Auxiliary supercharging system, auxiliary supercharging method and commercial vehicle

Abstract

The application discloses an auxiliary supercharging system, an auxiliary supercharging method and a commercial vehicle. The auxiliary supercharging system comprises a turbocharger, an auxiliary unit and a valve group. The gas outlet of the turbocharger is communicated with the air intake manifold of the engine, and the air inlet of the turbocharger is communicated with the exhaust port of the engine. The auxiliary unit comprises an air compressor, a dryer, a whole vehicle storage tank and a medium-pressure storage tank. The air outlet of the air compressor is communicated with the air inlet of the dryer. The air outlet of the dryer is communicated with the whole vehicle storage tank and has a regeneration gas circuit. The regeneration gas outlet of the dryer is communicated with the medium-pressure storage tank. The medium-pressure storage tank is respectively communicated with the whole vehicle storage tank and the air intake manifold. The valve group comprises a gas feeding valve and an adjusting valve. The gas feeding valve is arranged in the communication pipeline between the medium-pressure storage tank and the air intake manifold. The adjusting valve is arranged in the communication pipeline between the medium-pressure storage tank and the whole vehicle storage tank. The scheme can improve the air supply of the engine, effectively improve the torque range in the low-speed area, improve the engine efficiency and responsiveness.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine intake supercharging system, in particular to an auxiliary supercharging system, an auxiliary supercharging method and a commercial vehicle. BACKGROUND

[0002] The engine supercharging system usually adopts the exhaust turbocharging technology, which is a technology of driving the compressor by the exhaust gas generated during the operation of the engine, and the purpose is to increase the engine intake air volume and the equivalent compression ratio of the engine without increasing the engine displacement, which can effectively improve the engine power density and torque density.

[0003] For example, the patent CN206625890U discloses a turbocharged engine, which comprises a cylinder, a compressor and a turbocharger, the compressor is connected with the air inlet of the cylinder through an air inlet pipe, and is used for delivering compressed air to the cylinder; the compressor and the turbocharger are coaxially connected; the exhaust port of the cylinder is connected with the turbocharger through an exhaust discharge channel, and the cylinder is provided with a sealing chamber connected with the cylinder near the bottom of the crankshaft end, and the sealing chamber is connected with the turbocharger through an air pressure pipe, which can complement and complement the previous turbocharging system. So as to further improve the power of the engine and the efficiency of fuel combustion.

[0004] However, the turbocharged engine has insufficient boost pressure at low speed due to insufficient exhaust capacity, which limits the increase of fuel injection amount and causes poor low-speed torque performance, which is not conducive to the power performance of the automobile; and the turbocharger has aerodynamic lag phenomenon, which causes insufficient intake air volume of the engine under dynamic working condition and slow dynamic response of the engine. SUMMARY

[0005] The present application aims to overcome the above technical deficiencies, and provides an auxiliary supercharging system to solve the technical problems that the turbocharged engine has insufficient boost pressure at low speed due to insufficient exhaust capacity, which limits the increase of fuel injection amount and causes poor low-speed torque performance, which is not conducive to the power performance of the automobile; and the turbocharger has aerodynamic lag phenomenon, which causes insufficient intake air volume of the engine under dynamic working condition and slow dynamic response of the engine.

[0006] In order to achieve the above technical purpose, the present application adopts the following technical scheme:

[0007] In a first aspect, the present application provides an auxiliary supercharging system, comprising:

[0008] a turbocharger, the air outlet of which is connected with the air intake manifold of the engine, and the air inlet of which is connected with the exhaust port of the engine;

[0009] The auxiliary unit comprises an air compressor, a dryer, a vehicle storage tank and a medium-pressure storage tank, the air outlet of the air compressor is connected to the air inlet of the dryer, the air outlet of the dryer is connected to the vehicle storage tank, and the vehicle storage tank is provided with a regeneration gas circuit, and the regeneration gas outlet of the regeneration gas circuit is connected to the medium-pressure storage tank, and the medium-pressure storage tank is connected to the vehicle storage tank and the air inlet manifold respectively; and

[0010] The valve group comprises a gas feeding valve and an adjusting valve, the gas feeding valve is arranged in the connecting pipeline between the medium-pressure storage tank and the air inlet manifold, and the adjusting valve is arranged in the connecting pipeline between the medium-pressure storage tank and the vehicle storage tank.

