Auxiliary pressurization system, auxiliary pressurization method and commercial vehicle

Abstract

The invention 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, an air outlet of the turbocharger is communicated with an intake manifold of the engine, and an air inlet of the turbocharger is communicated with an 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, an air outlet of the air compressor is communicated with an air inlet of the dryer, an air outlet of the dryer is communicated with the whole vehicle storage tank and is provided with a regenerated gas loop, a regenerated gas outlet of the dryer is communicated with the medium-pressure storage tank, and the medium-pressure storage tank is communicated with the whole vehicle storage tank and an air inlet manifold; the valve set comprises an air supply valve and an adjusting valve, the air supply valve is arranged on a communicating pipeline of the medium-pressure storage tank and the air inlet manifold, and the adjusting valve is arranged on a communicating pipeline of the medium-pressure storage tank and the whole vehicle storage tank. According to the scheme, air supply of the engine can be improved, the torque range of a low-speed area can be effectively widened, and the efficiency and responsiveness of the engine are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engine air intake boosting systems, and in particular to an auxiliary boosting system, an auxiliary boosting method and a commercial vehicle. Background Art

[0002] The engine boost system usually adopts exhaust gas turbocharging technology, which is a technology that uses the exhaust gas generated by the engine to drive the compressor. Its purpose is to increase the engine intake volume without increasing the engine displacement, increase the engine equivalent compression ratio, and effectively improve the engine power density and torque density.

[0003] For example, patent CN206625890U discloses a turbocharged engine, which includes a cylinder, a compressor and a turbocharger. The compressor is connected to the air inlet of the cylinder through an air intake pipe to deliver compressed air to the cylinder; the compressor and the turbocharger are coaxially connected; the exhaust port of the cylinder is connected to the turbocharger through an exhaust gas discharge channel, and a sealed chamber connected to the cylinder is provided near the bottom of the crankshaft end of the cylinder. The sealed chamber is connected to the turbocharger through a pressure pipe, which can supplement the previous turbocharger system and complement each other. This further improves the power of the engine and the efficiency of fuel combustion.

[0004] However, when the turbocharged engine is running at low speed, the boost pressure is insufficient due to insufficient exhaust gas capacity, which limits the increase in fuel injection and causes poor low-speed torque performance, which is not conducive to the vehicle's power performance; and the turbocharger has aerodynamic lag, which leads to insufficient intake volume under dynamic engine conditions and slow dynamic engine response. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose an auxiliary boost system to solve the technical problems in the prior art that when a turbocharged engine has a low speed, the boost pressure is insufficient due to insufficient exhaust gas capacity, which limits the increase in fuel injection and causes poor low-speed torque performance, which is detrimental to the power performance of the vehicle; and the turbocharger has a pneumatic lag phenomenon, which leads to insufficient intake volume in dynamic conditions of the engine and slow dynamic response of the engine.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides an auxiliary boost system, comprising: A turbocharger, whose air outlet is connected to the intake manifold of the engine and whose air inlet is connected to the exhaust port of the engine; An auxiliary unit, comprising an air compressor, a dryer, a vehicle tank and a medium-pressure tank, wherein 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 tank, and has a regeneration gas circuit, and its regeneration gas outlet is connected to the medium-pressure tank, and the medium-pressure tank is respectively connected to the vehicle tank and the intake manifold; and The valve group includes an air supply valve and an adjusting valve. The air supply valve is arranged on the connecting pipeline between the medium-pressure storage tank and the intake manifold, and the adjusting valve is arranged on the connecting pipeline between the medium-pressure storage tank and the whole vehicle storage tank.

[0007] In some embodiments, the auxiliary boost system further includes a multi-circuit protection valve, which is disposed in a connecting pipeline between the air outlet of the dryer and the vehicle storage tank.

[0008] In some embodiments, the auxiliary boost system further includes two pressure sensors, which are respectively disposed in the whole vehicle storage tank and the medium pressure storage tank to monitor the gas pressure in the whole vehicle storage tank and the medium pressure storage tank.

[0009] 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, satisfying 0.4≤P1 / P2≤0.6.

