Low-pressure injection increasing system and low-pressure injection increasing method for engine

Abstract

The low-pressure injection increasing system comprises an air inlet pipe, an exhaust pipe, an air storage module, a turbocharging module and an air compressor, and the low-pressure injection increasing system is connected with an air inlet of the engine through the air inlet pipe, supplies air to the engine and is connected with an exhaust port of the engine through the exhaust pipe. The turbocharging module is connected with the air inlet pipe and the exhaust pipe, in the running process of the vehicle, supercharged air inlet of the engine can be achieved through tail gas of the engine, horsepower of the engine is increased, and the vehicle is assisted in running, when the vehicle is in the starting or accelerating working condition, under the normal working condition, the air compressor pumps air into the air storage module, and compressed air is stored through the air storage module; when the vehicle is in a starting or accelerating working condition, the air compressor introduces compressed air into the air inlet pipe to increase the air inlet amount and the air inlet pressure of the engine, so that the air inlet pressure of the engine is remarkably improved, vehicle starting is accelerated, and the acceleration capacity of the vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to an engine low-pressure injection system and a low-pressure injection method. Background Art

[0002] In order to improve the torque and power of the engine, a turbocharged engine is currently usually used to forcibly increase the engine's intake volume.

[0003] However, turbocharging has a hysteresis phenomenon. Under low engine speed conditions, due to insufficient exhaust gas emissions, the turbocharger not only fails to bring about a power increase, but also affects engine performance due to exhaust gas obstruction, resulting in difficulty in starting the vehicle. In addition, due to the inertia of the impeller, the turbocharger reacts slowly to sudden changes in the throttle, resulting in a lack of power when the vehicle accelerates, affecting vehicle acceleration. Existing variable-section turbochargers such as those disclosed in the patent document with announcement number CN219281826U mainly improve the response time and acceleration capability of the turbocharger at low speeds by changing the cross-section of the turbine.

[0004] Although the improvement of the turbocharger can improve the vehicle's starting ability and acceleration ability to a certain extent, it can only alleviate the vehicle's starting ability and acceleration ability to a certain extent. It has no obvious effect on heavy commercial vehicles and it is difficult to fundamentally solve the problem of vehicle starting difficulty. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies, propose an engine low-pressure injection system and a low-pressure injection method, and solve the technical problem of vehicle starting difficulty in the prior art.

[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 engine low-pressure injection system, comprising: An air intake pipe, used for connecting to an air intake port of the engine; An exhaust pipe, used for connecting to the exhaust port of the engine; Gas storage module, for gas storage; a turbocharger module, connected to the intake pipe and the exhaust pipe, and used for supercharging the intake air of the intake pipe through the exhaust gas of the exhaust pipe; and An air compressor is connected to the air inlet pipe and the air storage module and is used to introduce compressed gas into the air inlet pipe or the air storage module.

[0007] In one embodiment, the engine low-pressure boost injection system also includes a connecting module and a controller, the connecting module includes a valve body, an air pump and a boost pipe, the valve body is connected to the air compressor, the air pump pipe connects the valve body and the air storage module, the boost pipe connects the valve body and the intake pipe, and the controller is connected to the valve body for controlling the air compressor to connect to the air pump pipe or the boost pipe.

[0008] In one embodiment, the air storage module includes a dryer, a protection valve and an air storage tank connected in sequence, the dryer is connected to the air compressor, and the engine low-pressure injection system also includes a load control module, one end of the load control module is connected to the feedback air inlet of the air compressor, and the other end of the load control module is connected to the dryer and / or the air storage tank to control the load of the air compressor through the feedback gas from the dryer and the air storage tank.

[0009] In one embodiment, the load control module includes a first feedback pipeline, one end of the first feedback pipeline is connected to the feedback gas inlet of the air compressor, and the other end of the first feedback pipeline is connected to the feedback gas outlet of the dryer. The air compressor is an electronically controlled air compressor, and the controller is also connected to the air compressor for controlling the load of the air compressor according to the feedback gas from the dryer.

[0010] In one embodiment, the load control module includes a second feedback pipeline and a valve assembly, one end of the second feedback pipeline is connected to the feedback gas inlet of the air compressor, and the other end of the second feedback pipeline is connected to the feedback gas outlet of the dryer. The valve assembly is installed on the second feedback pipeline, and the controller is also connected to the valve assembly for controlling the valve assembly to connect the feedback gas inlet of the air compressor to the atmosphere or the feedback gas outlet of the dryer.

[0011] In one embodiment, the valve assembly is also connected to the air storage tank, and is used to connect the feedback air inlet of the air compressor to the atmosphere, the feedback air outlet of the dryer or the air storage tank by controlling the valve assembly.

