CN1534171A - Variator air valve device for IC engine - Google Patents
Variator air valve device for IC engine Download PDFInfo
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- CN1534171A CN1534171A CNA2004100066471A CN200410006647A CN1534171A CN 1534171 A CN1534171 A CN 1534171A CN A2004100066471 A CNA2004100066471 A CN A2004100066471A CN 200410006647 A CN200410006647 A CN 200410006647A CN 1534171 A CN1534171 A CN 1534171A
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Abstract
An inlet valve side and an exhaust valve side are respectively provided with a valve timing change mechanism (VTC) actuated by oil pressure from the oil pump for changing a valve lift characteristic. When an oil temperature Ot detected by an oil temperature sensor becomes higher than a predetermined second oil temperature threshold Ot2 (S15a), actuation of the exhaust VTC is prohibited (S16a). When the oil temperature Ot exceeds a first oil temperature threshold Ot1 which is higher than the Ot2, actuation of the inlet VTC is prohibited.
Description
Technical field
The present invention relates to a kind of variable valve gear that on the both sides of air inlet side and exhaust side, is provided with by the internal-combustion engine of the variable valve actuator for air of oil pressure actuated.
Background technique
For the output that improves internal-combustion engine with improve the fuel consumption performance, the past proposes to have the various variable valve actuator for air of the valve lift properties that can change inlet and exhaust valve.For example, disclose and used the variable valve actuator for air of hydraulic type actuator and electrodynamic type actuator in the patent documentation 1.
(patent documentation 1)
TOHKEMY 2002-161721 communique
For being provided with respectively air inlet side and exhaust side both sides, there is following problem by from the oil pressure actuated of oil pressure source such as oil pump and change the occasion of the variable valve actuator for air of valve lift properties.Under the situation of low fuel pressure (oil temperature high), the action response in order to ensure both sides' variable valve actuator for air causes the high capacity of oil pump to maximize, and causes the increase of cost and the maximization of device.Perhaps, when the variable valve actuator for air with at least one side forms electrodynamic type, still cause the increase of cost, simultaneously, electric power consumption increases, can not fully obtain the original purpose of the conduct that brings by variable valve actuator for air fuel consumption improve effect.
Summary of the invention
The present invention makes in view of such problem, its main purpose is to provide a kind of variable valve gear of novel internal-combustion engine, and the variable device of air of this internal-combustion engine is suitable for the variable valve actuator for air that is changed valve lift properties by oil pressure actuated respectively in air inlet side and exhaust side; In the variable valve gear of this internal-combustion engine, can avoid because rising of the decline of oil pressure oil temperature etc. and can not guarantee the action response of variable valve actuator for air simultaneously, can improve fuel consumption etc. by the miniaturization small capacity realization cost degradation of oil pressure source such as oil pump.
Be provided with respectively by from the oil pressure actuated of oil pressure source and change the variable valve actuator for air of valve lift properties at air inlet side and exhaust side.Detect the oil pressure parameter relevant,, forbid at least one side's of air inlet side variable valve actuator for air and exhaust side variable valve mechanism action according to this oil pressure parameter with oil pressure.
According to the present invention, owing to the action of forbidding at least one side's variable valve actuator for air according to this oil pressure parameter, so, can not make oil pressure source maximization high capacities such as oil pump, can avoid making unintentionally the action response reduction of variable valve actuator for air.Therefore, do not make reliability decrease, can realize making oil pressure source miniaturization small capacityization, realize cost degradation fuel consumption improvement etc.
Description of drawings
Fig. 1 is the signal pie graph that the variable valve gear of internal-combustion engine of the present invention is shown.
Fig. 2 is illustrated in the oil hydraulic circuit figure that oil hydraulic circuit is provided with the example of oil temperature sensor.
Fig. 3 is the flow chart that the flow process of the setting processing that allows switching mark is shown.
Fig. 4 is the flow chart that the control flow of the present invention's the 1st form of implementation is shown.
Fig. 5 is the flow chart that the control flow of the present invention's the 2nd form of implementation is shown.
Fig. 6 is illustrated in the oil hydraulic circuit figure that oil hydraulic circuit is provided with the example of oil pressure sensor.
Fig. 7 is the flow chart that the control flow of the present invention's the 3rd form of implementation is shown.
