CN113606046B - Exhaust throttle valve of diesel engine - Google Patents
Exhaust throttle valve of diesel engine Download PDFInfo
- Publication number
- CN113606046B CN113606046B CN202110709609.6A CN202110709609A CN113606046B CN 113606046 B CN113606046 B CN 113606046B CN 202110709609 A CN202110709609 A CN 202110709609A CN 113606046 B CN113606046 B CN 113606046B
- Authority
- CN
- China
- Prior art keywords
- motor
- diesel engine
- throttle valve
- valve
- valve plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
- F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
- F02D9/1065—Mechanical control linkage between an actuator and the flap, e.g. including levers, gears, springs, clutches, limit stops of the like
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
The application provides a diesel engine exhaust throttle valve applied to the technical field of diesel vehicle power train systems, wherein a throttle valve body (1) of the diesel engine exhaust throttle valve comprises an actuator (2) and a butterfly valve (3), and a whole vehicle ECM (electro-magnetic control) is arranged to be capable of sending a valve plate opening command to the throttle valve body (1) under idle speed or low load working conditions, so that a motor (25) of the throttle valve body (1) is controlled to rotate, and the motor (25) drives a valve plate (33) to rotate towards the direction of reducing the valve plate opening. According to the exhaust throttle valve of the diesel engine, when the diesel engine is in the working condition of low exhaust temperature such as idling and low load, the opening degree of the valve plate of the throttle valve can be accurately and timely reduced to improve exhaust back pressure, and the exhaust temperature is improved by combining with an oil injection strategy of the diesel engine, so that the catalytic conversion efficiency of a post-processing unit is improved, pollutant emission is reduced, and finally emission is ensured to meet the requirement of emission regulations.
Description
Technical Field
The application belongs to the technical field of diesel vehicle power assembly systems, and particularly relates to an exhaust throttle valve of a diesel engine.
Background
In recent years, as diesel vehicle emissions regulations have become more stringent, particularly with regard to emissions of pollutants at idle and low loads, corresponding pollutant limit requirements have been or will come out of the counter. The catalytic efficiency of the existing diesel vehicle aftertreatment unit has certain temperature discharge requirements, the low temperature discharge catalytic efficiency is low, the pollutant emission exceeds the standard, and the diesel vehicle aftertreatment unit is particularly obvious under idle speed and low load working conditions.
The prior art route is mainly to use EGR technology, i.e. exhaust gas recirculation technology. And (3) part of exhaust gas in the exhaust manifold is led back to the EGR cooler, cooled to the target temperature and then led into the intake manifold, and finally burned in the combustion chamber. The technical route can reduce the temperature of the combustion chamber, further reduce the generation amount of NOx, finally reduce pollutant emission and meet the requirements of emission regulations. However, the EGR system is composed of valves, coolers, pipelines, controllers and the like, is complex in system and high in cost, and has insufficient technical maturity and reliability, so that the requirements of the diesel engine cannot be met effectively.
Disclosure of Invention
The technical problems to be solved by the application are as follows: aiming at the defects of the prior art, the exhaust throttle valve of the diesel engine is simple in structure, can accurately and timely reduce the valve plate opening of the throttle valve to promote exhaust back pressure and combine with the diesel engine oil injection strategy to promote exhaust temperature when the diesel engine is in the working condition of low exhaust temperature such as idling and low load, and further improves the catalytic conversion efficiency of a post-processing unit, reduces pollutant emission, and finally ensures that the emission meets the requirements of emission regulations.
The technical scheme adopted by the application is as follows:
the application relates to an exhaust throttle valve of a diesel engine, which comprises an actuator and a butterfly valve, wherein a motor is arranged in a shell of the actuator, a motor gear of the motor is meshed with a large gear of an intermediate gear, the large gear is meshed with a small gear of the intermediate gear, the small gear is meshed with a driving gear, the driving gear is connected with a driving gear shaft, the driving gear shaft is connected with a valve plate of the butterfly valve through a driving arm, a magnet is arranged above the driving gear, the magnet is arranged to feed back an angle position signal of the driving gear shaft to a Hall angle position sensor in real time, the Hall angle position sensor is connected with an ECM (electro-magnetic control) of the whole vehicle, and the ECM of the diesel engine is arranged to send a valve plate opening command to the throttle valve body when in an idle or low-load working condition, so that the motor of the throttle valve body is controlled to rotate, and the motor drives the valve plate to rotate towards a valve plate opening reducing direction.
When the motor drives the valve plate to rotate in the valve plate opening reducing direction, the rotation angle of the motor is output through rotation angle torque output after reduction and torque increase of a gear set formed by the motor gear, the intermediate gear and the driving gear, the valve shaft is driven to drive the valve plate to rotate through transmission of the driving arm and the driving turntable, when the valve plate rotates in the valve plate opening reducing direction, the valve plate opening is reduced, the exhaust back pressure is increased, at the moment, the diesel engine is simultaneously increased to spray oil to keep normal torque output of the diesel engine, and the exhaust temperature can be increased to reach a target temperature value required by post-treatment catalytic conversion.
The butterfly valve is arranged in a structure that the rotation angle torque input transmitted by the driving arm clamping groove of the driving turntable clamping jaw receiving actuator overcomes the screwing resistance of the return spring and drives the valve shaft and the valve plate to rotate to the target angle position.