[0012] In one embodiment, the valve body includes a first three-position four-way valve, the valve assembly is also connected to the valve body, and the controller is also used to connect the compressed air outlet of the air compressor with the feedback air inlet of the air compressor by controlling the valve body.

[0013] In one embodiment, the valve assembly includes a second three-position four-way valve, one valve port of the second three-position four-way valve is connected to the gas storage tank or the valve body, and the other valve port of the second three-position four-way valve is connected to the atmosphere.

[0014] In one embodiment, the valve assembly includes two two-position three-way valves, wherein a valve port of one of the two-position three-way valves is connected to a valve body or an air storage tank, and a valve port of the other two-position three-way valve is connected to the atmosphere.

[0015] In a second aspect, the present invention further provides an engine low-pressure injection increase method, which is performed by the engine low-pressure injection increase system, comprising: When the vehicle is in a normal driving condition, the air compressor pumps air into the air storage module, and the engine pressurizes the intake air through the turbocharger module; When the vehicle is in a starting or accelerating state, the air compressor introduces compressed gas into the intake pipe, and the engine pressurizes the intake air through the turbocharger module and the air compressor.

[0016] Compared with the prior art, the engine low-pressure injection system provided by the present invention is provided with an intake pipe, an exhaust pipe, an air storage module, a turbocharger module and an air compressor. The low-pressure injection system is connected to the engine's air intake through the intake pipe to supply air to the engine, and is connected to the engine's exhaust port through the exhaust pipe. The turbocharger module connects the intake pipe and the exhaust pipe. During the operation of the vehicle, the engine's exhaust gas can be used to achieve pressurized intake of the engine, thereby increasing the engine's horsepower and assisting the vehicle in driving. When the vehicle is in a starting or accelerating condition, under normal conditions, the air compressor pumps air into the air storage module, and the compressed gas is stored through the air storage module. When the vehicle is in a starting or accelerating condition, the air compressor introduces compressed gas into the intake pipe to increase the engine's intake volume and intake pressure. At this time, the engine is simultaneously supercharged and inhaled through the turbocharger module and the air compressor, thereby significantly increasing the engine's intake pressure, accelerating the vehicle's starting and improving the vehicle's acceleration capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of an engine low-pressure injection system provided by a first embodiment of the present invention; Figure 2 is a schematic diagram of an engine low-pressure injection system provided by a second embodiment of the present invention; Figure 3 is a schematic diagram of an engine low-pressure injection system provided by a third embodiment of the present invention; Figure 4 is a schematic diagram of an engine low-pressure injection system provided by a fourth embodiment of the present invention; Figure 5 is a schematic diagram of an engine low-pressure injection system provided by the fifth and seventh embodiments of the present invention; Figure 6 is a schematic diagram of an engine low-pressure injection system provided by a sixth embodiment of the present invention; Figure 7 is a schematic diagram of an engine low-pressure injection system provided by an eighth embodiment of the present invention; Figure 8 It is a flow chart of the engine low-pressure injection method provided by an embodiment of the present invention.

[0018] Reference numerals in the figures: 10—intake pipe 20—exhaust pipe 30—gas storage module 31 - dryer 32 - protection valve 33 - gas storage tank 40 - turbocharger module 41 - turbocharger 42 - intercooler 50—air compressor 60—connection module 61—valve body 62 - air pump 63 - boost pipe 70 - controller 80—load control module 81—first feedback pipeline 82—second feedback pipeline 83—Valve assembly 10a—Engine. DETAILED DESCRIPTION

[0019] 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.

[0020] In order to solve the technical problems of vehicle starting difficulty and weak acceleration ability in the prior art, an embodiment of the present invention provides a low-pressure injection system and a low-pressure injection method for an engine 10a. The low-pressure injection system assists the air intake of the engine 10a by setting an air compressor 50, thereby accelerating the vehicle starting and improving the vehicle's acceleration ability.

[0021] It should be noted that the low-pressure boost injection system of the engine 10a 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 application of the low-pressure boost injection system of the engine 10a to a commercial vehicle is used as an example for explanation, and the principle of applying the low-pressure boost injection system of the engine 10a to other types of equipment is essentially the same as that applied to commercial vehicles, and will not be repeated here.

[0022] The low-pressure injection system of the engine 10a provided in the embodiment of the present invention is as follows: Figure 1-7 As shown, it includes an intake pipe 10, an exhaust pipe 20, an air storage module 30, a turbocharger module 40 and an air compressor 50. The intake pipe 10 is used to connect to the air intake of the engine 10a; the exhaust pipe 20 is used to connect to the exhaust port of the engine 10a; the air storage module 30 is used for air storage; the turbocharger module 40 is connected to the intake pipe 10 and the exhaust pipe 20, and is used to pressurize the intake of the intake pipe 10 through the exhaust gas of the exhaust pipe 20; the air compressor 50 is connected to the intake pipe 10 and the air storage module 30, and is used to introduce compressed gas into the intake pipe 10 or the air storage module 30.

