CN109404141B - Variable valve control device and method - Google Patents
Variable valve control device and method Download PDFInfo
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- CN109404141B CN109404141B CN201811331006.1A CN201811331006A CN109404141B CN 109404141 B CN109404141 B CN 109404141B CN 201811331006 A CN201811331006 A CN 201811331006A CN 109404141 B CN109404141 B CN 109404141B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000003321 amplification Effects 0.000 claims abstract description 24
- 238000006073 displacement reaction Methods 0.000 claims abstract description 24
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 24
- 239000003921 oil Substances 0.000 claims description 37
- 230000009849 deactivation Effects 0.000 claims description 13
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 239000000446 fuel Substances 0.000 claims description 6
- 239000010720 hydraulic oil Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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Classifications
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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
- F02D13/0203—Variable control of intake and exhaust valves
- F02D13/0207—Variable control of intake and exhaust valves changing valve lift or valve lift and timing
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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
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
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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
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
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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
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
- F01L9/24—Piezoelectric actuators
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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
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/40—Methods of operation thereof; Control of valve actuation, e.g. duration or lift
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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
- F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake
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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
- F02D13/06—Cutting-out cylinders
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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 a variable valve control device and a method, wherein a piezoelectric module and an electromagnetic driving module are adopted in the variable valve control device, so that the hybrid control of piezoelectric driving and electromagnetic driving is realized, the piezoelectric driving lift is increased through a displacement amplification module, the lift and current double-closed-loop control is adopted when the variable valve control device is controlled, the working condition and the functional requirement of an engine are combined, and a control mode is determined, so that the high control precision is realized, and the requirements of different working conditions are met.
Description
Technical Field
The invention relates to the technical field of valve control, in particular to a variable valve control device and method.
Background
The air distribution phase mechanism of the engine is responsible for providing fresh air necessary for gasoline or diesel oil to a cylinder to do work through combustion, and discharging burnt waste gas.
The traditional engine uses a fixed valve mechanism, the valve timing and the lift range of the engine are both considered, and the valve timing and the lift range of the internal combustion engine can not be changed according to the rotating speed of the internal combustion engine, so that the working requirements of the engine under different rotating speed working conditions are hardly considered. The fixed valve mechanism enables the control precision of the valve to be low, and the requirements of different working conditions of the engine cannot be met.
Disclosure of Invention
Aiming at the problems, the invention provides a variable valve control device and method, which achieve the purposes of improving the control precision of a valve and meeting the requirements of different working conditions of an engine.
In order to achieve the purpose, the invention provides the following technical scheme:
a variable valve control apparatus comprising:
the air valve comprises a piezoelectric module, a displacement amplification module and an electromagnetic driving module, wherein the piezoelectric module is arranged at the top of the air valve, the displacement amplification module is arranged below the piezoelectric module, the electromagnetic driving module is connected below the displacement amplification module, and the electromagnetic driving module is arranged at the bottom of the air valve;
the piezoelectric module drives the valve to be in a closed state to an open state, and after the valve is opened, the electromagnetic driving module drives the valve to be in a preset state matched with the working condition requirement of the engine.
Optionally, the displacement amplification module comprises a piston, the upper diameter and the lower diameter of the piston are different in size, and hydraulic oil is filled in the upper cavity and the lower cavity of the piston to form a closed displacement amplification module;
the electromagnetic drive module comprises an electromagnetic coil and a valve spring.
Optionally, the displacement method module further includes:
the hydraulic control system comprises a first oil inlet, a second oil inlet, a first control cavity, a second control cavity, a third control cavity and an electromagnetic valve, wherein hydraulic oil enters the second control cavity and the third control cavity through the first oil inlet and the second oil inlet respectively, the first control cavity is communicated with the third control cavity through an oil duct on a piston, an oil outlet is formed in the second control cavity, and oil drainage of the oil outlet is controlled by the electromagnetic valve at any time.
