Integrated device, exhaust gas aftertreatment system, and control method

Abstract

Integrated device for pumps and nozzles, wherein the pump (11) is provided for pumping a fluid medium to the nozzle (12) and the nozzle (12) is provided for injecting the fluid medium into the exhaust gas of the engine, characterized in that the integrated device comprises a pump arrangement (18) and a nozzle arrangement (19), wherein the pump arrangement (18) is provided with a receiving compartment (322) for at least partially receiving the nozzle arrangement (19);the pump assembly (18) comprises a pump assembly housing (180) and the pump (11) mates with the pump assembly housing (180), the pump assembly housing (180) comprises an inlet channel (15) positioned upstream of the pump (11) and communicating with the pump (11), and an outlet channel (16) positioned downstream of the pump (11) and communicating with the pump (11), the outlet channel (16) communicating with the nozzle assembly (19), the pump assembly housing (180) comprises a shroud (2) and a first housing positioned below the shroud (2), the shroud (2) is provided with a shroud cavity (21), and the first housing is provided with a pressure sensor receiving opening (313) communicating with the receiving compartment (322);the pump assembly (18) comprises a motor coil (111) for driving the pump (11), a magnetic body (72) for cooperating with the motor coil (111), and a first gear assembly (74) and a second gear assembly (75) that mesh with each other, the first gear assembly (74) comprises a first gear shaft (741) and a first gear (742), the second gear assembly (75) comprises a second gear shaft (751) and a second gear (752), and the first gear meshes with the second gear; the nozzle assembly (19) comprises a nozzle assembly housing (190), the nozzle (12) mates with the nozzle assembly housing (190), and the nozzle assembly further comprises a nozzle coil (121) for driving the nozzle; the integrated device is further provided with a pressure sensor (172) received in the pressure sensor receiving opening (313), the pressure sensor (172) does not have its own housing and the casing (2) serves as a housing for the pressure sensor (172);

Description

Technical field

[0001] The present invention relates to an integrated device, an exhaust aftertreatment system, and a control method, which fall within the technical field of engine exhaust aftertreatment. Printed prior art in the present technical field is disclosed in document DE 10 2008 060 373 A1. State of the art

[0002] Due to increasingly stringent emissions standards for vehicles with internal combustion engines, selective catalytic reduction (SCR) is traditionally used as an aftertreatment technology in industry to reduce the emission of pollutants such as nitrogen oxides. Urea solutions are injected into the exhaust gas upstream of the SCR. A urea solution is hydrolyzed and pyrolyzed to produce ammonia, and then reacts with nitrogen oxides to reduce pollutant concentrations.

[0003] Currently, a commercially available urea injection system is usually an air-assisted system or a non-air-assisted system. Of course, both systems include a urea tank assembly, a pump supply unit connected to the urea tank assembly by a low-pressure pipe, a nozzle module connected to the pump supply unit by a high-pressure pipe, and a controller. The pump supply unit includes a urea pump, a pressure sensor, etc., and the nozzle module includes a urea nozzle, etc. The urea pump and the urea nozzle are spaced a long distance apart and connected by a urea pipe. Furthermore, a conventional urea injection system includes a large number of components and is therefore difficult to install and costly.

[0004] Therefore, a new technical solution must be provided urgently. Summary of the present invention

[0005] An object of the present invention is to provide an integrated device capable of realizing the downsizing of the device, an exhaust aftertreatment system having the integrated device, and a control method.

[0006] To solve the above problem, the present invention applies the following technical solution: an integrated device comprising a pump and a nozzle, the pump being provided for pumping a fluid medium to the nozzle, the nozzle being provided for injecting the fluid medium into the exhaust gas of the engine, the integrated device comprising a pump arrangement and comprising a nozzle assembly, wherein the pump assembly is provided with a receiving compartment for at least partially receiving the nozzle assembly; the pump assembly comprises a pump assembly housing and the pump mates with the pump assembly housing, the pump assembly housing comprises an inlet channel positioned upstream of the pump and communicating with the pump, and an outlet channel positioned downstream of the pump and communicating with the pump, the outlet channel communicating with the nozzle assembly, the pump assembly housing comprises a shroud and a first housing positioned below the shroud, the shroud is provided with a shroud cavity, and the first housing is provided with a pressure sensor receiving opening communicating with the receiving compartment;the pump assembly comprises a motor coil for driving the pump, a magnetic body for cooperating with the motor coil, and a first gear assembly and a second gear assembly that mesh with each other; the first gear assembly comprises a first gear shaft and a first gear; the second gear assembly comprises a second gear shaft and a second gear; and the first gear meshes with the second gear; the nozzle assembly comprises a nozzle assembly housing, and the nozzle mates with the nozzle assembly housing; the nozzle assembly further comprises a nozzle coil for driving the nozzle; the integrated device is further provided with a pressure sensor which is received in the pressure sensor receiving opening, the pressure sensor does not have its own housing and the casing serves as a housing for the pressure sensor.

[0007] As an improved technical solution of the present invention, the pump is a urea pump, the nozzle is a urea nozzle, and the fluid medium is a urea solution.

[0008] As an improved technical solution of the present invention, the pump is a fuel pump, the nozzle is a fuel nozzle, and the fluid medium is a fuel.

[0009] As an improved technical solution of the present invention, the integrated device includes a controller connected to the motor coil and the nozzle coil, and the controller independently controls the urea pump and the urea nozzle separately.

[0010] As an improved technical solution of the present invention, the pressure sensor is connected to the outlet channel and the integrated device further comprises an overflow element connected between the outlet channel and the inlet channel.

[0011] As an improved technical solution of the present invention, the pressure sensor comprises a base plate, a circuit board fixed to the base plate, a lead wire connected to the circuit board, and a protective cover fixed to the circuit board, wherein the base plate is provided with a plate body portion and a convex portion extending downward from the plate body portion, a seal ring is arranged on the convex portion, and the convex portion is provided with a through hole penetrating downward and extending upward through the plate body portion.

[0012] As an improved technical solution of the present invention, the circuit board is provided with a chip at the position corresponding to the through hole, and the protective cover is attached to the periphery of the chip to protect the chip.

[0013] As an improved technical solution of the present invention, the protective cover is provided with an opening communicating with the chip, and the opening communicates with the encapsulation cavity.

[0014] As an improved technical solution of the present invention, the pump assembly housing is provided with a connecting plate assembly that fits with the first housing, the connecting plate assembly includes a plate portion and a metal cover that is fixed to the plate portion and projects upward, the magnetic body is accommodated in the metal cover, and the motor coil is slipped onto the periphery of the metal cover.

[0015] As an improved technical solution of the present invention, the pump assembly further comprises an elastic body accommodated in the metal cover and positioned below the magnetic body, and the elastic body can be compressed to absorb the volume expansion caused by urea freezing.

[0016] As an improved technical solution of the present invention, the plate portion is pressed downward against the pressure sensor.

[0017] As an improved technical solution of the present invention, the pump assembly housing is provided with a gear groove for receiving the first gear and the second gear, the first gear meshing with the second gear, one side of the gear groove being provided with a liquid inlet cavity communicating with the inlet channel, and the other side of the gear groove being provided with a liquid outlet cavity communicating with the outlet channel.

[0018] As an improved technical solution of the present invention, the nozzle assembly comprises a magnetic portion for cooperating with the nozzle coil, a valve needle portion positioned below the magnetic portion, a spring acting between the magnetic portion and the valve needle portion, and a valve seat mating with the valve needle portion.

[0019] As an improved technical solution of the present invention, the nozzle coil is positioned on the periphery of the magnetic portion, the valve needle portion is provided with a valve needle, and the valve seat is provided with an injection port that mates with the valve needle.

[0020] As an improved technical solution of the present invention, the valve seat comprises a swirl disk welded to the nozzle assembly housing, the injection port is arranged on the swirl disk, and the swirl disk is further provided with a plurality of swirl grooves communicating with the injection port.

[0021] As an improved technical solution of the present invention, the integrated device is provided with a cooling arrangement for cooling the urea nozzle, and the cooling arrangement cools the urea nozzle by a cooling medium.

