Air tightness detection method and device, vehicle and computer program product

Abstract

The invention relates to an air tightness detection method and device, a vehicle and a computer program product, and the method comprises the steps: when the vehicle is in a parking state, if the current air pressures of a first brake loop, a second brake loop and a third brake loop of an air brake system of the vehicle are all greater than or equal to starting air pressure; if yes, first air pressure of the first to third brake circuits is detected after a first preset duration, and a first air pressure difference of the first to third brake circuits is obtained based on the first air pressure of the first to third brake circuits and the current air pressure of the first to third brake circuits; and obtaining an air tightness detection result of the air pressure braking system according to the first air pressure difference of the first to third braking loops. Therefore, the problems of time-consuming and labor-consuming air leakage detection on each point of the brake system before the heavy truck is started are solved, air leakage detection can be carried out on all connecting devices of the brake system when the truck is started, the abnormal condition of brake air pressure can be found in time, the air leakage position can be quickly locked, the maintenance efficiency is improved, and the driving and parking safety is ensured.

Description

Technical Field

[0001] This application relates to the technical field of vehicles, and particularly to an airtightness detection method, device, vehicle, and computer program product. Background Art

[0002] As an important means of transportation in logistics transportation and engineering construction, heavy trucks generally adopt a pneumatic braking system due to their large load capacity and the need for strong braking force during driving to ensure safety. The pneumatic braking system, with its characteristics of rapid response and large braking force, has become the first choice for heavy truck braking systems. This system mainly consists of core components such as an energy supply device, an energy storage device, a control device, and an energy transmission device, and realizes the braking operation of the vehicle by using compressed air as the power medium.

[0003] However, the complexity of the pneumatic braking system and the widely distributed components also bring a series of safety hazards. There are a large number of connecting components such as valves, pipelines, and joints in the system. During long-term use, these components may leak air due to wear, aging, vibration, or improper installation. Especially some slow air leakage situations, because they are not easily detectable, often become safety hazards overlooked by drivers. Due to the concealment of the positions of some air leakage points or the characteristics that only appear under specific operating conditions, it is difficult to detect and locate them without performing relevant operations (such as braking operations, system pressure tests, etc.), which will cause great safety hazards during driving or parking.

[0004] Traditionally, in order to ensure the reliability of the braking system, drivers or maintenance personnel need to check each point of the braking system for air leakage one by one before starting the vehicle each time, which is time-consuming and laborious. Summary of the Invention

[0005] This application provides an airtightness detection method, device, vehicle, and computer program product to solve the problems of time-consuming and laborious air leakage inspection of each point of the braking system before starting a heavy truck.

[0006] In a first aspect embodiment of this application, an airtightness detection method is provided. The vehicle includes a pneumatic braking system, and the pneumatic braking system includes first to third braking circuits. Wherein, the method includes the following steps: when the vehicle is in a parked state, determine whether the current air pressures of the first to third braking circuits are all greater than or equal to a preset starting air pressure; if the current air pressures of the first to third braking circuits are all greater than or equal to the preset starting air pressure, then detect the first air pressures of the first to third braking circuits after a first preset duration, and obtain the first air pressure differences of the first to third braking circuits based on the first air pressures and the current air pressures of the first to third braking circuits; obtain the airtightness detection result of the pneumatic braking system according to the first air pressure differences of the first to third braking circuits.

[0007] Optionally, obtaining the airtightness detection result of the pneumatic braking system according to the first air pressure difference of the first to third braking circuits includes: if the first air pressure difference of the first braking circuit is greater than the first preset threshold, the airtightness detection result is that the leakage position is in the first part of the first braking circuit; and / or, if the first air pressure difference of the second braking circuit is greater than the first preset threshold, the airtightness detection result is that the leakage position is in the first part of the second braking circuit; and / or, if the first air pressure difference of the third braking circuit is greater than the first preset threshold, the airtightness detection result is that the leakage position is in the first part of the third braking circuit.

[0008] Through the above technical solution, by independently monitoring the air pressure differences of the first to third braking circuits, it is possible to quickly determine whether leakage occurs in the "first part" of the corresponding circuit. This sub-region detection logic significantly narrows the scope of leakage investigation, avoids the cumbersome process of checking the entire system one by one, and improves the detection efficiency.

[0009] Optionally, after obtaining the airtightness detection result of the pneumatic braking system according to the first air pressure difference of the first to third braking circuits, it further includes: if the airtightness detection result is that there is no leakage position, perform service braking on the vehicle and release the parking brake, detect the second air pressure of the first to third braking circuits, and detect the third air pressure of the first to third braking circuits after a second preset duration; obtain the second air pressure differences of the first to third braking circuits based on the third air pressure and the second air pressure of the first to third braking circuits, and update the airtightness detection result based on the second air pressure differences of the first to third braking circuits.

[0010] Through the above technical solution, by detecting the air pressure of each circuit in the parked state and the released parking state, the full operating condition leakage scenarios of the braking system from dormancy to activation are covered, improving the ability to identify micro-leaks.

