CN108894844A - It takes a seat the full variable valve control system of buffer-type electromagnetism and method - Google Patents

It takes a seat the full variable valve control system of buffer-type electromagnetism and method Download PDF

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Publication number
CN108894844A
CN108894844A CN201810562566.1A CN201810562566A CN108894844A CN 108894844 A CN108894844 A CN 108894844A CN 201810562566 A CN201810562566 A CN 201810562566A CN 108894844 A CN108894844 A CN 108894844A
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China
Prior art keywords
valve
buffer unit
variable damping
seat
ecu
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CN201810562566.1A
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CN108894844B (en
Inventor
刘梁
朱祥彬
徐照平
郭贺
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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Classifications

    • 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
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • 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
    • 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
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
    • F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
    • F01L2009/2103—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids comprising one coil
    • 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
    • F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
    • F01L2009/2151—Damping means
    • 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)
  • Magnetically Actuated Valves (AREA)

Abstract

It takes a seat buffer-type electromagnetism full changeable air valve control method the present invention provides one kind, quick deceleration stage for valve and stablizes the stage of taking a seat and implement the steps of：In the quick deceleration stage, it acquires valve and reaches peak velocity, valve deceleration distance, default valve quick deceleration target velocity, change the speed of valve as ECU damping force according to caused by different peak velocity calculating variable damping buffer units, the periodically real-time speed of acquisition valve, if the real-time speed of valve is equal to default valve quick deceleration target velocity, electromagnetic force is withdrawn from；It takes a seat the stage in stabilization：Acquire valve between valve seating at a distance from, if variable damping buffer unit governor circuit voltage is reduced to zero by ECU in default range.