A variable valve control method applied to the above variable valve control apparatus, the method comprising:
determining a valve lift requirement according to the working condition and the functional requirement of the engine;
determining a driving control mode according to the valve lift requirement, wherein the driving control mode comprises a piezoelectric driving control mode and a hybrid driving control mode, the piezoelectric driving mode drives the piezoelectric module to work, and the hybrid driving control mode drives the piezoelectric module and the electromagnetic driving module to work;
and according to the driving control mode, carrying out lift and current double-closed-loop control on the variable valve control device, and realizing timing and lift control on the valve.
Optionally, the functional requirements of the engine include one or more of:
thermal management requirements, miller cycle requirements, exhaust braking requirements, and cylinder deactivation fuel cut requirements.
Optionally, the determining a drive control mode according to the valve lift demand includes:
and judging whether a piezoelectric driving preset condition is met or not according to the valve lift requirement, if so, determining the driving control mode as a piezoelectric driving control mode, otherwise, determining the driving control mode as a hybrid driving control mode, wherein the piezoelectric driving preset condition comprises that the air quantity requirement is smaller than a first threshold value or the lift is smaller than a second threshold value.
Optionally, the performing lift and current double closed loop control on the variable valve control apparatus according to the driving control mode includes:
calculating to obtain a lift set value according to the rotating speed and the load of the engine;
comparing the actual lift value fed back by the variable valve control device with the set lift value to obtain a comparison result;
adjusting the lift according to the comparison result to realize the lift closed-loop control of the variable valve control device;
converting actual current and target current of the variable valve control device into duty ratio according to the characteristic relation between piezoelectric deformation lift and current of a piezoelectric module in the variable valve control device;
and adding a correction coefficient to the duty ratio for adjustment, adjusting the actual current according to the adjusted duty ratio to obtain the actual lift, and realizing the current closed-loop control of the variable valve control device.
Optionally, the method further comprises:
if the functional requirement of the engine is a thermal management requirement or a Miller cycle requirement, adopting intake valve timing control on the variable valve control device;
if the functional requirement of the engine is an exhaust braking requirement, judging whether an intake valve needs to be opened for the second time, if so, adopting intake valve lift control on the variable valve control device, otherwise, adopting exhaust valve timing control;
and if the functional requirement of the engine is the cylinder deactivation and fuel cut-off requirement, determining the number of cylinder deactivation and the cylinder number according to the load and the running condition of the whole vehicle, and performing lift control on the exhaust valve with the determined cylinder number.
Optionally, the method further comprises:
the functional requirements of the engine are determined based on the state of the engine.
Optionally, said determining a functional requirement of the engine based on a state of the engine comprises:
if the engine is in cold start or meets preset load exhaust temperature, determining that the function requirement of the engine is a heat management requirement;
if the engine runs in a preset efficiency interval, determining that the function requirement of the engine is a Miller cycle requirement, wherein the Miller cycle requirement ensures that an expansion stroke is larger than a compression stroke;
if the whole vehicle needs exhaust auxiliary braking, determining that the function requirement of the engine is an exhaust braking requirement;
and if the whole vehicle or the engine needs to adopt cylinder deactivation and oil cut, determining that the functional requirement of the engine is the cylinder deactivation and oil cut requirement.
Compared with the prior art, the variable valve control device and the method provided by the invention have the advantages that the piezoelectric module and the electromagnetic driving module are adopted in the variable valve control device, the hybrid control of the piezoelectric driving and the electromagnetic driving is realized, the piezoelectric driving lift is increased in the displacement amplification module, the lift and current double-closed-loop control is adopted when the variable valve control device is controlled, the working condition and the function requirement of an engine are combined, and the control mode is determined, so that the control precision is high, and the requirements of different working conditions are met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a variable valve control apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a displacement amplification module according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a variable valve control method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of lift and current dual closed loop control according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first" and "second," and the like in the description and claims of the present invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not set forth for a listed step or element but may include steps or elements not listed.
