CN102787923B

CN102787923B - The exhaust gas recirculatioon controller of internal combustion engine

Info

Publication number: CN102787923B
Application number: CN201210156089.1A
Authority: CN
Inventors: 关田健太郎; 藤原一夫; 小岛充; 寺田保男
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2011-05-18
Filing date: 2012-05-15
Publication date: 2016-06-15
Anticipated expiration: 2032-05-15
Also published as: CN102787923A

Abstract

The present invention relates to the exhaust gas recirculatioon controller of a kind of internal combustion engine. The exhaust gas recirculatioon controller of internal combustion engine includes using the parameter that engine speed (Ne) and throttling arrangement aperture (TH) are sprayed as fuel shutoff to map the control part controlling to open or close actuator EGR control according to EGR operation scope in the processes such as speed reduction of motorcycle when meeting fuel cut condition. Fuel cut condition is mapped by the fuel cut-off that car speed (V), engine speed (Ne) and throttling arrangement aperture (TH) are determined to be determined, if and it is arranged to engine speed (Ne) at relatively low setting (NeL) below, then terminate fuel injection to cut off, and re-start fuel injection. The minimum (Ne1) of the engine speed (Ne) constituting the EGR operation scope (D) that EGR operation scope maps is configured to the value higher than the relatively low setting (NeL) of fuel cut condition. It addition, EGR does not produce operation noise when ERG controls the beginning of operation and terminates.

Description

The exhaust gas recirculatioon controller of internal combustion engine

Technical field

The present invention relates to the exhaust gas recirculatioon controller of internal combustion engine, and aerofluxuss are returned to combustor more particularly to a kind of and make the exhaust gas recirculatioon controller of its internal combustion engine again burnt together with sucking gas.

Background technology

In known exhaust gas recirculatioon (EGR) system, some aerofluxuss coming from internal combustion engine are sucked again at entrance side so that aerofluxus is burnt again, in order to improve exhaust gas purification and fuel economy. Equally, in the internal combustion engine with fuel injection system, it is possible to perform so-called fuel cut-off and control, in order to stop fuel injection at regulation car speed and above speed in the processes such as the deceleration that throttling arrangement completely closes.

JP-ANo.2004-108329 discloses a kind of internal combustion engine using egr system, and egr system makes some aerofluxuss return to combustor from inhalation port via the bypass path making inhalation port connect with exhaust port. Need learning process to regulate the standard openings of EGR valve, in order to the ageing deterioration situation according to the attachment of such as impurity opens or closes bypass path while carrying out fuel cut-off control.

But in the JP-ANo.2004-108329 technology described, opening learning process owing to performing EGR valve in fuel cut-off control process, EGR controls to be considered always to control to terminate to perform afterwards with fuel cut-off in fuel cut-off process, and EGR controls to be turned off. This means that the burning condition of internal combustion engine changes due to the EGR shutoff controlled, this can change the torque that internal combustion engine produces. More particularly, in many cases, after fuel cut-off, throttling arrangement aperture is little and motor torque is little, driver can EGR control turn off time easily feel torque some change.

In known exhaust gas recirculatioon (EGR) system, some aerofluxuss coming from internal combustion engine suck again at entrance side, so that it burns again, thus realizing exhaust gas purification, and improve fuel economy. Egr system be classified broadly into the bypass path that wherein makes inhalation port connect with exhaust port for by some aerofluxuss from inhalation port return to combustor outside EGR formula and wherein air bleeding valve slightly open suction stroke process some aerofluxuss to be returned to the internal EGR formula of combustor from exhaust port.

Japanese Patent Publication document No.4555771 discloses the egr system of a kind of internal EGR formula, and wherein the rocker arm of air bleeding valve is oppressed by solenoid, in order to air bleeding valve is opened in the hope timing in suction stroke process, and is left out the rotational angle of camshaft.

But, the technology described in Japanese Patent Publication document No.4555771 has a problem in that solenoid must be energized to open air bleeding valve in each suction stroke while performing EGR control. Therefore, the operation being difficult to air bleeding valve in the high speed range of internal combustion engine controls.

On the other hand, by the actuating of air bleeding valve carry out EGR control be likely to construct be to provide for EGR cam for EGR control determine activate air bleeding valve timing. In EGR control, not only need to engage the cam for normal operating, in addition it is also necessary to engage EGR cam, to activate air bleeding valve. In this construction, when wishing accurately to control air bleeding valve in high-speed range, the problem producing noise when there is two kinds of cams of conversion.

Summary of the invention

The purpose of embodiments of the present invention is in that to provide the exhaust gas recirculatioon controller of a kind of internal combustion engine, solves the described problem of conventional art, does not make driver feel that torque changes when fuel cut-off controls and EGR controls and turns on and off.

In order to realize object above, according to the embodiment of the present invention, the exhaust gas recirculatioon controller of a kind of internal combustion engine is provided, it is used for performing EGR control, in order to opens the air bleeding valve of internal combustion engine by the operation in actuator stroke outside instroke and some aerofluxuss returns to combustor and makes it again burn. EGR controls to be operated by described actuator so that the state and the described air bleeding valve that activate according to the cam contour of the variable cam component of valve operation of cam axle synchronous axial system at described air bleeding valve do not carry out changing between the state activated turning on and off according to the cam contour of described cam member. Control part is arranged to use at least engine speed Ne and throttling arrangement aperture TH to control described actuator as parameter to map according to EGR operation scope. The fuel injection of described control part fuel shutoff spraying system in the processes such as vehicle deceleration when meeting fuel cut condition. Fuel cut condition is mapped by the fuel cut-off determined by car speed V, engine speed Ne and throttling arrangement aperture TH to be determined, if and be configured to described engine speed Ne when relatively low below setting NeL, terminate fuel injection to cut off, and re-start fuel injection, and the minimum Ne1 constituting the engine speed Ne of the EGR operation scope D that EGR operation scope maps is configured to the relatively low value high for setting NeL than fuel cut condition.

According to the embodiment of the present invention, described actuator enables to be attached to the variable cam member slide of described valve operation of cam axle, in order to can slide axially and mode does not operate described air bleeding valve in relative rotation. The actuator that described EGR controls by the described variable cam component that slides makes it with described air bleeding valve engagement or disengagement turns on and off. When described EGR controls to turn off, described air bleeding valve is operated by the exhaust cam lobes being fixed on described valve operation of cam axle and close with exhaust rocker knee-joint. When described EGR controls to connect, described air bleeding valve is operated by described variable cam component and the exhaust cam lobes closed with described exhaust rocker knee-joint.

According to the embodiment of the present invention, it is gradually reduced between the higher setting NeH controlling to be gradually reduced the timing of the fuel cut-off speed minimum Ne1 and the relatively low setting NeL of described fuel cut condition being arranged in the engine speed Ne constituting described EGR operation scope D as starting fluid cut-off velocity.

According to the embodiment of the present invention, the difference between described higher setting NeH and described minimum Ne1 is more than the difference between described relatively low setting NeL and described higher setting NeH.

According to the embodiment of the present invention, described control part starts enumerator when the described fuel cut-off speed of startup is gradually reduced control, and when described enumerator reaches setting, described control part terminates described fuel cut-off speed and is gradually reduced control and fuel cut-off speed, in order to re-start fuel injection.

According to the embodiment of the present invention, described EGR operation scope is mapping through the 2D including described engine speed Ne and throttling arrangement aperture TH and maps and limit, and described EGR operation scope D is by being arranged in by the almost triangle prescribed limit described engine speed Ne from which with low engine speed Ne and high throttling arrangement aperture TH in prescribed limit Ne1-Ne2 and described throttling arrangement aperture TH is positioned at the rectangle of prescribed limit 0-TH2 and gets rid of and constitute.

According to the embodiment of the present invention, described fuel cut condition includes described throttling arrangement aperture TH and is positioned at fully closed position.

According to the embodiment of the present invention, described EGR operation scope maps and includes arranging the delayed of hysteresis characteristic for described EGR operation scope D and arrange scope E.

According to the embodiment of the present invention, actuator enables to be attached to the variable cam member slide of valve operation of cam axle, in order to can slide axially and mode does not operate air bleeding valve in relative rotation. EGR controls by actuator slip variable cam component, makes itself and air bleeding valve engagement or disengagement turn on and off. When EGR controls to turn off, air bleeding valve is operated by the exhaust cam lobes being fixed on valve operation of cam axle and close with exhaust rocker knee-joint. When EGR controls to connect, air bleeding valve is operated by variable cam component and the exhaust cam lobes closed with exhaust rocker knee-joint, and control part is arranged to use at least engine speed and throttling arrangement aperture to control actuator as parameter to map according to EGR operation scope. The fuel of control part fuel shutoff spraying system in the processes such as vehicle deceleration when meeting fuel cut condition sprays, and fuel cut condition is mapped by the fuel cut-off determined by car speed, engine speed and throttling arrangement aperture and determines. If engine speed is below relatively low setting, terminate fuel injection to cut off, and re-start fuel injection, and the minimum constituting the engine speed of the EGR operation scope that EGR operation scope maps is configured to the value higher than the relatively low setting of fuel cut condition, thus carrying out in moderating process while fuel injection, it is prevented that change between EGR operation scope and EGR not operation scope.

