CN105422323A - Leading-in device capable of realizing controllable cold and hot EGR (exhaust gas recirculation) - Google Patents
Leading-in device capable of realizing controllable cold and hot EGR (exhaust gas recirculation) Download PDFInfo
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- CN105422323A CN105422323A CN201510974006.3A CN201510974006A CN105422323A CN 105422323 A CN105422323 A CN 105422323A CN 201510974006 A CN201510974006 A CN 201510974006A CN 105422323 A CN105422323 A CN 105422323A
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Abstract
The invention discloses a leading-in device capable of realizing controllable cold and hot EGR (exhaust gas recirculation), aiming at overcoming the problem of the prior art that cold and hot EGR cannot be led into a cylinder in a controlled way. The device comprises an engine, a turbine, an EGR valve, a gas compressor, a cooler and a throttle valve; the EGR valve comprises a valve body; and connectors are arranged at the left wall, the front wall and the rear wall of the valve body, which are an outlet C, an inlet A and an outlet B in sequence. The gas inlet end of the turbine is connected with a pipe at a gas outlet end of an exhaust manifold in the engine, the gas inlet A of the EGR valve is connected with a pipe at an exhaust end of the engine, the gas outlet C of the EGR valve is connected with a pipe at a gas inlet end of the cooler, the gas outlet end of the gas compressor is connected with a pipe at a gas inlet of the cooler, the gas outlet of the cooler is connected with a pipe at one end of the throttle valve, the other end of the throttle valve is connected with a pipe at the gas inlet end of a gas inlet manifold in the engine, the gas outlet B of the EGR valve is connected with a pipe at the gas inlet end of the at inlet manifold, and the turbine is connected with the gas compressor by a rotor.
Description
Technical field
The present invention relates to a kind of EGR leading device on motor, or rather, the present invention relates to one and realize the controlled leading device of hot and cold EGR.
Background technique
Along with the increasingly stringent of Abgasgesetz, the control for emissions from engines NOx emission is especially strict, and at present, EGR technology is the mainstream technology controlling NOx emission.
EGR and gas recirculation system, refer to and a part for the exhaust of motor introduced in cylinder again, affect burning by waste gas, thus reach the effect reducing NOx.Its working mechanism is as follows:
1. contain a large amount of N in waste gas
2and CO
2deng inert gas, oxygen concentration in cylinder can be reduced, the generation of restriction NOx;
2. cycle gas dilutes ozone, slow down combustion rate, can reduce maximum combustion temperature and maximum combustion pressure;
3. H in waste gas
2o (steam) and CO
2gas etc. are three atomic gas, make gas in the jar specific heat capacity become large, reduce maximum combustion temperature in cylinder.
EGR is divided into again cold EGR and hot EGR, and wherein, cold EGR refers to that cycle gas is introduced into intake manifold again after supercooler; Hot EGR refers to that cycle gas directly enters intake manifold without cooler.Cold EGR gas temperature hotter EGR gas temperature after supercooler is relatively low, and density is large, and more waste gas can be made to enter cylinder.During large load, in cylinder, mixed gas is dense, and combustion temperature is high, and needing to introduce cold EGR: one is that cold EGR gas temperature is low, can absorb more heat and reduce cylinder temperature, thus reduce the generation of NOx; Two is to enter more EGR gas, reduces oxygen content in cylinder, thus reduces the generation of NOx.But when engine cold-start, hot EGR can warming-up rapidly; When Smaller load, in cylinder, mixed gas is rare, if introduce cold EGR again, can cause engine misses, and therefore needing to introduce hot EGR: one is that hot EGR can make intake temperature increase, and is conducive to mixed gas and catches fire, and promotes burning, improves engine performance; Two is that in EGR, high heat capacity component can reduce in-cylinder combustion temperature, suppresses the generation of NOx.
