Closed air supply control system and control method for air suspension

Abstract

The invention provides a closed air supply control system and a closed air supply control method for an air suspension, and relates to the technical field of air supply of air suspensions.In the control system, an air storage tank communicates with an air inlet of a reversing valve SV6 through an electromagnetic valve SV0; a first air outlet of the reversing valve SV6 is communicated with a second air outlet of the reversing valve SV6 and a second air outlet of the reversing valve SV7 after sequentially passing through the compressor, the one-way valve CV3, the drying tank and the one-way valve CV1; the four air springs communicate with an air inlet of the reversing valve SV7 through the electromagnetic valves SV1, SV2, SV3 and SV4 correspondingly, and a first air outlet of the reversing valve SV6 communicates with an air inlet of the compressor. The air filter is communicated with an air inlet of the compressor through a one-way valve CV2; and an air outlet of the one-way valve CV3 is communicated with the atmosphere through an electromagnetic valve SV5. Through the six electromagnetic valves and the two reversing valves, the electromagnetic valves are used as few as possible for power-on work, all air suspension function requirements can be met, and energy loss is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air supply for air suspension, and in particular to a closed air supply control system and a control method for air suspension. Background Art

[0002] As new energy vehicles continue to develop towards quality and high-end, air suspension has become one of the hot configurations. Compared with traditional suspension, air suspension can not only significantly improve the driving comfort of the vehicle, but also can achieve energy saving, off-road, convenient boarding and alighting, and battery protection by lifting or lowering the vehicle body. Passenger car air suspension consists of air springs, air pumps, distribution valves, air tanks, and controllers. According to the degree of exchange between the system and the outside air, air suspension can be divided into two categories: open system and closed system.

[0003] At present, the domestic market mostly adopts open air suspension systems, that is, the system is charged and exhausted and interacts with the atmosphere. When the air supply system has sufficient air pressure, when the vehicle body needs to be lifted, the high-pressure air in the air tank will immediately inflate the air spring; when the vehicle body needs to be lowered, the high-pressure air in the air spring will be directly discharged into the atmosphere. This air supply system will cause energy waste, and the air flow noise during the exhaust process is large; it is bound to cause frequent air intake and compression from the atmosphere to supply the system, and because the process gas needs to be dried, the desiccant usage time is shortened, which leads to the risk of water ingress to the air supply system. The open-loop control system has a large layout space, large energy loss, requires high motor power, high noise, and poor continuous working ability.

[0004] In a closed air suspension system, the compressed air in the system can be circulated in the system. That is, when the vehicle body needs to be lifted, the high-pressure air in the air tank is pumped into the air spring to inflate it; when the vehicle body needs to be lowered, the air pump pumps the compressed air of the air spring into the air tank. The motor power needs to be low and the single working time is short. At present, the closed system can integrate multiple components, such as air pumps, distribution valves, controllers, etc. into one, with small layout space and light weight.

[0005] However, there are many solenoid valves in the control system of the existing closed air supply system, and the system control requirements are relatively complex. Under the same working condition, multiple solenoid valves need to be energized at the same time. In addition, the pressure sensor PS in the closed air supply system is designed on the main air spring line. Due to differences in system design, the pressure sensor PS cannot monitor the pressure values ​​of all working conditions. In some cases, it is necessary to control the on and off of certain control valves separately for pressure detection. Summary of the invention

[0006] The technical problem to be solved by the present invention is that the prior art cannot realize all working conditions and the number of solenoid valves in the control system is too large. In order to overcome the above defects of the prior art, the present invention provides a closed air supply control system for air suspension.

[0007] The present invention provides a closed air supply control system for an air suspension, comprising: an air storage tank AT, an air spring, an air filter AF, a plurality of solenoid valves, a plurality of reversing valves, a plurality of one-way valves and a compressor;

[0008] The air storage tank AT is connected to the air inlet of the reversing valve SV6 through the solenoid valve SV0, and the first air outlet of the reversing valve SV6 is connected to the air inlet of the compressor; the four air springs are connected to the air inlet of the reversing valve SV7 through the solenoid valves SV1, SV2, SV3, and SV4 respectively, and a pressure sensor PS is provided in the air inlet of the reversing valve SV7, and the first air outlet of the reversing valve SV6 is connected to the air inlet of the compressor; the air filter AF is connected to the air inlet of the one-way valve CV2, and the air outlet of the one-way valve CV2 is connected to the air inlet of the compressor;

[0009] The air outlet of the compressor is connected to the air inlet of the one-way valve CV3, the air outlet of the one-way valve CV3 is connected to the air inlet of the one-way valve CV1 through the drying tank AD, and the air outlet of the one-way valve CV1 is connected to the second air outlet of the reversing valve SV6 and the second air outlet of the reversing valve SV7 respectively;

[0010] The air outlet of the one-way valve CV3 is connected to the atmosphere through the solenoid valve SV5, and the two ends of the one-way valve CV1 are connected in parallel with a throttle valve TH.

[0011] Compared with the prior art, the closed air supply control system for air suspension in the present application has the following advantages: through six solenoid valves and two reversing valves, all air suspension functional requirements can be achieved with as few solenoid valves as possible to be powered on, thereby reducing energy loss; the pressure sensor PS can monitor all operating pressure conditions, and the operating conditions do not require the separate control of certain control valves for pressure detection, making pressure monitoring simple and direct.