Such as, if being transformed into EGR operation scope from EGR not operation scope while carrying out fuel injection in moderating process, burning condition can become better due to EGR control, causes electromotor output to be improved. This can carry out (this can affect cornering ability) in the process slowed down at closedown throttling arrangement and improve electromotor output. On the other hand, by the setting according to the present invention, the fuel cut-off control process do not carry out fuel injection carries out the conversion of EGR operation scope, it means that EGR controls to turn on and off when not affecting electromotor output.

According to the embodiment of the present invention, it is gradually reduced between minimum and the relatively low setting of fuel cut condition that the higher setting controlling to be gradually reduced the timing of fuel cut-off speed is arranged in the engine speed constituting EGR operation scope as starting fluid cut-off velocity, fuel cut-off speed is gradually reduced from fuel cut-off controlled state, thus the change of the electromotor output (re-starting fuel injection) when suppressing fuel again to spray so that cornering ability improves.

According to the embodiment of the present invention, owing to the difference between higher setting and minimum is more than the difference between relatively low setting and higher setting, it is gradually reduced control from fuel cut-off speed to start to its cycle terminated to shorten, thus the fuel consumption reduced in this cycle.

According to the embodiment of the present invention, owing to control part starts enumerator when starting fluid cut-off velocity is gradually reduced control, and when enumerator reaches setting, control part terminates fuel cut-off speed and is gradually reduced control and fuel cut-off speed, to re-start fuel injection, it is gradually reduced from fuel cut-off speed and controls to start to its cycle terminated and can increase the condition that enumerator or setting arrange and freely change by changing. Therefore, even if differences such as the types of internal combustion engine, fuel cut-off speed is gradually reduced control and can smoothly perform.

According to the embodiment of the present invention, EGR operation scope is mapping through the 2D including engine speed and throttling arrangement aperture and maps restriction, and EGR operation scope is by being in prescribed limit by the almost triangle prescribed limit engine speed from which with low engine speed and high throttling arrangement aperture and throttling arrangement aperture is in the rectangle in prescribed limit and gets rid of constitutes, and controls to realize improvement and the improvement of exhaust gas purifying effect of electromotor output thereby through the EGR turned off in the 2D triangle prescribed limit mapped.

According to the embodiment of the present invention, being fully closed owing to fuel cut condition includes throttling arrangement aperture, fuel cut-off controls can to reduce the intention of speed driver and is confirmed based on throttling arrangement aperture and carries out afterwards.

According to the embodiment of the present invention, scope is set owing to the mapping of EGR operation scope includes arranging the delayed of hysteresis characteristic for EGR operation scope, it is possible to prevent solenoid remagnetization and degaussing near the border of EGR operation scope.

The purpose of embodiments of the present invention is in that to provide the exhaust gas recirculatioon controller of a kind of internal combustion engine, which solve the described problem of conventional art, do not produce operation noise when the EGR beginning controlled and end, and activate air bleeding valve to carry out EGR control in correct timing.

According to the embodiment of the present invention, the exhaust gas recirculatioon controller of a kind of internal combustion engine is provided, it is used for performing EGR control, in order to is opened the air bleeding valve of described internal combustion engine by the operation in actuator stroke outside instroke, some aerofluxuss returns to combustor and makes it again burn. EGR controls to be operated by described actuator so that the state and the described air bleeding valve that activate according to the cam contour of the variable cam component of valve operation of cam axle synchronous axial system at described air bleeding valve do not carry out changing between the state activated turning on and off according to the cam contour of described cam member. control part is arranged to use at least engine speed Ne and throttling arrangement aperture TH to control described actuator as parameter to map according to EGR operation scope. when the operating condition of described internal combustion engine is in the EGR operation scope D that described EGR operation scope maps, described control part activates described air bleeding valve 34 to carry out EGR control according to the cam contour of described variable cam component, and open at described variable cam component in the operating condition of described internal combustion engine described air bleeding valve cycle T process in outside described EGR operation scope D time, the described part that controls waits, until described valve is opened cycle T and is terminated, and described air bleeding valve is fully closed, then pass through the state that the cam contour being transformed into according to described variable cam component does not perform the actuating of described air bleeding valve, turn off described EGR to control.

According to the embodiment of the present invention, described actuator enables to be attached to the variable cam member slide of described valve operation of cam axle, so that can slide axially and mode does not operate described air bleeding valve in relative rotation, described EGR controls to make itself and described air bleeding valve engagement or disengagement turn on and off by the described actuator described variable cam component that slides. When described EGR controls to turn off, described air bleeding valve is operated by the exhaust cam lobes being fixed on described valve operation of cam axle and close with exhaust rocker knee-joint. When described EGR controls to connect, described air bleeding valve is operated by described variable cam component and the exhaust cam lobes closed with described exhaust rocker knee-joint. It addition, when the operating condition of described internal combustion engine is in the EGR operation scope D that described EGR operation scope maps, described control part makes described variable cam component close with described exhaust rocker knee-joint, in order to perform EGR and control. Additionally, open at described variable cam component in the operating condition of described internal combustion engine described air bleeding valve cycle T process in outside described EGR operation scope D time, the described part that controls waits, until described valve is opened cycle T and is terminated, and described air bleeding valve is fully closed, then passes through and turn off described EGR control so that described variable cam component is disengaged.

According to the embodiment of the present invention, in the operating condition of described internal combustion engine outside described EGR operation scope D and when not opening in the cycle T of described air bleeding valve at described variable cam component simultaneously, described control part makes described variable cam component be disengaged, without waiting for.

According to the embodiment of the present invention, described internal combustion engine operating condition described variable cam component open described air bleeding valve cycle T process in enter described EGR operation scope map EGR operation scope D time, the described part that controls waits, until described valve is opened cycle T and is terminated, and described air bleeding valve is fully closed, then engage described variable cam component.

According to the embodiment of the present invention, whether the operating condition of described internal combustion engine is opened in the cycle T of described air bleeding valve at described variable cam component and is detected by least crank pulse data of described internal combustion engine.

According to the embodiment of the present invention, described EGR operation scope maps and is included as described EGR operation scope D and arranges the delayed of hysteresis characteristic and arrange scope E.

According to the embodiment of the present invention, described EGR operation scope is mapping through the 2D including described engine speed Ne and throttling arrangement aperture TH and maps and limit, and described EGR operation scope D is by being arranged in by the almost triangle prescribed limit described engine speed Ne from which with low engine speed Ne and high throttling arrangement aperture TH in prescribed limit Nei-Net and described throttling arrangement aperture TH is positioned at the rectangle of prescribed limit 0-TH2 and gets rid of and constitute.

According to the embodiment of the present invention, the plunger as the operation axle of described actuator is parallel to described valve operation of cam axle location, described variable cam component by helical spring towards the direction constant bias being disengaged with described air bleeding valve. The sliding motion of described plunger is delivered to described variable cam component via by the swing arm of the pivoting bolt swingable axle journal supporting vertically-oriented relative to described plunger and described valve operation of cam axle. When described actuator magnetizes, described variable cam component is resisted the biasing force of described helical spring and is slided, and described variable cam component engages described exhaust rocker arm.On the other hand, when described actuator degaussing, both are disengaged again by the biasing force of described helical spring.

According to the embodiment of the present invention, actuator enables to be attached to the variable cam member slide of valve operation of cam axle, so that can slide axially and mode does not operate air bleeding valve in relative rotation, and EGR controls by actuator slip variable cam component, makes itself and air bleeding valve engagement or disengagement turn on and off. when EGR controls to turn off, air bleeding valve is operated by the exhaust cam lobes being fixed on valve operation of cam axle and close with exhaust rocker knee-joint. when EGR controls to connect, air bleeding valve is operated by variable cam component and the exhaust cam lobes closed with exhaust rocker knee-joint. control part is arranged to use at least engine speed and throttling arrangement aperture to control actuator as parameter to map according to EGR operation scope, wherein when the operating condition of internal combustion engine is within the scope of the EGR operation that EGR operation scope maps, control part makes variable cam component close with exhaust rocker knee-joint, to perform EGR control, and open at variable cam component in the operating condition of internal combustion engine air bleeding valve cycle process in outside EGR operation scope time, control part to wait, until end cycle opened by valve, and air bleeding valve is fully closed, then pass through and turn off EGR control so that variable cam component is disengaged, thus the air bleeding valve timing in EGR control is by making variable cam component determine with exhaust rocker knee-joint is incompatible, and the operation of air bleeding valve is increased along with engine speed and becomes complexity controlling the method that directly can not be opened by solenoid driving force such as air bleeding valve. additionally, when turning off EGR and controlling, even if being stayed open and not within the scope of EGR operation by variable cam component at air bleeding valve, it is also not possible to produce, due to the closing suddenly of air bleeding valve of valve spring bias, the sound contacted with cylinder, because variable cam component does not operate, until exhaust valve closure. in other words, it is possible to obtain, when not producing contact sound when EGR controls and turns on and off, the exhaust gas recirculatioon controller that can mechanically determine EGR valve timing.