[0011] In some embodiments, the auxiliary supercharging system further comprises a multi-circuit protection valve arranged in the connecting pipeline between the air outlet of the dryer and the vehicle storage tank.

[0012] In some embodiments, the auxiliary supercharging system further comprises two pressure sensors arranged in the vehicle storage tank and the medium-pressure storage tank respectively, for monitoring the gas pressure in the vehicle storage tank and the medium-pressure storage tank.

[0013] In some embodiments, the gas pressure in the medium-pressure storage tank is P1, and the gas pressure in the vehicle storage tank is P2, and 0.4≤P1 / P2≤0.6 is satisfied.

[0014] In some embodiments, the auxiliary supercharging system further comprises an intercooler arranged in the connecting pipeline between the air outlet of the turbocharger and the air inlet manifold.

[0015] In some embodiments, the connecting pipeline between the medium-pressure storage tank and the air inlet manifold is a gas conveying pipeline;

[0016] The auxiliary unit further comprises an air nozzle, the inlet end of the air nozzle is connected to one end of the gas conveying pipeline close to the air inlet manifold, and the outlet end of the air nozzle is connected to the air inlet manifold.

[0017] In a second aspect, the present application further provides an auxiliary supercharging method for the auxiliary supercharging system as described in any one of the above embodiments, and the auxiliary supercharging method comprises the following steps:

[0018] obtaining the actual pressure of the gas in the vehicle storage tank, and determining the size of the actual pressure of the gas in the vehicle storage tank and the preset pressure of the gas in the vehicle storage tank;

[0019] when the actual pressure of the gas in the vehicle storage tank is greater than the preset pressure of the gas in the vehicle storage tank, controlling the dryer to start regeneration, and conveying the compressed air in the vehicle storage tank to the regeneration circuit of the dryer, and flowing into the medium-pressure storage tank through the regeneration gas outlet of the dryer;

[0020] acquire the actual working condition of the engine, and determine whether the actual working condition of the engine is in a preset working condition, and when the actual working condition of the engine is in the preset working condition, control the air feeding valve to open.

[0021] In some embodiments, the step of acquiring the actual pressure of the gas in the vehicle tank and determining the size of the actual pressure of the gas in the vehicle tank and the preset pressure of the gas in the vehicle tank further comprises:

[0022] When the actual pressure of the gas in the vehicle tank is less than the preset pressure of the gas in the vehicle tank, the air feeding valve and the adjusting valve are controlled to close, the air compressor is controlled to work to generate compressed gas, and the compressed gas is sent to the vehicle tank after being dried by the dryer until the pressure of the gas in the vehicle tank reaches the preset pressure.

[0023] Any one of the above, when the actual pressure of the gas in the vehicle tank is greater than the preset pressure of the gas in the vehicle tank, the dryer is controlled to start regeneration, and the compressed air in the vehicle tank is sent to the regeneration circuit of the dryer, and flows into the medium-pressure tank through the regeneration gas outlet of the dryer.

[0024] acquire the actual pressure of the gas in the medium-pressure tank, and determine the size of the actual pressure of the gas in the medium-pressure tank and the preset pressure of the gas in the medium-pressure tank;

[0025] When the actual pressure of the gas in the medium-pressure tank is greater than the preset pressure of the gas in the medium-pressure tank, the air feeding valve is controlled to open, and the adjusting valve is controlled to close.

[0026] In a third aspect, the application also provides a commercial vehicle comprising the auxiliary supercharging system according to any one of the above.

[0027] Compared with the prior art, in the auxiliary supercharging system provided by the application, when the pressure of the vehicle tank is less than the preset pressure during normal driving of the vehicle, the feedback pressure of the dryer becomes the ambient atmospheric pressure, the air compressor is activated to start air feeding, the compressed air generated by the air compressor enters the vehicle tank after being dried by the dryer, and when the pressure of the vehicle tank is greater than the preset pressure, the feedback pressure of the dryer becomes the pressure in the vehicle tank, the air compressor is activated to enter the internal unloading or disengagement state, and the air feeding is stopped.