[0012] Another technical solution of the present invention is to provide a control method for a closed air supply control system for an air suspension, comprising the following steps:

[0013] S1. The closed air supply control system is powered on and the solenoid valve is controlled to be energized and de-energized to obtain the actual air pressure of the closed air supply control system;

[0014] S2, determine whether the actual air pressure of the closed air supply control system is lower than the lower limit of the system air pressure;

[0015] If yes, the gas storage tank AT is replenished with gas and the process goes to step S3; otherwise, the process goes directly to step S3;

[0016] S3, according to the requirements of vehicle height adjustment, controls the power on and off of the solenoid valve, and adjusts the inflation and exhaust of the air spring AS;

[0017] S4. When the vehicle is running, the pressure of the gas storage tank AT is adjusted according to demand.

[0018] Compared with the prior art, the closed air supply control system for air suspension in the present application has the following advantages: it has the functions of all closed control systems currently on the market, has the background requirements of highly systematic design, and has strong continuous working ability.

[0019] In a possible implementation manner, in step S2, replenishing the gas storage tank AT specifically includes the following steps:

[0020] The controller controls the solenoid valve SV0 to be energized and closed, the solenoid valves SV1, SV2, SV3, SV4, and SV5 to be de-energized and disconnected, the reversing valve SV6 switches to the second air outlet, and the motor M drives the compressor to operate;

[0021] The air supply air flow path is as follows: the air filter AF is sucked in and compressed by the compressor through the one-way valve CV2, and then passes through the one-way valve CV3, the drying tank AD, the one-way valve CV1, the reversing valve SV6, and the solenoid valve SV0 in sequence to connect with the air storage tank AT.

[0022] The controller calculates the air supply volume according to the original air pressure of the air tank AT, the volume of the air tank AT, and the air supply pressure measured by the pressure sensor PS, and when the air supply volume does not reach the preset air supply volume, the controller continues to control the motor M and the solenoid valve SV0 to work.

[0023] Compared with the prior art, it only needs to control one solenoid valve and one reversing valve, and then the air storage tank AT can be replenished with air through the suction of the compressor, which is simple to operate and easy to implement.

[0024] In a possible implementation, after the gas storage tank AT is replenished with gas, a moisture back-blowing step of the closed gas supply control system is performed, which specifically includes the following steps:

[0025] The controller controls the solenoid valves SV0 and SV5 to be energized and closed, the solenoid valves SV1, SV2, SV3, and SV4 to be de-energized and disconnected, and the reversing valve SV6 to switch to the second air outlet;

[0026] The moisture backflow airflow path is: the compressed air in the air tank A passes through the solenoid valve SV0, the reversing valve SV6, the throttle valve TH, the drying tank AD, the solenoid valve SV5 in sequence and then is discharged to the atmosphere;

[0027] The controller continuously controls the solenoid valves SV0 and SV5 to operate according to the exhaust pressure measured by the pressure sensor PS until the exhaust pressure is less than the preset pressure limit value.

[0028] Compared with the prior art, after the air replenishment is completed, the moisture in the pipeline can be removed by controlling two solenoid valves and a reversing valve, and the operation is simple.

[0029] In a possible implementation, in step S3, if the vehicle body needs to be lifted, the air storage tank AT is controlled to inflate the air spring AS, which specifically includes the following steps:

[0030] The controller controls the solenoid valves SV0, SV1, SV2, SV3, and SV4 to be energized and closed, the solenoid valve SV5 is de-energized and disconnected, the reversing valve SV6 is switched to the first air outlet, the reversing valve SV7 is switched to the second air outlet, and the motor M drives the compressor to operate;

[0031] The charging air flow path is as follows: the compressed air in the air tank AT is sucked in and compressed by the compressor after passing through the solenoid valve SV0 and the reversing valve SV6, and then passes through the one-way valve CV3, the drying tank AD, the one-way valve CV1, the reversing valve SV7 in sequence, and then passes through the solenoid valves SV1, SV2, SV3, and SV4 respectively to communicate with the corresponding air spring AS;

[0032] The controller continuously controls the solenoid valves SV0, SV1, SV2, SV3, SV4 and the motor M to operate according to the inflation pressure measured by the pressure sensor PS before the inflation pressure reaches the preset lifting vehicle body pressure.

[0033] Compared with the existing technology, in addition to the necessary four solenoid valves to connect the air springs, only one solenoid valve, one reversing valve, and a compressor are needed to lift the vehicle body, which is simple to operate.

[0034] In a possible implementation, in step S3, if the vehicle body needs to be lowered, the air spring AS is controlled to exhaust air into the air storage tank AT, which specifically includes the following steps:

[0035] The controller controls the solenoid valves SV0, SV1, SV2, SV3, and SV4 to be energized and closed, the solenoid valve SV5 is de-energized and disconnected, the reversing valve SV6 switches to the second air outlet, the reversing valve SV7 switches to the first air outlet, and the motor M drives the compressor to operate;

[0036] The exhaust air flow path is as follows: the four air springs AS are connected to the reversing valve SV7 through the solenoid valves SV1, SV2, SV3, and SV4 respectively, and then connected to the air storage tank AT through the compressor, the one-way valve CV3, the drying tank AD, the one-way valve CV1, the reversing valve SV6, and the solenoid valve SV0 in sequence;

[0037] The controller continuously controls the solenoid valves SV0, SV1, SV2, SV3, SV4 and the motor M to operate according to the exhaust pressure measured by the pressure sensor PS before the exhaust pressure reaches the preset reduced vehicle body pressure.