The actuator comprises a shell, a water inlet and outlet pipe, an outer cover sealing ring, a motor, a wave spring, a motor flange, a gear set, a shafting, a driving arm, a magnet and a PCB, wherein the shafting, the driving arm, the magnet and the PCB are formed by a middle gear shaft and a driving gear shaft, the PCB comprises a Hall angle position sensor, an electronic component, a motor pin needle and a pin needle, and a cooling water channel is arranged in the shell.
The exhaust throttle valve of the diesel engine further comprises a connecting part, wherein the connecting part is arranged to be capable of connecting the structure of the actuator and the butterfly valve, the connecting part is simultaneously arranged to be capable of being in heat insulation and flexible connection, and the connecting part comprises a bracket, a sleeve, a wire gasket, a bolt and nut fastener I and a bolt and nut fastener II.
The outer cover and the shell of the actuator of the exhaust throttle valve of the diesel engine are fixedly connected through a spring buckle or an outer cover screw, the outer cover sealing ring is grooved and embedded in the outer cover, PPS or PBT is selected as a material of the outer cover, glass fibers are added, injection molding is adopted for the outer cover, and EPDM is selected as a material of the outer cover sealing ring.
The motor is a direct current brush motor or a brushless motor, a wave spring is additionally arranged between the motor and the shell, an inner hole of a motor flange and the outer wall surface of a bearing chamber of the motor are in interference press fit together, and then the motor is rigidly connected to the shell through a fastener.
The wave spring is made of metal materials, the motor flange adopts a plastic coating forming process, the pin needle is embedded in the middle of the wave spring, and the pin needle is used for connecting the motor terminal and the motor pin needle.
The motor comprises a motor gear shaft, the motor gear shaft and the motor are integrally manufactured, the intermediate gear shaft is pressed on the actuator shell in an interference mode, the driving gear is assembled with the shell through a bearing and/or a shaft sleeve, the bearing shaft sleeve is subjected to seal design, and the intermediate gear shaft is pressed in the shaft hole of the shell in an interference mode.
The magnet and the magnet seat are integrally manufactured and formed through plastic coating, the magnet seat is sleeved on the driving gear shaft and fixed by virtue of the pin, the magnet is manufactured by adopting a magnetic permeability material, and the magnet seat and the pin are generally formed by adopting an injection molding process.
By adopting the technical scheme of the application, the following beneficial effects can be obtained:
according to the exhaust throttle valve of the diesel engine, under the high-load working condition, the diesel vehicle does not have the requirements of improving exhaust back pressure and exhaust temperature, and at the moment, the valve plate of the throttle valve body is in the full-open position, so that the power performance of the whole vehicle is not influenced. When a diesel vehicle is operated in an idle or low load condition, the exhaust temperature of the engine generally does not reach a target temperature value required for catalytic conversion of the aftertreatment unit. In such a case, the problems described in the background art may occur. Therefore, the application improves, when the diesel vehicle runs under idle speed or low load working condition, the valve plate opening command is calculated and sent to the throttle valve body (exhaust throttle valve) through the whole vehicle ECM, the motor is controlled to rotate, the motor rotates to drive the valve plate to rotate towards the direction of reducing the valve plate opening, the rotation angle torque is output after the gear set is used for reducing speed and increasing torque, then the valve shaft and the valve plate are driven to rotate through the connection of the driving arm and the driving turntable, the valve plate opening is reduced, the exhaust back pressure is increased, the diesel engine simultaneously keeps normal torque output through multiple oil injection, and the exhaust temperature of the engine is rapidly increased to reach the target temperature value required by post-treatment catalytic conversion, so that the pollutant emission is reduced, and the environmental protection regulation requirement is met. When the load of the whole vehicle rises, after the normal exhaust temperature is enough to maintain the high-efficiency catalytic conversion of the post-processing unit, the valve plate of the throttle valve body returns to the full-open position under the control of the ECM of the whole vehicle or under the action of the return spring, so that the power output of the whole vehicle is not influenced. According to the exhaust throttle valve of the diesel engine, when the diesel engine is in the working condition of low exhaust temperature such as idling and low load, the opening degree of the valve plate of the throttle valve can be accurately and timely reduced to improve exhaust back pressure, and the exhaust temperature is improved by combining with an oil injection strategy of the diesel engine, so that the catalytic conversion efficiency of a post-processing unit is improved, pollutant emission is reduced, and finally emission is ensured to meet the requirement of emission regulations.
