Air suspension air supply system and ECU assembly thereof

Abstract

The invention belongs to the technical field of passenger car air suspensions, and particularly relates to an air suspension air supply system and an ECU assembly thereof. The ECU assembly for the air suspension air supply system comprises an ECU bottom cover, a PCBA, an ECU shell, a coil and a motor connector which are integrally installed together, the PCBA is arranged between the ECU bottom cover and the ECU shell, the inner side of the ECU shell is connected with the PCBA through a first elastic clamping structure, and the outer side of the ECU shell is connected with the ECU bottom cover through a second elastic clamping structure; the ECU shell is provided with a connector male end and a plurality of coil mounting grooves; the coils are assembled in the coil mounting grooves in a one-to-one correspondence manner and are electrically connected with the PCBA; the motor connector is fixed to the ECU shell through a third elastic clamping structure, and the motor connector is electrically connected with the PCBA and used for being connected with an air supply unit motor. The air suspension air supply system adopts the ECU assembly for the air suspension air supply system. The device is high in integration level, small in size, light in weight, compact in structure and convenient to install and maintain, the wiring harness layout is optimized, and the manufacturing cost is saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of passenger car air suspension, and in particular relates to an air suspension air supply system and an ECU assembly thereof. Background Art

[0002] As the automotive industry evolves towards intelligent and comfortable driving, passenger car air suspension systems have become a key technology for enhancing the overall vehicle's ride quality. The air suspension air supply system is the core functional module for dynamic vehicle body adjustment. It primarily consists of an air supply unit (compressor, dryer), a gas distribution device, a control unit (ECU), an air reservoir, air springs, and shock absorbers. This system precisely controls the inflation and deflation of the air springs based on road conditions and driving regimes, dynamically adjusting vehicle height and stiffness. This significantly improves vehicle ride comfort, maneuverability, and high-speed stability on complex roads.

[0003] The ECU of a traditional air suspension air supply system generally adopts an independent design architecture. As an independent physical component, this type of ECU needs to find a suitable installation space on the vehicle. It also needs to be connected to the compressor, air spring, CDC shock absorber, and sensing elements such as the height sensor and acceleration sensor of the air supply unit through multiple sets of wiring harnesses. At the same time, it also needs to exchange signals with the vehicle control system through the CAN wiring harness. The installation is cumbersome, the wiring harness is complex, and the cost is high. Summary of the Invention

[0004] The present invention provides an air suspension air supply system and an ECU assembly thereof, so as to solve the technical problems of the traditional air suspension air supply system such as cumbersome installation, complex wiring harness and high cost.

[0005] To solve the above problems, the present invention provides an ECU assembly for an air suspension air supply system adopting the following technical solutions: An ECU assembly for an air suspension air supply system, comprising an ECU bottom cover, a PCBA, an ECU housing, a coil, and a motor connector that are integrated together; The PCBA is arranged between the ECU bottom cover and the ECU housing, and the inner side of the ECU housing is connected to the PCBA via a first elastic snap-fit structure; the outer side of the ECU housing is connected to the ECU bottom cover via a second elastic snap-fit structure; The ECU housing is provided with a connector male terminal and multiple coil mounting slots; The coils are assembled one by one in the coil mounting grooves and electrically connected to the PCBA; the motor connector is fixed to the ECU housing through a third elastic snap-fit structure, and the motor connector is electrically connected to the PCBA and is used to connect the air supply unit motor. The ECU assembly for the air suspension air supply system offers the following benefits: The ECU undercover, PCBA, ECU housing, coil, and motor connector are integrated into a compact structure with minimal size and weight. This allows for direct integration into the air supply unit, reducing overall vehicle layout complexity. The PCBA is secured via a first elastic snap-fit structure on the inside of the ECU housing, while the ECU housing and ECU undercover are connected via a second elastic snap-fit structure on the outside, creating a dual-layer snap-fit system. This ensures insulation isolation between the PCBA's electronic components and the ECU housing, while also enabling quick assembly through physical snap-fitting, requiring no additional screws or tools, requiring only manual pressure, thus reducing manufacturing costs. The male connector terminals are used for external electrical connections, reducing the number and length of wiring harnesses and optimizing signal transmission paths. The coil mounting slots enable standardized coil assembly, and the motor connector is secured via a third elastic snap-fit structure, forming a complete signal chain from power input to control center to actuator drive. Each module has a clearly defined division of labor, facilitating subsequent maintenance and replacement.