[0022] As an improved technical solution of the present invention, the controller is provided with a control board, the motor coil and the nozzle coil are electrically connected to the control board, the casing is provided with a through hole communicating with the casing cavity and a waterproof and breathable cover fixed in the through hole; the control board is welded to a wire connector, and the wire connector is exposed outside the casing.

[0023] As an improved technical solution of the present invention, the first housing comprises a first upper surface, a first lower surface, and a first side surface, wherein the first upper surface is provided with a first annular groove, a first island portion surrounded by the first annular groove, and a first seal ring received in the first annular groove. The first seal ring is positioned below the metal cover, the plate portion is pressed downward against the first seal ring. The first island portion is provided with a first positioning hole penetrating the first upper surface and the first lower surface, and a second positioning hole penetrating the first lower surface. The urea pump comprises a first shaft sleeve received in the first positioning hole and a second shaft sleeve received in the second positioning hole.wherein the first gear shaft is inserted into the first shaft sleeve and the second gear shaft is inserted into the second shaft sleeve.,

[0024] As an improved technical solution of the present invention, the first lower surface is provided with a first relief groove communicating with the first positioning hole and the second positioning hole.

[0025] As an improved technical solution of the present invention, the first island portion further comprises a first distribution groove penetrating the first upper surface and communicating with the second positioning hole, and a first communication hole penetrating the first upper surface and communicating with the inlet channel; the first housing is provided with a second communication hole penetrating the first lower surface and communicating with the liquid inlet cavity, and an outlet hole penetrating the first lower surface and communicating with the liquid outlet cavity.

[0026] As an improved technical solution of the present invention, the first housing is provided with a spill member receiving groove communicating with the outlet port, and the integrated device is provided with a spill member installed in the spill member receiving groove; when the pressure in the outlet passage is greater than a predetermined value, the spill member is opened to return part of the urea solution to the inlet passage.

[0027] As an improved technical solution of the present invention, the pump assembly housing comprises a second housing positioned below the first housing and connected to the first housing, the second housing comprises a second upper surface and a second lower surface, and the gear groove penetrates the second upper surface and the second lower surface.

[0028] As an improved technical solution of the present invention, the pump assembly housing comprises a third housing positioned below the second housing and connected to the second housing, the third housing comprising a body portion and a convex portion extending downward from the body portion, the body portion being provided with a third upper surface, the third upper surface being provided with a third annular groove and a third island portion surrounded by the third annular groove, the third island portion being provided with a third positioning hole and a fourth positioning hole penetrating the third upper surface, and the third positioning hole and the fourth positioning hole extending into the convex portion;the urea pump comprises a third shaft sleeve received in the third positioning hole and a fourth shaft sleeve received in the fourth positioning hole, wherein the first gear shaft is inserted into the third shaft sleeve and the second gear shaft is inserted into the fourth shaft sleeve;

[0029] As an improved technical solution of the present invention, the third island portion is provided with a second distribution groove and a third distribution groove penetrating the third upper surface, the second distribution groove communicating with the third positioning hole, and the third distribution groove communicating with the fourth positioning hole.

[0030] As an improved technical solution of the present invention, the nozzle assembly housing comprises a main body portion and an extension portion extending downward from the main body portion, the main body portion is provided with a receiving compartment for receiving the urea nozzle and a groove for receiving the convex portion, and the receiving compartment extends downward into the extension portion.

[0031] As an improved technical solution of the present invention, the nozzle assembly comprises a magnetic portion cooperating with the nozzle coil, a valve needle portion connected to the magnetic portion, and a spring acting on the valve needle portion; the extension portion is provided with a current collecting cavity communicating with the receiving compartment, wherein the part of the magnetic portion protruding from the second upper surface is received in the receiving compartment.

[0032] As an improved technical solution of the present invention, the spring is installed in the magnetic portion and the valve needle portion, the valve needle portion is provided with a conical portion and a valve needle extending downward from the conical portion, the valve needle extends into the current collecting cavity, the magnetic portion is provided with a first communication port communicating with the receiving compartment, the valve needle portion is provided with a second communication port communicating with the first communication port, and the conical portion is provided with a third communication port allowing the second communication port to communicate with the current collecting cavity.

[0033] As an improved technical solution of the present invention, the nozzle assembly includes a valve seat that mates with the valve needle, the valve seat includes a swirl disc welded to the extension portion, the swirl disc is provided with an injection port that mates with the valve needle and a plurality of swirl grooves that communicate with the injection port, and the swirl grooves communicate with the flow collection cavity.

[0034] As an improved technical solution of the present invention, the nozzle assembly housing is provided with a first cooling passage, a second cooling passage spaced from the first cooling passage, and an end cover sealed at the periphery of the extension portion, the nozzle assembly housing forms a cooling annular groove communicating with the first cooling passage and the second cooling passage between the end cover and the extension portion, the first cooling passage is connected to an inlet port for injecting an engine coolant, and the second cooling passage is connected to an outlet port for discharging an engine coolant.

[0035] The present invention further discloses the following technical solution: an exhaust aftertreatment system comprising an exhaust aftertreatment injection system and an exhaust aftertreatment housing system, wherein the injection system comprises the integrated device and the housing system comprises a carrier positioned downstream of the integrated device.

[0036] The present invention further discloses the following technical solution: a control method for an integrated device, wherein the integrated device is the aforementioned integrated device, the control method comprising: driving the pump to suck the fluid medium into the pump through the inlet channel; after pressurization by the pump, directing the fluid medium through the outlet channel to the nozzle; and when an injection condition is reached, energizing the nozzle coil and at least partially opening the nozzle to inject the fluid medium into the exhaust gas of the engine, wherein the motor coil and the nozzle coil are controlled separately.

