CN110195623A - A kind of control method and device of engine variable-valve timing - Google Patents
A kind of control method and device of engine variable-valve timing Download PDFInfo
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- CN110195623A CN110195623A CN201810162560.5A CN201810162560A CN110195623A CN 110195623 A CN110195623 A CN 110195623A CN 201810162560 A CN201810162560 A CN 201810162560A CN 110195623 A CN110195623 A CN 110195623A
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- Prior art keywords
- phase
- engine
- revolving speed
- camshaft
- lagging
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L2001/34486—Location and number of the means for changing the angular relationship
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention discloses the control methods and device of a kind of engine variable-valve timing, this method comprises: operating in response to engine misses, generation includes by the target instruction target word of the information of camshaft work at present phase adjustment to lagging phase；According to target instruction target word is down to, camshaft phaser is controlled by camshaft work at present phase adjustment to lagging phase；Obtain the revolving speed of engine；When the revolving speed of engine is down to default return revolving speed, camshaft is restored from lagging phase is down to initial phase.It can be seen that, after engine misses, by just restoring to the mode of initial phase when the revolving speed of engine is down to default return revolving speed by camshaft work at present phase adjustment to lagging phase, wherein, lagging phase can reduce intake and exhaust amount, engine air in-cylinder pressure variation in this way is smaller, that is, engine speed fluctuations are smaller, this mode improves the stability of flame-out rear engine, avoids the occurrence of the case where engine misses rear vehicle is acutely shaken.
Description
Technical field
The present invention relates to engine electronic control system technical field more particularly to a kind of controls of engine variable-valve timing
Method and apparatus.
Background technique
Currently, commonly used in engine variable valve timing technology (English: Variable Valve Timing, abbreviation:
VVT), the principle of VVT is the operating condition according to engine, when opening and closing by adjusting the amount and inlet and exhaust valve of adjustment intake and exhaust
Between, angle, make enter air capacity reach most preferably, raising efficiency of combustion.Specifically, engine VVT is by adjusting camshaft phase
Position, change air inflow can with the variation of engine speed.
Camshaft has initial phase in engine VVT technology, which is the starting for comprehensively considering engine, row
It the performances such as puts, burn to preset, it may be possible to any one in advanced phase, intermediate phase and lagging phase.Different hairs
The corresponding camshaft operating phase of motivation operating condition is different.In order to ensure accurately controlling VVT when igniting, after engine misses
Camshaft need to restore from operating phase to initial phase.In the prior art, after engine misses, electronic control unit (English:
Electronic Control Unit, abbreviation: ECU) control OCV Oil Control Valve (English: Oil Control Valve, abbreviation:
OCV it) directly powers off, control camshaft phaser (English: Cam Phaser, abbreviation: CP) is current by camshaft by engine oil pressure
Operating phase is adjusted to initial phase.
Inventor has found that flame-out rear camshaft phase variation will affect the flame-out stability of engine by experimental study,
That is, the engine speed fluctuations after flame-out are horizontal, the control method of ECU is only powered off back after engine misses in the prior art
Return initial phase, lack corresponding phase control strategy, leads to inner pressure of air cylinder variation greatly, engine speed fluctuations are big, in turn
There is the case where engine misses rear vehicle is acutely shaken.
Summary of the invention
The technical problem to be solved by the invention is to provide the control methods and dress of a kind of engine variable-valve timing
It sets, to reduce the air inflow of cylinder, so that the variation of engine air in-cylinder pressure is smaller, engine speed fluctuations are smaller,
To improve the stability of flame-out rear engine, the case where engine misses rear vehicle is acutely shaken is avoided the occurrence of.
In a first aspect, the embodiment of the invention provides a kind of control method of engine variable-valve timing, this method packet
It includes:
It is operated in response to engine misses, generates target instruction target word, the target instruction target word includes by camshaft work at present phase
Position is adjusted to the information of lagging phase；
According to the target instruction target word, camshaft phaser is controlled by camshaft work at present phase adjustment to lagging phase；
Obtain the revolving speed of engine；
When the revolving speed of the engine is down to default return revolving speed, the lagging phase is restored to initial phase.
Preferably, the initial phase is advanced phase or intermediate phase.
Preferably, described when the revolving speed of the engine is down to default return revolving speed, the lagging phase is restored to first
Beginning phase, comprising:
Judge whether the revolving speed of the engine is down to default return revolving speed；
If it is not, returning to the revolving speed for executing and obtaining engine；
If so, restoring the lagging phase to initial phase.