According to the embodiment of the present invention, when the operating condition of internal combustion engine is outside EGR operation scope and not within the cycle that air bleeding valve opened by variable cam component, control part makes variable cam component be disengaged, without waiting for, even if thus in EGR control process, when air bleeding valve is fully closed, it is also not possible to produce contact sound, therefore by making variable cam component be disengaged, it is possible to quickly realize to turning off the conversion of EGR state.

According to the embodiment of the present invention, open in the periodic process of air bleeding valve at variable cam component, when the operating condition of internal combustion engine enters the EGR operation scope that EGR operation scope maps, control part waits until that end cycle opened by valve, and air bleeding valve is fully closed, then making variable cam component engage, therefore exhaust cam component can not be opened in the periodic process of air bleeding valve at variable cam component and slide, and consequently allows for stable conversion and control.

The further scope of the practicality of the present invention will be made apparent from from the detailed description provided subsequently. It should be appreciated that although detailed description and object lesson describe the preferred embodiment of the present invention, but detailed description and object lesson are only provided by example, because those of ordinary skill in the art is readily apparent that the multiple change in the spirit and scope of the present invention and modification being described in detail from this.

Accompanying drawing explanation

To be more fully understood from the present invention from detailed description given below and accompanying drawing, accompanying drawing is only provided by example, and is therefore not intended to the present invention, in accompanying drawing:

Fig. 1 is the left side view of the motorcycle of the exhaust gas recirculatioon controller adopting internal combustion engine according to the embodiment of the present invention;

Fig. 2 is the enlarged side view of internal combustion engine;

Fig. 3 is the close-up sectional view of the internal combustion engine seen from vehicle right side;

Fig. 4 is the close-up sectional view of the internal combustion engine seen from vehicle rear;

Fig. 5 is along the line V-V of Fig. 4 sectional view intercepted;

Fig. 6 is the decomposition diagram of valve operation of cam axle, steady statue cam member and variable cam component;

Fig. 7 is the sectional view of valve operation of cam axle during assembling, steady statue cam member and variable cam component;

Fig. 8 is along the line 8-8 of Fig. 7 sectional view intercepted;

Fig. 9 is the perspective view of swing arm;

Figure 10 is the top view of cylinder cap;

Figure 11 indicates that the block diagram of the structure of the exhaust gas recirculatioon controller of internal combustion engine according to the embodiment of the present invention;

Figure 12 indicates that the curve chart of the timing activating air-breathing and air bleeding valve;

Figure 13 determines that the data performing the EGR scope controlled map;

Figure 14 indicates that the flow chart of the order of the cam-operated solenoid control of EGR; And

Figure 15 indicates that the flow chart of the order that fuel cut-off controls in moderating process.

Detailed description of the invention

The preferred embodiment of the present invention will be described in detail with reference to the attached drawings. Fig. 1 is the left side view of the motorcycle 1 of the exhaust gas recirculatioon controller adopting the internal combustion engine according to one embodiment of the present invention. Fig. 2 is the enlarged side view of internal combustion engine 10. Internal combustion engine 10 (four-cycle, single-cylinder petrol engine) is installed to the main body frame 2 of motorcycle 1, and its bent axle 11 is directed in the lateral direction of the vehicle.

Main body frame 2 includes head tube 2h, a pair left and right main frame 2m extended downwardly against the rear portion of vehicle from head tube 2h and from the reclinate orientated at steep inclinations part 2ma in the rear end of main frame 2m. The orientated at steep inclinations part 2ma location of main frame 2m it is nearly parallel to from the head tube 2h single underframe 2d steeply rearwardly and downwardly extended.

A pair left and right seat rail 2s extends rearward above through gusset 2g from orientated at steep inclinations part 2ma. Seat rail 2s is supported from below by the rear support 2b being connected with the bottom of orientated at steep inclinations part 2ma.

A pair left and right front fork 3 is supported swingably by head tube 2h, and front-wheel Fw is rotatably journalled to its lower end. Trailing wheel Rw is rotatably journalled swing arm 4 thereon and is supported to the bottom of orientated at steep inclinations part 2ma by axle journal swingably, and rear portion cushion 5 is between swing arm 4 and gusset 2g. Fuel tank 6 by from above across in the way of be installed on main frame 2m, and by seat rail 2s supporting seat 7 be arranged in fuel tank 6 after.

The internal combustion engine 100 suspended by main frame 2m and underframe 2d is the SOHC formula electromotor integrated with actuating device, and cylinder body 14 in actuating device, cylinder cap 15 and top cover 20 are arranged in the way of tilting slightly forward. At the rear portion of cylinder cap 15, air cleaner case 8a is via suction nozzle 8 and the throttling arrangement valve attachment being fitted into. On the other hand, in the front portion of cylinder cap 15, the exhaustor 9 of the acoustic filter 9m at the rear portion being connected to vehicle body is installed.

Internal combustion engine 10 according to this embodiment has is wishing that timing opens air bleeding valve some aerofluxuss to return to combustor the exhaust gas re-circulation apparatus (egr system) making it again burn in the process of suction stroke. More particularly, camshaft for activating air bleeding valve has the cam lobe for normal operating and the cam lobe controlled for EGR so that what do not perform in course of normal operation performs for the EGR cam lobe controlled by arbitrarily activating for the EGR air bleeding valve controlled operation.As the actuator activated for the EGR cam lobe controlled, solenoid 61 is attached to the top cover 20 of internal combustion engine 10.

With reference to Fig. 2, in the crankcase 13 of the bent axle 11 of axle journal supporting wherein, for holding the rear portion of the crankshaft room 13C of 13M location formed in which, the actuating device room bent axle 11 of actuating device, the output shaft 12 of actuating device from its rear portion in the vehicle lateral direction to the left direction stretch out. The oil groove 13P of storage oil is integrally formed in the lower section of crankshaft room 13C.

It addition, referring also to Fig. 3. Fig. 3 is the close-up sectional view of the internal combustion engine 10 that the right side from vehicle is seen. The crankcase 13 being formed with crankshaft room 13C, actuating device room 13M and oil groove 13P is divided into left part and right part in the vehicle lateral direction. It is placed on crankshaft room 13C including with the cylinder body 14 of the sleeve 14a being inserted and the cylinder cap 15 of valve system 40.

Camshaft keeper 16, cylinder cap 15 and cylinder body 14 are overall fixing by hook bolt 17 and crankcase 13. Top cover 20 is placed on cylinder cap 15 via flexible sealing component 18. Piston 31 is with reciprocally and be slidably attached in the sleeve 14a of cylinder body 14, and piston 31 and bent axle 11 are connected by connecting rod 32, in order to constitute crank mechanism.

In cylinder cap 15, combustor 15z by being formed towards the mode of piston 31 on cylinder axial direction, and suction port 15i extends from combustor 15z towards vehicle rear simultaneously, and exhaust port 15e extends from combustor 15z towards front part of vehicle.

Inlet valve 33 and air bleeding valve 34 are by integral installation respectively to the valve guiding piece turntable supporting of cylinder cap 15. Along with inlet valve 33 and air bleeding valve 34 are by valve system 40 actuating, they are Tong Bu with the rotation of bent axle 11, thus opening and closing the aspiration openings of suction port 15i and the exhaust port of exhaust port 15e.

Fig. 4 is the close-up sectional view of the internal combustion engine 10 seen from vehicle rear. Spark plug 19 is arranged in cylinder cap 15, and its tip is inserted through the top side of combustor 15z. Valve system 40 is activated by the single valve operation of cam axle 41 supported in the vehicle lateral direction by camshaft keeper 16 axle journal.

In camshaft keeper 16, rocker arm shaft 43e and 43i is bearing on valve operation of cam axle 41 in front and rear position. When the swingable axle journal of air-breathing rocker arm 44i supports to rear portion rocker arm shaft 43i, the swingable axle journal of exhaust rocker arm 44e supports to anterior rocker arm shaft 43e.

The cylindrical steady statue cam member 42 with the air inlet cam salient angle 42i formed side by side in its peripheral surface and exhaust cam lobes 42e is press-fitted in valve operation of cam axle 41. Inverted cam sprocket wheel 36 is fixed on valve operation of cam axle 41 left end place in the vehicle lateral direction.