[0038] Compared with the existing technology, in addition to the necessary four solenoid valves to connect the air springs, only one solenoid valve, two reversing valves, and a compressor are needed to lower the vehicle body, which is simple to operate.

[0039] In a possible implementation, in step S3, if the vehicle body needs to be lowered, and the internal pressure of the air spring is greater than the air spring pressure threshold value and less than the air spring pressure upper limit value, the air spring AS is controlled to exhaust air to the atmosphere slowly, specifically including the following steps:

[0040] The controller controls the solenoid valve SV0 to disconnect when it loses power, the solenoid valves SV1, SV2, SV3, SV4, and SV5 to close when they are powered on, and the reversing valve SV7 switches to the second air outlet;

[0041] The slow exhaust airflow path is: the four air springs AS are connected to the reversing valve SV7 through the solenoid valves SV1, SV2, SV3, and SV4 respectively, and then pass through the throttle valve TH, the drying tank AD, and the solenoid valve SV5 in sequence before being discharged to the atmosphere;

[0042] The controller continuously controls the solenoid valves SV1, SV2, SV3, SV4, and SV5 to operate according to the slow exhaust pressure measured by the pressure sensor PS when the target vehicle height has not been reached.

[0043] Compared with the prior art, in the process of slowly lowering the vehicle body, in addition to the necessary four solenoid valves to connect the air springs, only one solenoid valve is needed to cooperate with a reversing valve to achieve the lowering of the vehicle body, which is simple to operate.

[0044] In a possible implementation, in step S3, if the vehicle body needs to be lowered and the internal pressure of the air spring is greater than the upper limit of the air spring pressure, the air spring AS is controlled to be exhausted to the atmosphere quickly, specifically including the following steps:

[0045] The controller controls the solenoid valve SV0 to disconnect when it loses power, the solenoid valves SV1, SV2, SV3, SV4, and SV5 to close when they are powered on, the reversing valve SV7 switches to the first air outlet, and the motor M drives the compressor to run;

[0046] The quick exhaust airflow path is: the four air springs AS are connected to the reversing valve SV7 through the solenoid valves SV1, SV2, SV3, and SV4 respectively, and then pass through the compressor, the one-way valve CV3, and the solenoid valve SV5 in sequence before being discharged to the atmosphere;

[0047] The controller continuously controls the solenoid valves SV1, SV2, SV3, SV4, SV5 and the motor M to operate according to the quick exhaust pressure measured by the pressure sensor PS when the target vehicle height is not reached.

[0048] Compared with the prior art, in the process of quickly lowering the vehicle body, in addition to the necessary four solenoid valves to connect the air springs, only one solenoid valve, one reversing valve, and a compressor are needed to lower the vehicle body, which is simple to operate.

[0049] In a possible implementation, in step S4, when the vehicle is traveling, if the internal pressure of the air storage tank AT is greater than the upper limit of the system air pressure, the air storage tank AT is quickly exhausted to the atmosphere, specifically including the following steps:

[0050] The controller controls the solenoid valves SV0 and SV5 to be energized and closed, the solenoid valves SV1, SV2, SV3, and SV4 to be de-energized and disconnected, the reversing valve SV6 switches to the first air outlet, and the motor M drives the compressor to operate;

[0051] The quick exhaust airflow path is: the air tank AT is connected to the reversing valve SV6 through the solenoid valve SV5, and then passes through the compressor, the one-way valve CV3, and the solenoid valve SV5 in sequence before being discharged to the atmosphere;

[0052] The controller continuously controls the solenoid valves SV0, SV5 and the motor M to operate according to the exhaust pressure measured by the pressure sensor PS until the exhaust pressure is not less than the upper limit of the system air pressure.

[0053] Compared with the prior art, the pressure of the gas storage tank can be reduced by two solenoid valves and one reversing valve, which is simple to operate and easy to implement.

[0054] In a possible implementation, in step S4, when the vehicle is driving, if the internal pressure of the air tank AT is greater than the system air pressure threshold value and less than the system air pressure upper limit value, and the internal pressure of the air spring AS is greater than the air spring air pressure threshold value and less than the air spring air pressure upper limit value, then the air tank AT and the air spring AS are slowly exhausted to the atmosphere, specifically including the following steps:

[0055] The controller controls the solenoid valves SV0, SV1, SV2, SV3, SV4, and SV5 to be energized and closed, the reversing valve SV6 switches to the second air outlet, and the reversing valve SV7 switches to the second air outlet;

[0056] The exhaust airflow path is as follows: the four air springs AS are connected to the reversing valve SV7 through the solenoid valves SV1, SV2, SV3, and SV4 respectively, the air storage tank AT is connected to the reversing valve SV6 through the solenoid valve SV0, the air exchange valve SV7 and the air exchange valve SV6 are both connected to the throttle valve TH, and then are discharged to the atmosphere through the drying tank AD and the solenoid valve SV5 in sequence;

[0057] The controller continuously controls the operation of solenoid valves SV0, SV1, SV2, SV3, SV4, and SV5 according to the exhaust pressure measured by the pressure sensor PS until the exhaust pressure is not less than the upper limit of the system air pressure.