Preferably, described if so, restoring the lagging phase to initial phase, comprising:
When the revolving speed of the engine is down to default return revolving speed, generation cut-offing instruction；
According to cut-offing instruction, controls camshaft phaser and restore camshaft lagging phase to initial phase.
Preferably, described according to cut-offing instruction, it controls camshaft phaser and restores camshaft lagging phase to initial phase
Position, specifically:
Control camshaft phaser restores camshaft lagging phase to initial phase by engine oil pressure.
Second aspect, the embodiment of the invention provides a kind of control device of engine variable-valve timing, feature exists
In, comprising:
First generation unit generates target instruction target word, the target instruction target word includes will for operating in response to engine misses
Camshaft work at present phase adjustment to lagging phase information；
First control unit, for controlling camshaft phaser for camshaft work at present phase according to the target instruction target word
Position is adjusted to lagging phase；
Acquiring unit, for obtaining the revolving speed of engine；
First recovery unit is down to default return revolving speed for the revolving speed when the engine, and the lagging phase is extensive
Again to initial phase.
Preferably, the initial phase is advanced phase or intermediate phase.
Preferably, first recovery unit includes judging unit, return unit and the second recovery unit；
The judging unit, for judging whether the revolving speed of the engine is down to default return revolving speed；
The return unit, for executing the revolving speed for obtaining engine if it is not, returning；
Second recovery unit, for if so, restoring the lagging phase to initial phase.
Preferably, second recovery unit includes the second generation unit and the second control unit；
Second generation unit is down to default return revolving speed for the revolving speed when the engine, generates cut-offing instruction；
Second control unit, for controlling camshaft phaser camshaft lagging phase is extensive according to cut-offing instruction
Again to initial phase.
Preferably, second control unit is specifically used for: control camshaft phaser relies on engine oil pressure by camshaft
Lagging phase is restored to initial phase.
Compared with prior art, the present invention has at least the following advantages:
Using the technical solution of the embodiment of the present invention, firstly, operating in response to engine misses, electronic control unit is generated
Including by the target instruction target word of the information of camshaft work at present phase adjustment to lagging phase；Then, electronic control unit according to
The target instruction target word controls camshaft phaser for camshaft work at present phase adjustment to lagging phase；Then, it is controlled electronically
The revolving speed of unit acquisition engine；Finally, when the revolving speed for the engine that electronic control unit obtains is down to default return revolving speed,
Camshaft is restored from the lagging phase to initial phase.It can be seen that after engine misses, by by the current work of camshaft
Make phase adjustment to lagging phase, just restores when the revolving speed of engine is down to default return revolving speed to the side of initial phase
Formula, wherein lagging phase can reduce intake and exhaust amount, and such engine air in-cylinder pressure variation is smaller, that is, engine speed wave
Dynamic smaller, this mode improves the stability of flame-out rear engine, avoids the occurrence of what engine misses rear vehicle was acutely shaken
Situation.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is system framework schematic diagram involved in application scenarios a kind of in the embodiment of the present invention；
Fig. 2 is a kind of flow diagram of the control method of engine variable-valve timing provided in an embodiment of the present invention；
Fig. 3 is the process signal of the control method of another engine variable-valve timing provided in an embodiment of the present invention
Figure；
Fig. 4 is a kind of structural schematic diagram of the control device of engine variable-valve timing provided in an embodiment of the present invention.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only this
Invention a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
Inventor has found that in the prior art, after engine misses, electronic control unit generates cut-offing instruction
And send to OCV Oil Control Valve, it controls OCV Oil Control Valve and directly powers off, at this point, electronic control unit can only control camshaft phase
Device relies on engine oil pressure by camshaft work at present phase adjustment to initial phase.By test of many times it is found that flame-out rear camshaft
Phase change will affect the flame-out stability of engine, that is, the engine speed fluctuations after flame-out are horizontal, and send out in the prior art
The control method of ECU is only powered off recurrence initial phase after motivation is flame-out, lacks corresponding phase control strategy, leads to cylinder
Interior pressure change is big, and engine speed fluctuations are big, and then the case where engine misses rear vehicle is acutely shaken occurs.