In an embodiment of the present invention, there is provided a variable valve control apparatus, referring to fig. 1, including:
the air valve comprises a piezoelectric module (I), a displacement amplification module (II) and an electromagnetic driving module (III), wherein the piezoelectric module (I) is arranged at the top of the air valve, the displacement amplification module (II) is arranged below the piezoelectric module (I), the electromagnetic driving module (III) is connected below the displacement amplification module (II), and the electromagnetic driving module (III) is arranged at the bottom of the air valve;
the valve is driven to be in a closed state to an open state through the piezoelectric module (I), and after the valve is opened, the electromagnetic driving module (III) drives the valve to be in a preset state matched with the working condition requirement of the engine.
It should be noted that, the space for arranging the piezoelectric module on the top of the valve is limited, so the geometric size of the piezoelectric module is as small as possible, but the piezoelectric layer is too small to meet the requirement of the valve lift, so a separate displacement amplification module needs to be arranged below the piezoelectric module to meet the requirement of the maximum valve lift. Still referring to fig. 1, the displacement amplification module (ii) comprises: the piston (1) is different in upper and lower diameter, the upper and lower diameters of the piston (1) are designed and selected according to the maximum lift design requirement of the air valve (4), and the upper and lower cavities of the piston are filled with hydraulic oil to form a closed hydraulic amplification module. The electromagnetic drive module (III) comprises an electromagnetic coil (2) and a valve spring (3).
Referring to fig. 2, fig. 2 is a schematic structural diagram of a displacement amplification module according to an embodiment of the present invention, where the displacement amplification module further includes:
the oil pump comprises a first oil inlet (5), a second oil inlet (6), a first control cavity (7), a second control cavity (8), an oil outlet (9), a piston (11), a third control cavity (12) and an electromagnetic valve (10). Hydraulic oil respectively enters and controls a second control cavity (8) and a third control cavity (12) through a first oil inlet (5) and a second oil inlet (6), wherein the first control cavity (7) is communicated with the third control cavity (12) through an oil duct on a piston (11), an oil outlet (9) is formed in the second control cavity (8), and oil drainage of the oil outlet (9) is controlled by an electromagnetic valve (10) at any time. When the electromagnetic valve (10) is opened to discharge oil, the oil pressure in the second control cavity (8) is reduced, and the piston (11) moves downwards after breaking the balance of the upper pressure and the lower pressure.
The variable valve control device provided by the embodiment of the invention adopts the valve driven by the piezoelectric and electromagnetic hybrid, and the resistance is relatively high when the valve is just opened, so that the valve can be opened by instantaneous high output force generated by the driving of the piezoelectric module, when the valve is opened, the motion resistance of the valve is rapidly reduced, and the valve is driven by the electromagnetic driving to continue to move until the valve is completely opened. The hybrid drive control of the piezoelectric module and the electromagnetic module is adopted, and the displacement amplification module is adopted to increase the piezoelectric drive lift and improve the valve control precision.
In another embodiment of the present invention, there is also provided a variable valve control method applied to the above-described variable valve control apparatus, referring to fig. 3, the method including:
s301, determining a valve lift requirement according to the working condition and the functional requirement of the engine;
firstly, judging a valve lift demand according to the working condition and the function demand of an engine, judging whether a piezoelectric driving preset condition is met or not according to the valve lift demand, if so, determining the driving control mode as a piezoelectric driving control mode, otherwise, determining the driving control mode as a hybrid driving control mode, wherein the piezoelectric driving preset condition comprises that the air quantity demand is smaller than a first threshold value or the lift is smaller than a second threshold value.
S302, determining a driving control mode according to the valve lift requirement, wherein the driving control mode comprises a piezoelectric driving control mode and a hybrid driving control mode, the piezoelectric driving mode drives the piezoelectric module to work, and the hybrid driving control mode drives the piezoelectric module and the electromagnetic driving module to work.
For example, in a functional mode with small air quantity requirement or low lift control requirement, piezoelectric drive single control is selected, and in other working conditions or modes, hybrid drive control is selected.
And S303, according to the driving control mode, carrying out lift and current double-closed-loop control on the variable valve control device, and realizing timing and lift control on the valve.
Referring to fig. 4, a lift and current dual closed loop control scheme is provided according to an embodiment of the present invention.