[0010] In some embodiments, the auxiliary boost system further includes an intercooler, which is disposed in a communication pipeline between an air outlet of the turbocharger and the intake manifold.

[0011] In some embodiments, the connecting pipeline between the medium-pressure storage tank and the intake manifold is a gas transmission pipeline; The auxiliary unit further comprises an air nozzle, an inlet end of the air nozzle is connected to one end of the air delivery pipeline close to the intake manifold, and an outlet end of the air nozzle is connected to the intake manifold.

[0012] In a second aspect, the present invention further provides an auxiliary boosting method, which is used in the auxiliary boosting system as described in any one of the above, and the auxiliary boosting method comprises the steps of: Obtaining the actual pressure of the gas in the vehicle storage tank, and determining the difference between the actual pressure of the gas in the vehicle storage tank and the preset pressure of the gas in the vehicle storage tank; 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 transported 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 in a preset operating condition, and when the actual operating condition of the engine is in the preset operating condition, the air supply valve is controlled to open.

[0013] In some embodiments, after the step of obtaining the actual pressure of the gas in the vehicle storage tank and determining the difference between the actual pressure of the gas in the vehicle storage tank and the preset pressure of the gas in the vehicle storage tank, the step further includes: When the actual pressure of the gas in the whole vehicle storage tank is less than the preset pressure of the gas in the whole vehicle storage tank, the air supply valve and the regulating valve are controlled to be closed, and the air compressor is controlled to work to generate compressed gas, and the compressed gas is dried by the dryer and then transmitted to the whole vehicle storage tank until the pressure of the gas in the whole vehicle storage tank reaches the preset pressure.

[0014] According to any one of the above, 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 step of controlling the dryer to start regeneration and transmitting 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 comprises: Obtaining the actual pressure of the gas in the medium-pressure storage tank, and determining the difference between the actual pressure of the gas in the medium-pressure storage tank and the preset pressure of the gas in the medium-pressure storage tank; When the actual pressure of the gas in the tank of the mid-car is greater than the preset pressure of the gas in the tank of the mid-car, the air supply valve is controlled to open, and the regulating valve is controlled to close.

[0015] In a third aspect, the present invention further provides a commercial vehicle, comprising the auxiliary boost system as described in any one of the above.

[0016] Compared with the prior art, in the auxiliary boosting system provided by the present invention, when the vehicle is in normal driving conditions, after the pressure of the whole vehicle storage tank is lower than the set pressure for inflation, the feedback pressure of the dryer becomes the ambient atmospheric pressure, the air compressor is activated to start pumping air, and the compressed air generated by the air compressor enters the whole vehicle storage tank after being dried by the dryer, and when the pressure of the whole vehicle storage tank is higher than the set pressure, the feedback pressure of the dryer becomes the pressure inside the whole vehicle storage tank, the air compressor is activated to enter the internal unloading or disengagement state, and inflation is stopped.

[0017] When the pressure in the vehicle tank is greater than the set pressure, the feedback pressure of the dryer becomes the pressure in the vehicle tank, and the dryer is activated to start regeneration. The compressed air in the vehicle tank enters the regeneration circuit of the dryer, flows out through the regeneration gas outlet and enters and is stored in the medium-pressure tank, thus realizing the recovery of the dryer regeneration gas. At the same time, the compressed gas in the medium-pressure tank 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, and determine the effect of dryer regeneration and the pressure requirements of auxiliary injection.

[0018] In this way, when the engine is in a low-speed and high-load condition or a medium- and low-load transient condition, the engine intake volume is insufficient due to the delayed response of the turbocharger. At this time, the air supply valve can be opened to deliver the compressed air in the medium-pressure tank to the intake manifold, thereby adding additional air to the engine, increasing the engine intake volume, optimizing the engine combustion process, and ultimately improving the engine economy.

[0019] Therefore, when the engine is operating in the low-speed and high-load zone and the medium-to-low-load zone in transient conditions, the medium-pressure tank works in conjunction with the turbocharger by providing additional compressed air to improve the engine's air supply, which can effectively increase the torque range in the low-speed zone and improve engine efficiency and responsiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of an auxiliary boost system provided by an embodiment of the present invention; Figure 2 yes Figure 1 Schematic diagram of the auxiliary unit.