[0011] Optionally, updating the airtightness detection result based on the second air pressure differences of the first to third braking circuits includes: if the second air pressure difference of the first braking circuit is greater than the second preset threshold, the airtightness detection result is that the leakage position is in the second part of the first braking circuit; and / or, if the second air pressure difference of the second braking circuit is greater than the second preset threshold, the airtightness detection result is that the leakage position is in the second part of the second braking circuit; and / or, if the second air pressure difference of the third braking circuit is greater than the second preset threshold, the airtightness detection result is that the leakage position is in the second part of the third braking circuit.

[0012] Through the above technical solution, by performing service braking on the vehicle and releasing the parking brake to simulate the driving condition, the circuit that was originally in a non-operating state is exposed to a pressure environment, thereby discovering leakage points that cannot be detected by static detection. The secondary pressure difference detection method (second air pressure difference) is adopted. By extending the detection duration and accumulating minute leakage amounts, the air pressure change caused by slow leakage reaches the detectable threshold, significantly improving the ability to identify micro-leaks.

[0013] Optionally, after determining whether the current air pressure of each circuit of the vehicle's air braking system is greater than the vehicle's starting air pressure, it further includes: if the current air pressure of any one braking circuit is less than the starting air pressure, then ventilate the any one braking circuit until the current air pressure of the any one braking circuit is greater than or equal to the starting air pressure.

[0014] Through the above technical solution, before the vehicle starts, all braking circuits must reach the minimum operating pressure. Otherwise, the braking effect may be insufficient. By automatically replenishing air, it can ensure that the system is always in an available state and improve safety.

[0015] An embodiment of the second aspect of the present application provides an airtightness detection device. The vehicle includes an air braking system, and the air braking system includes a first to a third braking circuit. Wherein, the device includes: a judgment module, configured to judge whether the current air pressure of the first to the third braking circuits is greater than or equal to a preset starting air pressure when the vehicle is in a parked state; an acquisition module, configured to, if the current air pressure of the first to the third braking circuits is greater than or equal to the preset starting air pressure, detect the first air pressure of the first to the third braking circuits after a first preset duration, and obtain the first air pressure difference of the first to the third braking circuits based on the first air pressure and the current air pressure of the first to the third braking circuits; a detection module, configured to obtain the airtightness detection result of the air braking system according to the first air pressure difference of the first to the third braking circuits.

[0016] Optionally, the detection module is configured to: if the first air pressure difference of the first braking circuit is greater than the first preset threshold, then the airtightness detection result is that the leakage position is in the first part of the first braking circuit; and / or, if the first air pressure difference of the second braking circuit is greater than the first preset threshold, then the airtightness detection result is that the leakage position is in the first part of the second braking circuit; and / or, if the first air pressure difference of the third braking circuit is greater than the first preset threshold, then the airtightness detection result is that the leakage position is in the first part of the third braking circuit.

[0017] Optionally, after obtaining the airtightness detection result of the pneumatic braking system according to the first air pressure difference of the first to third braking circuits, the detection module is configured to: if the airtightness detection result is a non-leakage position, perform service braking on the vehicle and release the parking brake, detect the second air pressure of the first to third braking circuits, and detect the third air pressure of the first to third braking circuits after a second preset time period; obtain a second air pressure difference of the first to third braking circuits based on the third air pressure and the second air pressure of the first to third braking circuits, and update the airtightness detection result based on the second air pressure difference of the first to third braking circuits.

[0018] Optionally, the detection module is configured to: if the second air pressure difference of the first braking circuit is greater than the second preset threshold, the airtightness detection result is that the leakage position is in the second part of the first braking circuit; and / or, if the second air pressure difference of the second braking circuit is greater than the second preset threshold, the airtightness detection result is that the leakage position is in the second part of the second braking circuit; and / or, if the second air pressure difference of the third braking circuit is greater than the second preset threshold, the airtightness detection result is that the leakage position is in the second part of the third braking circuit.

[0019] Optionally, after determining whether the current air pressure of each circuit of the pneumatic braking system of the vehicle is greater than the starting air pressure of the vehicle, the determination module is further configured to: if the current air pressure of any one braking circuit is less than the starting air pressure, supply air to the any one braking circuit until the current air pressure of the any one braking circuit is greater than or equal to the starting air pressure.

[0020] An embodiment of the third aspect of the present application provides a vehicle, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor executes the program to implement the airtightness detection method as described in the above embodiment.

[0021] An embodiment of the fourth aspect of the present application provides a computer program product, on which a computer program is stored, and the program is executed by a processor to implement the airtightness detection method as described in the above embodiment.

[0022] In the above embodiments, when the vehicle is in a parked state, it is determined whether the current air pressures of the first to third brake circuits are all greater than or equal to a preset starting air pressure. If the current air pressures of the first to third brake circuits are all greater than or equal to the preset starting air pressure, then after a first preset duration, the first air pressures of the first to third brake circuits are detected, and based on the first air pressures and the current air pressures of the first to third brake circuits, the first air pressure differences of the first to third brake circuits are obtained. The airtightness detection result of the air brake system is obtained according to the first air pressure differences of the first to third brake circuits. Thus, problems such as time-consuming and laborious leakage inspection of each point of the brake system before starting a heavy truck are solved. The leakage detection of all connection devices of the brake system can be performed remotely or when the vehicle starts, abnormal air brake conditions can be detected in a timely manner to ensure driving and parking safety, and the leakage location can be quickly and accurately locked to improve the maintenance efficiency.

