Method and device for judging in-place assembly of pressure retaining valve and vehicle

Abstract

The invention discloses a judgment method and device for in-place assembly of a pressure retaining valve and a vehicle, and relates to the technical field of vehicle assembly.The judgment method comprises the following steps that S10, a judgment instruction is responded to control a pressure release valve and a distribution valve of any air spring to be conducted; s20, the height value of the air spring is obtained, and the height change value of the air spring within the preset first duration is calculated; and S30, whether the pressure retaining valve of the air spring is assembled in place or not is judged according to the height change value of the air spring within the preset first duration. By the adoption of the judgment method, whether the pressure retaining valve of the air spring is assembled in place or not can be automatically judged, whether the pressure retaining valve is assembled in place or not can be judged without manual inspection of the air pipe scribed line, the missed judgment phenomenon can be avoided as much as possible, and the judgment accuracy is high.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle assembly, and in particular to a method and device for judging whether a pressure-maintaining valve is assembled in place, and a vehicle. Background Art

[0002] The pressure-maintaining valve of the air spring plays an important role similar to a one-way valve during the transportation of the air spring, ensuring that there is a certain amount of air pressure inside the air spring during transportation to prevent the bladder from being folded or punctured by sharp objects. At the same time, there is no need to inflate the air spring again during the production stage. After the pressure-maintaining valve and the air pipe of the vehicle's air suspension system are connected and assembled, it is necessary to check whether the pressure-maintaining valve is properly assembled. After the pressure-maintaining valve and the air pipe are properly assembled, it is equivalent to a two-way valve, which can ensure that the gas can be smoothly injected into or discharged from the air spring. Figure 1 However, if the pressure-maintaining valve and the air pipe are not properly assembled, the pressure-maintaining valve can only inflate the air spring in one direction, but cannot exhaust the air spring, resulting in the vehicle height not being able to be lowered normally. Figure 1 As shown on the left. That is, when the pressure-maintaining valve and the air pipe are properly assembled, it is bidirectional, and when the pressure-maintaining valve and the air pipe are not properly assembled, it is unidirectional. Whether the pressure-maintaining valve and the air pipe are properly assembled has a great impact on the entire vehicle air suspension system. If they are not properly assembled, the vehicle air suspension system will not work properly.

[0003] Since the pressure-maintaining valve is a mechanical component, it is impossible to diagnose whether it is properly assembled by electrical characteristics. The existing technology generally marks the air pipe and manually checks the air pipe marks to determine whether the pressure-maintaining valve is properly assembled. However, due to the high randomness of manual inspection, there may be missed judgments, and there is also a problem of low judgment accuracy. Summary of the invention

[0004] The embodiments of the present invention provide a method, device and vehicle for judging whether a pressure-maintaining valve is in place, so as to solve the technical problems in the related art of manually checking the air pipe markings to judge whether the pressure-maintaining valve is in place, resulting in missed judgments and low judgment accuracy.

[0005] In a first aspect, a method for determining whether a pressure-maintaining valve is properly assembled is provided, comprising the following steps:

[0006] In response to the judgment instruction, the pressure relief valve and the distribution valve of any air spring are controlled to be turned on;

[0007] Obtaining a height value of the air spring, and calculating a height change value of the air spring within a preset first time period;

[0008] Whether the pressure-maintaining valve of the air spring is assembled in place is determined according to a height change value of the air spring within a preset first time period.

[0009] In some embodiments, the step of judging whether the pressure-maintaining valve of the air spring is properly assembled according to the height change value of the air spring within a preset first time period includes:

[0010] Determine whether a height change value of the air spring within a preset first time period is greater than a preset first height threshold;

[0011] If yes, determine whether the pressure-maintaining valve of the air spring is properly assembled; if no, check whether the pressure relief valve and the distribution valve of the air spring are both normal;

[0012] If so, it is determined that the pressure-maintaining valve of the air spring is not properly assembled.

[0013] In some embodiments, the step of detecting whether the pressure relief valve and the distribution valve of the air spring are both normal includes:

[0014] Control the pressure relief valve to close and the distribution valve of the air spring to conduct;

[0015] Control the air pump to start or control the air tank to start, and the distribution valve of the air tank to be turned on;

[0016] Obtaining a height value of the air spring, and calculating a height change value of the air spring within a preset second time period;

[0017] Determine whether a height change value of the air spring within a preset second time period is greater than a preset second height threshold;

[0018] If yes, it is determined that the distribution valve of the air spring is normal; if no, it is determined that the distribution valve of the air spring is abnormal.

