INTEGRATED DEVICE, EXHAUST-GAS AFTERTREATMENT SYSTEM, AND CONTROL METHOD
An integrated device comprises a pump assembly and a nozzle assembly. The pump assembly has an accommodation compartment for accommodating the nozzle assembly, a pump assembly housing, and a pump. The pump assembly housing has an inlet passage and an outlet passage. The outlet passage is in communication with the nozzle assembly. The pump assembly comprises an enclosure; a motor coil for driving the pump; a magnetic body; a first gear assembly; and a second gear assembly. The first gear assembly and the second gear assembly mesh with each other. The nozzle assembly comprises a nozzle assembly housing, nozzle and a nozzle coil for driving the nozzle. The integrated device includes a pressure sensor that does not have an independent housing. The enclosure serves as a housing of the pressure sensor. The integrated device has a simple and compact structure, and facilitates realization of downsizing of the device. Also disclosed are an exhaust-gas aftertreatment system and a control method.
This application is a request for the priority of the Chinese patent application with the filing date of Jun. 6, 2016, application number of 201610392925.4, and title of invention of “Integrated Device, Exhaust-Gas Aftertreatment System, and Control Method”, the whole content of which is incorporated in this application by reference.
TECHNICAL FIELDThe present invention relates to an integrated device, an exhaust-gas aftertreatment system, and a control method, belonging to the technical field of engine exhaust-gas aftertreatment.
BACKGROUND ARTWith the increasingly stringent emission standards of vehicles using internal combustion engines, in order to reduce the emission of harmful substances such as nitrogen oxides, selective catalytic reduction (SCR) is commonly used as the aftertreatment technology in the industry, and urea solutions are injected into the exhaust gas upstream of the SCR. A urea solution is hydrolyzed and pyrolyzed to produce ammonia and reacts with nitrogen oxides etc. to reduce the concentration of harmful substances.
At present, a urea injection system available on the market is usually an air auxiliary system or a non-air auxiliary system. Certainly, either system comprises a urea tank assembly, a pump supply unit connected to the urea tank assembly through a low-pressure pipe, a nozzle module connected to the pump supply unit through a high-pressure pipe, and a controller. The pump supply unit comprises a urea pump, a pressure sensor, etc., and the nozzle module comprises a urea nozzle, etc. The urea pump and the urea nozzle are spaced apart by a large distance, and are connected to each other through a urea pipe. In addition, a conventional urea injection system comprises a large number of components, and consequently is difficult to install and high-cost.
Therefore, it is urgent to provide a new technical solution.
SUMMARY OF THE PRESENT INVENTIONAn objective of the present invention is to provide an integrated device capable of realizing downsizing of the device, an exhaust-gas aftertreatment system with the integrated device, and a control method.
In order to achieve the above objective, the present invention adopts the following technical solution:
-
- an integrated device comprising a pump and a nozzle, wherein
- the pump is for pumping a fluid medium to the nozzle, the nozzle is for injecting the fluid medium into the exhaust gas of the engine, the integrated device comprises a pump assembly and a nozzle assembly, wherein the pump assembly is provided with an accommodation compartment for at least partially accommodating the nozzle assembly; the pump assembly comprises a pump assembly housing and the pump matching the pump assembly housing, the pump assembly housing comprises an inlet passage located upstream of the pump and in communication with the pump, and an outlet passage located downstream of the pump and in communication with the pump, the outlet passage is in communication with the nozzle assembly, the pump assembly housing comprises an enclosure and a first housing located below the enclosure, the enclosure is provided with an enclosure cavity, and the first housing is provided with a pressure sensor accommodation hole that is in communication with the accommodation compartment; the pump assembly comprises a motor coil for driving the pump, a magnetic body for interacting 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 matching the nozzle assembly housing, and the nozzle assembly further comprises a nozzle coil for driving the nozzle; the integrated device is further provided with a pressure sensor accommodated in the pressure sensor accommodation hole, the pressure sensor does not have an independent housing, and the enclosure serves as a housing of the pressure sensor.
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.
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.
As an improved technical solution of the present invention, the integrated device comprises a controller connected to the motor coil and the nozzle coil, and the controller separately controls the urea pump and the urea nozzle independently.
As an improved technical solution of the present invention, the pressure sensor is in communication with the outlet passage, and the integrated device further comprises an overflow element connected between the outlet passage and the inlet passage.