Drawings
The following is a brief description of what is expressed in the drawings of this specification and the references in the drawings:
FIG. 1 is a schematic diagram of an assembly of an exhaust throttle valve for a diesel engine according to the present application;
FIG. 2 is a schematic cross-sectional view of an exhaust throttle valve for a diesel engine according to the present application;
FIG. 3 is a schematic diagram of the actuator of the exhaust throttle valve of the diesel engine according to the present application;
FIG. 4 is a schematic view of a partially cut-away configuration of an actuator of an exhaust throttle valve for a diesel engine according to the present application;
FIG. 5 is a schematic view of the structure of a butterfly valve of an exhaust throttle valve of a diesel engine according to the present application;
FIG. 6 is a schematic cross-sectional view of a butterfly valve of an exhaust throttle valve of a diesel engine in accordance with the present application;
FIG. 7a is a schematic view of the connection of an exhaust throttle valve for a diesel engine according to the present application;
FIG. 7b is a schematic view of the connection of the exhaust throttle valve of the diesel engine according to the present application;
the reference numerals in the figures are respectively: 1. a throttle valve body; 2. an actuator; 3. butterfly valve; 4. a connection part; 5. an outer cover; 6. an outer cover screw; 7. a water inlet pipe and a water outlet pipe; 8. a drive gear shaft; 9. a driving arm; 10. a housing; 11. pin needles; 12. a motor pin needle; 13. an intermediate gear shaft; 14. a PCB; 15. a hall angle position sensor; 16. self-tapping screw; 17. a magnet; 18. a magnet base; 19. a pin; 20. a drive gear; 21. a shaft sleeve; 22. a thrust washer; 23. a bearing; 24. an intermediate gear; 25. a motor; 26. a wave spring; 27. a motor flange; 28. an outer cover sealing ring; 29. a motor gear; 30. driving a turntable; 31. a return spring; 32. butterfly valve shell; 33. a valve plate; 34. a valve shaft; 35. an upper liner cap; 36. an upper bushing; 37. a sealing gasket; 38. a lower bushing; 39. a lower bushing cover; 40. a bracket; 41. a wire washer; 42. a sleeve; 43. a bolt and nut fastener I; 44. bolt-nut fastener II.
Detailed Description
The following describes the shape, structure, mutual position and connection relation between parts, action of parts and working principle of the specific embodiment of the present application by describing examples in further detail:
as shown in fig. 1-6, the application is a diesel engine exhaust throttle valve, the throttle body 1 of the diesel engine exhaust throttle valve comprises an actuator 2 and a butterfly valve 3, a motor 25 is arranged in a shell 10 of the actuator 2, a motor gear 29 of the motor 25 is meshed with a large gear of an intermediate gear 24, the large gear is meshed with a small gear of the intermediate gear 24, the small gear is meshed with a driving gear 20, the driving gear 20 is connected with a driving gear shaft 8, the driving gear shaft 8 is connected with a valve plate 33 of the butterfly valve 2 through a driving arm 9, a magnet 17 is arranged above the driving gear 20, the magnet 17 is arranged to feed back an angle position signal of the driving gear shaft 8 to a hall angle position sensor 15 in real time, the hall angle position sensor 15 is connected with an entire car ECM, and the diesel engine is arranged to send a valve plate opening command to the throttle body 1 in idle or low load working condition, so that the motor 25 of the throttle body 1 is controlled to rotate, and the motor 25 drives the valve plate 33 to rotate in a direction of reducing the opening of the valve plate 33. The structure provides an improvement scheme aiming at the defects in the prior art. In the running process of the diesel vehicle, particularly under the high-load working condition, the requirements of improving the exhaust back pressure and the exhaust temperature are not met, and at the moment, the valve plate 33 of the throttle valve body 1 is in the fully-opened position, so that the power performance of the whole vehicle is not influenced. When a diesel vehicle is operated in an idle or low load condition, the exhaust temperature of the engine generally does not reach a target temperature value required for catalytic conversion of the aftertreatment unit. In such a case, the problems described in the background art may occur. Therefore, the application improves, when the diesel vehicle runs under idle speed or low load working condition, the valve plate opening command is calculated and sent to the throttle valve body (exhaust throttle valve) 1 through the whole vehicle ECM, the motor is controlled to rotate, the motor 25 rotates to drive the valve plate to rotate towards the direction of reducing the valve plate opening, the rotation angle torque is output after the gear set is used for reducing speed and increasing torque, the valve shaft 34 is driven to rotate with the valve plate 33 through the connection of the driving arm 9 and the driving turntable 30, the valve plate 33 opening is reduced, the exhaust back pressure is increased, the diesel engine simultaneously maintains normal torque output through multi-oil injection, and the exhaust temperature of the engine is rapidly increased to reach the target temperature value required by post-treatment catalytic conversion, so that the pollutant emission is reduced, and the environmental protection regulation requirement is met. When the load of the whole vehicle rises, after the normal exhaust temperature is enough to maintain the high-efficiency catalytic conversion of the post-processing unit, the valve plate 33 of the throttle valve body returns to the fully open position under the control of the ECM of the whole vehicle or under the action of the return spring 31, so that the power output of the whole vehicle is not influenced. The exhaust throttle valve of the diesel engine has a simple structure, can accurately and timely reduce the valve plate opening of the throttle valve to promote exhaust back pressure and combine with the diesel engine oil injection strategy to promote exhaust temperature when the diesel engine is in the working condition of low exhaust temperature such as idling and low load, thereby improving the catalytic conversion efficiency of a post-processing unit, reducing pollutant emission, finally ensuring that the emission meets the requirement of emission regulations and improving the engine performance.
