Auxiliary pressurization system, auxiliary pressurization method and commercial vehicle

Abstract

The invention discloses an auxiliary pressurization system, an auxiliary pressurization method and a commercial vehicle. The auxiliary pressurization system comprises a turbocharger, a gas storage unit, a compensation pipe and a compensation valve. An air outlet of the turbocharger is used for communicating with an intake manifold of an engine, and an air inlet of the turbocharger communicates with an exhaust port of the engine; the air storage unit comprises an air compressor, an air delivery pipe, a storage tank and an air delivery valve, an air outlet of the air compressor, the air delivery pipe, the storage tank and the intake manifold are sequentially communicated, and the air delivery valve is arranged on a communicating pipeline between the storage tank and the intake manifold; the compensation pipe is communicated with the gas conveying pipe and the gas inlet manifold; and the compensation valve is arranged between the compensation pipe and the gas conveying pipe, has a first state for controlling the on-off of the gas conveying pipe and cutting off the compensation pipe, and has a second state for intercepting fluid in the gas conveying pipe to the compensation pipe. According to the scheme, the problems of starting lag and insufficient low-speed air inflow of the turbocharger can be solved, then the engine performance is improved, and the economical efficiency of the whole vehicle is improved.

Description

Technical Field

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

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

[0003] For example, patent CN207728435U discloses a turbocharger and an engine, wherein at least two flow channels of the turbocharger are asymmetrically formed inside a turbine housing and are connected to a cavity fluid for receiving cylinder exhaust of the engine; at least one valve is configured to selectively close, partially open or fully open at least one of the at least two flow channels leading to the cavity, and has the advantages of compact structure, easy manufacturing, economical and durable, and moderate cost, and can simultaneously meet the driving EGR and engine performance requirements, thereby effectively reducing engine pollutant emissions.

[0004] However, general turbocharged engines have insufficient exhaust gas capacity at low speeds, resulting in insufficient boost pressure, limiting the increase in fuel injection and causing poor low-speed torque performance, which is detrimental to the vehicle's power performance. At the same time, the turbocharger has a start-up lag, resulting in insufficient intake volume under dynamic engine conditions and slow engine dynamic 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 the turbocharged engine has insufficient exhaust gas capacity at low speeds, resulting in insufficient boost pressure, limiting the increase in fuel injection, resulting in poor low-speed torque performance, which is detrimental to the power performance of the vehicle. At the same time, the turbocharger has a starting lag phenomenon, resulting in insufficient intake volume under 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, the air outlet of which is connected to the intake manifold of the engine, and the air inlet of which is connected to the exhaust port of the engine; An air storage unit, comprising an air compressor, an air delivery pipe, a storage tank and an air delivery valve, wherein the air outlet of the air compressor, the air delivery pipe, the storage tank and the intake manifold are sequentially connected, and the air delivery valve is arranged in the connecting pipeline between the storage tank and the intake manifold; a compensating pipe, connecting the air delivery pipe and the intake manifold; and The compensating valve is arranged between the compensating pipe and the gas pipe, and has a first state of controlling the on-off of the gas pipe and cutting off the compensating pipe, and a second state of cutting off the fluid in the gas pipe to the compensating pipe.

[0007] In some embodiments, the compensation valve is a compensation three-way valve, and the compensation three-way valve is arranged between the gas transmission pipe and the compensation pipe; or, The compensation valve includes two opening valves, one of which is arranged on the gas transmission pipe and located between the compensation pipe and the storage tank, and the other is arranged on the compensation pipe.

[0008] In some embodiments, the auxiliary boost system further includes a dryer having a gas drying circuit, wherein the gas drying circuit is disposed in the gas supply pipe and is located between the compensation valve and the storage tank.

[0009] In some embodiments, the air compressor has a feedback pipe, and when the fluid pressure received by the feedback pipe reaches a preset value, the air compressor is controlled to enter an internal unloading or disengaging state; The dryer also has a regeneration gas circuit and a feedback pressure circuit. The inlet ends of the regeneration gas circuit and the feedback pressure circuit are respectively connected to one end of the gas pipeline close to the storage tank, and the outlet end of the feedback pressure circuit is connected to the feedback pipe.

[0010] In some embodiments, the auxiliary boost system further includes a feedback three-way valve, which is disposed on the feedback pipe and has a first channel for controlling the on-off of the feedback pipe and a second channel for controlling the on-off of the feedback pipe and the external environment.