Driving cam sprocket wheel 35 is fixed on bent axle 11, and ring cam set chain 37 bridges between driving cam sprocket wheel 35 and inverted cam sprocket wheel 36 (see Fig. 2). At half (1/2) place of the velocity of rotation of bent axle 11, the rotative power of bent axle 11 is passed to valve operation of cam axle 41. Therefore, air-breathing rocker arm 44i and exhaust rocker arm 44e and bent axle 11 synchronized oscillation, and inlet valve 33 and air bleeding valve 34 open and close in suitable timing.

At cylinder body 14, cylinder cap 15 and top cover 20 on the left side of vehicular transverse direction, cam chain room 14c, 15c and 20c form single continuous cavity. For cam chain 37, in cam chain room 14c, 15c and 20c, it is anterior by vertically guiding with the chain guide 38 extended linearly, and its rear portion is kept by arc-shaped bend tensioning sliding part 39, thus keeping enough tensionings.The rear portion of tensioning sliding part 39 is oppressed by tensioning lifting mechanism 39t.

Fig. 5 is along the line V-V of Fig. 4 sectional view intercepted. Fig. 6 is the decomposition diagram of valve operation of cam axle 41, steady statue cam member 42 and variable cam component 50. Accompanying drawing labelling same as above represents identical or equivalent element. Valve operation of cam axle 41 is to have central shaft string holes 41h the cylindrical member manufactured by cold forging pressure high accuracy.

The spline shaped portion 41c of the largest outer diameter with six spline conduit 41cs forms the axial centre at valve operation of cam axle 41. Have and formed at spline shaped portion 41c on the right side of vehicular transverse direction through the swedged cam keeper 41r of shoulder, and there is further swedged necked part 41j formation at its right-hand member. There is left circles cylindrical section 411 equally that be slightly reduced diameter formed in the left side of spline shaped portion 41c. Elongated hole 41s for elongated same shape is respectively formed in positioned diagonally two spline conduit 41cs in the axial direction. Keyway 41k is formed at the left end place of valve operation of cam axle 41.

The steady statue cam member 42 with exhaust cam lobes 42e and air inlet cam salient angle 42i with the relative angle press-fit specified and is fixed on cam keeper 41r. Steady statue cam member 42 is from the right side of cam keeper 41r and the exhaust cam lobes 42e press-fit vehicular transverse direction upper left side, until its contact spline shaped portion 41c. Therefore, exhaust cam lobes 42e and spline shaped portion 41c neighboringly and valve operation of cam axle 41 form entirety.

On the other hand, as opening air bleeding valve 34 in suction stroke process to perform the EGR EGR cam controlled, variable cam component 50 is installed to the spline shaped portion 41c of valve operation of cam axle 41 by spline. It is installed to the prominent conduit 50cs of six splines in the spline groove conduit 41cs formed in valve operation of cam axle 41 to be formed in the inner peripheral surface of variable cam component 50. Variable cam salient angle 50e forms the right-hand member place of the outer surface at variable cam component 50 in the vehicle lateral direction.

Most of periphery formation diameter of variable cam salient angle 50e is equal to or is slightly lower than the basic circle of the base circle diameter (BCD) of exhaust cam lobes 42e and EGR controlled to the cam nose stretched out with prescribed phases angle with little lifting capacity. On the other hand, in the cylindrical part being formed without variable cam salient angle 50e, there is the spline in the inner circumferential being passed through variable cam component 50 and stretch out conduit 50cs and be perpendicular to the pin-and-hole 50p of central axis. Equally, formed in the outer surface of cylindrical part through the peripheral groove 50v of the outside opening of pin-and-hole 50p.

Variable cam component 50 with regulation relative angle from vehicular transverse direction when passing on left the spline shaped portion 41c that spline is installed to valve operation of cam axle 41, the pin-and-hole 50p of variable cam component 50 overlaps with the elongated hole 41s of valve operation of cam axle 41.

Fig. 7 is valve operation of cam axle 41, steady statue cam member 42 and variable cam component 50 sectional view when assembling. Fig. 8 is along the line 8-8 of Fig. 7 sectional view intercepted. Valve operation of cam axle 41 by being installed to the bearing 46 of necked part 41j and being installed to the bearing 45 of left circles cylindrical section 411 at its left end place and be rotatably journalled (see Fig. 4) relative to camshaft keeper 16 at its right-hand member place. By flange member 47 being press-fitted into left circles cylindrical section 411 via key 49 with regulation relative angle, bearing 45 is by spline shaped portion 41c clamping.

Radially-protruding flange portion 47f forms the left end at flange member 47 shown in the drawings. Driving cam sprocket wheel 36 is attached to flange member 47 by screw 48 is screwed in the screw hole 36h made in flange portion 47f and screw hole 47h. The left end of valve operation of cam axle 41 engages the centre bore 36c of driving cam sprocket wheel 36.

The sliding bar 53 constituting the slide mechanism 52 variable cam component 50 being slided and shift is inserted into the central shaft string holes 41h of the valve operation of cam axle 41 that can slide in the axial direction. The both sides place of sliding bar 53 heart diameter portion 53c wherein has the diameter being slightly reduced, and has a perpendicular to the pin-and-hole 53p made of center diameter portion 53c axially.

By sliding bar 53 being inserted the central shaft string holes 41h of valve operation of cam axle 41, then pin-and-hole 53p and the elongated hole 41s of valve operation of cam the axle 41 and pin-and-hole 50p of variable cam component 50 is directed at, and single attachment pegs 54 is inserted between the pin-and-hole 50p of alignment, elongated hole 41s and pin-and-hole 53p and assemble slide mechanism 52.

The attachment pegs 54 interior diameter than the peripheral groove 50v formed in variable cam component 50 is short, and prevents from coming off by the retaining ring 55 being installed in peripheral groove 50v. Therefore, attachment pegs 54 its two ends place engage variable cam component 50 pin-and-hole 50p, and with variable cam component 50 mass motion. Therefore, along with sliding bar 53 horizontally slips in the axial direction in central shaft string holes 41h, attachment pegs 54 is by elongated hole 41s guided-moving, and variable cam component 50 axially-movable overall with attachment pegs 54.

In the central shaft string holes 41h of valve operation of cam axle 41, female thread is formed in inner peripheral surface at its right-hand member. Helical spring 56 inserts central shaft string holes 41h from right side, followed by screw fixing band flange bolt 57. Therefore, helical spring 56 between center diameter portion 53c and the flanged pin bolt 57 of sliding bar 53, constitute wherein sliding bar 53 by the slide mechanism 52 of constant bias to left side.

Wherein steady statue cam member 42, variable cam component 50, inverted cam sprocket wheel 36 and bearing 45 and 46 are attached to the half of its periphery and assemble the valve operation of cam axle 41 of form and be inserted in the left side of cam keeper 16 and right side from left side in the vehicle lateral direction in the axial hole of the left and right abutment wall 16 (16L and 16R is shown in Fig. 4) stretched out toward each other. Then, valve operation of cam axle 41 by being installed to the axial hole of right abutment wall 16R and being installed to by left side bearing 45 and be rotatably journalled camshaft keeper 16 in the axial hole of left abutment wall 16L by right side bearing 46 so that it is with steady statue cam member 42 and variable cam component 50 unitary rotation.

Right side bearing 46 on the shoulder abutting against right abutment wall 16R in the way of position, and left side bearing 45 positions (see Fig. 4) by being fixed to the holding plate 59 of left abutment wall 16L by bolt 58.

With reference to Fig. 4, the sliding bar 53 owing to being biased into left side by helical spring 56 is resisted the biasing force of helical spring 56 and is pulled to right side, and variable cam component 50 slides into right side via attachment pegs 54, shown in solid such as accompanying drawing. Therefore, variable cam component 50 is more nearly exhaust cam lobes 42e, and the roller 44er of exhaust rocker arm 44e to contact them in the way of exhaust cam lobes 42e and variable cam salient angle 50e. Therefore, unrelated with the normal timing opened and closed during air bleeding valve 34 by exhaust cam lobes 42e, air bleeding valve 34 can be opened and closed, to perform EGR (exhaust gas recirculatioon).The roller 44ir (see Fig. 3) of air-breathing rocker arm 44i is designed to only contact air inlet cam salient angle 42i.

On the other hand, along with sliding bar 43 moves to left side by helical spring 56, as shown in the double dot dash line of Fig. 4, variable cam component 50 slides on left direction, and the roller 44er and variable cam salient angle 50e of exhaust rocker arm 44e do not contact with each other. Therefore, air bleeding valve 34 is opened and closed by exhaust cam lobes 42e in the normal timing for air bleeding valve.

The vario valve timing driving mechanism 60 that sliding bar 53 is shifted onto right side is arranged on the left side of inverted cam sprocket wheel 36 in the vehicle lateral direction. Vario valve timing driving mechanism 60 includes the solenoid 61 as actuator and the power that drives of solenoid 61 is delivered to the swing arm 65 of slide mechanism 52. Solenoid 61 is fixed on the top of the roof 20u of top cover 20, and swing arm 65 axle journal swingably is bearing in the cam chain room 20c of top cover 20.