When the motor 25 drives the valve plate 33 to rotate in the opening decreasing direction of the valve plate 33, the rotation angle of the motor 25 is output through the rotation angle torque output after the gear set formed by the motor gear 29, the intermediate gear 24 and the driving gear 20 is decelerated and torque-increased, then the valve plate 33 is driven to rotate by the driving arm 9 and the driving turntable 30, when the valve plate 33 rotates in the opening decreasing direction of the valve plate 33, the opening of the valve plate 33 is decreased, the back pressure of exhaust gas is increased, at the moment, the diesel engine is simultaneously increased to increase the torque output for injecting fuel to keep the diesel engine normal, and the exhaust temperature can be increased to reach the target temperature value required by post-treatment catalytic conversion. According to the structure, when the diesel vehicle runs under the idle speed or low load working condition, interference is performed, the valve plate 33 is controlled to rotate, the opening degree of the valve plate 33 is reduced, the back pressure of exhaust gas is increased, the diesel engine maintains normal torque output through multiple oil injection, and the exhaust temperature of the engine is rapidly increased to reach a target temperature value required by post-treatment catalytic conversion, so that pollutant emission is reduced, and the requirement of environmental protection regulations is met.
The butterfly valve 3 is arranged in a structure that the rotation angle torque input transmitted by the clamping groove of the driving arm 9 of the actuator 2 can be received through the clamping jaw of the driving turntable 30, the screwing resistance of the return spring 31 is overcome, and the valve shaft 34 and the valve plate 33 are driven to rotate to the target angle position. In the above configuration, the flow area of the exhaust passage of the butterfly valve case 32 is reduced, and the exhaust back pressure is increased. The butterfly valve 3 includes a butterfly valve housing 32, a valve shaft 34, a valve plate 33, bushings (36/38) (1 each up and down), bushing covers (35/39) (1 each up and down), a seal gasket 37, a return spring 31, and a drive turntable 30. The drive rotor 30, the valve shaft 34 and the valve plate 33 are rigidly connected, typically by welding. The butterfly valve 3 is a normally open valve, and exhaust gas can flow freely when the valve plate 33 is fully opened; when the opening degree of the valve plate 33 is reduced, the exhaust gas flow is restricted, and the exhaust back pressure at the same flow rate is significantly increased. The upper and lower shaft holes of the butterfly valve housing 32 need to be sealed. The two bushings (36/38) of the butterfly valve 3 are assembled with the shaft hole of the housing 32 in an interference press fit mode, the diameter of the upper end of the valve shaft 34 is smaller, the diameter of the lower end of the valve shaft 34 is larger through the upper bushing 36, the diameter of the lower end of the valve shaft 34 is larger through the lower bushing 38, and the side wall surface of the valve shaft 34 is in small clearance fit with the inner walls of the two bushings (36/38). The bushing (36/38) is made of graphite, soft copper, steel and other materials, and is preferably made of graphite, so that the graphite has self-lubricating property and is favorable for antifriction and noise reduction design; the valve shaft 34 is made of wear-resistant and high-temperature-resistant stainless steel; the butterfly valve housing 32 is cast from a high temperature resistant stainless steel material. The two bushing covers (35/39) are pressed onto the corresponding shaft holes of the shell 32, the upper end of the valve shaft 34 penetrates out of the inner hole of the upper bushing cover 35, the two bushing covers are in small clearance fit, the upper bushing cover 35 cannot influence the rotation of the valve shaft 34 and cannot generate friction noise, and then the outer edge sealing can be carried out by adopting the processes of welding (preferably laser welding, attractive welding appearance, low welding temperature, small heat influence on surrounding parts) or spin riveting and the like, so that the leakage of high-temperature exhaust is prevented. The lower shaft hole may also be blind hole type, eliminating the investment of the lower bushing cover 39. The two bushing caps (35/39) are made of high-temperature resistant stainless steel.
The sealing between the upper end of the valve shaft 34 of the butterfly valve 3 and the inner hole of the upper bushing cover 35 is realized by pressing and attaching the sealing gasket 37 and the step surface of the valve shaft 34, the upper part of the valve shaft 34 and the driving turntable 30 are welded together, preferably laser welding is performed, the welding appearance is attractive, the welding temperature is low, and the thermal influence on surrounding parts is small. The return spring 31 is sleeved on the outer wall surface of the upper shaft hole of the butterfly valve shell 32, the lower part of the return spring is provided with a butterfly valve shell 32 supporting platform, a lower support arm of the return spring 31 is fixed on the butterfly valve shell 32 by a limiting structure, an upper support arm is clamped into the limiting structure arranged on the driving turntable 30, a certain axial pretightening force is kept after the return spring 31 is installed, the valve shaft 34 is lifted upwards, the step surface of the valve shaft 34 is tightly pressed on the inclined plane of the sealing gasket 37, and the leakage amount of high-temperature exhaust is minimized. The stepped surface of the valve shaft 34 is preferably designed in a spherical shape, and the sealing gasket 37 needs to be provided with an inclined plane at a corresponding position, so that after a period of operation, the sealing position can be developed into a surface seal from an initial linear seal, and the sealing effect is better along with the increase of the abrasion quantity of the abrasion surface. The gasket 37 is preferably made of abrasion-resistant and high temperature-resistant stainless steel. The valve shaft 34 and the valve plate 33 are welded together, and laser welding or argon arc welding can be adopted. The return spring 31 also maintains a certain pretightening force in the torsion direction after being installed, and the valve plate 33 is in a normally open position under the cooperation of the limiting structure of the shell 32 and the limiting structure of the driving turntable 30. The valve closing direction is the tightening direction of the return spring 31. The valve plate 34 is typically cast from high temperature resistant stainless steel, and the return spring 31 is typically bent from SUS301, su304, or X718, X750, etc.