As an improved technical solution of the present invention, the pressure sensor comprises a base plate, a circuit board fixed on the base plate, a conductive wire connected with the circuit board, and a protective cover fastened on 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 sealing ring is arranged on the convex portion, and the convex portion is provided with a through-hole that penetrates downwards and passes through the plate body portion upwards.
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 mounted on the periphery of the chip to protect the chip.
As an improved technical solution of the present invention, the protective cover is provided with a hole that is in communication with the chip, and the hole is in communication with the enclosure cavity.
As an improved technical solution of the present invention, the pump assembly housing is provided with a connecting plate assembly that matches the first housing, the connecting plate assembly comprises a plate portion and a metal cover that is fixed on the plate portion and protrudes upwards, the magnetic body is accommodated in the metal cover, and the motor coil is sleeved at the periphery of the metal cover.
As an improved technical solution of the present invention, the pump assembly further comprises an elastic body that is accommodated in the metal cover and is positioned below the magnetic body, and the elastic body can be compressed to absorb the volume expansion caused by the freezing of urea.
As an improved technical solution of the present invention, the plate portion is pressed downward against the pressure sensor.
As an improved technical solution of the present invention, the pump assembly housing is provided with a gear groove for accommodating the first gear and the second gear, the first gear meshes with the second gear, one side of the gear groove is provided with a liquid inlet cavity in communication with the inlet passage, and the other side of the gear groove is provided with a liquid outlet cavity in communication with the outlet passage.
As an improved technical solution of the present invention, the nozzle assembly comprises a magnetic portion for interacting with the nozzle coil, a valve needle portion located below the magnetic portion, a spring acting between the magnetic portion and the valve needle portion, and a valve seat matching the valve needle portion.
As an improved technical solution of the present invention, the nozzle coil is positioned at 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 hole matching the valve needle.
As an improved technical solution of the present invention, the valve seat comprises a swirling sheet welded on the nozzle assembly housing, the injection hole is arranged on the swirling sheet, and the swirling sheet is further provided with a plurality of swirling grooves that are in communication with the injection hole.
As an improved technical solution of the present invention, the integrated device is provided with a cooling assembly for cooling the urea nozzle, and the cooling assembly cools the urea nozzle by a cooling medium.
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 with the control board, the enclosure is provided with a through-hole in communication with the enclosure cavity and a waterproof and breathable cover fixed in the through-hole; the control board is welded with a wiring plug, and the wiring plug is exposed outside the enclosure.
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 sealing ring accommodated in the first annular groove, the first sealing ring is positioned below the metal cover, the plate portion is pressed downward against the first sealing ring, the first island portion is provided with a first positioning hole that penetrates the first upper surface and the first lower surface, and a second positioning hole that penetrates the first lower surface, and the urea pump comprises a first shaft sleeve accommodated in the first positioning hole and a second shaft sleeve accommodated 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.
As an improved technical solution of the present invention, the first lower surface is provided with a first relief groove in communication with the first positioning hole and the second positioning hole.
As an improved technical solution of the present invention, the first island portion further comprises a first diversion groove that penetrates the first upper surface and is in communication with the second positioning hole and a first connecting hole that penetrates the first upper surface and is in communication with the inlet passage; the first housing is provided with a second connecting hole that penetrates the first lower surface and is in communication with the liquid inlet cavity and an outlet hole that penetrates the first lower surface and is in communication with the liquid outlet cavity.
As an improved technical solution of the present invention, the first housing is provided with an overflow element accommodation groove that is in communication with the outlet hole, and the integrated device is provided with an overflow element installed in the overflow element accommodation groove; when the pressure in the outlet passage is greater than a preset value, the overflow element is opened to return a part of the urea solution into the inlet passage.
As an improved technical solution of the present invention, the pump assembly housing comprises a second housing located below the first housing and connected with 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.
As an improved technical solution of the present invention, the pump assembly housing comprises a third housing located below the second housing and connected with the second housing, the third housing comprises a body portion and a convex portion that extends downward from the body portion, wherein the body portion is provided with a third upper surface, the third upper surface is provided with a third annular groove and a third island portion surrounded by the third annular groove, the third island portion is provided with a third positioning hole and a fourth positioning hole that penetrate the third upper surface, and the third positioning hole and the fourth positioning hole extend into the convex portion; the urea pump comprises a third shaft sleeve accommodated in the third positioning hole and a fourth shaft sleeve accommodated 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.