[0019] In some embodiments, after the step of determining whether the air spring distribution valve is normal, the method further comprises:

[0020] After the pressure relief valve is individually controlled to be turned on for a preset third time period, the pressure relief valve is controlled to be closed, and it is determined whether the pressure value in the pipeline is less than a preset pressure threshold;

[0021] If yes, the pressure relief valve is normal; if no, the pressure relief valve is abnormal.

[0022] In some embodiments, the step of determining whether the height change value of the air spring within a preset second time period is greater than a preset second height threshold comprises:

[0023] When the preset second time duration is 5s, the preset second height threshold is not less than 8mm.

[0024] In some embodiments, the step of determining whether the height change value of the air spring within a preset first time period is greater than a preset first height threshold comprises:

[0025] When the preset first time duration is 15s, the preset first height threshold is not less than 5mm.

[0026] In some embodiments, after the step of determining that the pressure-maintaining valve of the air spring is not properly assembled, the method further includes:

[0027] Generate a fault alarm signal and send it to the instrument display for display.

[0028] In some embodiments, after the step of detecting whether the pressure relief valve and the distribution valve of the air spring are both normal, the method further includes:

[0029] If not, replace the pressure relief valve and / or the distribution valve of the air spring until it is detected that the pressure relief valve and the distribution valve of the air spring are normal.

[0030] In a second aspect, a device for determining whether a pressure-maintaining valve is properly assembled is provided, comprising a vehicle controller, wherein the vehicle controller comprises:

[0031] A response unit, which is used to control the conduction of the pressure relief valve and the distribution valve of any air spring in response to the judgment instruction;

[0032] A calculation unit, which is used to obtain the height value of the air spring and calculate the height change value of the air spring within a preset first time period;

[0033] A judging unit is used to judge whether the pressure-maintaining valve of the air spring is assembled in place according to a height change value of the air spring within a preset first time period.

[0034] According to a third aspect, a vehicle is provided, comprising a device for determining whether the aforementioned pressure-maintaining valve is in place.

[0035] The beneficial effects brought about by the technical solution provided by the present invention include:

[0036] The embodiment of the present invention provides a method, device and vehicle for judging whether a pressure-maintaining valve is in place. The judgment method first responds to a judgment instruction to control the conduction of a pressure relief valve and a distribution valve of any air spring, then obtains the height value of the air spring, and calculates the height change value of the air spring within a preset first time length, and finally judges whether the pressure-maintaining valve of the air spring is in place according to the height change value of the air spring within the preset first time length. The present invention can automatically judge whether the pressure-maintaining valve of the air spring is in place through a vehicle controller, and does not need to manually check the air pipe mark line to judge whether the pressure-maintaining valve is in place, which can avoid missed judgment as much as possible, and has a high judgment accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 It is a schematic diagram of the assembly of the pressure-maintaining valve and the air pipe;

[0039] Figure 2 A flow chart of a method for determining whether a pressure-maintaining valve is properly assembled provided by an embodiment of the present invention;

[0040] Figure 3 Implementation provided for the embodiment of the present invention Figure 1 A flow chart of step S30;

[0041] Figure 4 A schematic diagram of a vehicle air suspension system provided by an embodiment of the present invention;

[0042] Figure 5 Implementation provided for the embodiment of the present invention Figure 2 A flow chart of step S302 in FIG.

[0043] Figure 6 Implementation provided for the embodiment of the present invention Figure 2 Another flow chart of step S302;

[0044] Figure 7 Another flow chart of a method for determining whether a pressure-maintaining valve is properly assembled provided by an embodiment of the present invention;

[0045] Figure 8 A schematic diagram of the structure of a device for judging whether a pressure-maintaining valve is properly assembled provided by an embodiment of the present invention;

[0046] In the figure:

[0047] 1. Pressure maintaining valve; 2. Air pipe; 3. Air spring; 4. Pressure relief valve; 5. Distribution valve; 6. Air pump; 7. Air storage tank. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] The embodiment of the present invention provides a method for judging whether a pressure-maintaining valve is properly assembled, which can solve the technical problems of the prior art of manually checking the air pipe mark line to judge whether the pressure-maintaining valve is properly assembled, resulting in missed judgments and low judgment accuracy.