The actuator 2 comprises a shell 10, a water inlet and outlet pipe 7, an outer cover 5, an outer cover sealing ring 28, a motor 25, a wave spring 26, a motor flange 27, a shaft system formed by a gear set, an intermediate gear shaft 13 and a driving gear shaft 8, a driving arm 9, a magnet 17 and a PCB14, wherein the PCB14 comprises a Hall angle position sensor 15, an electronic component, a motor pin needle 12 and a pin needle 11, and a cooling water channel is arranged in the shell. The hall angle position sensor 15, the matched electronic components (such as a capacitor, an inductor, a diode and the like), the motor pin needle 12 and the pin needle 11 can be welded on a PCB14, the PCB14 is then installed on the outer cover 5 by using a tapping screw 16, a screw column corresponding to a screw hole position is required to be arranged on the outer cover 5, the position of the induced magnetic field on the hall angle position sensor 15 is required to be opposite to the center of the magnet 17, and a gap between the hall angle position sensor 15 and the magnet 17 is required to meet design requirements. Another solution is to integrally injection mold a conductive wire frame (not shown in the drawing) as an insert of the outer cover 5, then weld the hall angle position sensor 15, the matched electronic components (such as capacitor, inductor, diode, etc.), the motor pin needle 12 and the pin needle 11, and finally fix the outer cover 5 by glue filling, thereby omitting the investment of the PCB14 and the tapping screw 16.
As shown in fig. 7a and 7b, the exhaust throttle valve for a diesel engine further comprises a connecting portion 4, the connecting portion 4 is configured to be capable of connecting the actuator 2 and the butterfly valve 3, the connecting portion 4 is simultaneously configured to be capable of being thermally insulated and flexibly connected, and the connecting portion 4 comprises a bracket 40, a sleeve 42, a wire washer 41, a bolt-nut fastener i 43 and a bolt-nut fastener ii 44. In the above structure, the connection part 4 plays a role of heat insulation mainly depending on the design of the structure and the size of the bracket 40, and in addition, the contact structure between the driving arm 9 of the actuator and the driving turntable 30 of the butterfly valve is small, so that the influence of heat transfer is considered to be minimum; the flexible connection is mainly realized by the wire gasket 41, so that vibration and noise can be reduced.
The outer cover 5 of the actuator 2 of the exhaust throttle valve of the diesel engine is fixedly connected with the shell 10 through a spring buckle or an outer cover screw 6, an outer cover sealing ring 28 is embedded in a groove on the outer cover 5, PPS or PBT is selected as a material of the outer cover 5, glass fibers are added, injection molding is adopted for the outer cover 5, and EPDM is selected as a material of the outer cover sealing ring 28. The above-described structure, the outer cover seal 28 may be in the form of an O-ring, an X-ring, or other shaped design. The material of the outer cover 5 of the actuator is usually PPS or PBT, glass fiber is added, and injection molding is adopted; the cover seal 28 is typically EPDM. The actuator housing 10 also has a waterway design, the waterway is usually completed together when the housing 10 is die-cast, the die-cast aluminum material is selected, the water inlet and outlet pipe 7 is arranged, the water inlet and outlet pipe 7 and the housing 10 are also required to be sealed, a sealing ring is generally adopted or the water inlet and outlet pipe 7 is directly pressed on the housing 10 and welded and fastened, preferably laser welding is adopted, the welding appearance is attractive, and the overall welding strength is reliable.
The motor 25 is a direct current brush motor or a brushless motor, a wave spring 26 is additionally arranged between the motor 25 and the shell 10, an inner hole of a motor flange 27 is in interference press fit with the outer wall surface of a bearing chamber of the motor 25, and then the motor flange is rigidly connected to the shell 10 through a fastener. In the above structure, the positioning of the motor 25 is completed by the motor flange 27 and the structure on the housing 10, and the positioning of the other end of the motor 25 is completed by the bearing chamber outer wall surface and the inner cylindrical surface processed at the corresponding position of the housing 10.
The wave spring 26 is made of metal material, the motor flange 27 is formed by plastic molding, and a pin needle (not shown in the drawing) is inserted in the middle of the wave spring, and the pin needle is used for connecting a motor terminal (not shown in the drawing) and the motor pin needle 12. It is also possible that the shaft extension is fixedly mounted directly to the housing 10 by means of a resilient motor flange (not shown) and fasteners (not shown).