As an improved technical solution of the present invention, the third island portion is provided with a second diversion groove and a third diversion groove that penetrate the third upper surface, wherein the second diversion groove is in communication with the third positioning hole, and the third diversion groove is in communication with the fourth positioning hole.
As an improved technical solution of the present invention, the nozzle assembly housing comprises a main body portion and an extension portion that extends downward from the main body portion, the main body portion is provided with an accommodation compartment for accommodating the urea nozzle, and a groove for accommodating the convex portion, and the accommodation compartment extends downward into the extension portion.
As an improved technical solution of the present invention, the nozzle assembly comprises a magnetic portion interacting with the nozzle coil, a valve needle portion connected with the magnetic portion, and a spring acting on the valve needle portion; the extension portion is provided with a current collection cavity that is in communication with the accommodation compartment, wherein the part of the magnetic portion that protrudes from the second upper surface is accommodated in the accommodation compartment.
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 that extends downward from the conical portion, the valve needle extends into the current collection cavity, the magnetic portion is provided with a first communicating hole in communication with the accommodation compartment, the valve needle portion is provided with a second communicating hole in communication with the first communicating hole, and the conical portion is provided with a third communicating hole that allows the second communicating hole to communicate with the current collection cavity.
As an improved technical solution of the present invention, the nozzle assembly comprises a valve seat matching the valve needle, the valve seat comprises a swirling sheet welded on the extension portion, the swirling sheet is provided with an injection hole that matches the valve needle and a plurality of swirling grooves that are in communication with the injection hole, and the swirling grooves are in communication with the current collection cavity.
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 an annular cooling groove that is in communication with the first cooling passage and the second cooling passage between the end cover and the extension portion, the first cooling passage is connected with an inlet connector for injection of an engine coolant, and the second cooling passage is connected with an outlet connector for outflow of an engine coolant.
The present invention also reveals the following technical solution:
-
- an exhaust-gas aftertreatment system, comprising an exhaust-gas
- aftertreatment injection system and an exhaust-gas aftertreatment housing system, wherein, the injection system comprises the integrated device, and the housing system comprises a carrier positioned downstream of the integrated device.
The present invention also reveals the following technical solution:
-
- a control method for an integrated device, wherein the integrated device is the aforementioned integrated device, and the control method comprises:
- driving the pump to suck the fluid medium into the pump through the inlet passage;
- after pressurization by the pump, conveying the fluid medium to the nozzle through the outlet passage;
- 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 of the engine, wherein
- the motor coil and the nozzle coil are separately controlled.
Compared with the prior art, an integrated device comprising a pump and a nozzle according to the present invention integrates the pump and the nozzle very well, has a simple and compact structure, and greatly facilitates installations by customers. On the basis of integrating a urea pump and a urea nozzle in the integrated device, due to the improvement of control precision, the proportion of the urea injected into exhaust gas to nitrogen oxides can be made suitable, thus reducing the crystallization risk caused by excessive urea injection. In addition, the pressure sensor has no independent housing and is realized by an enclosure. Without affecting the function of the sensor, the size of the sensor can be reduced, and the downsizing of the integrated device can be realized.
As shown in
The engine 10 is provided with an engine coolant circulation circuit. As shown in
The integrated device 1 of the present invention is described in detail below.
As shown in
In addition, in order to control the urea pump 11 and the urea nozzle 12 independently, the exhaust-gas aftertreatment system 100 of the present invention is further provided with a controller 13. It can be understood that the controller 13 may be integrated with the integrated device 1 or provided apart from the integrated device 1. As shown in
The integrated device 1 is provided with a housing 14 for accommodating the urea pump 11 and the urea nozzle 12. The embodiment shown in
In addition, the integrated device 1 is provided with a temperature sensor 171 for detecting a temperature. The temperature sensor 171 may be configured to communicate with the inlet passage 15 and/or the outlet passage 16; alternatively, the temperature sensor 171 may be configured to be installed at any position in the integrated device 1. A signal detected by the temperature sensor 171 is transmitted to the controller 13; the controller 13 can improve the injection accuracy of the urea nozzle 12 by a control algorithm designed on the basis of 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 with the outlet passage 16 to detect the pressure in the high-pressure passage at the outlet of the urea pump 11. Because of the integrated design of the present invention, the internal passage is relatively short, and it can be considered that the pressure sensor 172 is 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, which improves the data accuracy and the injection accuracy of the urea nozzle 12.
