A pumping system based on automobile air path detection and a control method thereof

Abstract

The present application relates to the technical field of gas leakage detection, in particular to a kind of based on automobile gas path detection pumping system and its control method, pumping system includes: structural parameter acquisition module, structural path construction module, candidate path screening module, flow state judging module and detection channel switching module.In the present application, by collecting the parameters such as channel length, diameter and node space coordinates in gas path, the path structure with direction and connection relationship is constructed, the accurate modeling ability of complex gas path is improved, the unreasonable connection path is excluded by taking angle connection and diameter matching as screening standard, the detection path screening precision is optimized, the gas flow stability is analyzed combined with flow velocity fluctuation index, the accuracy of path judgment is improved from dynamic level, the shortest path in total length is preferred when configuring detection channel, response delay and energy consumption are reduced, multidimensional processing from structure identification to flow state analysis is realized as a whole, and the leakage detection efficiency and reliability under the complex commercial vehicle gas path environment are enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas leakage detection, in particular to a gas filling system based on automobile gas path detection and a control method thereof. BACKGROUND

[0002] Gas leakage detection technology belongs to the category of vehicle detection and diagnosis, mainly aiming at monitoring and identifying possible leakage conditions in closed or semi-closed gas pipeline systems, which includes gas pressure change monitoring, gas flow stability judgment, leakage location positioning and gas path state identification, etc. The detection system is usually constructed by setting up gas source stabilizing devices, detection sensors and signal analysis circuits, and the detection process is completed under certain conditions by combining control strategies. The traditional automobile gas path detection system is mainly used to identify possible gas path leakage problems during vehicle use, involving leakage detection function, detection driving and switching control mode, gas flow or pressure change monitoring means, and engine stop state electric control system cooperation logic. In the engine running state, the system monitors the pressure change through a single fixed channel connected to the pressure sensor, and judges whether there is leakage by combining timing logic and fixed threshold value, and completes the diagnosis by acquiring data in a static sampling mode according to the engine control unit setting detection time sequence.

[0003] In the traditional gas path detection, a fixed channel and a single sensor are generally used to build a detection path, which lacks comprehensive modeling of the actual gas path structure geometric parameters, resulting in path identification limited to pre-set channels, which is difficult to adapt to changes caused by individualization or later modification of vehicle structure. The static sampling method relies on fixed threshold setting to judge pressure changes, which is difficult to accurately identify subtle leakage signals when facing variable gas flow conditions, and there is a high risk of misjudgment or omission. The path selection process does not involve structure optimization or path connectivity screening, which may cause long detection path, detour phenomenon, increase detection delay, and affect diagnosis efficiency. When detecting in the engine stop state, the existing system lacks analysis of the dynamic changes of flow rate, which makes it difficult to accurately judge whether the gas flow is in a stable state, affecting the credibility of the detection result. For example, in a multi-branch gas path system, if a micro-leakage occurs at the end of a branch, the fixed channel path may have no effective detection response due to flow direction difference, causing hidden danger omission and further affecting the safety of vehicle operation. The path selection and detection means of the existing system lack fine parameter support, which limits the improvement of overall diagnosis performance. SUMMARY

[0004] To solve the technical problems existing in the prior art, the present application provides a gas filling system based on automobile gas path detection and a control method thereof.

[0005] In one aspect, a gas filling system based on automobile gas path detection is provided, which comprises:

[0006] The structural parameter acquisition module acquires length information of a passage component under an air suspension structure, records an interface position diameter, labels spatial coordinates of adjacent nodes and establishes a direction relationship, integrates passage number, length, diameter and angle information, and generates a passage structure calibration result;

[0007] The structural path construction module constructs a path diagram according to the number, angle and length parameters in the passage structure calibration result, establishes a node connection relationship and marks path attributes, and generates a detection passage path structure diagram;

[0008] The candidate path screening module calls a path set covering a brake air circuit in the detection passage path structure diagram, screens structural continuity, judges whether the connection angle and diameter change of the passage in the path meet a set standard, and arranges and generates a brake path candidate number set;

[0009] The flow state judgment module calls the brake path candidate number set, acquires path entrance flow rate sensor data, extracts a maximum fluctuation index and compares it with a set standard, identifies a path meeting air flow stability conditions, and generates a stable path number set;

[0010] The detection passage switching module calls the stable path number set matched with a detection task, screens a structure combination, selects a minimum total length path as a detection passage configuration path, and generates a detection passage configuration state;

[0011] The node control module closes a node with air leakage according to the detection passage configuration state and supplements air to a gas cylinder corresponding to a path with air leakage through an electric air compressor.

[0012] As a further scheme of the application, the passage structure calibration result includes passage number, passage length, interface diameter and node angle, the detection passage path structure diagram includes path connection relationship, path node attribute and structural screening result, the brake path candidate number set includes path number, path continuity standard, connection angle change value and interface diameter change value, the stable path number set includes path number, maximum fluctuation index and air flow stability standard, and the detection passage configuration state includes target path number, path structure combination and path total length.

[0013] As a further scheme of the application, the structural parameter acquisition module includes:

[0014] The passage identification sub-module acquires a passage component under an air suspension structure, marks passage number information, acquires the length of each passage, establishes a sequence in combination with passage connection order, and generates a passage number and length sequence according to number and length information;

[0015] The interface calibration sub-module locates a channel connection interface according to the channel number and length sequence, records a diameter parameter corresponding to the interface, analyzes a connection relationship at two ends of the interface, classifies the diameter parameter, and obtains a channel connection interface diameter parameter group;

[0016] The direction construction sub-module collects node space coordinates according to the channel connection interface diameter parameter group, labels a node connection sequence, calculates a direction relationship of adjacent nodes, integrates direction information in combination with the channel number, and generates a channel structure calibration result.

