within the brake air circuit. This ensures the normal operation of the operating machinery's braking system, thereby improving the operating safety of the machinery. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in this invention or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a flowchart of the method for controlling and detecting icing in a brake air circuit provided by the present invention;

[0034] Figure 2 This is a simplified structural diagram of the braking system in the working machinery provided by the present invention;

[0035] Figure label:

[0036] 100. Air compressor; 200. Air dryer; 300. Service brake air reservoir; 400. Service brake control valve; 500. Service brake air chamber; 600. Air pressure sensor; 700. Control module; 800. EBS valve. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0038] In the description of the embodiments of the present invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0040] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] The following is combined with Figure 1 and Figure 2 This invention describes a method and machinery for controlling and detecting icing in a brake air circuit. It should be understood that the following description is merely an illustrative embodiment of the invention and does not constitute any particular limitation on the invention.

[0043] An embodiment of the first aspect of the present invention provides a method for controlling and detecting icing in a brake air circuit, such as... Figure 1 As shown, it includes the following steps:

[0044] When the operating machinery is in the first state, the control starts the circulating intake and exhaust mode;

[0045] The first state refers to the state of being stopped in a low-temperature environment; in the circulating intake and exhaust mode, the brake air circuit circulates intake and exhaust to blow out moisture and ice chips in the brake air circuit.

[0046] In the icing control and detection method for brake air circuits provided by this invention, the operating machinery, in a first state, controls and activates a circulating intake and exhaust mode. Specifically, operating machinery in a low-temperature environment that is stopped or turned off can automatically enter the circulating intake and exhaust mode. When the operating machinery enters the circulating intake and exhaust mode, the brake air circuit can achieve circulating intake and exhaust. The brake air circuit includes, but is not limited to, air pipes and brake control valves. That is to say, in the circulating intake and exhaust mode, high-pressure gas continuously enters and exits the brake air circuit to promptly carry out or blow out moisture and ice particles within the brake air circuit, preventing icing blockages and other malfunctions within the brake air circuit. This ensures the normal operation of the operating machinery's braking system, thereby improving the operating safety of the operating machinery.

[0047] In one embodiment of the present invention, the step of controlling the activation of the circulating intake and exhaust mode of the operating machinery in the first state specifically includes:

[0048] When the operating machinery is in the first state, the control valve 400 is controlled to cycle between the service brake position and the service brake release position.

[0049] In the service brake position, the service brake air reservoir 300 supplies air to the service brake air chamber 500 through the service brake control valve 400 and the EBS valve 800; in the service brake release position, the air in the service brake air chamber 500 is discharged through the EBS valve 800.

[0050] Among them, the service brake control valve 400 is used to control the working state of the EBS valve 800.

[0051] Specifically, Figure 2The diagram shows a simplified schematic of the braking system of the operating machinery. In this embodiment, the air compressor 100 pressurizes air from the external environment and delivers it to the air dryer 200 for drying and filtration. The air output from the air dryer 200 is diverted to at least the service brake air reservoir 300 and the parking brake air reservoir via a circuit protection valve. The icing control and detection method for the brake air circuit provided by this invention primarily targets the service brake system of the operating machinery. In this embodiment, the service brake air reservoir 300 is connected to the service brake control valve 400 and the EBS valve 800. The EBS valve 800 is connected to the service brake air chamber 500, and the service brake control valve 400 can control the operating state of the EBS valve 800, allowing the service brake air reservoir 300 to communicate with the service brake air chamber 500 to fill it with air, or allowing the service brake air chamber 500 to communicate with the exhaust port of the EBS valve 800 to discharge the gas inside the service brake air chamber 500. For example, the service brake control valve 400 can switch between a service brake position and a service brake release position. When the service brake control valve 400 switches to the service brake position, it connects the air inlet of the EBS valve 800 to the service brake chamber 500, allowing gas from the service brake chamber connected to the EBS valve 800's air inlet to be delivered into the service brake chamber 500 for service braking. When the service brake control valve 400 switches to the service brake release position, it connects the exhaust port of the EBS valve 800 to the service brake chamber 500, allowing gas from inside the service brake chamber 500 to be discharged to the external environment through the EBS valve 800, thus releasing the service brake.