[0023] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0025] Figure 1 is a flowchart of an airtightness detection method according to an embodiment of the present application;

[0026] Figure 2 is a schematic structural diagram of an air brake system according to an embodiment of the present application;

[0027] Figure 3 is a flowchart of an airtightness detection method according to an embodiment of the present application;

[0028] Figure 4 is an example diagram of an airtightness detection device according to an embodiment of the present application;

[0029] Figure 5 is a schematic diagram of a vehicle structure according to an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application.

[0031] The airtightness detection method, device, vehicle and computer program product of the embodiments of the present application will be described below with reference to the accompanying drawings. In view of the problem of time-consuming and laborious leakage inspection of each point of the braking system before starting a heavy truck mentioned in the above background art, the present application provides an airtightness detection method. In this method, when the vehicle is in a parked state, it is determined whether the current air pressures of the first to third braking circuits are all greater than or equal to a preset starting air pressure; if the current air pressures of the first to third braking circuits are all greater than or equal to the preset starting air pressure, then after a first preset time period, the first air pressures of the first to third braking circuits are detected, and based on the first air pressures and the current air pressures of the first to third braking circuits, the first air pressure differences of the first to third braking circuits are obtained, and the airtightness detection result of the air pressure braking system is obtained according to the first air pressure differences of the first to third braking circuits. Thus, the problems of time-consuming and laborious leakage inspection of each point of the braking system before starting a heavy truck are solved. It is possible to remotely or when the vehicle starts to detect air leakage of all connecting devices of the braking system, timely discover abnormal air pressure in the braking system, ensure driving and parking safety, and can also quickly and accurately lock the air leakage position, improving the maintenance efficiency.

[0032] In the prior art, although there are some airtightness detection systems and methods, such as the invention patent CN107588904A, this system is mainly used for airtightness detection when the whole vehicle comes off the production line to ensure that the vehicle meets relevant regulatory requirements. However, when the vehicle enters the market, due to various restrictions, this system cannot achieve real-time and dynamic monitoring of the vehicle braking system. This means that once an air leakage problem occurs during the operation of the vehicle, it is very likely that it cannot be discovered in time, thus bringing great potential safety hazards to driving and parking safety.

[0033] In addition, although the invention patent CN110595701A adds an on-vehicle terminal and a networking platform on the original basis to achieve real-time monitoring of the vehicle air pressure state, due to the limitations of the electronic control technology at that time, this system still cannot accurately judge whether there is air leakage at some connection points of the vehicle braking system (such as the pipeline between the valve and the air chamber). More importantly, even if the system can detect abnormal air pressure, it cannot accurately lock the specific air leakage position, which undoubtedly increases the difficulty and time cost of maintenance.

[0034] In summary, there are obvious deficiencies in the prior art in terms of airtightness detection and air leakage point locking of the air pressure braking system. On the one hand, it is impossible to achieve real-time and comprehensive monitoring of the vehicle braking system; on the other hand, even if abnormal air pressure is detected, it is impossible to quickly and accurately lock the air leakage position. These shortcomings not only affect driving and parking safety, but also bring great inconvenience to vehicle maintenance and repair.

[0035] In view of these shortcomings, the present application provides an airtightness detection method. The flow chart of the airtightness detection method is as follows: Figure 1 shown.

[0036] The vehicle includes an air brake system, the structure of which is as follows: Figure 2 As shown, the pneumatic brake system consists of four circuits: front brake circuit, rear brake circuit, parking circuit, and electronic control circuit, including an air compressor 1, an air processing unit 2, a front axle brake module 3, a rear brake air reservoir 4, a front brake air reservoir 5, a parking air reservoir 6, a drain valve 7, a foot brake valve 8, an electronic parking valve 9, an ABS valve 10, a rear axle brake module 11, an air pressure sensor 12, a composite brake air chamber 13, a brake air chamber 14, a controller 15, and a mobile terminal 16. Relevant operations can be performed on the vehicle or on the mobile terminal.

[0037] An air pressure sensor is added between the front brake air reservoir, the rear brake air reservoir and the parking air reservoir, and electronically controlled driving and parking brakes are adopted. The air pressure sensor is integrated in the front brake module, the rear axle brake module and the air outlet of the electronic parking valve. The controller can actively control the driving brake and the parking brake to realize the ventilation or air cut-off of each circuit, and collect the air pressure of the relevant points in real time through the air pressure sensor to realize the self-inspection of the air tightness of the whole vehicle and the preliminary judgment of the leakage point.

[0038] Specific as Figure 1 As shown, the airtightness detection method comprises the following steps:

[0039] In step S101 , when the vehicle is in a parking state, it is determined whether the current air pressures of the first to third brake circuits are all greater than or equal to a preset starting air pressure.