[0050] See also Figure 2 As shown, an embodiment of the present invention provides a method for determining whether a pressure-maintaining valve is properly assembled, comprising the following steps:

[0051] Step S10, responding to the judgment instruction, controlling the pressure relief valve and the distribution valve of any air spring to be turned on.

[0052] Specifically, the pressure relief valve and the distribution valve of any air spring are connected to the vehicle controller. When the vehicle controller receives an instruction to determine whether the pressure holding valve is properly assembled, the pressure relief valve and the distribution valve of any air spring are controlled to be turned on.

[0053] Step S20, obtaining the height value of the air spring, and calculating the height change value of the air spring within a preset first time period.

[0054] Specifically, a height sensor is provided at any air spring, and the height sensor can collect the height value of the corresponding air spring and output the collected height value to the vehicle controller, and then the vehicle controller can calculate the height change value of the air spring within a preset first time length.

[0055] Step S30, judging whether the pressure-maintaining valve of the air spring is assembled in place according to the height change value of the air spring within a preset first time period.

[0056] Specifically, see Figure 3 As shown, the step of judging whether the pressure-maintaining valve of the air spring is assembled in place according to the height change value of the air spring within a preset first time period includes:

[0057] Step S301, determining whether a height change value of the air spring within a preset first time period is greater than a preset first height threshold.

[0058] Step S302, if yes, determine whether the pressure-maintaining valve of the air spring is properly assembled; if not, check whether the pressure relief valve and the distribution valve of the air spring are both normal.

[0059] Step S303: If yes, determine that the pressure-maintaining valve of the air spring is not properly assembled.

[0060] Optionally, the preset first duration is not less than 15 seconds, and the preset first height threshold is not less than 5 mm. Figure 4As shown, taking the leftmost air spring as an example, the preset first time length is 15s, and the preset first height threshold is 5mm. When it is necessary to determine whether the pressure-maintaining valve of the leftmost air spring is in place, the vehicle controller responds to the judgment instruction to control the pressure relief valve and the distribution valve of the leftmost air spring to be turned on, obtain the height value of the leftmost air spring, and calculate the height change value of the leftmost air spring 15s after the pressure relief valve and the distribution valve of the leftmost air spring are turned on: assuming that the height change value is greater than 5mm (the height of the leftmost air spring decreases by more than 5mm), it can be determined that the pressure-maintaining valve of the leftmost air spring is in place; assuming that the height change value is not greater than 5mm, further detect whether the pressure relief valve and the distribution valve of the leftmost air spring are normal. If the pressure relief valve and the distribution valve of the leftmost air spring are normal, eliminate the interference of the abnormal pressure relief valve and / or the leftmost air spring on the judgment process, and finally determine that the pressure-maintaining valve of the leftmost air spring is not in place.

[0061] The method for judging whether the pressure-maintaining valve is in place in the embodiment of the present invention first responds to the judgment instruction to control the pressure relief valve and the distribution valve of any air spring to be turned on, then obtains the height value of the air spring, and calculates the height change value of the air spring within the preset first time length, and finally judges whether the pressure-maintaining valve of the air spring is in place according to the height change value of the air spring within the preset first time length. That is, the present invention can automatically judge whether the pressure-maintaining valve of the air spring is in place by using the above judgment method, and does not need to manually check the air pipe mark line to judge whether the pressure-maintaining valve is in place, which can avoid the phenomenon of missed judgment as much as possible, and the judgment accuracy is high.

[0062] As an optional implementation, in an embodiment of the invention, see Figure 5 As shown, the step of detecting whether the pressure relief valve and the distribution valve of the air spring are both normal includes:

[0063] Step S3021, controlling the pressure relief valve to close and the distribution valve of the air spring to open.

[0064] Step S3022, control the air pump to start or control the air tank to start and the distribution valve of the air tank to turn on.

[0065] Step S3023, obtaining the height value of the air spring, and calculating the height change value of the air spring within a preset second time period.

[0066] Step S3024, determining whether the height change value of the air spring within a preset second time period is greater than a preset second height threshold.

[0067] Step S3025, if yes, determine that the distribution valve of the air spring is normal; if no, determine that the distribution valve of the air spring is abnormal.