[0052] When the operating machinery is in a low-temperature environment and is in a shut-off state, the automatic circulation intake and exhaust mode is activated. Specifically, the service brake control valve 400 is cyclically switched between the service brake position and the service brake release position. As a result, the high-pressure gas in the service brake air reservoir 300 can enter the service brake air chamber 500 through the brake air passage, and the gas in the service brake air chamber 500 can be discharged to the external environment through the brake air passage. This continuous circulation ensures that moisture or ice particles in the brake air passage are constantly blown out or carried away. This significantly reduces the possibility of ice formation and blockage in the brake air passage.

[0053] The aforementioned service brake air reservoir 300 includes a front service brake air reservoir and a rear service brake air reservoir, and the service brake air chamber 500 includes a front service brake air chamber and a rear service brake air chamber. The front service brake air reservoir is used to supply air to the front service brake air chamber, and the rear service brake air reservoir is used to supply air to the rear service brake air chamber.

[0054] Furthermore, in one embodiment of the present invention, the step of controlling the service brake control valve 400 to cycle between the service brake position and the service brake release position in the first state of the working machinery specifically includes:

[0055] In the first state, the operating machinery controls the service brake control valve 400 to switch from the service brake position to the service brake release position after maintaining it in the service brake position for a first preset time, and then switches back to the service brake position after maintaining it in the service brake release position for a second preset time, thus continuously cycling.

[0056] Furthermore, in one embodiment of the present invention, an environment with an ambient temperature below 0°C is identified as a low-temperature environment; and a state of shutdown is identified when the wheel speed is 0 and the duration of the drive system being stopped is greater than or equal to a third preset duration.

[0057] The second preset duration is positively correlated with the ambient temperature; that is, the lower the ambient temperature, the shorter the second preset duration.

[0058] For example, the work machinery is equipped with a temperature sensor that can detect the temperature of the external environment. For instance, when the external temperature is below 0°C, it is considered a low-temperature environment. When the wheel speed is 0, the work machinery can be considered to be in a stopped state, i.e., not moving, and the drive system remains stationary, meaning the work machinery is considered to be in a shut-off state. Since the brake air circuit is more prone to icing and blockage when the work machinery is in a low-temperature environment and stationary for an extended period, a third preset time is used to confirm that the work machinery is in a stopped or shut-off state. The third preset time can be set automatically based on factors such as the external ambient temperature. For example, when the external temperature is below 0°C, the vehicle speed is 0, and the drive system remains stationary for more than 15 minutes, the work machinery is determined to be in the first state, at which point the recirculating intake and exhaust mode is activated.

[0059] When the working machinery is in the first state, the control valve 400 is switched from the service brake position to the service brake release position after being held in the service brake position for a first preset time, and then switched back to the service brake position after being held in the service brake release position for a second preset time, and so on continuously.

[0060] It should be noted that the service brake control valve 400 is a proportional switching valve. The first preset duration is the time required for the service brake control valve 400 to completely switch from the service brake release position to the service brake position. The second preset duration is the time interval between two adjacent intake and exhaust processes. The setting of the second preset duration is related to the ambient temperature. The lower the ambient temperature, the greater the risk of icing in the brake air circuit. In this case, it is necessary to reduce the time interval between two adjacent intake and exhaust processes to reduce the risk of icing in the brake air circuit. For example, when the ambient temperature is -10℃, the brake air circuit is subjected to intake and exhaust operations once every 60 minutes; when the ambient temperature is -20℃, the brake air circuit is subjected to intake and exhaust operations once every 30 minutes; when the ambient temperature is -30℃, the brake air circuit is subjected to intake and exhaust operations once every 15 minutes.