[0021] Description of reference numerals: 1. Turbocharger; 2. Engine; 3. Intake manifold; 4. Auxiliary unit; 41. Air compressor; 42. Dryer; 43. Vehicle storage tank; 44. Medium-pressure storage tank; 5. Air supply valve; 6. Adjustment valve; 7. Multi-circuit protection valve; 8. Pressure sensor; 9. Intercooler; 10. Controller. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] In order to solve the technical problems in the prior art that when a turbocharged engine has a low speed, the boost pressure is insufficient due to insufficient exhaust gas capacity, which limits the increase in fuel injection and causes poor low-speed torque performance, which is detrimental to the power performance of the vehicle; and the turbocharger has a pneumatic lag phenomenon, which leads to insufficient intake volume under dynamic conditions of the engine and slow dynamic response of the engine, the present invention provides an auxiliary boost system, which can improve the air supply to the engine, effectively increase the torque range in the low-speed zone, and improve the engine efficiency and responsiveness.

[0024] It should be noted that the auxiliary boost system described in the present invention is used for but not limited to commercial vehicles, etc. For the convenience of explanation, in the present invention, only the auxiliary boost system applied to a commercial vehicle is used as an example for explanation, and the principle of applying the auxiliary boost system to other types of equipment is essentially the same as that applied to a commercial vehicle, which will not be repeated here.

[0025] See also Figure 1 and Figure 2 , Figure 1 and Figure 2 It is a structural schematic diagram of an auxiliary supercharging system in an embodiment of the present invention, wherein the auxiliary supercharging system comprises a turbocharger 1, an auxiliary unit 4 and a valve group; the air outlet of the turbocharger 1 is connected to the intake manifold 3 of the engine 2, and its air inlet is connected to the exhaust port of the engine 2; the auxiliary unit 4 comprises an air compressor 41, a dryer 42, a vehicle tank 43 and a medium-pressure tank 44, the air outlet of the air compressor 41 is connected to the air inlet of the dryer 42, the air outlet of the dryer 42 is connected to the vehicle tank 43, and has a regeneration gas circuit, and its regeneration gas outlet is connected to the medium-pressure tank 44, and the medium-pressure tank 44 is respectively connected to the vehicle tank 43 and the intake manifold 3; the valve group comprises an air supply valve 5 and an adjusting valve 6, the air supply valve 5 is arranged in the connecting pipeline between the medium-pressure tank 44 and the intake manifold 3, and the adjusting valve 6 is arranged in the connecting pipeline between the medium-pressure tank 44 and the vehicle tank 43.

[0026] In the auxiliary boost system provided by the present invention, when the vehicle is in normal driving conditions, after the pressure of the vehicle tank 43 is lower than the set pressure for inflation, the feedback pressure of the dryer 42 becomes the ambient atmospheric pressure, the air compressor 41 is activated to start pumping air, and the compressed air generated by the air compressor 41 enters the vehicle tank 43 after being dried by the dryer 42. When the pressure of the vehicle tank 43 is higher than the set pressure, the feedback pressure of the dryer 42 becomes the pressure inside the vehicle tank 43, the air compressor 41 is activated to enter an internal unloading or disengagement state, and inflation is stopped.

[0027] 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, and 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, and determine the regeneration effect of the dryer 42 and the pressure requirement of the auxiliary injection.

[0028] In this way, when the engine 2 is in a low-speed and high-load condition or a medium-to-low load transient condition, the engine 2 has insufficient air intake due to the delayed response of the turbocharger 1. At this time, the air supply valve 5 can be opened to deliver the compressed air in the medium-pressure tank 44 to the intake manifold 3, thereby adding additional air to the engine 2, increasing the air intake of the engine 2, optimizing the combustion process of the engine 2, and ultimately improving the economy of the engine 2.

[0029] Therefore, when the engine 2 is in transient operating conditions in the low-speed and high-load area and the medium-to-low-load area, the medium-pressure tank 44 works in conjunction with the turbocharger 1 by providing additional compressed air to improve the air supply to the engine 2, thereby effectively improving the torque range in the low-speed area and improving the efficiency and responsiveness of the engine 2.