As shown in
In order to drive the urea pump 11, the urea pump 11 is provided with a motor coil 111 communicating with the controller 13. In order to drive the urea nozzle 12, the urea nozzle 12 is provided with a nozzle coil 121 communicating with the controller 13.
The controller 13 is in communication with the temperature sensor 171 and the pressure sensor 172 to transmit temperature signals and pressure signals to the controller 13. Certainly, in order 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 also obtain the rotational speed of the urea pump 11; certainly, the acquisition 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 high control accuracy.
In addition, in some cases, the urea nozzle 12 needs to be cooled because the engine exhaust has a high temperature and the urea nozzle 12 is installed on the exhaust pipe. The integrated device 1 is further provided with a cooling assembly for this purpose, and the cooling assembly cools the urea nozzle 12 with a cooling medium. The cooling medium can be, but is not limited to, air, and/or an engine coolant, and/or a lubricating oil, and/or urea, etc. As shown in
As shown in
-
- The controller 13 drives the urea pump 11 to operate; the urea solution located in the urea tank 201 is sucked into the urea pump 11 through the inlet passage 15; after pressurization, the urea solution is transported to the urea nozzle 12 through the outlet passage 16, wherein the controller 13 collects and/or calculates signals needed, 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 electrifying the nozzle coil 121, and realizes 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 rotational speed, thereby stabilizing the pressure of the system. In the illustrated embodiment of the present invention, the controller 13 independently controls the urea pump 11 and the urea nozzle 12, respectively.
As shown in
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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 located within the metal cover 62, a first sealing ring 73 located below the metal cover 62, and a first gear assembly 74 and a second gear assembly 75 meshing with each other. Since a gear pump can provide relatively high working pressure, it is conducive to increasing the flow rate of the urea nozzle 12. In addition, a gear pump can also be reversed, which is conducive to the pumping of residual urea solution and reduction of risks of urea crystallization. As shown in
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The first island portion 312 is provided with a first positioning hole 3121 that penetrates the first upper surface 31 and the first lower surface 32, a second positioning hole 3122 that penetrates the first lower surface 32, a first connecting hole 3123 that penetrates the first upper surface 31 and is in communication with the inlet passage 15, and a first diversion groove 3124 that penetrates the first upper surface 31 and is in communication with the second positioning hole 3122. As shown in
In addition, as shown in
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The second housing 4 is positioned below the first housing 3 and connected with the first housing 3. In addition, a plurality of positioning pins 328 are arranged between the first housing 3 and the second housing 4 for better positioning. The second housing 4 comprises a second upper surface 41, a second lower surface 42, and a gear groove 43 that runs through the second upper surface 41 and the second lower surface 42 for accommodating the first gear 742 and the second gear 752. One side of the gear groove 43 is provided with a liquid inlet cavity 431 in communication with the inlet passage 15, and the other side of the gear groove 43 is provided with a liquid outlet cavity 432 in communication with the outlet passage 16. Specifically, the liquid inlet cavity 431 is in communication with the second connecting hole 3127, and the upper end of the liquid outlet cavity 432 is in communication with the outlet hole 3126. In addition, the second upper surface 41 of the second housing 4 is provided with a first accommodating hole 411 through which the nozzle assembly 19 passes, and the second lower surface 42 is provided with a second accommodating hole 421 for positioning the nozzle assembly 19. The second accommodating hole 421 is larger than the first accommodating hole 411 so as to form stepped holes. The nozzle assembly 19 protrudes upwards from the second upper surface 41 and is accommodated in the accommodation compartment 322. With is arrangement, a high-pressure urea solution can be delivered to the urea nozzle 12. In addition, the second upper surface 41 is also provided with a third threading hole 412 corresponding to the second threading hole 323. The first threading hole 618, the second threading hole 323, and the third threading hole 412 are aligned to each other for the passage of the conductive wire 124 of the nozzle assembly 19. The second housing 4 further comprises a plurality of second assembling holes 418 aligned with the first assembling holes 318.