[0006] Furthermore, the first elastic clamping structure includes a plurality of notched card slots arranged around the PCBA and a first elastic clamping arm arranged on the inner side of the ECU housing and corresponding to the notched card slots one by one. The arm body of the first elastic clamping arm is located in the notched card slot and contacts the PCBA limit. The hook of the first elastic clamping arm passes over the notched card slot and contacts the PCBA support upward. The inner side of the ECU housing is also provided with a plurality of limit platforms distributed around the PCBA above the PCBA. After the first elastic clamping arm is engaged with the corresponding notched card slot, the limit platform contacts the PCBA limit downward.

[0007] Beneficial Effects: The first elastic arm engages the notched slot, and the hook's support against the PCBA mechanically locks the PCBA in its circumferential direction. After engagement, the stopper presses down on the PCBA, preventing it from shaking. This ensures the PCBA's stability in vibrating environments and prevents control signal interruptions caused by poor contact. The first elastic arm corresponds to the notched slot, requiring specific alignment during installation to prevent reverse installation or misalignment of the PCBA, improving assembly accuracy.

[0008] Furthermore, the second elastic snap-fit structure includes a plurality of elastic snap-fit plates arranged around the ECU bottom cover and a first snap-fit protrusion arranged on the outside of the ECU shell and corresponding to the elastic snap-fit plates one by one; the elastic snap-fit plates are provided with a first snap-fit groove that snaps into engagement with the first snap-fit protrusion; the ECU shell is buckled into the ECU bottom cover and assembled together through the snap-fitting of the first snap-fit protrusion and the elastic snap-fit plates.

[0009] Beneficial Effects: The elastic retaining plate on the ECU bottom cover has a certain degree of deformation. When the ECU housing is buckled down, the first engaging protrusion squeezes the elastic retaining plate into the first engaging groove, leveraging material rebound to achieve a tight engagement. This allows for a tight fit within a certain tolerance range, easing the stringent requirements for component machining precision. Compared to traditional screw fastening, this snap-fit structure can be assembled and disassembled by hand or with simple tools, making installation and subsequent maintenance more convenient.

[0010] Furthermore, the ECU housing is provided with a connector positioning groove for installing the motor connector, and two openings arranged opposite to each other are opened in the circumferential direction of the connector positioning groove; the third elastic snap-fit structure includes a second elastic snap-fit arm arranged at the corresponding opening and a second snap-fit protrusion arranged on the motor connector and corresponding one-to-one with the second elastic snap-fit arm, and the second elastic snap-fit arm is provided with a second snap-fit groove for snapping with the second snap-fit protrusion.

[0011] Beneficial Effects: The symmetrical opening design of the connector positioning slot, combined with the second elastic latching arms on both sides, ensures uniform clamping force on the motor connector during installation, preventing poor contact between terminals due to misalignment. The engagement of the second latching protrusion with the second latching slot creates a horizontal lock, preventing the motor connector from loosening due to vehicle vibration during driving and ensuring stable transmission of the air supply unit motor drive signal.

[0012] Furthermore, the bottom of the coil mounting groove is provided with a first positioning hole and a second positioning hole for the positioning pin and the skeleton on the coil to pass through respectively, and the hole walls of the first positioning hole and the second positioning hole are respectively provided with a plurality of fixing protrusions for tightening the positioning pin and the skeleton. The bottom of the coil mounting groove also has two elastic support arms symmetrically arranged on both sides of the first positioning hole and the second positioning hole. The elastic support arms are in contact with the coil support to compensate for the coil assembly error.

[0013] Beneficial Effects: The first and second positioning holes secure the coil's locating pin and frame, respectively. The fixing protrusions on the hole walls create an interference fit, tightening the coil and securing it. The elastic support arms compensate for height errors during coil assembly through elastic deformation, preventing electrical contact failure caused by assembly errors. Furthermore, the flexible support of the elastic support arms absorbs vibration energy during vehicle operation, reducing the impact between the coil and the ECU housing and extending the coil's service life.

[0014] Furthermore, the joints between the ECU housing and the ECU bottom cover, and the joints between the male PIN pins of the connector and the ECU housing are all glue-filled.

[0015] Beneficial effects: Glue filling at the joint between the ECU housing and the ECU bottom cover can prevent moisture and dust from invading the internal electronic components; glue filling at the joint between the male PIN pin of the connector and the ECU housing can prevent the gap between the pin and the ECU housing from becoming a leakage channel, improving the sealing and improving the IP protection level.