[0028] When the pressure in the whole vehicle storage tank is greater than the set pressure, the feedback pressure of the dryer becomes the pressure in the whole vehicle storage tank, at which time the dryer is activated to start regeneration, and the compressed air in the whole vehicle storage tank enters the regeneration circuit of the dryer, flows out through the regeneration gas outlet, enters and is stored in the medium-pressure storage tank, so that the regeneration gas of the dryer is recycled. Meanwhile, the compressed gas in the medium-pressure storage tank can also be adjusted and supplemented through the whole vehicle high-pressure storage tank to maintain the pressure of the gas in the tank stable within a certain range, determine the effect of the regeneration of the dryer and the pressure requirement of the auxiliary injection.

[0029] Thus, when the engine is in a low-speed high-load working condition or a medium-low load transient working condition, the engine air intake is insufficient due to the response lag of the turbocharger, at which time the air supply valve can be opened to send the compressed air in the medium-pressure storage tank to the intake manifold to supplement the engine with additional air, improve the engine air intake, optimize the engine combustion process, and ultimately improve the engine economy.

[0030] Thus, when the engine is in a low-speed high-load working condition or a medium-low load transient working condition, the engine air intake is insufficient due to the response lag of the turbocharger, at which time the air supply valve can be opened to send the compressed air in the medium-pressure storage tank to the intake manifold to supplement the engine with additional air, improve the engine air intake, optimize the engine combustion process, and ultimately improve the engine economy. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of the auxiliary supercharging system provided by the embodiment of the present application;

[0032] Figure 2 is Figure 1 a schematic diagram of the auxiliary unit.

[0033] BRIEF DESCRIPTION OF DRAWINGS:

[0034] 1, turbocharger; 2, engine; 3, intake manifold; 4, auxiliary unit; 41, air compressor; 42, dryer; 43, whole vehicle storage tank; 44, medium-pressure storage tank; 5, air supply valve; 6, adjusting valve; 7, multi-circuit protection valve; 8, pressure sensor; 9, intercooler; 10, controller. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0036] In order to solve the technical problems of the turbocharged engine in the prior art, that is, the turbocharged engine has poor low-speed torque performance due to insufficient boost pressure caused by insufficient exhaust gas capacity, which limits the increase of fuel injection amount, and the turbocharger has a pneumatic lag phenomenon, which causes insufficient intake air amount of the engine in a dynamic working condition and slow dynamic response of the engine, the application provides an auxiliary supercharging system, which can improve the air supply of the engine, effectively improve the torque range in the low-speed range, improve the efficiency and responsiveness of the engine.

[0037] It should be noted that the auxiliary supercharging system described in the application is used in but not limited to commercial vehicles and the like, and in order to facilitate the description, in the application, only the application of the auxiliary supercharging system in commercial vehicles is taken as an example for description, and the principle of the application of the auxiliary supercharging system in other types of equipment is substantially the same as that in commercial vehicles, which will not be described here.

[0038] Please refer to Figure 1 and Figure 2 , Figure 1 and Figure 2 are structural schematic diagrams of the auxiliary supercharging system in an embodiment of the application, the auxiliary supercharging system comprises a turbocharger 1, an auxiliary unit 4 and a valve group; the gas outlet of the turbocharger 1 is communicated with the intake manifold 3 of an engine 2, and the gas inlet thereof is communicated with the exhaust port of the engine 2; the auxiliary unit 4 comprises an air compressor 41, a dryer 42, a vehicle storage tank 43 and a medium-pressure storage tank 44, the gas outlet of the air compressor 41 is communicated with the gas inlet of the dryer 42, the gas outlet of the dryer 42 is communicated with the vehicle storage tank 43, and the dryer 42 has a regenerative gas circuit, and the regenerative gas outlet thereof is communicated with the medium-pressure storage tank 44, and the medium-pressure storage tank 44 is respectively communicated with the vehicle storage tank 43 and the intake manifold 3; the valve group comprises a gas feeding valve 5 and an adjusting valve 6, the gas feeding valve 5 is arranged in the communication pipeline between the medium-pressure storage tank 44 and the intake manifold 3, and the adjusting valve 6 is arranged in the communication pipeline between the medium-pressure storage tank 44 and the vehicle storage tank 43.