[0023] Specifically, the low-pressure injection system of the engine 10a is provided with an intake pipe 10, an exhaust pipe 20, an air storage module 30, a turbocharger module 40 and an air compressor 50. The low-pressure injection system is connected to the intake port of the engine 10a through the intake pipe 10 to supply air to the engine 10a, and is connected to the exhaust port of the engine 10a through the exhaust pipe 20. The turbocharger module 40 connects the intake pipe 10 and the exhaust pipe 20. During the operation of the vehicle, the exhaust gas of the engine 10a can be used to realize the pressurized intake of the engine 10a, increase the horsepower of the engine 10a, and assist the vehicle in driving. When in the starting or accelerating condition, under normal conditions, the air compressor 50 pumps air into the air storage module 30, and the compressed gas is stored in the air storage module 30. When the vehicle is in the starting or accelerating condition, the engine 10a is in a low-speed and high-load condition or a medium-to-low load transient condition. The air compressor 50 introduces compressed gas into the intake pipe 10 to increase the intake volume and intake pressure of the engine 10a. At this time, the engine 10a is supercharged through the turbocharger module 40 and the air compressor 50, thereby significantly improving the intake pressure of the engine 10a, accelerating the vehicle start and improving the vehicle's acceleration capability.

[0024] In this embodiment, the compressed gas stored in the gas storage module 30 is mainly used for gas consumption of components such as vehicle braking, steering, engine 10a post-processing, and dryer 31 regeneration.

[0025] In this embodiment, the air compressor 50 mainly enters high-load operation when the vehicle starts, accelerates, and the air pressure of the air storage module 30 is insufficient, thereby increasing the corresponding speed of the engine 10a and accelerating the air storage of the air storage module 30. When the vehicle is in a normal operating state and the air storage capacity of the air storage module 30 is sufficient, the air compressor 50 is in a low-load operating state to reduce the load of the air compressor 50.

[0026] It can be understood that the gas storage module 30 can be any gas storage device or gas storage system that can store compressed gas.

[0027] In one embodiment, Figure 1-7 As shown, the gas storage module 30 includes a dryer 31, a protection valve 32 and a gas storage tank 33 connected in sequence, and the dryer 31 is connected to the air compressor 50. Specifically, the dryer 31 can dry the gas entering the gas storage tank 33, and when the dryer 31 reaches the regeneration condition, the gas storage tank 33 can also regenerate the dryer 31 by reversely supplying compressed gas to the dryer 31.

[0028] In one embodiment, Figure 1-7 As shown, the turbocharger module 40 includes a turbocharger 41 and an intercooler 42. The turbocharger 41 realizes intake air supercharging through the exhaust gas of the engine 10a, and reduces the intake air temperature of the intake pipe 10 through the intercooler 42.

[0029] It can be understood that the air compressor 50 can be connected to the air intake pipe 10 and the air storage module 30 by setting two pipeline structures with valves respectively connected to the air storage module 30 and the air intake pipe 10.

[0030] In one embodiment, Figure 1-7 As shown, the low-pressure injection system of the engine 10a further includes a connection module 60 and a controller 70. The connection module 60 includes a valve body 61, an air pumping pipe 62 and a pressure-boosting pipe 63. The valve body 61 is connected to the air compressor 50. The air pumping pipe 62 connects the valve body 61 and the air storage module 30. The pressure-boosting pipe 63 connects the valve body 61 and the air intake pipe 10. The controller 70 is connected to the valve body 61 and is used to control the air compressor 50 to communicate with the air pumping pipe 62 or the pressure-boosting pipe 63. Specifically, the air compressor 50 can be connected to the air storage module 30 and the air intake pipe 10 respectively through the air pumping pipe 62 and the pressure-boosting pipe 63. The communication state of the air pumping pipe 62 and the pressure-boosting pipe 63 with the compressed air outlet of the air compressor 50 can be controlled by the controller 70. When the air storage capacity of the air storage module 30 is insufficient, the controller 70 controls the air outlet of the air compressor 50 to connect to the air pumping pipe 62 to pump air into the air storage module 30; when the vehicle starts and accelerates, the engine 10a is in a low-speed and high-load condition or a medium-to-low load transient condition. Due to the responsiveness lag of the turbocharger module 40, the air intake of the engine 10a is insufficient. At this time, the controller 70 controls the air outlet of the air compressor 50 to connect to the intake pipe 10, replenishes compressed air into the intake pipe 10, and increases the air intake of the engine 10a.

