Air supply system for air suspension

Abstract

The application discloses a kind of air supply systems of air suspension, including compression pump assembly, for output high-pressure gas;One end of finned radiating pipe is connected with the high-pressure gas output end of compression pump assembly by first pipeline, and the other end of finned radiating pipe is connected with dryer by second pipeline and is connected with pressure limiting valve by third pipeline respectively;One end of pressure limiting valve is connected with second pipeline by fifth pipeline, pneumatic control valve is installed on fifth pipeline, and second pipeline is sequentially connected with air valve, first switch valve and second switch valve by sixth pipeline, air valve is connected with corresponding air spring respectively;Second switch valve is connected with compression pump assembly by seventh pipeline, and pipeline is connected with gas holder by eighth pipeline.The application is simple in structure, can realize the adjustable of safety pressure, and can control air suspension air supply unit inflation according to the motion state and road surface condition of automobile, realize air suspension system regulating function.

Description

Technical Field

[0001] This invention relates to the field of automotive air suspension, specifically to an air supply system for air suspension. Background Technology

[0002] As a crucial component of an automotive active suspension system, air suspension primarily consists of an air supply unit, air springs, damping devices, a stabilizer, a height valve, a guide and force transmission mechanism, an air tank, and piping. It can adjust the suspension stiffness and damping in real time according to the vehicle's motion and road conditions, ensuring the suspension system is in optimal damping mode and providing excellent comfort under various road conditions. With increasing demands for ride comfort and advancements in suspension technology, air suspension is widely used in large buses, heavy-duty trucks, special-purpose vehicles, and high-end small cars.

[0003] As the core component of the air suspension system, the air supply system compresses air and fills the air springs, providing the power source for adjusting the stiffness and damping of the air suspension. The distribution valve assembly in the air supply system needs to be able to dynamically control the inflow and outflow of gas, adjust the stiffness and length of the air springs, and control the inflation and deflation of the air suspension supply unit to realize the adjustment function of the air suspension system. However, existing air supply systems have a large number of control valves, cumbersome connections, and non-adjustable safety pressure. Summary of the Invention

[0004] This invention provides an air supply system for an air suspension system. It has a simple structure, can achieve adjustable safety pressure, and can control the inflation and deflation of the air supply unit according to the vehicle's motion state and road conditions, thereby realizing the adjustment function of the air suspension system.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an air supply system for an air suspension, comprising a compressor pump assembly for outputting high-pressure gas; a finned heat sink tube, one end of which is connected to the high-pressure gas output end of the compressor pump assembly via a first pipeline, the other end of which is connected to a dryer via a second pipeline and to a pressure relief valve via a third pipeline, and the pressure relief valve is also connected to the air inlet of the compressor pump assembly via a fourth pipeline;

[0006] One end of the pressure relief valve is connected to the second pipeline via the fifth pipeline. A pneumatic control valve is installed on the fifth pipeline. The second pipeline is connected to the first air valve, the second air valve, the third air valve, the fourth air valve, the first switching valve, and the second switching valve in sequence via the sixth pipeline. The first air valve, the second air valve, the third air valve, and the fourth air valve are respectively connected to the left front wheel air spring, the left rear wheel air spring, the right front wheel air spring, and the right rear wheel air spring.

[0007] The second switching valve is connected to the compression pump assembly via the seventh pipeline, and the pipeline between the first switching valve and the second switching valve is connected to the gas storage tank via the eighth pipeline.

[0008] Preferably, the compression pump assembly includes a two-stage pump, with a compression chamber at each end. A compression piston is installed in each compression chamber. The compression piston is driven by a motor. The compression chambers at both ends of the compression pump assembly are connected by a ninth pipeline, and the eighth pipeline is connected to the ninth pipeline.

[0009] Preferably, the air inlet of the compressor assembly is connected to the air filter via a tenth pipeline.

[0010] Preferably, pressure sensors are installed in the left front wheel air spring, left rear wheel air spring, right front wheel air spring, right rear wheel air spring, and air tank.

[0011] Preferably, a one-way throttle valve is also installed on the second pipeline.

[0012] Preferably, a tire inflation valve is also included, which is disposed on the eleventh pipe between the tire and the finned heat dissipation tube.

[0013] Preferably, a flow control valve is installed on the third pipeline.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The air supply system has a simple circuit and uses fewer control valves, allowing for the integration and miniaturization of multiple control valves. It features a pressure relief valve with adjustable safety pressure settings in multiple levels, effectively preventing excessive pressure caused by air circuit blockage. The control valves are controlled by a unified ECU, which can control the inflation and deflation of the air suspension air supply unit according to the vehicle's movement and road conditions, thereby realizing the air suspension system adjustment function. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the gas tank filling circuit of the present invention;

[0017] Figure 2 This is a schematic diagram of the circuit where the gas storage tank is not running and the compressor pressurizes the air spring.

[0018] Figure 3 This is a schematic diagram of the air spring pressure relief mode circuit of the present invention;

[0019] Figure 4 This is a schematic diagram of the circuit where the compressor pump is not running and the air tank directly fills the air spring.

[0020] Figure 5This is a schematic diagram of the rapid voltage build-up mode circuit of the present invention;

[0021] Figure 6 This is a schematic diagram of the circuit after adding the inflation function in this invention.

[0022] Figure label:

[0023] PA, compressor pump assembly; FRT, finned heat sink; A3, first line; B1, second line; B2, third line; DA, dryer; ASV, pressure relief valve; C2, fourth line; P, air inlet; C1, fifth line; ACV, pneumatic control valve; D1, sixth line; AV1, first air valve; AV2, second air valve; AV3, third air valve; AV4, fourth air valve; SV-2, first switching valve; SV-1, second switching valve; LF-S, left front wheel air spring; LR-S, left rear wheel air spring; FR-S, right front wheel air spring; RR-S, right rear wheel air spring; D3, seventh line; C3, eighth line; AT, air tank; A2, ninth line; A1, tenth line; AC, air filter; CA, one-way throttle valve; IV, tire inflation valve; A4, eleventh line; FV, flow control valve. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0025] like Figure 1-6 As shown, the present invention addresses the problems of unadjustable safety pressure, easy blockage of air passages leading to excessively high pressure, and overly complex air supply systems in existing air supply systems by providing the following technical solution: an air supply system for an air suspension, comprising a compressor pump assembly PA for outputting high-pressure gas; a finned heat sink FRT, one end of which is connected to the high-pressure gas output end of the compressor pump assembly PA via a first pipeline A3, and the other end of the finned heat sink FRT is connected to a dryer DA via a second pipeline B1 and to a pressure relief valve ASV via a third pipeline B2, and the pressure relief valve ASV is also connected to the air inlet P of the compressor pump assembly PA via a fourth pipeline C2;

[0026] One end of the pressure relief valve ASV is connected to the second pipeline B1 through the fifth pipeline C1. A pneumatic control valve ACV is installed on the fifth pipeline C1. The second pipeline B1 is connected to the first air valve AV1, the second air valve AV2, the third air valve AV3, the fourth air valve AV4, the first switching valve SV-2, and the second switching valve SV-1 in sequence through the sixth pipeline D1. The first air valve AV1, the second air valve AV2, the third air valve AV3, and the fourth air valve AV4 are respectively connected to the left front wheel air spring LF-S, the left rear wheel air spring LR-S, the right front wheel air spring FR-S, and the right rear wheel air spring RR-S.

[0027] The second switching valve SV-1 is connected to the compression pump assembly PA via the seventh pipeline D3, and the pipeline between the first switching valve SV-2 and the second switching valve SV-1 is connected to the gas storage tank AT via the eighth pipeline C3.

[0028] Specifically, in inflation mode: when the vehicle speed is higher than 30km / h, the air suspension air supply unit motor runs. The system first connects the first switching valve SV-2, then connects the compressor pump assembly PA and the air tank AT. Air enters the compressor pump assembly PA from the air inlet P, passes through the first pipeline A3 and the finned heat sink FRT, passes through the second pipeline B1 and the dryer DA, then passes through the sixth pipeline D1 and the first switching valve SV-2, and finally enters the air tank AT through the eighth pipeline C3 to fill the air tank AT. When the pressure in the air tank AT is at least a certain value higher than the pressure in the air spring to be adjusted, the motor does not run, and the air spring is directly pressurized by the air tank AT.

[0029] Raising the vehicle body: The first switching valve SV-2, first air valve AV1, second air valve AV2, third air valve AV3, and fourth air valve AV4 are energized. Compressed gas in the air tank AT is pressurized through the eighth pipeline C3, via the first switching valve SV-2, and finally through the first air valve AV1, second air valve AV2, third air valve AV3, and fourth air valve AV4, raising the vehicle body. The air tank AT is preferentially used during adjustments when the vehicle is stationary or traveling at low speeds to improve the vehicle's acoustic system; when the air tank AT pressure is low... When a certain value is reached, the air tank AT is not connected, and the motor operates: the first air valve AV1, the second air valve AV2, the third air valve AV3, and the fourth air valve AV4 are energized. Air enters the compressor pump assembly PA from the air inlet P, passes through the tenth pipe A1, the ninth pipe A2, and the first pipe A3, and then enters the finned heat sink FRT. It then passes through the second pipe B1 and the dryer DA, and through the sixth pipe D1 and the first air valve AV1, the second air valve AV2, the third air valve AV3, and the fourth air valve AV4 to pressurize the air spring, thus raising the vehicle body.

[0030] Quick Start Mode: When rapid pressure build-up is required, the air tank AT is activated, and the motor operates. The second switching valve SV-1, the first air valve AV1, the second air valve AV2, the third air valve AV3, and the fourth air valve AV4 are energized. Compressed air from the air tank AT is introduced into the second-stage compression chamber via the eighth pipeline C3, the second switching valve SV-1, the seventh pipeline D3, and the ninth pipeline A2. It then passes through the first pipeline A3, the finned heat sink FRT, the second pipeline B1, the dryer DA, and the sixth pipeline D1, as well as the first air valve AV1, the second air valve AV2, the third air valve AV3, and the fourth air valve AV4 to pressurize the air spring, raising the vehicle body. This mode can quickly build up pressure when needed. This function uses the air tank pressure.

[0031] Exhaust Mode: When the pneumatic control valve ACV, first air valve AV1, second air valve AV2, third air valve AV3, and fourth air valve AV4 are energized, the gas in the air spring flows through these valves via the sixth pipe D1, then through the dryer DA, then through the second and third pipes B1 and B2, then through the flow control valve FV and the pressure relief valve ASV, finally exiting through the fourth pipe C2, lowering the vehicle body. The gas then flows through the sixth pipe D1 and the fifth pipe C1, passing through the pneumatic control valve ACV. The pressure applied to the control interface of the pressure relief valve ASV switches it to the open position. The pressure relief valve ASV has multiple adjustable safety pressure settings, effectively preventing excessive pressure due to airway blockage. The flow control valve FV can also be adjusted in multiple stages during the exhaust phase, enhancing the driving experience.

[0032] In this embodiment, the compression pump assembly PA can be a two-stage pump, with compression chambers at both ends. A compression piston is installed in each compression chamber, and the compression piston is driven by a motor. The compression chambers at both ends of the compression pump assembly PA are connected by a ninth pipeline A2, and the eighth pipeline C3 is connected to the ninth pipeline A2.

[0033] Specifically, the compressor pump assembly PA includes a motor and a two-stage compressor pump, with the motor's main shaft inserted into the two-stage compressor pump. The two-stage compressor pump has an internal running chamber and a first chamber and a second chamber respectively located on either side of the running chamber. A first compression chamber and a second compression chamber are located at opposite ends of the running chamber. A first piston is movably mounted in the first compression chamber, and a second piston is mounted in the second compression chamber. The first and second pistons are driven by the motor's main shaft to move axially in the same direction. The first and second compression chambers are connected to the first chamber via a first check valve and a second check valve, respectively. The second chamber is connected to the second compression chamber. The two-stage compressor pump has an exhaust port connected to the second chamber, and an exhaust cooling pipe is connected to the exhaust port. The compressor pump body also has a secondary air inlet connected to the first chamber.

[0034] The motor serves as the output power source, and an eccentric wheel can be mounted on its main shaft. As a specific embodiment of the motor driving the movement of the first and second pistons, one end of the second piston is inserted into one end of the first piston, and this inserted end is connected to the eccentric wheel. One end of the first piston is connected to the second piston via a rotating pin. When the eccentric wheel rotates, it pushes the second piston to swing and move axially. Simultaneously, the second piston swings and moves axially, driving the first piston to move axially. In practical applications, the end face area of ​​the first piston is larger than that of the second piston, resulting in a better compression effect for the first stage than for the second stage. Both the first and second pistons have cups installed on their end faces, which seal against the side walls of the first and second compression chambers. The cups are pressed and fixed by support rings. Bearings are installed between the eccentric wheel and the second piston. Wear-resistant rings are fitted between the rotating pin and both the first and second pistons to improve the service life of the rotating pin and reduce noise.

[0035] During operation, as the first piston retracts in the first compression chamber, low-pressure air is drawn into it. Then, the first piston advances in the first compression chamber, compressing the gas and allowing it to enter the first chamber through the first one-way valve. Simultaneously, as the second piston in the second compression chamber retracts, it draws the gas undergoing primary compression in the first chamber into the second compression chamber. Then, the second piston in the second compression chamber advances, compressing and expelling the gas from the second compression chamber into the second chamber. The gas entering the second chamber is high-pressure gas. A fourth one-way valve can be installed between the second compression chamber and the second chamber. The high-pressure gas entering the second chamber is then discharged through the exhaust port into the exhaust cooling pipe and input into the air supply system. The exhaust cooling pipe can cool the high-pressure gas.

[0036] In order to filter the air entering the compressor assembly PA, the air inlet P of the compressor assembly PA is connected to the air filter AC through the tenth pipe A1.

[0037] Meanwhile, pressure sensors are installed in the left front wheel air spring LF-S, left rear wheel air spring LR-S, right front wheel air spring FR-S, right rear wheel air spring RR-S, and air tank AT. The pressure sensors can collect and record the pressure and temperature of the compressed air in the air springs and air tank.

[0038] The second pipeline B1 is also equipped with a one-way throttle valve CA, which can reduce the airflow velocity during venting.

[0039] In this embodiment, a tire inflation valve IV is also included. The tire inflation valve IV is installed on the eleventh pipe A4 between the tire and the finned heat sink FRT, which adds the tire inflation function and directly inflates the underinflated tire through the compression pump assembly PA, which is convenient and practical.

[0040] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0041] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. An air supply system for an air suspension, characterized in that, include: The compressor pump assembly (PA) is used to output high-pressure gas; The finned heat sink (FRT) has one end connected to the high-pressure gas output end of the compressor pump assembly (PA) via a first pipe (A3), and the other end connected to the dryer (DA) via a second pipe (B1) and to the pressure relief valve (ASV) via a third pipe (B2). The pressure relief valve (ASV) is also connected to the air inlet (P) of the compressor pump assembly (PA) via a fourth pipe (C2). The pressure relief valve (ASV) has a multi-stage adjustable safety pressure setting. One end of the pressure relief valve (ASV) is connected to the second pipeline (B1) through the fifth pipeline (C1). A pneumatic control valve (ACV) is installed on the fifth pipeline (C1). The second pipeline (B1) is connected to the first air valve (AV1), the second air valve (AV2), the third air valve (AV3), the fourth air valve (AV4), the first switching valve (SV-2), and the second switching valve (SV-1) in sequence through the sixth pipeline (D1). The first air valve (AV1), the second air valve (AV2), the third air valve (AV3), and the fourth air valve (AV4) are respectively connected to the left front wheel air spring (LF-S), the left rear wheel air spring (LR-S), the right front wheel air spring (FR-S), and the right rear wheel air spring (RR-S). The second switching valve (SV-1) is connected to the compressor pump assembly (PA) via the seventh pipeline (D3), and the pipeline between the first switching valve (SV-2) and the second switching valve (SV-1) is connected to the air tank (AT) via the eighth pipeline (C3). It also includes a tire inflation valve (IV), which is located on the eleventh pipe (A4) between the tire and the finned heat sink (FRT).

2. The air supply system for the air suspension according to claim 1, characterized in that: The compression pump assembly (PA) includes a two-stage pump, with compression chambers at both ends. A compression piston is installed in each compression chamber. The compression piston is driven by a motor. The compression chambers at both ends of the compression pump assembly (PA) are connected by a ninth pipe (A2). The eighth pipe (C3) is connected to the ninth pipe (A2).

3. The air supply system for the air suspension according to claim 1, characterized in that: The air inlet (P) of the compressor assembly (PA) is connected to the air filter (AC) via the tenth pipe (A1).

4. The air supply system for the air suspension according to claim 1, characterized in that: Pressure sensors are installed in the left front wheel air spring (LF-S), left rear wheel air spring (LR-S), right front wheel air spring (FR-S), right rear wheel air spring (RR-S), and air tank (AT).

5. The air supply system for the air suspension according to claim 1, characterized in that: A one-way throttle valve (CA) is also installed on the second pipeline (B1).

6. The air supply system for the air suspension according to claim 1, characterized in that: A flow control valve (FV) is installed on the third pipeline (B2).

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