Chinese patent open (cloth) number is CN101103195A, open (cloth) day is on January 9th, 2008, denomination of invention is " EGR device ", the patent No. is 200580046815.2, this patent of invention discloses a kind of EGR device, it is characterized in that the temperature being carried out control EGR by controlled circulation waste gas through the number (>=2) of cooler for recycled exhaust gas, to prevent in cooled EGR the condensation of HC chemical composition or solidify, become liquid or solid and be attached in EGR valve.This invention had both improve the cooling degree of EGR gas, and the work that EGR valve can not occur again is bad.But in this contrive equipment, cooler quantity is many (>=3), makes manufacture cost increase, and it is comparatively large that this device is taken up space, and installs difficulty on the engine.And the controlled introducing motor of hot and cold EGR can not be realized.
Summary of the invention
Technical problem to be solved by this invention overcomes prior art to there is the problem that can not realize the controlled introducing cylinder of hot and cold EGR, provides one and realize the controlled leading device of hot and cold EGR.
For solving the problems of the technologies described above, the present invention adopts following technological scheme to realize:
Described one realizes the controlled leading device of hot and cold EGR and comprises motor, turbo machine, EGR valve, gas compressor, cooler and closure.
The inlet end of turbo machine is connected with engine pipelines, the suction port A of EGR valve is connected with engine exhaust end pipeline, the air outlet C of EGR valve is connected with the air outlet end pipeline of gas compressor, the air outlet end of gas compressor is connected with the suction port end pipeline of cooler, the air outlet end of cooler is connected with one end pipeline of closure, the other end of closure is connected with the inlet end pipeline in motor, the air outlet B of EGR valve is connected with the suction port end pipeline of intake manifold, and turbo machine is connected by rotor with gas compressor.
The suction port end of the turbo machine described in technological scheme is connected with engine pipelines, the suction port A of EGR valve is connected with engine exhaust end pipeline and refers to: the suction port end of turbo machine is connected with one end of outlet pipe, the other end of outlet pipe is connected with the air outlet end of the gas exhaust manifold in motor, one end of EGR pipe is connected with the air outlet end of gas exhaust manifold, and the other end of EGR pipe is connected with the suction port A of EGR valve.
The air outlet C of the EGR valve described in technological scheme is connected with the air outlet end pipeline of gas compressor, and the air outlet end of gas compressor is connected with the suction port end pipeline of cooler, and the air outlet B of EGR valve is connected with the suction port end pipeline of intake manifold and refers to:
The air outlet C of EGR valve is connected with one end of cold EGR pipe, and the other end of EGR pipe is connected with the suction port end of cooler, and the air outlet end of gas compressor is connected with one end of suction tude, and the suction port end of cooler is connected with the other end of suction tude; The air outlet B of EGR valve is connected with one end of hot EGR pipe, and the other end of hot EGR pipe is connected with the suction port end of intake manifold.
EGR valve described in technological scheme is an electric T-shaped valve, comprises motor, spool, valve rod, valve gap, sealing gasket, valve body and position transducer.Spool and valve rod are all cylindrical structural part, and spool and valve rod are connected for ladder shaft type structural member coaxially, the equal diameters of the diameter of spool and the vertical center valve opening of valve body, the equal diameters of the center hole on the diameter of valve rod and valve gap; Spool loads in valve body for being rotationally connected, valve gap, sealing gasket from top to bottom are sleeved on valve rod, for being rotationally connected between valve gap and valve rod, bolt is adopted valve gap, sealing gasket to be fixed on the top of valve body, motor is coaxially connected with valve rod, position transducer is arranged on valve body, and the mobile terminal of position transducer is fixedly connected with valve rod.
Valve body described in technological scheme is the housing member of hollow cuboid shape, valve body center is provided with the vertical center valve opening installing spool, the left wall of valve body, antetheca and right wall are respectively arranged with cirque body formula interface, namely be outlet C, import A and outlet B successively, the center hole of three interfaces is communicated with vertical center valve opening, the rotational axis of the center hole of three interfaces is in together in a horizontal plane, outlet C and the rotational axis conllinear exporting B, the rotational axis of import A is vertical with the rotational axis of outlet B with outlet C.