[0017] As a further scheme of the application, the structure path construction module comprises:

[0018] The path generation sub-module obtains the number, angle and length parameters in the channel structure calibration result, constructs a path node list according to a channel number sequence, establishes a node connection relationship according to the angle and length parameters between nodes, integrates a path structure according to the number sequence, and generates a channel node connection path value;

[0019] The attribute labeling sub-module extracts a node connection segment based on the channel node connection path value, judges a path type according to a connection segment length parameter and an angle parameter, labels path segment attribute information according to a judgment result, integrates path attributes in combination with the path structure, and obtains a path connection attribute set;

[0020] The relationship screening sub-module extracts a path connection relationship according to the path connection attribute set, judges whether the path satisfies a connection condition according to a connection angle value and a connection length value in the path attribute, removes the path not satisfying the condition from the structure, reorganizes a node connection path, and establishes a detection channel path structure diagram.

[0021] As a further scheme of the application, the candidate path screening module comprises:

[0022] The path extraction sub-module calls all path sets in the detection channel path structure diagram, detects a coverage area according to structure information corresponding to a path number, obtains a path number set covering a commercial vehicle brake air circuit, screens a classification to which the path belongs according to a coverage area boundary, and establishes a brake path structure number set;

[0023] The structure verification sub-module extracts a corresponding path structure based on the brake path structure number set, obtains a connection angle value and a diameter value between paths, judges a continuous structure segment in the path according to a set connection angle standard value and a diameter change standard value, and generates a structure continuous number sequence;

[0024] The path classification sub-module classifies numbers according to remaining path numbers in the structure continuous number sequence, extracts a connection relationship and a structure position parameter between different numbers, arranges a classification result according to a path number sequence, and establishes a brake path candidate number set.

[0025] As a further scheme of the present application, the flow state judgment module comprises:

[0026] The numbered calling sub-module calls all path numbers in the braking path candidate number set, collects continuous data of the flow speed sensor at the path entrance, and generates a path flow speed data sequence set;

[0027] The fluctuation extraction sub-module calculates corresponding fluctuation index values according to the flow speed change trend of the paths in the path flow speed data sequence set, sorts the fluctuation results of all paths, and obtains a path fluctuation change value set;

[0028] The stability recognition sub-module compares the fluctuation index values corresponding to the paths in the path fluctuation change value set with a set air flow stability threshold value, filters path numbers meeting the conditions, and establishes a stable path number set.

[0029] As a further scheme of the present application, the detection channel switching module comprises:

[0030] The path matching sub-module calls all path numbers in the stable path number set, matches path information of a current detection task target, extracts path items in the path numbers consistent with the target task attributes, integrates structure parameter information of the corresponding paths, and generates a target path number set;

[0031] The structure screening sub-module extracts path length information according to the structure combination parameters corresponding to each path in the target path number set, compares path total length values, identifies path items with the smallest length in the path structure combination, and obtains a minimum length path number;

[0032] The channel configuration sub-module extracts structure combination parameters according to the minimum length path number, sets path configuration content used by a current detection channel, records application of the path in a detection task, and establishes a detection channel configuration state.

[0033] As a further scheme of the present application, the air suspension structure is a component system for adjusting suspension stiffness and vehicle body height by using compressed air in a vehicle chassis, which is composed of an air bag, a pipeline, a valve body and a control unit;

[0034] The direction relationship is a geometric direction corresponding relationship between adjacent nodes in a three-dimensional space based on coordinates;

[0035] The path graph is a channel structure representation form established based on graph theory, which is constructed by taking channel nodes as graph nodes and taking air flow connection relationship as directed edges;

[0036] The connection relationship refers to a connection mode between nodes with continuity and air passing ability in the physical structure of the air path channel, which is derived from the connection process standard of the vehicle air path system.

[0037] The continuity is a structural state of smooth transition in the connection angle and diameter parameter in the channel path;

[0038] The diameter change refers to the difference in the average cross-sectional diameter between adjacent channel segments in the path, derived from the fluid pipe design specification.

[0039] As a further scheme of the present application, the maximum fluctuation index is the maximum change value in the flow rate gradient sequence appearing within the sampling time window, derived from the gas flow detection standard;

[0040] The configuration path is the channel path number and corresponding structure information selected by the system when performing the detection task, derived from the path management mechanism of the automobile gas path detection system.

[0041] On the other hand, an automobile gas path detection control method is executed based on the above-mentioned automobile gas path detection-based inflation system, comprising the following steps:

[0042] S1: Obtain the gas path channel component information under the air suspension structure, extract the channel segment number, length and connection interface diameter, label the spatial coordinates of the channel nodes, calculate the direction angle according to the spatial position relationship between the nodes, integrate the above-mentioned parameter items for archiving, and generate the channel structure calibration result;

[0043] S2: Call the channel number, angle and length parameters in the channel structure calibration result, establish the connection structure between the nodes, filter out the path relationships that do not meet the connection conditions, establish the path graph structure in the remaining connections, and generate the detection channel path structure graph;

[0044] S3: Call the path set in the detection channel path structure graph, screen the continuity of channel connection in the path, judge whether the parameter changes of angle and diameter are within the set standard range, classify and organize the path numbers that meet the conditions, and generate the brake path candidate number set;

[0045] S4: Call all path numbers in the brake path candidate number set, collect flow rate sensor data at the path entrance, analyze the flow rate change sequence of the channel segments in the path, extract the maximum fluctuation index of the flow rate change in the path, and discriminate according to the stability standard, and generate the stable path number set;

[0046] S5: Call the path number in the stable path number set, filter the path structure matching the current detection task, select the shortest path number according to the total length parameter, and generate the detection channel configuration state.

[0047] The technical scheme provided by the embodiment of the present application has at least the following beneficial effects:

[0048] By collecting parameters such as channel length, diameter and node space coordinates in the gas circuit, a path structure with direction and connection relationship is constructed, the precision modeling capability for complex gas circuits is improved, unreasonable connection paths are excluded by taking angle connection and diameter matching as screening standards, the screening accuracy of detection paths is optimized, the accuracy of path judgment is improved from a dynamic level by analyzing the gas flow stability combined with the flow velocity fluctuation index, the shortest path in total length is preferred when configuring the detection channel, the response delay and energy consumption are reduced, and multi-dimensional processing from structure identification to flow state analysis is realized as a whole, and the leakage detection efficiency and reliability in the complex commercial vehicle gas circuit environment are enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0050] Figure 1 is a system flowchart of the present application;

[0051] Figure 2 is a system framework schematic diagram of the present application;

[0052] Figure 3 is a flowchart of the structure parameter acquisition module in the present application;

[0053] Figure 4 is a flowchart of the structure path construction module in the present application;

[0054] Figure 5 is a flowchart of the candidate path screening module in the present application;

[0055] Figure 6 is a flowchart of the flow state judgment module in the present application;

[0056] Figure 7 is a flowchart of the detection channel switching module in the present application;

[0057] Figure 8 is a flowchart of an automobile gas circuit detection control method provided by an embodiment of the present application. DETAILED DESCRIPTION

[0058] The technical solutions in the present application will be described below in combination with the drawings.