[0037] Compared with the prior art, an integrated device comprising a pump and a nozzle according to the present invention enables excellent integration of the pump and the nozzle, has a simple and compact structure, and facilitates installation by the customer. Based on the integration of a urea pump and a urea nozzle in the integrated device, due to the improvement in control precision, the ratio of urea to nitrogen oxides injected into the exhaust gas can be appropriately adjusted, thereby reducing the risk of crystallization caused by excessive urea injection. In addition, the pressure sensor does not have its own housing and uses a casing. The size of the sensor can be reduced without affecting the function of the sensor, and the downsizing of the integrated device can be realized. Short description of the drawings Fig. Figure 1 shows a schematic diagram of an exhaust aftertreatment system of the present invention used to treat engine exhaust. Fig. 2 shows a schematic diagram of the integrated device in Fig. 1. Fig. 3 shows a stereoscopic view of an integrated device according to an embodiment of the present invention. Fig. 4 shows a stereoscopic view of Fig. 3 from a different angle. Fig. 5 shows a stereoscopic view of Fig. 3 from yet another angle. Fig. 6 shows a front view of Fig. 3. Fig. 7 shows a view of Fig. 3 from the right. Fig. 8 shows a view of Fig. 5 from the bottom. Fig. 9 shows a top view of Fig. 5. Fig. Figure 10 shows a stereoscopic exploded partial view of an integrated device of the present invention in which the pump assembly is separated from the nozzle assembly. Fig. 11 shows a stereoscopic exploded partial view of the pump assembly in Fig. 10, in which the sheath, the motor coil and the waterproof and breathable cover are separated. Fig. Figure 12 shows a stereoscopic view in which the sheath and the motor coil are Fig. 11 are installed together. Fig. 13 shows a stereoscopic exploded view of Fig. 12. Fig. Figure 14 shows another stereoscopic exploded view of Fig. 11, in which the control board is separated. Fig. Figure 15 shows a stereoscopic exploded view after removing the casing and the control board in Fig. 14, in which the connecting plate assembly is separated. Fig. 16 shows a stereoscopic view of the connecting plate arrangement in Fig. 15. Fig. Figure 17 shows a stereoscopic exploded view of the connecting plate assembly in Fig. 15. Fig. 18 shows another stereoscopic exploded view of Fig. 15, in which the magnetic body, the elastic body and the screws are separated. Fig. 19 shows another exploded view of Fig. 18, in which the first sealing ring, the temperature sensor and the pressure sensor are separated. Fig. Figure 20 shows a stereoscopic exploded view of the magnetic body, the elastic body and the screws in Fig. 19. Fig. 21 shows a sectional view of Fig. 20 from a certain angle after assembly. Fig. 22 shows a stereoscopic view of the pressure sensor in Fig. 19. Fig. 23 shows a stereoscopic view of Fig. 22 from a different angle. Fig. Figure 24 shows a stereoscopic exploded view of Fig. 22. Fig. 25 shows a sectional view along the CC line in Fig. 22. Fig. 26 shows a stereoscopic exploded partial view after removal of the first sealing ring, the temperature sensor and the pressure sensor in Fig. 19, in which the first housing is separated. Fig. Figure 27 shows a stereoscopic exploded view of the first housing in Fig. 26. Fig. 28 shows a stereoscopic exploded view of Fig. 27 from a different angle. Fig. 29 shows a stereoscopic view of a part of the first housing in Fig. 27. Fig. 30 shows a stereoscopic view of Fig. 29 from a different angle. Fig. 31 shows a plan view of Fig. 30. Fig. 32 shows a sectional view along the DD line in Fig. 31. Fig. 33 shows a sectional view along the EE line in Fig. 31. Fig. 34 shows a sectional view along the FF line in Fig. 31. Fig. 35 shows a plan view of Fig. 29. Fig. 36 shows a sectional view along the GG line in Fig. 35. Fig. 37 shows a sectional view along the HH line in Fig. 35. Fig. 38 shows a sectional view along the II line in Fig. 35. Fig. 39 shows a stereoscopic view after removing the first housing in Fig. 26. Fig. 40 shows a stereoscopic exploded partial view of Fig. 39, in which the first gear arrangement and the second gear arrangement are separated. Fig. 41 shows a plan view of Fig. 39. Fig. 42 shows a stereoscopic exploded view after removal of the first gear assembly and the second gear assembly in Fig. 40. Fig. 43 shows a stereoscopic view of the second housing in Fig. 42. Fig. 44 shows a stereoscopic view of Fig. 43 from a different angle. Fig. 45 shows a stereoscopic view of the third housing arrangement of Fig. 42. Fig. 46 shows a plan view of Fig. 45. Fig. 47 shows a sectional view along the JJ line in Fig. 46. Fig. 48 shows a sectional view along the KK line in Fig. 46. Fig. Figure 49 shows a stereoscopic exploded partial view of a nozzle assembly of the present invention. Fig. 50 shows an exploded partial view of the urea nozzle in Fig. 49. Fig. 51 shows a stereoscopic view of the nozzle assembly housing in Fig. 49. Fig. 52 shows an exploded partial view of Fig. 51. Fig. 53 shows a plan view of a portion of the nozzle assembly housing in Fig. 52. Fig. 54 shows a sectional view along the LL line in Fig. 53. Fig. 55 shows a sectional view along the MM line in Fig. 54. Fig. 56 shows a sectional view along the NN line in Fig. 54. Fig. 57 shows a stereoscopic view of Fig. 53 from a different angle. Fig. Figure 58 shows a stereoscopic exploded view of an integrated device of the present invention. Fig. 59 shows a sectional view along the AA line in Fig. 9. Fig. 60 shows a sectional view along the OO line in Fig. 59. Fig. 61 shows a sectional view along the PP line in Fig. 59. Fig. 62 shows a sectional view along the QQ line in Fig. 60. Fig. 63 shows a sectional view along the RR line in Fig. 61. Fig. 64 shows a sectional view along the BB line in Fig. 9. Fig. 65 shows a sectional view along the SS line in Fig. 64. Special designs

[0038] According to the presentation in Fig. 1, the present invention discloses an exhaust aftertreatment system 100 that can be used to treat the exhaust gas of the engine 10, thereby reducing pollutant emissions to meet the requirements of emission standards. The exhaust aftertreatment system 100 comprises an exhaust aftertreatment injection system 200 and an exhaust aftertreatment housing system 300, wherein the injection system 200 comprises an integrated device 1 for pumping a urea solution from the urea tank 201 (see arrow X) and injecting the urea solution into the exhaust gas of the engine 10 (e.g., into the exhaust pipe 106 or the housing system 300); the housing system 300 comprises a mixing device 301 positioned downstream of the integrated device 1 and a support 302 positioned downstream of the mixing device 301.Of course, in some embodiments, it is also possible to provide no mixing device or to provide two or more mixing devices. The carrier 302 may, for example, be an SCR carrier.

[0039] The engine 10 is provided with an engine coolant circulation circuit. As shown in Fig. 1, in one embodiment of the present invention, the engine coolant circulation circuit comprises a first circulation circuit 101 (shown by the wide arrow Y) and a second circulation circuit 102 (shown by the thin arrow Z), wherein the first circulation circuit 101 is configured to cool the integrated device 1, thereby reducing the risk of it burning out due to the high-temperature engine exhaust gas; the second circulation circuit 102 is configured to heat the fuel tank 201, thereby realizing the pyrolysis function.It is understood that in the first circulation circuit 101, the integrated device 1 is provided with an inlet port 103 for the inflow of an engine coolant and an outlet port 104 for the outflow of an engine coolant; in the second circulation circuit 102, a control valve 105 is provided for opening or closing the control valve 105 under suitable conditions to control the second circulation circuit 102. The urea tank 201 is provided with a heating element 202, which is connected to the second circulation circuit 102 to pyrolyze the urea solution using the temperature of the engine coolant.

[0040] The integrated device 1 of the present invention will be described in more detail below.

[0041] According to the presentation in Fig. 2, the integrated device 1 of the present invention basically integrates the functions of the urea pump 11 and the urea nozzle 12. The urea pump 11 may be, among others, a gear pump, a diaphragm pump, a piston pump, or a vane pump. It should be understood that the term "integrated" used herein means that the urea pump 11 and the urea nozzle 12 may be installed as a single device on an outlet pipe; alternatively, the urea pump 11 and the urea nozzle 12 are located close to each other and connected by a short connecting pipe, which can be regarded as a single device as a whole.

[0042] In addition, the exhaust aftertreatment system 100 of the present invention is further provided with a controller 13 for independently controlling the urea pump 11 and the urea nozzle 12. It is understood that the controller 13 may be integrated with the integrated device 1 or provided separately from the integrated device 1. As shown in Fig. 2, the controller 13 is integrated into the integrated device 1 in the illustrated embodiment of the present invention in order to achieve a high degree of parts integration and to improve the ease of installation for the customer.

[0043] The integrated device 1 is provided with a housing 14 for accommodating the urea pump 11 and the urea nozzle 12. The Fig. The embodiment shown in Figure 2 is merely a rough representation of the housing 14. For example, in one embodiment, the urea pump 11 and the urea nozzle 12 share the housing 14. In another embodiment, the housing 14 is divided into a first housing that mates with the urea pump 11 and a second housing that mates with the urea nozzle 12, and the first housing and the second housing are assembled together to form a whole body. The housing 14 is provided with an inlet passage 15 that connects the urea tank 201 to the urea pump 11 and an outlet passage 16 that connects the urea pump 11 to the urea nozzle 12. It should be noted that the terms "inlet" in "inlet passage 15" and "outlet" in "outlet passage 16" used herein refer to the urea pump 11.In other words, upstream of the urea pump 11 is the inlet, and downstream of the urea pump 11 is the outlet. The outlet channel 16 communicates with the urea nozzle 12 to pump a urea solution to the urea nozzle 12. It should be understood that the inlet channel 15 is positioned upstream of the urea pump 11 and is a low-pressure channel; and the outlet channel 16 is positioned downstream of the urea pump 11 and is a high-pressure channel.

[0044] Furthermore, the integrated device 1 is provided with a temperature sensor 171 for detecting a temperature. The temperature sensor 171 can be configured to communicate with the inlet channel 15 and / or the outlet channel 16; alternatively, the temperature sensor 171 can be configured for installation anywhere in the integrated device 1. A signal detected by the temperature sensor 171 is sent to the controller 13; the controller 13 can improve the injection accuracy of the urea nozzle 12 through a control algorithm developed based on the input signal and other signals. The integrated device 1 is further provided with a pressure sensor 172 for detecting pressure, and the pressure sensor 172 is connected to the outlet channel 16 to detect the pressure in the high-pressure channel at the outlet of the urea pump 11.Due to the integrated design of the present invention, the inner channel is relatively short, and it can be considered that the pressure sensor 172 is located close to the urea nozzle 12. An advantage of this design is that the pressure measured by the pressure sensor 172 is close to the pressure in the urea nozzle 12, thereby improving the data accuracy and the injection accuracy of the urea nozzle 12.