[0030] It should be noted that when the desiccant layer of the dryer 42 is regenerated, a portion of the gas flowing through the dryer 42, namely the regeneration gas, is decompressed and expanded. This pressure change makes the expanded gas drier, and then it is allowed to flow 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 moisture in the desiccant and takes it out of the dryer 42, thereby achieving the purpose of dehumidification. This is a prior art and will not be elaborated here.

[0031] In one of the embodiments, the auxiliary boost system further includes a multi-circuit protection valve 7 , which is disposed in a connecting pipeline between the air outlet of the dryer 42 and the vehicle storage tank 43 .

[0032] In this embodiment, a multi-circuit protection valve 7 is provided between the dryer 42 and the vehicle storage tank 43 to ensure stable bidirectional independent gas transmission between the dryer 42 and the vehicle storage tank 43. It should be noted that the specific structure and principle of the multi-circuit protection valve 7 are prior art and will not be elaborated here.

[0033] In one embodiment, the auxiliary boost system further includes two pressure sensors 8 , which are respectively disposed in the vehicle storage tank 43 and the medium-pressure storage tank 44 to monitor the gas pressure in the vehicle storage tank 43 and the medium-pressure storage tank 44 .

[0034] In this embodiment, two pressure sensors 8 are used to monitor the air pressure in the vehicle tank 43 and the medium-pressure tank 44 in real time, so as to flexibly control the vehicle tank 43 to replenish air to the medium-pressure tank 44 according to the pressure of the vehicle tank 43, the pressure of the medium-pressure tank 44 and the auxiliary injection demand of the engine 2 to maintain the pressure in the medium-pressure tank within the designed range, and also to pump air into the intake manifold 3 of the engine 2 according to the working condition of the engine 2.

[0035] In one embodiment, the gas pressure in the medium-pressure storage tank 44 is P1, and the gas pressure in the vehicle storage tank 43 is P2, satisfying 0.4≤P1 / P2≤0.6.

[0036] In this embodiment, the pressure of the medium-pressure storage tank 44 is controlled at 0.4 to 0.6 times that of the vehicle's gas tank as the back pressure during the regeneration process of the dryer 42, so that the gas during the regeneration process of the dryer 42 can flow through the dryer 42 at a critical gas velocity, thereby ensuring the regeneration effect of the dryer 42.

[0037] In one embodiment, the auxiliary supercharging system further includes an intercooler 9 , which is disposed in a communication pipeline between an air outlet of the turbocharger 1 and the intake manifold 3 .

[0038] In this embodiment, an intercooler 9 is provided on the intake circuit of the turbocharger 1 to flexibly adjust the temperature of the compressed air delivered by the turbocharger 1 to the engine 2 .

[0039] In one embodiment, the connecting pipeline between the medium-pressure storage tank 44 and the intake manifold 3 is an air supply pipeline; the auxiliary unit 4 also includes an air nozzle, the inlet end of the air nozzle is connected to one end of the air supply pipeline close to the intake manifold 3, and the outlet end thereof is connected to the intake manifold 3.

[0040] In this embodiment, the gas in the medium-pressure tank 44 is delivered to the intake manifold 3 via the air nozzle to increase the flow rate and pressure of the delivered gas. It should be noted that in one embodiment, the controller 10 determines the opening and closing of the regulating valve 6 according to the airway requirements, injection state, power requirements of the engine 2 and the pressure in the medium-pressure tank 44.

[0041] In addition, the present invention also provides an auxiliary supercharging method, which is used in the auxiliary supercharging system as described above. A first embodiment of the auxiliary supercharging method includes the following steps: Obtaining the actual pressure of the gas in the vehicle storage tank 43, and determining the difference between the actual pressure of the gas in the vehicle storage tank 43 and the preset pressure of the gas in the vehicle storage tank 43; When the actual pressure of the gas in the vehicle storage tank 43 is greater than the preset pressure of the gas in the vehicle storage tank 43, the dryer 42 is controlled to start regeneration, and the compressed air in the vehicle storage tank 43 is transported to the regeneration circuit of the dryer 42, and flows into the medium-pressure storage tank 44 through the regeneration gas outlet of the dryer 42; 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 the preset working condition. When the actual working condition of the engine 2 is in the preset working condition, the air supply valve 5 is controlled to open.

[0042] 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 in the vehicle tank 43, the dryer 42 is activated to start regeneration, and the compressed air in the vehicle tank 43 enters the dryer 42 and flows out into and is stored in the medium-pressure tank 44. When the engine 2 is in a low-speed and high-load condition or a medium-low load transient condition, the air supply valve 5 is opened to add additional air to the engine 2, increase the intake volume of the engine 2, optimize the combustion process of the engine 2, and ultimately improve the economy of the engine 2. It should be understood that the preset working condition of the engine 2 is that the engine 2 is in a low-speed and high-load condition or a medium-low load transient condition.

[0043] In the second embodiment of the auxiliary boosting method, after the step of obtaining the actual pressure of the gas in the vehicle storage tank 43 and determining the difference between the actual pressure of the gas in the vehicle storage tank 43 and the preset pressure of the gas in the vehicle storage tank 43, the following steps are further included: When the actual pressure of the gas in the vehicle storage tank 43 is less than the preset pressure of the gas in the vehicle storage tank 43, the air supply valve 5 and the regulating valve 6 are controlled to be closed, and the air compressor 41 is controlled to work to generate compressed gas, and the compressed gas is dried by the dryer 42 and then transmitted to the vehicle storage tank 43 until the pressure of the gas in the vehicle storage tank 43 reaches the preset pressure.

[0044] In this embodiment, the air supply valve 5 and the regulating valve 6 are closed by default; when the vehicle is in normal driving conditions, when the pressure of the vehicle tank 43 is less than the set pressure for inflation, the feedback pressure of the dryer 42 becomes the ambient atmospheric pressure, the air compressor 41 is activated to start air supply, 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 inflation is stopped.

[0045] In the third embodiment of the auxiliary boosting method, when the actual pressure of the gas in the vehicle storage tank 43 is greater than the preset pressure of the gas in the vehicle storage tank 43, the step of controlling the dryer 42 to start regeneration, and transmitting the compressed air in the vehicle storage tank 43 to the regeneration circuit of the dryer 42, and flowing into the medium-pressure storage tank 44 through the regeneration gas outlet of the dryer 42 includes: Obtain the actual pressure of the gas in the medium-pressure storage tank 44, and determine the difference between the actual pressure of the gas in the medium-pressure storage tank and the preset pressure of the gas in the medium-pressure storage tank; When the actual pressure of the gas in the tank of the middle vehicle is greater than the preset pressure of the gas in the tank of the middle vehicle, the air supply valve 5 is controlled to open, and the regulating valve 6 is controlled to close.

[0046] In this embodiment, in order to ensure the regeneration effect 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 and recovery process. When the pressure in the medium-pressure tank 44 exceeds the design upper limit, 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.

[0047] In addition, the present invention further provides a commercial vehicle, which includes the auxiliary supercharging system as described in any one of the above. It should be noted that the detailed structure of the auxiliary supercharging system of the commercial vehicle can refer to the embodiment of the auxiliary supercharging system described above, which will not be repeated here; since the auxiliary supercharging system described above is used in the commercial vehicle of the present invention, the embodiment of the commercial vehicle of the present invention includes all technical solutions of all embodiments of the auxiliary supercharging system described above, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0048] In order to better understand the present invention, the following Figure 1 to Figure 2 The technical solution of the present invention is described in detail: The present invention adds a medium-pressure storage tank 44 to recover and store the compressed air used in the regeneration process of the dryer 42. The compressed gas in the medium-pressure gas storage tank comes from the recovery of the regeneration gas of the dryer 42, and is adjusted and supplemented by the high-pressure gas storage tank of the whole vehicle to maintain the pressure of the gas in the tank stable within a certain range.