[0031] In the first embodiment, if Figure 1 As shown, the valve body 61 is a three-way valve A, which has three connection ports a, b, and c. The connection port a is connected to the compressed air outlet of the air compressor 50, the air pumping pipe 62 is connected to the connection port b, and the boost pipe 63 is connected to the connection port c. The default state of the three-way valve A is ab connection, so that the compressor continues to pump air for the air storage module 30. When the air pressure of the vehicle air storage module 30 is greater than or equal to the set air pressure value, the controller 70 controls the three-way valve A to be in the ac position to replenish air to the engine 10a, thereby increasing the air intake of the engine 10a, optimizing the combustion process of the engine 10a, and ultimately improving the economy of the engine 10a.

[0032] In one embodiment, in order to ensure the intake pressure of the engine 10a and reduce the load of the air compressor 50, Figure 2-7As shown, the low-pressure injection system of the engine 10a further includes a load control module 80. One end of the load control module 80 is connected to the feedback gas inlet of the air compressor 50, and the other end of the load control module 80 is connected to the dryer 31 and / or the air storage tank 33, so as to control the load of the air compressor 50 through the feedback gas of the dryer 31 and the air storage tank 33. Specifically, the low-pressure injection system is provided with the load control module 80, so that the load of the air compressor 50 can be controlled according to the regeneration condition of the dryer 31 and / or the gas storage capacity of the air storage tank 33. When the dryer 31 is in the regeneration state and / or the gas storage capacity of the air storage tank 33 is large, the load control module 80 prompts the air compressor 50 to unload, thereby reducing the power consumption of the air compressor 50.

[0033] In this embodiment, the load of the air compressor 50 can be controlled by the gas storage capacity of the gas storage tank 33, or by the regeneration of the dryer 31, or by both the gas storage capacity of the gas storage tank 33 and the regeneration of the dryer 31.

[0034] In the second embodiment, if Figure 2 As shown, in order to realize the control of the load of the air compressor 50 by the dryer 31, the load control module 80 includes a first feedback pipeline 81, one end of the first feedback pipeline 81 is connected to the feedback gas inlet of the air compressor 50, and the other end of the first feedback pipeline 81 is connected to the feedback gas outlet of the dryer 31. The first feedback pipeline 81 connects the feedback gas outlet of the dryer 31 and the feedback gas inlet of the air compressor 50, so that the feedback gas of the dryer 31 can be directly passed to the feedback gas inlet of the air compressor 50.

[0035] In this embodiment, Figure 2 As shown, the air compressor 50 is an electronically controlled (clutch / internal unloading) air compressor 50 , and the controller 70 is also connected to the air compressor 50 for controlling the load of the air compressor 50 according to the feedback gas of the dryer 31 .

[0036] Specifically, the controller 70 controls the load of the air compressor 50 according to the feedback gas volume of the feedback gas inlet of the air compressor 50. When the feedback gas inlet of the air compressor 50 receives the high-pressure feedback gas of the dryer 31, the load of the air compressor 50 during the air pumping process is reduced. By setting the air compressor 50 as an electronically controlled air compressor and combining the first feedback pipeline 81, the load of the air compressor 50 can be controlled through the regeneration state of the dryer 31.

[0037] In the third embodiment, if Figure 3 As shown, the load control module 80 also includes a three-way valve B, which is installed in the first feedback pipeline 81. The default position of the three-way valve B connects the air storage tank 33 and the feedback gas inlet of the air compressor 50. Another optional position is to connect the atmospheric environment and the feedback gas inlet of the air compressor 50.

[0038] When the pneumatic boost function is not activated, the compressed gas of the air compressor 50 is delivered to the vehicle dryer 31 and the air tank 33. The three-way valve B is also in the default position. Once the pressure of the air tank 33 is lower than the air compressor 50 inflation condition, the air compressor 50 is controlled to switch to the inflation state to supply air at full load. Once the pressure of the air tank 33 rises to the regeneration condition of the dryer 31, the air compressor 50 is controlled to switch to the internal unloading state to reduce power consumption.

[0039] When the pneumatic boost function is activated, the two-position three-way valve B connects the feedback air inlet of the air compressor 50 to the atmosphere, causing the air compressor 50 to exit the internal unloading state and operate at full load. At the same time, the air compressor 50 sprays compressed air into the cylinder of the engine 10a.

[0040] In one embodiment, in order to realize the control of the load of the air compressor 50 by the dryer 31, as shown in FIG. Figure 4 and 6 As shown in Figure 7, the load control module 80 includes a second feedback pipeline 82 and a valve assembly 83. One end of the second feedback pipeline 82 is connected to the feedback gas inlet of the air compressor 50, and the other end of the second feedback pipeline 82 is connected to the feedback gas outlet of the dryer 31. The valve assembly 83 is installed on the second feedback pipeline 82. The controller 70 is also connected to the valve assembly 83, and is used to control the valve assembly 83 to connect the feedback gas inlet of the air compressor 50 to the atmosphere or the feedback gas outlet of the dryer 31. Specifically, the controller 70 controls the valve assembly 83 according to the regeneration status of the air compressor 50, thereby realizing the adjustment of the load of the air compressor 50.