[0040] The first brake circuit is Figure 2 The front brake circuit in the second brake circuit is Figure 2 The rear brake circuit in the third brake circuit is Figure 2 In the parking circuit, the preset starting pressure refers to the pressure set by the vehicle manufacturer at which the vehicle can start safely.

[0041] Specifically, the operator stops the vehicle and puts it in the parking state, the air pressure sensor reads the current air pressure of the front brake circuit, the rear brake circuit and the parking circuit, and determines whether the current air pressure of the front brake circuit, the rear brake circuit and the parking circuit are all greater than or equal to the preset starting air pressure.

[0042] Optionally, in some embodiments, after determining whether the current air pressure of each circuit of the vehicle's pneumatic brake system is greater than the vehicle's starting air pressure, it also includes: if the current air pressure of any brake circuit is less than the starting air pressure, ventilating any brake circuit until the current air pressure of any brake circuit is greater than or equal to the starting air pressure.

[0043] It should be understood that if it is found that the current air pressure in any one of the front brake circuit, rear brake circuit and parking circuit is less than the preset starting air pressure, it is determined which or which brake circuits have a current air pressure lower than the preset starting air pressure. For the circuit with insufficient air pressure, the air compressor in the air brake system is started to supply compressed air to this circuit.

[0044] During the air supply process, the air pressure change of this circuit is continuously monitored until it reaches or exceeds the preset starting air pressure.

[0045] In step S102, if the current air pressures of the first to third brake circuits are all greater than or equal to the preset starting air pressure, then after a first preset time period, the first air pressures of the first to third brake circuits are detected, and based on the first air pressures and the current air pressures of the first to third brake circuits, the first air pressure differences of the first to third brake circuits are obtained.

[0046] Wherein, the first air pressure difference is the value obtained by subtracting the first air pressure from the current air pressure. The first preset time period can be a threshold preset by the user, a threshold obtained through a limited number of experiments, or a threshold obtained through a limited number of computer simulations, and no specific limitation is made here.

[0047] It can be understood that once it is confirmed that the air pressures of all brake circuits meet the starting requirements, then after a first preset time period, the air pressure sensor is used again to detect the first air pressures of the front brake circuit, rear brake circuit and parking circuit, calculate the difference between the current air pressure and the first air pressure of the front brake circuit to obtain the first air pressure difference of the front brake circuit, calculate the difference between the current air pressure and the first air pressure of the rear brake circuit to obtain the first air pressure difference of the rear brake circuit, and calculate the difference between the current air pressure and the first air pressure of the parking circuit to obtain the first air pressure difference of the parking circuit.

[0048] In step S103, the airtightness detection result of the air brake system is obtained according to the first air pressure differences of the first to third brake circuits.

[0049] Optionally, in some embodiments, obtaining the airtightness detection result of the air brake system according to the first air pressure differences of the first to third brake circuits includes: if the first air pressure difference of the first brake circuit is greater than the first preset threshold, the airtightness detection result is that the leakage location is in the first part of the first brake circuit; and / or, if the first air pressure difference of the second brake circuit is greater than the first preset threshold, the airtightness detection result is that the leakage location is in the first part of the second brake circuit; and / or, if the first air pressure difference of the third brake circuit is greater than the first preset threshold, the airtightness detection result is that the leakage location is in the first part of the third brake circuit.

[0050] Among them, the first preset threshold can be a threshold preset by the user, a threshold obtained through a limited number of experiments, or a threshold obtained through a limited number of computer simulations, and no specific limitation is made here.

[0051] Taking Figure 2 as an example, the first part of the front brake circuit is 2→5→3 and 8, the first part of the rear brake circuit is 2→4→11 and 8, and the first part of the parking circuit is 2→6→9.

[0052] If the first air pressure difference of the front brake circuit is greater than the first preset threshold, it is determined that the leakage position is in the first part of the front brake circuit; if the first air pressure difference of the rear brake circuit is greater than the first preset threshold, it is determined that the leakage position is in the first part of the rear brake circuit; if the first air pressure difference of the parking circuit is greater than the first preset threshold, it is determined that the leakage position is in the first part of the parking circuit.

[0053] If the first air pressure differences of the front brake circuit, the rear brake circuit, and the parking circuit are all greater than the first preset threshold, it is determined that the leakage positions are the first part of the front brake circuit, the first part of the rear brake circuit, and the first part of the parking circuit, that is, the leakage positions are 2→5→3 and 8 of the front brake circuit, 2→4→11 and 8 of the rear brake circuit, and 2→6→9 of the parking circuit.

[0054] At this time, the vehicle is powered off, and the current leakage position is sent to the mobile terminal to remind the operator to perform necessary repairs or replacements.

[0055] For example, the first preset threshold is set to 0.5 bar, the first preset duration is 30 s. If the current air pressure of the front brake circuit is 8.0 (bar) and the first air pressure after 30 s is 7.2 (bar), then the first air pressure difference is 0.8 (bar); if the current air pressure of the rear brake circuit is 8.0 (bar) and the first air pressure after 30 s is 7.6 (bar), then the first air pressure difference is 0.4 (bar); if the current air pressure of the parking circuit is 8.0 (bar) and the first air pressure after 30 s is 7.5 (bar), then the first air pressure difference is 0.5 (bar).