[0016] Furthermore, grounding springs are connected between the PCBA and the corresponding coil, and between the PCBA and the ECU housing.

[0017] Beneficial Effects: The grounding spring between the PCBA and the coil quickly conducts away static electricity generated when the coil is energized, preventing static buildup and damage to electronic components on the PCBA. The grounding spring between the PCBA and the ECU housing directs static electricity induced by the ECU housing into the vehicle's grounding system, forming a comprehensive ESD protection system and improving the system's electromagnetic compatibility. The grounding spring ensures that metal components, including the PCBA, coil, and housing, are at the same electrical potential, preventing arcing caused by potential differences between components, reducing the risk of electromagnetic interference and extending the service life of the entire ECU assembly.

[0018] Furthermore, the ECU housing is provided with a plurality of heat dissipation holes, and / or the ECU bottom cover is coated with a heat-conducting material.

[0019] Beneficial Effects: The heat dissipation holes in the ECU housing remove heat generated by the coils and electronic components on the PCBA through air convection. The thermally conductive material on the ECU bottom cover dissipates heat from the PCBA, reducing the impact of heat on the electronic components. This dual heat dissipation path effectively reduces the temperature of core components, preventing performance degradation and shortened lifespan of electronic components due to overheating.

[0020] Furthermore, a threaded part for detachably connecting to the air supply valve body is embedded in the ECU housing.

[0021] Beneficial effect: The threaded parts are directly embedded in the shell. When connecting to the air supply valve body, only the bolts need to be passed through the screw holes of the valve body and screwed into the embedded threaded parts. No additional nuts are required, which saves installation space and reduces component costs and assembly complexity.

[0022] The technical solution of an air suspension air supply system provided by the present invention is: An air suspension air supply system adopts an ECU assembly for an air suspension air supply system according to any one of the above technical solutions.

[0023] Beneficial effects of the air suspension air supply system: The air suspension air supply system integrated with the above-mentioned ECU assembly has the advantages of high reliability (multiple seals, vibration-resistant design), high adaptability (modular hardware and configurable software), and high heat dissipation efficiency. It reduces the overall installation complexity, optimizes the wiring harness layout, and saves manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of an ECU assembly for an air suspension air supply system of the present invention; Figure 2 for Figure 1 Schematic diagram of the decomposition; Figure 3 for Figure 1 A top view of Figure 4 for Figure 3 AA section view; Figure 5 This is a first-person perspective diagram of the ECU housing; Figure 6 This is a second perspective diagram of the ECU housing; Figure 7 This is a structural diagram of the ECU bottom cover; Figure 8 It is a structural diagram of the coil; Figure 9 It is a structural diagram of the motor connector; Figure 10 The figure is a control schematic diagram of an ECU assembly for an air suspension air supply system according to the present invention.

[0025] Description of reference numerals: 1. ECU bottom cover; 11. Elastic card plate; 12. First card slot; 2. PCBA; 21. Notch card slot; 3. ECU housing; 30. Threaded member; 31. Connector male end; 32. Connector positioning slot; 33. Coil mounting slot; 331. First positioning hole; 332. Second positioning hole; 333. Elastic support arm; 334. Fixing protrusion; 34. First elastic clamping arm; 35. Positioning platform; 36. First clamping protrusion; 37. Second elastic clamping arm; 371. Second clamping slot; 38. Heat dissipation hole; 39. Mounting hole; 4. Coil; 41. Positioning pin; 42. Frame; 5. Motor connector; 51. Second snap-fit protrusion; 6. Sealing ring; 7. Grounding spring. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0027] The principles and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0028] An embodiment of an ECU assembly for an air suspension air supply system provided by the present invention: The ECU assembly for the air suspension air supply system is used in the air suspension air supply system of passenger cars. Its core function is to control the operation of the air supply unit, realize the inflation and deflation of the air spring, and is compatible with the signal processing and drive of components such as the vehicle height sensor, acceleration sensor, and CDC shock absorber.

[0029] like Figure 1 、 Figure 2 and Figure 3 As shown, the ECU assembly for the air suspension air supply system of the present invention includes an ECU bottom cover 1, a PCBA 2, an ECU housing 3, a coil 4 and a motor connector 5 that are integrated and installed together.