[0059] In the embodiments of the present application, the words such as "example", "for example" are used to represent an example, illustration, or description. Any embodiment or design scheme described as "example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the word "example" is intended to present the concept in a specific manner. In addition, in the embodiments of the present application, the meaning expressed by "and / or" can be both, or can be one of the two.

[0060] In the embodiments of the present application, "image" and "picture" can be used interchangeably at times, and it should be pointed out that the meanings expressed are consistent when the distinction is not emphasized. "Of", "corresponding" and "corresponding" can be used interchangeably at times, and it should be pointed out that the meanings expressed are consistent when the distinction is not emphasized.

[0061] In the embodiments of the present application, sometimes the subscript such as W1 can be written in the form of non-subscript such as W1, and the meanings expressed are consistent when the distinction is not emphasized.

[0062] In order to make the technical problems, technical schemes and advantages to be solved by the present application more clear, the following will be described in detail in combination with the drawings and specific embodiments.

[0063] The embodiments of the present application provide a pumping system based on automobile air path detection, such as Figures 1-2 A pumping system based on automobile air path detection, as shown in a pumping system based on automobile air path detection schematic diagram, the pumping system comprises:

[0064] The structure parameter acquisition module acquires the channel component under the air suspension structure in the automobile air path detection system, collects the length information of each channel, records the diameter parameter of the channel connection interface position, labels the spatial coordinates of adjacent nodes and establishes the direction relationship, integrates the number, length, diameter and angle information of the channel, and generates the channel structure calibration result;

[0065] The air suspension structure is a component system in the vehicle chassis for adjusting the suspension stiffness and the body height by using compressed air, which is composed of air bags, pipelines, valve bodies and control units, is a typical air flow channel component in the automobile air path detection system, and comes from the vehicle chassis suspension system technical field;

[0066] The direction relationship is a geometric orientation corresponding relationship between adjacent nodes in three-dimensional space based on coordinates, and is used to represent the connection direction and angle source of the channel in space;

[0067] The structural path construction module constructs a path structure of the exhaust passage according to the number, angle and length parameters of the passages in the passage structure calibration result, establishes a connection relationship between nodes and marks path attributes, filters out path relationships that do not meet the connection conditions in the structure, and generates a detection passage path structure diagram;

[0068] The path structure is a passage structure representation form established based on graph theory, constructed by taking passage nodes as graph nodes and taking airflow connection relationships as directed edges, and is used to describe path topological characteristics of the exhaust passage, and is derived from the field of fluid network modeling;

[0069] The connection relationship refers to a connection mode between nodes that have continuity and air passage capacity in the physical structure of the air route, and is derived from the connection process standard of the air route system of the vehicle;

[0070] The candidate path screening module calls a path set covering the brake air route of the commercial vehicle in the detection passage path structure diagram, screens the continuity of the path structure, judges whether the connection angle and diameter change between passages in each path meet the set standard, classifies the path numbers that meet the requirements, and generates a brake path candidate number set;

[0071] The continuity is a structure state in which the connection angle and diameter parameters of the passage path are smoothly transitioned, and is used to determine the stability of the candidate path in the structure parameters;

[0072] The diameter change refers to the difference in the average cross-sectional diameter between adjacent passage segments in the path, and is used to judge whether there is a mutation in the structure of the airflow passage, and is derived from the fluid pipe design specification;

[0073] The flow state judgment module calls all path numbers in the brake path candidate number set, starts the flow rate sensor at the path entrance to collect data, analyzes the difference change of the obtained flow rate sequence, extracts the maximum fluctuation index of each path, compares it with the set standard value, identifies the path number that meets the airflow stability condition, and generates a stable path number set;

[0074] The difference change analysis is a first-order difference processing method performed on the flow rate sampling sequence, and is used to extract the change trend of the airflow at the passage entrance, and is derived from the field of fluid mechanics signal processing;

[0075] The maximum fluctuation index is the maximum change value in the flow rate gradient sequence within a sampling time window, and is used to represent the stability characteristics of the passage airflow, and is derived from the gas flow detection standard;

[0076] The detection passage switching module calls the path number that matches the target of the current detection task in the path number set, performs length screening on the path structure that meets the condition, selects a path with the smallest total length in the structure combination as the configuration path of the detection passage, and generates a detection passage configuration state;

[0077] The node control module closes the node with air leakage according to the detection channel configuration state and supplements air to the gas cylinder corresponding to the path with air leakage through the electric air compressor.

[0078] The detection task target is the number of the corresponding air flow node or detection area in the air path detection system, used to identify the position pointed to by the current detection task, and is derived from the task definition system of the automobile detection station and the control unit;

[0079] The configuration path is the channel path number and corresponding structure information selected by the system when performing the detection task, used to guide the channel switching and path use of the detection process, and is derived from the path management mechanism of the automobile air path detection system.

[0080] The channel structure calibration result includes channel number, channel length, interface diameter, node angle, the detection channel path structure diagram includes path connection relationship, path node attribute, structure screening result, the brake path candidate number set includes path number, path continuity standard, connection angle change value, interface diameter change value, the stable path number set includes path number, maximum fluctuation index, air flow stability standard, and the detection channel configuration state includes target path number, path structure combination, and path total length.