In order to solve this problem, in embodiments of the present invention, firstly, being operated in response to engine misses, electronic control
Unit generation includes by the target instruction target word of the information of camshaft work at present phase adjustment to lagging phase；Then, it is controlled electronically
Unit controls camshaft phaser for camshaft work at present phase adjustment to lagging phase according to the target instruction target word；Then,
The revolving speed of electronic control unit acquisition engine；It is preset back finally, being down to when the revolving speed of the engine of electronic control unit acquisition
When the revolving speed of position, camshaft is restored from the lagging phase to initial phase.It can be seen that after engine misses, by will be convex
Wheel shaft work at present phase adjustment is just restored when the revolving speed of engine is down to default return revolving speed to initial to lagging phase
The mode of phase, wherein lagging phase can reduce intake and exhaust amount, and such engine air in-cylinder pressure variation is smaller, that is, starts
The machine fluctuation of speed is smaller, and this mode improves the stability of flame-out rear engine, and it is acute to avoid the occurrence of engine misses rear vehicle
The case where strong shake.
For example, one of the scene of the embodiment of the present invention, can be applied in scene as shown in Figure 1.The scene
Including electronic control unit 101, OCV Oil Control Valve 102 and camshaft phaser 103, camshaft 104 and engine 105.Electronics
Control unit 101 is operated in response to engine misses, is generated target instruction target word and is sent to OCV Oil Control Valve 102, the target refers to
Order includes by the information of camshaft work at present phase adjustment to lagging phase；According to the target instruction target word, electronic control unit
101 control camshaft phaser 103 for 104 work at present phase adjustment of camshaft to lagging phase by OCV Oil Control Valve 102；
105 revolving speed is started in the acquisition of electronic control unit 101；When the revolving speed of the engine 105 is down to default return revolving speed, electronics
Control unit 101 controls camshaft phaser 103 and restores 104 lagging phase of camshaft to initial phase.
It is understood that in above-mentioned application scenarios, although by the action description of embodiment of the present invention by electronics control
Unit 101 processed executes, but these movements can also be executed partially, by electronic control unit 101 partially by OCV Oil Control Valve
102, it is partially executed by camshaft phaser 103.The present invention is unrestricted in terms of executing subject, as long as performing of the invention real
Apply movement disclosed in mode.
It is understood that above-mentioned scene is only a Sample Scenario provided in an embodiment of the present invention, the embodiment of the present invention
It is not limited to this scene.
With reference to the accompanying drawing, by embodiment come the control of engine variable-valve timing in the present invention will be described in detail embodiment
The specific implementation of method and apparatus processed.
Illustrative methods
Referring to fig. 2, a kind of process of the control method of engine variable-valve timing in the embodiment of the present invention is shown to show
It is intended to.In the present embodiment, the method for example may comprise steps of:
Step 201: being operated in response to engine misses, generate target instruction target word, the target instruction target word includes working as camshaft
Preceding operating phase is adjusted to the information of lagging phase.
It is understood that by repeatedly test it is found that if directly generated after engine misses cut-offing instruction control power-off,
There is no any corresponding camshaft phase control strategy, the oil pressure for allowing camshaft phaser to generate by engine speed variation
Power changes camshaft work at present phase recovery to initial phase, engine air in-cylinder pressure greatly, and engine speed fluctuations are big,
And then there is the case where engine misses rear vehicle is acutely shaken.In order to enable the variation of engine air in-cylinder pressure is smaller, it can be with
By the way of by camshaft work at present phase adjustment to lagging phase, to reduce the air inflow of cylinder, so that hair
The variation of motivation inner pressure of air cylinder is smaller.Thus, after engine misses, firstly, step 201 should be executed, in response to engine
Quenching operations are not powered off directly, and state is still remained powered on, and are generated one and are carried camshaft work at present phase adjustment extremely
The target instruction target word of the information of lagging phase, to execute step 202.
Step 202: according to the target instruction target word, controlling camshaft phaser for camshaft work at present phase adjustment to stagnant
Phase afterwards.
It is understood that executing step 202 by the air inflow of reduction cylinder, so that cylinder internal pressure
Power variation is smaller, the stability of flame-out rear engine is improved, to solve in the prior art directly by camshaft work at present
Greatly, engine speed fluctuations are big, and vehicle shake is asked for the engine air in-cylinder pressure variation that phase recovery to initial phase generates
Topic.
Step 203: obtaining the revolving speed of engine.