[0041] In the fourth embodiment, if Figure 4 As shown, the valve assembly 83 includes a three-way valve C, which is installed in the second feedback pipeline 82. In the default state of the three-way valve C, the feedback gas outlet of the dryer 31 and the feedback gas inlet of the air compressor 50 are connected, and the valve port of the three-way valve C is connected to the atmosphere. In this embodiment, when the pneumatic boosting function is not activated, the two-position three-way valve C is also in the default position, and the compressed gas of the air compressor 50 is delivered to the vehicle dryer 31 and the air tank 33. Once the pressure of the air tank 33 rises to the regeneration condition of the dryer 31, the high-pressure feedback gas signal of the dryer 31 is delivered to the air compressor 50, so that the air compressor 50 switches to the internal unloading state to reduce power consumption; once the pressure of the air tank 33 is lower than the air compressor 50 pumping condition, the normal pressure feedback gas signal that is connected to the inside of the dryer 31 and the atmospheric environment is delivered to the air compressor 50, and the controller 70 opens the valve port of the three-way valve C connected to the atmosphere, and controls the air compressor 50 to switch to the pumping state to supply air at full load.

[0042] When the pneumatic boost function is activated, the three-way valve C connects the feedback air inlet of the air compressor 50 to the atmosphere, causing the air compressor 50 to exit the internal unloading state and operate at full load, spraying compressed air into the cylinder of the engine 10a.

[0043] In one embodiment, Figure 6-7 As shown, the valve assembly 83 is also connected to the air storage tank 33, and is used to connect the feedback air inlet of the air compressor 50 to the atmosphere, the feedback air outlet of the dryer 31 or the air storage tank 33 by controlling the valve assembly 83. Specifically, the valve assembly 83 is connected to the air storage tank 33, so that the load of the air compressor 50 can be controlled by the regeneration state of the dryer 31 and the air storage amount of the air storage tank 33.

[0044] In the fifth embodiment, if Figure 5 As shown, the valve body 61 includes a first three-position four-way valve, the valve assembly 83 is also connected to the valve body 61, and the controller 70 is also used to connect the compressed air outlet of the air compressor 50 with the feedback air inlet of the air compressor 50 by controlling the valve body 61. Specifically, in addition to being set as a three-way valve, the valve body 61 can also be set as a three-position four-way valve connected to the valve assembly 83. By connecting the valve assembly 83, the valve body 61 can keep the air compressor 50 in a low power consumption state of internal unloading when the air compressor 50 postpones the inflation and the dryer 31 postpones the regeneration.

[0045] The default position of the first three-position four-way valve is between the feedback gas outlet of the dryer 31 and the feedback gas inlet of the air compressor 50. The other two selectable positions are between the compressed gas outlet of the air compressor 50 and the feedback gas inlet of the air compressor 50, and between the atmospheric environment and the feedback gas inlet of the air compressor 50.

[0046] Through the setting of the first three-position four-way valve and the connection between the first three-position four-way valve and the valve assembly 83, when the pneumatic boost function is not activated, the compressed gas of the air compressor 50 is delivered to the vehicle dryer 31 and the air tank 33. At the same time, the first three-position four-way valve is in the default position. Once the pressure of the air tank 33 reaches the regeneration condition of the dryer 31, the high-pressure feedback gas signal is delivered to the air compressor 50 to control the air compressor 50 to switch to the internal unloading state to reduce power consumption; once the pressure of the air tank 33 is lower than the air compressor 50 inflation condition, the normal pressure feedback gas signal that is connected to the inside of the dryer 31 and the atmospheric environment is delivered to the air compressor 50 to control the air compressor 50 to switch to the inflation state for full load air supply.

[0047] When the pneumatic boost function is activated, the first three-position four-way valve connects the feedback air inlet of the air compressor 50 to the atmosphere, causing the air compressor 50 to exit the internal unloading state and operate at full load. At the same time, the air compressor 50 sprays compressed air into the cylinder of the engine 10a.

[0048] As the pressure in the air tank 33 drops, when the control system needs to control the air compressor 50 to postpone inflation, the compressed air outlet and the feedback air inlet of the air compressor 50 are connected, and the air compressor 50 is put into an internal unloading and low power consumption state through the high pressure of the feedback air circuit. Once the system needs to resume inflation of the air compressor 50, the first three-position four-way valve is switched to the default position.