[0061] For example, when the working machinery is electric, the drive system includes a drive motor; when the working machinery is fuel-powered, the drive system includes an engine.

[0062] Furthermore, in another embodiment of the present invention, the step of controlling the start of the circulating intake and exhaust mode in the first state of the working machinery further includes:

[0063] When the pressure in the service brake air reservoir 300 is lower than the first preset pressure, the control cycle intake and exhaust mode stops operating.

[0064] When the operating machinery is in a powered-off state, the air compressor 100 is de-energized. When the gas pressure in the service brake air reservoir 300 is lower than the first preset pressure, it indicates that there is insufficient gas in the service brake air reservoir 300. At this time, the control cycle intake and exhaust mode stops operating. Specifically, the service brake control valve 400 is switched and held until the service brake is released.

[0065] The braking control system of the operating machinery includes a control module 700, a vehicle speed detection device, a drive system operating status detection device, and a pressure sensor 600. The vehicle speed detection device detects the operating speed of the operating machinery, the drive system operating status detection device detects the operating status of the operating machinery's drive system, and the pressure sensor 600 detects the pressure in the service brake air reservoir 300 and the service brake air chamber 500. The control module 700 is connected to a temperature sensor, the vehicle speed detection device, the drive system operating status detection device, the pressure sensor 600, and the service brake control valve 400, and can control the operating status of the service brake control valve 400 based on the operating status of the temperature sensor, the vehicle speed detection device, the drive system operating status detection device, and the pressure sensor 600 to perform the aforementioned operations.

[0066] In one embodiment of the present invention, the icing control and detection method further includes:

[0067] When the operating machinery restarts in the first state, the control starts the brake air circuit detection mode.

[0068] In the brake air circuit detection mode, the brake air circuit is sequentially inlet and outlet to determine the flow status of the brake air circuit.

[0069] Furthermore, in one embodiment of the present invention, when the working machinery is restarted in the first state, the step of controlling the start of the brake air circuit detection mode specifically includes:

[0070] When the working machinery restarts in the first state, the control valve 400 is switched to the service brake position to detect the charging speed of the service brake air chamber 500 and the maximum pressure value that can be achieved.

[0071] Control the service brake control valve 400 to switch to the service brake release position to detect the exhaust speed of the service brake air chamber 500 when the pressure is reduced to 0.

[0072] The flow state of the brake air circuit is determined based on the charging speed of the service brake air chamber 500, the maximum pressure value that can be achieved, and the exhaust speed at which the pressure is reduced to 0.

[0073] Furthermore, in one embodiment of the present invention, the step of determining the flow state of the brake air passage based on the charging speed of the service brake chamber 500, the maximum achievable pressure value, and the exhaust speed at which the pressure is reduced to zero specifically includes:

[0074] When the charging speed of the service brake chamber 500, the maximum pressure value that can be achieved, and the exhaust speed to 0 are all within the corresponding set thresholds, the flow state of the brake air circuit is determined to be normal.

[0075] When one or more of the following are outside the corresponding set thresholds: the charging speed of the service brake air chamber 500, the maximum pressure value that can be achieved, and the exhaust speed at which the pressure is reduced to 0, the abnormal flow state of the brake air circuit is determined, and the brake air circuit icing warning system is activated.

[0076] To further ensure that the service brakes are in normal condition after the machinery is restarted in the first state, check whether there is any icing or blockage in the brake air circuit before the vehicle is driven.