It is understood that accurately controlling VVT in order to ensure lighting a fire next time when starting engine, being put out in engine
After fire, camshaft finally needs to restore to initial phase.Due in step 202 by camshaft work at present phase adjustment extremely
Lagging phase needs to restore camshaft lagging phase to initial phase in specific time.The specific time is related to engine
Revolving speed obtain the revolving speed of engine therefore, it is necessary to execute step 203, to determine specific time, wherein obtain engine
Revolving speed refer in real time obtain engine revolving speed.
Step 204: when the revolving speed of the engine is down to default return revolving speed, the lagging phase being restored to initial
Phase.
It is understood that the revolving speed that ought exactly state engine that specific time mentioned above refers to is down to default return and is turned
When fast, camshaft lagging phase can just be restored to initial phase at this time.Wherein, the default return revolving speed refers to electronics control
Unit processed executes control power-off, camshaft phase is restored to the rotary speed threshold value of initial phase step, which is to comprehensively consider
It is obtained by calibrating in advance after various engines operating condition.For example, default return revolving speed can be demarcated as 500rpm in advance.
It should be noted that camshaft initial phase may be advanced phase, intermediate phase or lagging phase, if cam
Axis initial phase is lagging phase, and directly camshaft work at present phase recovery to initial phase is equal in step 202, will
Camshaft work at present phase adjustment, need not be by the way of the present embodiment to lagging phase；However, working as camshaft initial phase
Position is not lagging phase, that is, when camshaft initial phase is advanced phase or intermediate phase, needs the side using the present embodiment
Formula just can solve prior art problem first by camshaft work at present phase adjustment to lagging phase.Therefore, in the present embodiment
In, the initial phase is advanced phase or intermediate phase.
It should be noted that the revolving speed for the engine that step 203 obtains in real time is not necessarily down to default return revolving speed, generally
Determine whether the revolving speed for the engine that step 203 obtains in real time is down to default return revolving speed by the way of judgement.In this reality
It applies in some embodiments of example, the step 204 for example may comprise steps of:
Step A: judging whether the revolving speed of the engine is down to default return revolving speed, if it is not, entering step B；If so, into
Enter step C；
Step B: the revolving speed for executing and obtaining engine is returned；
Step C: the lagging phase is restored to initial phase.
Wherein, it enters step B and just refers to and return to step 203.
It should be noted that in practical applications, being achieved in that of above-mentioned steps C is down to default in the revolving speed of engine
When return revolving speed, electronic control unit controls OCV Oil Control Valve power-off, and after power is turned off, electronic control unit controls camshaft phase
Position device restores camshaft lagging phase to initial phase, that is, and the mode phase of prior art power-off, recovery to initial phase
Together.Therefore, in some embodiments of the present embodiment, the step C for example be may comprise steps of:
Step C1: when the revolving speed of the engine is down to default return revolving speed, generation cut-offing instruction；
Step C2: it according to cut-offing instruction, controls camshaft phaser and restores camshaft lagging phase to initial phase.
It should be noted that OCV Oil Control Valve and electronic control unit power off after step C1 generates cut-offing instruction, this
When, camshaft phaser can only restore camshaft lagging phase to first by the engine oil pressure that the rotation speed change of engine generates
Beginning phase.Therefore, in some embodiments of the present embodiment, the step C2 is for example specifically as follows: control camshaft phase
Position device restores camshaft lagging phase to initial phase by engine oil pressure.
The various embodiments provided through this embodiment, firstly, being operated in response to engine misses, electronic control unit
Generation includes by the target instruction target word of the information of camshaft work at present phase adjustment to lagging phase；Then, electronic control unit
According to the target instruction target word, camshaft phaser is controlled by camshaft work at present phase adjustment to lagging phase；Then, electronics
The revolving speed of control unit acquisition engine；Turn finally, being down to default return when the revolving speed of the engine of electronic control unit acquisition
When fast, camshaft is restored from the lagging phase to initial phase.It can be seen that after engine misses, by by camshaft
Work at present phase adjustment is just restored when the revolving speed of engine is down to default return revolving speed to initial phase to lagging phase
Mode, wherein lagging phase can reduce intake and exhaust amount, and such engine air in-cylinder pressure variation is smaller, that is, engine turns
Speed fluctuation is smaller, and this mode improves the stability of flame-out rear engine, avoids the occurrence of engine misses rear vehicle and acutely trembles
Dynamic situation.