[0039] In the auxiliary supercharging system provided by the application, when the pressure of the vehicle storage tank 43 is less than the set pressure for air charging under normal driving conditions of the vehicle, the feedback pressure of the dryer 42 becomes the ambient atmospheric pressure, the air compressor 41 is activated to start air charging, the compressed air generated by the air compressor 41 enters the vehicle storage tank 43 after being dried by the dryer 42, and when the pressure of the vehicle storage tank 43 is greater than the set pressure, the feedback pressure of the dryer 42 becomes the pressure in the vehicle storage tank 43, the air compressor 41 is activated to enter the internal unloading or disengagement state, and the air charging is stopped.

[0040] When the pressure in the vehicle tank 43 is greater than the set pressure, the feedback pressure of the dryer 42 becomes the pressure in the vehicle tank 43, at which time the dryer 42 is activated to start regeneration. The compressed air in the vehicle tank 43 enters the regeneration circuit of the dryer 42, flows out through the regeneration gas outlet, enters and is stored in the medium-pressure tank 44, and the regeneration gas of the dryer 42 is recovered. At the same time, the compressed gas in the medium-pressure tank 44 can also be adjusted and supplemented through the vehicle high-pressure tank to maintain the pressure of the gas in the tank stable within a certain range, determine the effect of the regeneration of the dryer 42 and the pressure requirement of the auxiliary injection.

[0041] In this way, when the engine 2 is in a low-speed high-load working condition or a medium-low load transient working condition, the engine 2 is insufficient in air intake due to the response lag of the turbocharger 1, at which time the air supply valve 5 can be opened to supply the compressed air in the medium-pressure tank 44 to the intake manifold 3 to supplement the engine 2 with additional air, improve the air intake of the engine 2, optimize the combustion process of the engine 2, and finally improve the economy of the engine 2.

[0042] Therefore, when the engine 2 is in a low-speed high-load area and a medium-low load transient working condition, the medium-pressure tank 44 cooperates with the turbocharger 1 by providing additional compressed air to improve the air supply of the engine 2, which can effectively improve the torque range in the low-speed area, improve the efficiency and responsiveness of the engine 2.

[0043] It should be noted that when the desiccant layer of the dryer 42 is regenerated, a part of the gas flowing through the dryer 42, i.e. the regeneration gas, is reduced in pressure and expanded. This pressure change makes the expanded gas drier, and then it flows through the desiccant layer to be regenerated (i.e. the desiccant layer that has absorbed a certain amount of water vapor). The dry regeneration gas absorbs the water in the desiccant and carries it out of the dryer 42, thereby achieving the purpose of dehumidification, which is a prior art and will not be described here.

[0044] In one embodiment, the auxiliary supercharging system further comprises a multi-circuit protection valve 7, which is arranged in the communication pipeline between the outlet of the dryer 42 and the vehicle tank 43.

[0045] In this embodiment, the multi-circuit protection valve 7 is arranged between the dryer 42 and the vehicle tank 43 to ensure that the bidirectional independent gas transmission between the dryer 42 and the vehicle tank 43 can be stably achieved. It should be noted that the specific structure and principle of the multi-circuit protection valve 7 are prior art and will not be described here.

[0046] In one embodiment, the auxiliary supercharging system further comprises two pressure sensors 8, which are respectively arranged in the vehicle tank 43 and the medium-pressure tank 44 to monitor the gas pressure in the vehicle tank 43 and the medium-pressure tank 44.

[0047] In the embodiment, the pressure in the whole vehicle storage tank 43 and the pressure in the medium pressure storage tank 44 are monitored in real time by two pressure sensors 8, so that the pressure in the medium pressure storage tank 44 is maintained within the design range by supplying air from the whole vehicle storage tank 43 to the medium pressure storage tank 44 according to the pressure in the whole vehicle storage tank 43, the pressure in the medium pressure storage tank 44 and the auxiliary injection requirement of the engine 2, and the intake manifold 3 is supplied with air according to the working condition of the engine 2.