[0077] For example, after the operating machinery restarts in its first state, the service brake chamber 500 is first inflated; that is, the service brake operation is performed first. Specifically, the inflation speed within the service brake chamber 500 is detected. This can be determined by the time required for the air pressure in the service brake chamber 500 to rise from 0 to the maximum stable air pressure. If the time required for the air pressure in the service brake chamber 500 to rise from 0 to the maximum stable air pressure is greater than a preset rise time, it indicates that the pressure build-up in the service brake chamber 500 is slow, and its brake air circuit may be experiencing icing blockage. Simultaneously, the maximum stable air pressure value that the service brake chamber 500 can establish is detected. If the maximum stable air pressure value that the service brake chamber 500 can establish is outside the preset maximum stable air pressure threshold, then the brake air circuit may be experiencing icing blockage.

[0078] Subsequently, the service brake chamber 500 is vented, that is, the service brake is released. Specifically, the venting speed of the service brake chamber 500 is detected. This can be determined by measuring the time required for the service brake chamber 500 to vent from its maximum stable pressure value to zero pressure. If the time required for the service brake chamber 500 to vent from its maximum stable pressure value to zero pressure is greater than the preset venting time, the brake air circuit is venting too slowly, which may indicate icing or blockage.

[0079] In specific judgment, if the service brake chamber 500 can be pressurized to the maximum stable air pressure threshold during the service braking process, and its pressurization rate is within the preset pressurization rate threshold, and simultaneously, if the service brake chamber 500 can be depressurized to zero pressure during the service brake release process, and its depressurization rate is within the preset depressurization threshold, then the brake air circuit is determined to be in a normal state, meaning that there is no icing or blockage in the brake air circuit, and the operating machinery can operate normally. If either of these conditions is not met, the brake air circuit is determined to be in an abnormal state, and icing or blockage may occur. In this case, the control module 700 can activate the brake air circuit icing warning system. The brake air circuit icing warning system includes an alarm bell or flashing alarm light, etc.

[0080] In another embodiment of the present invention, the icing control and detection method further includes:

[0081] Test the actual number of backflushing cycles of the air dryer 200;

[0082] If the actual number of backflushing cycles is greater than or equal to the lifespan limit of the air dryer 200, the dryer replacement warning system will be activated.

[0083] In the braking system of the operating machinery, an air dryer 200 is installed at the rear end of the air compressor. The air dryer 200 is used to filter moisture and other impurities from the air output gas of the air compressor. During use, the air dryer 200 needs to be backflushed periodically to remove impurities. When the backflushing operation of the air dryer 200 reaches its lifespan limit, its internal desiccant regeneration function will be affected, thus impacting its drying effect. When the actual number of backflushing operations is greater than or equal to the lifespan limit of the air dryer 200, a dryer replacement warning system is activated to prompt personnel to replace the air dryer 200 in a timely manner. For example, the dryer replacement warning system may also include a warning light and / or a warning bell. This improves the dryness of the air in the braking air circuit and reduces the possibility of icing and blockage within the braking air circuit.

[0084] It should be noted that the actual number of backflushing cycles of the air dryer can be automatically counted or estimated based on the specific mileage of the operating machinery or the terrain of the commonly used driving routes.

[0085] In summary, the icing control and detection method provided by this invention reduces the risk of icing blockage in the brake air circuit under low-temperature conditions and improves the driving safety of the operating machinery by three aspects: circulating air intake and exhaust to disperse and remove moisture and ice debris when the operating machinery is in a low-temperature environment and is turned off; charging and deflating the brake air chamber 500 to detect the brake air circuit when restarting the machine in a low-temperature environment and the brake air circuit is tested; and backflushing monitoring of the air dryer 200 during daily use.

[0086] A second aspect of the present invention provides a working machine for controlling and detecting icing of the brake air circuit using the method described above.

[0087] For example, in one embodiment of the present invention, the above-mentioned operating machinery includes heavy trucks.

[0088] It should be noted that the above embodiment is merely an illustrative example of the present invention and should not be construed as limiting the invention in any way. In other embodiments of the present invention, the aforementioned operating machinery may also include excavators, cranes, etc.