Description

It takes a seat the full variable valve control system of buffer-type electromagnetism and method
Technical field
The present invention relates to a kind of internal-combustion engine technology, especially one kind take a seat the full variable valve control system of buffer-type electromagnetism and Method.
Background technique
Using one of the design of the engine of the full changeable air valve of electromagnetism and its forward position of electron controls technology research.Engine Using the full changeable air valve of electromagnetism, Grazing condition control is carried out to inlet valve and exhaust valve respectively by engine electric-controlled unit, is realized The independence of the lift of engine valve, valve timing angle and its characteristics of motion is continuously adjustable.Its main problem faced first is that Air valve drop is difficult to realize " soft landing " problem, to generate air valve drop impact, leads to larger noise and to reduce valve gentle The seat ring service life, or even also result in valve and acutely spring back, it influences valve and closes in time, lead to vehicle launch difficulty, accelerate nothing Situations such as power, occurs.For traditional cam valve train, cam profile passes through stiffener (such as tappet and roller rocker arms) It is transmitted to valve, the seating velocity of valve is controlled by the method that cam profile optimizes.And the full changeable air valve of electromagnetism is a kind of nothing Cam structure can not constrain valve crash speed by cam profile.In entire electromagnetic drive valve actuating mechanism, valve Movement by engine management system real-time control, but due to valve operation bad environments, accurately control band to valve Great difficulty is carried out, buffering of effectively taking a seat need to have been carried out by external device (ED).
Summary of the invention
It takes a seat the full variable valve control system of buffer-type electromagnetism and method the purpose of the present invention is to provide one kind.
Realize the object of the invention technical solution be：One kind is taken a seat the full variable valve control system of buffer-type electromagnetism, including Variable damping buffer unit, electronic control unit, governor circuit, linear actuator；Variable damping buffer unit include shell, piston, coil, Piston rod, shell is interior to be arranged magnetorheological fluid, and piston is set in shell, and piston rod connects piston and external valve；Automatically controlled list Member includes ECU, and the two current sense modules, displacement sensing module and the driving circuit that are electrically connected with ECU, and the first electric current passes Sense module also in variable damping buffer unit coil and solenoid valve be electrically connected, the second current sense module also with linear actuator Electrical connection, unique sensing module are also electrically connected with linear actuator；Driving circuit is also connect with governor circuit.
One kind is taken a seat buffer-type electromagnetism full changeable air valve control method, and quick deceleration stage and stabilization for valve take a seat Stage implements the steps of：
The quick deceleration stage：
It acquires valve and reaches peak velocity, valve deceleration distance, preset valve quick deceleration target velocity；By ECU according to Different peak velocities calculates the speed that damping force caused by variable damping buffer unit changes valve, and ECU is big according to damping force Electric current in small control variable damping buffer unit electromagnetic coil, the magnetic field that electromagnetic coil generates changes the physical property of magnetorheological fluid And then provide the damping force contrary with valve motion；The periodically real-time speed of acquisition valve, if the real-time speed of valve Equal to default valve quick deceleration target velocity, electromagnetic force is withdrawn from；
Stabilization is taken a seat the stage：
Acquire valve between valve seating at a distance from, if in default range, ECU is by variable damping buffer unit governor circuit Voltage is reduced to zero.
Compared with prior art, the present invention its remarkable advantage is：(1) the full changeable air valve of engine application electromagnetism, Ke Yishi The existing full softening of inlet and exhaust valve accurately controls, and makes full use of quick rheological behavior of the magnetorheological fluid in magnetic field, according to difference Work requirements under load, by the coordinated control to electromagnetic force and damping force, so that air valve drop is buffered, and can Meet the requirement of valve quick response；(2) step control is carried out by the control electric current to variable damping buffer unit, for a certain Valve peak velocity loads fixed current to it, is fed back by current sensor, carries out electric current stability contorting, has fully considered change The latency issue of the strong non-linear relation and curent change of damping buffer unit electric current and damping force；(3) auxiliary by electromagnetic force Deceleration is helped, to buffer unit control without adding additional force snesor, without complicated closed loop control algorithm.
Present invention is further described in detail with reference to the accompanying drawing.
Detailed description of the invention
Fig. 1 is buffer control system module map of taking a seat.
Fig. 2 is that electromagnetic air valve drop buffers work flow diagram.
Fig. 3 is peak velocity and load damping force relationship flow chart.
Fig. 4 is to take a seat to buffer governor circuit figure.
Specific embodiment
In conjunction with Fig. 1, one kind is taken a seat the full variable valve control system of buffer-type electromagnetism, including variable damping buffer unit 40, electricity Control unit 10, governor circuit 30, linear actuator 30.