[0058] Compared with the prior art, the common exhaust of the air storage tank and the air spring is achieved by controlling only six solenoid valves and two reversing valves, and the number of practical solenoid valves is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 A schematic diagram of a closed air supply control system for an air suspension according to the present invention;

[0060] Figure 2 A schematic diagram of the invention for replenishing air when the pressure in a closed air supply control system for an air suspension is too low;

[0061] Figure 3 It is a principle diagram of system air replenishment and moisture back blowing in a closed air supply control system for air suspension of the present invention;

[0062] Figure 4 A schematic diagram of a system inflation principle in a closed air supply control system for an air suspension according to the present invention;

[0063] Figure 5 A schematic diagram of system exhaust in a closed air supply control system for an air suspension according to the present invention;

[0064] Figure 6 A schematic diagram of a system slow exhaust in a closed air supply control system for an air suspension according to the present invention;

[0065] Figure 7 A schematic diagram of a system quick exhaust in a closed air supply control system for an air suspension according to the present invention;

[0066] Figure 8 A schematic diagram of the rapid exhaust principle of an air storage tank in a closed air supply control system for an air suspension according to the present invention;

[0067] Fig. 9 The present invention is a schematic diagram of a system and an air tank slow exhaust principle in a closed air supply control system for an air suspension. DETAILED DESCRIPTION

[0068] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0069] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0070] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0071] Embodiment 1

[0072] See also Figure 1 As shown, an embodiment of the present application discloses a closed air supply control system for an air suspension, including: an air storage tank AT, an air spring AS, an air filter AF, multiple solenoid valves, multiple reversing valves, multiple one-way valves, a drying tank AD and a compressor.

[0073] The air storage tank AT is connected to the air inlet of the reversing valve SV6 through the solenoid valve SV0, and the first air outlet of the reversing valve SV6 is connected to the air inlet of the compressor; the four air springs AS are connected to the air inlet of the reversing valve SV7 through the solenoid valves SV1, SV2, SV3, and SV4 respectively, a pressure sensor PS is provided in the air inlet of the reversing valve SV7, and the first air outlet of the reversing valve SV6 is connected to the air inlet of the compressor; the air filter AF is connected to the air inlet of the one-way valve CV2, and the air outlet of the one-way valve CV2 is connected to the air inlet of the compressor.

[0074] The air outlet of the compressor is connected to the air inlet of the one-way valve CV3, the air outlet of the one-way valve CV3 is connected to the air inlet of the one-way valve CV1 through the drying tank AD, and the air outlet of the one-way valve CV1 is connected to the second air outlet of the reversing valve SV6 and the second air outlet of the reversing valve SV7 respectively.

[0075] The air outlet of the one-way valve CV3 is connected to the atmosphere through the solenoid valve SV5, and throttle valves TH are connected in parallel at both ends of the one-way valve CV1.

[0076] Among them, the solenoid valves SV0, SV1, SV2, SV3, SV4, SV5, the reversing valves SV6, SV7, the compressor and the pressure sensor PS are all electrically connected to the controller, and the operation of each solenoid valve, the reversing valve and the compressor is controlled by the controller.

[0077] In this embodiment, the solenoid valves SV1, SV2, SV3, and SV4 are all two-position two-way switch valves and require reverse sealing. The solenoid valves SV0 and SV5 are both two-position two-way switch valves and do not require reverse sealing.

[0078] Both the reversing valve SV6 and the reversing valve SV7 are two-position three-way solenoid valves, and both have the air inlet and the second air outlet connected by default.

[0079] The closed air supply control system of this embodiment integrates the air filter AF, compressor, drying tank, solenoid valve, air storage tank and controller, and has the functions of all closed control systems currently on the market, and has the background requirements of highly systematic design. The compressor is driven by a motor, which requires low power, low noise and strong continuous working ability.

[0080] The present invention only uses 8 control solenoid valves (solenoid valves SV0, SV1, SV2, SV3, SV4, SV5, reversing valves SV6, SV7) to achieve all air suspension functional requirements, uses as few solenoid valves as possible to energize and work to achieve functional requirements, and reduces energy loss.

[0081] The pressure sensor PS is arranged on the air inlet side of the reversing valve SV7, and can monitor the pressure conditions of all working conditions. In important working conditions, it is not necessary to control the on and off of certain control valves separately for the detection of pressure, and the pressure monitoring is simple and direct.

[0082] Embodiment 2

[0083] See also Figure 2 to Figure 9 As shown, the embodiment of the present application discloses a control method for a closed air supply control system for an air suspension, comprising the following steps:

[0084] S1. The closed air supply control system of the air suspension is powered on, and the power on and power off of the solenoid valve are controlled to obtain the actual air pressure of the closed air supply control system of the air suspension;

[0085] S2, determining whether the actual air pressure of the closed air supply control system of the air suspension is lower than the lower limit of the system air pressure;

[0086] If yes, the gas storage tank AT is replenished with gas and the process goes to step S3; otherwise, the process goes directly to step S3;

[0087] S3, according to the requirements of vehicle height adjustment, control the energization and de-energization of the solenoid valve to adjust the inflation and exhaust of the air spring AS;

[0088] S4. When the vehicle is running, the pressure of the gas storage tank AT is adjusted according to demand.

[0089] First, in step S1, after the system is powered on, the solenoid valve SV0 can be controlled to be energized and closed, the solenoid valves SV1, SV2, SV3, SV4, and SV5 can be powered off and disconnected, the reversing valve SV6 is switched to the second air outlet, and the air exchange valve SV7 is switched to the second air outlet. At this time, the pressure sensor PS can detect the internal air pressure of the air tank AT, and thus obtain the actual air pressure of the closed air supply control system of the air suspension.