[0045] According to the presentation in Fig. 2, the integrated device 1 is further provided with an overflow element 173 connected between the outlet channel 16 and the inlet channel 15. The overflow element 173 may be, among other things, an overflow valve, a safety valve, or an electrically controlled valve. The function of the overflow element 173 is that when the pressure in the high-pressure channel exceeds a predetermined value, the overflow element 173 is opened to discharge the urea solution in the high-pressure channel into the low-pressure channel or to return it directly to the urea tank 201, thereby implementing pressure regulation.

[0046] To drive the urea pump 11, the urea pump 11 is provided with a motor coil 111, which is connected to the controller 13. To drive the urea nozzle 12, the urea nozzle 12 is provided with a nozzle coil 121, which is connected to the controller 13.

[0047] The controller 13 communicates with the temperature sensor 171 and the pressure sensor 172 to send temperature signals and pressure signals to the controller 13. Of course, to achieve precise control, the controller 13 can also receive other signals, such as signals from a CAN bus related to engine operating parameters. In addition, the controller 13 can further receive the rotational speed of the urea pump 11; of course, the reception of a rotational speed signal can be achieved by a corresponding rotational speed sensor 175 (hardware) or by a control algorithm (software). The controller 13 independently controls the urea pump 11 and the urea nozzle 12, respectively. An advantage of this control is that it can reduce the influence of the operation of the urea pump 11 on the urea nozzle 12 to achieve greater control accuracy.

[0048] Furthermore, the urea nozzle 12 must be cooled in some cases because the engine exhaust gas has a high temperature and the exhaust nozzle 12 is installed on the outlet pipe. The integrated device 1 is further provided with a cooling arrangement for this purpose, and the cooling arrangement cools the urea nozzle 12 with a cooling medium. The cooling medium can be, among others, air and / or an engine coolant and / or a lubricating oil and / or urea, etc. As shown in Fig. 2, water cooling is used in the illustrated embodiment of the present invention, which means the use of an engine coolant to cool the urea nozzle 12. A cooling channel 141 is provided in the housing 14, through which an engine coolant can flow.

[0049] According to the presentation in Fig. 2, the integrated device 1 works as follows: The controller 13 drives the urea pump 11 to operate; the urea solution contained in the urea tank 201 is drawn into the urea pump 11 through the inlet channel 15; after pressurization, the urea solution is transported through the outlet channel 16 to the urea nozzle 12, where the controller 13 acquires and / or calculates necessary signals, such as temperature, pressure, and pump speed. When an injection condition is reached, the controller 13 sends a control signal to the urea nozzle 12, such as energizing the nozzle coil 121, and implements urea injection by controlling the movement of the valve needle. The controller 13 sends a control signal to the urea pump 11 to control its speed, thereby stabilizing the system pressure. In the illustrated embodiment of the present invention, the controller 13 controls the urea pump 11 and the urea nozzle 12 independently.

[0050] According to the presentation in Fig. 3-65, the integrated device 1 in the illustrated embodiment of the present invention comprises a pump 18, a nozzle arrangement 19 and a controller 13. As shown in Fig. 10, the nozzle arrangement 19 is at least partially inserted into the pump arrangement 18 and installed therewith by a number of fastening bolts 64.

[0051] According to the presentation in Fig. 3-10, the pump assembly 18 in the illustrated embodiment of the present invention includes a pump assembly housing 180 and a urea pump 11 that mates with the pump assembly housing 180. The pump assembly housing 180 includes a shell 2 positioned at the top, and a first housing 3, a second housing 4, and a third housing 5 positioned below the shell 2 and stacked on top of each other. In the illustrated embodiment of the present invention, the first housing 3, the second housing 4, and the third housing 5 are made of metallic materials.

[0052] According to the presentation in Fig. 11 and Fig. 12, the casing 2 includes a casing cavity 21 for covering the controller 13 and at least part of the pump assembly 18, a through-hole 22 connected to the casing cavity 21, a plurality of first fastening holes 23 positioned in the periphery, and a waterproof and breathable cover 24 fixed in the through-hole 22. The controller 13 is equipped with a chip and other electronic components that heat up during use and cause expansion of the ambient air. The present invention solves the problem of damage to the chip and / or electronic components due to air expansion by providing a waterproof and breathable cover 24 that also has a sealing effect. Furthermore, the waterproof and breathable cover 24 can improve the operating environment of the controller 13, allowing it to meet the working conditions.In the illustrated embodiment of the present invention, the casing 2 is made of a metallic material with good heat dissipation performance to improve heat dissipation performance. Furthermore, the casing 2 may be further provided with a plurality of external heat sinks (not shown) to improve the heat dissipation performance.

[0053] According to the presentation in Fig. 11 and Fig. 14, the controller 13 includes a control board 131 and a lead connector 132 welded to the control board 131. The lead connector 132 extends through the casing 2, making it exposed for connection to an external circuit. In the illustrated embodiment of the present invention, the control board 131 is annular and provided with a central opening 135 positioned in the center. The pump assembly 18 is also provided with a plurality of support columns 631 attached to the first housing 3 for supporting the control board 131.

[0054] According to the presentation in Fig. 11 and Fig. 14-19, the pump assembly housing 180 is also provided with a connecting plate assembly 6 positioned between the casing 2 and the first housing 3. In particular, the connecting plate assembly 6 is provided with a plate portion 61 and a metal cover 62 fixed to the plate portion 61 and projecting upward. The metal cover 62 extends upward through the central opening 135 of the control board 131. As shown in Fig. 11, the control board 131 is held together by the support columns 631 and the casing 2, and a gap is formed between the control board and the connecting plate assembly 6 to ensure better heat dissipation of the control board 131 and better interference prevention.

[0055] According to the presentation in Fig. 16, the plate portion 61 is provided with a through-opening 614, a first threaded opening 618, and a hole 615 extending through its upper and lower surfaces. As shown in Fig. 14, the pressure sensor 172 passes at least partially through the through-opening 614, and the temperature sensor 171 passes at least partially through the hole 615. The lead wire 1721 of the pressure sensor 172 passes through the through-opening 614, the lead wire 124 of the nozzle assembly 19 passes through the first threaded opening 618, and the lead wire 1711 of the temperature sensor 171 passes through the hole 615 and is electrically connected to the control board 131. Furthermore, the plate portion 61 is, as shown in Fig. 15 is provided with several fastening holes 611 through which the screw 133 passes. As shown in Fig. 17, the plate portion 61 is provided with an opening 617 corresponding to the metal cover 62. In the illustrated embodiment of the present invention, the lower end of the metal cover 62 is welded to the inner wall of the opening 617.

[0056] In the illustrated embodiment of the present invention, the urea pump 11 is a gear pump comprising a motor coil 111, the metal cover 62, an elastic body 71 and a magnetic body 72 positioned in the metal cover 62, a first seal ring 73 positioned below the metal cover 62, and a first gear assembly 74 and a second gear assembly 75 meshing with each other.

[0057] Since a gear pump can provide a relatively high working pressure, it is useful for increasing the flow rate of the urea nozzle 12. Furthermore, the gear pump can also be switched, which is useful for pumping out residual urea solution and reducing the risks of urea crystallization. As shown in Fig. 12 and Fig. 13, the motor coil 111 is provided with a holder 112 and a coil 113 wound around the holder 112. The holder 112 is provided with an opening 114 for receiving the metal cover 62. In the illustrated embodiment of the present invention, the motor coil 111 is press-fitted into the casing cavity 21, so that the motor coil 111 can be integrated into the casing cavity 21 without the use of any additional fixing elements (such as screws), thereby reducing the number of parts. Furthermore, the urea pump 11 as shown in Fig. 20 and Fig. 21 further comprises an outer sleeve 723 for receiving the magnetic body 72, and the outer sleeve 723 is housed directly in the metal cover 62.