[0068] Optionally, the preset second time duration is 5s, and the preset second height threshold is 8mm. Figure 4 As shown, taking the leftmost air spring as an example, when it is necessary to detect whether the pressure relief valve and the distribution valve of the air spring are normal, the vehicle controller controls the pressure relief valve to close and the distribution valve of the leftmost air spring to be turned on, and then controls the air pump to be turned on or the air tank to be turned on and the distribution valve of the air tank to be turned on, to obtain the height value of the air spring, and calculate the height change value of the leftmost air spring 5s after the air pump is turned on or the air tank is controlled to be turned on and the distribution valve of the air tank is turned on. Assuming that the height change value is greater than 8mm (the height increase of the leftmost air spring is greater than 8mm), it can be determined that the distribution valve of the leftmost air spring is normal; otherwise, it can be determined that the distribution valve of the leftmost air spring is abnormal.

[0069] As an optional implementation, in an embodiment of the invention, see Figure 6 As shown, if so, after the step of determining whether the air spring distribution valve is normal, the method includes:

[0070] Step S3026, controlling the pressure relief valve to be turned on for a preset third time period and then controlling the pressure relief valve to be closed, and determining whether the pressure value in the pipeline is less than a preset pressure threshold;

[0071] Step S3027, if yes, determine that the pressure relief valve is normal; if no, determine that the pressure relief valve is abnormal.

[0072] Optionally, the preset third time duration may be 5 seconds, and the preset pressure threshold may be 2 bar. Figure 4 As shown, the pressure relief valve is controlled to be turned on for 5s and then closed. The pressure sensor P in the pipeline is used to determine whether the pressure value in the pipeline is less than 2 bar. If so, the pressure relief valve is normal; if not, the pressure relief valve is abnormal.

[0073] As an optional implementation, in an embodiment of the invention, see Figure 7 As shown, if so, after the step of determining that the pressure-maintaining valve of the air spring is not properly assembled, the method includes:

[0074] Step S304: Generate a fault alarm signal and send it to the instrument display for display.

[0075] When it is determined that the pressure-maintaining valve of the air spring is not properly assembled, a fault alarm signal is generated and sent to the instrument display for display, which can remind the inspection personnel that there is an assembly failure and prompt the inspection personnel to reassemble it.

[0076] As an optional implementation, in an embodiment of the invention, after the step of detecting whether the pressure relief valve and the distribution valve of the air spring are both normal, the following step is further included:

[0077] If not, replace the pressure relief valve and / or the distribution valve of the air spring until it is detected that the pressure relief valve and the distribution valve of the air spring are normal.

[0078] Replace the pressure relief valve and / or the distribution valve of the air spring until both are normal, eliminate the interference of the abnormality of the pressure relief valve and / or the leftmost air spring on the judgment process, and judge again whether the pressure maintaining valve of the air spring is assembled in place.

[0079] See also Figure 8 As shown, an embodiment of the present invention further provides a device for determining whether a pressure-maintaining valve is properly assembled, comprising a vehicle controller, wherein the vehicle controller comprises: a response unit, a calculation unit and a determination unit.

[0080] The response unit is used to control the conduction of the pressure relief valve and the distribution valve of any air spring in response to the judgment instruction.

[0081] The calculation unit is used to obtain the height value of the air spring and calculate the height change value of the air spring within a preset first time period.

[0082] Specifically, a height sensor is provided at any air spring, and the height sensor can collect the height value of the corresponding air spring and output the collected height value to the vehicle controller, and then the vehicle controller can calculate the height change value of the air spring within a preset first time length.

[0083] The judging unit is used to judge whether the pressure-maintaining valve of the air spring is assembled in place according to a height change value of the air spring within a preset first time period.

[0084] Specifically, the judging unit is used to judge whether the pressure-maintaining valve of the air spring is assembled in place according to the height change value of the air spring within a preset first time period, including:

[0085] Determine whether a height change value of the air spring within a preset first time period is greater than a preset first height threshold.

[0086] If yes, determine whether the pressure-maintaining valve of the air spring is properly assembled; if no, check whether the pressure relief valve and the distribution valve of the air spring are both normal.

[0087] If so, it is determined that the pressure-maintaining valve of the air spring is not properly assembled.

[0088] Optionally, the preset first duration is not less than 15 seconds, and the preset first height threshold is not less than 5 mm. Figure 4As shown, taking the leftmost air spring as an example, the preset first time length is 15s, and the preset first height threshold is 5mm. When it is necessary to determine whether the pressure-maintaining valve of the leftmost air spring is in place, the vehicle controller responds to the judgment instruction to control the pressure relief valve and the distribution valve of the leftmost air spring to be turned on, obtain the height value of the leftmost air spring, and calculate the height change value of the leftmost air spring 15s after the pressure relief valve and the distribution valve of the leftmost air spring are turned on: assuming that the height change value is greater than 5mm, it can be determined that the pressure-maintaining valve of the leftmost air spring is in place; assuming that the height change value is not greater than 5mm, further detect whether the pressure relief valve and the distribution valve of the leftmost air spring are normal. If the pressure relief valve and the distribution valve of the leftmost air spring are normal, eliminate the interference of the abnormal pressure relief valve and / or the leftmost air spring on the judgment process, and finally determine that the pressure-maintaining valve of the leftmost air spring is not in place.

[0089] The device for judging whether the pressure-maintaining valve is in place in the embodiment of the present invention comprises a vehicle controller, wherein the response unit of the vehicle controller first responds to the judgment instruction to control the pressure relief valve and the distribution valve of any air spring to be turned on, and the calculation unit of the vehicle controller then obtains the height value of the air spring and calculates the height change value of the air spring within the preset first time length, and the judgment unit of the vehicle controller finally judges whether the pressure-maintaining valve of the air spring is in place according to the height change value of the air spring within the preset first time length. That is, the present invention can automatically judge whether the pressure-maintaining valve of the air spring is in place based on the vehicle controller, and there is no need to manually check the air pipe mark line to judge whether the pressure-maintaining valve is in place, which can avoid missed judgment as much as possible, and the judgment accuracy is high.

[0090] As an optional implementation, in an embodiment of the invention, the step of detecting whether the pressure relief valve and the distribution valve of the air spring are both normal includes:

[0091] The pressure relief valve is controlled to be closed and the distribution valve of the air spring is turned on.

[0092] Control the air pump to start or control the air tank to start, and the distribution valve of the air tank to be turned on.

[0093] The height value of the air spring is obtained, and the height change value of the air spring within a preset second time period is calculated.

[0094] Determine whether the height change value of the air spring within a preset second time period is greater than a preset second height threshold.

[0095] If yes, it is determined that the distribution valve of the air spring is normal; if no, it is determined that the distribution valve of the air spring is abnormal.

[0096] Optionally, the preset second time duration is 5s, and the preset second height threshold is 8mm. Figure 4 As shown, taking the leftmost air spring as an example, when it is necessary to detect whether the pressure relief valve and the distribution valve of the air spring are normal, the vehicle controller controls the pressure relief valve to close and the distribution valve of the leftmost air spring to be turned on, and then controls the air pump to be turned on or the air tank to be turned on and the distribution valve of the air tank to be turned on, to obtain the height value of the air spring, and calculate the height change value of the leftmost air spring 5s after the air pump is turned on or the air tank is controlled to be turned on and the distribution valve of the air tank is turned on. Assuming that the height change value is greater than 8mm (the height increase of the leftmost air spring is greater than 8mm), it can be determined that the distribution valve of the leftmost air spring is normal; otherwise, it can be determined that the distribution valve of the leftmost air spring is abnormal.

[0097] As an optional implementation, in an embodiment of the invention, if yes, after determining that the distribution valve of the air spring is normal, the method includes:

[0098] After the pressure relief valve is individually controlled to be turned on for a preset third time period, the pressure relief valve is controlled to be closed, and it is determined whether the pressure value in the pipeline is less than a preset pressure threshold;

[0099] If yes, the pressure relief valve is normal; if no, the pressure relief valve is abnormal.

[0100] Optionally, the preset third time duration may be 5 seconds, and the preset pressure threshold may be 2 bar. Figure 4 As shown, the pressure relief valve is controlled to be turned on for 5s and then closed. The pressure sensor P in the pipeline is used to determine whether the pressure value in the pipeline is less than 2 bar. If so, the pressure relief valve is normal; if not, the pressure relief valve is abnormal.

[0101] As an optional implementation, in an embodiment of the invention, see Figure 7 As shown, if so, after determining that the pressure-maintaining valve of the air spring is not properly assembled, the method includes:

[0102] Generate a fault alarm signal and send it to the instrument display for display.

[0103] When it is determined that the pressure-maintaining valve of the air spring is not properly assembled, a fault alarm signal is generated and sent to the instrument display for display, which can remind the inspection personnel that there is an assembly failure and prompt the inspection personnel to reassemble it.

[0104] As an optional implementation, in an embodiment of the invention, if not, after detecting whether the pressure relief valve and the distribution valve of the air spring are both normal, the method further includes:

[0105] If not, replace the pressure relief valve and / or the distribution valve of the air spring until it is detected that the pressure relief valve and the distribution valve of the air spring are normal.

