CN103527280B - A kind of controlling method of diesel engine valve timing - Google Patents
A kind of controlling method of diesel engine valve timing Download PDFInfo
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- CN103527280B CN103527280B CN201310482610.5A CN201310482610A CN103527280B CN 103527280 B CN103527280 B CN 103527280B CN 201310482610 A CN201310482610 A CN 201310482610A CN 103527280 B CN103527280 B CN 103527280B
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Abstract
The invention discloses a kind of controlling method of diesel engine valve timing, comprise step: be in compression top center for initial position with piston, by preset direction jiggering, detect the lift of intake valve, exhaust valve in real time; When the lift of described intake valve in closing process equals the first default lift, obtain first corner of flywheel relative to initial position of now motor; When the lift of described exhaust valve in opening process equal second preset lift time, obtain now described flywheel relative to the second corner of initial position; According to described first corner and described second corner, adjust the valve clearance of described motor and/or the position of cam, to make described first corner, the second corner meets the first standard angle range, the second standard angle range respectively.Whether valve at the reference value of corner corresponding to default lift as valve timing, is detected valve timing and meets the requirements, adjust targetedly, make it finally meet the technological requirement of valve timing by the method exactly.
Description
Technical field
The present invention relates to technical field of engines, particularly relate to a kind of controlling method of diesel engine valve timing.
Background technique
As everyone knows, diesel engine is in practical work process, and the opening and closing of intake valve, exhaust valve are not the position being positioned at top dead center or lower dead center at piston, but will open in advance and delayed closedown, reach the object that air inlet is abundant as far as possible, exhaust is clean as far as possible.With crank angle represent intake valve, exhaust valve is opened, moment of closing, be called port timing, the diesel engine of each model has the port timing of oneself, and they are generally determined by experiment when designing, and port timing can represent with valve timing figure.
At present, in diesel engine assembly process, the detecting method of valve timing comprises the steps:
First jiggering is in compression top center position to make piston, mounting process pointer, technique dial, in order to characterize the angle that flywheel turns over, and adjusts pointer and makes it point to " 0 " scale;
The slow jiggering of one people, a people rotates tappet, and in rotation process, stop jiggering when just having resistance to occur, now read current angular from dial, this is the start-up time of intake valve; When resistance just disappears, read current angular from dial, this is the close moment of exhaust valve, and valve timing is verified.
Adopt above-mentioned controlling method, valve timing can be obtained comparatively simply, but, above-mentioned controlling method dependence operator feel to know whether have resistance to occur or resistance disappearance, and individual feel is different, especially for the large-scale diesel engine that valve timing is larger, the testing result deviation of valve timing is larger.
In addition, for large-scale four-cycle diesel, cannot mounting process pointer and dial in assembly process, if conventionally detect by force, need the technique part that makes more, high cost.
In view of this, urgently for above-mentioned technical problem, look for another way a kind of controlling method being suitable for the valve timing of large-scale four-cycle diesel newly of design, to improve the accuracy of testing result, and has lower testing cost.
Summary of the invention
Object of the present invention is for providing a kind of controlling method of diesel engine valve timing, and the method can be applicable to large-scale four-cycle diesel, and its testing result error is little, accuracy good, and has less cost.
For solving the problems of the technologies described above, the invention provides a kind of controlling method of diesel engine valve timing, comprising the steps:
Be in compression top center for initial position with the piston of described motor, according to preset direction jiggering, and detect the lift of intake valve, exhaust valve in real time;
When the lift of described intake valve in closing process equals the first default lift, obtain first corner of flywheel relative to initial position of now motor; When the lift of described exhaust valve in opening process equal second preset lift time, obtain now described flywheel relative to the second corner of initial position;
According to described first corner and described second corner, adjust the valve clearance of described motor and/or the position of cam, to make described first corner, the second corner meets the first standard angle range, the second standard angle range respectively.