The gear set (drive train) (29/24/20) adopts a spur gear drive design, a spur helical gear drive design or other drive types can be adopted, and the drive types mainly depend on space arrangement requirements. The gear ratio and number of steps of the gear set are selected primarily by the design of both the motor 25 type (motor characteristic) and the output torque demand, with the present solution in the drawing being a two-stage spur gear transmission with a ratio of 36.5. The motor gear 29 is generally pressed on the shaft of the motor 25 in an interference manner, the position of the motor gear 29 is precisely positioned by means of a limiting tool during pressing, and the motor gear 29 is generally manufactured and formed by adopting a powder metallurgy process. The intermediate gear 24 is directly in small clearance fit with the intermediate gear shaft 13, the position of the intermediate gear 24 is accurately positioned by means of the planar engagement of the lower end surface of the gear 24 and the corresponding plane of the shell 10, the intermediate gear 24 is generally manufactured by adopting an injection molding process, materials such as PA46, PA66, PPA and the like are selected, and a proper amount of glass fiber and wear-resistant material PTFE are added. The driving gear 20 is usually designed by adopting sector teeth, and two side surfaces are limited by a limit structure arranged at the corresponding position of the shell 10, so that the maximum rotation angle of the driving gear 20 (namely the driving shaft 8 and the driving arm 9) is determined, the driving gear 20 is usually welded with the driving gear shaft 8, preferably laser welding is performed, the welding temperature is low, the welding deformation is small, and the thermal influence on peripheral parts is small. The driving gear 20 adopts a plastic coating forming process, and the materials can be PA46, PA66, PPS and the like, and a proper amount of glass fiber is added; the insert (not shown in the drawings) is made of a metal material.
The motor 25 comprises a motor gear shaft, the motor gear shaft and the motor 25 are integrally manufactured, the intermediate gear shaft 13 is pressed on the actuator shell 10 in an interference fit manner, the driving gear 20 is assembled with the shell 10 through a bearing 23 and/or a shaft sleeve 21, and the bearing shaft sleeve is in sealing design (such as a sealing ring of the bearing 23) and is pressed in the shaft hole of the shell 10 in an interference fit manner. The accurate positioning of the driving gear 20 is finished by reducing the up-down movement of the driving gear shaft 8, the up-down movement of the driving gear shaft 8 is controlled by mainly relying on the thrust washer 22, the thrust washer 22 is clamped on the driving gear shaft 8, the upper surface position of the thrust washer 22 is limited by a limiting structure in the shaft hole of the actuator shell 10, and the lower surface position is limited by the upper end surface of the bearing 23/shaft sleeve 21 (the scheme in the drawing is the bearing 23), so that the up-down movement of the driving gear shaft 8 is small, and the position of the driving gear 20 is accurately controlled. The driving arm 9 is firstly pressed on the driving gear shaft 8, and then welded and fixed, preferably laser welding, with low welding temperature and small welding deformation, and has small thermal influence on peripheral parts. The intermediate gear shaft 13 and the drive gear shaft 8 are both made of metal materials.
The magnet 17 and the magnet seat 18 are integrally manufactured and formed through plastic coating, the magnet seat 18 is sleeved on the driving gear shaft 8 and fixed by the aid of the pins 19, the magnet 17 is made of magnetic permeability materials, and the magnet seat 18 and the pins 19 are generally formed through an injection molding process. Or the magnet 17 and the driving gear shaft 8 are manufactured by adopting an integrated forming process, so that the investment of a magnet seat 18 and a pin 19 is omitted. Magnet 17 is typically made of magnetically permeable material and magnet holder 18 and pin 19 are typically formed by an injection molding process.
According to the exhaust throttle valve of the diesel engine, under the high-load working condition, the diesel vehicle does not have the requirements of improving exhaust back pressure and exhaust temperature, and at the moment, the valve plate of the throttle valve body is in the full-open position, so that the power performance of the whole vehicle is not influenced. When a diesel vehicle is operated in an idle or low load condition, the exhaust temperature of the engine generally does not reach a target temperature value required for catalytic conversion of the aftertreatment unit. In such a case, the problems described in the background art may occur. Therefore, the application improves, when the diesel vehicle runs under idle speed or low load working condition, the valve plate opening command is calculated and sent to the throttle valve body (exhaust throttle valve) through the whole vehicle ECM, the motor is controlled to rotate, the motor rotates to drive the valve plate to rotate towards the direction of reducing the valve plate opening, the rotation angle torque is output after the gear set is used for reducing speed and increasing torque, then the valve shaft and the valve plate are driven to rotate through the connection of the driving arm and the driving turntable, the valve plate opening is reduced, the exhaust back pressure is increased, the diesel engine simultaneously keeps normal torque output through multiple oil injection, and the exhaust temperature of the engine is rapidly increased to reach the target temperature value required by post-treatment catalytic conversion, so that the pollutant emission is reduced, and the environmental protection regulation requirement is met. When the load of the whole vehicle rises, after the normal exhaust temperature is enough to maintain the high-efficiency catalytic conversion of the post-processing unit, the valve plate of the throttle valve body returns to the full-open position under the control of the ECM of the whole vehicle or under the action of the return spring, so that the power output of the whole vehicle is not influenced. According to the exhaust throttle valve of the diesel engine, when the diesel engine is in the working condition of low exhaust temperature such as idling and low load, the opening degree of the valve plate of the throttle valve can be accurately and timely reduced to improve exhaust back pressure, and the exhaust temperature is improved by combining with an oil injection strategy of the diesel engine, so that the catalytic conversion efficiency of a post-processing unit is improved, pollutant emission is reduced, and finally emission is ensured to meet the requirement of emission regulations.
