CN109611205A - Four-stroke engine method for detecting phases based on valve actuating mechanism rocker arm position detection - Google Patents
Four-stroke engine method for detecting phases based on valve actuating mechanism rocker arm position detection Download PDFInfo
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- CN109611205A CN109611205A CN201811436921.7A CN201811436921A CN109611205A CN 109611205 A CN109611205 A CN 109611205A CN 201811436921 A CN201811436921 A CN 201811436921A CN 109611205 A CN109611205 A CN 109611205A
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- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000013459 approach Methods 0.000 claims abstract description 4
- 206010055001 Hypodontia Diseases 0.000 claims description 40
- 206010002583 anodontia Diseases 0.000 claims description 40
- 230000005213 hypodontia Effects 0.000 claims description 40
- 201000006680 tooth agenesis Diseases 0.000 claims description 40
- 230000000630 rising effect Effects 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 210000001367 artery Anatomy 0.000 claims 1
- 210000003462 vein Anatomy 0.000 claims 1
- 230000006698 induction Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 230000004087 circulation Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005307 ferromagnetism Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The present invention relates to a kind of four-stroke engine method for detecting phases based on valve actuating mechanism rocker arm position detection, include the following steps: that (1) acquisition rocker arm pulse signal fixes an inductance approach switch as the rocker arm position sensor to detect engine rocker swing on the top of the chamber cap of the rocker arm of driving inlet valve, the rocker arm pulse signal of reflection engine operating cycle location information is generated, rocker arm pulse signal is used to determine engine is in which week of two crankshaft swing circles of a working cycles；(2) detection crankshaft fluted disc generates CRANK PULSES signal.(3) real-time phase information of engine operation is obtained according to rocker arm pulse signal and CRANK PULSES signal.
Description
Technical field
The invention belongs to four-stroke engine electric control fields, are related to a kind of method for detecting phases of four-stroke engine.
Background technique
Engine phase position detection is the core content of engine electric-controlled system, is to realize engine oil spout and time of ignition spirit
The basis living accurately controlled.One duty cycle of four-stroke engine includes four air inlet, compression, acting, exhaust strokes, is corresponded to
Two crankshaft swing circles totally 720 ° of crank angles, while also corresponding to a camshaft swing circle or valve actuating mechanism
One period of motion of the moving components such as tappet, rocker arm, valve.Want the oil spout time of ignition of accurate control engine, thus
Dynamic property, economy and the emission performance of engine are promoted, the operation phase of the necessary real-time monitoring engine of control system is grasped
Exact position of each moment engine in the duty cycle.
The electric-control system of early stage is only equipped with crankshaft position sensor, can only provide the crank phase letter of 360 ° of crank angles
Breath, control system cannot obtain the complete phase information of engine entire duty cycle, to not can determine that a certain gas of engine
Cylinder is to be in expansion stroke and exhaust stroke in induction stroke and compression stroke.The injection system of engine is logical at this time
Frequently with inlet manifold's single point injection or air intake duct bank injection；Ignition system generallys use grouping ignition system, in compression
Nearby each igniting is primary for stop and exhaust top dead center, and wherein exhaust top dead center is invalid igniting.Such electric-control system there is
Control the problems such as flexibility is poor, each cylinder is uneven, energy content of battery waste, and the control of not competent in-cylinder direct-jet injection system
It is required that.
In order to obtain the complete phase information of the entire working cycles of four-stroke engine, traditional method is in crankshaft one end
Metal fluted disc is installed, is uniformly distributed dozens of tooth thereon, and by hypodontia or multiple tooth mark crank position, while in camshaft one
Another monodentate or multiple tooth metal fluted disc are installed in end, measure crankshaft by crankshaft and CMPS Camshaft Position Sensor and camshaft location is believed
Number, it is sent into the electronic control unit of engine, to obtain the complete phase information of four-stroke engine.
Although the phase information of four-stroke engine can be effectively detected in traditional engine phase position detection method, exist
Application cost and applicability problem.Especially for certain compact-sized engines, the driving gear of camshaft is encapsulated
Inside crankcase, there is a problem of with existing method to the progress EFIization transformation of this kind of engine very big.Using only detecting
The early stage electric-control system of crank phase signal, flexibility and the energy-saving and emission-reduction that cannot give full play to electronic control injection ignition system are excellent
Gesture；And camshaft fluted disc combination CMPS Camshaft Position Sensor is used to generate camshaft-position signal to detect four-stroke engine
The method of full duty cycle phase, needs the structural member and transmission important to the crankcase, transmission gear, camshaft of engine etc.