Fig. 8 is the flow chart that the control flow of the present invention's the 4th form of implementation is shown.
Fig. 9 is the explanatory drawing of action effect that is used to illustrate the occasion of the action of only forbidding exhaust VTC.
Figure 10 is the flow chart that the control flow of the present invention's the 5th form of implementation is shown.
Figure 11 is the flow chart that the control flow of the present invention's the 6th form of implementation is shown.
Embodiment
Describe the preferred embodiment of the present invention below with reference to the accompanying drawings in detail.In Fig. 1, air inlet side Variable Valve Time gear (to call air inlet VTC in the following text) 13 as air inlet side variable valve actuator for air changes the valve timing of intake valve serially, changes the valve timing of exhaust valve serially as the exhaust side variable valve timing mechanism (to call exhaust VTC in the following text) 15 of exhaust side variable valve mechanism.These VTC (valve timing control) self carry out simple explanation here as being known technology at above-mentioned TOHKEMY 2002-161721 communique disclosed.
Each VTC has and is fixed in the shell 43 of the rotating linkedly cam sprocket wheel 47 of bent axle and is contained in this shell 43 and is fixed in the blade 44 of admission cam shaft 14 or exhaust cam shaft 16.Liquid thickly surrounds and is connected to 2 VTC oil supply galleries 34 or 35 (in the air inlet side is 34a, 34b between blade 44 and shell 43; At exhaust side is 35a, 35b) the hydraulic chamber 45,46 of 2 systems.Corresponding with the oil pressure that supplies to these hydraulic chamber 45,46,43 revolutions of blade 44 opposite shell, the phase change of the relative crankshaft of phase place of admission cam shaft 14,16, the phase change of the operating angle of inlet and exhaust valve is to the side of side delay in advance.
Control unit of engine 1 is the known digital computer that has CPU, ROM, RAM, reaches input/output interface, stores and implement the such various control processing of aftermentioned as described later like that.Promptly, control unit of engine 1 is according to expression water temperature signal 2, suck air quantity signal 3, throttle sensor signal 4, oxygen sensor signal 5, motor revolution signal 6, intake cam angle transducer signal 19, and the testing signal of exhaust cam angle transducer signal 20 running statees such as vehicle such as grade is to various actuators output control signals, particularly to exporting air inlet VTC control signal 9 and exhaust VTC control signal 10 as command value (energising amount) respectively as the air inlet VTC solenoid 11 of air inlet side pressure control valve with as the exhaust VTC solenoid 12 of exhaust side pressure control valve.VTC solenoid 11,12 is corresponding to the connection state and the aperture of command value control VTC oil supply gallery 34,35, and control is to the supply oil pressure of hydraulic chamber 45,46.
Fig. 2,6 illustrates VTC13,15 oil hydraulic circuit briefly.Be provided as the oil pump 31 of oil pressure source in cylinder block 41.Via cylinder block main oil gallery 32, VTC solenoid oil supply gallery 33, above-mentioned VTC solenoid 11,12, and VTC oil supply gallery 34,35, supply to the VTC13,15 that is located at cylinder head 42 by the working oil (lubricant oil engine oil) after oil pump 31 pressurization.
In the 1st, 2,5 embodiments described later, as shown in Figure 2, from oil pump 31 to the way of the oil pressure feed path of VTC solenoid 11,12, for example be provided with and detect as the i.e. oil temperature sensor (oil pressure parameter detecting unit) 24 of oil temperature of the temperature of the working oil of the hydraulic parameter related with oil pressure at cylinder block main oil gallery 32.In the 3rd, 4,6 embodiments described later, as shown in Figure 6, from oil pump 31 to the way of the oil pressure feed path of VTC solenoid 11,12, for example the pressure that testing oil is set at VTC solenoid oil supply gallery 33 is the oil pressure sensor (oil pressure parameter detecting unit) 22 of oil pressure.