[0030] The ECU bottom cover 1 and the ECU housing 3 are both integrally formed components with high overall strength. Figure 4 As shown, PCBA2 is arranged between the ECU bottom cover 1 and the ECU housing 3. The inner side of the ECU housing 3 is connected to the PCBA2 through a first elastic snap-fit structure; the outer side of the ECU housing 3 is connected to the ECU bottom cover 1 through a second elastic snap-fit structure; and the motor connector 5 is fixed to the ECU housing 3 through a third elastic snap-fit structure.

[0031] Specifically, in this embodiment, Figure 2 and Figure 4 As shown, the first elastic clamping structure includes a plurality of notched slots 21 arranged around the PCBA2 and a first elastic clamping arm 34 arranged on the inner side of the ECU housing 3 and corresponding to the notched slots 21. The arm body of the first elastic clamping arm 34 is located in the notched slots 21 and contacts the PCBA2 limit position. The hook of the first elastic clamping arm 34 passes over the notched slots 21 and contacts the PCBA2 support upward, limiting the horizontal shaking of the PCBA2. Figure 6 As shown, the inner side of the ECU housing 3 is provided with a plurality of limit platforms 35 distributed around the PCBA2 above the PCBA2. The limit platforms 35 are located beside the corresponding first elastic clamping arm 34. When the first elastic clamping arm 34 is engaged with the corresponding notch clamping slot 21, the limit platforms 35 are downwardly contacted with the PCBA2 to limit the PCBA2 and cooperate with the clamping hook to limit the PCBA2 from shaking in the up and down directions, thereby ensuring the stability of the PCBA2 in a vibration environment and avoiding the interruption of the control signal due to poor contact.

[0032] like Figure 1 and Figure 7As shown, the second elastic snap-fit structure includes multiple elastic clips 11 arranged around the ECU bottom cover 1 and first snap-fit protrusions 36 disposed on the outside of the ECU housing 3, corresponding one-to-one with the elastic clips 11. The elastic clips 11 are provided with first snap-fit grooves 12 that snap-fit with the first snap-fit protrusions 36. During installation, the ECU housing 3 is buckled downward into the ECU bottom cover 1. The first snap-fit protrusions 36 press against the elastic clips 11 and enter the first snap-fit grooves 12, completing the assembly with the elastic clips 11. Compared to the traditional method of connecting with nuts, the present invention assembles the ECU housing 3 with both the PCBA 2 and the ECU bottom cover 1 through the elastic snap-fit structure, forming a double-layer snap-fit system. This not only ensures the insulation isolation of the electronic components on the PCBA 2 from the ECU housing 3, but also enables quick assembly through physical snap-fitting, requiring no additional screws or tools, requiring only manual pressure, thus reducing manufacturing costs. In addition, to prevent moisture, dust, etc. from entering the ECU housing 3 and damaging the electronic components, thereby affecting the service life of the electronic components, glue is poured at the junction of the ECU housing 3 and the ECU bottom cover 1 to ensure sealing between the two.

[0033] like Figure 5 As shown, the ECU housing 3 is provided with a connector male end 31, a connector positioning slot 32, a plurality of coil mounting slots 33, a plurality of heat dissipation holes 38 and a plurality of placement holes 39. Among them, the connector male end 31 is universal and does not require a customized connector female end. The corresponding model of the plug-in female end can be used. The joint between the connector male end PIN pin and the ECU housing 3 is also glued to reduce leakage after the ECU assembly is installed, and the sealing is good. The connector male end 31 is the only outlet for all external connections. Different PIN pins are defined to define the corresponding wiring harness female ends for connecting various components. The wiring harnesses of components such as the height sensor, acceleration sensor, air spring solenoid valve, and CDC shock absorber are all equipped with connector female ends, and their pin definitions correspond one-to-one with the PIN pins of the ECU connector male end 31. By setting the plug-in male end 31, the layout of the wiring harness can be optimized and the number and length of the wiring harness can be reduced.

[0034] like Figure 1 As shown, the coils 4 are mounted in the coil mounting slots 33 in a one-to-one correspondence and are electrically connected to the PCBA 2. Figure 5 and Figure 8As shown, the bottom of the coil mounting groove 33 is provided with a first positioning hole 331 and a second positioning hole 332 for the positioning pin 41 and the skeleton 42 on the coil 4 to pass through respectively, and the hole walls of the first positioning hole 331 and the second positioning hole 332 are respectively provided with a plurality of fixing protrusions 334 for tightening the positioning pin 41 and the skeleton 42. The bottom of the coil mounting groove 33 also has two elastic support arms 333 symmetrically arranged on both sides of the first positioning hole 331 and the second positioning hole 332. The elastic support arms 333 are arc-shaped and are in contact with the coil 4 to play the role of elastic vibration reduction and support, thereby compensating for the tolerance of the coil 4 after assembly.