[0090] Of course, the air pressure of the four air springs AS can also be obtained by controlling the solenoid valves SV0 and SV5 to be de-energized and disconnected, and then sequentially controlling the solenoid valves SV1, SV2, SV3, and SV4 to be energized and closed.

[0091] Then, in step S2, based on the actual air pressure obtained in step S1, it is determined whether it is lower than the lower limit of the system air pressure;

[0092] If so, the gas tank AT needs to be refilled; if not, no refilling is required.

[0093] See also Figure 2 As shown, in step S2, the gas storage tank AT is replenished with gas, that is, the system pressure is too low to replenish gas, which specifically includes the following steps:

[0094] The controller controls the solenoid valve SV0 to be energized and closed, the solenoid valves SV1, SV2, SV3, SV4, and SV5 to be de-energized and disconnected, the reversing valve SV6 switches to the second air outlet, and the motor M drives the compressor to operate;

[0095] The air flow path of the air supply at this time is: the air filter AF is sucked in and compressed by the compressor through the one-way valve CV2, and then passes through the one-way valve CV3, the drying tank AD, the one-way valve CV1, the reversing valve SV6, and the solenoid valve SV0 in sequence to connect with the air storage tank AT.

[0096] The controller can calculate the air supply pressure according to the original air pressure of the air tank AT, the volume of the air tank AT, and the air supply pressure measured by the pressure sensor PS. Then, when the air supply pressure does not reach the preset air supply pressure, the controller continuously controls the motor M and the solenoid valve SV0 to ensure continuous air supply.

[0097] In actual use, see Figure 3 As shown, after the gas storage tank AT is completed with gas replenishment, the closed gas supply control system moisture back-blowing step is executed, that is, the system gas replenishment moisture back-blowing, which specifically includes the following steps:

[0098] The controller controls the solenoid valves SV0 and SV5 to be energized and closed, the solenoid valves SV1, SV2, SV3, and SV4 to be de-energized and disconnected, and the reversing valve SV6 to switch to the second air outlet;

[0099] The moisture back-blowing airflow path is as follows: the compressed air in the air storage tank A passes through the solenoid valve SV0, the reversing valve SV6, the throttle valve TH, the drying tank AD, and the solenoid valve SV5 in sequence and then is discharged into the atmosphere.

[0100] The exhaust pressure measured by the pressure sensor PS is automatically disconnected after the controller controls the solenoid valves SV0 and SV5 to work for a certain period of time, and it is necessary to ensure that the exhaust pressure is greater than the preset air pressure limit value.

[0101] See also Figure 4 As shown, in step S3, if the vehicle body needs to be lifted, the air storage tank AT is controlled to inflate the air spring AS, that is, the system is inflated, which specifically includes the following steps:

[0102] The controller controls the solenoid valves SV0, SV1, SV2, SV3, and SV4 to be energized and closed, the solenoid valve SV5 is de-energized and disconnected, the reversing valve SV6 is switched to the first air outlet, the reversing valve SV7 is switched to the second air outlet, and the motor M drives the compressor to operate;

[0103] The inflation air flow path is as follows: the compressed air in the air tank AT is sucked in and compressed by the compressor after passing through the solenoid valve SV0 and the reversing valve SV6, and then passes through the one-way valve CV3, the drying tank AD, the one-way valve CV1, and the reversing valve SV7 in turn, and then passes through the solenoid valves SV1, SV2, SV3, and SV4 respectively to connect with the corresponding air spring AS.

[0104] Before the vehicle body reaches the preset height, the controller continuously controls the solenoid valves SV0, SV1, SV2, SV3, SV4 and the motor M to work. Of course, the controller can also continuously control the solenoid valves SV0, SV1, SV2, SV3, SV4 and the motor M to work according to the inflation pressure measured by the pressure sensor PS before the inflation pressure reaches the preset lifting vehicle body pressure.

[0105] See also Figure 5 As shown, in step S3, if the vehicle body needs to be lowered, the air spring AS is controlled to exhaust air to the air storage tank AT, that is, the system is exhausted, which specifically includes the following steps:

[0106] The solenoid valves SV0, SV1, SV2, SV3, and SV4 are energized and closed, the solenoid valve SV5 is de-energized and disconnected, the reversing valve SV6 switches to the second air outlet, the reversing valve SV7 switches to the first air outlet, and the motor M drives the compressor to operate;

[0107] The exhaust air flow path is: the four air springs AS are connected to the reversing valve SV7 through the solenoid valves SV1, SV2, SV3, and SV4 respectively, and then pass through the compressor, the one-way valve CV3, the drying tank AD, the one-way valve CV1, the reversing valve SV6, and the solenoid valve SV0 in turn to be connected to the air storage tank AT.

[0108] Before the vehicle body is not lowered to a preset height, the controller continuously controls the solenoid valves SV0, SV1, SV2, SV3, SV4 and the motor M to operate. Of course, the controller can also continuously control the solenoid valves SV0, SV1, SV2, SV3, SV4 and the motor M to operate when the target vehicle body height is not reached according to the exhaust pressure measured by the pressure sensor PS.

[0109] Through the above process, the vehicle body is raised or lowered through the gas exchange between the air tank AT and the air spring AS, achieving silent and fast adjustment.