The double closed-loop control flow is that the lift control is used as a large cycle, the current control is used as a small cycle, the current control is nested in the lift closed loop, and the lift control precision is ensured by the double closed-loop control flow and the small cycle.
Firstly, a lift set value is calculated according to the rotating speed and the load of an engine, the lift fed back actually is compared with the lift set value, then the lift is adjusted through lift feedforward control and lift PID control, and the steps are repeated in this way, so that the closed-loop control of the lift is realized.
For the current closed-loop control, adjustment is carried out according to the characteristic relation between the piezoelectric deformation lift and the current, the target current is compared with the actual current, the adjustment is carried out by adding a correction coefficient after the duty ratio is converted, and finally the current closed-loop control is realized.
And calculating the set valve lift according to the running states of the whole vehicle and the engine, and controlling by judging the functional requirements. Wherein, the functional requirements include: the method comprises the following steps of heat management requirements, Miller cycle requirements, exhaust braking requirements and cylinder deactivation and oil cut requirements, wherein the Miller cycle means that the expansion ratio is larger than the compression ratio through early closing or late closing of a valve, the ignition temperature is reduced, and NO is reducedXDischarge, simultaneously prolong the effective expansion stroke, improve the thermal efficiency and reduce the oil consumption. The heat management requirement is also called as heat exhaust management, and in order to meet the requirement of post-treatment heat exhaust, the excess air coefficient is changed by means of hardware matching or software calibration so as to achieve the purpose of heat exhaust. The brake in the cylinder is near the compression top dead center, the exhaust valve is opened at a small angle, the compression energy is released, high negative pressure is formed in the cylinder in the expansion process, and the brake power is increased.
The heat management and the Miller cycle are controlled by adopting variable intake valves, the valve timing can meet requirements, the exhaust braking is controlled by adopting the opening timing of an exhaust valve, whether the intake valve needs to be opened for the second time or not is judged according to the braking power requirement, the cylinder deactivation and the oil cut are controlled by adopting the zero lift range of the intake valve and the exhaust valve, and the number of cylinders are judged according to the load of the whole vehicle and the operating condition.
When the engine is in different functional modes, the selected valve change forms are different, and when the engine is in cold start or the low-load exhaust temperature is low, the engine starting performance or the conversion efficiency of an aftertreatment system needs to be improved by adopting a thermal management mode, namely, an air inlet valve is required to be closed early to change the combustion performance of the engine, and the air inlet valve timing is selected; when the engine runs in a high-efficiency interval, the oil consumption is reduced by adopting the Miller cycle, the Miller cycle means is that an inlet valve is closed early to reduce the air inflow and simultaneously the expansion stroke is larger than the compression stroke, when the whole vehicle needs exhaust auxiliary braking, two modes can be adopted, one mode is that the inlet valve is opened for the second time near a compression top dead center to release the pressure, namely the inlet valve lift, and the other mode is realized together with an exhaust butterfly valve, when the exhaust butterfly valve is closed, an exhaust valve is opened, and the back pressure in the exhaust pipe is utilized to apply negative work to a piston, namely the exhaust valve is timed; when the whole vehicle or the engine needs to adopt cylinder deactivation and fuel cut, the cylinder where the fuel cut and the fire cut are located needs to close the exhaust valve and the intake valve, namely the lift of the intake valve and the lift of the exhaust valve are zero.