[0049] As the pressure in the air tank 33 rises, when the control system needs to control the dryer 31 to postpone regeneration, the compressed air outlet and the feedback air inlet of the air compressor 50 are connected, and the air compressor 50 is put into an internal unloading and low power consumption state through the high pressure of the feedback air circuit. Once the control system needs to resume the regeneration of the dryer 31, the first three-position four-way valve is switched to the default position.

[0050] It can be understood that the valve assembly 83 can be connected to the valve body 61 by providing two three-way valves or one four-way valve.

[0051] In one embodiment, Figure 5-6 As shown, the valve assembly 83 includes a second three-position four-way valve, one of the valve ports of the second three-position four-way valve is connected to the air storage tank 33 or the valve body 61, and the other valve port of the second three-position four-way valve is connected to the atmosphere. Specifically, by setting the valve assembly 83 as a three-position four-way valve, the air storage tank 33 can be connected to the valve assembly 83, or the first three-position four-way valve can be connected to the valve assembly 83, so that the load of the air compressor 50 can be controlled by the air storage volume of the air storage tank 33, or the air compressor 50 can be controlled to be in an internal unloading low power consumption state according to the delayed inflation of the air compressor 50 and the delayed regeneration of the dryer 31, and the regeneration frequency of the air dryer 31 can be controlled by the joint operation of several solenoid valves, so as to reduce the regeneration gas consumption, avoid the waste of compressed air, and reduce the energy consumption of commercial vehicles.

[0052] In the sixth embodiment, if Figure 6 As shown, one of the valve ports of the second three-position four-way valve is connected to the gas storage tank 33. Specifically, the second three-position four-way valve can control the load of the air compressor 50 through the gas storage amount of the gas storage tank 33 by connecting to the gas storage tank 33.

[0053] In this embodiment, the default position of the second three-position four-way valve is between the feedback gas outlet of the dryer 31 and the feedback gas inlet of the air compressor 50, and the other two selectable positions are between the vehicle air tank 33 and the feedback gas inlet of the air compressor 50 and between the atmospheric environment and the feedback gas inlet of the air compressor 50.

[0054] When the pneumatic boost function is not activated, the valve body 61 is in the default position, and the compressed gas of the air compressor 50 is delivered to the vehicle dryer 31 and the air tank 33. At the same time, the second three-position four-way valve is in the default position. Once the pressure of the air tank 33 reaches the regeneration condition of the dryer 31, the high-pressure feedback gas signal is delivered to the air compressor 50 to control the air compressor 50 to switch to the internal unloading state to reduce power consumption; once the pressure of the air tank 33 is lower than the air compressor 50 inflation condition, the normal pressure feedback gas signal that is connected to the inside of the dryer 31 and the atmospheric environment is delivered to the air compressor 50 to control the air compressor 50 to switch to the inflation state for full load air supply.

[0055] As the pressure of the air tank 33 drops, when the control system needs to control the air compressor 50 to postpone the inflation, the second three-position four-way valve is switched to connect the air tank 33 and the feedback air inlet of the air compressor 50. Since the pressure of the air tank 33 is significantly higher than the normal pressure, the air compressor 50 is kept in an internal unloading and low power consumption state. Once the system needs to resume the inflation of the air compressor 50, the second three-position four-way valve is switched to the default position.

[0056] With the pressure of the air storage tank 33 rising, when the control system needs to control the dryer 31 to postpone regeneration, the second three-position four-way valve is switched to connect the air storage tank 33 and the air compressor 50 feedback air inlet. Since the pressure of the air storage tank 33 is significantly higher than the normal pressure, the air compressor 50 is switched to the internal unloading low power consumption state, and the system no longer meets the regeneration pressure requirement of the dryer 31, thereby postponing regeneration. Once the control system needs to resume the regeneration of the dryer 31, the second three-position four-way valve is switched to the default position.

[0057] When the pneumatic boost function is activated, the second three-position four-way valve connects the feedback air inlet of the air compressor 50 to the atmosphere, causing the air compressor 50 to exit the internal unloading state and operate at full load. At the same time, the valve body 61 switches and connects the outlet of the air compressor 50 and the intake pipe 10 of the engine 10a, spraying compressed air into the cylinder of the engine 10a.

[0058] In the seventh embodiment, if Figure 5 As shown, one of the valve ports of the second three-position four-way valve is connected to the valve body 61. Specifically, the second three-position four-way valve can control the air compressor 50 to be in an internal unloading low power consumption state according to the delayed airing of the air compressor 50 and the delayed regeneration of the dryer 31 through the valve body 61.

[0059] In this embodiment, the second three-position four-way valve is connected to the first three-position four-way valve.