Part is redesigned, at high cost, and the period is long, also will increase the overall weight of engine.Therefore it needs to design four new strokes
Engine phase position detection system realizes that four-stroke engine work follows using the mode for not changing engine body structure as far as possible
Ring phase-detection.
Summary of the invention
In order to solve certain non-automatically controlled four-stroke engine when carrying out automatically controlledization transformation, since camshaft is encapsulated in song
Inside axle box, it is difficult to camshaft-position signal is collected, so that complete four-stroke engine phase information cannot be detected
Problem, the present invention improve camshaft-position signal acquisition method, provide a kind of new four-stroke engine method for detecting phases.Skill
Art scheme is as follows:
A kind of four-stroke engine method for detecting phases based on valve actuating mechanism rocker arm position detection, including the following steps:
(1) rocker arm pulse signal is acquired
It fixes an inductance approach switch on the top of the chamber cap of the rocker arm of driving inlet valve and is used as and start to detect
The rocker arm position sensor that machine rocker arm is swung generates the rocker arm pulse signal of reflection engine operating cycle location information, rocker arm
Pulse signal is used to determine engine is in which week of two crankshaft swing circles of a working cycles；
(2) detection crankshaft fluted disc generates CRANK PULSES signal, and the relative position of crankshaft position sensor and crankshaft fluted disc makes
Hypodontia signal θ before top dead center position is obtained, θ is a fixed value less than 90 °.
(3) according to rocker arm pulse signal and CRANK PULSES signal obtain engine operation real-time phase information, comprising with
Lower step:
1) rising edge of rocker arm pulse signal is detected, engine is in a certain phase among IO Intake Valve Opens process at this time
Position；
2) detect the failing edge of CRANK PULSES signal, first judge between the failing edge signal and a upper failing edge whether
There are hypodontias, if illustrating that engine rotation is lacked to crankshaft disk there are hypodontia between two adjacent CRANK PULSES signal failing edges
First triggering tooth failing edge position after tooth remembers that the signal is hypodontia signal, then judges that the hypodontia signal and a upper hypodontia are believed
It whether there is rocker arm pulse signal rising edge between number, if illustrated between two hypodontia signals there are pulse signal rising edge
The distance beta of the hypodontia signal and a upper rocker arm pulse signal less than 360 °, and hypodontia signal location be fixed on top dead centre it
Preceding θ, and 90 ° of θ < may thereby determine that the hypodontia signal location is before compression top center at θ degree, i.e. engine phase position at this time
For 720 ° of-θ；If pulse signal rising edge is not present between two hypodontia signals, illustrate the hypodontia signal and a upper rocker arm
The distance beta of pulse signal is greater than 360 °, may thereby determine that the hypodontia signal location is to send out at this time before exhaust top dead center at θ
Motivation phase is 360 ° of-θ；If hypodontia is not present between two adjacent CRANK PULSES signal failing edges, pass through hypodontia signal phase
Position and the failing edge number between the CRANK PULSES signal failing edge and hypodontia signal determine the phase of engine at this time.
3) between two CRANK PULSES signal failing edges higher resolution real-time phase information CAD, calculate according to the following formula
It obtains:
CAD=CADR+V*T
Wherein CADR is with reference to engine phase position, and V is engine speed, and T is that current time and the pulse of last track axis decline
Time interval between.
The present invention obtains rocker arm position signal using rocker arm position sensor detection engine rocker position, to substitute biography
Camshaft-position signal in system method, to determine the phase information of engine.Compared to traditional four-stroke engine phase
Detection system, the four-stroke engine phase detection structure is simple, easy for installation, small in size, light-weight, without additional fortune
Dynamic component.It is redesigned when carrying out reformation of electric control to engine without the primary structure to engine.Suitable for various
Camshaft is underlying, in set, have the four-stroke engine of tappet rocker structure, be particularly suitable for being not easy to that tooth is installed on camshaft
The four-stroke engine of disk and sensor.
Detailed description of the invention
Fig. 1 is sensor of the invention schematic view of the mounting position.
A illustrates the linked manner of engine valve actuating mechanism main motion parts and the peace of rocker arm position sensor in figure
Holding position；B illustrates the appearance and relative mounting location of crankshaft fluted disc and crankshaft sensor.
Fig. 2 is phase-detection operation principle schematic diagram of the invention.
Fig. 3 is signal handler flow chart of the invention.
Number explanation in attached drawing: 1- admission cam, 2- tappet, 3- tappet, 4- rocker arm, 5- rocker arm shaft, 6- inlet valve, 7- shake
Arm chamber cap, 8- clamp nut, 9- rocker arm position sensor (close to switch), 10- crankshaft fluted disc, 11- crankshaft position sensor.