Variable damping buffer unit 40 includes shell, piston, coil, piston rod, and magnetorheological fluid, piston setting are arranged in shell In in shell, piston rod connects piston and external valve.
Electronic control unit 10 includes ECU12, and the two current sense modules, the displacement sensing module that are electrically connected with ECU12 14 and driving circuit 15, the first current sense module 13 also in variable damping buffer unit 40 coil and solenoid valve be electrically connected, Second current sense module 11 is also electrically connected with linear actuator, and displacement sensing module 14 is also electrically connected with linear actuator 30. Driving circuit 15 is also connect with governor circuit 30.Governor circuit 30 includes full-bridge circuit 21 and BUCK circuit 22, BUCK circuit 22 Input terminal connect with driving circuit 15 and output end is electrically connected with the coil of variable damping buffer unit 40 and solenoid valve, full-bridge electricity The input terminal on road 21 is electrically connected with driving circuit 15 and output end is electrically connected with linear actuator 30.
Governor circuit is as shown in Figure 4.
Engine valve is opened or closed by solenoid-driven, before valve runs to valve seating, when preparation is taken a seat, to The coil of variable damping buffer unit is powered；It, can be slow in variable damping when variable damping buffer unit coil reaches specified current The magnetic field of a predefined size is generated inside flushing device；Magnetic field caused by variable damping buffer unit coil can buffer variable damping Liquid in device has an impact, and it is a type that variable damping buffer unit internal liquid affected by magnetic fields can change from liquid condition Solid state；The variation of variable damping buffer unit internal liquid physics condition can make variable damping buffer unit slow to variable damping Flushing device piston 2 provides one and moves contrary reversed damping force.
In conjunction with Fig. 2, one kind is taken a seat buffer-type electromagnetism full changeable air valve control method, quick deceleration stage for valve and The stable stage of taking a seat implements the steps of：
First stage：The quick deceleration stage
(1) after valve displacement sensor 14 acquires valve arrival peak velocity, start quick deceleration process.
(2) valve displacement sensor 14 acquires valve speed, valve deceleration distance, and presets and take a seat commencing speed (i.e. Quick deceleration target velocity).
(3) ECU12 calculating reaches default real-time deceleration needed for commencing speed of taking a seat.
(4) size of the damping force according to caused by different peak velocity decision variable damping buffer units 40, ECU12 are logical The electric current in control 40 coil of variable damping buffer unit of BUCK circuit 22 in governor circuit 20 is crossed, damping force is generated, is quick Decelerating phase provides the first deceleration, and immobilizes.It is electric from current sensor 13 to ECU12 feedback buffer unit electromagnetic coil Stream carries out electric current stability contorting by ECU12.
In conjunction with Fig. 3, (4) peak velocity is with damping force corresponding method：The peak velocity range of valve is divided into three Stage, respectively the first threshold values speed, the second threshold values speed, third threshold values speed.It is corresponding, the electricity of buffer unit 40 Magnet-wire loop current is also classified into the first threshold current, the second threshold current, third threshold current.If peak velocity is greater than the first threshold values Speed, ECU12 lead to upper first threshold current to 40 electromagnetic coil of buffer unit, provide larger damping force；If peak velocity is greater than Second threshold values speed, less than the first threshold values speed, ECU12 leads to upper second threshold current to 40 electromagnetic coil of buffer unit, provides Medium damping force.If peak velocity is greater than third threshold values speed, less than the second threshold values speed, ECU12 gives buffer unit electromagnetic wire The logical upper third threshold current of circle, provides smaller damping force.
(5) compare required deceleration and the first deceleration size in (4) in (3).Passed through in governor circuit 20 by ECU12 Full-bridge circuit 21 is subject to reverse current to linear actuator 30, generates electromagnetic force, provides the second deceleration for the quick deceleration stage Degree compensates the first deceleration, valve motion is allowed to be able to satisfy required deceleration.
(6) linear actuator electric current is fed back from current sensor 11 to ECU12, ECU12 realizes that closed loop is flexible to electromagnetic force Control constantly finely tunes electromagnetic force, repeats step (5), makes actual deceleration degree and required deceleration in the same size as far as possible.
(7) valve displacement sensor 14 acquires valve speed and rapidly drops to default commencing speed of taking a seat, quick deceleration rank Section terminates.
Second stage：Stabilization is taken a seat the stage
(1) ECU12 closes full-bridge circuit 21 by governor circuit 20, withdraws from electromagnetic force, and damping force immobilizes, individually slow Punching.
(2) valve displacement sensor 14 acquires displacement signal, when valve will take a seat, needs to withdraw from damping force, due to resistance Time response time of the step decrease of Buddhist nun's power is longer, and current step declines zero setting in 40 electromagnetic coil of variable damping buffer unit Before, need ECU12 to apply a Reverse Turning Control voltage to BUCK circuit 22, to offset variable damping buffer unit magnet exciting coil remanence The influence of field.
(3) ECU12 controls voltage to BUCK circuit 22 and is reduced to zero, so that BUCK circuit 22 is exported the decline of electric current fast step and sets Zero, thus quick closedown buffer unit.
(4) buffering of taking a seat terminates.