[0058] According to the presentation in Fig. 59, the motor coil 111 is slid onto the periphery of the metal cover 62. The plate portion 61 presses down the first sealing ring 73 to realize the seal. In the illustrated embodiment of the present invention, the elastic body 71 is positioned at the lower end of the magnetic body 72, and the elastic body 71 and the magnetic body 72 are supported together by a metal frame 720; for example, the magnetic body 72 and the elastic body 71 are slid onto the upper and lower ends of the metal frame 720, respectively. The metal frame 720 is provided with a partition plate 721 positioned between the elastic body 71 and the magnetic body 72. Except for the partition plate 721, the metal frame 720 is generally a hollow cylinder, and the first gear assembly 74 is at least partially housed in the metal frame 720 (as shown in Fig. 59). To better restrict the elastic body 71, one end of the metal frame 720 is provided with a hook 724, which is pressed against the elastic body 71. The hook 724 is provided with a guide pin 725, which facilitates the sliding of the elastic body 71 onto the metal frame 720. The elastic body 71 is provided with a radially extending mounting hole 711, the metal frame 720 is provided with a fixing hole 726 corresponding to the mounting hole 711, and the upper end of the first gear assembly 74 is radially fixed to the metal frame 720 by a screw 722 installed in the mounting hole 711 and the fixing hole 726. This arrangement can prevent the axial movement of the first gear assembly 74 and improve the running stability of the gear pump. It is well known that the volume of a urea solution expands upon freezing.In the present invention, an elastic body 71 is provided. The elastic body 71 can be compressed to absorb the volume expansion, thereby preventing damage to another component due to the volume expansion.

[0059] According to the presentation in Fig. 22-25, the pressure sensor 172 in the illustrated embodiment of the present invention includes a base plate 176, a circuit board 177 fixed to the base plate 176, a lead wire 1721 connected to the circuit board 177, and a protective cover 178 attached to the circuit board 177. The base plate 176 is provided with a plate body 1761 and a convex portion 1762 extending downward from the plate body 1761, and a sealing ring 1722 is disposed on the convex portion 1762. The convex portion 1762 is provided with a through hole 1763 penetrating downward, and the through hole 1763 penetrates the plate portion 1761 and the circuit board 177 upward. The circuit board 177 is provided with a chip 1771 at the location corresponding to the through-hole 1763. The protective cover 178 is attached to the periphery of the chip 1771 to protect the chip 1771.In the illustrated embodiment of the present invention, the cover 178 is cuboid-shaped, and the cover 178 is provided with an opening 1781 that communicates with the chip 1771. As shown in . Fig. 25 and Fig. 59, the pressure sensor 172 in the present invention does not have its own housing, unlike a pressure sensor according to the prior art; instead, the casing 2 is used as its housing. This arrangement can reduce the volume, facilitate installation, and reduce costs. In the illustrated embodiment of the present invention, the pressure sensor 172 is a differential pressure sensor that converts differential pressure changes at the upper and lower ends of the chip 1771 into electrical signals. Since those skilled in the art are well aware of the working principle of differential pressure sensors, it will not be described in detail again here.

[0060] According to the presentation in Fig. 26-48, the first housing 3, the second housing 4, and the third housing 5 in the illustrated embodiment of the present invention are machined workpieces and are fixed to one another from top to bottom by bolts 66. The first housing 3 comprises a first upper surface 31, a first lower surface 32, and a first side surface 33, wherein the first upper surface 31 is provided with a first annular groove 311 and a first island portion 312 surrounded by the first annular groove 311. The first annular groove 311 is used to receive the first sealing ring 73. The first lower surface 32 is provided with a second annular groove 325 and a second island portion 326 surrounded by the second annular groove 325. The second annular groove 325 is used to receive the second sealing ring 731 (as shown in Fig. 64).

[0061] The first island portion 312 is provided with a first positioning hole 3121 penetrating the first upper surface 31 and the first lower surface 32, a second positioning hole 3122 penetrating the first lower surface 32, a first communication hole 3123 penetrating the first upper surface 31 and communicating with the intake passage 15, and a first distribution groove 3124 penetrating the first upper surface 31 and communicating with the second positioning hole 3122. As shown in Fig. 27, Fig. 28 and Fig. 59, the urea pump 11 is provided with a first shaft sleeve 76 received in the first positioning hole 3121 and a second shaft sleeve 77 received in the second positioning hole 3122. Furthermore, the first housing 3 further includes an internally threaded hole 317 corresponding to the screw 133. During assembly, the screw 133 is tightened after passing through the fastening hole 611 of the plate portion 61 to fix the connecting plate assembly 6 in the internally threaded hole 317.

[0062] The first housing 3 further includes a plurality of first mounting holes 318 for passing the bolts 66. The first mounting holes 318 pass through the first upper surface 31 and the first lower surface 32. The first upper surface 31 is also provided with a pressure sensor receiving hole 313, positioned on one side of the first island portion 312, for receiving the pressure sensor 172 and a temperature sensor receiving hole 314 for receiving the temperature sensor 171. As shown in Fig. 59, a seal exists between the sealing ring 1722 on the pressure sensor 172 and the inner wall of the pressure sensor receiving opening 313. The plate portion 61 presses on the pressure sensor 172 to achieve fixation. In addition, the first housing 3 is also provided with an outwardly convex mounting flange 315, and the mounting flange 315 is provided with a second mounting opening 316 corresponding to the first mounting opening 23. During assembly, the bolts 63 are successively passed through the second mounting opening 316 and the support columns 631 and screwed tightly into the internal thread of the first mounting opening 23. With this arrangement, the first housing 3 and the casing 2 can be fixed, and the control board 131 can be clamped (see Fig. 59).

[0063] In addition, the first housing 3 is as shown in Fig. 30 is provided with a liquid inlet channel 332 passing through the first side surface 33 for connection to a urea port 331. The first housing 3 is provided with a second communication port 3127 penetrating the first lower surface 32 and communicating with the liquid inlet channel 332. The first communication port 3123 and the second communication port 3127 are perpendicular to the liquid inlet channel 332. The first positioning port 3121, the second positioning port 3122, and the second communication port 3127 penetrate downward through the second island portion 326. The second island portion 326 is also provided with an outlet port 3126 penetrating the first lower surface 32. The first lower surface 32 is provided with a first relief groove 321 which communicates with the first positioning opening 3121 and the second positioning opening 3122 to ensure pressure equalization.The first relief groove 321 is positioned on the second island portion 326. Furthermore, the first housing 3 is also provided with a receiving compartment 322 penetrating downward through the first lower surface 32 for receiving at least a portion of the nozzle assembly 19. As shown in FIG. Fig. 33, Fig. 34 and Fig. 36, the receiving compartment 322 communicates with the pressure sensor receiving opening 313. The receiving compartment 322 also communicates with the outlet opening 3126. As shown in Fig. 32 and Fig. 33, in the illustrated embodiment of the present invention, the outlet opening 3126 is slanted and has approximately the shape of an inverted "V" in the first housing 3. The first housing 3 is provided with a second threaded opening 323 corresponding to the first threaded opening 618.

[0064] In addition, the first housing 3 is as shown in Fig. 38, Fig. 64 and Fig. 65 is also provided with an overflow element receiving groove 319, which communicates with the inlet channel 332 and the receiving compartment 322. The overflow element receiving groove 319 penetrates outward through the first side surface 33 to receive the overflow element 173. In the illustrated embodiment of the present invention, the overflow element 173 is a relief valve and its function is to ensure, by pressure relief, that the pressure in the high-pressure channel of the integrated device 1 lies within a safe range. To fix the overflow element 173, the first housing 3 is provided with a plug 5122, which fixes the overflow element 173. As shown in Fig. 65, the overflow element 173 is provided with a seepage opening 1731, which is always connected to the inlet channel 15 and the outlet channel 16. This arrangement allows, on the one hand, to reduce the pressure fluctuation of the system, particularly when the nozzle arrangement 19 injects urea; on the other hand, the urea solution can be allowed to flow, which is beneficial for heat dissipation of the motor coil 111.

[0065] According to the presentation in Fig. 1, the urea connection 331 is connected to the urea tank 201 through the urea connecting pipe 333. To better realize the pyrolysis function, the exhaust gas aftertreatment system 100 can also be provided with a heating device 334 for heating the urea connecting pipe 333. As shown in Fig. 22 and Fig. 29, the liquid inlet channel 332 extends horizontally into the first housing 3 in the illustrated embodiment of the present invention. Of course, the liquid inlet channel 332 may also be arranged at a certain angle in other embodiments.