Fig. 3～5,7,8,10,11 are for illustrating the flow chart that is carried out the control processing of storage implementation by control unit of engine 1.As shown in Figure 3, in S (step) 1, air inlet VTC switching permission flag Vi and exhaust VTC switching permission flag Ve are initialized to 0.At S2, mainly take a decision as to whether the working zone (ON zone) that at least one side that oil pressure is supplied to the hydraulic chamber 45,46 of air inlet VTC13 makes air inlet VTC13 start according to internal-combustion engine rotational speed and engine load.Occasion in the working zone that is judged to be air inlet VTC13 advances to S3, establishes air inlet VTC and switches permission flag V
iBe 1.Judging be not the occasion of carrying out the working zone of VTC13, bypass S3, V
iRemain 0.Equally, in S4, mainly judge whether that according to internal-combustion engine rotational speed and engine load at least one side for the hydraulic chamber 45,46 that oil pressure supplied to exhaust VTC15 makes the working zone (ON zone) of exhaust VTC15 action.Occasion in the working zone that is judged to be air inlet VTC13 advances to S5, exhaust VTC is switched permission flag Ve be made as 1.Judging be not the occasion of the working zone of exhaust VTC15, bypass S5, Ve remains 0.
In the S2 and S4 of this Fig. 3, take a decision as to whether main basis and oil pressure is supplied to VTC, makes the zone of VTC action based on the requirement of internal-combustion engine rotational speed and engine load, do not consider the influence of the decline of the rising of the oil temperature among the embodiment described later and oil pressure.
Fig. 4 is the flow chart that the present invention the 1st embodiment's control flow is shown.In S11, read in air inlet VTC by the program setting of Fig. 3 and switch the value that permission flag Vi and exhaust VTC switch permission flag Ve.In S12, judge that air inlet VTC switches whether permission flag Vi is 1.At S13, judge that whether exhaust VTC switches permission flag Ve is 1.As long as for judging that Vi and Ve both sides are 1 occasion, that is, for the working zone of air inlet VTC13 and be the working zone of exhaust VTC15, then carry out the later processing of S14, at this occasion in addition, termination routine.
In S14, read in the output value Ot (the oil temperature sensor signal 23 of Fig. 1) of oil temperature 24 shown in Figure 2.In S15, judge whether output value (oil temperature) Ot is the 1st high oily temperature state that surpasses the 1st predetermined oily temperature threshold value Ot1 (for example 120～130 ℃).Occasion being judged to be the 1st high temperature temperature state advances to S16, and the value of establishing air inlet VTC switching permission flag Vi is 0, and simultaneously, the value of establishing exhaust VTC switching permission flag Ve is 0.That is, forbid the action of air inlet VTC13, simultaneously, forbid the action of exhaust VTC15.
According to the 1st embodiment, under the 1st high oily temperature state of oil temperature height, the decline of work oil viscosity, oil pressure step-down, the action of forbidding air inlet VTC13 and exhaust VTC15 both sides is the supply of oil pressure.Therefore,, the capacity of oil pump 31 is not guaranteed too muchly, can be avoided the action response of VTC to descend unintentionally in order to guarantee the action response of VTC, and by the miniaturization of the reduction device of the miniaturization small capacity realization cost of oil pump 31 and reduction of friction etc.
Fig. 5 is the flow chart that the present invention the 2nd embodiment's control flow is shown.The 1st embodiment of the processing of S11～S14 and Fig. 4 is same.In S15a, output value (oil temperature) Ot that judges oil temperature 24 is for surpassing the 2nd high oily temperature state of the 2nd predetermined oily temperature threshold value Ot2.Occasion being judged to be the 2nd high oily temperature state advances to S16a, and the value of exhaust VTC being switched permission flag Ve is made as 0.That is, do not forbid the action of air inlet VTC13, only forbid the action of exhaust VTC15.
Below, the 2nd embodiment's action effect is described with reference to Fig. 9.
(1) for example at regional area, make intake valve open moment IVO in advance by air inlet VTC13, the overlapping till the moment EVO is opened in increase from IVO to the exhaust valve, thereby increases the improvement of internal EGR amount, realization fuel consumption.
(2) at low-speed region etc., make IC Intake Valve Closes constantly IVC advance, make this IVC near lower dead center, thereby improve actual compression ratio, realize the raising of torque.
(3) according to the pulsation of the exhaust in exhaust passage (outlet pipe), when row pressure is low combustion gas then waste gas be easy to discharge, so, in the standard-sized sheet zone, EVC is postponed, promote the discharge of waste gas, improve output.