Specific embodiment
The installation site and working method of rocker arm position sensor 9 main body of rocker arm position sensor as shown in Fig. 1 are one
There are M12*1.5 external screw thread in a screw shaped object, outside, and upper end connection power supply and signal cable, lower end are induction planes.Rocker arm chamber
Lid 7 is equipped with cylindrical mounting base, and there are M12*1.5 internal thread through hole at center, and rocker arm position sensor is by being threaded into
Mounting base, and can be adjusted by the thread the gap of sensor sensing plane Yu Rocker arm 4 upper surface, when installation, will be shown in Fig. 1-A
Gap under valve-closing state is adjusted to 8mm, and sensor is pressed in mounting base by locking nut 8 later.
Rocker arm position sensor 9 is an inductance approach switch, when there are ferromagnetism objects within the scope of its induction planes 2mm
When body, sensor signal lines export high potential, otherwise export low potential.
When engine is run, the admission cam 1 on camshaft is rotatable around its axis, and drives tappet 2 and tappet 3 along each
It moves up and down from axis, and then Rocker arm 4 is pushed to swing up and down around rocker arm shaft 5, it is final to drive IO Intake Valve Opens and closing.Four strokes
In one working cycles of engine, for the motion conditions of inlet ram as shown in inlet ram lifting curve in Fig. 2, the curve is also anti-
It has reflected Rocker arm 4 and has swung up and down position close to tappet one end.In 3 uphill process of tappet, Rocker arm 4 left end and rocker arm position sensing
The distance of the induction planes of device 9 reduces, and when rocker arm left end enters in the induction range of sensor, sensor output signal is by low
Jump in potential is high potential, and when induction range of the rocker arm left end far from sensor, sensor output signal is jumped by high potential
For low potential, rocker arm pulse signal as shown in Figure 2 is formed.
As shown if figure 1-b, the crankshaft-position signal generating device of the phase detection and traditional phase detection
It is almost the same, it is not fundamental novel features of the invention, only briefly describes herein.Fig. 1-B is crankshaft fluted disc 10 and crankshaft position
Set the appearance of sensor 11 and the relative position schematic diagram of installation.Fluted disc is evenly distributed with 30 triggering teeth, removes 1 hypodontia as crankshaft
Position mark, there are 29 triggering teeth, each triggering tooth corresponds to 360/30=12 crank angle degrees.Crankshaft position sensor 11 is felt
It answers crankshaft fluted disc 10 to rotate, CRANK PULSES signal as shown in Figure 2 is generated through signal processing.
As shown in figure 3, signal processing software process of the invention is divided at three parts, including main program, rocker arm signal
Manage module and crankshaft signal processing module.Wherein main program is responsible for initializing each interrupt source and general register, then
The real-time phase of engine operation is calculated in major cycle and generates oil spout and the ignition control signal of engine on this basis.
Rocker arm signal processing module is mainly responsible for processing rocker arm pulse signal, and the rising edge of rocker arm pulse signal, which triggers, to interrupt
Circulation position register n is assigned a value of 1 by processing routine, so that engine be marked to be in induction stroke.
Crankshaft signal processing module is responsible for handling CRANK PULSES signal, and generates the reference phase of crankshaft triggering tooth falling edge
Position.It often detects a failing edge signal, first detects between the signal and a upper signal with the presence or absence of hypodontia.If do not lacked
Within tooth then illustrates that crankshaft has turned over 12 °, and the value of crank position register m is increased by 12 at this time, and the angle 12 that will be turned over is removed
The value T of portion's time timer obtains engine speed V at this time.If there is hypodontia then illustrates that crankshaft has turned over 24 °, hypodontia is reached
Crank position register m is assigned a value of 0 at this time by the crank position marked, and label crankshaft is in edentulous site, while will circulation
The value of location register n adds 1, shows that engine is recycled into next crankshaft, and the engine speed V calculated at this time is 24/
T.Then the reference engine phase position of the falling edge is calculated
CADR=(m+n*360- θ) mod720
Wherein the value of crank position register m represents current CRANK PULSES failing edge and declines relative to a upper hypodontia signal
Along the crank angle turned over；The value of circulation position register n represents engine at this time and is in two weeks crankshaft circulations in working cycles
Which week, as shown in Fig. 2, due to after detecting pulse signal rising edge n be assigned 1, rocker arm pulse signal
Rising edge to n=1 between the failing edge of the latter crankshaft hypodontia signal, the rising edge of rocker arm pulse signal to previous crankshaft
N=3 between the failing edge of hypodontia signal, remaining position n=2；θ indicates hypodontia signal failing edge mentioning relative to top dead center position
Anterior angle.Timer internal resetting is finally made into T=0.