[0089] Furthermore, since this machine can perform icing control and detection operations on the brake air circuit in the manner described above, it also possesses the advantages mentioned above.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling and detecting icing in a brake air circuit, characterized in that, Includes the following steps: When the operating machinery is in the first state, the control starts the cyclic intake and exhaust mode, and controls the service brake control valve to cycle between the service brake position and the service brake release position. The first state refers to the state of being shut down in a low-temperature environment; in the circulating intake and exhaust mode, the brake air circuit circulates intake and exhaust to blow out the moisture and ice chips in the brake air circuit. When the operating machinery is restarted in the first state, the brake air circuit detection mode is activated. In the brake air circuit detection mode, the brake air circuit sequentially performs air intake and exhaust to determine the flow state of the brake air circuit.

2. The method for icing control and detection in brake air circuits according to claim 1, characterized in that, When the vehicle is in the service brake position, the service brake air reservoir supplies air to the service brake chamber through the service brake control valve and the EBS valve; when the vehicle is in the service brake release position, the air in the service brake chamber is discharged through the EBS valve. The service brake control valve is used to control the working state of the EBS valve.

3. The method for icing control and detection in brake air circuits according to claim 2, characterized in that, In the first state, the step of controlling the service brake control valve to cycle between the service brake position and the service brake release position in the operating machinery specifically includes: In the first state, the operating machinery controls the service brake control valve to switch to the service brake release position after maintaining the service brake position for a first preset time, and then switches back to the service brake position after maintaining the service brake release position for a second preset time, thus continuously cycling.

4. The method for icing control and detection in brake air circuits according to claim 3, characterized in that, The environment is defined as a low-temperature environment when the ambient temperature is below 0°C, and the shutdown state is defined as a situation where the wheel speed is 0 and the drive system remains stopped for a duration greater than or equal to a third preset duration. The second preset duration is positively correlated with the ambient temperature.

5. The method for icing control and detection in brake air circuits according to claim 4, characterized in that, In the first state, the step of controlling the start of the circulating intake and exhaust mode of the operating machinery also includes: When the pressure in the service brake air reservoir is lower than the first preset pressure, the control cycle intake and exhaust mode stops operating.

6. The method for icing control and detection in a brake air circuit according to claim 1, characterized in that, When the operating machinery restarts in the first state, the steps for controlling the activation of the brake air circuit detection mode specifically include: When the operating machinery is restarted in the first state, the control valve of the service brake is switched to the service brake position to detect the charging speed of the service brake air chamber and the maximum pressure value that can be achieved. Control the service brake control valve to switch to the service brake release position to detect the exhaust speed at which the service brake air chamber is depressurized to 0; The flow state of the brake air circuit is determined based on the charging speed of the brake chamber, the maximum pressure value that can be achieved, and the exhaust speed at which the pressure is reduced to 0.

7. The method for icing control and detection in a brake air circuit according to claim 6, characterized in that, The step of determining the flow state of the brake air circuit based on the charging speed of the service brake chamber, the maximum pressure value that can be achieved, and the exhaust speed to zero specifically includes: When the charging speed, the maximum pressure value that can be achieved, and the exhaust speed to 0 in the service brake chamber are all within the corresponding set thresholds, the flow state of the brake air circuit is determined to be normal. When one or more of the following are outside the corresponding set thresholds: the charging speed of the service brake chamber, the maximum pressure value that can be reached, and the exhaust speed at which the pressure is released to 0, the abnormal flow state of the brake air circuit is determined, and the brake air circuit icing warning system is activated.

8. The method for controlling and detecting icing in a brake air circuit according to any one of claims 1 to 7, characterized in that, The icing control and detection method also includes: Detect the actual number of backflushing cycles of the air dryer; When the actual number of backflushing cycles is greater than or equal to the lifespan limit of the air dryer, the dryer replacement warning system is activated.

9. A type of operating machinery, characterized in that, The icing control and detection operation of the brake air circuit is performed by any one of claims 1 to 8.

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