[0035] like Figure 5 As shown, the multiple placement holes 39 ensure redundant space for electronic components during iterative replacement of the PCBA 2. The multiple heat dissipation holes 38 allow heat generated by the coil 4 and the electronic components on the PCBA 2 to be discharged to the outside through the heat dissipation holes 38 and the air supply unit during operation, reducing heat losses and extending the life of the ECU assembly.

[0036] like Figure 5 As shown, the ECU housing 3 is embedded with four threaded members 30 arranged in a rectangular pattern for connection to the air supply valve body. These metal members 30 have internally threaded holes, facilitating assembly and disassembly of the ECU assembly. They avoid the space constraints and installation difficulties associated with traditional bolt and nut installation, while also reducing costs. A sealing ring 6 is also located on the top periphery of the ECU housing 3 to provide a seal between the ECU housing 3 and the air supply valve body.

[0037] like Figure 5 As shown, the connector positioning groove 32 is provided with two openings arranged opposite to each other on the circumference, such as Figure 9 As shown, the third elastic clamping structure includes a second elastic clamping arm 37 provided at the corresponding opening and a second clamping protrusion 51 provided on the motor connector 5 and corresponding to the second elastic clamping arm 37. Figure 5 As shown, the second elastic latch arm 37 is provided with a second latching groove 371 that engages with the second latching protrusion 51. During installation, the motor connector 5 is inserted into the connector positioning groove 32, so that the two second latching protrusions 51 on the motor connector 5 snap into the corresponding second latching grooves 371. The motor connector 5 is electrically connected to the PCBA 2 and ultimately to the air supply unit motor.

[0038] In this embodiment, the ECU bottom cover 1 is coated with a thermally conductive material, in the form of silicone grease, which dissipates heat generated by the PCBA 2. This, combined with the aforementioned heat dissipation holes 38, forms a dual heat dissipation mechanism, reducing the impact of heat on electronic components and extending the life of the ECU assembly. Of course, the thermally conductive material is not limited to the aforementioned silicone grease. In other embodiments, graphite sheets, phase change materials, and other materials may also be used, as long as they provide good heat dissipation.

[0039] like Figure 4 As shown, grounding springs 7 are connected between the PCBA2 and the corresponding coil 4, and between the PCBA2 and the ECU housing 3. During actual installation, one of the grounding springs 7 is in close contact with the metal part of the coil 4 through elastic pressure, ensuring that the static electricity generated by the coil 4 can be quickly transmitted to the grounding spring 7; the other grounding spring 7 is fixed to the conductive area of the ECU housing 3. Both grounding springs 7 are connected to the PCBA2, and the ECU housing 3 itself is grounded through the vehicle body, forming a complete electrostatic discharge circuit, thereby extending the life of the ECU assembly.

[0040] The ECU assembly for the air suspension air supply system of the present invention can realize the control of the ECU assembly by the chassis domain control through the adjustment of the software architecture, and can also control the ECU assembly by connecting the entire vehicle through the CAN line, thereby meeting the needs of different users and having good flexibility in use.

[0041] The ECU assembly for the air suspension air supply system provided by the present invention has high integration, small size and light weight. It is installed on the air supply unit. When the male terminal 31 of the connector is energized, the air supply unit can be controlled by the control logic to perform pressurization and exhaust to inflate and deflate the air spring. Figure 10 As shown, it can also drive the multi-chamber air spring solenoid valve, CDC shock absorber solenoid valve, acceleration sensor, height sensor, etc. of the entire vehicle to operate. It should be noted that the air springs of the air suspension include single-chamber air springs, dual-chamber air springs, and multi-chamber air springs, and the CDC shock absorbers include single-valve CDC shock absorbers and dual-valve CDC shock absorbers. The ECU assembly for the air suspension air supply system of the present invention can adjust the hardware layout and software architecture of the ECU assembly according to the requirements of the entire vehicle, realize the combined control of different models of air suspension components, and ultimately realize vehicle body monitoring, meet the vehicle body height requirements required for different operating conditions, meet the needs of users in different scenarios, and improve vehicle comfort.

[0042] Embodiments of the air suspension air supply system of the present invention: The air suspension air supply system adopts the ECU assembly for the air suspension air supply system in the above embodiment, which will not be described in detail here.