As shown in
In addition, the third island portion 513 is provided with a second diversion groove 5114 and a third diversion groove 5115 arranged on the third upper surface 511, wherein the second diversion groove 5114 is in communication with the third positioning hole 5111, and the third diversion groove 5115 is in communication with the fourth positioning hole 5112. As shown in
During operation, a urea solution enters the liquid inlet passage 332 through the urea connecting pipe 333; one 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 diversion groove 3124 to lubricate the second shaft sleeve 77. The urea solution entering the liquid inlet cavity 431 is divided into two branches. One branch enters the outlet passage 16 after being pressurized by the gear pump. The other branch enters the third positioning hole 5111 and the fourth positioning hole 5112 respectively through the second diversion groove 5114 and the third diversion groove 5115 to lubricate the third shaft sleeve 78 and the fourth shaft sleeve 79, so as to improve the rotational stability of the gear pump and reduce its wear. The high-pressure urea solution entering the outlet passage 16 enters the accommodation compartment 322 along the outlet hole 3126 to flow to the nozzle assembly 19, while a part of the urea solution flows to the overflow element 173. When the pressure is smaller than a preset value of the overflow element 173, the overflow element 173 is closed and is in communication only through the trickle hole 1731; when the pressure is greater than the preset value of the overflow element 173, the overflow element 173 opens, and a part of the urea solution enters the liquid inlet passage 332 to achieve pressure relief.
It is understandable that in the illustrated embodiment of the present invention, the inlet passage 15 comprises the liquid inlet passage 332, the second connecting hole 3127, and the liquid inlet cavity 431. Since the inlet passage 15 is located upstream of the urea pump 11, it is called a low-pressure passage. The outlet passage 16 comprises the liquid outlet cavity 432, the outlet hole 3126, the accommodation compartment 322, etc. Since the outlet passage 16 is located downstream of the urea pump 11, it is called a high-pressure passage.
As shown in
The nozzle assembly housing 190 comprises 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 mounting the integrated device 1 to the exhaust 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 an accommodation compartment 94 for accommodating the urea nozzle 12 and a groove 95 for accommodating the convex portion 52. As shown in
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 passage 141 located in the nozzle assembly housing 190 comprises a first cooling passage 913 running through the fourth side surface 912 and a second cooling passage 914 spaced with the first cooling passage 913, wherein the first cooling passage 913 is connected with the inlet connector 103, and the second cooling passage 914 is connected with the outlet connector 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 on the extension portion 92. With this arrangement, the nozzle assembly housing 190 forms an annular cooling groove 916 that connects the first cooling passage 914 and the second cooling passage 915 between the end cover 96 and the extension portion 92.
In the illustrated embodiment of the present invention, the mounting flange 93 is machined integrally with the main body portion 91. Certainly, in other embodiments, the mounting flange 93 can also be made separately from the main body portion 91 and then they are welded together.
As shown in
As shown in
It is understandable that in other embodiments of the present invention, for example, an integrated device is applied to injecting a fuel into the exhaust of an engine to achieve regeneration of a downstream diesel particulate filter (DPF). In this application, the urea pump 11 can be replaced by a fuel pump, the urea nozzle 12 can be replaced by a fuel nozzle, and the urea solution can be replaced by a fuel. This variation is readily apparent to those of ordinary skill in the art and therefore is not detailed again herein.
For a better understanding of the present invention, the urea pump and the fuel pump are collectively called the pump, the urea nozzle and the fuel nozzle are collectively called the nozzle, and the urea solution and the fuel are collectively called the fluid medium.
Compared with the prior art, the integrated device 1 of the present invention is an integrated design, which can omit or shorten a urea pipe used in the prior art to connect a pump with a nozzle, or omit the plug-ins between various sensors and wire harness in a pump supply unit of the prior art, or require no pyrolyzer, and therefore is highly reliable. The integrated device 1 of the present invention has a compact structure and a small volume, and is convenient for installation in various types of vehicles. In addition, in the integrated device 1 of the present invention, the inner fluid medium passage is short, the pressure drop is small, and the dead volume between the pump and the nozzle is small; therefore, the efficiency is high. The temperature sensor 171 and the pressure sensor 172 are near the nozzle, and the injection pressure precision is high. In addition, through separate control of the pump and the nozzle, nozzle movement driven by pump actions is avoided, and thus the control accuracy is improved. Because of the improved injection accuracy of the nozzle, the amount of urea injected into and out of the exhaust gas can be made proportional to the amount of nitrogen oxides; thus, the crystallization risk caused by excessive injection of urea is reduced. The integrated device 1 of the present invention can adopt water cooling so that the urea residue in the integrated device 1 cannot reach the crystallization point and no crystallization is produced.
While the present invention has been particularly described above with reference to preferred embodiments, it should be understood that said embodiments are not intended to limit the present invention and that those of ordinary skill in the art can make various modifications, equivalent substitutions, and improvements without departing from spirit and scope of the present invention as defined by the Claims.
Claims
1. An integrated device for a pump and a nozzle, wherein the pump is for pumping a fluid medium to the nozzle, and the nozzle is for injecting the fluid medium into the exhaust gas of an engine, the integrated device comprises:
- a pump assembly having an accommodation compartment
- a pump assembly housing for housing the pump, the pump assembly housing comprising an inlet passage located upstream of the pump and in communication with the pump, and an outlet passage located downstream of the pump and in communication with the pump, the pump assembly housing also having an enclosure defining an enclosure cavity and a first housing located below the enclosure, the first housing is provided with a pressure sensor accommodation hole that is in communication with the accommodation compartment,
- a motor coil for driving the pump, a magnetic body for interacting 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;
- a nozzle assembly being at least partially housed in the accommodation compartment having the nozzle, and
- a nozzle assembly housing for housing the nozzle, the nozzle assembly further comprising a nozzle coil for driving the nozzle; the nozzle assembly being in communication with the outlet passage on the pump assembly housing;
- a pressure sensor accommodated in the pressure sensor accommodation hole in the first housing of the enclosure, the pressure sensor not having an independent housing, and the enclosure serving as a housing of the pressure sensor; and
- a controller connected to the motor coil and the nozzle coil, and the controller separately controlling the pump and the nozzle independently.
2. The integrated device as claimed in claim 1, wherein the pump is a urea pump, the nozzle is a urea nozzle, and the fluid medium is a urea solution.
3. (canceled)
4. (canceled)
5. The integrated device as claimed in claim 2, wherein the pressure sensor is in communication with the outlet passage, and the integrated device further comprises an overflow element connected between the outlet passage and the inlet passage.
6. The integrated device as claimed in claim 1, wherein the pressure sensor comprises a base plate, a circuit board fixed on the base plate, a conductive wire connected with the circuit board, and a protective cover fastened on 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 sealing ring is arranged on the convex portion, and the convex portion is provided with a through-hole that penetrates downwards and passes through the plate body portion upwards.
7. The integrated device as claimed in claim 6, wherein the circuit board is provided with a chip at the position corresponding to the through-hole, and the protective cover is mounted on the periphery of the chip to protect the chip and the protective cover is provided with a hole that is in communication with the chip, and the hole is in communication with the enclosure cavity.
8. (canceled)
9. The integrated device as claimed in claim 2, wherein the pump assembly housing is provided with a connecting plate assembly that matches the first housing, the connecting plate assembly comprises a plate portion and a metal cover that is fixed on the plate portion and protrudes upwards, the magnetic body is accommodated in the metal cover, and the motor coil is sleeved at the periphery of the metal cover.
10. The integrated device as claimed in claim 9, wherein the pump assembly further comprises an elastic body that is accommodated in the metal cover and is positioned below the magnetic body, and the elastic body can be compressed to absorb the volume expansion caused by the freezing of urea.
11. (canceled)
12. The integrated device as claimed in claim 2, wherein the pump assembly housing is provided with a gear groove for accommodating the first gear and the second gear, the first gear meshes with the second gear, one side of the gear groove is provided with a liquid inlet cavity in communication with the inlet passage, and the other side of the gear groove is provided with a liquid outlet cavity in communication with the outlet passage.
13. The integrated device as claimed in claim 2, wherein the nozzle assembly comprises a magnetic portion for interacting with the nozzle coil, a valve needle portion located below the magnetic portion, a spring acting between the magnetic portion and the valve needle portion, and a valve seat matching the valve needle portion.
14. The integrated device as claimed in claim 13, wherein the nozzle coil is positioned at 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 hole matching the valve needle and the valve seat is provided a swirling sheet welded on the nozzle assembly housing, the injection hole is arranged on the swirling sheet, and the swirling sheet is further provided with a plurality of swirling grooves that are in communication with the injection hole.
15. (canceled)
16. The integrated device as claimed in claim 2, wherein the integrated device is provided with a cooling assembly for cooling the urea nozzle, and the cooling assembly cools the urea nozzle by a cooling medium.
17. The integrated device as claimed in claim 1, wherein the controller is provided with a control board, the motor coil and the nozzle coil are electrically connected with the control board, the enclosure is provided with a through-hole in communication with the enclosure cavity and a waterproof and breathable cover fixed in the through-hole; the control board is welded with a wiring plug, and the wiring plug is exposed outside the enclosure.