[0048] In one of the embodiments, the pressure of the gas in the medium pressure storage tank 44 is P1, and the pressure of the gas in the whole vehicle storage tank 43 is P2, and 0.4≤P1 / P2≤0.6 is satisfied.

[0049] In the embodiment, the pressure in the medium pressure storage tank 44 is controlled to be 0.4-0.6 times of the pressure in the whole vehicle storage tank, which is the back pressure of the dryer 42 regeneration process, so that the gas in the dryer 42 regeneration process can flow through the dryer 42 at the critical gas speed, and the regeneration effect of the dryer 42 is ensured.

[0050] In one of the embodiments, the auxiliary supercharging system further comprises an intercooler 9, which is arranged in the communication pipeline between the gas outlet of the turbocharger 1 and the intake manifold 3.

[0051] In the embodiment, the intercooler 9 is arranged in the intake loop of the turbocharger 1, so as to flexibly adjust the temperature of the compressed air delivered by the turbocharger 1 into the engine 2.

[0052] In one of the embodiments, the communication pipeline between the medium pressure storage tank 44 and the intake manifold 3 is a gas conveying pipeline; the auxiliary unit 4 further comprises an air nozzle, the inlet end of the air nozzle is connected to one end of the gas conveying pipeline close to the intake manifold 3, and the outlet end of the air nozzle is connected to the intake manifold 3.

[0053] In the embodiment, the gas in the medium pressure storage tank 44 is conveyed to the intake manifold 3 through the air nozzle, so as to improve the flow rate and pressure of the conveyed gas. It should be noted that in one of the embodiments, the controller 10 determines the opening and closing of the adjusting valve 6 according to the airway requirement of the engine 2, the injection state, the power requirement condition and the pressure condition in the medium pressure storage tank 44.

[0054] In addition, the application further provides an auxiliary supercharging method for the auxiliary supercharging system as described above, and the first embodiment of the auxiliary supercharging method comprises the following steps:

[0055] The actual pressure of the gas in the whole vehicle storage tank 43 is obtained, and the actual pressure of the gas in the whole vehicle storage tank 43 and the preset pressure of the gas in the whole vehicle storage tank 43 are compared;

[0056] When the actual pressure of the gas in the vehicle tank 43 is greater than the preset pressure of the gas in the vehicle tank 43, the dryer 42 is controlled to start regeneration, and the compressed air in the vehicle tank 43 is sent to the regeneration circuit of the dryer 42, and flows into the medium-pressure tank 44 through the regeneration gas outlet of the dryer 42;

[0057] The actual working condition of the engine 2 is obtained, and it is determined whether the actual working condition of the engine 2 is in a preset working condition, and when the actual working condition of the engine 2 is in the preset working condition, the air supply valve 5 is controlled to be opened.

[0058] In this embodiment, when the pressure of the vehicle tank 43 is greater than the set pressure, the feedback pressure of the dryer 42 becomes the pressure of the vehicle tank 43, the dryer 42 is activated to start regeneration, and the compressed air in the vehicle tank 43 flows out and is stored in the medium-pressure tank 44 after entering the dryer 42. When the engine 2 is in a low-speed high-load working condition or a medium-low load transient working condition, the air supply valve 5 is opened to supply additional air to the engine 2, increase the air intake of the engine 2, optimize the combustion process of the engine 2, and finally improve the economy of the engine 2. It should be understood that the above-mentioned preset working condition of the engine 2 is that the engine 2 is in a low-speed high-load working condition or a medium-low load transient working condition.

[0059] In the second embodiment of the auxiliary supercharging method, the step of obtaining the actual pressure of the gas in the vehicle tank 43 and determining the size of the actual pressure of the gas in the vehicle tank 43 and the preset pressure of the gas in the vehicle tank 43 further comprises:

[0060] When the actual pressure of the gas in the vehicle tank 43 is less than the preset pressure of the gas in the vehicle tank 43, the air supply valve 5 and the adjusting valve 6 are controlled to be closed, and the air compressor 41 is controlled to work to generate compressed gas, which is sent to the vehicle tank 43 after being dried by the dryer 42, until the pressure of the gas in the vehicle tank 43 reaches the preset pressure.