According to the variable valve control method provided by the embodiment of the invention, the piezoelectric module and the electromagnetic module are adopted for hybrid drive control, so that the characteristics of large instantaneous driving force and small displacement of piezoelectric drive are combined with large displacement, slow response and the like of electromagnetic drive; the lift and current double closed-loop control is adopted, the control precision is high, the piezoelectric driving lift is increased by adopting a hydraulic amplification mechanism, the working condition or function required by the lift is small, the piezoelectric driving is independently used, and the response is fast. Meanwhile, the compression stroke of the engine can be smaller than the expansion stroke by closing the inlet valve early or closing the inlet valve late, so that the Miller cycle is realized, and the oil consumption of the engine is reduced. The diesel engine aftertreatment conversion efficiency has higher requirement on exhaust temperature, the engine exhaust temperature is low under the working condition of cold start or small load of the engine, the aftertreatment conversion efficiency is low, and the exhaust temperature of the engine can be improved, the aftertreatment conversion efficiency is improved and the engine emission is improved through an exhaust valve early opening technology.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A variable valve control apparatus, characterized by comprising:
the air valve comprises a piezoelectric module, a displacement amplification module and an electromagnetic driving module, wherein the piezoelectric module is arranged at the top of the air valve, the displacement amplification module is arranged below the piezoelectric module, the electromagnetic driving module is connected below the displacement amplification module, and the electromagnetic driving module is arranged at the bottom of the air valve;
the piezoelectric module drives the valve to be in a closed state to an open state, and after the valve is opened, the electromagnetic driving module drives the valve to reach a preset state matched with the working condition requirement of an engine;
the displacement amplification module comprises a piston, the upper diameter and the lower diameter of the piston are different in size, and hydraulic oil is filled in the upper cavity and the lower cavity of the piston to form a closed displacement amplification module;
the electromagnetic driving module comprises an electromagnetic coil and a valve spring;
wherein the displacement amplification module further comprises: the hydraulic control system comprises a first oil inlet, a second oil inlet, a first control cavity, a second control cavity, a third control cavity and an electromagnetic valve, wherein hydraulic oil enters the second control cavity and the third control cavity through the first oil inlet and the second oil inlet respectively, the first control cavity is communicated with the third control cavity through an oil duct on a piston, an oil outlet is formed in the second control cavity, and oil drainage of the oil outlet is controlled by the electromagnetic valve at any time.
2. A variable valve control method applied to the variable valve control apparatus according to claim 1, the method comprising:
determining a valve lift requirement according to the working condition and the functional requirement of the engine;
determining a driving control mode according to the valve lift requirement, wherein the driving control mode comprises a piezoelectric driving control mode and a hybrid driving control mode, the piezoelectric driving control mode drives the piezoelectric module to work, and the hybrid driving control mode drives the piezoelectric module and the electromagnetic driving module to work;
and according to the driving control mode, carrying out lift and current double-closed-loop control on the variable valve control device, and realizing timing and lift control on the valve.
3. The method of claim 2, wherein the functional requirements of the engine include one or more of:
thermal management requirements, miller cycle requirements, exhaust braking requirements, and cylinder deactivation fuel cut requirements.
4. The method of claim 2, wherein said determining a drive control mode based on said valve lift demand comprises:
and judging whether a piezoelectric driving preset condition is met or not according to the valve lift requirement, if so, determining the driving control mode as a piezoelectric driving control mode, otherwise, determining the driving control mode as a hybrid driving control mode, wherein the piezoelectric driving preset condition comprises that the air quantity requirement is smaller than a first threshold value or the lift is smaller than a second threshold value.
5. The method according to claim 2, wherein the performing lift and current double closed loop control of the variable valve control apparatus according to the drive control mode includes:
calculating to obtain a lift set value according to the rotating speed and the load of the engine;
comparing the actual lift value fed back by the variable valve control device with the set lift value to obtain a comparison result;
adjusting the lift according to the comparison result to realize the lift closed-loop control of the variable valve control device;
converting actual current and target current of the variable valve control device into duty ratio according to the characteristic relation between piezoelectric deformation lift and current of a piezoelectric module in the variable valve control device;
and adding a correction coefficient to the duty ratio for adjustment, adjusting the actual current according to the adjusted duty ratio to obtain the actual lift, and realizing the current closed-loop control of the variable valve control device.
6. The method of claim 3, further comprising:
if the functional requirement of the engine is a thermal management requirement or a Miller cycle requirement, adopting intake valve timing control on the variable valve control device;
if the functional requirement of the engine is an exhaust braking requirement, judging whether an intake valve needs to be opened for the second time, if so, adopting intake valve lift control on the variable valve control device, otherwise, adopting exhaust valve timing control;
and if the functional requirement of the engine is the cylinder deactivation and fuel cut-off requirement, determining the number of cylinder deactivation and the cylinder number according to the load and the running condition of the whole vehicle, and performing lift control on the exhaust valve with the determined cylinder number.