It is bowl-shape that top cover 20 actually forms the rectangle with roof 20u and perisporium 20s. Roof 20u has the recessed portion 20uh for holding cylindrical solenoid 61 and front side in a vehicle longitudinal direction and the extension 20up (see Fig. 3 and 4) of the contiguous recessed portion 20uh of rear side. Upwardly extending center knob divides 21 to cover in the way of solenoid 61 on the left side at the top cover 20 of vehicular transverse direction to be formed, and prominent protruding 22 formed in a vehicle longitudinal direction center knob divide 21 front side and rear side on (see Fig. 5).

Have wide enough so that the central lumen 21c formation that swing arm 65 inserts divides in 21 at center knob. Dividing in 21 at center knob, the circular port 21h being oriented on the axis of solenoid 61 in the vehicle lateral direction is formed in the way of reaching central lumen 21c. The cylinder 62b that installs coordinated with circular port 21h is arranged on an end face of solenoid 61, and the plunger 61p as operation axle stretches out from installing cylinder 62b. On the outer surface of solenoid 61, mounting flange 62f extends (see Fig. 4) on the front side and rear side in longitudinal direction of car direction.

Solenoid 61 is by inserting circular port 21h by installing cylinder 62b and make prominent protruding 22 abut against mounting flange 62f and bolt 63 screws in the prominent female thread of protruding 22 be secured on top cover 20. The axial direction of the sliding bar 53 being axially parallel in valve operation of cam axle 41 and axis hole 41h at its center of the plunger 61p of solenoid 61.

The rigidity of top cover 20 strengthens by forming recessed portion 20uh and extension 20up. Similarly, since solenoid 61 is fixed in the way of being positioned at recessed portion 20uh, solenoid 61 extends upwardly output and reduces.

A pair guiding wall 23 forms the front and rear dividing central lumen 21c in 21 at center knob, downwardly extends. Elastic bolster guide part 29 is attached to the perisporium 20s of top cover 20, in order to prevent swing arm 65 from abutting against on perisporium 20s.

Fig. 9 is the perspective view of swing arm 65. Swing arm 65 is the component with U-shaped cross section, and it has facing with each other and identically shaped long side plate 65b, connects via long gusset piece part 65a. It is directed that swing arm 65 is nearly parallel to cylinder axial direction, and is positioned in the cam chain room 20c of top cover 20. Side plate 65b has an axle journal support holes 65bh on the position of overcentre, and from axle journal support holes 65bh convergent up and down.

Swing arm 65 divides the central lumen 21c of 21 by its first half inserts center knob and the pivot hole made on the front and back cross side of axle journal support holes 65hh and central lumen 21c is directed at and pivoting bolt 64 is screwed in this some holes carrys out axle journal swingably and be bearing in top cover 20.

The sliding bar 53 slided in valve operation of cam axle 41 is concordant with the alignment surface S (lower surface of flexible sealing component 18) between top cover 20 and cylinder cap 15, and the lower end of swing arm 65 extends slightly from below alignment surface S. On the other hand, it is positioned on sliding bar 53 from the lower end 23a of the guiding wall 23 of front and back in pairs that center ledge 21 downwardly extends. Swing arm 65 abuts superincumbent stop part 24 and is positioned on the lower end of guiding wall 32 (see Fig. 5).

Owing to swing arm 65 is supported by the position axle journal that pivoting bolt 64 is square in the heart wherein, part below its pivoting bolt 64 is longer, and as shown in Figure 4, it is positioned at the top of the inverted cam sprocket wheel 36 being fixed on valve operation of cam axle 41 as the pivoting bolt 64 of the fulcrum P of swing arm 65. The plunger 61p of solenoid 61 abuts against on gusset piece part 65a at upper end, and the lower end that the sliding bar 53 biased by helical spring 56 is below pivoting bolt 64 abuts against on gusset piece part 65a.

Along with the cylinder 62b that installs of solenoid 61 is installed in the circular port 21h that center knob divides 21, the plunger 61p retracted by the solenoid 61 of degaussing is abutted against on the upper end of swing arm 65 and promotes described upper end, the lower end of the swing arm 65 swung abuts against on the left end of the sliding bar 53 biased by helical spring 56, as shown in the double dot dash line of Fig. 4. In other words, the lower end of swing arm 65 is biased by helical spring 65 via sliding bar 53 so that it is can not freely swing. Therefore, even if when plunger 61p is retracted by the actuating of solenoid 61, the upper end of plunger 61p and swing arm 65 also keeps contacting with each other, and the lower end of swing arm 65 and sliding bar 53 also keep contacting with each other, power is passed to sliding bar 53, thus not colliding sound between swing arm 65 and sliding bar 53.

When solenoid 61 activates, swing arm 65 abuts against on stop part 24, and limit its swing, thus will be limited in given position by the sliding motion of sliding bar 53 to the right side of variable cam component 50, and variable cam component 50 stops at the position being slightly off or being close to steady statue cam member 42.

Solenoid 61 owing to being supported by top cover 20 is positioned at the lower section of fuel tank 6, and its operation sound is suppressed by fuel tank 6, therefore, it is difficult to be delivered to passenger. Further, since solenoid 61 is protected by fuel tank 6, it is not necessary to the special shield member of solenoid 61, therefore reduce the quantity of parts.

With reference to Fig. 4, for swing arm 65, it is assumed that it is fulcrum P by the oscillation center of pivoting bolt 64, it abuts against the upper end on the plunger 61p of solenoid 61 and is used as impetus Q, and it abuts against the lower end on sliding bar 53 and is used as application point R. Swing arm 65 impetus Q place is received the plunger 61p stretched out on left direction by the magnetization of solenoid 61 and swings, and makes on the right side of sliding bar 53 slides at the application point R of lower end. On the other hand, along with solenoid 61 degaussing, the biasing force of helical spring 56 makes sliding bar 53 slide into left side, and the plunger 61p of solenoid 61 shifts onto right side.

In other words, when solenoid 61 degaussing, sliding bar 53 slides into left side due to the biasing force of helical spring 56, and variable cam component 50 slides into left side, leave steady statue cam member 42, and air bleeding valve 34 opens and closes for the normal timing of air bleeding valve. By comparing, along with solenoid 61 magnetizes, plunger 61p reaches left side, therefore, sliding bar 53 is resisted the biasing force of helical spring 56 and is slided into right side, and variable cam component 50 slides into right side via attachment pegs 54, and is converted into, by the exhaust cam lobes 42e steady statue opening and closing air bleeding valve 34 with normal timing, the state being opened and closed air bleeding valve 34 by variable cam salient angle 50e.

Air bleeding valve 34 is beaten opening/closing in the timing being different from normal exhaust timing and is performed in the overlapping regulation timing of timing of opening with inlet valve 33, and this of air bleeding valve 34 is opened so that the aerofluxus being retained in exhaust port returns to combustor 15z.

Swing arm 65 is arranged to make its longitudinal side be nearly parallel to cylinder axial direction (nearly vertical direction) and be constructed such that fulcrum P is positioned on the inverted cam sprocket wheel 36 being fixed on valve operation of cam axle 41, it means that the lever ratio that swing arm 65 can be big is placed in valve system 40 in a compact manner.

Additionally, in swing arm 65, impetus Q, fulcrum P and application point R linear configurations in order from the top to the bottom so that swing arm 65 can be readily assembled in the confined space of cam chain room 20c, and while the weight of swing arm 65 reduces, it is prevented that swing arm 65 receives twisting resistance. Further, since swing arm 65 has U-shaped cross section, the lighter in weight of swing arm 65, and provide rigidity, it is prevented that sagging. Therefore, it can accurate motion at any time, and the action of solenoid 61 is delivered to slide mechanism 52 so that variable cam component 50 moves, thus valve timing can steadily and exactly change, to efficiently perform EGR control.

Many ribs are arranged on the rear side of top cover 20, particularly divide the lower section of 21 at center knob. This guarantees the center knob 21 supporting solenoid 61 in cantilever fashion and the prominent rigidity of protruding 22, and the action of the plunger 61p of the solenoid 61 being fixed on prominent protruding 22 is accurately delivered to slide mechanism 52. Further, since swing arm 65 has big lever ratio, the desire motion amount of solenoid 61 is less, such that it is able to use less actuator. Further, since top cover 20 supports swinging axle, and forming entirety with paired guiding wall 23, its structure is less and simplify due to parts.

Figure 10 is the top view of cylinder cap 15. At the rear side of the roof 20u of top cover 20, the oil circuit 26 front portion on its longitudinal direction of car direction extends in the way of being positioned at left side. Oil circuit 26 has four spray-holes 27 being downwardly oriented. Equally, three dowel hole 15n make in the upper surface of cylinder cap 15, and align member 72 is installed in each dowel hole 15n.