[0061] In this embodiment, the air supply valve 5 and the adjusting valve 6 are closed by default; when the pressure of the vehicle tank 43 is less than the set pressure during normal driving of the vehicle, the feedback pressure of the dryer 42 becomes the ambient atmospheric pressure, the air compressor 41 is activated to start air charging, and the compressed air enters the vehicle tank 43 after being dried by the dryer 42; when the pressure of the vehicle tank 43 is greater than the set pressure, the feedback pressure of the dryer 42 becomes the pressure of the vehicle tank 43, the air compressor 41 is activated to enter the internal unloading or disengagement state, and the air charging is stopped.

[0062] In the third embodiment of the auxiliary supercharging method, the step of controlling the dryer 42 to start regeneration when the actual pressure of the gas in the vehicle tank 43 is greater than the preset pressure of the gas in the vehicle tank 43, and sending the compressed air in the vehicle tank 43 to the regeneration circuit of the dryer 42 and flowing into the medium-pressure tank 44 through the regeneration gas outlet of the dryer 42 is followed by:

[0063] The actual pressure of the gas in the medium-pressure tank 44 is obtained, and the actual pressure of the gas in the medium-pressure tank 44 is compared with the preset pressure of the gas in the medium-pressure tank 44.

[0064] When the actual pressure of the gas in the medium-pressure tank 44 is greater than the preset pressure of the gas in the medium-pressure tank 44, the air supply valve 5 is controlled to open, and the adjusting valve 6 is controlled to close.

[0065] In this embodiment, in order to ensure the effect of the regeneration of the dryer 42, the pressure in the medium-pressure tank 44 is monitored by the pressure sensor 8 on the medium-pressure tank 44 during the regeneration recovery process. When the pressure in the medium-pressure tank 44 exceeds the upper limit of the design, the air supply valve 5 is opened to release air to the intake manifold 3 of the engine 2, so as to actively reduce the pressure in the medium-pressure tank 44.

[0066] In addition, the application also provides a commercial vehicle, which comprises the auxiliary supercharging system according to any one of the above embodiments. It should be noted that the detailed structure of the auxiliary supercharging system of the commercial vehicle can refer to the above-mentioned embodiments of the auxiliary supercharging system, which will not be described here again. Since the above-mentioned auxiliary supercharging system is used in the commercial vehicle of the application, the embodiments of the commercial vehicle of the application include all the technical solutions of all the embodiments of the above-mentioned auxiliary supercharging system, and the technical effects achieved are also completely the same, which will not be described here again.

[0067] In order to better understand the application, the following will be combined with Figures 1 to 2 The technical solutions of the application will be described in detail:

[0068] The application increases a medium-pressure tank 44 to recover the compressed air used in the regeneration process of the dryer 42. The compressed gas in the medium-pressure tank comes from the recovery of the regeneration gas of the dryer 42, and is adjusted and supplemented by the high-pressure tank of the vehicle to maintain the pressure of the gas in the tank stable within a certain range.

[0069] Therefore, the air in the medium-pressure tank 44 can be used as auxiliary injection gas of the engine 2, so that the controller 10 can control the vehicle tank 43 to supplement the medium-pressure tank with air to maintain the pressure in the medium-pressure tank within the design range according to the pressure of the vehicle medium-pressure tank 44 and the auxiliary injection demand of the engine 2, and at the same time, according to the working condition of the engine 2, air is supplied to the intake pipe of the engine 2 to increase the intake amount of the engine 2, optimize the combustion process of the engine 2, and finally improve the economy of the engine 2.

[0070] The above description of the specific embodiments of the present application is not intended to limit the scope of the present application. Any other corresponding changes and modifications made according to the technical concept of the present application should be included in the scope of protection of the claims of the present application.