[0060] In this embodiment, the default position of the second three-position four-way valve is between the feedback gas outlet of the dryer 31 and the feedback gas inlet of the air compressor 50. The other two selectable positions are between the compressed gas outlet of the air compressor 50 and the feedback gas inlet of the air compressor 50, and between the atmospheric environment and the feedback gas inlet of the air compressor 50.

[0061] When the pneumatic boost function is not activated, the valve body 61 is in the default position, and the compressed gas of the air compressor 50 is delivered to the vehicle dryer 31 and the air tank 33. At the same time, the second three-position four-way valve is in the default position. Once the pressure of the air tank 33 reaches the regeneration condition of the dryer 31, the high-pressure feedback gas signal is delivered to the air compressor 50 to control the air compressor 50 to switch to the internal unloading state to reduce power consumption; once the pressure of the air tank 33 is lower than the air compressor 50 inflation condition, the normal pressure feedback gas signal that is connected to the inside of the dryer 31 and the atmospheric environment is delivered to the air compressor 50 to control the air compressor 50 to switch to the inflation state for full load air supply.

[0062] When the pneumatic boost function is activated, the second three-position four-way valve connects the feedback air inlet of the air compressor 50 to the atmosphere, causing the air compressor 50 to exit the internal unloading state and operate at full load. At the same time, the valve body 61 switches and connects the outlet of the air compressor 50 and the intake manifold of the engine 10a, spraying compressed air into the cylinder of the engine 10a.

[0063] As the pressure of the air tank 33 drops, when the control system needs to control the air compressor 50 to delay inflation, the compressed air outlet and the feedback air inlet of the air compressor 50 are connected, and the air compressor 50 is kept in an internal unloading state through the high pressure of the feedback air circuit to reduce power consumption.

[0064] As the pressure in the air tank 33 rises, when the control system needs to control the dryer 31 to postpone regeneration, the compressed air outlet and feedback air inlet of the air compressor 50 are connected, and the air compressor 50 is switched to an internal unloading state through the high-pressure switching of the feedback air circuit to reduce power consumption, while cutting off the air supply to the dryer 31, thereby delaying regeneration.

[0065] In one embodiment, Figure 7 As shown, the valve assembly 83 includes two two-position three-way valves, wherein the valve port of one of the two-position three-way valves is connected to the valve body 61 or the gas storage tank 33, and the valve port of the other two-position three-way valve is connected to the atmosphere. Specifically, the two two-position three-way valves are three-way valve D and three-way valve E, respectively, and the three-way valve D and the three-way valve E are both installed in the second feedback gas pipeline, wherein the three-way valve D executes the feedback gas inlet of the air compressor 50 to be connected to the valve body 61 or the gas storage tank 33, and the three-way valve E executes the feedback gas inlet of the air compressor 50 to be connected to the gas storage tank 33.

[0066] In the eighth embodiment, if Figure 7 As shown, the valve port of the three-way valve D is connected to the gas storage tank 33, and the low-pressure injection has the following working modes: Work 1: When the engine 10 a does not need auxiliary air supply, the three-way valve D is connected to the three-way valve E, the three-way valve E is connected to the air dryer 31 , and the valve body 61 is connected to the air dryer 31 .

[0067] Work 2: When the engine 10a needs auxiliary air supply, the controller 70 controls the three-way valve E to connect to the atmosphere and the control valve body 61 to connect to the intake pipe 10 of the engine 10a, so that the air compressor 50 is in a compressed air working state and the compressed air is injected into the intake pipe 10 of the engine 10a.

[0068] Work 3: When the process of Work 2 is completed and the vehicle air storage tank 33 needs to be supplemented with compressed air, the controller 70 cuts off the power to the three-way valve E and the valve body 61 and returns to the state of Work 1.

[0069] Work 4: When the process of Work 2 is completed and the vehicle air tank 33 does not need to be supplemented with compressed air, the controller 70 cuts off the power to the three-way valve E and the valve body 61, controls the three-way valve D to connect the multi-circuit protection valve 32, and puts the air compressor 50 in a non-compressed air working state. When the pressure of the vehicle air tank 33 detected by the pressure sensor is lower than the limit and needs to be supplemented with compressed air, the controller 70 cuts off the power to the three-way valve D and returns to the state of Work 1.

[0070] In a second aspect, the present invention further provides a low-pressure injection method for an engine 10a, which is performed by the low-pressure injection system of the engine 10a, such as Figure 8 As shown, including: When the vehicle is in a normal driving condition, the air compressor 50 pumps air into the air storage module 30, and the engine 10a pressurizes the intake air through the turbocharger module 40; When the vehicle is in a starting or accelerating state, the air compressor 50 introduces compressed gas into the intake pipe 10 , and the engine 10 a pressurizes the intake air through the turbocharger module 40 and the air compressor 50 .