Therefore, as the 2nd embodiment, only forbid the action of exhaust VTC15 at the 2nd high oily temperature state (during failure), thereby above-mentioned (1), the effect of (2) that the action of guaranteeing air inlet VTC13 produces, and, same with the 1st embodiment, can alleviating by the reduction friction of the miniaturization small capacity realization cost of oil pump 31.
When high oil was warm, in order to forbid the action of exhaust VTC15, the output that can not obtain above-mentioned (3) improved effect.Yet when so high oil was warm, it was low to realize exporting the necessity that increases, no problem in the practicality.
As shown in Figure 9, relatively (B) make air inlet VTC13 in advance, the occasion of valve overlap and the occasion that (C) makes exhaust VTC15 postpone, be provided with valve overlap are set as can be known, in (B), mainly obtain EGR in budc, so, be easy to EGR be discharged along with piston rises, in (C), mainly After Top Center obtain EGR, so, be easy to along with general who has surrendered EGR under the piston is pulled in the cylinder.
In VTC, be input to the operating lag that is accompanied by before carrying out actual act to a certain degree from signal by oil pressure actuated.For this reason, for example, when keeping the state of (C), be easy to EGR is pulled in the cylinder, so it is unstable that burning is easy to become in the transitional period of stepping on the state (A) of bringing to a halt, transfer to idling zone etc. from (B) or operation area (C).And under the state of (B), it is more stable to burn.Therefore, as the 2nd embodiment, by only forbidding the action of exhaust VTC when the high oil temperature, thereby can suppress the valve overlap of avoiding (C) such.
In addition, by the above-mentioned the 2nd oily temperature threshold value Ot2 being set lower, thereby the operating space of VTC can be enlarged, the raising of maneuverability can be realized than the 1st embodiment's the 1st oily temperature threshold value Ot1.
Fig. 7 is the flow chart that the control flow of the present invention's the 3rd form of implementation is shown.The 1st embodiment of the processing of S11～S14 and above-mentioned Fig. 4 is same.In S15b, the output (the oil pressure sensor signal 21 of Fig. 1) of judging oil pressure sensor 22 shown in Figure 6 is whether oil pressure Op is than the 1st predetermined oil pressure threshold value (the 1st low low oil pressure state of 100～150Pa) Op1 for example.Occasion being judged to be the 1st low oil pressure state advances to S16b, and the value of air inlet VTC switching permission flag Vi and the value of exhaust VTC switching permission flag Ve are made as 0.Like this, forbid the action of air inlet VTC13, simultaneously, forbid the action of exhaust VTC15.
Air inlet VTC and exhaust VTC be by oil pressure actuated, and in the occasion of low fuel pressure, its performance characteristic worsens (responsiveness is slack-off etc.).Characteristic with oil pressure decline that the high then decline of viscosity causes as the oil temperature, so, in above-mentioned the 1st, the 2nd embodiment, the characteristic that substitutes as oil pressure, the oil temperature of the oil temperature sensor that will generally use in existing motor realizes the minimizing cost degradation of number of components etc. as the parameter relevant with oil pressure.And in the 3rd embodiment, owing to directly detect the oil temperature that oil pressure substitutes characteristic, so the control accuracy of air inlet VTC and exhaust VTC is good.
Fig. 8 is the flow chart that the control flow of the present invention's the 4th form of implementation is shown.The processing of S11～S14 is identical with the 1st embodiment of above-mentioned Fig. 4.In S15c, judge whether output (oil pressure) Op of oil pressure sensor 22 is than predetermined the 2nd low low oil pressure state of the 2nd oil pressure threshold value Op2.Occasion being judged to be the 2nd low oil pressure state advances to S16c, does not change air inlet VTc and switches permission flag Vi, and the value of only exhaust VTC being switched permission flag Ve is made as 0.Like this, do not forbid the action of air inlet VTC13, only forbid the action of exhaust VTC15.
According to the 4th such embodiment, can obtain above-mentioned the 2nd embodiment and the 3rd embodiment's main action effect in the lump.That is, by only forbidding the action of exhaust VTC, can expand the working zone of the air inlet VTC relevant with oil pressure to the limit, maneuverability improves, and compares with the occasion of the action of only forbidding air inlet VTC, and combustion stability improves.In addition, owing to can directly detect oil pressure, so, same with the 3rd embodiment, can improve control accuracy.In addition, by the 2nd oil pressure threshold value Op being set, thereby can enlarge the working zone of VTC, improve maneuverability than the 3rd embodiment's the 1st oil pressure threshold value Op1 height.