[0081] Specifically, as shown in Figure 2 , 3 The structure parameter acquisition module includes:

[0082] The channel identification submodule acquires the channel components under the air suspension structure, marks the number information of the channel, acquires the length of each channel, establishes a sequence in combination with the channel connection order, and generates a channel number and length sequence according to the number and length information;

[0083] When extracting the channel components under the air suspension structure, it is necessary to rely on the structural design drawing and three-dimensional modeling data. First, the components with tubular features are selected as target objects through recognition algorithm, such as components with regular circular cross-section, continuous path and wall thickness of 2 to 4 mm. After confirmation, they are numbered respectively, such as T001, T002, T003, etc. The different channel paths are distinguished by the numbers. Then the length of each channel is measured. The laser ranging equipment is used to collect data along the path from the starting point to the ending point of the component. For example, the full length of T001 is 1275 mm, the full length of T002 is 980 mm, and the full length of T003 is 1450 mm. The measurement results are recorded under the corresponding number. Then the connection order between channels is determined by combining with the engineering layout, such as T001 connected to T002, T002 connected to T003, and so on. According to this order, the connection chain is formed. Combined with the above information, the complete channel number and length sequence is generated, such as T001-1275 mm, T002-980 mm, T003-1450 mm. This sequence is used as the basic data for subsequent space connection and structure judgment.

[0084] The interface calibration sub-module locates the channel connection interface according to the channel number and length sequence, records the diameter parameters corresponding to the interface, analyzes the connection relationship of the two ends of the interface, and classifies the diameter parameters to obtain the diameter parameter group of the channel connection interface;

[0085] According to the generated channel number and length sequence, the interface of each component is determined by identifying the connection position between channels, for example, the connection point between T001 and T002 is set as interface I01. Combined with the three-dimensional model and structural connection information, the spatial nodes at the connection positions of adjacent channels are located, and the physical parameters of the interface are measured by using an endoscope or a laser ranging device, for example, the outer diameter of interface I01 is 25 mm and the inner diameter is 22 mm. The group of data is recorded as the physical parameters of the interface. Further analysis of the material and structural differences of the two ends of the interface is made to determine whether there is an adapter, expansion section or contraction section structure, such as T001 being an aluminum alloy pipe and T002 being a rubber hose, which is classified as a heterogeneous connection. According to the difference between the outer diameters of the two ends of the interface, three intervals are set for classification, if the difference is within 0 to 2 mm, it is determined as a same diameter interface; if the difference is between 2 to 10 mm, it is classified as a small amplitude expansion or contraction; when the difference exceeds 10 mm, it is defined as a significant difference interface. Taking I01 as an example, the outer diameter of T001 is 25 mm and the outer diameter of T002 is 22 mm, the difference is 3 mm, which meets the definition of small amplitude contraction. The information of all interfaces, such as number, corresponding channel number, structure type, diameter parameter, etc. is sorted out to form a structure interface diameter data set for subsequent modeling and direction positioning.

[0086] The direction construction submodule collects the spatial coordinates of the nodes according to the channel connection interface diameter parameter group, labels the node connection order, calculates the direction relationship of adjacent nodes, integrates the direction information combined with the channel number, and generates the channel structure calibration result;

[0087] According to the established interface diameter data, the actual coordinate positions of all interfaces in space are collected, and high-precision laser measuring devices are used to obtain the three-dimensional coordinate values of each interface, such as interface I01 located at 125.3X, 48.7Y, 230.5Z, and interface I02 located at 145.3X, 58.7Y, 260.0Z. Label the node number connected by each interface and its connection order, for example, node N01 is connected to N02, and the corresponding channel is T001. Based on each pair of adjacent nodes, sequentially calculate the coordinate difference value, and record the spatial change value axis by axis, such as N01 to N02 increases by 20 in X direction, 10 in Y direction, and 29.5 in Z direction. Integrate these changes to reflect the direction trend between nodes. Organize all direction information according to the connection relationship, and integrate it into a sequence combined with the channel number, such as T001 direction corresponds to N01-N02, and T002 direction is N02-N03. Integrate the channel number, node number, and spatial direction value to form a complete direction information sequence as the basic data for structure direction calibration.

[0088] Specifically, as shown in Figure 2 , 4 The structure path construction module includes:

[0089] The path generation submodule obtains the number, angle, and length parameters in the channel structure calibration result, constructs a path node list according to the channel number sequence, establishes node connection relationships according to the angle and length parameters between nodes, integrates the path structure according to the number sequence, and generates the channel node connection path value;

[0090] After obtaining the channel number, angle, and length parameters from the channel structure calibration results, the channels are first extracted according to their numbering order. For example, channels numbered T001, T002, and T003 are arranged sequentially. Then, a node numbering list is created according to the numbering order. For example, if T001 connects to N001 as the starting point and N002 as the ending point, then T002 connects to N002 to N003, and T003 connects to N003 to N004. After each segment number is determined, its corresponding angle and length are recorded one by one. For example, T001 has an angle of 35 degrees and a length of 1245, T002 has an angle of 40 degrees and a length of 980, and T003 has an angle of 20 degrees and a length of 875. Based on the adjacency relationship and numbering order between nodes, a complete path node linked list is constructed. Subsequently, in each To establish a connection between two nodes, the connection relationship needs to be determined by a combination of angle and length parameters. If the angle is between 0 and 30 degrees and the length exceeds 1000, the segment can be marked as a long straight segment. If the angle is greater than 45 degrees and the length is less than 800, it can be determined as a short segment with a sharp turn. By dividing the spatial relationship between each node in the channel in this way, a path connection record with path number, start and end nodes, angle value, and length value is constructed. All records are arranged in the order of channel number to form a path structure set. In the channel layout, for example, T001 is N001 to N002 with an angle of 35 degrees and a length of 1245, and T002 is N002 to N003 with an angle of 40 degrees and a length of 980. This kind of path connection information is integrated into the channel node connection path value.

[0091] The attribute annotation submodule extracts node connection segments based on the channel node connection path value, determines the path type based on the connection segment length and angle parameters, annotates the path segment attribute information according to the judgment result, and integrates the path attributes with the path structure to obtain the path connection attribute set.