Adopt above-mentioned controlling method, can preset when the design process of diesel engine intake valve arrive in closing process first preset lift time, the first standard angle range that flywheel turns over from the initial position that piston is in compression top center, and exhaust valve arrive in opening procedure second preset lift time, the second standard angle range that flywheel turns over from initial position.
For large-scale diesel engine (such as marine diesel engine), because its valve timing angle is too large, therefore measure and from bent axle, to turn to valve just to have started the flywheel corner of action very inconvenient, and working efficiency is very low, precision is also poor.Therefore, above-mentioned first standard angle range and the second standard angle range can as the reference values of the sign valve timing of large-scale diesel engine.The corner corresponding when valve is in default lift when above-mentioned standard angle range, then represents that valve timing meets technological requirement, otherwise represents that valve timing is undesirable, need to readjust.
In concrete control procedure, first choose when piston is in top dead center as the initial position detected, this is because the moment of IO Intake Valve Opens and exhaust valve closing is exactly almost the moment that piston is in compression top center, these two values do not need to measure, and choosing this position is the corner that initial position is convenient to measure more exactly flywheel.Then obtain intake valve, corner that exhaust valve is corresponding when default lift, then using the reference value of this corner as valve timing, adjust the position of valve clearance or cam on this basis, meet reference value to make valve timing.
As can be seen here, above-mentioned controlling method is using the reference value of corner corresponding to default lift for valve as valve timing, detect valve timing accurately, easily and whether meet technological requirement, thus adjust targetedly, make it finally meet the technological requirement of valve timing.This method is suitable for the very large large-scale diesel engine of valve timing, and testing process is simple to operate, and testing result precision is higher, to make final precise control.
Preferably, the first dial gauge, the second dial gauge is adopted to detect the lift of described intake valve, described exhaust valve respectively in real time.
Preferably, according to operative orientation jiggering, when the second dial gauge arrives default lift first, the corner recording described flywheel relative initial position is the second corner; When the first dial gauge second time arrives default lift, the corner recording described flywheel relative initial position is the first corner.
Preferably, when obtaining described first corner or the second corner, first obtain the edge arc length L that described flywheel turns over relative to initial position, then basis
Corner=360*L/S
Calculate the first corner or the second corner, wherein S is the girth of described flywheel.
Preferably, described first presets lift, the described second default lift is 10mm.
Preferably, in jiggering process, when institute's intake valve stroke distances described in first preset lift≤0.5mm time, slow down barring speed, until arrive described first preset lift;
Or when described exhaust valve stroke distances described in second preset lift≤0.5mm, slow down barring speed, until arrive described second preset lift.
Accompanying drawing explanation
Fig. 1 is the FB(flow block) of a kind of embodiment of the controlling method of diesel engine valve timing provided by the present invention.
Embodiment
Core of the present invention is for providing a kind of controlling method of diesel engine valve timing, and the method can measure the valve timing of large-scale four-cycle diesel accurately, strengthens the precision controlled further, and has less cost.
In order to make those skilled in the art understand technological scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1, Fig. 1 is the FB(flow block) of a kind of embodiment of the controlling method of valve timing provided by the present invention.
In a kind of embodiment, as shown in Figure 1, the invention provides a kind of controlling method of valve timing, mainly comprise the steps:
S11: be in compression top center for initial position with the piston of described motor, according to preset direction jiggering, and detects the lift of intake valve, exhaust valve in real time;
S12: judge whether the lift of described intake valve in closing process equals first and preset lift, if so, carries out step S13, if not, performs step S14;
S13: first corner of flywheel relative to initial position obtaining now motor;
S14: keep current state constant;
S15: judge whether the lift of described exhaust valve in opening process equals second and preset lift, if so, performs step S16, if not, performs step S14;
S16: obtain now flywheel relative to the second corner of initial position;
S17: according to described first corner and described second corner, adjust the valve clearance of described motor and/or the position of cam, to make described first corner, the second corner meets the first standard angle range, the second standard angle range respectively.