7. The method of claim 3, further comprising:
the functional requirements of the engine are determined based on the state of the engine.
8. The method of claim 7, wherein determining a functional requirement of the engine based on the state of the engine comprises:
if the engine is in cold start or meets preset load exhaust temperature, determining that the function requirement of the engine is a heat management requirement;
if the engine runs in a preset efficiency interval, determining that the function requirement of the engine is a Miller cycle requirement, wherein the Miller cycle requirement ensures that an expansion stroke is larger than a compression stroke;
if the whole vehicle needs exhaust auxiliary braking, determining that the function requirement of the engine is an exhaust braking requirement;
and if the whole vehicle or the engine needs to adopt cylinder deactivation and oil cut, determining that the functional requirement of the engine is the cylinder deactivation and oil cut requirement.
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| CN201811331006.1A CN109404141B (en) | 2018-11-09 | 2018-11-09 | Variable valve control device and method |
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| CN201811331006.1A CN109404141B (en) | 2018-11-09 | 2018-11-09 | Variable valve control device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852676B (en) * | 2019-04-28 | 2022-06-28 | 联合汽车电子有限公司 | Method and system for controlling self-learning of continuous variable valve lift system |
| CN110985157B (en) * | 2019-12-25 | 2021-05-18 | 潍柴动力股份有限公司 | Exhaust brake system, control method thereof and vehicle |
| CN112392785B (en) * | 2020-11-12 | 2022-09-20 | 天津大学 | Servo driving system for fuel booster pump and exhaust valve of low-speed diesel engine |
| CN113266443A (en) * | 2021-06-24 | 2021-08-17 | 中国第一汽车股份有限公司 | Valve structure, engine thermodynamic cycle control system and method |
| CN114483331B (en) * | 2022-01-21 | 2022-12-09 | 重庆长安汽车股份有限公司 | Control method of variable valve lift system |
| CN114623008B (en) * | 2022-03-21 | 2023-05-23 | 潍柴动力股份有限公司 | Diesel engine control method, device and system |
| CN115573822B (en) * | 2022-10-10 | 2024-06-18 | 北京理工大学 | Tracking control method of electrohydraulic variable valve actuating mechanism on valve molded line characteristics |
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| JP2005351139A (en) * | 2004-06-09 | 2005-12-22 | Toyota Motor Corp | Variable valve mechanism of engine |
| CN105156166A (en) * | 2015-08-17 | 2015-12-16 | 天津大学 | Piezo-electric crystal electronic control hydraulic rapid VVT and VVL device and control method thereof |
| CN105257357A (en) * | 2015-08-17 | 2016-01-20 | 天津大学 | Double piezoelectric crystal electric-controlled rapid air valve variavle valve timing (VVT) and variavle valve lift (VVL) device and control method |
| CN205654389U (en) * | 2016-04-11 | 2016-10-19 | 浙江师范大学 | Piezoelectricity driven does not have camshaft valve actuating mechanism |
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| US6789777B2 (en) * | 2002-12-02 | 2004-09-14 | Caterpillar Inc | Piezo solenoid actuator and valve using same |
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| JP2005351139A (en) * | 2004-06-09 | 2005-12-22 | Toyota Motor Corp | Variable valve mechanism of engine |
| CN105156166A (en) * | 2015-08-17 | 2015-12-16 | 天津大学 | Piezo-electric crystal electronic control hydraulic rapid VVT and VVL device and control method thereof |
| CN105257357A (en) * | 2015-08-17 | 2016-01-20 | 天津大学 | Double piezoelectric crystal electric-controlled rapid air valve variavle valve timing (VVT) and variavle valve lift (VVL) device and control method |
| CN205654389U (en) * | 2016-04-11 | 2016-10-19 | 浙江师范大学 | Piezoelectricity driven does not have camshaft valve actuating mechanism |
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