[0066] According to the presentation in Fig. 39-41, the first gear assembly 74 includes a first gear shaft 741 and a first gear 742 fixed to the first gear shaft 741; the second gear assembly 75 includes a second gear shaft 751 and a second gear 752 fixed to the second gear shaft 751, and meshes the first gear 742 with the second gear 752. As shown in Fig. 34, in the illustrated embodiment of the present invention, the first gear 742 externally meshes with the second gear 752. Furthermore, the first gear shaft 741 is a drive shaft, the second gear shaft 751 is a drive shaft, and the first gear shaft 741 is located higher than the second gear shaft 751. The upper end of the first gear shaft 741 passes through the first shaft sleeve 76 and is at least partially fixed in the metal frame 720. The upper end of the second gear shaft 751 is positioned in the second shaft sleeve 77. When the motor coil 111 is energized, it interacts with the magnetic body 72, and the electromagnetic force drives the first gear shaft 741 to rotate, thereby driving the first gear 742 and the second gear 752 to rotate.

[0067] The second housing 4 is positioned below the first housing 3 and connected to the first housing 3. Furthermore, for better positioning, a plurality of positioning pins 328 are arranged between the first housing 3 and the second housing 4. The second housing 4 includes a second upper surface 41, a second lower surface 42, and a gear groove 43 extending through the second upper surface 41 and the second lower surface 42 for receiving the first gear 742 and the second gear 752. One side of the gear groove 43 is provided with a liquid inlet cavity 431 that communicates with the inlet channel 15, and the other side of the gear groove 43 is provided with a liquid outlet cavity 432 that communicates with the outlet channel 16.Specifically, the liquid inlet cavity 431 communicates with the second communication port 3127, and the upper end of the liquid outlet cavity 432 communicates with the outlet port 3126. Furthermore, the second upper surface 41 of the second housing 4 is provided with a first receiving opening 411 through which the nozzle assembly 19 passes, and the second lower surface 42 is provided with a second receiving opening 421 for positioning the nozzle assembly 19. The second receiving opening 421 is larger than the first receiving opening 411 to form stepped openings. The nozzle assembly 19 protrudes upward from the second upper surface 41 and is received in the receiving compartment 322. With this arrangement, a high-pressure urea solution can be supplied to the urea nozzle 12. Furthermore, the second upper surface 41 is further provided with a third threaded opening 412 corresponding to the second threaded opening 323.The first threaded opening 618, the second threaded opening 323, and the third threaded opening 412 are aligned with each other for passing the lead wire 124 of the nozzle assembly 19. The second housing 4 further includes a plurality of second mounting openings 418 aligned with the first mounting openings 318.

[0068] According to the presentation in Fig. 26 and 45-48, the third housing 5 is positioned below the second housing 4 and connected to the second housing 4. The third housing 5 includes a body portion 51, a convex portion 52 extending downward from the body portion 51, and a flange 53 extending outward from the body portion 51. The flange 53 is provided with a plurality of third mounting openings 531 aligned with the second mounting openings 418 for passing the bolts 66 therethrough. The body portion 51 is provided with a third upper surface 511; the third upper surface 511 is provided with a third annular groove 512 and a third island portion 513 surrounded by the third annular groove 512. The third annular groove 512 is used to receive a third sealing ring 732 (as in Fig. 64). The third island portion 513 is provided with a third positioning hole 5111 penetrating the third upper surface 511 and a fourth positioning hole 5112 penetrating the third upper surface 511. The third housing 5 is provided with a third shaft sleeve 78 housed in the third positioning hole 5111 and a fourth shaft sleeve 79 housed in the fourth positioning hole 5112. The lower end of the first gear shaft 741 is positioned in the third shaft sleeve 78, and the lower end of the second gear shaft 751 is positioned in the fourth shaft sleeve 79.

[0069] Furthermore, the third island portion 513 is provided with a second distribution groove 5114 and a third distribution groove 5115 arranged on the third upper surface 511, the second distribution groove 5114 communicating with the third positioning hole 5111 and the third distribution groove 5115 communicating with the fourth positioning hole 5112. As shown in Fig. 43, the second distribution groove 5114 and the third distribution groove 5115 in the third housing 5 are inclined. As shown in Fig. 48, the lower end of the liquid outlet cavity 432 communicates with the second distribution groove 5114 and the third distribution groove 5115.

[0070] During operation, a urea solution enters the liquid inlet channel 332 through the urea connecting pipe 333; part of the urea solution enters the metal cover 62 through the first connecting hole 3123, and the other part of the urea solution enters the liquid inlet cavity 431 through the second connecting hole 3127. The urea solution located in the metal cover 62 seeps directly into the first positioning hole 3121 to lubricate the first shaft sleeve 76 and the second positioning hole 3122 along the first distribution groove 3124 to lubricate the second shaft sleeve 77. The urea solution entering the liquid inlet cavity 431 is divided into two partial flows. One partial flow enters the outlet channel 16 after being pressurized by the gear pump.The other partial flow enters the third positioning opening 5111 and the fourth positioning opening 5112 through the second distribution groove 5114 and the third distribution groove 5115, respectively, to lubricate the third shaft sleeve 78 and the fourth shaft sleeve 79, improving the rotational stability of the gear pump and reducing its wear. The high-pressure urea solution entering the outlet channel 16 enters the receiving compartment 322 along the outlet opening 3126 to flow toward the nozzle assembly 19, whereas a portion of the urea solution flows toward the overflow element 173.When the pressure of the overflow element 173 is below a predetermined value, the overflow element 173 is closed and communicates only through the seepage opening 1731; when the pressure is above the predetermined value of the overflow element 173, the overflow element 173 opens and a portion of the urea solution enters the liquid inlet channel 332 to achieve pressure relief.

[0071] It should be understood that in the illustrated embodiment of the present invention, the inlet passage 15 includes the liquid inlet passage 332, the second communication port 3127, and the liquid inlet cavity 431. Since the inlet passage 15 is positioned upstream of the urea pump 11, it is referred to as a low-pressure passage. The outlet passage 16 includes the liquid outlet cavity 432, the outlet port 3126, the receiving compartment 322, etc. Since the outlet passage 16 is positioned downstream of the urea pump 11, it is referred to as a high-pressure passage.

[0072] According to the presentation in Fig. 49-58, the nozzle assembly 19 includes a nozzle assembly housing 190 and a urea nozzle 12 that mates with the nozzle assembly housing 190.

[0073] The nozzle assembly housing 190 includes a main body portion 91, an extension portion 92 extending downward from the main body portion 91, and a mounting flange 93 extending outward from the main body portion 91. The mounting flange 93 is provided with a plurality of mounting holes 931 for attaching the integrated device 1 to the outlet pipe 106 or the housing system 300. The main body portion 91 is provided with a fourth upper surface 911 and a fourth side surface 912. The fourth upper surface 911 is provided with a receiving compartment 94 for receiving the urea nozzle 12 and a groove 95 for receiving the convex portion 52. As shown in Fig. 55, the receiving compartment 94 extends downward into the extension portion 92. The main body portion 91 is also provided with a cylindrical portion 917 projecting upward into the receiving compartment 94 for supporting the urea nozzle 12.

[0074] The nozzle assembly housing 190 is also provided with the cooling assembly for cooling the urea nozzle 12. In the illustrated embodiment of the present invention, the cooling assembly is a water cooling assembly. The cooling channel 141 positioned in the nozzle assembly housing 190 includes a first cooling channel 913 extending through the fourth side surface 912 and a second cooling channel 914 spaced from the first cooling channel 913, the first cooling channel 913 being connected to the inlet port 103 and the second cooling port 914 being connected to the outlet port 104. The nozzle assembly housing 190 is provided with an end cover 96 sealed at the periphery of the extension portion 92. In the illustrated embodiment of the present invention, the end cover 96 is welded to the extension portion 92.With this arrangement, the nozzle assembly housing 190 forms a cooling ring groove 916 connecting the first cooling channel 914 and the second cooling channel 915 between the end cover 96 and the extension portion 92.

[0075] In the illustrated embodiment of the present invention, the mounting flange 93 is machined integrally with the main body portion 91. Of course, in other embodiments, the mounting flange 93 may be machined separately from the main body portion 91 and then welded.