Figure 10 is the flow chart that the control flow of the present invention's the 5th form of implementation is shown.The 2nd embodiment of the processing of S11～S16a and Fig. 5 is same.That is, by oil temperature sensor 24 detected oil temperature Ot than the 2nd high high oily temperature state of the 2nd oily temperature threshold value Ot2 under, advance to S16a from S15a, exhaust VTC is switched permission flag Ve is made as 0, forbid the action of exhaust VTC15.At ensuing S17, judge that oily temperature Ot surpasses the 1st oily temperature threshold value Ot1 as the value higher than the above-mentioned the 2nd oily temperature threshold value Ot2 (the 1st high oily temperature state of Ot1＞Ot2).When being judged to be the 1st high oily temperature state, advance to S18, establishing air inlet VTC, to switch permission flag Vi be 0, forbids the action of air inlet VTC13.
According to the 5th embodiment, can obtain the effect identical substantially with the 2nd embodiment, in addition, the action of exhaust VTC15 is forbidden forbidding suitably carrying out by this order successively corresponding to the rising of oil temperature with the action of air inlet VTC13, can positively avoid the status of fail such as reduction unintentionally of the action response of VTC, fully guarantee the working zone of VTC, improve internal combustion engine operation.
Figure 11 is the flow chart that the control flow of the present invention's the 6th form of implementation is shown.The 4th embodiment of the processing of S11～S16c and Fig. 8 is same.That is, by oil pressure sensor 22 detected oil pressure Op than the 2nd low low oil pressure state of the 2nd oil pressure threshold value Op2 under, advance to S16c from S15c, exhaust VTC is switched permission flag Ve is made as 0, forbid the action of exhaust VTC15.In ensuing S17a, take a decision as to whether oil pressure Op and liken the 1st oil pressure threshold value Op1 for the value that is lower than above-mentioned the 2nd oil pressure threshold value Op2 (the 1st low oil pressure state that Op1＜Op2) is lower to.When being judged to be the 1st low oil pressure state, advance to S18, air inlet VTC is switched permission flag Vi be made as 0, forbid the action of air inlet VTC13.
According to the 6th embodiment, can obtain the effect same substantially with the 4th embodiment, in addition, the action of exhaust VTC15 is forbidden forbidding being undertaken by this sequential stages ground corresponding to the decline of oil pressure with the action of air inlet VTC13, so, can positively avoid the failure (action response decline) of VTC, enlarge the working zone of VTC, improve internal combustion engine operation.
Abovely the present invention has been described, but has the invention is not restricted to these embodiments,, comprised various deformation and change in the scope that does not break away from its aim according to specific embodiment.For example, in the above-described embodiments, used to change the variable valve actuator for air of valve lift properties continuously, but be not limited thereto, also can be the variable valve actuator for air that stops to switch 2 position switch types of valve lift properties corresponding to the supply of oil pressure by 2 stages.
Claims (8)
1. the variable valve gear of an internal-combustion engine has
To the oil pressure source of working oil pressurization,
Change the air inlet side variable valve actuator for air of the valve lift properties of intake valve by oil pressure actuated,
Change the exhaust side variable valve mechanism of the valve lift properties of exhaust valve by oil pressure actuated,
Detect the oil pressure parameter detecting unit of the oil pressure parameter relevant with oil pressure, and
According to above-mentioned oil pressure parameter, forbid that the unit is forbidden in the action of the action of at least one side in air inlet side variable valve actuator for air and the exhaust side variable valve mechanism.
2. the variable valve gear of internal-combustion engine according to claim 1 is characterized in that: above-mentioned oil pressure parameter detecting unit is for detecting the oil temperature sensor of oil temperature,
Above-mentioned action forbids that the unit in the occasion that is surpassed the 1st oily temperature threshold value by the detected oil temperature of oil temperature sensor, forbids the action of at least one side in air inlet side variable valve actuator for air and the exhaust side variable valve mechanism.