[0092] After extracting the path connection value of the channel node, the path segments need to be traversed in turn to extract the start point, end point, connection angle and segment length information in the path, such as T001 from N001 to N002, the angle is 35 degrees, the length is 1245, T002 from N002 to N003, the angle is 60 degrees, the length is 980, and then these data are used to judge the type of the path segment, and the judgment process adopts the segmented interval matching method, the angle value is divided into three levels, 0-15 degrees for straight line segment, 15-45 degrees for slow change segment, and more than 45 degrees for sharp turn segment, the length is divided into three grades, less than 600 for short segment, 600-1200 for medium segment, and more than 1200 for long segment, if the angle of a certain path segment is 10 degrees and the length is 1320, it is classified as a straight long segment, if the angle is 50 degrees and the length is 780, it is classified as a sharp turn medium segment, such judgment method is completed through the bidirectional matching of angle and length, the basic angle limit is set as 15 degrees and 45 degrees, the basic length limit is set as 600 and 1200, the attribute category of each path segment is marked, the coding method can set the angle attribute such as A1 for straight line segment, A2 for slow change segment, A3 for sharp turn segment, the length attribute such as L1 for short segment, L2 for medium segment, L3 for long segment, for example, the angle of T001 is 35 degrees and the length is 1245, the attribute of this segment is A2L3, i.e. slow change long segment, the attributes of all path segments are integrated into the path attribute set according to their number sequence, such as T001 is A2L3, T002 is A3L2, and T003 is A1L2, this set contains path number, start and end nodes, angle and length classification code, which is the basic information for path structure analysis.

[0093] The relationship screening submodule extracts the path connection relationship according to the path connection attribute set, judges whether the path meets the connection condition according to the connection angle value and the connection length value in the path attribute, removes the path that does not meet the condition from the structure, reorganizes the connection path between nodes, and establishes a detection channel path structure diagram;

[0094] After extracting the path connection relationship according to the path connection attribute set, it is necessary to determine whether the path segments meet the conditions for continued connection, extract the angle and length parameters of adjacent path segments, for example, the angle of T001 is 35 degrees, the angle of T002 is 60 degrees, the angle difference is 25 degrees, the length of T002 is 450, and the set judgment standard is that the angle difference is not greater than 20 degrees and the length of the connected segment is not less than 500, so that the connection can be continued. In this scenario, the angle difference exceeds the standard and the length is also lower than the limited value, so the T002 segment is determined not to meet the connection condition and is removed from the path structure. Then the remaining path segments are adjusted in structure, the connection relationship between the nodes is reorganized, the path order is ensured to be continuous and uninterrupted, and the path relationship graph is reconstructed. The start and end nodes in each reserved path segment are numbered and connected in order to form a structural graph. Each edge represents a path segment that meets the connection condition, and each point represents a channel node. For example, if T001 connects N001 to N002 and is reserved, T003 connects N003 to N004 and is reserved, but T002 is removed, then the path graph is N001-N002 disconnected and directly connected to N003-N004. If there is a connection relationship between the two, the adjacent angle and distance supplement information will be matched again to reconstruct the structure graph for structure tracking and checking.

[0095] Specifically, as shown in Figure 2 、 5 , the candidate path screening module includes:

[0096] The path extraction submodule calls all path sets in the detection channel path structure graph, detects the coverage area according to the structure information corresponding to the path number, obtains the path number set covering the commercial vehicle brake air circuit, screens the classification to which the path belongs according to the coverage area boundary, and establishes the brake path structure number set;

[0097] After calling all path sets in the structure diagram of the detection channel path, the path information needs to be extracted one by one according to the number, and the corresponding starting point, end point node, path length, connection angle and arrangement area are obtained. Through the correspondence between the path number and the node coordinates in the structure diagram, it is judged that the path P001 is connected by nodes N101 to N102, the starting point coordinates are 120, 220, and the end point coordinates are 460, 620. The range of the area covered by the path can be determined by constructing a boundary rectangle with the node coordinates. The path boundary is X direction 120 to 460, Y direction 220 to 620. Then, the standard boundary of the commercial vehicle brake air path covered area is compared and analyzed (for example, the boundary range is set to X axis 100 to 500, Y axis 200 to 700). Since the path boundary is completely contained in the covered area, it is determined that it is in the range of the brake air path, and the path number is included in the preliminary screening set. After traversing all path sets to perform this judgment operation, all path numbers that meet the position condition are obtained. Then, the classification information is extracted through the association of these numbers with the path database. The classification basis can include main air path, branch pipe, feedback path and other types. If the classification field identifier is related to the brake system, it is retained, otherwise it is excluded. For example, P001 is the main air path, P002 is the signal feedback channel, and P003 is the air conditioning air path. Therefore, P001 and P002 are retained and P003 is excluded. The integrated brake path structure number set containing path number, position coordinates and classification is formed.

[0098] The structure verification submodule extracts the corresponding path structure based on the brake path structure number set, obtains the connection angle value and diameter value between the paths, and judges the continuous structure segments in the path according to the set connection angle standard value and diameter change standard value. The path number that does not meet the standard of structure continuity is excluded, and the structure continuous number sequence is generated.

[0099] The structure checking operation takes the brake path structure number set as the input data source, sequentially extracts the path structure detail information according to the number, obtains the connection angle and pipe diameter data of adjacent channel segments in each path, for example, the path P011 contains three connected structures, the node sequence is M01 to M04, the connection segments are M01-M02, M02-M03, and M03-M04, the angles are 28 degrees, 30 degrees, and 42 degrees respectively, and the diameters are 13, 13, and 11. The continuity judgment is performed on these data, the allowable upper limit of the connection angle is set to 35 degrees, and the maximum difference of adjacent diameters is not more than 2. In the judgment, whether the angle between each two connection segments is within the standard range is calculated in sequence. If the angle value is within 35 degrees, it is a qualified segment, otherwise it is a discontinuous segment. Then, the difference value of the adjacent segment diameters is judged, for example, the diameters of M02-M03 and M03-M04 are 13 and 11 respectively, and the difference is 2, which meets the maximum change standard. If the connection angle of a segment is 38 degrees or the diameter change is 3, it does not meet the standard requirement, and the whole path will be marked as discontinuous number and excluded. The continuity judgment needs to cover the whole path, only the path numbers that meet the conditions are reserved, and a structure continuous number sequence composed of qualified numbers is constructed, which is used for path classification in the next stage.