[0076] According to the presentation in Fig. 50, the urea nozzle 12 in the illustrated embodiment of the present invention comprises a nozzle coil 121, a magnetic portion 81 cooperating with the nozzle coil 121, a valve needle portion 82 disposed below the magnetic portion 81, a spring 83 acting between the magnetic portion 81 and the valve needle portion 82, and a valve seat 84 mating with the valve needle portion 82 (see Fig. 5). The nozzle coil 121 is wound around the periphery of the magnetic portion 81. The urea nozzle 12 further includes a sleeve portion 122 that is slid onto the periphery of the nozzle coil 121. The spring 83 is installed in the magnetic portion 81 and the valve needle portion 82. The valve needle portion 82 is provided with a tapered portion 821 and a valve needle 822 extending downward from the tapered portion 821. As shown in Fig. 52, the valve seat 84 includes a swirl disk 85 welded to the extension portion 92. The swirl disk 85 is provided with an injection port 851 that mates with the valve needle 822 and a plurality of swirl grooves 852 that communicate with the injection port 851. As shown in Fig. 10, Fig. 50 and Fig. 59, a fourth sealing ring 812 for sealing the inner wall of the receiving compartment 322 is pushed onto the upper end of the magnetic section 81; a fifth sealing ring 813 for sealing the inner wall of the receiving compartment 94 is pushed onto the lower end of the magnetic section 81. As shown in Fig. 59, the cylindrical portion 917 supports the valve needle portion 82, so that the valve needle portion 82 and the nozzle coil 121 can substantially overlap in the moving direction of the valve needle 822 and increase the effect of the electromagnetic force generated by the nozzle coil 121 on the valve needle portion 82, thereby reducing the drive current, reducing the power consumption of the urea nozzle 12, and reducing heat generation. Furthermore, a gasket 86 mating with the urea nozzle 12 is provided in the accommodation compartment 94 for adjusting the gap between the magnetic portion 81 and the valve needle portion 82. Of course, the stroke of the valve needle portion 82 is closely related to the above-mentioned gap. By adjusting the gap with gaskets 86 of different thicknesses, the stroke of the valve needle portion 82 can be precisely controlled to improve the accuracy of the urea nozzle 12.

[0077] According to the presentation in Fig.59, the extension portion 92 is provided with a current collection cavity 921, and the valve needle 822 extends into the current collection cavity 921. The magnetic portion 81 is provided with a first communication port 811 communicating with the accommodation compartment 322, the valve needle portion 82 is provided with a second communication port 823 communicating with the first communication port 811, and the conical portion 821 is provided with a third communication port 824 allowing the second combination port 823 to communicate with the current collection cavity 921. The swirl groove 852 communicates with the current collection cavity 921. The lower part of the sleeve portion 122 is received in the accommodation compartment 94, and the part of the sleeve portion 122 protruding from the fourth upper surface 911 is received in the accommodation compartment 322. The cooling ring groove 916 is positioned at the periphery of the current collection cavity 921.

[0078] It will be appreciated that other embodiments of the present invention employ, for example, an integrated device for injecting fuel into the exhaust gas of an engine to achieve regeneration of a downstream diesel particulate filter (DPF). In this application, the urea pump 11 may be replaced by a fuel pump, the urea nozzle 12 may be replaced by a fuel nozzle, and the urea solution may be replaced by a fuel. This variation will be readily apparent to one skilled in the art and thus will not be described in detail again here.

[0079] For a better understanding of the present invention, the urea pump and the fuel pump are collectively referred to as the pump, the urea nozzle and the fuel nozzle are collectively referred to as the nozzle, and the urea solution and the fuel are collectively referred to as the fluid medium.

[0080] Compared with the prior art, the integrated device 1 of the present invention is an integrated structure in which a urea pipe used in the prior art to connect a pump and a nozzle can be omitted or shortened, or the plug-ins between various sensors and the wiring harness in a pump power unit of the prior art can be omitted, or a pyrolyzer is not required, and is thus highly reliable. The integrated device 1 of the present invention has a compact structure and a small volume, making it suitable for installation in various types of vehicles. Furthermore, in the integrated device 1 of the present invention, the internal fluid medium channel is short, the pressure drop is small, and the dead volume between the pump and the nozzle is small; thus, the efficiency is high.The temperature sensor 171 and the pressure sensor 172 are located near the nozzle, and the injection pressure accuracy is high. Furthermore, by controlling the pump and the nozzle separately, nozzle movement caused by pumping is avoided, thus improving the control accuracy. Due to the improved injection accuracy of the nozzle, the amount of urea injected into and from the exhaust gas can be ensured to be proportional to the amount of nitrogen oxides; thus, the risk of crystallization caused by excessive injection of urea is reduced. The integrated device 1 of the present invention can employ water cooling, so that the urea residue in the integrated device 1 cannot reach the crystallization point and crystallization does not occur.