Compared with prior art the invention has the beneficial effects as follows:
1. of the present inventionly a kind ofly realize the controlled introducing that the controlled leading device of hot and cold EGR achieves hot and cold EGR;
2. a kind of hot and cold EGR passage realized in the controlled leading device of hot and cold EGR of the present invention shares an EGR valve, saves manufacture cost;
3. of the present inventionly a kind ofly realize the cooling system of EGR in the controlled leading device of hot and cold EGR and the cooling system of air inlet uses a cooler jointly, provide cost savings, save space, be convenient to be arranged on vehicular engine.
Accompanying drawing explanation
Fig. 1 is a kind of structural principle schematic diagram realizing the controlled leading device of hot and cold EGR of the present invention;
Fig. 2 is the whole-cutaway view on a kind of EGR valve structure composition plan view realizing adopting in the controlled leading device of hot and cold EGR of the present invention;
Fig. 3 is a kind of whole-cutaway view of EGR valve when not adopting EGR gas on plan view realizing adopting in the controlled leading device of hot and cold EGR of the present invention;
Fig. 4 is a kind of structural principle schematic diagram realizing cold EGR passage part in the controlled leading device of hot and cold EGR of the present invention;
Fig. 5 is a kind of whole-cutaway view of EGR valve on plan view when realizing adopting cold EGR in the controlled leading device of hot and cold EGR of the present invention;
Fig. 6 is a kind of structural principle schematic diagram realized when the controlled leading device of hot and cold EGR adopts hot EGR described in invention;
Fig. 7 be of the present invention a kind of to realize in the controlled leading device of hot and cold EGR whole-cutaway view when adopting hot EGR on EGR valve plan view;
In figure: 1. cylinder, 2. motor, 3. gas exhaust manifold, 4. outlet pipe, 5. turbo machine, 6.EGR manages, 7.EGR valve, 8. hot EGR pipe, 9. cold EGR pipe, 10. gas compressor, 11. suction tude, 12. coolers, 13. closures, 14. intake manifold, 15. spools, 16. valve rods, 17. valve gaps, 18. sealing gaskets, 19. valve bodies.
Embodiment
Below in conjunction with accompanying drawing, the present invention is explained in detail:
Consult Fig. 1, one of the present invention realizes the controlled leading device of hot and cold EGR and comprises motor 2, turbo machine 5, EGR valve 7, gas compressor 10, cooler 12, closure 13 and pipeline.Described pipeline comprises outlet pipe 4, EGR pipe 6, hot EGR pipe 8, cold EGR pipe 9 and suction tude 11; Motor 2 comprises cylinder 1, gas exhaust manifold 3 and intake manifold 14.
Consult Fig. 2 and Fig. 3, described EGR valve 7 is electric T-shaped valves, comprises motor, spool 15, valve rod 16, valve gap 17, sealing gasket 18, valve body 19 and position transducer;
Described valve body 19 is the housing member of hollow cuboid shape, valve body 19 center is provided with the vertical center valve opening installing spool 15, the left wall of valve body 19, antetheca and right wall are respectively arranged with cirque body formula interface, namely be air outlet C, suction port A and air outlet B successively, the center hole of three interfaces is communicated with vertical center valve opening, the rotational axis of the center hole of three interfaces is in together in a horizontal plane, the rotational axis conllinear of air outlet C and air outlet B, the rotational axis of suction port A is vertical with the rotational axis of air outlet B with air outlet C.
Spool 15 and valve rod 16 are all cylindrical structural part, spool 15 and valve rod 16 are connected for ladder shaft type structural member (also can be made of one part) coaxially, the equal diameters of the diameter of spool 15 and the vertical center valve opening of valve body 19, the equal diameters of the center hole on the diameter of valve rod 16 and valve gap 17;
Spool 15 loads in valve body 19 for being rotationally connected, valve gap 17, sealing gasket 18 are sleeved on valve rod 16 from top to bottom, for being rotationally connected between valve gap 17 and valve rod 16, valve gap 17, sealing gasket 18 and valve body 19 are followed successively by contact and connect, and adopt bolt valve gap 17, sealing gasket 18 to be fixed on the top of valve body 19; Be connected for coaxial between motor with valve rod 16, position transducer is arranged on valve body 19, and the mobile terminal of position transducer is fixedly connected with valve rod 16.