[0100] The path classification submodule classifies the remaining path numbers in the structure continuous number sequence, extracts the connection relationship and structure position parameters between different numbers, arranges the classification results according to the path number sequence, and establishes a brake path candidate number set;

[0101] The path classification processing is based on the structure continuous number sequence, and the remaining path numbers are clustered and classified according to their logical structure positions. First, the path numbers are arranged in ascending order, and the end point and start point node information, node coordinates, and functional area label of each path are extracted according to the number. The connection relationship between paths is judged by analyzing whether there are common nodes or continuous connection nodes, for example, the end point of number P021 is N305, and the start point of number P022 is also N305, which is considered as a direct connection relationship. If the end point of P023 is N308 and it is indirectly connected with P024 through N309, it is also considered as a connection relationship. When classifying, the connection strength standard is defined. Direct connection is considered as complete matching, and indirect connection needs to meet the distance between nodes less than 100 and the connection direction consistent to be classified into the same path set. The structure position parameters include the system area where each path is located, such as front axle, rear axle, main gas path, branch channel, etc. Combined with the connection relationship and structure position judgment, the numbers are classified into corresponding path groups, for example, P021, P022, and P025 are located in the front axle area of the main gas path and have direct or close indirect connection relationship, and are classified into the same group. A plurality of number group sets are generated, which are arranged and summarized according to the path number sequence, and are named as brake path candidate number set. The subsequent structure processing will be carried out based on this set.

[0102] Specifically, as shown in Figure 2 , 6 , the flow state judgment module includes:

[0103] The number calling sub-module calls all path numbers in the braking path candidate number set, collects continuous data of the flow rate sensor at the path entrance, removes abnormal records, and performs time sequence arrangement to generate a path flow rate data sequence set;

[0104] After calling all path numbers in the braking path candidate number set, the starting entrance of each path is sequentially accessed, the continuous flow rate data recorded by the airflow flow rate sensor installed at the entrance is called, the data sampling frequency is set to one per second, the original data is formed into a record sequence in the order of time stamp, and then an abnormal record removal operation needs to be performed. The abnormal identification standard is based on the upper and lower limit range set, and the limit is based on the average value of the data sequence floating up and down, for example, the average flow rate of a certain path number within 30 seconds is 22 m / s, the floating range is set to ± 15%, the upper limit is 25.3 m / s, and the lower limit is 18.7 m / s. If a data point with a flow rate value of 27 m / s or 17 m / s appears in the record, it is considered abnormal and removed. After the removal is completed, the remaining valid data is rearranged in chronological order to form a continuous flow rate sequence. For the missing records appearing therein, linear interpolation method is used to fill in, for example, the records of a certain path at 8th and 10th seconds are 21 m / s and 23 m / s respectively, and the 9th second interpolation can be set to 22 m / s. Each path completes the collection, abnormal removal and time sequence construction of the flow rate data according to the above process, and forms a flow rate data sequence set containing all path numbers and corresponding continuous flow rate records.

[0105] The fluctuation extraction sub-module calculates the corresponding fluctuation index value according to the flow rate change trend of the path in the path flow rate data sequence set, arranges the fluctuation results of all paths, and obtains a path fluctuation change value set;

[0106] After acquiring the flow velocity data sequence, the corresponding time series flow velocity data is extracted one by one according to the path number. The data is analyzed for trend changes and the fluctuation index value is calculated. The fluctuation index can be defined as the change range of flow velocity within a period of time. For example, if the length of each time segment is set to 10 seconds, the flow velocity of path number P015 is recorded between 22 and 25 m / s from the 1st to the 10th second, with a fluctuation range of 3 m / s. The analysis continues from the 11th to the 20th second, the 21st to the 30th second, and so on, to obtain the fluctuation values ​​of multiple time segments. The overall fluctuation performance of the path within the measured time is then summarized. If the fluctuation range of each time segment is less than 4 m / s, the fluctuation value is considered to be at a stable level. If the flow velocity jumps from 20 m / s to 28 m / s in a certain segment, with a fluctuation range of 8 m / s, it is recorded as a violent fluctuation. The processing method is carried out in sequence according to the path number. The fluctuation range values ​​of all paths are uniformly organized to form a set of fluctuation change values. The fluctuation characteristics of each path are collected and prepared as the basic data source for subsequent stability determination.

[0107] The stability identification submodule compares the fluctuation index value corresponding to the path in the path fluctuation change value set with the set airflow stability threshold, filters out the path numbers that meet the conditions, and establishes a stable path number set.

[0108] After obtaining the fluctuation values ​​of all paths, the fluctuation index of each path is judged and compared with the set stability threshold. The stability standard is defined as a fluctuation amplitude not exceeding 5 m / s. If the fluctuation amplitude of a path number is less than or equal to 5 m / s in all time periods, the airflow is considered stable. If the fluctuation amplitude exceeds this threshold in any time period, such as the record showing a sudden increase in flow velocity from 19 m / s to 28 m / s, with a fluctuation amplitude of 9 m / s, the path is judged as unstable. To clarify the classification standard, the fluctuation amplitude range is divided into 0 to 2 m / s as highly stable, 2 to 5 m / s as moderately stable, 5 to 8 m / s as slightly unstable, and more than 8 m / s as severely unstable. Only the first two types of path numbers are included in the stable path number set. The judgment of each number is performed by comparing its fluctuation value with the threshold item by item, and the stable path number set is obtained and the corresponding fluctuation information is recorded.

[0109] Specifically, such as Figure 2 , 7 As shown, the detection channel switching module includes:

[0110] The path matching submodule calls all path numbers in the stable path number set, matches the path information of the current detection task target, extracts the path items in the path numbers that are consistent with the target task attributes, integrates the structural parameter information of the corresponding paths, and generates a target path number set.

[0111] After all path numbers in the stable path number set are called, the task attribute information contained in each path is read one by one in the order of path number, and the task attribute content covers path applicable scene, structure form, connection mode, use material and pressure level, etc., and the required target attributes are extracted from the current detection task, including target component category, pressure requirement, medium characteristics, response sensitivity level, etc., the attribute label of each path is matched with the task target attribute, and the matching method is attribute item comparison method, if the consistent item in the attribute item of a path accounts for more than 80% of the task attribute, it is determined as matching success, for example, the target task attribute is low pressure, short distance, flexible connection, the path number A103 label attribute is low pressure, medium distance, rigid connection, only one item matches, accounting for 33%, which does not meet the requirement, while the path number B207 has three items of low pressure, short distance and flexible connection, the matching degree is 100%, which meets the screening standard, the matching degree is calculated based on the ratio of the number of consistent attribute items to the total number of items, after each path is matched successfully, its number is extracted, and the structure parameter information associated with the number is merged and arranged, including path total length, structure composition of each section, material category, interface mode, bending number, etc., the information of all matched paths is collected to form a target path number set.