[0071] Specifically, during the operation of the vehicle, the exhaust gas of the engine 10a can be used to supercharge the intake of the engine 10a, thereby increasing the horsepower of the engine 10a and assisting the vehicle in driving. When the vehicle is in a starting or accelerating condition, under normal conditions, the air compressor 50 pumps air into the air storage module 30, and the compressed gas is stored through the air storage module 30. When the vehicle is in a starting or accelerating condition, the engine 10a is in a low-speed and high-load condition or a medium-to-low load transient condition. The air compressor 50 introduces compressed gas into the intake pipe 10 to increase the intake volume and intake pressure of the engine 10a. At this time, the engine 10a is supercharged and inhaled synchronously through the turbocharger module 40 and the air compressor 50, thereby significantly increasing the intake pressure of the engine 10a, accelerating the starting of the vehicle and improving the acceleration capability of the vehicle.

[0072] 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 engine low-pressure injection system, characterized in that: include: An air intake pipe, used for connecting to an air intake port of the engine; An exhaust pipe, used for connecting to the exhaust port of the engine; Gas storage module, for gas storage; a turbocharger module, connected to the intake pipe and the exhaust pipe, and used for supercharging the intake air of the intake pipe through the exhaust gas of the exhaust pipe; and An air compressor is connected to the air inlet pipe and the air storage module and is used to introduce compressed gas into the air inlet pipe or the air storage module.

2. The engine low-pressure injection system according to claim 1, characterized in that: The engine low-pressure boost injection system also includes a connecting module and a controller. The connecting module includes a valve body, an air pump and a boost pipe. The valve body is connected to the air compressor, the air pump pipe connects the valve body and the air storage module, the boost pipe connects the valve body and the intake pipe, and the controller is connected to the valve body for controlling the air compressor to connect to the air pump pipe or the boost pipe.

3. The engine low-pressure injection system according to claim 2, characterized in that: The air storage module includes a dryer, a protection valve and an air storage tank connected in sequence, the dryer is connected to the air compressor, and the engine low-pressure injection system also includes a load control module, one end of the load control module is connected to the feedback air inlet of the air compressor, and the other end of the load control module is connected to the dryer and / or the air storage tank to control the load of the air compressor through the feedback gas from the dryer and the air storage tank.

4. The engine low-pressure injection system according to claim 3, characterized in that: The load control module includes a first feedback pipeline, one end of which is connected to the feedback gas inlet of the air compressor, and the other end of which is connected to the feedback gas outlet of the dryer. The air compressor is an electronically controlled air compressor, and the controller is also connected to the air compressor for controlling the load of the air compressor according to the feedback gas from the dryer.

5. The engine low-pressure injection system according to claim 4, characterized in that: The load control module includes a second feedback pipeline and a valve assembly, one end of the second feedback pipeline is connected to the feedback gas inlet of the air compressor, and the other end of the second feedback pipeline is connected to the feedback gas outlet of the dryer. The valve assembly is installed on the second feedback pipeline, and the controller is also connected to the valve assembly for controlling the valve assembly to connect the feedback gas inlet of the air compressor to the atmosphere or the feedback gas outlet of the dryer.

6. The engine low-pressure injection system according to claim 5, characterized in that: The valve assembly is also connected to the air storage tank and is used to connect the feedback air inlet of the air compressor to the atmosphere, the feedback air outlet of the dryer or the air storage tank by controlling the valve assembly.

7. The engine low-pressure injection system according to claim 5, characterized in that: The valve body includes a first three-position four-way valve, the valve assembly is also connected to the valve body, and the controller is also used to connect the compressed air outlet of the air compressor with the feedback air inlet of the air compressor by controlling the valve body.

8. The engine low-pressure injection system according to claim 5, characterized in that: The valve assembly comprises a second three-position four-way valve, one valve port of the second three-position four-way valve is connected to the gas storage tank or the valve body, and the other valve port of the second three-position four-way valve is connected to the atmosphere.

9. The engine low-pressure injection system according to claim 5, characterized in that: The valve assembly comprises two two-position three-way valves, wherein a valve port of one of the two-position three-way valves is connected to a valve body or an air storage tank, and a valve port of the other two-position three-way valve is connected to the atmosphere.

10. A method for increasing low-pressure injection of an engine, characterized in that: The method is implemented by the engine low-pressure injection system according to any one of claims 1 to 9, comprising: When the vehicle is in a normal driving condition, the air compressor pumps air into the air storage module, and the engine pressurizes the intake air through the turbocharger module; When the vehicle is in a starting or accelerating state, the air compressor introduces compressed gas into the intake pipe, and the engine pressurizes the intake air through the turbocharger module and the air compressor.

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