The air outlet B of described EGR valve 7 is connected with hot EGR pipe 8; Air outlet C is connected with cold EGR pipe 9.Motor-driven valve bar 16 rotational valve core 15 adjusts the flow direction of EGR gas and the aperture of valve, the position transducer that EGR valve 7 configures, and can feed back and carry out flow control.Fig. 2 and Fig. 3 is the state of the EGR valve 7 when not introducing EGR gas, and two outlets are all blocked by spool, EGR gas not by.
The suction port end of turbo machine 5 is connected with one end of outlet pipe 4, the other end of outlet pipe 4 is connected with the air outlet end of the gas exhaust manifold 3 in motor 2, one end of EGR pipe 6 is connected with the middle of outlet pipe 4, the other end of EGR pipe 6 is connected with the suction port A of EGR valve 7, the air outlet C of EGR valve 7 is connected with one end of cold EGR pipe 9, the other end of EGR pipe 9 is connected with the middle of suction tude 11, one end of suction tude 11 is connected with the air outlet end of gas compressor 10, the other end of suction tude 11 is connected with the suction port end of cooler 12, the air outlet end of cooler 12 is connected with one end of closure 13, the other end of closure 13 is connected with the suction port end of the intake manifold 14 in motor 2, the air outlet B of EGR valve 7 is connected with one end of hot EGR pipe 8, the other end of hot EGR pipe 8 is connected with the inlet end of the intake manifold 14 in motor 2, turbo machine 5 is connected by rotor with gas compressor 10, the air outlet of turbo machine 5 is connected with three-way catalytic converter, the suction port of gas compressor 10 is connected with air-strainer.
Consult Fig. 4 and Fig. 5, principle schematic when Fig. 4 represents that cold EGR introduced by motor.During the large load of motor, in cylinder, mixed gas is dense, and combustion temperature is high, and NOx emission is high, needs to introduce more EGR gas, therefore needs to introduce cold EGR.Part waste gas is introduced in EGR pipe 6 from outlet pipe 4, and motor-driven valve bar 16 rotational valve core 15, makes EGR pipe 6, EGR valve 7 be communicated with (Fig. 5) with cold EGR pipe 9, be namely communicated with cold EGR passage, realizes supplying cold EGR gas to motor.And regulating EGR gas flow by the corner of regulating spool 15, waste gas is introduced in the suction port end of cooler 12, together with air after supercooler 12 cools, enters intake manifold 14.Cooled EGR gas temperature is low, and density is large, and the exhausted air quantity entering cylinder is large, can reduce the amount of oxygen that in-cylinder combustion temperature and minimizing enter cylinder significantly, effectively suppress the generation of NOx, reduce the discharge of NOx.
Consult Fig. 6 and Fig. 7, principle schematic when Fig. 6 represents that hot EGR introduced by motor.During small engine load, in cylinder, mixed gas is rare, introduces hot EGR, can increase intake temperature, promotes mixture combustion.And the high heat capacity component in EGR can reduce combustion temperature, suppress the generation of NOx.Part waste gas is introduced in EGR pipe 6 from outlet pipe 4, and motor-driven valve bar 16 rotational valve core 15, makes EGR pipe 6, EGR valve 7 be communicated with (Fig. 7) with hot EGR pipe 8, be namely communicated with hot EGR passage, realizes supplying hot EGR gas to motor.And regulating EGR gas flow by the corner of regulating spool 15, waste gas is introduced to the suction port end of intake manifold 14, enters intake manifold 14 together with cooled air inlet.Now, intake temperature is higher.
Claims (5)
1. one kind realizes the controlled leading device of hot and cold EGR, it is characterized in that, described one realizes the controlled leading device of hot and cold EGR and comprises motor (2), turbo machine (5), EGR valve (7), gas compressor (10), cooler (12) and closure (13);
The suction port end of turbo machine (5) is connected with motor (2) pipeline, the suction port A of EGR valve (7) is connected with the exhaust end pipeline of motor (2), the air outlet C of EGR valve (7) is connected with the air outlet end pipeline of gas compressor (10), the air outlet end of gas compressor (10) is connected with the suction port end pipeline of cooler (12), the air outlet end of cooler (12) is connected with one end pipeline of closure (13), the other end of closure (13) is connected with the inlet end pipeline of motor (2), the air outlet B of EGR valve (7) is connected with the suction port end pipeline of intake manifold (14), turbo machine (5) is connected by rotor with gas compressor (10).