[0112] The structure screening submodule extracts path length information according to the structure combination parameters corresponding to each path in the target path number set, compares the path total length value, identifies the path item with the smallest length in the path structure combination, and obtains the minimum length path number;

[0113] The structure combination parameters corresponding to each path in the target path number set are extracted, and the physical length information of the path is focused on. The path total length is the sum of the lengths of each straight section, bending section and connecting piece. In the extraction process, the length value is calculated based on the path section number and the length data of each section. For example, path number C102 is composed of three sections, namely rigid pipe 2.0m, flexible connection section 0.9m and elbow section 0.6m. The path total length is 2.0m plus 0.9m plus 0.6m, which equals 3.5m. In this way, all target path numbers are traversed and their length values are recorded. Then all path lengths are compared to identify the path number with the smallest length. If path number D118 has a length of 3.1m, E203 has a length of 3.9m, and F001 has a length of 3.1m, it is considered that there are multiple shortest path numbers. At this time, auxiliary screening standards such as the number of turns or the complexity of the interface are introduced, and the path number with fewer turns or more standard interface is selected as the result, so as to ensure that only one shortest path number is reserved for subsequent configuration task calling.

[0114] The channel configuration submodule extracts the structure combination parameters according to the minimum length path number, sets the path configuration content used by the current detection channel, records the application of the path in the detection task, and establishes the detection channel configuration state.

[0115] According to the minimum length path numbering to extract the structural combination parameters of the path, the parameter content includes path composition paragraphs, material types, connection methods, interface specifications and other information, and the configuration content required for setting the detection channel is set according to the structural parameters. The configuration process is laid out according to the path structure. The setting content includes the connection identification of the path entrance and exit ports, the function definition of each paragraph, the installation position of the control components and the corresponding area of the detection elements. If the path number G305 contains two rigid straight pipe sections and one flexible connection section, the total length is 2.8m, then during the configuration, fixed clamps are set at both ends of the flexible section, a temperature sensor is installed on the first straight pipe, and a gas discharge valve is set at the end. If the path interface type is a quick plug connector, a corresponding connector conversion device needs to be used on the detection equipment. After the configuration is completed, the configuration state of the detection channel needs to be recorded. The recording content includes the configuration number, the corresponding path number, the structural parameter details, the task number and the detection time information. All the content forms the detection channel configuration state data set.

[0116] Please refer to Figure 8 , the automobile air path detection control method based on the above-mentioned automobile air path detection inflation system, comprising the following steps:

[0117] S1: Obtain the air path component information under the air suspension structure, extract the channel section number, length and connection interface diameter, mark the spatial coordinates of the channel nodes, calculate the direction angle according to the spatial position relationship between the nodes, integrate the above parameter items for archiving, and generate the channel structure calibration result;

[0118] S2: Call the channel number, angle and length parameters in the channel structure calibration result, establish the connection structure between the nodes, screen out the path relationships that do not meet the connection conditions, and establish the path structure graph in the remaining connections to generate the detection channel path structure graph;

[0119] S3: Call the path set in the detection channel path structure graph, screen the continuity of the channel connection in the path, judge whether the parameter changes of the angle and diameter are within the set standard range, classify and organize the path numbers that meet the conditions, and generate the brake path candidate number set;

[0120] S4: Call all path numbers in the brake path candidate number set, collect the flow rate sensor data at the path entrance, analyze the flow rate change sequence of the path channel section, extract the maximum fluctuation index of the flow rate change in the path, and judge according to the stability standard to generate the stable path number set;

[0121] S5: Call the path number in the stable path number set, screen the path structure that matches the current detection task, select the shortest path number according to the total length parameter of the path, and generate the detection channel configuration state.

[0122] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A tire inflation system based on automotive air circuit detection, characterized in that, The air pumping system includes: The structural parameter acquisition module collects the length information of the channel components under the air suspension structure, records the diameter of the interface position, marks the spatial coordinates of adjacent nodes and establishes the directional relationship, integrates the channel number, length, diameter and angle information, and generates the channel structure calibration results; The structural path construction module constructs a path diagram based on the number, angle, and length parameters in the channel structure calibration results, establishes node connection relationships, marks path attributes, and generates a detection channel path structure diagram. The candidate path screening module calls the set of paths covering the brake air circuit in the detection channel path structure diagram, screens the structural continuity, judges whether the connection angle and diameter change of the channel in the path meet the set standard, and organizes and generates a set of brake path candidate numbers. The flow state judgment module calls the braking path candidate number set, collects the path inlet flow velocity sensor data, extracts the maximum fluctuation index and compares it with the set standard, identifies the path that meets the airflow stability conditions, and generates a stable path number set; The detection channel switching module calls the set of stable path numbers that match the detection task, filters the structural combinations, selects the path with the minimum total length as the detection channel configuration path, and generates the detection channel configuration status. The node control module shuts down nodes with leaks based on the configuration status of the detection channels and replenishes air to the air storage tanks corresponding to the leaking paths using an electric air compressor. The structural parameter acquisition module includes: The channel identification submodule acquires the channel components under the air suspension structure, marks the channel number information, collects the length of each channel segment, establishes a sequence based on the channel connection order, and generates a channel number and length sequence based on the number and length information. The interface calibration submodule locates the channel connection interface according to the channel number and length sequence, records the diameter parameter corresponding to the interface, analyzes the connection relationship at both ends of the interface, classifies the diameter parameter, and obtains the channel connection interface diameter parameter group. The orientation construction submodule collects the spatial coordinates of nodes based on the diameter parameter group of the channel connection interface, marks the node connection order, calculates the orientation relationship between adjacent nodes, integrates the orientation information with the channel number, and generates the channel structure calibration result.

2. The air inflation system based on automotive air circuit detection according to claim 1, characterized in that, The channel structure calibration results include channel number, channel length, interface diameter, and node angle. The detection channel path structure diagram includes path connection relationship, path node attributes, and structure elimination results. The braking path candidate number set includes path number, path continuity standard, connection angle change value, and interface diameter change value. The stable path number set includes path number, maximum fluctuation index, and airflow stability standard. The detection channel configuration status includes target path number, path structure combination, and total path length.

3. The air inflation system based on automotive air circuit detection according to claim 1, characterized in that, The structural path construction module includes: The path generation submodule obtains the number, angle, and length parameters from the channel structure calibration results, constructs a path node list according to the channel number order, establishes node connection relationships based on the angle and length parameters between nodes, integrates the path structure according to the number order, and generates channel node connection path values. The attribute annotation submodule extracts node connection segments based on the channel node connection path values, determines the path type based on the connection segment length and angle parameters, annotates the path segment attribute information according to the judgment results, and integrates the path attributes in combination with the path structure to obtain the path connection attribute set. The relationship filtering submodule extracts path connection relationships based on the path connection attribute set, determines whether the path meets the connection conditions based on the connection angle value and connection length value in the path attributes, removes paths that do not meet the conditions from the structure, reorganizes the connection paths between nodes, and establishes a detection channel path structure diagram.

4. The air inflation system based on automotive air circuit detection according to claim 3, characterized in that, The candidate path filtering module includes: The path extraction submodule calls all path sets in the detection channel path structure diagram, detects the coverage area based on the structure information corresponding to the path number, obtains the path number set covering the commercial vehicle brake air circuit, screens the path to its category based on the coverage area boundary, and establishes a brake path structure number set. The structural verification submodule extracts the corresponding path structure based on the braking path structure number set, obtains the connection angle value and diameter value between channels in the path, judges the continuous structural segments in the path according to the set connection angle standard value and diameter change standard value, and generates a continuous structural number sequence. The path classification submodule classifies the remaining path numbers in the continuous numbering sequence of the structure, extracts the connection relationship and structural position parameters between the different numbers, arranges the classification results according to the path number order, and establishes a set of candidate numbers for braking paths.

5. The air inflation system based on automotive air circuit detection according to claim 4, characterized in that, The flow state determination module includes: The numbering call submodule calls all path numbers in the braking path candidate number set, collects continuous data from the flow velocity sensor at the path inlet, and generates a path flow velocity data sequence set; The fluctuation extraction submodule calculates the corresponding fluctuation index value based on the flow velocity change trend of the path in the path flow velocity data sequence set, organizes the fluctuation results of all paths, and obtains a set of path fluctuation change values. The stability identification submodule compares the fluctuation index value corresponding to the path in the path fluctuation change value set with the set airflow stability threshold, filters out the path numbers that meet the conditions, and establishes a stable path number set.

6. The air inflation system based on automotive air circuit detection according to claim 5, characterized in that, The detection channel switching module includes: The path matching submodule calls all path numbers in the stable path number set, matches the path information of the current detection task target, extracts the path items in the path numbers that are consistent with the target task attributes, integrates the structural parameter information of the corresponding paths, and generates a target path number set. The structure filtering submodule extracts path length information based on the structure combination parameters corresponding to each path in the target path number set, compares the total path length value, identifies the path item with the smallest length in the path structure combination, and obtains the path number with the smallest length. The channel configuration submodule extracts the structural combination parameters based on the minimum length path number, sets the path configuration content used by the current detection channel, records the application of the path in the detection task, and establishes the detection channel configuration status.

7. The air inflation system based on automotive air circuit detection according to claim 1, characterized in that, The air suspension structure is a component system in the vehicle chassis that uses compressed air to adjust the suspension stiffness and vehicle height, consisting of airbags, pipes, valve bodies and control units; The directional relationship is the geometric orientation correspondence between adjacent nodes in three-dimensional space based on coordinates; The path graph is a channel structure representation based on graph theory, constructed with channel nodes as graph nodes and airflow connection relationships as directed edges; The connection relationship refers to the connection method between nodes that have continuity and ventilation capacity in the physical structure of the air passage, which is derived from the vehicle air passage system connection process standard; The continuity refers to the structural state in which the connection angle and diameter parameters are smoothly transitioned in the channel path; The diameter variation refers to the difference in average cross-sectional diameter between adjacent channel segments in the path, which is derived from fluid pipeline design specifications.

8. The air inflation system based on automotive air circuit detection according to claim 1, characterized in that, The maximum fluctuation index is the maximum change value that occurs in the velocity gradient sequence within the sampling time window, which is derived from the gas flow detection standard; The configuration path is the channel path number and corresponding structural information selected by the system when performing the detection task, which comes from the path management mechanism of the automotive air circuit detection system.

9. A method for detecting and controlling the air circuit of an automobile, characterized in that, The inflation system based on automotive air circuit detection according to any one of claims 1-8 includes the following steps: S1: Obtain information on the air passage components under the air suspension structure, extract the channel segment number, length and connection interface diameter, mark the spatial coordinates of the channel nodes, calculate the direction angle based on the spatial positional relationship between the nodes, integrate the above parameters for archiving, and generate the channel structure calibration results. S2: Call the channel number, angle and length parameters in the channel structure calibration result to establish the connection structure between nodes, filter out path relationships that do not meet the connection conditions, establish a path graph structure in the remaining connections, and generate a detection channel path structure graph; S3: Call the path set in the detection channel path structure diagram, screen the continuity of channel connections in the path, determine whether the parameter changes of angle and diameter are within the set standard range, classify and organize the path numbers that meet the conditions, and generate a set of candidate braking path numbers. S4: Call all path numbers in the candidate braking path number set, collect flow velocity sensor data at the path inlet, analyze the flow velocity change sequence of the channel segment in the path, extract the maximum fluctuation index of flow velocity change in the path, and judge according to the stability standard to generate a stable path number set. S5: Call the path numbers in the stable path number set, filter the path structure that matches the current detection task, select the shortest path number based on the total path length parameter, and generate the detection channel configuration status.

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