[0110] See also Figure 6 As shown, in step S3, if the vehicle body needs to be lowered, and the internal pressure of the air spring is greater than the air spring pressure threshold value and less than the air spring pressure upper limit value, the air spring AS can be controlled to exhaust slowly to the atmosphere, that is, the system exhausts slowly, specifically including the following steps:

[0111] The controller controls the solenoid valve SV0 to disconnect when it loses power, the solenoid valves SV1, SV2, SV3, SV4, and SV5 to close when they are powered on, and the reversing valve SV7 switches to the second air outlet;

[0112] The slow exhaust air flow path is: the four air springs AS are connected to the reversing valve SV7 through the solenoid valves SV1, SV2, SV3, and SV4 respectively, and then pass through the throttle valve TH, the drying tank AD, and the solenoid valve SV5 in sequence before being discharged to the atmosphere.

[0113] Before the vehicle body is lowered to a preset height, the controller continuously controls the solenoid valves SV1, SV2, SV3, SV4, and SV5 to operate. Of course, the controller can also continuously control the solenoid valves SV1, SV2, SV3, SV4, and SV5 to operate when the target vehicle body height is not reached according to the slow exhaust pressure measured by the pressure sensor PS.

[0114] See also Figure 7 As shown, in step S3, if the vehicle body needs to be lowered and the internal pressure of the air spring is greater than the upper limit of the air spring pressure, the air spring AS can be controlled to exhaust quickly to the atmosphere, that is, the system exhausts quickly, which specifically includes the following steps:

[0115] The solenoid valve SV0 loses power and disconnects, the solenoid valves SV1, SV2, SV3, SV4, and SV5 are powered and closed, the reversing valve SV7 switches to the first air outlet, and the motor M drives the compressor to run;

[0116] The quick exhaust air flow path is: the four air springs AS are connected to the reversing valve SV7 through the solenoid valves SV1, SV2, SV3, and SV4 respectively, and then pass through the compressor, the one-way valve CV3, and the solenoid valve SV5 in sequence before being discharged to the atmosphere.

[0117] Before the vehicle body is lowered to a preset height, the controller continuously controls the solenoid valves SV1, SV2, SV3, SV4, and SV5 to operate. Of course, the controller can also continuously control the solenoid valves SV1, SV2, SV3, SV4, and SV5 to operate according to the quick exhaust pressure measured by the pressure sensor PS before the quick exhaust pressure reaches the preset vehicle body lowering pressure.

[0118] In this process, the reversing valve SV7 is controlled to determine whether to perform pressure detection of the pressure sensor PS. If the reversing valve SV7 is switched to the first air outlet, pressure detection is performed; if the reversing valve SV7 is switched to the second air outlet, pressure detection is not performed.

[0119] See also Figure 8 As shown, in step S4, when the vehicle is running, if the pressure of the air storage tank AT is greater than the upper limit of the system air pressure, the air storage tank AT is controlled to exhaust air to the atmosphere, that is, the air storage tank AT is quickly exhausted, which specifically includes the following steps:

[0120] The controller controls the solenoid valves SV0 and SV5 to be energized and closed, the solenoid valves SV1, SV2, SV3, and SV4 to be de-energized and disconnected, the reversing valve SV6 switches to the first air outlet, and the motor M drives the compressor to operate;

[0121] The gas storage tank AT is connected to the reversing valve SV6 through the solenoid valve SV5, and then passes through the compressor, the one-way valve CV3, and the solenoid valve SV5 in sequence before being discharged to the atmosphere.

[0122] The controller continuously controls the solenoid valves SV0, SV5 and the motor M to operate according to the exhaust pressure measured by the pressure sensor PS until the exhaust pressure is not less than the upper limit of the system air pressure.

[0123] See also Fig. 9 As shown, in step S4, when the vehicle is running, if the internal pressure of the air tank AT is greater than the system air pressure threshold value and less than the system air pressure upper limit value, and the internal pressure of the air spring AS is greater than the air spring air pressure threshold value and less than the air spring air pressure upper limit value, the air tank AT and the air spring AS are slowly exhausted to the atmosphere, that is, the system and the air tank AT are slowly exhausted, which specifically includes the following steps:

[0124] The solenoid valves SV0, SV1, SV2, SV3, SV4, and SV5 are energized and closed, the reversing valve SV6 is switched to the second air outlet, and the reversing valve SV7 is switched to the second air outlet;

[0125] The exhaust air flow path is: the four air springs AS are connected to the reversing valve SV7 through the solenoid valves SV1, SV2, SV3, and SV4 respectively, the air storage tank AT is connected to the reversing valve SV6 through the solenoid valve SV0, the ventilation valve SV7 and the ventilation valve SV6 are both connected to the throttle valve TH, and then pass through the drying tank AD and the solenoid valve SV5 in turn and are discharged to the atmosphere.

[0126] The controller continuously controls the operation of solenoid valves SV0, SV1, SV2, SV3, SV4, and SV5 according to the exhaust pressure measured by the pressure sensor PS until the exhaust pressure is not less than the upper limit of the system air pressure.

[0127] The closed air supply control system of this embodiment integrates the air filter AF, compressor, drying tank, solenoid valve, air storage tank and controller, and has the functions of all closed control systems currently on the market, and has the background requirements of highly systematic design. The compressor is driven by a motor, which requires low power, low noise and strong continuous working ability.

[0128] The present invention only uses 8 control solenoid valves (solenoid valves SV0, SV1, SV2, SV3, SV4, SV5, reversing valves SV6, SV7) to achieve all air suspension functional requirements, uses as few solenoid valves as possible to energize and work to achieve functional requirements, and reduces energy loss.