While the application has been described above with reference to the accompanying drawings, it will be apparent that the specific implementation of the application is not limited by the foregoing, but rather is within the scope of the application as long as various modifications are made by the method concept and technical scheme of the application, or the concept and technical scheme of the application are directly applied to other occasions without modification.
Claims (8)
1. An exhaust throttle valve for a diesel engine, characterized by: the throttle body (1) of the exhaust throttle valve of the diesel engine comprises an actuator (2) and a butterfly valve (3), a motor (25) is arranged in a shell (10) of the actuator (2), a motor gear (29) of the motor (25) is meshed with a large gear of an intermediate gear (24), the large gear is meshed with a small gear of the intermediate gear (24), the small gear is meshed with a driving gear (20), the driving gear (20) is connected with a driving gear shaft (8), the driving gear shaft (8) is connected with a valve plate (33) of the butterfly valve (3) through a driving arm (9), a magnet (17) is arranged above the driving gear (20), the magnet (17) is arranged to be capable of feeding back an angle position signal of the driving gear shaft (8) to a Hall angle position sensor (15), the Hall angle position sensor (15) is connected with a whole vehicle ECM, and the whole vehicle ECM is arranged to be capable of sending a valve plate opening command to the throttle body (1) under idle or low-load working conditions, so that the motor (25) of the throttle body (1) is controlled to rotate, and the motor (25) drives the valve plate (33) to drive the valve plate (33) to rotate towards the valve plate (33) in a small opening direction;
when the motor (25) drives the valve plate (33) to rotate towards the opening reducing direction of the valve plate (33), the rotation angle of the motor (25) is reduced by the motor gear (29), the intermediate gear (24) and the gear set formed by the driving gear (20) to output rotation angle torque after the rotation is increased, then the valve shaft (34) is driven to drive the valve plate (33) to rotate through the transmission of the driving arm (9) and the driving turntable (30), when the valve plate (33) rotates towards the opening reducing direction of the valve plate (33), the opening of the valve plate (33) is reduced, the back pressure of exhaust gas is increased, at the moment, the diesel engine is increased to simultaneously increase the oil injection to keep the normal torque output of the diesel engine, and the exhaust temperature can be increased to reach the target temperature value required by post-treatment catalytic conversion;
the butterfly valve (3) is arranged to be capable of receiving corner torque input transmitted by a clamping groove of a driving arm (9) of the actuator (2) through a claw of the driving turntable (30), overcomes the screwing resistance of a return spring (31) and drives a valve shaft (34) and a valve plate (33) to rotate to a target angle position;
the return spring (31) maintains a certain pretightening force in a torsion direction after being installed, and the valve plate (33) is in a normally open position under the cooperation of the limiting structure of the butterfly valve shell (32) and the limiting structure of the driving turntable (30); under the control of the whole vehicle ECM or under the action of a return spring, the valve plate of the throttle valve body returns to the full-open position.
2. The diesel engine exhaust throttle valve of claim 1, wherein: the actuator (2) comprises a shell (10), a water inlet and outlet pipe (7), an outer cover (5), an outer cover sealing ring (28), a motor (25), a wave spring (26), a motor flange (27), a gear set, a shaft system consisting of a middle gear shaft (13) and a driving gear shaft (8), a driving arm (9), a magnet (17) and a PCB (printed circuit board) (14), wherein the PCB (14) comprises a Hall angle position sensor (15), an electronic component, a motor pin needle (12) and a pin needle (11), and a cooling water channel is arranged in the shell.
3. A diesel engine exhaust throttle valve according to claim 1 or 2, characterized in that: the diesel engine exhaust throttle valve also comprises a connecting part (4), wherein the connecting part (4) is arranged to be capable of connecting the structure of the actuator (2) and the butterfly valve (3), the connecting part (4) is simultaneously arranged to be capable of being in heat insulation and flexible connection, and the connecting part (4) comprises a bracket (40), a sleeve (42), a wire gasket (41), a bolt and nut fastener I (43) and a bolt and nut fastener II (44).
4. A diesel engine exhaust throttle valve according to claim 1 or 2, characterized in that: the outer cover (5) of the actuator (2) of the exhaust throttle valve of the diesel engine is fixedly connected with the shell (10) through a spring buckle or an outer cover screw (6), an outer cover sealing ring (28) is embedded in a groove on the outer cover (5), PPS or PBT is selected as a material of the outer cover (5), glass fibers are added, injection molding is adopted for the outer cover (5), and EPDM is selected as a material of the outer cover sealing ring (28).
5. The diesel engine exhaust throttle valve of claim 2, wherein: the motor (25) is a direct current brush motor or a brushless motor, a wave spring (26) is additionally arranged between the motor (25) and the shell (10), an inner hole of a motor flange (27) and the outer wall surface of a bearing chamber of the motor (25) are in interference press fit together, and then the motor flange is rigidly connected to the shell (10) through a fastener.
6. The diesel engine exhaust throttle valve of claim 5, wherein: the wave spring (26) is made of metal, the motor flange (27) is formed by plastic coating, a pin needle is embedded in the middle of the wave spring, and the pin needle is used for connecting a motor terminal and the motor pin needle (12).