[0043] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "inside", "outside" and other terms indicating orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings of this specification. They are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0044] In the description of this specification, “a plurality of” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

[0045] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will readily appreciate that various modifications, readjustments, and substitutions are possible without departing from the scope of the present invention. It is not necessary and impossible to provide an exhaustive list of all embodiments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be encompassed by the scope of the claims.

Claims

1. An ECU assembly for an air suspension air supply system, characterized in that: Includes the ECU bottom cover, PCBA, ECU housing, coil and motor connector that are integrated together; The PCBA is arranged between the ECU bottom cover and the ECU housing, and the inner side of the ECU housing is connected to the PCBA via a first elastic snap-fit structure; the outer side of the ECU housing is connected to the ECU bottom cover via a second elastic snap-fit structure; The ECU housing is provided with a connector male terminal and multiple coil mounting slots; The coils are assembled one by one in the coil mounting grooves and electrically connected to the PCBA; the motor connector is fixed to the ECU housing through a third elastic snap-fit structure, and the motor connector is electrically connected to the PCBA and is used to connect the air supply unit motor.

2. The ECU assembly for an air suspension air supply system according to claim 1, characterized in that: The first elastic clamping structure includes a plurality of notched card slots arranged around the PCBA and a first elastic clamping arm arranged on the inner side of the ECU housing and corresponding to the notched card slots one by one. The arm body of the first elastic clamping arm is located in the notched card slot and abuts against the PCBA limit. The hook of the first elastic clamping arm passes over the notched card slot and abuts against the PCBA support upward. The inner side of the ECU housing is also provided with a plurality of limit platforms distributed around the PCBA above the PCBA. After the first elastic clamping arm is engaged with the corresponding notched card slot, the limit platforms abut against the PCBA limit downward.

3. The ECU assembly for an air suspension air supply system according to claim 1, characterized in that: The second elastic snap-fit structure includes a plurality of elastic snap-fit plates arranged around the ECU bottom cover and a first snap-fit protrusion arranged on the outside of the ECU shell and corresponding to the elastic snap-fit plates one by one; the elastic snap-fit plates are provided with a first snap-fit groove that snaps into engagement with the first snap-fit protrusion; the ECU shell is buckled into the ECU bottom cover and assembled together through the snap-fitting of the first snap-fit protrusion and the elastic snap-fit plates.

4. The ECU assembly for an air suspension air supply system according to claim 1, characterized in that: The ECU housing is provided with a connector positioning groove for installing the motor connector, and two openings arranged opposite to each other are opened in the circumferential direction of the connector positioning groove; the third elastic clamping structure includes a second elastic clamping arm arranged at the corresponding opening and a second clamping protrusion arranged on the motor connector and corresponding to the second elastic clamping arm one by one, and the second elastic clamping arm is provided with a second clamping groove that is clamped with the second clamping protrusion.

5. An ECU assembly for an air suspension air supply system according to any one of claims 1 to 4, characterized in that: The bottom of the coil mounting groove is provided with a first positioning hole and a second positioning hole for the positioning pin and the skeleton on the coil to pass through respectively. The hole walls of the first positioning hole and the second positioning hole are respectively provided with a plurality of fixing protrusions for tightening the positioning pin and the skeleton. The bottom of the coil mounting groove also has two elastic support arms symmetrically arranged on both sides of the first positioning hole and the second positioning hole. The elastic support arms are in contact with the coil support to compensate for the coil assembly error.

6. An ECU assembly for an air suspension air supply system according to any one of claims 1 to 4, characterized in that: The joints between the ECU housing and the ECU bottom cover, and the joints between the male PIN pins of the connector and the ECU housing are all filled with glue.

7. An ECU assembly for an air suspension air supply system according to any one of claims 1 to 4, characterized in that: Grounding springs are connected between the PCBA and the corresponding coil, and between the PCBA and the ECU housing.

8. An ECU assembly for an air suspension air supply system according to any one of claims 1 to 4, characterized in that: The ECU housing is provided with a plurality of heat dissipation holes, and / or the ECU bottom cover is coated with a heat-conducting material.

9. An ECU assembly for an air suspension air supply system according to any one of claims 1 to 4, characterized in that: The ECU housing is embedded with a threaded part for detachably connecting with the air supply valve body.

10. An air suspension air supply system, characterized in that: An ECU assembly for an air suspension air supply system comprising the embodiment of any one of claims 1 to 9.

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