After jumping out CRANK PULSES signal interruption processing program, main program calculates real time engine phase in major cycle
CAD=CADR+V*T
Wherein CADR is the reference engine phase position generated in CRANK PULSES signal handler, and V is engine speed, with
Average speed between upper two CRANK PULSES failing edges represents the real-time speed of engine, and T is the timer internal time, represents
Time interval between last track axis pulse falling edge at this time.
Signal processing software flow chart in Fig. 3 is only used to show by input pulse signal generation real time engine phase
The Integral Thought of information, specific procedure are related to the other function of particular hardware system and realization that control unit uses.
Claims (1)
1. a kind of four-stroke engine method for detecting phases based on valve actuating mechanism rocker arm position detection, including the following steps:
(1) rocker arm pulse signal is acquired
It fixes an inductance approach switch on the top of the chamber cap of the rocker arm of driving inlet valve and is used as and shake to detect engine
The rocker arm position sensor of arm swing generates the rocker arm pulse signal of reflection engine operating cycle location information, rocker arm pulse
Signal is used to determine engine is in which week of two crankshaft swing circles of a working cycles；
(2) relative position of detection crankshaft fluted disc generation CRANK PULSES signal, crankshaft position sensor and crankshaft fluted disc to lack
Tooth the signal θ before top dead center position, θ are a fixed value less than 90 °.
(3) real-time phase information of engine operation is obtained according to rocker arm pulse signal and CRANK PULSES signal, includes following step
It is rapid:
1) rising edge of rocker arm pulse signal is detected, engine is in a certain phase among IO Intake Valve Opens process at this time；
2) it detects the failing edge of CRANK PULSES signal, first judges to whether there is between the failing edge signal and a upper failing edge
Hypodontia, if there are hypodontias between two adjacent CRANK PULSES signal failing edges, after illustrating engine rotation to crankshaft disk hypodontia
First triggering tooth failing edge position remembers that the signal is hypodontia signal, then judge the hypodontia signal and a upper hypodontia signal it
Between whether there is rocker arm pulse signal rising edge, if there are pulse signal rising edge between two hypodontia signals, illustrate this lack
The distance beta of tooth signal and a upper rocker arm pulse signal is less than 360 °, and hypodontia signal location is fixed on θ before top dead center,
And 90 ° of θ <, it may thereby determine that the hypodontia signal location is before compression top center at θ degree, i.e., engine phase position is at this time
720°-θ；If pulse signal rising edge is not present between two hypodontia signals, illustrate the hypodontia signal and a upper rocker arm arteries and veins
The distance beta for rushing signal is greater than 360 °, may thereby determine that the hypodontia signal location is to start at this time before exhaust top dead center at θ
Machine phase is 360 ° of-θ；If hypodontia is not present between two adjacent CRANK PULSES signal failing edges, pass through hypodontia signal phase
And the failing edge number between the CRANK PULSES signal failing edge and hypodontia signal determines the phase of engine at this time.
3) between two CRANK PULSES signal failing edges higher resolution real-time phase information CAD, be calculated according to the following formula:
CAD=CADR+V*T
Wherein CADR is with reference to engine phase position, and V is engine speed, T be current time and last track axis pulse falling edge it
Between time interval.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811436921.7A CN109611205B (en) | 2018-11-28 | 2018-11-28 | Four-stroke engine phase detection method based on valve train rocker arm position detection |
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| CN201811436921.7A CN109611205B (en) | 2018-11-28 | 2018-11-28 | Four-stroke engine phase detection method based on valve train rocker arm position detection |
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| CN109611205A true CN109611205A (en) | 2019-04-12 |
| CN109611205B CN109611205B (en) | 2020-12-25 |
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Cited By (2)
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| CN111852674A (en) * | 2020-06-22 | 2020-10-30 | 潍柴动力股份有限公司 | Monitoring control device and monitoring method of valve mechanism |
| CN113931742A (en) * | 2021-09-29 | 2022-01-14 | 上海海事大学 | Diesel engine connecting rod bearing temperature monitoring device and monitoring method |
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Cited By (4)
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| CN111852674A (en) * | 2020-06-22 | 2020-10-30 | 潍柴动力股份有限公司 | Monitoring control device and monitoring method of valve mechanism |
| CN111852674B (en) * | 2020-06-22 | 2022-04-26 | 潍柴动力股份有限公司 | Monitoring control device and monitoring method of valve mechanism |
| CN113931742A (en) * | 2021-09-29 | 2022-01-14 | 上海海事大学 | Diesel engine connecting rod bearing temperature monitoring device and monitoring method |
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| Publication number | Publication date |
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| CN109611205B (en) | 2020-12-25 |
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