In practical applications, by taking default return revolving speed can be demarcated as 500rpm in advance as an example, pass through the following examples
The specific implementation of the control method of engine variable-valve timing in embodiment that the present invention will be described in detail.
Referring to Fig. 3, the process signal of the control of another engine variable-valve timing in the embodiment of the present invention is shown
Figure.In the present embodiment, the method for example may comprise steps of:
Step 301: electronic controller is operated in response to engine misses, generates target instruction target word, and the target instruction target word includes
By the information of camshaft work at present phase adjustment to lagging phase.
Step 302: electronic controller sends the target instruction target word to OCV Oil Control Valve.
Step 303: OCV Oil Control Valve is flowed to and is flowed by adjusting spool position control machine oil according to the target instruction target word
Amount generates the first engine oil pressure.
Step 304: OCV Oil Control Valve feeds back first engine oil pressure to camshaft phaser.
Step 305: camshaft phaser is according to first engine oil pressure, by camshaft work at present phase adjustment to stagnant
Phase afterwards.
Step 306: the revolving speed of electronic controller acquisition engine.
Step 307: electronic controller judges whether the revolving speed of the engine is down to default return revolving speed, if it is not, returning
Step 306；If so, entering step 308.
Step 308: electronic controller generates cut-offing instruction.
Step 309: electronic controller sends the cut-offing instruction to OCV Oil Control Valve.
Step 310: OCV Oil Control Valve is powered off according to the cut-offing instruction and the electronic controller.
Step 311: camshaft phaser restores camshaft lagging phase to initial phase, institute by the second engine oil pressure
Stating the second engine oil pressure is generated according to the rotation speed change of the engine.
The various embodiments provided through this embodiment, firstly, being operated in response to engine misses, electronic control unit
Generation includes by the target instruction target word of the information of camshaft work at present phase adjustment to lagging phase；Then, electronic control unit
According to the target instruction target word, camshaft phaser is controlled by camshaft work at present phase adjustment to lagging phase；Then, electronics
The revolving speed of control unit acquisition engine；Turn finally, being down to default return when the revolving speed of the engine of electronic control unit acquisition
When fast, camshaft is restored from the lagging phase to initial phase.It can be seen that after engine misses, by by camshaft
Work at present phase adjustment is just restored when the revolving speed of engine is down to default return revolving speed to initial phase to lagging phase
Mode, wherein lagging phase can reduce intake and exhaust amount, and such engine air in-cylinder pressure variation is smaller, that is, engine turns
Speed fluctuation is smaller, and this mode improves the stability of flame-out rear engine, avoids the occurrence of engine misses rear vehicle and acutely trembles
Dynamic situation.
Example devices
Referring to fig. 4, a kind of structure of the control device of engine variable-valve timing in the embodiment of the present invention is shown to show
It is intended to.In the present embodiment, described device for example can specifically include:
First generation unit 401 generates target instruction target word, the target instruction target word packet for operating in response to engine misses
It includes the information of camshaft work at present phase adjustment to lagging phase；
First control unit 402, for controlling camshaft phaser for camshaft work at present according to the target instruction target word
Phase adjustment is to lagging phase；
Acquiring unit 403, for obtaining the revolving speed of engine；
First recovery unit 404 is down to default return revolving speed for the revolving speed when the engine, by the lagging phase
Restore to initial phase.
Optionally, the initial phase is advanced phase or intermediate phase.
Optionally, first recovery unit 404 includes judging unit, return unit and the second recovery unit；
The judging unit, for judging whether the revolving speed of the engine is down to default return revolving speed；
The return unit, for executing the revolving speed for obtaining engine if it is not, returning；
Second recovery unit, for if so, restoring the lagging phase to initial phase.
Optionally, second recovery unit includes the second generation unit and the second control unit；
Second generation unit is down to default return revolving speed for the revolving speed when the engine, generates cut-offing instruction；
Second control unit, for controlling camshaft phaser camshaft lagging phase is extensive according to cut-offing instruction
Again to initial phase.
Optionally, second control unit is specifically used for: control camshaft phaser relies on engine oil pressure by camshaft
Lagging phase is restored to initial phase.