[0129] The pressure sensor PS is arranged on the air inlet side of the reversing valve SV7, and can monitor the pressure conditions of all working conditions. In important working conditions, it is not necessary to control the on and off of certain control valves separately for the detection of pressure, and the pressure monitoring is simple and direct.

[0130] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0131] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A closed air supply control system for an air suspension, characterized in that: include: Air storage tank AT, air spring AS, air filter AF, multiple solenoid valves, multiple reversing valves, multiple check valves, drying tank AD and compressor; The air storage tank AT is connected to the air inlet of the reversing valve SV6 through the solenoid valve SV0, and the first air outlet of the reversing valve SV6 is connected to the air inlet of the compressor; the four air springs AS are connected to the air inlet of the reversing valve SV7 through the solenoid valves SV1, SV2, SV3, and SV4 respectively, and a pressure sensor PS is provided in the air inlet of the reversing valve SV7, and the first air outlet of the reversing valve SV6 is connected to the air inlet of the compressor; the air filter AF is connected to the air inlet of the one-way valve CV2, and the air outlet of the one-way valve CV2 is connected to the air inlet of the compressor; The air outlet of the compressor is connected to the air inlet of the one-way valve CV3, the air outlet of the one-way valve CV3 is connected to the air inlet of the one-way valve CV1 through the drying tank AD, and the air outlet of the one-way valve CV1 is connected to the second air outlet of the reversing valve SV6 and the second air outlet of the reversing valve SV7 respectively; The air outlet of the one-way valve CV3 is connected to the atmosphere through the solenoid valve SV5, and the two ends of the one-way valve CV1 are connected in parallel with a throttle valve TH.

2. A control method for the closed air supply control system for air suspension according to claim 1, characterized in that: The steps include: S1. The closed air supply control system is powered on and the solenoid valve is controlled to be energized and de-energized to obtain the actual air pressure of the closed air supply control system; S2, determine whether the actual air pressure of the closed air supply control system is lower than the lower limit of the system air pressure; If yes, the gas storage tank AT is replenished with gas and the process goes to step S3; otherwise, the process goes directly to step S3; S3, according to the requirements of vehicle height adjustment, controls the power on and off of the solenoid valve, and adjusts the inflation and exhaust of the air spring AS; S4. When the vehicle is running, the pressure of the gas storage tank AT is adjusted according to demand.

3. The control method for a closed air supply control system for an air suspension according to claim 2, characterized in that: In step S2, the gas replenishment of the gas storage tank AT specifically includes the following steps: The controller controls the solenoid valve SV0 to be energized and closed, the solenoid valves SV1, SV2, SV3, SV4, and SV5 to be de-energized and disconnected, the reversing valve SV6 switches to the second air outlet, and the motor M drives the compressor to operate; The air supply air flow path is as follows: the air filter AF is sucked in and compressed by the compressor through the one-way valve CV2, and then passes through the one-way valve CV3, the drying tank AD, the one-way valve CV1, the reversing valve SV6, and the solenoid valve SV0 in sequence to connect with the air storage tank AT. The controller calculates the air supply volume according to the original air pressure of the air tank AT, the volume of the air tank AT and the air supply pressure measured by the pressure sensor PS, and when the air supply volume does not reach the preset air supply volume, the controller continues to control the motor M and the solenoid valve SV0 to work.

4. The control method of the closed air supply control system for air suspension according to claim 3, characterized in that: After the air storage tank AT is replenished, the closed air supply control system moisture backflow step is performed, which specifically includes the following steps: The controller controls the solenoid valves SV0 and SV5 to be energized and closed, the solenoid valves SV1, SV2, SV3, and SV4 to be de-energized and disconnected, and the reversing valve SV6 to switch to the second air outlet; The moisture backflow airflow path is: the compressed air in the air tank A passes through the solenoid valve SV0, the reversing valve SV6, the throttle valve TH, the drying tank AD, the solenoid valve SV5 in sequence and then is discharged to the atmosphere; The controller continuously controls the solenoid valves SV0 and SV5 to operate according to the exhaust pressure measured by the pressure sensor PS until the exhaust pressure is less than the preset pressure limit value.

5. The control method for a closed air supply control system for an air suspension according to claim 2, characterized in that: In step S3, if the vehicle body needs to be lifted, the air storage tank AT is controlled to inflate the air spring AS, which specifically includes the following steps: The controller controls the solenoid valves SV0, SV1, SV2, SV3, and SV4 to be energized and closed, the solenoid valve SV5 is de-energized and disconnected, the reversing valve SV6 is switched to the first air outlet, the reversing valve SV7 is switched to the second air outlet, and the motor M drives the compressor to operate; The charging air flow path is as follows: the compressed air in the air tank AT is sucked in and compressed by the compressor after passing through the solenoid valve SV0 and the reversing valve SV6, and then passes through the one-way valve CV3, the drying tank AD, the one-way valve CV1, the reversing valve SV7 in sequence, and then passes through the solenoid valves SV1, SV2, SV3, and SV4 respectively to communicate with the corresponding air spring AS; The controller continuously controls the solenoid valves SV0, SV1, SV2, SV3, SV4 and the motor M to operate according to the inflation pressure measured by the pressure sensor PS when the target vehicle height is not reached.

6. The control method of the closed air supply control system for air suspension according to claim 2, characterized in that: In step S3, if the vehicle body needs to be lowered, the air spring AS is controlled to exhaust air into the air storage tank AT, which specifically includes the following steps: The controller controls the solenoid valves SV0, SV1, SV2, SV3, and SV4 to be energized and closed, the solenoid valve SV5 is de-energized and disconnected, the reversing valve SV6 switches to the second air outlet, the reversing valve SV7 switches to the first air outlet, and the motor M drives the compressor to operate; The exhaust air flow path is as follows: the four air springs AS are connected to the reversing valve SV7 through the solenoid valves SV1, SV2, SV3, and SV4 respectively, and then connected to the air storage tank AT through the compressor, the one-way valve CV3, the drying tank AD, the one-way valve CV1, the reversing valve SV6, and the solenoid valve SV0 in sequence; The controller continuously controls the solenoid valves SV0, SV1, SV2, SV3, SV4 and the motor M to operate according to the exhaust pressure measured by the pressure sensor PS when the target vehicle height has not been reached.

7. The control method of the closed air supply control system for air suspension according to claim 2, characterized in that: In step S3, if the vehicle body needs to be lowered, and the internal pressure of the air spring is greater than the air spring pressure threshold value and less than the air spring pressure upper limit value, the air spring AS is controlled to exhaust air to the atmosphere slowly, specifically including the following steps: The controller controls the solenoid valve SV0 to disconnect when it loses power, the solenoid valves SV1, SV2, SV3, SV4, and SV5 to close when they are powered on, and the reversing valve SV7 switches to the second air outlet; The slow exhaust airflow path is: the four air springs AS are connected to the reversing valve SV7 through the solenoid valves SV1, SV2, SV3, and SV4 respectively, and then pass through the throttle valve TH, the drying tank AD, and the solenoid valve SV5 in sequence before being discharged to the atmosphere; The controller continuously controls the solenoid valves SV1, SV2, SV3, SV4, and SV5 to operate according to the slow exhaust pressure measured by the pressure sensor PS before the slow exhaust pressure reaches the preset reduced vehicle body pressure.

8. The control method of the closed air supply control system for air suspension according to claim 2, characterized in that: In step S3, if the vehicle body needs to be lowered and the internal pressure of the air spring is greater than the upper limit of the air spring pressure, the air spring AS is controlled to be exhausted to the atmosphere quickly, which specifically includes the following steps: The controller controls the solenoid valve SV0 to disconnect when it loses power, the solenoid valves SV1, SV2, SV3, SV4, and SV5 to close when they are powered on, the reversing valve SV7 switches to the first air outlet, and the motor M drives the compressor to run; The quick exhaust airflow path is: the four air springs AS are connected to the reversing valve SV7 through the solenoid valves SV1, SV2, SV3, and SV4 respectively, and then pass through the compressor, the one-way valve CV3, and the solenoid valve SV5 in sequence before being discharged to the atmosphere; The controller continuously controls the solenoid valves SV1, SV2, SV3, SV4, SV5 and the motor M to operate according to the quick exhaust pressure measured by the pressure sensor PS before the quick exhaust pressure reaches the preset reduced vehicle body pressure.

9. The control method for a closed air supply control system for an air suspension according to claim 2, characterized in that: In step S4, when the vehicle is running, if the internal pressure of the air storage tank AT is greater than the upper limit of the system air pressure, the air storage tank AT is quickly exhausted to the atmosphere, which specifically includes the following steps: The controller controls the solenoid valves SV0 and SV5 to be energized and closed, the solenoid valves SV1, SV2, SV3, and SV4 to be de-energized and disconnected, the reversing valve SV6 switches to the first air outlet, and the motor M drives the compressor to operate; The quick exhaust airflow path is: the air tank AT is connected to the reversing valve SV6 through the solenoid valve SV5, and then passes through the compressor, the one-way valve CV3, and the solenoid valve SV5 in sequence before being discharged to the atmosphere; The controller continuously controls the solenoid valves SV0, SV5 and the motor M to operate according to the exhaust pressure measured by the pressure sensor PS until the exhaust pressure is not less than the upper limit of the system air pressure.

10. The control method of the closed air supply control system for air suspension according to claim 2, characterized in that: In step S4, when the vehicle is running, if the internal pressure of the air tank AT is greater than the system air pressure threshold value and less than the system air pressure upper limit value, and the internal pressure of the air spring AS is greater than the air spring air pressure threshold value and less than the air spring air pressure upper limit value, the air tank AT and the air spring AS are slowly exhausted to the atmosphere, specifically including the following steps: The controller controls the solenoid valves SV0, SV1, SV2, SV3, SV4, and SV5 to be energized and closed, the reversing valve SV6 switches to the second air outlet, and the reversing valve SV7 switches to the second air outlet; The exhaust airflow path is as follows: the four air springs AS are connected to the reversing valve SV7 through the solenoid valves SV1, SV2, SV3, and SV4 respectively, the air storage tank AT is connected to the reversing valve SV6 through the solenoid valve SV0, the air exchange valve SV7 and the air exchange valve SV6 are both connected to the throttle valve TH, and then are discharged to the atmosphere through the drying tank AD and the solenoid valve SV5 in sequence; The controller continuously controls the operation of solenoid valves SV0, SV1, SV2, SV3, SV4, and SV5 according to the exhaust pressure measured by the pressure sensor PS until the exhaust pressure is not less than the upper limit of the system air pressure.

Images