Claims (7)

  1. The full variable valve control system of buffer-type electromagnetism 1. one kind is taken a seat, which is characterized in that including variable damping buffer unit, automatically controlled Unit, governor circuit, linear actuator；
    Variable damping buffer unit includes shell, piston, coil, piston rod,
    Magnetorheological fluid is set in shell,
    Piston is set in shell,
    Piston rod connects piston and external valve；
    Electronic control unit includes ECU, and two be electrically connected with ECU current sense module, displacement sensing module and driving circuit,
    First current sense module also in variable damping buffer unit coil and solenoid valve be electrically connected,
    Second current sense module is also electrically connected with linear actuator,
    Unique sensing module is also electrically connected with linear actuator；
    Driving circuit is also connect with governor circuit.
  2. 2. system according to claim 1, which is characterized in that governor circuit includes full-bridge circuit and BUCK circuit,
    The input terminal of BUCK circuit is connect with driving circuit and the coil and solenoid valve of output end and variable damping buffer unit are electrically connected It connects,
    The input terminal of full-bridge circuit is electrically connected with driving circuit and output end is electrically connected with linear actuator.
  3. 3. a kind of full changeable air valve of buffer-type electromagnetism of taking a seat using system described in claim 1 controls method, which is characterized in that Quick deceleration stage and the stable stage of taking a seat for valve implement the steps of：
    The quick deceleration stage：
    It acquires valve and reaches peak velocity, valve deceleration distance, preset valve quick deceleration target velocity；
    Change the speed of valve as ECU damping force according to caused by different peak velocity calculating variable damping buffer units,
    ECU controls the electric current in variable damping buffer unit electromagnetic coil according to damping force size,
    The magnetic field that electromagnetic coil generates changes the physical property of magnetorheological fluid and then provides the damping contrary with valve motion Power；
    The periodically real-time speed of acquisition valve,
    If the real-time speed of valve is equal to default valve quick deceleration target velocity, electromagnetic force is withdrawn from；
    Stabilization is taken a seat the stage：
    Acquire valve between valve seating at a distance from, if in default range, ECU is by variable damping buffer unit governor circuit voltage It is reduced to zero.
  4. 4. according to the method described in claim 3, it is characterized in that, ECU controls the electricity in variable damping buffer unit electromagnetic coil It is constant to flow size.
  5. 5. the method according to claim 3 or 4, which is characterized in that in the quick deceleration stage, periodically acquire valve Real-time speed and required deceleration distance, deceleration needed for calculating, if the gas that the damping force that variable damping buffer unit provides changes Door speed is not equal with required deceleration, and ECU controls linear actuator, and is subject to reverse current, generates and valve motion direction Opposite electromagnetic force.
  6. 6. according to the method described in claim 5, it is characterized in that, different peak velocities is arranged in the quick deceleration stage Range and size of current range, when the peak velocity of valve is in a range, ECU controls variable damping buffer unit electromagnetic coil In the size of electric current be in corresponding range.
  7. 7. according to the method described in claim 3, it is characterized in that, when valve between valve seating at a distance within a preset range, ECU applies an instantaneous Reverse Turning Control voltage to variable damping buffer unit governor circuit.
CN201810562566.1A 2018-06-01 2018-06-01 Seated buffering type electromagnetic fully-variable valve control method Active CN108894844B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110469411A (en) * 2019-08-12 2019-11-19 南京理工大学 A kind of internal combustion engine compression ignition range of operation extension optimization method using changeable air valve
CN110700916A (en) * 2019-11-08 2020-01-17 江苏科技大学 Control system and control method for compound electromagnetic drive fully-variable valve actuating mechanism

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003107523A1 (en) * 2002-03-05 2003-12-24 Sri International Electroactive polymer devices for controlling fluid flow
KR100412737B1 (en) * 2001-12-10 2003-12-31 현대자동차주식회사 Valve system for engine
DE102012015295A1 (en) * 2012-08-01 2014-02-27 Rüdiger Ufermann Electric motor-operated magneto-rheological fluid-actuator for fully variable control of gas exchange valves of piston combustion engines, has piston rod that is positively or non-positively connected with valve shaft
CN104153837A (en) * 2014-07-10 2014-11-19 上海工程技术大学 Novel valve tappet mechanism capable of eliminating valve clearance
DE102014007902A1 (en) * 2014-05-27 2015-12-17 Rüdiger Ufermann Arrangement and method for a fully variable MRF valve control
DE102016002506A1 (en) * 2016-03-01 2017-09-07 Rüdiger Ufermann MRF actuator, in particular for controlling gas exchange valves

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100412737B1 (en) * 2001-12-10 2003-12-31 현대자동차주식회사 Valve system for engine
WO2003107523A1 (en) * 2002-03-05 2003-12-24 Sri International Electroactive polymer devices for controlling fluid flow
DE102012015295A1 (en) * 2012-08-01 2014-02-27 Rüdiger Ufermann Electric motor-operated magneto-rheological fluid-actuator for fully variable control of gas exchange valves of piston combustion engines, has piston rod that is positively or non-positively connected with valve shaft
DE102014007902A1 (en) * 2014-05-27 2015-12-17 Rüdiger Ufermann Arrangement and method for a fully variable MRF valve control
CN104153837A (en) * 2014-07-10 2014-11-19 上海工程技术大学 Novel valve tappet mechanism capable of eliminating valve clearance
DE102016002506A1 (en) * 2016-03-01 2017-09-07 Rüdiger Ufermann MRF actuator, in particular for controlling gas exchange valves

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110469411A (en) * 2019-08-12 2019-11-19 南京理工大学 A kind of internal combustion engine compression ignition range of operation extension optimization method using changeable air valve
CN110700916A (en) * 2019-11-08 2020-01-17 江苏科技大学 Control system and control method for compound electromagnetic drive fully-variable valve actuating mechanism

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