Claims

Integrated device for pumps and nozzles, wherein the pump (11) is provided for pumping a fluid medium to the nozzle (12) and the nozzle (12) is provided for injecting the fluid medium into the exhaust gas of the engine, characterized in that the integrated device comprises a pump arrangement (18) and a nozzle arrangement (19), wherein the pump arrangement (18) is provided with a receiving compartment (322) for at least partially receiving the nozzle arrangement (19);the pump assembly (18) comprises a pump assembly housing (180) and the pump (11) mates with the pump assembly housing (180), the pump assembly housing (180) comprises an inlet channel (15) positioned upstream of the pump (11) and communicating with the pump (11), and an outlet channel (16) positioned downstream of the pump (11) and communicating with the pump (11), the outlet channel (16) communicating with the nozzle assembly (19), the pump assembly housing (180) comprises a shroud (2) and a first housing positioned below the shroud (2), the shroud (2) is provided with a shroud cavity (21), and the first housing is provided with a pressure sensor receiving opening (313) communicating with the receiving compartment (322);the pump assembly (18) comprises a motor coil (111) for driving the pump (11), a magnetic body (72) for cooperating with the motor coil (111), and a first gear assembly (74) and a second gear assembly (75) that mesh with each other, the first gear assembly (74) comprises a first gear shaft (741) and a first gear (742), the second gear assembly (75) comprises a second gear shaft (751) and a second gear (752), and the first gear meshes with the second gear; the nozzle assembly (19) comprises a nozzle assembly housing (190), the nozzle (12) mates with the nozzle assembly housing (190), and the nozzle assembly further comprises a nozzle coil (121) for driving the nozzle; the integrated device is further provided with a pressure sensor (172) received in the pressure sensor receiving opening (313), the pressure sensor (172) does not have its own housing and the casing (2) serves as a housing for the pressure sensor (172); Integrated device according to claim 1, characterized in that the pump (11) is a urea pump, the nozzle (12) is a urea nozzle and the fluid medium is a urea solution. Integrated device according to claim 1, characterized in that the pump (11) is a fuel pump, the nozzle (12) is a fuel nozzle and the fluid medium is a fuel. Integrated device according to claim 2, characterized in that the integrated device comprises a controller connected to the motor coil (111) and the nozzle coil (121), and the controller independently controls the urea pump and the urea nozzle separately. Integrated device according to claim 2, characterized in that the pressure sensor (172) is connected to the outlet channel (16) and the integrated device further comprises an overflow element (173) connected between the outlet channel (16) and the inlet channel (15). An integrated device according to claim 1, characterized in that the pressure sensor (172) comprises a base plate (176), a circuit board (177) fixed to the base plate (176), a conductor wire connected to the circuit board (177), and a protective cover attached to the circuit board (177), wherein the base plate (176) is provided with a plate body portion and a convex portion extending downward from the plate body portion, a sealing ring (73) is arranged on the convex portion, and the convex portion is provided with a through hole penetrating downward and extending upward through the plate body portion. Integrated device according to claim 6, characterized in that the printed circuit board (177) is provided with a chip at the location corresponding to the through-opening and the protective cover (178) for protecting the chip is attached to the periphery of the chip. Integrated device according to claim 7, characterized in that the protective cover (178) is provided with an opening which communicates with the chip, and the opening communicates with the casing cavity (21). Integrated device according to claim 2, characterized in that the pump assembly housing (180) is provided with a connecting plate assembly (6) which fits with the first housing, the connecting plate assembly (6) comprises a plate portion and a metal cover (72) which is fixed to the plate portion and projects upwards, the magnetic body is accommodated in the metal cover and the motor coil (111) is pushed onto the periphery of the metal cover. Integrated device according to claim 9, characterized in that the pump assembly (18) further comprises an elastic body (71) received in the metal cover (72) and positioned below the magnetic body (72), and the elastic body (71) can be compressed to absorb the volume expansion caused by the urea freezing. Integrated device according to claim 9, characterized in that the plate portion is pressed downwards against the pressure sensor (172). Integrated device according to claim 2, characterized in that the pump assembly housing (180) is provided with a gear groove (43) for receiving the first gear (742) and the second gear (752), the first gear (742) meshes with the second gear (752), one side of the gear groove (43) is provided with a liquid inlet cavity which communicates with the inlet channel (15), and the other side of the gear groove (43) is provided with a liquid outlet cavity (432) which communicates with the outlet channel (16). Integrated device according to claim 2, characterized in that the nozzle assembly comprises a magnetic portion (81) for cooperating with the nozzle coil (121), a valve needle portion (82) positioned below the magnetic portion (81), a spring acting between the magnetic portion (81) and the valve needle portion (82), and a valve seat (84) mating with the valve needle portion (82). Integrated device according to claim 13, characterized in that the nozzle coil (121) is positioned on the periphery of the magnetic section (81), the valve needle section (82) is provided with a valve needle (822) and the valve seat (84) is provided with an injection opening which mates with the valve needle (822). Integrated device according to claim 14, characterized in that the valve seat (84) comprises a swirl disc (85) which is welded to the nozzle assembly housing (190), the injection opening is arranged on the swirl disc (85) and the swirl disc (85) is further provided with a plurality of swirl grooves which are in communication with the injection opening. Integrated device according to claim 2, characterized in that the integrated device is provided with a cooling arrangement for cooling the urea nozzle and the cooling arrangement cools the urea nozzle by a cooling medium. Integrated device according to claim 4, characterized in that the control is provided with a control board, the motor coil (111) and the nozzle coil (121) are electrically connected to the control board, the casing is provided with a through-opening which communicates with the casing cavity (21) and a waterproof and breathable cover (24) fixed in the through-opening; the control board is welded to a line plug (132) and the line plug (132) is exposed outside the casing. The integrated device according to claim 9, characterized in that the first housing comprises a first upper surface, a first lower surface, and a first side surface, the first upper surface being provided with a first annular groove (311), a first island portion (312) surrounded by the first annular groove (311), and a first sealing ring (73) received in the first annular groove (311), the first sealing ring (73) is positioned below the metal cover, the plate portion is pressed downward against the first sealing ring (73), the first island portion is provided with a first positioning hole penetrating the first upper surface and the first lower surface, and a second positioning hole penetrating the first lower surface, and the fuel pump comprises a first shaft sleeve received in the first positioning hole and a second shaft sleeve received in the second positioning hole.wherein the first gear shaft (741) is inserted into the first shaft sleeve and the second gear shaft (751) is inserted into the second shaft sleeve., Integrated device according to claim 18, characterized in that the first lower surface is provided with a first relief groove (321) which communicates with the first positioning opening and the second positioning opening. The integrated device according to claim 18, characterized in that the first island portion (312) further comprises a first distribution groove (3124) penetrating the first upper surface and communicating with the second positioning opening, and a first communication opening penetrating the first upper surface and communicating with the inlet channel (15); the first housing is provided with a second communication opening penetrating the first lower surface and communicating with the liquid inlet cavity, and an outlet opening penetrating the first lower surface and communicating with the liquid inlet cavity. An integrated device according to claim 20, characterized in that the first housing is provided with a spill member receiving groove (319) communicating with the outlet opening, and the integrated device is provided with a spill member (173) installed in the spill member receiving groove (319); when the pressure in the outlet channel (16) is greater than a predetermined value, the spill member (173) is opened to return part of the urea solution to the inlet channel (15). The integrated device of claim 21, characterized in that the pump assembly housing (180) comprises a second housing positioned below and connected to the first housing, the second housing comprising a second upper surface and a second lower surface, and the gear groove (43) penetrates the second upper surface and the second lower surface. The integrated device according to claim 22, characterized in that the pump assembly housing (180) comprises a third housing positioned below the second housing and connected to the second housing, the third housing (5) comprises a body portion (51) and a convex portion (52) extending downward from the body portion (51), the body portion (51) being provided with a third upper surface, the third upper surface being provided with a third annular groove (512) and a third island portion (513) surrounded by the third annular groove (512), the third island portion (513) being provided with a third positioning hole (5111) and a fourth positioning hole (5112) penetrating the third upper surface, and the third positioning hole and the fourth positioning hole extending into the convex portion;the urea pump comprises a third shaft sleeve received in the third positioning hole and a fourth shaft sleeve received in the fourth positioning hole, wherein the first gear shaft (741) is inserted into the third shaft sleeve and the second gear shaft (751) is inserted into the fourth shaft sleeve; Integrated device according to claim 23, characterized in that the third island portion (513) is provided with a second distribution groove (5114) and a third distribution groove (5115) penetrating the third upper surface, the second distribution groove (5114) communicating with the third positioning opening and the third distribution groove communicating with the fourth positioning opening (5112). Integrated device according to claim 23, characterized in that the nozzle assembly housing (190) comprises a main body portion (91) and an extension portion (92) extending downwardly from the main body portion (91), the main body portion (91) is provided with a receiving compartment for receiving the urea nozzle and a groove for receiving the convex portion, and the receiving compartment extends downwardly into the extension portion (92). Integrated device according to claim 25, characterized in that the nozzle assembly comprises a magnetic portion (81) cooperating with the nozzle coil (121), a valve needle portion (82) connected to the magnetic portion (81), and a spring acting on the valve needle portion (82); the extension portion (92) is provided with a current collecting cavity (921) communicating with the receiving compartment, the part of the magnetic portion (81) protruding from the second upper surface being received in the receiving compartment. Integrated device according to claim 26, characterized in that the spring is installed in the magnetic section (81) and the valve needle section (82), the valve needle section (82) is provided with a conical section and a valve needle (822) extending downward from the conical section, the valve needle (822) extends into the current collecting cavity (921), the magnetic section is provided with a first communication opening (811) communicating with the receiving compartment, the valve needle section (82) is provided with a second communication opening (823) communicating with the first communication opening (811), and the conical section is provided with a third communication opening (824) allowing the second communication opening (823) to communicate with the current collecting cavity (921). Integrated device according to claim 27, characterized in that the nozzle assembly comprises a valve seat (84) which mates with the valve needle (822), the valve seat (84) comprises a swirl disc (85) which is welded to the extension section (92), the swirl disc (85) is provided with an injection opening which mates with the valve needle (822) and a plurality of swirl grooves which communicate with the injection opening, and the swirl grooves communicate with the flow collection cavity (921). Integrated device according to claim 28, characterized in that the nozzle assembly housing (190) is provided with a first cooling channel (913), a second cooling channel (914) spaced from the first cooling channel (913), and an end cover sealed at the periphery of the extension section (92), the nozzle assembly housing (190) forms a cooling ring groove communicating with the first cooling channel (913) and the second cooling channel (914) between the end cover and the extension section (92), the first cooling channel is connected to an inlet port for injecting an engine coolant, and the second cooling channel (914) is connected to an outlet port for discharging an engine coolant. An exhaust aftertreatment system comprising an exhaust aftertreatment injection system (200) and an exhaust aftertreatment housing system (300), wherein the injection system comprises the integrated device according to any one of claims 1-29 and the housing system comprises a carrier positioned downstream of the integrated device. A control method for an integrated device, characterized in that the integrated device is the integrated device according to any one of claims 1-29, and the method comprises: driving the pump (11) to suck the fluid medium into the pump (11) through the inlet channel (15); after pressurization by the pump (11), directing the fluid medium through the outlet channel (16) to the nozzle; and when an injection condition is reached, energizing the nozzle coil (121) and at least partially opening the nozzle to inject the fluid medium into the exhaust gas of the engine, wherein the engine coil (111) and the nozzle coil (121) are controlled separately.

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