3. the variable valve gear of internal-combustion engine according to claim 2, it is characterized in that: above-mentioned action forbids that the unit in the occasion that is surpassed the 1st oily temperature threshold value by the detected oil temperature of oil temperature sensor, forbids air inlet side variable valve actuator for air and exhaust side variable valve mechanism both sides' action.
4. according to the variable valve gear of claim 2 or 3 described internal-combustion engines, it is characterized in that: above-mentioned action forbids that the unit in the occasion that is surpassed the 2nd oily temperature threshold value that is lower than the 1st oily temperature threshold value by the detected oil temperature of oil temperature sensor, only forbids the action of exhaust side variable valve mechanism.
5. the variable valve gear of internal-combustion engine according to claim 1 is characterized in that: above-mentioned oil pressure parameter detecting unit is for detecting the oil pressure sensor of oil pressure,
Above-mentioned action forbids that the unit by the low occasion of detected oil pressure ratio the 1st oil pressure threshold value of oil pressure sensor, forbids the action of at least one side in air inlet side variable valve actuator for air and the exhaust side variable valve mechanism.
6. the variable valve gear of internal-combustion engine according to claim 5, it is characterized in that: above-mentioned action forbids that the unit by the low occasion of detected oil pressure ratio the 1st oil pressure threshold value of oil pressure sensor, forbids air inlet side variable valve actuator for air and exhaust side variable valve mechanism both sides' action.
7. according to the variable valve gear of claim 5 or 6 described internal-combustion engines, it is characterized in that: the occasion of unit in the 2nd oil pressure threshold value that is lower than the conduct value higher than the 1st oil pressure threshold value by the detected oil pressure of oil pressure sensor forbidden in above-mentioned action, only forbids the action of exhaust side variable valve mechanism.
8. according to the variable valve gear of any one described internal-combustion engine in the claim 1～7, it is characterized in that: have switching controls from above-mentioned oil pressure source to the air inlet side pressure control valve of the supply oil pressure of air inlet side variable valve actuator for air and switching controls from the exhaust side pressure control valve of above-mentioned oil pressure source to the supply oil pressure of exhaust side variable valve mechanism;
The oil pressure supply of unit by forbidding being undertaken by pressure control valve forbidden in above-mentioned action, thereby forbids the action of variable valve actuator for air.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP086733/2003 | 2003-03-27 | ||
| JP2003086733A JP4206793B2 (en) | 2003-03-27 | 2003-03-27 | Variable valve operating device for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1534171A true CN1534171A (en) | 2004-10-06 |
Family
ID=33401281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100066471A Pending CN1534171A (en) | 2003-03-27 | 2004-02-25 | Variator air valve device for IC engine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4206793B2 (en) |
| CN (1) | CN1534171A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101495718B (en) * | 2007-09-04 | 2011-12-21 | 曼柴油机和涡轮公司,德国曼柴油机和涡轮欧洲股份公司的联营公司 | Large-sized two-stroke diesel engine with outward mobile exhaust valve |
| CN103573423A (en) * | 2012-07-20 | 2014-02-12 | 现代自动车株式会社 | Control method for CVVL engine |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4759622B2 (en) | 2009-01-09 | 2011-08-31 | 本田技研工業株式会社 | Control device for internal combustion engine |
| KR101886503B1 (en) | 2016-08-18 | 2018-08-07 | 현대자동차주식회사 | Method for diagonosing variable valve timing system |
-
2003
- 2003-03-27 JP JP2003086733A patent/JP4206793B2/en not_active Expired - Fee Related
-
2004
- 2004-02-25 CN CNA2004100066471A patent/CN1534171A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101495718B (en) * | 2007-09-04 | 2011-12-21 | 曼柴油机和涡轮公司,德国曼柴油机和涡轮欧洲股份公司的联营公司 | Large-sized two-stroke diesel engine with outward mobile exhaust valve |
| CN103573423A (en) * | 2012-07-20 | 2014-02-12 | 现代自动车株式会社 | Control method for CVVL engine |
| CN103573423B (en) * | 2012-07-20 | 2017-09-05 | 现代自动车株式会社 | Control method for continuously variable valve lift engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004293405A (en) | 2004-10-21 |
| JP4206793B2 (en) | 2009-01-14 |
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Open date: 20041006 |