[0056] Result determination:

[0057] The first air pressure difference of the front brake circuit > 0.5 bar, and the leakage position is determined to be 2→5→3 and 8 of the front brake circuit;

[0058] The first air pressure difference of the rear brake circuit < 0.5 bar, it is determined that there is no leakage in this area, and subsequent dynamic detection is required.

[0059] The first air pressure difference of the parking circuit = 0.5 bar, it is determined that there is no leakage in this area, and subsequent dynamic detection is required.

[0060] Optionally, in some embodiments, after obtaining the airtightness detection result of the pneumatic braking system according to the first air pressure difference of the first to third braking circuits, the method further includes: if the airtightness detection result is a non-leakage position, performing service braking on the vehicle and releasing the parking brake, detecting the second air pressure of the first to third braking circuits, and detecting the third air pressure of the first to third braking circuits after a second preset duration; obtaining the second air pressure difference of the first to third braking circuits based on the third air pressure and the second air pressure of the first to third braking circuits, and updating the airtightness detection result based on the second air pressure difference of the first to third braking circuits.

[0061] Wherein, the second air pressure difference is the value obtained by subtracting the third air pressure from the second air pressure. The second preset duration can be a threshold preset by the user, a threshold obtained through a finite number of experiments, or a threshold obtained through a finite number of computer simulations, and is not specifically limited herein.

[0062] Specifically, after obtaining the airtightness detection result of the pneumatic braking system according to the first air pressure difference of the front braking circuit, rear braking circuit, and parking circuit, if the airtightness detection result is a non-leakage position, that is, the first air pressure differences of the front braking circuit, rear braking circuit, and parking circuit are all less than or equal to the first preset threshold, the controller sends a service braking signal to perform service braking and releases the parking brake of the vehicle, immediately uses an air pressure sensor to record the second air pressure values of the front braking circuit, rear braking circuit, and parking circuit, and after the second preset duration, uses the air pressure sensor again to record the third air pressure values of the front braking circuit, rear braking circuit, and parking circuit.

[0063] Further, calculate the difference between the second air pressure and the third air pressure of the front braking circuit to obtain the second air pressure difference of the front braking circuit, calculate the difference between the second air pressure and the third air pressure of the rear braking circuit to obtain the second air pressure difference of the rear braking circuit, and calculate the difference between the second air pressure and the third air pressure of the parking circuit to obtain the second air pressure difference of the parking circuit.

[0064] Further, in some embodiments, updating the airtightness detection result based on the second air pressure difference of the first to third braking circuits includes: if the second air pressure difference of the first braking circuit is greater than the second preset threshold, the airtightness detection result is that the leakage position is in the second part of the first braking circuit; and / or, if the second air pressure difference of the second braking circuit is greater than the second preset threshold, the airtightness detection result is that the leakage position is in the second part of the second braking circuit; and / or, if the second air pressure difference of the third braking circuit is greater than the second preset threshold, the airtightness detection result is that the leakage position is in the second part of the third braking circuit.

[0065] Among them, the second preset threshold can be a threshold preset by the user, a threshold obtained through a limited number of experiments, or a threshold obtained through a limited number of computer simulations, and no specific limitation is made here.

[0066] Taking Figure 2 as an example, the second part of the front brake circuit is: 8 → 3 → 10 → 14, the second part of the rear brake circuit is 8 → 11 → 13, and the second part of the parking brake circuit is 9 → 13.

[0067] It can be understood that if the second air pressure difference of the front brake circuit is greater than the second preset threshold, the airtightness detection result is updated, and the leakage position is in the second part of the front brake circuit; if the second air pressure difference of the rear brake circuit is greater than the second preset threshold, the airtightness detection result is updated, and the leakage position is in the second part of the rear brake circuit; if the second air pressure difference of the parking brake circuit is greater than the second preset threshold, the airtightness detection result is updated, and the leakage position is in the second part of the parking brake circuit.

[0068] If the second air pressure difference of the front brake circuit is greater than the second preset threshold, the second air pressure difference of the rear brake circuit is greater than the second preset threshold, and the second air pressure difference of the parking brake circuit is greater than the second preset threshold, then the leakage positions are the second part of the front brake circuit, the second part of the rear brake circuit, and the second part of the parking brake circuit, that is, the leakage positions are 8 → 3 → 10 → 14 of the front brake circuit, 8 → 11 → 13 of the rear brake circuit, and 9 → 13 of the parking brake circuit.

[0069] At this time, the vehicle is powered off, and the current leakage position is sent to the mobile terminal to remind the operator to perform necessary repairs or replacements.

[0070] If the front brake circuit, the rear brake circuit, and the parking brake circuit are all okay, it is confirmed that the airtightness of the pneumatic braking system is good, and the vehicle can drive safely.