18. The integrated device as claimed in claim 9, wherein 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 sealing ring accommodated in the first annular groove, the first sealing ring is positioned below the metal cover, the plate portion is pressed downward against the first sealing ring, the first island portion is provided with a first positioning hole that penetrates the first upper surface and the first lower surface, and a second positioning hole that penetrates the first lower surface, and the urea pump comprises a first shaft sleeve accommodated in the first positioning hole and a second shaft sleeve accommodated 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.
19. (canceled)
20. The integrated device as claimed in claim 18, wherein the first island portion further comprises a first diversion groove that penetrates the first upper surface and is in communication with the second positioning hole and a first connecting hole that penetrates the first upper surface and is in communication with the inlet passage; the first housing is provided with a second connecting hole that penetrates the first lower surface and is in communication with the liquid inlet cavity and an outlet hole that penetrates the first lower surface and is in communication with the liquid outlet cavity.
21. The integrated device as claimed in claim 20, wherein the first housing is provided with an overflow element accommodation groove that is in communication with the outlet hole, and the integrated device is provided with an overflow element installed in the overflow element accommodation groove; when the pressure in the outlet passage is greater than a preset value, the overflow element is opened to return a part of the urea solution into the inlet passage.
22. The integrated device as claimed in claim 21, wherein the pump assembly housing comprises a second housing located below the first housing and connected with 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.
23. The integrated device as claimed in claim 22, wherein the pump assembly housing comprises a third housing located below the second housing and connected with the second housing, the third housing comprises a body portion and a convex portion that extends downward from the body portion, wherein the body portion is provided with a third upper surface, the third upper surface is provided with a third annular groove and a third island portion surrounded by the third annular groove, the third island portion is provided with a third positioning hole and a fourth positioning hole that penetrate the third upper surface, and the third positioning hole and the fourth positioning hole extend into the convex portion; the urea pump comprises a third shaft sleeve accommodated in the third positioning hole and a fourth shaft sleeve accommodated 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.
24. (canceled)
25. The integrated device as claimed in claim 23, wherein the nozzle assembly housing comprises a main body portion and an extension portion that extends downward from the main body portion, the main body portion is provided with an accommodation compartment for accommodating the urea nozzle, and a groove for accommodating the convex portion, and the accommodation compartment extends downward into the extension portion.
26. The integrated device as claimed in claim 25, wherein the nozzle assembly comprises a magnetic portion interacting with the nozzle coil, a valve needle portion connected with the magnetic portion, and a spring acting on the valve needle portion; the extension portion is provided with a current collection cavity that is in communication with the accommodation compartment, wherein the part of the magnetic portion that protrudes from the second upper surface is accommodated in the accommodation compartment.
27-30. (canceled)
31. A method for controlling an integrated device comprising a pump assembly having an accommodation compartment, a pump, a pump assembly housing for housing the pump, the pump assembly housing comprising an inlet passage located upstream of the pump and in communication with the pump, and an outlet passage located downstream of the pump and in communication with the pump, the pump assembly housing also having an enclosure defining an enclosure cavity and a first housing located below the enclosure, the first housing is provided with a pressure sensor accommodation hole that is in communication with the accommodation compartment; a nozzle assembly being at least partially housed in the accommodation compartment having a nozzle, and a nozzle assembly housing for housing the nozzle, the nozzle assembly further comprising a nozzle coil for driving the nozzle; the nozzle assembly being in communication with the outlet passage on the pump assembly housing; a pressure sensor accommodated in the pressure sensor accommodation hole in the first housing of the enclosure, the pressure sensor not having an independent housing, and the enclosure serving as a housing of the pressure sensor; and a controller connected to the motor coil and the nozzle coil, and the controller for controlling the pump and the nozzle, the control method comprising:
- driving the pump to suck the fluid medium into the pump through the inlet passage;
- after pressurization by the pump, conveying the fluid medium to the nozzle through the outlet passage;
- 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 of the engine, wherein
- the motor coil and the nozzle coil are separately controlled.
Type: Application
Filed: Apr 11, 2017
Publication Date: Sep 26, 2019
Inventors: Xuelang WANG (Jiangsu), Gaofeng FAN (Jiangsu), Zhenqiu YANG (Jiangsu), Weibo PENG (Jiangsu), Hongwei SONG (Jiangsu), Guoli CHEN (Jiangsu)
Application Number: 16/307,228