When being placed on cylinder cap 15 by top cover 20, align member 72 is installed in the dowel hole 15n of top cover 20, in order to location, and flanged pin bolt 70 inserts via elastic component 71 and installs bolt hole 15b and fastened. Therefore, the top cover 20 align member 72 that is moved through on the direction being perpendicular to cylinder shaft line limits, and top cover 20 is by cylinder cap 15 elastic bearing, and thus absorption can affect the vibration of the operation of vario valve timing driving mechanism 60, and makes it can change valve timing exactly.

The dowel hole 15n of the oil circuit 26 on the rear side of contiguous cylinder cap 15 extends with from cylinder body 14 and the same oily feed lines 15a connection connected with oil circuit 26. Therefore, it is fed to oil circuit 26 from the oil of oil feed lines 15a supply via cylindrical align member 72.

As shown in the double dot dash line of Figure 10, oil circuit 26 is formed above air-breathing rocker arm 44i and exhaust rocker arm 44e, tilts to extend in a longitudinal direction. Four spray-holes 27 are positioned in oil circuit 26 so that oil sprays above air-breathing rocker arm 44i and exhaust rocker arm 44e, thus lubricating valve system 40.

Spline mounting portion due to the valve operation of cam axle 41 that the same lubrication of oil being sprayed at via the spray-hole 27 of oil circuit 26 on valve system 40 is slided by variable cam component 50, when variable cam component 50 is closer to steady statue cam member 42, the same gap invaded between them of oil. But, in this embodiment, swing arm 65 contact stops 24, and therefore prevent vibration, between variable cam component 50 and steady statue cam member 42, thus form gap so that variable cam component 50 and steady statue cam member 42 will not be difficult to be separated from each other due to the viscosity of oil.

It is sprayed at the oil in valve system 40 and the rotation etc. of the oil oscillating motion due to rocker arm 44i and 44e, the rotation along with valve operation of cam axle 41 and cam chain 37 that taken up by cam chain 37 is splashed. Therefore, the swinging axle of swing arm 65 is always by oil lubrication, and prevents the abrasion of position that swing arm 65 and sliding bar 53 abut against one another.

Figure 11 indicates that the block diagram of the structure of the exhaust gas recirculatioon controller of internal combustion engine according to the embodiment of the present invention. ECU100 as the control part of the exhaust gas recirculatioon controller as internal combustion engine receives the data coming from Ne (revolution as engine speed) sensor 102, Tw (temperature) sensor 103, TH (throttling arrangement aperture) sensor 104 and Pb (pressure of inspiration(Pi)) sensor 105. The crank pulse data of the bent axle 11 according to Ne sensor 102 detection and the output valve of Pb sensor 105, calculate internal combustion engine 10 location when bent axle 11 takes two turns (720 degree) by stroke identification (front/rear judgement). According to the data coming from sensor, ignition timing that ECU100 determines spark plug 19 and the fuel quantity etc. being ejected in fuel chambers. Tw sensor 103 is designed to detect the temperature of lubricating oil when internal combustion engine 100 is air-cooled engines, and detection cools down the temperature of water when internal combustion engine 10 is water-cooled engine.

In this embodiment, ECU100 storage clearly performs EGR operation scope mapping 101 (see Figure 13) of the EGR operating condition controlled. ECU100 is designed to map 101 inspections relative to EGR operation scope and comes from Ne sensor 102 and the data of TH sensor 104, and judges whether the current operational conditions of internal combustion engine 10 is suitable to EGR control.

Then, if ECU100 judges that operating condition is suitable to EGR control, ECU100 makes solenoid 61 magnetize, make variable cam component 50 adjoining exhaust rocker arm 44e (see Fig. 4), thus carrying out EGR control, on the other hand, if ECU100 judges that operating condition is unsuitable for EGR control, then ECU100 makes solenoid 61 degaussing so that variable cam component 50 is disengaged with exhaust rocker arm 44e, in order to turns off EGR and controls (being transformed into normal operating).

Figure 12 indicates that the curve chart of the timing activating air-breathing and air bleeding valve. The timing B (solid line) activating the inlet valve 33 and timing A (chain line) activating air bleeding valve 34 is determined by air inlet cam salient angle 42i and the exhaust cam lobes 42e (see Fig. 4) being respectively formed on steady statue cam member 42.

Typically for the valve timing of the air-breathing in four-stroke engine and air bleeding valve, air-breathing is opened time different with air bleeding valve, except the overlaid periodic in the prescribed limit in crank zero degree (exhaust top dead center). But, in the internal combustion engine 10 according to present embodiment, in order to perform EGR control some aerofluxuss are returned to combustor from exhaust port and makes it again burn, solenoid 61 is magnetized, air bleeding valve 34 makes variable cam component 50 adjoining exhaust rocker arm 44e, so that can be opened within the cycle that inlet valve 33 is opened.

More particularly, as shown in the dotted line (C) of accompanying drawing, open in the process of cycle T (crank angle ranges of such as 180 ° ± 90 °) at the valve from suction stroke to compression travel and open air bleeding valve 34 and perform EGR control by promoting with relatively small valve. Valve timing and valve lifting capacity in EGR control are determined by forming the variable cam salient angle 50e on variable cam component 50.

Figure 13 is that EGR operation scope maps 101. Although known EGR controls in the processes such as exhaust gas purification very effective, when internal combustion engine 10 is in predetermined operation condition and range, when operating condition is away from predetermined operation condition and range, it is preferably to turn off EGR and control. In the EGR operation scope mapped as 2D maps, EGR operation scope is determined by engine speed Ne and throttling arrangement aperture TH. EGR operation scope can such as be arranged with the scope of throttling arrangement aperture TH only small (aperture of such as 0-35%) and engine speed medium (such as 2750-4750rpm).

In this embodiment, by the upper left corner, there is the scope that the rectangle of triangular incision represents and be arranged to EGR operation scope D (solid line), wherein engine speed Ne is in the scope of Ne1-Ne2, and throttling arrangement aperture TH is in the scope of 0 (zero)-TH2. This triangular incision in this rectangle is used in scope TH1-TH2, increases for the EGR throttling arrangement aperture Th controlled in Ne1-Nea scope internal linear, according to the test that applicant carries out, it has been acknowledged that control by turning off the EGR within the scope of this triangle, electromotor output improves, and exhaust purifying capability improves.

Arrange in EGR operation scope D it addition, be used for cancelling the EGR delayed scope E (double dot dash line) that arranges controlled. Such as, if engine speed Ne reduces from Ne3, throttling arrangement aperture TH keeps THa simultaneously, then EGR controls to start when reaching the engine speed Ne2 determining EGR span of control D. On the other hand, if throttling arrangement aperture TH keeps THa, and engine speed Ne increases towards Ne2, and EGR controls to terminate when reaching more than Ne2 and determining the delayed Ne3 arranging scope E. This prevents solenoid 61 remagnetization and degaussing near the border of EGR operation scope D.

As it has been described above, ECU100 is constructed such that when the operating condition of internal combustion engine 10 is in EGR operation scope D, EGR controls to start, and when the operating condition of internal combustion engine 10 is in outside EGR operation scope D, EGR controls to terminate. But, if solenoid 61 activates when its entrance being detected or leaving EGR operation scope D at once, variable valve timing mechanism 60 can form Transform Acoustic.

More particularly, in order to terminate EGR control, variable cam component 50 slides, variable cam salient angle 50e is disengaged with exhaust rocker arm 44e, and now, if air bleeding valve 34 is stayed open by variable cam salient angle 50e, at variable cam salient angle 50e in the axial direction when pulled, air bleeding valve 34 quick closedown by the biasing force due to the valve spring (not shown) towards closedown direction bias air bleeding valve 34.Therefore, when valve contact portion (valve seat) Rapid contact each other of the rain umbrella-shaped portion (valve face) of air bleeding valve 34 and exhaust port 15e, collision sound can be formed.

For this, this embodiment is designed such that the operating condition of air bleeding valve 34 exports according to crank pulse and Pb sensor and detects, and when terminating EGR and controlling, if air bleeding valve 34 is stayed open by variable cam component 50, after waiting until that air bleeding valve 34 completely closes, solenoid 61 is by degaussing so that variable cam salient angle 50e slides. Therefore, when terminating EGR and controlling, do not produce collision sound when air bleeding valve 34 contacts valve seat. This embodiment is also devised to so that when starting EGR and controlling, the valve opened by variable cam component 50 at air bleeding valve 34 is opened in cycle T, and solenoid 61 waits until the back magnetization that air bleeding valve 34 completely closes.

