CN101397955A

CN101397955A - Exhaust gas recirculation device

Info

Publication number: CN101397955A
Application number: CNA2008101618006A
Authority: CN
Inventors: 塙薰; 菊池一纪
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2007-09-28
Filing date: 2008-09-26
Publication date: 2009-04-01
Anticipated expiration: 2028-09-26
Also published as: BRPI0803571B1; TW200914719A; TWI342920B; KR101012446B1; KR20090032945A; BRPI0803571A2; CN101397955B; JP4925991B2; JP2009085107A

Abstract

The present invention provides an EGR device which can increase the combustion velocity and can restrain the knocking generation. An EGR cam (80) forming the EGR device (10) is set on a cam shaft (38). The EGR cam can independently execute rotation relatively to the cam shaft, and a first injection (90) is projected from one bottom surface. The cam shaft is provided with a force application convex part (112) which comprises the following components: an inner ring component (102) which is projected with a second projection (12) and rotates along with the cam shaft, and an inner ring component (104) which is connected with a lever (130) of electromagnetic component (128) through a first paw (114) and a second paw (116), wherein the inner ring component rotates along with the cam shaft. When the inner ring component rotates under a state that the first projection abuts against the second projection, the EGR cam is transferred with rotation action force thereby the EGR cam rotates. Thus the EGR valve (72) is opened or closed.

Description

Exhaust gas recirculation device

Technical field

The present invention relates to the EGR device that internal-combustion engine is set up.

Background technique

Existing know set up the internal-combustion engine that a part that makes waste gas turns back to exhaust gas recirculation (EGR) device of firing chamber.For example patent documentation 1 discloses simple in structure and the pressure and temperature in the firing chamber is risen, and improves the internal-combustion engine of EGR effect thus.

The internal-combustion engine of this patent documentation 1 record carries out pressure accumulation to the waste gas via the relief opening exhaust in the gas storage chamber, makes described waste gas return the firing chamber when compression stroke etc.Promptly the EGR valve of EGR mouth configuration is opened, consequently be connected and gas storage chamber waste gas quilt is imported to the firing chamber along with gas storage chamber and firing chamber in compression stroke etc.Burned to the waste gas that the firing chamber imports with the mixed gas of air and fuel.

The internal-combustion engine that waste gas is burnt is again compared with the internal-combustion engine that does not possess the EGR device, the few advantage of NOx amount that has in the waste gas to be comprised.

Patent documentation 1:(Japan) spy opens the 2000-282867 communique

But above-mentioned this internal-combustion engine is ideal obvious hour of the load of this internal-combustion engine (for example unloaded time) even return the also not slack-off structure of combustion chambers burn speed with waste gas.Even preferably air is imported to the firing chamber with maximum flow, also can suppress to occur the structure of pinking.

Summary of the invention

The object of the present invention is to provide a kind of EGR device that can solve above-mentioned problem.

In order to reach described purpose, EGR device of the present invention is attached to internal-combustion engine, this internal-combustion engine possesses: be arranged at the intakeport that air is imported to the firing chamber Aspirating valves, be arranged at the outlet valve that carries out the relief opening of exhaust at the waste gas of described combustion chambers burn, wherein, have:

The gas storage chamber, it stores described waste gas;

The EGR valve, it is arranged on and is used to EGR mouth that described waste gas is returned to described firing chamber from described gas storage chamber;

Control mechanism, it judges the load state of described internal-combustion engine;

EGR valve open and close controlling mechanism, the some of surface state set down in its instruction according to the described control mechanism of judging described load state: the state that described gas storage chamber and described firing chamber is communicated with continuously or interdicts that makes that described EGR valve can open and close continuously or described EGR valve cuts out the state that described gas storage chamber and described firing chamber are interdicted of keeping.

Promptly according to the present invention, according to the load state of internal-combustion engine select the EGR valve can open and-shut mode or keep the some of closed condition (halted state).Be in can open and-shut mode the time, then waste gas is imported to the firing chamber and for burning again when the EGR valve is opened.On the other hand, when being in halted state, waste gas can not imported to the firing chamber.Therefore, for example obvious hour of the load of this internal-combustion engine or when obviously big, owing to, then at this moment can not import waste gas to the firing chamber, so can avoid velocity of combustion slack-off as long as the EGR valve is set for halted state.And can expect to suppress to occur pinking.