The various embodiments provided through this embodiment, firstly, being operated in response to engine misses, electronic control unit
Generation includes by the target instruction target word of the information of camshaft work at present phase adjustment to lagging phase；Then, electronic control unit
According to the target instruction target word, camshaft phaser is controlled by camshaft work at present phase adjustment to lagging phase；Then, electronics
The revolving speed of control unit acquisition engine；Turn finally, being down to default return when the revolving speed of the engine of electronic control unit acquisition
When fast, camshaft is restored from the lagging phase to initial phase.It can be seen that after engine misses, by by camshaft
Work at present phase adjustment is just restored when the revolving speed of engine is down to default return revolving speed to initial phase to lagging phase
Mode, wherein lagging phase can reduce intake and exhaust amount, and such engine air in-cylinder pressure variation is smaller, that is, engine turns
Speed fluctuation is smaller, and this mode improves the stability of flame-out rear engine, avoids the occurrence of engine misses rear vehicle and acutely trembles
Dynamic situation.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.The terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or equipment for including a series of elements not only includes those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or equipment institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including institute
State in the process, method, article or equipment of element that there is also other identical elements.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (10)
1. a kind of control method of engine variable-valve timing characterized by comprising
It is operated in response to engine misses, generates target instruction target word, the target instruction target word includes by camshaft work at present phase tune
The whole information to lagging phase；
According to the target instruction target word, camshaft phaser is controlled by camshaft work at present phase adjustment to lagging phase；
Obtain the revolving speed of engine；
When the revolving speed of the engine is down to default return revolving speed, the lagging phase is restored to initial phase.
2. the method according to claim 1, wherein the initial phase is advanced phase or intermediate phase.
3. the method according to claim 1, wherein described when the revolving speed of the engine is down to default return turn
Speed restores the lagging phase to initial phase, comprising:
Judge whether the revolving speed of the engine is down to default return revolving speed；
If it is not, returning to the revolving speed for executing and obtaining engine；
If so, restoring the lagging phase to initial phase.
4. according to the method described in claim 3, it is characterized in that, described if so, restoring the lagging phase to initial phase
Position, comprising:
When the revolving speed of the engine is down to default return revolving speed, generation cut-offing instruction；
According to cut-offing instruction, controls camshaft phaser and restore camshaft lagging phase to initial phase.
5. according to the method described in claim 4, controlling camshaft phaser will it is characterized in that, described according to cut-offing instruction
Camshaft lagging phase is restored to initial phase, specifically:
Control camshaft phaser restores camshaft lagging phase to initial phase by engine oil pressure.
6. a kind of control device of engine variable-valve timing characterized by comprising
First generation unit generates target instruction target word, the target instruction target word includes by cam for operating in response to engine misses
Axis work at present phase adjustment to lagging phase information；
First control unit, for controlling camshaft phaser for camshaft work at present phase tune according to the target instruction target word
It is whole to lagging phase；
Acquiring unit, for obtaining the revolving speed of engine；
First recovery unit, for being down to default return revolving speed when the revolving speed of the engine, by the lagging phase restore to
Initial phase.
7. device according to claim 6, which is characterized in that the initial phase is advanced phase or intermediate phase.
8. device according to claim 6, which is characterized in that first recovery unit includes judging unit, returns to list
Member and the second recovery unit；
The judging unit, for judging whether the revolving speed of the engine is down to default return revolving speed；
The return unit, for executing the revolving speed for obtaining engine if it is not, returning；
Second recovery unit, for if so, restoring the lagging phase to initial phase.
9. device according to claim 8, which is characterized in that second recovery unit includes the second generation unit and the
Two control units；
Second generation unit is down to default return revolving speed for the revolving speed when the engine, generates cut-offing instruction；
Second control unit, for according to cut-offing instruction, control camshaft phaser by camshaft lagging phase restore to
Initial phase.
10. device according to claim 9, which is characterized in that second control unit is specifically used for: control camshaft
Phaser restores camshaft lagging phase to initial phase by engine oil pressure.
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| CN201810162560.5A CN110195623B (en) | 2018-02-27 | 2018-02-27 | Method and device for controlling variable valve timing of engine |
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| CN201810162560.5A CN110195623B (en) | 2018-02-27 | 2018-02-27 | Method and device for controlling variable valve timing of engine |
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| CN110195623B CN110195623B (en) | 2021-04-16 |
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Cited By (1)
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| CN113719362A (en) * | 2021-08-02 | 2021-11-30 | 东风康明斯发动机有限公司 | Diesel engine flameout jitter mitigation method, control system and computer storage medium |
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