Claims

1. An auxiliary boosting system, characterized in that, include: A turbocharger whose outlet is connected to the intake manifold of the engine and whose intake port is connected to the exhaust port of the engine. The auxiliary unit includes an air compressor, a dryer, a vehicle storage tank, and an intermediate-pressure storage tank. The air compressor's outlet is connected to the dryer's inlet, the dryer's outlet is connected to the vehicle storage tank, and the dryer has a regeneration gas circuit with its regeneration gas outlet connected to the intermediate-pressure storage tank. The intermediate-pressure storage tank is connected to both the vehicle storage tank and the intake manifold. The valve assembly includes an air supply valve and an adjusting valve. The air supply valve is located in the connecting pipeline between the medium-pressure storage tank and the intake manifold, and the adjusting valve is located in the connecting pipeline between the medium-pressure storage tank and the vehicle storage tank. The gas pressure in the medium-pressure storage tank is P1, and the gas pressure in the vehicle storage tank is P2, satisfying 0.4≤P1 / P2≤0.

6. The medium-pressure storage tank serves as the back pressure for the regeneration process of the dryer, allowing the gas in the regeneration process to flow through the dryer at a critical gas velocity.

2. The auxiliary booster system according to claim 1, characterized in that, The auxiliary booster system also includes a multi-circuit protection valve, which is located in the connecting pipeline between the air outlet of the dryer and the vehicle storage tank.

3. The auxiliary booster system according to claim 1, characterized in that, The auxiliary boosting system also includes two pressure sensors, which are respectively located in the vehicle tank and the intermediate-pressure tank, to monitor the gas pressure in the vehicle tank and the intermediate-pressure tank.

4. The auxiliary booster system according to claim 1, characterized in that, The auxiliary boosting system also includes an intercooler, which is located in the connecting pipe between the outlet of the turbocharger and the intake manifold.

5. The auxiliary booster system according to claim 1, characterized in that, The connecting pipeline between the medium-pressure storage tank and the air intake manifold is a gas transmission pipeline; The auxiliary unit also includes an air nozzle, the inlet end of which is connected to one end of the air supply line near the intake manifold, and the outlet end of which is connected to the intake manifold.

6. An auxiliary boosting method, used in the auxiliary boosting system as described in any one of claims 1 to 5, characterized in that, The auxiliary boosting method includes the following steps: The actual pressure of the gas inside the vehicle's storage tank is obtained, and the magnitude of the actual pressure of the gas inside the vehicle's storage tank and the preset pressure of the gas inside the vehicle's storage tank are determined. When the actual pressure of the gas in the vehicle storage tank is greater than the preset pressure of the gas in the vehicle storage tank, the dryer is controlled to start regeneration, and the compressed air in the vehicle storage tank is sent to the regeneration circuit of the dryer and flows into the medium-pressure storage tank through the regeneration gas outlet of the dryer. The actual operating condition of the engine is obtained, and it is determined whether the actual operating condition of the engine is under a preset condition. When the actual operating condition of the engine is under the preset condition, the air supply valve is controlled to open.

7. The auxiliary boosting method according to claim 6, characterized in that, The step of obtaining the actual pressure of the gas inside the vehicle's storage tank and determining the magnitude of the actual pressure of the gas inside the vehicle's storage tank compared to the preset pressure of the gas inside the vehicle's storage tank further includes: When the actual pressure of the gas in the vehicle storage tank is less than the preset pressure of the gas in the vehicle storage tank, the gas supply valve and the adjusting valve are closed, and the air compressor is controlled to work to generate compressed gas. The compressed gas is then dried by the dryer and sent to the vehicle storage tank until the pressure of the gas in the vehicle storage tank reaches the preset pressure.

8. The auxiliary boosting method according to claim 6, characterized in that, The step of controlling the dryer to start regeneration when the actual pressure of the gas in the vehicle storage tank is greater than the preset pressure of the gas in the vehicle storage tank, and sending the compressed air in the vehicle storage tank to the regeneration circuit of the dryer, and then flowing into the medium-pressure storage tank through the regeneration gas outlet of the dryer, includes the following: The actual pressure of the gas inside the medium-pressure storage tank is obtained, and the magnitude of the actual pressure of the gas inside the medium-pressure storage tank and the preset pressure of the gas inside the medium-pressure storage tank are determined. When the actual pressure of the gas in the medium-pressure storage tank is greater than the preset pressure of the gas in the medium-pressure storage tank, the gas supply valve is opened and the regulating valve is closed.

9. A commercial vehicle, characterized in that, Includes the auxiliary booster system as described in any one of claims 1-5.

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