[0049] In this way, the air in the medium-pressure tank 44 can be used as the auxiliary injection gas of the engine 2, so that the controller 10 can control the vehicle tank 43 to replenish air to the medium-pressure gas tank according to the pressure of the medium-pressure tank 44 of the whole vehicle and the auxiliary injection requirements of the engine 2 to maintain the pressure in the medium-pressure tank within the design range, and at the same time, pump air into the intake pipe of the engine 2 according to the working conditions of the engine 2, thereby increasing the intake volume of the engine 2, optimizing the combustion process of the engine 2, and ultimately improving the economy of the engine 2.

[0050] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An auxiliary boost system, characterized in that: include: A turbocharger, whose air outlet is connected to the intake manifold of the engine and whose air inlet is connected to the exhaust port of the engine; An auxiliary unit, comprising an air compressor, a dryer, a vehicle tank and a medium-pressure tank, wherein 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 tank, and has a regeneration gas circuit, and its regeneration gas outlet is connected to the medium-pressure tank, and the medium-pressure tank is respectively connected to the vehicle tank and the intake manifold; and The valve group includes an air supply valve and an adjusting valve. The air supply valve is arranged on the connecting pipeline between the medium-pressure storage tank and the intake manifold, and the adjusting valve is arranged on the connecting pipeline between the medium-pressure storage tank and the whole vehicle storage tank.

2. The auxiliary boost system according to claim 1, characterized in that: The auxiliary boost system further comprises a multi-circuit protection valve, which is arranged in a connecting pipeline between the air outlet of the dryer and the whole vehicle storage tank.

3. The auxiliary boost system according to claim 1, characterized in that: The auxiliary boost system also includes two pressure sensors, which are respectively arranged in the whole vehicle storage tank and the medium-pressure storage tank to monitor the gas pressure in the whole vehicle storage tank and the medium-pressure storage tank.

4. The auxiliary boost system according to claim 1, characterized in that: 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.

5. The auxiliary boost system according to claim 1, characterized in that: The auxiliary supercharging system further includes an intercooler, which is arranged in a communication pipeline between an air outlet of the turbocharger and the intake manifold.

6. The auxiliary boost system according to claim 1, characterized in that: The connecting pipeline between the medium-pressure storage tank and the intake manifold is a gas transmission pipeline; The auxiliary unit further comprises an air nozzle, an inlet end of the air nozzle is connected to one end of the air delivery pipeline close to the intake manifold, and an outlet end of the air nozzle is connected to the intake manifold.

7. An auxiliary supercharging method, used in the auxiliary supercharging system according to any one of claims 1 to 6, characterized in that: The auxiliary boosting method comprises the steps of: Obtaining the actual pressure of the gas in the vehicle storage tank, and determining the difference between the actual pressure of the gas in the vehicle storage tank and the preset pressure of the gas in the vehicle storage tank; 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 transported 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 in a preset operating condition, and when the actual operating condition of the engine is in the preset operating condition, the air supply valve is controlled to open.

8. The auxiliary boosting method according to claim 7, characterized in that: After the step of obtaining the actual pressure of the gas in the vehicle storage tank and determining the difference between the actual pressure of the gas in the vehicle storage tank and the preset pressure of the gas in the vehicle storage tank, the following steps are further included: When the actual pressure of the gas in the whole vehicle storage tank is less than the preset pressure of the gas in the whole vehicle storage tank, the air supply valve and the regulating valve are controlled to be closed, and the air compressor is controlled to work to generate compressed gas, and the compressed gas is dried by the dryer and then transmitted to the whole vehicle storage tank until the pressure of the gas in the whole vehicle storage tank reaches the preset pressure.

9. The auxiliary boosting method according to claim 7, 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 transmitting 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 comprises: Obtaining the actual pressure of the gas in the medium-pressure storage tank, and determining the difference between the actual pressure of the gas in the medium-pressure storage tank and the preset pressure of the gas in the medium-pressure storage tank; When the actual pressure of the gas in the tank of the mid-car is greater than the preset pressure of the gas in the tank of the mid-car, the air supply valve is controlled to open, and the regulating valve is controlled to close.

10. A commercial vehicle, characterized in that: It comprises the auxiliary boost system as described in any one of claims 1-6.

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