Internal combustion engine 10 according to this embodiment is designed such that the ECU100 performing fuel injection control performs fuel cut-off control, thus stopping fuel injection in the regulation process such as car speed and above speed reduction. This fuel cut-off controls to be designed in regulation engine speed range and stops fuel injection, for instance under regulation car speed and above speed, when throttling arrangement aperture TH is arranged to completely closed state.

Assuming that electromotor is owing to throttling arrangement closedown, engine braking are from high deceleration, the lapse of time after closing along with throttling arrangement increases, and car speed and engine speed all reduce. But, when speed is reduced to regulation low-speed range, fuel injection must start over to avoid engine misses, even if throttling arrangement aperture is in completely closed state. But, if normal injection restarts when reaching given engine speed, engine power can change, and affects cornering ability. Therefore, this embodiment is designed such that when in moderating process, fuel cut-off re-starts after controlling spraying fire, and engine power change when again spraying is gradually reduced control reduces by performing the fuel cut-off speed that wherein fuel cut-off speed is gradually reduced.

This embodiment is characterised by that fuel is injected in the engine speed started after fuel cut-off control and is configured to the level lower than the minimum engine speed of EGR operation scope D. Specifically, with reference to Figure 13, the engine speed NeL (such as 2000rpm) controlled when terminating by the fuel cut-off in the moderating process of closedown throttling arrangement is configured to the level lower than the minimum engine speed Ne1 (such as 2750rpm) of EGR operation scope D. It addition, start the engine speed NeH (such as 2200rpm) when fuel cut-off speed is gradually reduced control to be similarly arranged to the minimum level low for engine speed Ne1 than EGR operation scope D.

Described setting prevents from carrying out the conversion while fuel injection between EGR operation scope and EGR not operation scope in moderating process. If EGR not operation scope converts EGR operation scope to while such as carrying out fuel injection in moderating process, burning condition can control to become better due to EGR, causes the improvement that electromotor exports. This (this can affect cornering ability) can improve electromotor output in the moderating process passing through closedown throttling arrangement. On the other hand, according to arrangement above, the conversion of EGR operation scope D carries out in the fuel cut-off control process when not carrying out fuel injection, it means that EGR controls to turn on and off when not affecting electromotor output.

Figure 14 indicates that the flow chart that the cam-operated solenoid of EGR controls. This flowchart representation EGR cam 50 (variable cam component) is by the ECU100 order controlled. Detected by TH sensor 104 in step S1, throttling arrangement aperture TH, and detected by Ne sensor 102 in step S2, engine speed Ne.

In step S3, in ECU100, search EGR operation scope map 101. In step S4, it is judged that whether throttling arrangement aperture TH is in prescribed limit, and if it is determined that be affirmative, then process proceeds to step S5 to judge that engine speed Ne is whether in prescribed limit. If the judgement of step S5 is affirmative, then process proceeds to step S6, in order to judge engine temperature Tw whether setting or more than. Therefore, in this embodiment, engine temperature Tw and throttling arrangement aperture TH and engine speed Ne considers as EGR control entry condition.

If the judgement of step S6 is affirmative, then think and meet EGR operation condition, and process proceeds to step S7, arranges the cam-operated condition identity F1=1 of EGR. On the other hand, if step S4, S5 or S6 judge whether fixed, then think and be unsatisfactory for EGR operation condition, and process proceeds to step S8, the cam-operated condition identity F=0 of EGR is set.

Then in step S9, export according to crank pulse and Pb sensor and judge that it is whether in the air bleeding valve opereating specification of variable cam component operation. This judgement determines whether the current phase place of bent axle 11 is opened in the scope (namely cycle T opened by valve) of air bleeding valve 34 at the variable cam salient angle 50e of variable cam component 50.

If the judgement of step S9 is affirmative, if namely EGR controls carrying out and judging that air bleeding valve 34 is stayed open by variable cam component 50, process proceeds to step S10, in order to judge that it is whether outside air bleeding valve is by the opereating specification (cycle T opened by valve) of variable cam component. If judging whether of step S10 is fixed, process proceeds to step S11, in order to waits and returns to step S9.

If the judgement of step S10 is affirmative, if namely EGR controls carrying out and judging that air bleeding valve 34 is over by the operation of variable cam component 50 along with air bleeding valve 34 and completely closes (if EGR controls do not carrying out, air bleeding valve should completely close), process proceeds to step S12.

In step S12, it is judged that whether the cam-operated condition identity F of EGR that step S7 is arranged is 1. If the judgement of step S12 is affirmative, then process proceeds to step S13, in order to connect solenoid 61, to start EGR control, and finishing control process. On the other hand, if judging whether of step S12 is fixed, then process proceeds to step S14, in order to turn off solenoid 61, terminate EGR and control, and finishing control process.

Figure 15 indicates that the flow chart of the order of the fuel cut-off control in moderating process. Accompanying drawing labelling in this flow chart is corresponding to the accompanying drawing labelling in the EGR operation scope mapping shown in Figure 13. In step S20, map (not shown) according to the fuel cut-off being stored in ECU100 and judge whether to meet fuel cut condition. Such as, fuel cut condition parameter can be car speed V, engine speed Ne and throttling arrangement aperture TH.

In step S21, it is judged that whether fuel cut-off carries out, and then in step S22, it is judged that whether throttling arrangement completely closes.If the judgement of step S20, S21 and S22 is affirmative, then process proceeds to step S23, in order to judge engine speed Ne whether more than setting NeH (such as 2200rpm) or more than. If the judgement of step S23 is affirmative, then process proceeds to S24, in order to judge engine temperature Tw be whether setting TwL (such as 40 degree) or more than.

If judging whether of step 23 is fixed, namely if it is determined that engine speed Ne is in the low-speed range of regulation, then process proceeds to step S25. If judging whether of same step S24 is fixed, namely if it is determined that engine temperature Tw is in regulation low temperature range, then process proceeds to step S25. On the other hand, if the judgement of step S24 is affirmative, namely if it is determined that engine temperature Tw is in regulation high temperature range, then finishing control process.

In step S25, it is judged that whether engine speed Ne exceedes relatively low setting NeL (such as 2000rpm). If the judgement of step S25 is affirmative, process proceeds to step S26, in order to starts fuel cut-off speed and is gradually reduced control, and in step S27 so that fuel cut-off speed is gradually reduced control counting to be increased. Fuel cut-off speed is gradually reduced control counter and can be coupled in ECU100.

In step S28, judge that fuel cut-off speed is gradually reduced whether control counter reaches setting, and if it is determined that be affirmative, process proceeds to step S29, to terminate fuel cut-off control (re-starting fuel injection control), and if it is determined that be negative, control process terminates. If judging whether of step S25 is fixed, process proceeds to step S29, terminates to force fuel cut-off to control, and finishing control process. Being controlled by described fuel cut-off, fuel cut-off speed is gradually reduced from fuel cut-off controlled state, thus the change of electromotor output (when re-starting fuel injection) when suppressing fuel again to spray so that cornering ability improves.

The motor speed set point values etc. that the structure of variable valve timing mechanism, EGR operation scope mapping settings, end fuel cut-off control is not limited to embodiment above, and can adjust in many ways. The exhaust gas recirculatioon controller of the internal combustion engine according to the present invention can be applied not only to motorcycle, and can apply to other multiple vehicles, for instance sidecar formula three-wheel/four-wheel car and general purpose engine etc.

Therefore the present invention is described, it will be appreciated that the present invention can modification in many ways. This modification is not to be regarded as a departure from the spirit and scope of the invention, and all these remodeling that one of ordinary skill in the art will appreciate that are all contained in scope of the claims.

Claims

1. the exhaust gas recirculatioon controller of an internal combustion engine, for performing EGR control, will pass through the operation in the actuator (61) stroke outside instroke, open the air bleeding valve (34) of internal combustion engine (10), some aerofluxuss are returned to combustor (15z) and makes it again burn;

Control part (100), be used for using at least engine speed (Ne) and throttling arrangement aperture (TH) as parameter to control described actuator (61) according to EGR operation scope mapping (101);

The described fuel injection controlling part (100) fuel shutoff spraying system in vehicle (1) moderating process when meeting fuel cut condition;

Fuel cut condition is mapped by the fuel cut-off determined by car speed (V), engine speed (Ne) and throttling arrangement aperture (TH) to be determined, if and be configured to described engine speed (Ne) relatively low setting (NeL) below time, terminate fuel injection to cut off, and re-start fuel injection;And

The minimum (Nel) of the engine speed (Ne) constituting the EGR operation scope (D) of EGR operation scope mapping (101) is configured to the value higher than the relatively low setting (NeL) of fuel cut condition;

The exhaust gas recirculatioon controller of described internal combustion engine is characterised by:

Wherein EGR control be operated by described actuator (61) in case described air bleeding valve (34) according to and valve operation of cam axle (41) synchronous axial system variable cam component (50) cam contour activate state and described air bleeding valve (34) do not carry out changing between the state activated turning on and off according to the cam contour of described cam member (50);

Described actuator (61) enables to be attached to the variable cam component (50) of described valve operation of cam axle (41) and slides, in order to can slide axially and mode does not operate described air bleeding valve (34) in relative rotation;

The described actuator (61) that described EGR controls by described variable cam component (50) of sliding makes it with described air bleeding valve (34) engagement or disengagement turns on and off; And

When described EGR controls to turn off, described air bleeding valve (34) is by being fixed to exhaust cam lobes (42e) operation that described valve operation of cam axle (41) is upper and engages with exhaust rocker arm (44e), when described EGR controls to connect, described air bleeding valve (34) is operated by described variable cam component (50) and both the exhaust cam lobes (42e) engaged with described exhaust rocker arm (44e).