2. realize the controlled leading device of hot and cold EGR according to one according to claim 1, it is characterized in that, the suction port end of described turbo machine (5) is connected with motor (2) pipeline, and the suction port A of EGR valve (7) is connected with the exhaust end pipeline of motor (2) and refers to:
The suction port end of turbo machine (5) is connected with one end of outlet pipe (4), the other end of outlet pipe (4) is connected with the air outlet end of the gas exhaust manifold (3) in motor (2), one end of EGR pipe (6) is connected with the air outlet end of gas exhaust manifold (3), and the other end of EGR pipe (6) is connected with the suction port A of EGR valve (7).
3. realize the controlled leading device of hot and cold EGR according to one according to claim 1, it is characterized in that, the air outlet C of described EGR valve (7) is connected with the air outlet end pipeline of gas compressor (10), the air outlet end of gas compressor (10) is connected with the suction port end pipeline of cooler (12), and the air outlet B of EGR valve (7) is connected with the suction port end pipeline of intake manifold (14) and refers to:
The air outlet C of EGR valve (7) is connected with one end of cold EGR pipe (9), the other end of EGR pipe (9) is connected with the suction port end of cooler (12), the air outlet end of gas compressor (10) is connected with one end of suction tude (11), and the suction port end of cooler (12) is connected with the other end of suction tude (11); The air outlet B of EGR valve (7) is connected with one end of hot EGR pipe (8), and the other end of hot EGR pipe (8) is connected with the suction port end of intake manifold (14).
4. realize the controlled leading device of hot and cold EGR according to one according to claim 1, it is characterized in that, described EGR valve (7) is an electric T-shaped valve, comprises motor, spool (15), valve rod (16), valve gap (17), sealing gasket (18), valve body (19) and position transducer;
Spool (15) and valve rod (16) are all cylindrical structural part, spool (15) and valve rod (16) are connected for ladder shaft type structural member coaxially, the equal diameters of the diameter of spool (15) and the vertical center valve opening of valve body (19), the equal diameters of the center hole on the diameter of valve rod (16) and valve gap (17);
Spool (15) loads in valve body (19) for being rotationally connected, valve gap (17), sealing gasket (18) are sleeved on valve rod (16) from top to bottom, for being rotationally connected between valve gap (17) and valve rod (16), bolt is adopted valve gap (17), sealing gasket (18) to be fixed on the top of valve body (19), motor is coaxially connected with valve rod, position transducer is arranged on valve body (19), and the mobile terminal of position transducer is fixedly connected with valve rod (16).
5. realize cold according to one according to claim 4, the controlled leading device of hot EGR, it is characterized in that, the housing member that described valve body (19) is hollow cuboid shape, valve body (19) center is provided with the vertical center valve opening installing spool (15), the left wall of valve body (19), antetheca and right wall are respectively arranged with cirque body formula interface, namely be outlet C successively, import A and outlet B, the center hole of three interfaces is communicated with vertical center valve opening, the rotational axis of the center hole of three interfaces is in together in a horizontal plane, outlet C and the rotational axis conllinear exporting B, the rotational axis of import A is vertical with the rotational axis of outlet B with outlet C.
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Cited By (4)
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| CN107740739A (en) * | 2017-11-13 | 2018-02-27 | 武汉理工大学 | Variable cooling EGR gas handling systems and the waste gas processing method based on it |
| CN108287083A (en) * | 2018-04-17 | 2018-07-17 | 安徽中家智锐科技有限公司 | A kind of accurate temperature control water end system of washing machine performance test station |
| CN108691700A (en) * | 2017-03-29 | 2018-10-23 | 罗伯特·博世有限公司 | Internal combustion engine and method for running internal combustion engine |
| CN110594051A (en) * | 2019-07-29 | 2019-12-20 | 东风商用车有限公司 | Controllable cold and hot EGR system |
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