[0071] For example, the second preset threshold is set to 0.3 bar, the second preset duration is 30 s. If the second air pressure of the front brake circuit when releasing the parking brake is 8.0 (bar), and the third air pressure after 30 s is 7.4 (bar), the second air pressure difference of the front brake circuit is 0.6 (bar); if the second air pressure of the rear brake circuit when releasing the parking brake is 8.0 (bar), and the third air pressure after 30 s is 7.8 (bar), the second air pressure difference of the rear brake circuit is 0.2 (bar); if the second air pressure of the parking brake circuit when releasing the parking brake is 8.0 (bar), and the third air pressure after 30 s is 7.6 (bar), the second air pressure difference of the parking brake circuit is 0.4 (bar).

[0072] Result determination:

[0073] If the second air pressure difference of the front brake circuit > 0.3 bar, the leakage position is determined to be the second part of the first brake circuit;

[0074] If the second air pressure difference of the rear brake circuit < 0.3 bar, it is determined that there is no leakage in this area;

[0075] If the second air pressure difference of the parking brake circuit > 0.3 bar, the leakage position is determined to be the second part of the third brake circuit.

[0076] To enable those skilled in the art to further understand the airtightness detection method of the embodiments of the present application, the following will be elaborated in detail in combination with specific embodiments, as Figure 3 shown.

[0077] Step 1: The vehicle is in the parked state, the vehicle is powered on, and it is detected whether the air pressure of the front brake circuit, rear brake circuit, and parking brake circuit is greater than the starting air pressure. If it is not greater than the starting air pressure, go to Step 2; otherwise, go to Step 3;

[0078] Step 2: Start the air compressor to inflate, and stop inflating after each circuit reaches the vehicle starting air pressure;

[0079] Step 3: The controller records the current air pressure p1 of the front brake circuit, rear brake circuit, and parking brake circuit. After maintaining the state for 30 s, record the air pressure p2 of each circuit, and give the first air pressure difference p3 before and after each circuit (p3 = p1 - p2), and determine whether the first air pressure difference p3 of each circuit is greater than the first preset threshold. If it is greater, go to Step 4; otherwise, go to Step 5;

[0080] Step 4: Stop the self-check, power off the vehicle, and give the circuit where the specific leakage point is located and repair it, and remind the driver to re-execute Step 1 after repair;

[0081] Step 5: The controller sends a service brake signal and releases the parking brake, records the air pressure p4 of each circuit, maintains the state for 30 s, records the air pressure p5 of each circuit, and gives the second air pressure difference p6 before and after each circuit (p6 = p4 - p5), and determines whether the second air pressure difference p6 is greater than the second preset threshold. If it is greater, go to Step 6; otherwise, it is determined that there is no leakage position in each circuit;

[0082] Step 6: Stop the self-check, power off the vehicle, and give the circuit where the specific leakage point is located and repair it, and remind the driver to re-execute Step 1 after repair.

[0083] According to the airtightness detection method provided by the embodiments of the present application, when the vehicle is in a parked state, it is determined whether the current air pressures of the first to third brake circuits are all greater than or equal to a preset starting air pressure. If the current air pressures of the first to third brake circuits are all greater than or equal to the preset starting air pressure, then after a first preset time period, the first air pressures of the first to third brake circuits are detected, and based on the first air pressures and the current air pressures of the first to third brake circuits, the first air pressure differences of the first to third brake circuits are obtained. The airtightness detection result of the pneumatic braking system is obtained according to the first air pressure differences of the first to third brake circuits. Thereby, the problems of time-consuming and laborious leakage inspection of each point of the braking system before starting a heavy truck are solved. All leakage points of the vehicle can be comprehensively detected to ensure the safety of the braking system and prevent problems before they occur. If there is a leakage point, the leakage point can be initially locked within a small range at the same time, without checking each point of the whole vehicle one by one, improving the maintenance efficiency. This technical solution can also be used for airtightness detection when the whole vehicle rolls off the production line at the factory.

[0084] Next, the airtightness detection device according to the embodiments of the present application will be described with reference to the accompanying drawings.

[0085] Figure 4 It is a block diagram of the airtightness detection device according to the embodiments of the present application.

[0086] As Figure 4 shown, the airtightness detection device 10 includes: a judgment module 100, an acquisition module 200, and a detection module 300.

[0087] Among them, the judgment module 100 is used to judge whether the current air pressures of the first to third brake circuits are all greater than or equal to a preset starting air pressure when the vehicle is in a parked state; the acquisition module 200 is used to detect the first air pressures of the first to third brake circuits after a first preset time period if the current air pressures of the first to third brake circuits are all greater than or equal to the preset starting air pressure, and obtain the first air pressure differences of the first to third brake circuits based on the first air pressures and the current air pressures of the first to third brake circuits; the detection module 300 is used to obtain the airtightness detection result of the pneumatic braking system according to the first air pressure differences of the first to third brake circuits.

[0088] Optionally, in some embodiments, the detection module 300 is used for: if the first air pressure difference of the first brake circuit is greater than a first preset threshold, the airtightness detection result is that the leakage position is in the first part of the first brake circuit; and / or, if the first air pressure difference of the second brake circuit is greater than the first preset threshold, the airtightness detection result is that the leakage position is in the first part of the second brake circuit; and / or, if the first air pressure difference of the third brake circuit is greater than the first preset threshold, the airtightness detection result is that the leakage position is in the first part of the third brake circuit.