Because what only be provided with that EGR valve open and close controlling mechanism just can change the EGR valve can open and-shut mode and halted state, so structure can not complicate yet.Therefore can also suppress cost rises.

At this, can enumerate such structure as an example of EGR valve open and close controlling mechanism, this structure has:

The EGR cam, itself and the camshaft butt that described Aspirating valves and described outlet valve are opened and closed;

Force application mechanism, it possesses: be embedded in described camshaft place and with this integrated camshaft spinning movement and be provided with and can be carried out the rotary part of the abutting part of butt, not be rotated the non-rotating portion of action by abutting part with described EGR cam can be with displacement outward;

Displacement mechanism, it makes the axial direction displacement of described force application mechanism along described camshaft, makes described by abutting part and described abutting part butt or leave.

At this moment, do not need to dispose in the inside of camshaft be used to make the EGR valve from can open and-shut mode to the bar of halted state or opposite change etc.Therefore avoid the footpath of camshaft to become big, the result can avoid the volume and weight of EGR device and internal-combustion engine to become big.

Example as described displacement mechanism can be enumerated such structure, and this structure has: handle sturcture, and it controls the non-rotating portion that possesses described force application mechanism; Driver, it makes the axial direction displacement of described handle sturcture along described camshaft.

According to the present invention, be provided with EGR valve open and close controlling mechanism, and according to following EGR valve of the effect that loads on this EGR valve open and close controlling mechanism of internal-combustion engine from can open and-shut mode to halted state or change on the contrary.Therefore, can also make the EGR valve become halted state and waste gas is returned to the firing chamber according to load state.

Therefore, obvious hour of the load of internal-combustion engine or when obviously big, by the EGR valve is set for halted state, just can expect to improve velocity of combustion, and can suppress to occur pinking.

Description of drawings

Fig. 1 is a summary longitudinal section of setting up the internal-combustion engine major component of present embodiment EGR device;

Fig. 2 is that the II-II alignment of Fig. 1 is looked sectional view;

Fig. 3 is that the III-III alignment of Fig. 1 is looked sectional view;

Fig. 4 is the EGR cam of the EGR device of expression pie graph 1, the summary exploded perspective structural drawing that the application of force is used assembly body, first pawl and second pawl;

Fig. 5 is the summary longitudinal section of the major component when the EGR valve is in halted state in the internal-combustion engine of Fig. 1.

Symbol description

10 EGR devices, 12 internal-combustion engines, 14 cylinders, 18 cylinder heads, 22 pistons

24 firing chambers, 26 intakepories, 28 relief openings, 30 Aspirating valvess, 32 outlet valves

34,36,98 rocking arms, 38 camshafts, 40,42

cam

40a, 42a bump

64 cam sprocket wheels, 66 cam chains, 68 EGR mouths gas storage chambers 70

72 EGR valves, 80 EGR cams, 82 application of

forces assembly body

86,88 cam part

90 first protuberances, 92 locating studs, 102 inner loop components, 104 outer coil components

106 bearings, 108,110 tooth portions, 112 second protuberances, 114,116 pawls

128 electromagnetic elements, 130 bars 132 end axle 134 cables

Embodiment

Below about EGR device of the present invention, to enumerate preferred embodiment with the relation of the internal-combustion engine of setting up it and to describe in detail with reference to accompanying drawing.

Fig. 1 is a summary longitudinal section of setting up internal-combustion engine 12 major components of present embodiment EGR device 10, and Fig. 2 and Fig. 3 are respectively that the III-III alignment that the II-II alignment of Fig. 1 is looked sectional view, Fig. 1 is looked sectional view.This internal-combustion engine 12 for example is installed on the vehicles such as automobile two-wheel vehicle, and the mixed gas of combustion air and fuel makes this vehicle to run.

Internal-combustion engine 12 has: the cylinder body body 16 that cylinder 14 is provided with, the cylinder head 18 that links with the top of this cylinder body body 16, the skull 20 that covers and protect these cylinder head 18 tops.

Piston 22 inserts cylinders 14, and this piston 22 links with bent axle (all not shown) via connecting rod.Utilization is formed firing chamber 24 by the space of the upper-end surface of this piston 22 and cylinder head 18 coverings.

As shown in Figure 2, be formed with in the inside of cylinder head 18: with the intakeport 26 that is used for the induction mnifold (not shown) that air imports to firing chamber 24 is communicated with, 24 waste gas that burnt carry out the relief opening 28 that the gas exhaust manifold (not shown) of exhaust is communicated with in the firing chamber with being used for handle.At intakeport 26 Aspirating valves 30 is set on the one hand, at relief opening 28 outlet valve 32 is set on the other hand.

These Aspirating valvess 30 and outlet valve 32 open and close under the effect of camshaft 38 via rocking arm 34,36.Be that camshaft 38 is provided with

cam

40,42, bump 40a, the 42a that follows each

cam

40,42 of spinning movement of camshaft 38 then pushes any end of described rocking

arm

34,36 when arriving assigned position, any of this

rocking arm

34,36 then with its roughly midriff be that rotational action is carried out at the center.Consequently any of the pressing component 44,46 that is provided with along with the other end of this rocking

arm

34,36 push Aspirating valves 30 or outlet valve 32 and this Aspirating valves 30 or outlet valve 32 to firing chamber 24 side displacements.

Dispose valve spring

48,50 around Aspirating valves 30, the disk component 52 that an end of these

valve springs

48,50 is fixed on to being positioned in the cylinder head 18 is in place, and the other end to by outside to be embedded in the spring bearing part 54 of Aspirating valves 30 front ends in place.Along with camshaft 38 is rotated action and the bump 40a of cam 40 leaves from an end of described rocking arm 34,

valve spring

48,50 utilizes its elastic reaction and by pressing spring bearing part 54.Aspirating valves 30 returns to original position thus, and final result is in place to intakeport 26.

Outlet valve 32 disposes

valve spring

56,58 around it too, and an end of these

valve springs

56,58 is in place to disk component 60, and the other end to by outside to be embedded in the spring bearing part 62 of outlet valve 32 front ends in place.When camshaft 38 be rotated the action and the bump 42a of cam 42 leaves from an end of described rocking arm 36, thereupon, under

valve spring

56,58 elastic reactions and spring bearing part 62 is pressed, consequently outlet valve 32 returns to original position and is in place to relief opening 28.

At this, an end of camshaft 38 has cam sprocket wheel 64 to link (with reference to Fig. 1).Camshaft 38 is wound onto cam chain 66 drivings on this cam sprocket wheel 64 and is rotated action.

EGR mouth 68 (with reference to Fig. 3) is formed on the right side of intakeport 26, and this EGR mouth 68 is communicated with the gas storage chamber 70 of storing waste gas.EGR valve 72 is in place or leave on this EGR mouth 68.

Aspirating valves 30 and outlet valve 32 similarly also are provided with valve spring 74 (with reference to Fig. 3) around EGR valve 72.The disk component 76 that one end of this valve spring 74 is fixed on to being positioned in the cylinder head 18 is in place, and the other end to by outside to be embedded in the spring bearing part 78 of EGR valve 72 front ends in place.

At this as shown in figures 1 and 3, described camshaft 38 also is provided with the EGR cam 80 that is used to make 72 switchings of EGR valve.Camshaft 38 spinning movement independently relatively of this EGR cam 80.Be that turning effort power is not transmitted to EGR cam 80 from camshaft 38, and be that the application of force is transmitted with assembly body 82 only as described later from force application mechanism.

As shown in Figure 4, EGR cam 80 presents roughly toroidal, and its inner circle wall portion is formed with along the annular slot 84 of the circumferencial direction of this inner circle wall portion.Periphery wall portion is formed with first cam part 86 with bloating, forms second cam part 88 that roughly bloats equally with this first cam part 86 in the position of leaving predetermined angular from this first cam part 86 (for example by 180 ° of crankshaft angles).And be provided with highlightedly from the one bottom surface as by first protuberance 90 of abutting part, this first protuberance 90 is between first cam part 86 and second cam part 88.

On the other hand, camshaft 38 is provided with locating stud 92, and this locating stud 92 enters the described annular slot 84 (with reference to Fig. 1) that EGR cam 80 inner circle wall portions are provided with.Thus, EGR cam 80 is prevented from along the displacement of camshaft 38 axial directions.

The end butt that rocking arm 98 is also arranged on the EGR cam 80.And the other end of this rocking arm 98 also is provided with pressing component 100, the upper end portion butt of this pressing component 100 and EGR valve 72.

Camshaft 38 also is provided with described application of force assembly body 82.This application of force has the inner loop component 102 and the outer coil component 104 of disk shape with assembly body 82, these inner loop components 102 and outside be equipped with bearing 106 (with reference to Fig. 1) between the coil component 104.

The inner circle wall portion of inner loop component 102 is formed with tooth portion 108 (with reference to Fig. 1, Fig. 3 and Fig. 4), tooth portion 110 engagements that form on this tooth portion 108 and the camshaft 38 ends periphery wall nearby.Therefore, inner loop component 102 is rotated action with camshaft 38 with being integral along with the spinning movement of camshaft 38.Promptly this inner loop component 102 is rotary parts.

The bottom surface that faces EGR cam 80 sides in this inner loop component 102 is formed with second protuberance 112 (with reference to Fig. 1 and Fig. 4) as abutting part highlightedly.As described later, pushed by this second protuberance 112 with described first protuberance 90 of these second protuberance, 112 butts and make EGR cam 80 be rotated action.

On the other hand since inner loop component 102 and outside bearing 106 (with reference to Fig. 1) is installed as mentioned above between the coil component 104, so outer coil component 104 is not followed inner loop component 102 and is rotated action.In other words, outer coil component 104 is non-rotary parts.

As shown in Figure 4, outer coil component 104 its periphery walls first pawl 114 and second pawl 116 of being used as handle sturcture controlled.These first pawls 114 and second pawl 116 have the curved part 118,118 that leaves such bending mutually, and these curved parts 118,118 are accommodated application of force assembly body 82 each other.Each curved part 118,118 is respectively arranged with screwing through hole, and the screw 120,120 and the outer coil component 104 that have passed through these screwing through hole screw, so outer coil component 104 is linked with first pawl 114 and second pawl 116.

The axial direction of each line part 122,122 of these first pawls 114 and second pawl 116 by pivot 124 be midriff roughly.As shown in Figure 2, this pivot 124 is supported in the cylinder head 18.

The square front end 126,126 of each of first pawl 114 and second pawl 116 is formed with the notch part of U word shape respectively, each notch part by handlebar constitute bar 130 as the electromagnetic element (ソレノイ De) 128 of driver block end end axle 132.Utilize these first pawls 114, second pawl 116 (handle sturcture) and electromagnetic element 128 to be configured for making the application of force displacement mechanism of assembly body 82 along the axial direction displacement of camshaft 38.

As described later, with under the effect of assembly body 82, can set EGR valve 72 for can open and-shut mode or any of halted state in this displacement mechanism, EGR cam 80 (with reference to Fig. 1, Fig. 3 and Fig. 4) and the application of force.It is these displacement mechanisms, EGR cam 80 and the application of force have EGR valve open and close controlling mechanism with assembly body 82 function.

Described electromagnetic element 128 via the cable 134 that is used for transfer control signal with not shown control mechanism for example CPU be electrically connected.This CPU and then also be electrically connected with the engine load sensor of the inner detection air throttle aperture that is provided with of not shown described induction mnifold and the turn-sensitive device etc. that detects internal-combustion engine 12 rotating speeds.

The internal-combustion engine 12 of having set up present embodiment EGR device 10 is above structure basically, the following describes its action effect.

When internal-combustion engine 12 by the application of force, in next camshaft 38 spinning movements of the effect of cam chain 66 and cam sprocket wheel 64.Then

cam

40,42 is rotated action thereupon, and when the bump 42a of its cam 42 arrival assigned position, then pressure exhaust valve 32 is pressed via pressing component 46 in the end of rocking arm 36.Thus, when

valve spring

56,58 shrinks and outlet valve 32 leaves from relief opening 28.Be that relief opening 28 is communicated with firing chamber 24, thereupon, the waste gas of burning is stored in the gas storage chamber 70.

When camshaft 38 is proceeded spinning movement and the bump 42a of cam 42 leaves from the end of rocking arm 36, under the elastic reaction of the

valve spring

56,58 of elongation, outlet valve 32 turns back to original position, and is in place to relief opening 28.Be that relief opening 28 is interdicted with firing chamber 24.

On the other hand, the bump 40a of cam 40 becomes the position of pushing rocking arm 34 ends, thus, and when

valve spring

48,50 shrinks and Aspirating valves 30 leaves from intakeport 26.In other words, intakeport 26 is communicated with firing chamber 24, and air is imported to firing chamber 24 via intakeport 26.

Certainly, when camshaft 38 is proceeded spinning movement and the bump 40a of cam 40 leaves from the end of rocking arm 34, then

valve spring

48,50 elongations and Aspirating valves 30 applied elastic force.Consequently Aspirating valves 30 turns back to original position and in place to intakeport 26, so that intakeport 26 is interdicted with firing chamber 24.

During this period, the application of force of tooth portion 110 engagements of tooth portion 108 and camshaft 38 also is rotated action with camshaft 38 servo-actuateds with the inner loop component 102 of assembly body 82.

In the middle of this process, when described CPU basis judged that from the telecommunications breath of engine load sensor and turn-sensitive device etc. the load of internal-combustion engine 12 is in intermediate speed region to the part area, this CPU sent instruction to described electromagnetic element 128, becomes state shown in Figure 1.

At this moment as shown in Figure 1, first protuberance 90 of EGR cam 80 and the second protuberance 112 mutual butts of the application of force with assembly body 82.Because the application of force is rotated action with the inner loop component 102 of assembly body 82 as described above, so first protuberance 90 of EGR cam 80 is pushed with second protuberance 112 of assembly body 82 by the application of force, then EGR cam 80 also is rotated action thus.

When first cam part 86 or second cam part, the 88 arrival assigned positions of the EGR cam 80 that is rotated action, then the rocking arm of being pushed by this first cam part 86 or second cam part 88 98 carries out rotational action, and EGR valve 72 is pushed via pressing component 100 in its end.Thus in the 74 compressed whiles of valve spring and EGR valve 72 leave and, consequently firing chamber 24 be communicated with gas storage chamber 70 from EGR mouth 68 to firing chamber 24 side displacements.Therefore, the waste gas that gas storage chamber 70 is stored is imported to firing chamber 24, supplies with burning via intakeport 26 with the air and the new fuel that imports of new importing in next suction stroke.

Certainly, when first cam part 86 or second cam part 88 are left from rocking arm 98, then utilize elongation valve spring 74 elastic acting force and EGR valve 72 turns back to original position, in place to EGR mouth 68.

As above, when the mutual butt of first protuberance 90 and second protuberance 112, then EGR valve 72 is opened repeatedly continuously, cuts out.

On the other hand, become minimumly when unloaded and aperture when becoming maximum maximum load in described air throttle aperture, described CPU is that low load area is to high load area according to then judging from the telecommunications breath of engine load sensor and turn-sensitive device etc.At this moment do not need EGR valve 72 to be opened and made waste gas turn back to firing chamber 24.

So described CPU sends control signal via cable 134, send the instruction of " bar 130 is advanced " to electromagnetic element 128.Bar 130 carries out forward motion as shown in Figure 5 by this control signal.

Along with this forward motion, its square front end 126,126 is the center rotational action with pivot 124 via ending axle 132 then with first pawl 114 and second pawl 116 that this bar 130 links.

As mentioned above, first pawl 114 and second pawl 116 all link via screw 120,120 and outer coil component 104.Therefore, outer coil component 104 all retreats along the right side of axial direction in Fig. 5 of camshaft 38 with assembly body 82 integral body down to the application of force.Certainly, at this moment the application of force is guided by the tooth portion 110 of camshaft 38 with assembly body 82.This is because the cause of tooth portion 108 engagements of this tooth portion 110 and inner loop component 102.

Second protuberance 112 of inner loop component 102 leaves from first protuberance 90 of EGR cam 80 by this backward movement.Therefore, do not transmit turning effort power to EGR cam 80, final then spinning movement EGR cam 80 stops.Certainly first cam part 86 of EGR cam 80 and second cam part 88 also not with rocking arm 98 butts, therefore, EGR valve 72 is not pushed by rocking arm 98 via pressing component 100 yet.Being that EGR valve 72 is kept to EGR mouth 68 state in place, in other words is to keep EGR valve 72 pent states, and the result keeps the state that firing chamber 24 and gas storage chamber 70 are interdicted.Be that EGR valve 72 becomes halted state, so waste gas can not return to firing chamber 24.

At this moment, camshaft 38 is proceeded spinning movement.Therefore constitute the inner loop component 102 continuation spinning movements of the application of force with assembly body 82.But as mentioned above, owing to do not transmit turning effort power to EGR cam 80 from camshaft 38, so EGR cam 80 is not rotated action.The locating stud 92 that camshaft 38 is provided with is at annular slot 84 intrinsic displacements.Therefore, locating stud 92 does not transmit turning effort power to EGR cam 80 yet.

Because annular slot 84 is inserted with screw in the location, so can avoid EGR cam 80 to carry out displacement along the axial direction of camshaft 38.Promptly can also suppress to produce the positional deviation of EGR cam 80.

When described air throttle aperture is changed from this state, then the load of internal-combustion engine 12 becomes intermediate speed region to the part area, and the CPU that detects this situation sends the instruction of " bar 130 is retreated " to electromagnetic element 128 via cable 134.Bar 130 carries out backward movement by this control signal, is that rotational action is carried out at the center with pivot 124 via ending axle 132 then with first pawl 114 and second pawl 116 that this bar 130 links simultaneously.Finally as shown in Figure 1, second protuberance 112 of inner loop component 102 can with first protuberance, 90 butts of EGR cam 80, the result is that the turning effort power of inner loop component 102 can be transmitted to EGR cam 80.Be that EGR valve 72 can open and close, then waste gas returns to firing chamber 24 when EGR valve 72 is opened.

According to present embodiment, only assembling has application of force assembly body 82 so simple structures that relative EGR cam 80 has butt or leaves the position, just can be according to the load state of internal-combustion engine 12 EGR valve 72 being set for can open and-shut mode or keep closed condition (halted state) etc., and also is very easy to from the change of a state to another state.

For example, by EGR valve 72 is set for halted state, just can expect to improve velocity of combustion, and can suppress to occur pinking obvious hour of the load of this internal-combustion engine 12 or when obviously big.

In the above-described embodiments EGR valve 72 be controlled to can open and-shut mode or any EGR valve open and close controlling mechanism of halted state constituted with assembly body 82 and displacement mechanism by EGR cam 80, the application of force, as long as but make EGR valve 72 can from can open and-shut mode to halted state and from halted state to can the open and-shut mode change, then also can be any structure.

In addition, driver also can be a housing structure.

Claims

1, a kind of EGR device is attached to internal-combustion engine, and this internal-combustion engine possesses: be arranged at the intakeport that air is imported to the firing chamber Aspirating valves, be arranged at the outlet valve that carries out the relief opening of exhaust at the waste gas of described combustion chambers burn, it is characterized in that having:

The gas storage chamber, it stores described waste gas;

2, EGR device as claimed in claim 1 is characterized in that, described EGR valve open and close controlling mechanism has:

3, EGR device as claimed in claim 2 is characterized in that, described displacement mechanism has: handle sturcture, and it controls the non-rotating portion that possesses described force application mechanism; Driver, it makes the axial direction displacement of described handle sturcture along described camshaft.