[0106] Replace the pressure relief valve and / or the distribution valve of the air spring until both are normal, eliminate the interference of the abnormality of the pressure relief valve and / or the leftmost air spring on the judgment process, and judge again whether the pressure maintaining valve of the air spring is assembled in place.

[0107] An embodiment of the present invention further provides a vehicle, comprising a device for determining whether the aforementioned pressure-maintaining valve is properly assembled.

[0108] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0109] It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0110] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features of the present invention.

Claims

1. A method for determining whether a pressure-maintaining valve is properly assembled, characterized in that: The following steps are involved: In response to the judgment instruction, the pressure relief valve and the distribution valve of any air spring are controlled to be turned on; Obtaining a height value of the air spring, and calculating a height change value of the air spring within a preset first time period; Whether the pressure-maintaining valve of the air spring is assembled in place is determined according to a height change value of the air spring within a preset first time period.

2. The method for determining whether the pressure-maintaining valve is properly assembled according to claim 1, characterized in that: The step of judging whether the pressure-maintaining valve of the air spring is properly assembled according to the height change value of the air spring within a preset first time period comprises: Determine whether a height change value of the air spring within a preset first time period is greater than a preset first height threshold; If yes, determine whether the pressure-maintaining valve of the air spring is properly assembled; if no, check whether the pressure relief valve and the distribution valve of the air spring are both normal; If so, it is determined that the pressure-maintaining valve of the air spring is not properly assembled.

3. The method for determining whether the pressure-maintaining valve is properly assembled according to claim 2, characterized in that: The step of detecting whether the pressure relief valve and the distribution valve of the air spring are both normal comprises: Control the pressure relief valve to close and the distribution valve of the air spring to conduct; Control the air pump to start or control the air tank to start, and the distribution valve of the air tank to be turned on; Obtaining a height value of the air spring, and calculating a height change value of the air spring within a preset second time period; Determine whether a height change value of the air spring within a preset second time period is greater than a preset second height threshold; If yes, it is determined that the distribution valve of the air spring is normal; if no, it is determined that the distribution valve of the air spring is abnormal.

4. The method for determining whether the pressure-maintaining valve is properly assembled according to claim 3, characterized in that: If so, after the step of determining that the air spring distribution valve is normal, the method includes: After the pressure relief valve is individually controlled to be turned on for a preset third time period, the pressure relief valve is controlled to be closed, and it is determined whether the pressure value in the pipeline is less than a preset pressure threshold; If yes, the pressure relief valve is normal; if no, the pressure relief valve is abnormal.

5. The method for determining whether the pressure-maintaining valve is properly assembled according to claim 3, characterized in that: The step of determining whether the height change value of the air spring within the preset second time period is greater than the preset second height threshold comprises: When the preset second time duration is 5s, the preset second height threshold is not less than 8mm.

6. The method for determining whether the pressure-maintaining valve is properly assembled according to claim 2, characterized in that: The step of determining whether the height change value of the air spring within a preset first time period is greater than a preset first height threshold comprises: When the preset first time duration is 15s, the preset first height threshold is not less than 5mm.

7. The method for determining whether the pressure-maintaining valve is properly assembled according to claim 2, characterized in that: If so, after the step of determining that the pressure-maintaining valve of the air spring is not properly assembled, the following steps are included: Generate a fault alarm signal and send it to the instrument display for display.

8. The method for determining whether the pressure-maintaining valve is properly assembled according to claim 2, characterized in that: If not, after the step of detecting whether the pressure relief valve and the distribution valve of the air spring are both normal, the method further includes: If not, replace the pressure relief valve and / or the distribution valve of the air spring until it is detected that the pressure relief valve and the distribution valve of the air spring are normal.

9. A device for judging whether a pressure-maintaining valve is properly assembled, characterized in that: A vehicle controller is included, the vehicle controller comprising: A response unit, which is used to control the conduction of the pressure relief valve and the distribution valve of any air spring in response to the judgment instruction; A calculation unit, which is used to obtain the height value of the air spring and calculate the height change value of the air spring within a preset first time period; A judging unit is used to judge whether the pressure-maintaining valve of the air spring is assembled in place according to a height change value of the air spring within a preset first time period.

10. A vehicle, characterized in that: It includes a device for judging whether the pressure-maintaining valve as claimed in claim 9 is in place.

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