[0089] Optionally, in some embodiments, after obtaining the airtightness detection result of the pneumatic braking system according to the first air pressure difference of the first to third braking circuits, the detection module 300 is configured to: if the airtightness detection result is a non-leak position, perform service braking on the vehicle and release the parking brake, detect the second air pressure of the first to third braking circuits, and detect the third air pressure of the first to third braking circuits after a second preset time period; obtain the second air pressure difference of the first to third braking circuits based on the third air pressure and the second air pressure of the first to third braking circuits, and update the airtightness detection result based on the second air pressure difference of the first to third braking circuits.

[0090] Optionally, in some embodiments, the detection module 300 is configured to: if the second air pressure difference of the first braking circuit is greater than a second preset threshold, the airtightness detection result is that the leakage position is in the second part of the first braking circuit; and / or, if the second air pressure difference of the second braking circuit is greater than the second preset threshold, the airtightness detection result is that the leakage position is in the second part of the second braking circuit; and / or, if the second air pressure difference of the third braking circuit is greater than the second preset threshold, the airtightness detection result is that the leakage position is in the second part of the third braking circuit.

[0091] Optionally, in some embodiments, after determining whether the current air pressure of each circuit of the pneumatic braking system of the vehicle is greater than the starting air pressure of the vehicle, the determination module 100 is further configured to: if the current air pressure of any braking circuit is less than the starting air pressure, supply air to any braking circuit until the current air pressure of any braking circuit is greater than or equal to the starting air pressure.

[0092] It should be noted that the foregoing explanation of the embodiments of the airtightness detection method also applies to the airtightness detection device of this embodiment, and will not be elaborated here.

[0093] According to the airtightness detection device provided by the embodiments of the present application, when the vehicle is in a parked state, it is determined whether the current air pressures of the first to third braking circuits are all greater than or equal to a preset starting air pressure; if the current air pressures of the first to third braking circuits are all greater than or equal to the preset starting air pressure, the first air pressures of the first to third braking circuits are detected after a first preset time period, and the first air pressure differences of the first to third braking circuits are obtained based on the first air pressures and the current air pressures of the first to third braking circuits, and the airtightness detection result of the pneumatic braking system is obtained according to the first air pressure differences of the first to third braking circuits. Thereby, problems such as time-consuming and laborious for leak inspection of each point of the braking system before starting a heavy truck are solved. It is possible to remotely or detect air leakage of all connection devices of the braking system when the vehicle is started, timely discover abnormal braking air pressure conditions, ensure driving and parking safety, and can quickly and accurately lock the air leakage position to improve the maintenance efficiency.

[0094] Figure 5 This is a schematic structural diagram of a vehicle provided by an embodiment of the present application. The vehicle may include:

[0095] A memory 501, a processor 502, and a computer program stored on the memory 501 and executable on the processor 502.

[0096] When the processor 502 executes the program, it implements the airtightness detection method provided in the above embodiment.

[0097] Furthermore, the vehicle further includes:

[0098] A communication interface 503 for communication between the memory 501 and the processor 502.

[0099] The memory 501 is used to store a computer program executable on the processor 502.

[0100] The memory 501 may include a high-speed RAM memory, and may also include a non-volatile memory, such as at least one disk memory.

[0101] If the memory 501, the processor 502, and the communication interface 503 are implemented independently, the communication interface 503, the memory 501, and the processor 502 may be interconnected through a bus and communicate with each other. The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For the sake of simplicity of representation, Figure 5 only a thick line is shown in the figure, but it does not mean that there is only one bus or one type of bus.

[0102] Optionally, in a specific implementation, if the memory 501, the processor 502, and the communication interface 503 are integrated on a chip, the memory 501, the processor 502, and the communication interface 503 may communicate with each other through an internal interface.

[0103] The processor 502 may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0104] The embodiments of the present application further provide a computer program product, on which a computer program is stored, and when the program is executed by a processor, the airtightness detection method as described above is implemented.

[0105] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0106] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "N" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0107] Any process or method description in the flowchart or described in other ways herein can be understood as representing a module, segment, or part of code including one or more executable instructions for implementing a customized logic function or process, and the scope of the preferred embodiments of the present application includes additional implementations, where the functions may be executed in a substantially simultaneous manner or in a reverse order according to the involved functions, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0108] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definable sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer program product for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or used in combination with these instruction execution systems, apparatus, or devices. For the purposes of this specification, a "computer program product" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in combination with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer program products include the following: an electrical connection part (electronic device) having one or N wirings, a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer program product can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then storing it in a computer memory.

[0109] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits having suitable combinational logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0110] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the method of implementing the above embodiments can be completed by a program instructing relevant hardware, and the program can be stored in a computer program product. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0111] In addition, each functional unit in various embodiments of the present application may be integrated into a processing module, or each unit may exist physically alone, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer program product.

[0112] The above-mentioned computer program product may be a read-only memory, a magnetic disk, an optical disc, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A method for detecting air tightness, characterized in that: The vehicle comprises a pneumatic brake system, the pneumatic brake system comprising first to third brake circuits, wherein the method comprises the following steps: When the vehicle is in a parking state, determining whether current air pressures of the first to third brake circuits are all greater than or equal to a preset starting air pressure; If the current air pressures of the first to third brake circuits are all greater than or equal to the preset starting air pressure, detecting the first air pressures of the first to third brake circuits after a first preset time, and obtaining first air pressure differences of the first to third brake circuits based on the first air pressures of the first to third brake circuits and the current air pressures of the first to third brake circuits; An air tightness detection result of the pneumatic brake system is obtained according to a first air pressure difference between the first to third brake circuits.

2. The method according to claim 1, characterized in that The step of obtaining the air tightness test result of the pneumatic brake system according to the first air pressure difference between the first to third brake circuits includes: If the first air pressure difference of the first brake circuit is greater than the first preset threshold, the air tightness detection result is that the leakage position is in the first part of the first brake circuit; and / or, if the first air pressure difference of the second brake circuit is greater than the first preset threshold value, the air tightness detection result is that the leakage position is in the first part of the second brake circuit; And / or, if the first air pressure difference of the third brake circuit is greater than the first preset threshold, the air tightness detection result is that the leakage position is located in the first part of the third brake circuit.

3. The method according to claim 1, characterized in that After obtaining the air tightness detection result of the pneumatic brake system according to the first air pressure difference between the first to third brake circuits, the method further includes: If the air tightness test result is that there is no leakage position, the vehicle is braked, the parking brake is released, the second air pressure of the first to third brake circuits is detected, and the third air pressure of the first to third brake circuits is detected after a second preset time period; A second air pressure difference between the first to third brake circuits is obtained based on the third air pressure of the first to third brake circuits and the second air pressure of the first to third brake circuits, and the air tightness detection result is updated based on the second air pressure difference between the first to third brake circuits.

4. The method according to claim 3, characterized in that: The updating of the air tightness detection result based on the second air pressure difference between the first to third brake circuits includes: If the second air pressure difference of the first brake circuit is greater than the second preset threshold, the air tightness detection result is that the leakage position is in the second part of the first brake circuit; and / or, if the second air pressure difference of the second brake circuit is greater than the second preset threshold, the air tightness detection result is that the leakage position is in the second part of the second brake circuit; And / or, if the second air pressure difference of the third brake circuit is greater than the second preset threshold, the air tightness detection result is that the leakage position is located in the second part of the third brake circuit.

5. The method according to claim 1, characterized in that After determining whether the current air pressure of each circuit of the air pressure brake system of the vehicle is greater than the starting air pressure of the vehicle, the method further includes: If the current air pressure of any brake circuit is lower than the starting air pressure, the brake circuit is ventilated until the current air pressure of any brake circuit is higher than or equal to the starting air pressure.

6. An airtightness detection device, characterized in that: The vehicle comprises a pneumatic brake system, the pneumatic brake system comprising first to third brake circuits, wherein the device comprises: a judgment module, used for judging whether the current air pressures of the first to third brake circuits are all greater than or equal to a preset starting air pressure when the vehicle is in a parking state; an acquisition module, configured to detect the first air pressures of the first to third brake circuits after a first preset time period if the current air pressures of the first to third brake circuits are all greater than or equal to the preset starting air pressure, and obtain first air pressure differences of the first to third brake circuits based on the first air pressures of the first to third brake circuits and the current air pressures of the first to third brake circuits; A detection module is used to obtain an air tightness detection result of the pneumatic brake system according to a first air pressure difference between the first to third brake circuits.

7. The device according to claim 6, characterized in that The detection module is used for: If the first air pressure difference of the first brake circuit is greater than the first preset threshold, the air tightness detection result is that the leakage position is in the first part of the first brake circuit; and / or, if the first air pressure difference of the second brake circuit is greater than the first preset threshold value, the air tightness detection result is that the leakage position is in the first part of the second brake circuit; And / or, if the first air pressure difference of the third brake circuit is greater than the first preset threshold, the air tightness detection result is that the leakage position is located in the first part of the third brake circuit.

8. The device according to claim 6, characterized in that After obtaining the air tightness detection result of the pneumatic brake system according to the first air pressure difference between the first to third brake circuits, the detection module is used to: If the air tightness test result is that there is no leakage position, the vehicle is braked, the parking brake is released, the second air pressure of the first to third brake circuits is detected, and the third air pressure of the first to third brake circuits is detected after a second preset time period; A second air pressure difference between the first to third brake circuits is obtained based on the third air pressure of the first to third brake circuits and the second air pressure of the first to third brake circuits, and the air tightness detection result is updated based on the second air pressure difference between the first to third brake circuits.

9. A vehicle, characterized in that: It comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the airtightness detection method as claimed in any one of claims 1 to 5.

10. A computer program product having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the airtightness detection method as described in any one of claims 1 to 5.

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