[0011] In some embodiments, the auxiliary boost system also includes a regulating pipe and a regulating three-way valve, one end of the regulating pipe is connected to the storage tank, and the other end is connected to the feedback pipe, and is located between the feedback three-way valve and the dryer, and the regulating three-way valve is arranged between the regulating pipe and the feedback pipe.

[0012] In some embodiments, the gas storage unit further includes a multi-circuit protection valve, which is disposed on the gas pipeline and located between the dryer and the storage tank.

[0013] In some embodiments, the gas storage unit further includes a pressure sensor, which is disposed in the storage tank and is used to monitor the gas pressure in the storage tank.

[0014] In addition, the present invention also provides an auxiliary supercharging method, which is used in the auxiliary supercharging system as described in any one of the above, and the auxiliary supercharging method comprises the steps of: Acquiring the actual operating condition of the engine, and determining whether the actual operating condition of the engine is within a preset operating condition; When the actual working condition of the engine is in the preset working condition, the gas delivery valve is controlled to open, and the compensation valve is controlled to switch to the second state; obtaining the amount of air delivered from the storage tank to the intake manifold; When the air provided to the intake manifold via the storage tank meets the demand of the engine, the air delivery valve is controlled to close, and when the actual operating condition of the engine deviates from the preset operating condition, the compensation valve is controlled to switch to the first state.

[0015] In addition, the present invention also provides a commercial vehicle, which includes the auxiliary boosting system as described in any one of the above items.

[0016] Compared with the prior art, in the auxiliary supercharging system provided by the present invention, additional air flow is provided to the intake manifold through high- and low-pressure air pipelines to be sprayed into the engine, wherein the high-pressure air is provided by a storage tank, and the low-pressure air is directly compressed by an air compressor. The high-pressure air from the storage tank has high injection time accuracy and flow accuracy, and can accurately provide the required additional air in the first time according to the engine demand, but because the storage tank pressure is high, the power consumption of the air compressor is also relatively high; and the low-pressure injection directly provided by the air compressor is not as timely and accurate as the high-pressure injection, but because the back pressure of the air compressor is much lower than that of the storage tank, the power consumption of the air compressor is lower. Therefore, timely and accurate injection compensation and lower air compressor power consumption can be achieved through the coordinated injection of high and low pressures, thereby achieving the purpose of optimizing the use of compressed air for the entire vehicle.

[0017] In this way, the air storage unit, compensation pipe and turbocharger can work together to improve the problems of turbocharger start-up lag and insufficient low-speed air intake, thereby improving engine performance; and in the auxiliary injection process, the medium and high pressure air of the vehicle's air storage system and the relatively low-pressure air directly generated by the air compressor are used in a coordinated manner to further improve the economy of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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, compensation pipe and compensation valve; Figure 3 is a schematic diagram of an auxiliary boost system provided by another embodiment of the present invention; Figure 4 yes Figure 3 Schematic diagram of the auxiliary unit, compensation pipe and compensation valve.

[0019] Description of reference numerals: 1. Turbocharger; 2. Engine; 21. Intake manifold; 3. Air storage unit; 31. Air compressor; 32. Air pipe; 33. Storage tank; 331. High-pressure nozzle; 34. Air valve; 35. Dryer; 36. Feedback pipe; 37. Feedback three-way valve; 38. Control pipe; 39. Control three-way valve; 4. Compensation pipe; 41. Low-pressure nozzle; 5. Compensation valve; 51. Compensation three-way valve; 52. Opening valve; 6. Multi-circuit protection valve; 7. Pressure sensor; 8. Controller. DETAILED DESCRIPTION

[0020] 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.

[0021] In order to solve the technical problems in the prior art that the turbocharged engine has insufficient exhaust gas capacity at low speed, resulting in insufficient boost pressure, limiting the increase in fuel injection, causing poor low-speed torque performance, which is unfavorable to the power performance of the car, and at the same time, the turbocharger has a starting lag phenomenon, resulting in insufficient engine dynamic operating condition intake volume and slow engine dynamic response, the present invention provides an auxiliary boosting system, which can adopt an air storage unit, a compensation pipe and a turbocharger to work together to improve the problems of turbocharger starting lag and insufficient low-speed intake volume, thereby improving engine performance; and in the auxiliary injection process, the medium and high pressure air of the vehicle air storage system and the relatively low pressure air directly generated by the air compressor are used in a coordinated manner to further improve the economy of the vehicle.

[0022] 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.

[0023] See also Figure 1 and Figure 2 , Figure 1 and Figure 21 is a schematic diagram of the structure of an auxiliary supercharging system in an embodiment of the present invention, wherein the auxiliary supercharging system comprises a turbocharger 1, an air storage unit 3, a compensating pipe 4 and a compensating valve 5; an air outlet of the turbocharger 1 is used to connect to the intake manifold 21 of the engine 2, and the air inlet is connected to the exhaust port of the engine 2; the air storage unit 3 comprises an air compressor 31, an air supply pipe 32, a storage tank 33 and an air supply valve 34, the air outlet of the air compressor 31, the air supply pipe 32, the storage tank 33 and the intake manifold 21 are connected in sequence, and the air supply valve 34 is arranged in the connecting pipeline between the storage tank 33 and the intake manifold 21; the compensating pipe 4 connects the air supply pipe 32 and the intake manifold 21; the compensating valve 5 is arranged between the compensating pipe 4 and the air supply pipe 32, and has a first state of controlling the on-off of the air supply pipe 32 and cutting off the compensating pipe 4, and has a second state of cutting off the fluid in the air supply pipe 32 to the compensating pipe 4.

[0024] In the auxiliary supercharging system provided by the present invention, an additional air flow is provided to the intake manifold 21 through high and low pressure air pipelines to be sprayed into the engine 2, wherein the high pressure air is provided by the storage tank 33, and the low pressure air is directly compressed by the air compressor 31. The high pressure air from the storage tank 33 has high injection time accuracy and flow accuracy, and can accurately provide the required additional air in the first time according to the needs of the engine 2, but because the pressure of the storage tank 33 is high, the power consumption of the air compressor 31 is relatively high; while the low pressure injection directly provided by the air compressor 31 is not as timely and accurate as the high pressure injection, but because the back pressure of the air compressor 31 is much lower than that of the storage tank 33, the power consumption of the air compressor 31 is low. Therefore, timely and accurate injection compensation and low power consumption cost of the air compressor 31 can be achieved through the coordinated injection of high and low pressures, so as to achieve the purpose of optimizing the use of compressed air for the whole vehicle.

[0025] In this way, the air storage unit 3, the compensation pipe 4 and the turbocharger 1 can work together to improve the problems of start-up lag and insufficient low-speed air intake of the turbocharger 1, thereby improving the performance of the engine 2; and in the auxiliary injection process, the medium and high pressure air of the vehicle's air storage system and the relatively low-pressure air directly generated by the air compressor 31 are used in a coordinated manner to further improve the economy of the vehicle.

[0026] It should be noted that 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, additional air is added to the engine 2 intake pipe through the high-pressure pipe and the low-pressure pipe to increase the engine 2 intake, optimize the engine 2 combustion process, and ultimately improve the economy of the engine 2.

[0027] In one embodiment, see Figure 1 and Figure 2 The compensation valve 5 is a compensation three-way valve 51 , and the compensation three-way valve 51 is arranged between the gas transmission pipe 32 and the compensation pipe 4 .

[0028] In this embodiment, the compensation valve 5 is set to be in the form of a three-way valve. The compensation three-way valve 51 is in the first state in the default state, and connects the air compressor 31 and the storage tank 33; and when switching to the second state, one end of the air supply pipe 32 connected to the storage tank 33 is cut off, and the compressed air generated by the air compressor 31 is delivered to the compensation pipe 4.

[0029] In another embodiment, see Figure 3 and Figure 4 The compensation valve 5 includes two opening valves 52 , one of the two opening valves 52 is arranged on the gas transmission pipe 32 and is located between the compensation pipe 4 and the storage tank 33 , and the other is arranged on the compensation pipe 4 .

[0030] In this embodiment, the compensation valve 5 is configured as two independently controlled opening valves 52. In a default state, the opening valve 52 on the compensation pipe 4 is in a closed state, while the opening valve 52 on the gas pipe 32 is in an open state.

[0031] In addition, it should be noted that, in one embodiment, a high-pressure nozzle 331 is provided at one end of the storage tank 33 connected to the intake manifold 21 , and similarly, a low-pressure nozzle 41 is provided at one end of the compensation pipe 4 connected to the intake manifold 21 .

[0032] In one embodiment, the auxiliary boost system further includes a dryer 35 . The dryer 35 has a gas drying circuit. The gas drying circuit is disposed in the gas supply pipe 32 and is located between the compensation valve 5 and the storage tank 33 .

[0033] In this embodiment, a dryer 35 is provided between the air compressor 31 and the storage tank 33, and a gas drying circuit of the dryer 35 is provided on the gas delivery pipe 32, so that the gas delivered from the air compressor 31 can be dried through the gas drying circuit and then delivered to the storage tank 33, so as to ensure that the compressed air stored in the storage tank 33 is dry, and further improve the working performance of the engine 2. It should be noted that the specific structure and principle of the dryer 35 are prior art and will not be elaborated here.

[0034] In one embodiment, the air compressor 31 has a feedback pipe 36, which controls the air compressor 31 to enter an internal unloading or disengagement state when the fluid pressure it receives reaches a preset value; the dryer 35 also has a regeneration gas circuit and a feedback pressure circuit, and the inlet ends of the regeneration gas circuit and the feedback pressure circuit are respectively connected to one end of the gas supply pipe 32 close to the storage tank 33, and the outlet end of the feedback pressure circuit is connected to the feedback pipe 36.

[0035] In this embodiment, a feedback mechanism is provided between the dryer 35 and the air compressor 31. Specifically, when the vehicle is in normal driving condition, when the pressure of the storage tank 33 is lower than the set pressure for inflation, the feedback pressure of the dryer 35 becomes the ambient atmospheric pressure, the air compressor 31 is activated to start to pump air, and the compressed air enters the storage tank 33 after passing through the dryer 35. When the pressure of the storage tank 33 is higher than the set pressure of the gas tank, the feedback pressure of the dryer 35 becomes the pressure inside the gas tank, the air compressor 31 is activated to enter the internal unloading or disengagement state, and inflation stops.

[0036] It should be noted that when the desiccant layer of the dryer 35 is regenerated, a portion of the gas flowing through the dryer 35, namely the regeneration gas, is decompressed and expanded. This pressure change makes the expanded gas drier, and then allows it 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 35, thereby achieving the purpose of dehumidification. This is a prior art and will not be elaborated here.

[0037] In one embodiment, the auxiliary boost system further includes a feedback three-way valve 37, which is disposed on the feedback pipe 36 and has a first channel for controlling the on-off of the feedback pipe 36 and a second channel for controlling the on-off of the feedback pipe 36 and the external environment.

[0038] In this embodiment, the feedback three-way valve 37 is set on the feedback pipe 36 as above. Based on this, the process of joint injection when the air compressor 31 is in an empty unloading or disengaged state is as follows: the air compressor 31 is in an internal unloading or disengaged state. When the working conditions of the whole vehicle and the engine 2 require compressed air injection compensation, the controller 8 opens the air delivery valve 34, and the high-pressure air in the storage tank 33 is injected at high pressure through the high-pressure nozzle 331. The feedback three-way valve 37 is controlled to switch to the second channel, and the feedback pipe 36 of the air compressor 31 is connected to the atmosphere, and the air compressor 31 is activated to start pumping. The compensation three-way valve 51 is controlled to connect the air outlet of the air compressor 31 with the low-pressure nozzle 41, so that the compressed gas generated by the air machine is injected at low pressure through the low-pressure nozzle 41.

[0039] The high-pressure jet accurately and timely provides the air required by the engine 2 in the early stage of injection, then exits, the air delivery valve 34 is closed, and the subsequent required air is continuously provided by the low-pressure jet until the injection demand ends. The feedback three-way valve 37 returns to the default state, that is, switches to the first channel, and connects the original feedback air path of the air compressor 31 and the dryer 35; the compensation three-way valve 51 returns to the default state, connecting the outlet of the air compressor 31 and the inlet of the dryer 35; the pressure in the storage tank 33 at the end of the jet automatically determines whether the air compressor 31 re-enters the internal unloading or disengagement state or starts to inflate the air tank.

[0040] In one embodiment, the auxiliary boost system also includes a regulating pipe 38 and a regulating three-way valve 39. One end of the regulating pipe 38 is connected to the storage tank 33, and the other end is connected to the feedback pipe 36. The regulating pipe 38 is located between the feedback three-way valve 37 and the dryer 35. The regulating three-way valve 39 is arranged between the regulating pipe 38 and the feedback pipe 36.

[0041] In this embodiment, a regulating three-way valve 39 is also provided as above to control the air compressor 31 to actively stop and pump air, and to adjust the regeneration ratio of the dryer 35 . In the prior art, each time the storage tank 33 reaches the maximum pressure, the dryer 35 is activated for regeneration, which causes a certain degree of waste of high-pressure air in the storage tank 33 of the vehicle. In the present invention, the frequency of regeneration of the dryer 35 can be controlled by adjusting the state of each valve to achieve the purpose of saving gas. The process is as follows: the controller 8 monitors the air flow rate of the air compressor 31 to the dryer 35. When the passing air flow rate is lower than the regeneration limit of the dryer 35, during the air compressor 31 pumping process, when the storage tank 33 is nearly full and the pressure has not reached the maximum pressure set by the gas tank, the controller 8 switches the feedback three-way valve 37 and the regulating three-way valve 39 to connect and maintain the feedback pipe 36 of the air compressor 31 to the storage tank 33, and the air compressor 31 enters the internal unloading or disengagement state under the high-pressure excitation of the feedback pipe 36; until the air compressor 31 pumps air to the gas tank again and the air flow rate through the dryer 35 reaches the regeneration limit, the dryer 35 is activated for regeneration.

[0042] In one embodiment, the gas storage unit 3 further includes a multi-circuit protection valve 6 , which is disposed on the gas delivery pipe 32 and located between the dryer 35 and the storage tank 33 .

[0043] In this embodiment, a multi-circuit protection valve 6 is further provided between the dryer 35 and the storage tank 33 to improve the stability of gas flow between the circuits. It should be noted that the specific structure and principle of the multi-circuit protection valve 6 are prior art and will not be described in detail here.

[0044] In one embodiment, the gas storage unit 3 further includes a pressure sensor 7 , which is disposed in the storage tank 33 and is used to monitor the gas pressure in the storage tank 33 .

[0045] In this embodiment, a pressure sensor 7 is provided on the storage tank 33 to monitor the pressure in the storage tank 33 in real time, so as to ensure that a fixed amount of compressed air is stored in the storage tank 33 .

[0046] In addition, the present invention also provides an auxiliary supercharging method, which is used in the auxiliary supercharging system as described above, and the auxiliary supercharging method comprises the steps of: Obtaining the actual operating condition of the engine 2, and determining whether the actual operating condition of the engine 2 is within the preset operating condition; When the actual working condition of the engine 2 is in the preset working condition, the gas delivery valve 34 is controlled to open, and the compensation valve 5 is controlled to switch to the second state; Obtaining the amount of air delivered from the storage tank 33 to the intake manifold 21; When the air provided to the intake manifold 21 via the storage tank 33 meets the demand of the engine 2, the air supply valve 34 is controlled to close, and when the actual operating condition of the engine 2 deviates from the preset operating condition, the compensation valve 5 is controlled to switch to the first state.

[0047] In this embodiment, timely and accurate jet compensation and lower power consumption cost of the air compressor 31 can be achieved through coordinated injection of high and low pressures, so as to achieve the purpose of optimizing the use of compressed air for the whole vehicle. In this way, the air storage unit 3, the compensation pipe 4 and the turbocharger 1 can work together to improve the problems of delayed start-up and insufficient low-speed air intake of the turbocharger 1, thereby improving the performance of the engine 2; and in the auxiliary injection process, the medium and high pressure air of the whole vehicle air storage system and the relatively low pressure air directly generated by the air compressor 31 are used in a coordinated manner to further improve the economy of the whole vehicle. It should be noted that the above-mentioned preset working conditions are when the vehicle is in a low-speed and high-load working condition or a medium-to-low load transient working condition.

[0048] 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.

[0049] In order to better understand the present invention, the following Figures 1 to 4 The technical solution of the present invention is described in detail: Based on all the above-mentioned embodiments of the auxiliary boost system, 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 intake air due to the hysteresis of the turbocharger 1. At this time, additional air is added to the intake pipe of the engine 2 through the high-pressure nozzle 331 and the low-pressure nozzle 41 to increase the intake air of the engine 2, optimize the combustion process of the engine 2, and ultimately improve the economy of the engine 2.

[0050] Specifically, when each control valve is in the default position, the normal inflation process of the vehicle storage tank 33 is as follows: It should be noted that, in one embodiment, the compensation three-way valve 51 connects the outlet of the air compressor 31 and the inlet of the dryer 35 in the default state; the regulating three-way valve 39 connects the outlet of the feedback pipe 36 of the air compressor 31 and the feedback pressure circuit of the dryer 35 in the default state; the feedback three-way valve 37 connects the feedback air path formed between the air compressor 31 and the dryer 35 in the default state; and the air supply valve 34 is closed in the default state.

[0051] When the vehicle is in normal driving conditions, when the pressure of the vehicle storage tank 33 is lower than the set pressure for inflation, the feedback pressure of the dryer 35 becomes the ambient atmospheric pressure, the air compressor 31 is activated to start pumping air, and the compressed air enters the storage tank 33 after passing through the dryer 35. When the pressure of the storage tank 33 is higher than the set pressure of the gas tank, the feedback pressure of the dryer 35 becomes the pressure inside the gas tank, the air compressor 31 is activated to enter the internal unloading or disengagement state, and inflation stops.

[0052] The process of combined injection when the air compressor 31 is in an unloaded or disconnected state is as follows: The air compressor 31 is in an internal unloading or disengaged state. When the working conditions of the whole vehicle and the engine 2 require compressed air injection compensation, the air supply valve 34 is opened by the controller 8, and the high-pressure air in the storage tank 33 is injected at high pressure through the high-pressure nozzle 331; the feedback three-way valve 37 is controlled to connect the feedback pressure of the air compressor 31 with the atmosphere, and the air compressor 31 is activated to start pumping; the compensation three-way valve 51 is controlled to connect the air outlet of the air compressor 31 with the low-pressure nozzle 41, so that the compressed gas generated by the air compressor 31 is injected at low pressure through the low-pressure nozzle 41, and the three-way valve is adjusted to the default position.

[0053] The high-pressure jet accurately and timely provides the air required by the engine 2 in the early stage of the jet and then exits, the air delivery valve 34 is closed, and the subsequent required air is continuously provided by the low-pressure jet until the jet demand ends. The feedback three-way valve 37 returns to the default state, connecting the feedback air path formed between the air compressor 31 and the dryer 35; the compensation three-way valve 51 returns to the default state, connecting the outlet of the air compressor 31 and the inlet of the dryer 35; the pressure in the storage tank 33 at the end of the jet automatically determines whether the air compressor 31 re-enters the internal unloading or disengagement state or starts to inflate the air tank.

[0054] The process of combined injection during the process of the air compressor 31 pumping air into the storage tank 33 is as follows: The air compressor 31 is in the state of inflating the storage tank 33 and the inflation process has not yet ended. When the working conditions of the whole vehicle and the engine 2 require compressed air injection compensation, the air supply valve 34 is opened by the controller 8, and the high-pressure air in the storage tank 33 is injected at high pressure through the high-pressure nozzle 331; the compensation three-way valve 51 is controlled to connect the air outlet of the air compressor 31 with the low-pressure nozzle 41, so that the compressed gas generated by the air compressor 31 is injected at low pressure through the low-pressure nozzle 41, and the feedback three-way valve 37 and the regulating three-way valve 39 remain unchanged.

[0055] The high-pressure sprayer exits after accurately and timely providing the air required by the engine 2 in the early stage of injection, and the air delivery valve 34 is closed; the required air is continued to be provided by the low-pressure sprayer until the injection demand ends. The compensation three-way valve 51 returns to the default state, connecting the outlet of the air compressor 31 and the inlet of the dryer 35; the air compressor 31 continues the previous process of pumping air from the storage tank 33.

[0056] The process of controlling the air compressor 31 to actively stop and pump air and adjusting the regeneration ratio of the dryer 35 is as follows: The controller 8 monitors the air flow of the air compressor 31 through the dryer 35. When the air flow is lower than the regeneration limit of the dryer 35, during the inflation process of the air compressor 31, when the storage tank 33 is nearly full but the pressure has not yet reached the maximum pressure set for the gas tank, the controller 8 switches the feedback three-way valve 37 and the regulating three-way valve 39 to connect and maintain the feedback pipe 36 of the air compressor 31 to the storage tank 33. The air compressor 31 enters an internal unloading or disengagement state under the high-pressure excitation of the feedback pipe 36. The regeneration of the dryer 35 is not activated until the air compressor 31 inflates the storage tank 33 again and the air flow through the dryer 35 reaches the regeneration limit.

[0057] In this way, the present invention provides additional air flow to the engine 2 through high-pressure and low-pressure air nozzles, which are sprayed into the intake manifold 21 of the engine 2, wherein the air of the high-pressure air nozzle is provided by the vehicle air tank, and the air of the low-pressure air nozzle is directly compressed by the air compressor 31; and by assisting in improving the air supply of the engine 2, the torque range in the low-speed area, the efficiency and responsiveness of the engine 2 can be effectively improved. In addition, a regulating three-way valve 39 connected to the ambient atmosphere and the storage tank 33 is added to the feedback air path of the air compressor 31, which can actively control the start or stop of the air compressor 31 according to the low-pressure air supply demand of the engine 2, the state of the vehicle air tank, and the regeneration demand of the dryer 35.

[0058] 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, the air outlet of which is connected to the intake manifold of the engine, and the air inlet of which is connected to the exhaust port of the engine; An air storage unit, comprising an air compressor, an air delivery pipe, a storage tank and an air delivery valve, wherein the air outlet of the air compressor, the air delivery pipe, the storage tank and the intake manifold are sequentially connected, and the air delivery valve is arranged in the connecting pipeline between the storage tank and the intake manifold; A compensating pipe connecting the air delivery pipe and the intake manifold; and The compensating valve is arranged between the compensating pipe and the gas pipe, and has a first state for controlling the on-off of the gas pipe and cutting off the compensating pipe, and a second state for cutting off the fluid in the gas pipe to flow to the compensating pipe.

2. The auxiliary boost system according to claim 1, characterized in that: The compensation valve is a compensation three-way valve, and the compensation three-way valve is arranged between the gas transmission pipe and the compensation pipe; or, The compensation valve includes two opening valves, one of which is arranged on the gas transmission pipe and located between the compensation pipe and the storage tank, and the other is arranged on the compensation pipe.

3. The auxiliary boost system according to claim 1, characterized in that: The auxiliary boosting system further includes a dryer having a gas drying circuit. The gas drying circuit is arranged in the gas transmission pipe and is located between the compensation valve and the storage tank.

4. The auxiliary boost system according to claim 3, characterized in that: The air compressor has a feedback pipe, and when the fluid pressure received by the feedback pipe reaches a preset value, the air compressor is controlled to enter an internal unloading or disengaging state; The dryer also has a regeneration gas circuit and a feedback pressure circuit. The inlet ends of the regeneration gas circuit and the feedback pressure circuit are respectively connected to one end of the gas pipeline close to the storage tank, and the outlet end of the feedback pressure circuit is connected to the feedback pipe.

5. The auxiliary boost system according to claim 4, characterized in that: The auxiliary boost system further comprises a feedback three-way valve, which is arranged on the feedback pipe and has a first channel for controlling the on-off of the feedback pipe and a second channel for controlling the on-off of the feedback pipe and the external environment.

6. The auxiliary boost system according to claim 5, characterized in that: The auxiliary boost system also includes a control pipe and a control three-way valve. One end of the control pipe is connected to the storage tank, and the other end is connected to the feedback pipe and is located between the feedback three-way valve and the dryer. The control three-way valve is arranged between the control pipe and the feedback pipe.

7. The auxiliary boost system according to claim 3, characterized in that: The gas storage unit further includes a multi-circuit protection valve, which is disposed on the gas transmission pipe and located between the dryer and the storage tank.

8. The auxiliary boost system according to claim 1, characterized in that: The gas storage unit further comprises a pressure sensor, which is disposed in the storage tank and is used to monitor the gas pressure in the storage tank.

9. An auxiliary boosting method, used in the auxiliary boosting system according to any one of claims 1 to 8, characterized in that: The auxiliary boosting method comprises the steps of: Acquiring the actual operating condition of the engine, and determining whether the actual operating condition of the engine is within a preset operating condition; When the actual working condition of the engine is in the preset working condition, the gas delivery valve is controlled to open, and the compensation valve is controlled to switch to the second state; obtaining the amount of air delivered from the storage tank to the intake manifold; When the air provided to the intake manifold via the storage tank meets the demand of the engine, the air delivery valve is controlled to close, and when the actual operating condition of the engine deviates from the preset operating condition, the compensation valve is controlled to switch to the first state.

10. A commercial vehicle, characterized in that: The invention comprises an auxiliary boost system as claimed in any one of claims 1 to 8.

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