7. The diesel engine exhaust throttle valve of claim 2, wherein: the motor (25) comprises a motor gear shaft, the motor gear shaft and the motor (25) are integrally manufactured, the intermediate gear shaft (13) is pressed on the actuator shell (10) in an interference mode, the driving gear (20) is assembled with the shell (10) through a bearing (23) and/or a shaft sleeve (21), the bearing (23) and/or the shaft sleeve (21) are subjected to sealing design, and the intermediate gear shaft is pressed in the shaft hole of the shell (10) in an interference mode.
8. A diesel engine exhaust throttle valve according to claim 1 or 2, characterized in that: the magnet (17) and the magnet seat (18) are integrally manufactured and formed through plastic coating, the magnet seat (18) is sleeved on the driving gear shaft (8) and fixed by virtue of the pin (19), the magnet (17) is manufactured by adopting a magnetic permeability material, and the magnet seat (18) and the pin (19) are generally formed by adopting an injection molding process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110709609.6A CN113606046B (en) | 2021-06-25 | 2021-06-25 | Exhaust throttle valve of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110709609.6A CN113606046B (en) | 2021-06-25 | 2021-06-25 | Exhaust throttle valve of diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113606046A CN113606046A (en) | 2021-11-05 |
| CN113606046B true CN113606046B (en) | 2023-09-29 |
Family
ID=78336821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110709609.6A Active CN113606046B (en) | 2021-06-25 | 2021-06-25 | Exhaust throttle valve of diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113606046B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320616A (en) * | 2021-12-28 | 2022-04-12 | 上海华培动力科技(集团)股份有限公司 | Device capable of adjusting air displacement and installation method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001304023A (en) * | 2000-04-21 | 2001-10-31 | Toyota Motor Corp | Control device for internal combustion engine |
| DE102004011709A1 (en) * | 2004-03-10 | 2005-09-29 | Adam Opel Ag | Control and operating system, for multicylinder direct injection stratified charge or lean mixture petrol engine for road vehicle, measures amount of fuel injected into each cylinder |
| CN202220663U (en) * | 2011-09-23 | 2012-05-16 | 日立汽车部件（苏州）有限公司 | Throttle valve device |
| CN208650994U (en) * | 2018-05-02 | 2019-03-26 | 东风康明斯发动机有限公司 | Combination type firewood oil turbine heat management system |
| CN111173621A (en) * | 2020-01-17 | 2020-05-19 | 杰锋汽车动力系统股份有限公司 | New energy automobile electron air throttle structure |
-
2021
- 2021-06-25 CN CN202110709609.6A patent/CN113606046B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001304023A (en) * | 2000-04-21 | 2001-10-31 | Toyota Motor Corp | Control device for internal combustion engine |
| DE102004011709A1 (en) * | 2004-03-10 | 2005-09-29 | Adam Opel Ag | Control and operating system, for multicylinder direct injection stratified charge or lean mixture petrol engine for road vehicle, measures amount of fuel injected into each cylinder |
| CN202220663U (en) * | 2011-09-23 | 2012-05-16 | 日立汽车部件（苏州）有限公司 | Throttle valve device |
| CN208650994U (en) * | 2018-05-02 | 2019-03-26 | 东风康明斯发动机有限公司 | Combination type firewood oil turbine heat management system |
| CN111173621A (en) * | 2020-01-17 | 2020-05-19 | 杰锋汽车动力系统股份有限公司 | New energy automobile electron air throttle structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113606046A (en) | 2021-11-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20070240677A1 (en) | Throttle control apparatus and method for throttle control | |
| JP4661668B2 (en) | Valve open / close control device | |
| KR100688399B1 (en) | Emission gas recycling equipment having butterfly valve | |
| US9404444B2 (en) | Exhaust system for internal combustion engine | |
| EP1420158B1 (en) | Exhaust gas recirculation device | |
| US7950623B2 (en) | Valve opening and closing control apparatus | |
| US20070240690A1 (en) | Fluid control valve | |
| US20110042599A1 (en) | Fluid control valve | |
| EP1930581B1 (en) | Valve controller of internal combustion engine | |
| JP2017008757A (en) | Electric actuator and method of manufacturing the same | |
| JP2011058536A (en) | Fluid control valve and manufacturing method thereof | |
| US20090164098A1 (en) | Controller for internal combustion engine | |
| US20090164097A1 (en) | Intake controller for internal combustion engine | |
| CN113606046B (en) | Exhaust throttle valve of diesel engine | |
| US20130047941A1 (en) | Control device for internal combustion engine | |
| US6446588B2 (en) | Internal combustion engine having electromagnetic valve driving mechanism and method of controlling electromagnetic valve driving mechanism | |
| EP1544438B1 (en) | Supporting device for actuator received in housing | |
| CN101446214B (en) | Continuously adjustable mechanical hydraulic valve lift device | |
| JP2008196437A (en) | Exhaust gas control valve | |
| JP2009243475A (en) | Fluid control valve | |
| JP2007303434A (en) | Exhaust gas control valve | |
| JP2010242972A (en) | Valve opening/closing control device | |
| JP2010084749A (en) | Exhaust gas recirculation device | |
| JP2010121569A (en) | Exhaust gas recirculation device | |
| CN109441673B (en) | Butterfly type EGR valve of torque motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |