Integrated device, exhaust-gas aftertreatment system, and control method

Abstract

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.

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.