2. the exhaust gas recirculatioon controller of internal combustion engine according to claim 1, wherein, it is gradually lowered between minimum (Nel) and the relatively low setting (NeL) of described fuel cut condition that the higher setting (NeH) controlling to be gradually reduced the timing of fuel cut-off speed is arranged in the engine speed (Ne) constituting described EGR operation scope (D) as starting fluid cut-off velocity.

3. the exhaust gas recirculatioon controller of internal combustion engine according to claim 1, wherein, it is gradually reduced between minimum (Nel) and the relatively low setting (NeL) of described fuel cut condition that the higher setting (NeH) controlling to be gradually reduced the timing of fuel cut-off speed is arranged in the engine speed (Ne) constituting described EGR operation scope (D) as starting fluid cut-off velocity.

4. the exhaust gas recirculatioon controller of internal combustion engine according to claim 2, wherein, the difference between described higher setting (NeH) and described minimum (Nel) is more than the difference between described relatively low setting (NeL) and described higher setting (NeH).

5. the exhaust gas recirculatioon controller of internal combustion engine according to claim 2, wherein, the described part (100) that controls starts enumerator when the described fuel cut-off speed of startup is gradually reduced control, and when described enumerator reaches setting, described control part (100) is terminated described fuel cut-off speed and is gradually reduced control and fuel cut-off, in order to re-start fuel injection.

6. the exhaust gas recirculatioon controller of internal combustion engine according to claim 1, wherein, described EGR operation scope maps (101) and maps restriction by including the 2D of described engine speed (Ne) and throttling arrangement aperture (TH); And

Described EGR operation scope (D) is by being arranged in by the almost triangle prescribed limit described engine speed (Ne) from which with low engine speed (Ne) and high throttling arrangement aperture (TH) in prescribed limit (Nel-Ne2) and described throttling arrangement aperture (TH) is positioned at the rectangle eliminating of prescribed limit (0-TH2) and constitutes.

7. the exhaust gas recirculatioon controller of internal combustion engine according to claim 1, wherein, described EGR operation scope maps (101) and maps restriction by including the 2D of described engine speed (Ne) and throttling arrangement aperture (TH);And

8. the exhaust gas recirculatioon controller of internal combustion engine according to claim 2, wherein, described EGR operation scope maps (101) and maps restriction by including the 2D of described engine speed (Ne) and throttling arrangement aperture (TH); And

9. the exhaust gas recirculatioon controller of internal combustion engine according to claim 1, wherein, described fuel cut condition includes described throttling arrangement aperture (TH) and is fully closed.

10. the exhaust gas recirculatioon controller of internal combustion engine according to claim 2, wherein, described fuel cut condition includes described throttling arrangement aperture (TH) and is fully closed.

11. the exhaust gas recirculatioon controller of internal combustion engine according to claim 1, wherein, described EGR operation scope mapping (101) includes arranging the delayed of hysteresis characteristic for described EGR operation scope (D) and arranges scope (E).

12. the exhaust gas recirculatioon controller of internal combustion engine according to claim 2, wherein, described EGR operation scope mapping (101) includes arranging the delayed of hysteresis characteristic for described EGR operation scope (D) and arranges scope (E).

13. the exhaust gas recirculatioon controller of an internal combustion engine, for performing EGR control, will pass through the operation in the actuator (61) stroke outside instroke, open the air bleeding valve (34) of described internal combustion engine (10), some aerofluxuss are returned to combustor (15z) and makes it again burn

Control part (100) is set, is used for using at least engine speed (Ne) and throttling arrangement aperture (TH) to map (101) as parameter according to EGR operation scope and controls described actuator (61);

When the operating condition of described internal combustion engine (10) maps in the EGR operation scope (D) of (101) in described EGR operation scope, the described part (100) that controls activates described air bleeding valve (34) to perform EGR control according to the cam contour of described variable cam component (50), and open described variable cam component (50) in the operating condition of described internal combustion engine (10) described air bleeding valve (34) cycle (T) process in outside described EGR operation scope (D) time, the described part (100) that controls waits, terminate until valve opens the cycle (T), and described air bleeding valve (34) is fully closed, then pass through the state that the cam contour being transformed into according to described variable cam component (50) does not perform the actuating of described air bleeding valve (34), turn off described EGR to control.

14. the exhaust gas recirculatioon controller of internal combustion engine according to claim 13, wherein, described actuator (61) enables to be attached to the variable cam component (50) of described valve operation of cam axle (41) and slides, in order to can slide axially and mode does not operate described air bleeding valve (34) in relative rotation;

When described EGR controls to turn off, described air bleeding valve (34) is by being fixed to exhaust cam lobes (42e) operation that described valve operation of cam axle (41) is upper and engages with exhaust rocker arm (44e), when described EGR controls to connect, described air bleeding valve (34) is operated by described variable cam component (50) and both the exhaust cam lobes (42e) engaged with described exhaust rocker arm (44e); And

When the operating condition of described internal combustion engine (10) maps in the EGR operation scope (D) of (101) in described EGR operation scope, the described part (100) that controls makes described variable cam component (50) engage with described exhaust rocker arm (44e), to perform EGR control, and open described variable cam component (50) in the operating condition of described internal combustion engine (10) described air bleeding valve (34) cycle (T) process in outside described EGR operation scope (D) time, the described part (100) that controls waits, terminate until valve opens the cycle (T), and described air bleeding valve (34) is fully closed, then pass through and turn off described EGR control so that described variable cam component (50) is disengaged.

15. the exhaust gas recirculatioon controller of internal combustion engine according to claim 13, wherein, when the operating condition of described internal combustion engine (10) is outside described EGR operation scope (D) and simultaneously not within the cycle (T) that described variable cam component (50) opens described air bleeding valve (34), the described part (100) that controls makes described variable cam component (50) be disengaged, without waiting for.

16. the exhaust gas recirculatioon controller of internal combustion engine according to claim 13, wherein, described internal combustion engine (10) operating condition described variable cam component (50) open described air bleeding valve (34) cycle (T) process in enter described EGR operation scope map (101) EGR operation scope (D) time, the described part (100) that controls waits, terminate until valve opens the cycle (T), and described air bleeding valve (34) is fully closed, then engage described variable cam component (50).

17. the exhaust gas recirculatioon controller of internal combustion engine according to claim 13, wherein, whether the operating condition of described internal combustion engine (10) is detected by least crank pulse data of described internal combustion engine (10) within the cycle (T) that described variable cam component (50) opens described air bleeding valve (34).

18. the exhaust gas recirculatioon controller of internal combustion engine according to claim 13, wherein, described EGR operation scope maps (101) and is included as described EGR operation scope (D) and arranges the delayed of hysteresis characteristic and arrange scope (E).

19. the exhaust gas recirculatioon controller of internal combustion engine according to claim 13, wherein, described EGR operation scope maps (101) and maps restriction by including the 2D of described engine speed (Ne) and throttling arrangement aperture (TH); And

Described EGR operation scope (D) is by being arranged in have the almost triangle prescribed limit of low engine speed (Ne) and high throttling arrangement aperture (TH) in prescribed limit (Nel-Ne2) from described engine speed (Ne) and described throttling arrangement aperture (TH) is positioned at the rectangle eliminating of prescribed limit (0-TH2) and constitutes.

20. the exhaust gas recirculatioon controller of internal combustion engine according to claim 13, wherein, the plunger (61p) as the operation axle of described actuator (61) is parallel to described valve operation of cam axle (41) location;

Described variable cam component (50) by helical spring (56) towards the direction constant bias being disengaged with described air bleeding valve (34);

The sliding motion of described plunger (61p) is delivered to described variable cam component (50) via the swing arm (65) passing through pivoting bolt (64) the swingable axle journal supporting vertically-oriented relative to described plunger (61p) and described valve operation of cam axle (41); And

When described actuator (61) magnetizes, described variable cam component (50) is resisted the biasing force of described helical spring (56) and is slided, and described variable cam component (50) engages described exhaust rocker arm (44e), and on the other hand, when described actuator (61) degaussing, variable cam component (50) and exhaust rocker arm (44e) are disengaged again by the biasing force of described helical spring (56).