Adopt above-mentioned controlling method, can preset when the design process of diesel engine intake valve arrive in closing process first preset lift time, the first standard angle range that flywheel turns over from the initial position that piston is in compression top center, and exhaust valve arrive in opening procedure second preset lift time, the second standard angle range that flywheel turns over from initial position.
For large-scale diesel engine (such as marine diesel engine), because its valve timing angle is too large, therefore measure and from bent axle, to turn to valve just to have started the flywheel corner of action very inconvenient, and working efficiency is very low, precision is also poor.Therefore, above-mentioned first standard angle range and the second standard angle range can as the reference values of the sign valve timing of large-scale diesel engine.The corner corresponding when valve is in default lift when above-mentioned standard angle range, then represents that valve timing meets technological requirement, otherwise represents that valve timing is undesirable, need to readjust.
In concrete control procedure, step S11 chooses when piston is in top dead center as the initial position detected, this is because the moment of IO Intake Valve Opens and exhaust valve closing is exactly almost the moment that piston is in compression top center, these two values do not need to measure, and choosing this position is the corner that initial position is convenient to measure more exactly flywheel.Above-mentioned steps S12-S16 obtains intake valve, corner that exhaust valve is corresponding when default lift, and this corner of step S17, as the reference value of valve timing, adjusts the position of valve clearance or cam on this basis, meets reference value to make valve timing.
As can be seen here, above-mentioned controlling method is using the reference value of corner corresponding to default lift for valve as valve timing, detect valve timing accurately, easily and whether meet technological requirement, thus adjust targetedly, make it finally meet the technological requirement of valve timing.This method is suitable for the very large large-scale diesel engine of valve timing, and testing process is simple to operate, and testing result precision is higher, to make final precise control.
The concrete grammar of lift of above-mentioned detection intake valve, exhaust valve can also be set further.
In another kind of embodiment, at the top correct position of the rotating machinery of intake valve, exhaust valve, the first dial gauge, the second dial gauge can be installed respectively, be respectively used to the displacement amount detecting intake valve, exhaust valve.
During use, first returned to zero by the pointer of dial gauge, in the process of the opening and closing of valve, the pointer of dial gauge can represent the lift of valve in real time, and the precision of dial gauge can reach 0.01mm, and validity is higher.Certainly, above-mentioned controlling method can also adopt the higher detection part of dial indicator equally accurate to measure the lift of valve.
In another kind of embodiment, above-mentioned controlling method can according to operative orientation (forward) jiggering in testing process, and when the second dial gauge arrives default lift first, the corner recording described flywheel relative initial position is the second corner; When the first dial gauge second time arrives default lift, record corner position first corner of described flywheel relative initial position.
Like this, in forward jiggering process, due to compression top center position during initial position, therefore first detect when exhaust stroke that exhaust valve reaches second and presets lift in opening procedure, detect that intake valve reaches first and presets lift in closing process again when aspirating stroke, whole procedural order is reasonable, convenient operation.
Certainly, above-mentioned controlling method is not only for the mode adopting forward jiggering, detect in real time, and the mode can also adopt reverse jiggering, detecting in real time, the order just detected is contrary with the stroke order of diesel engine.
In another kind of embodiment, above-mentioned controlling method, when acquisition first corner and the second corner, first can obtain the edge arc length L that described flywheel turns over relative to initial position, then basis
Corner=360*L/S
Calculate the first corner or the second corner, wherein S is the girth of described flywheel.
Adopt in this way, can at flywheel face scribe line as zero groove, and in the perforate of flywheel center, in this hole, pointer is set, during initial position, adjustment pointer makes it overlap with zero graduation, when detection valve reaches default lift, with meter tape along the arc length between flywheel rim measurement pointer and zero groove line, then calculate according to the corresponding relation of edge arc length and angle, can obtain intake valve, corner that exhaust valve is corresponding when preset strokes simply, exactly, and the cost of production of this detecting method is less.
Certainly, above-mentioned controlling method does not obtain corner in this way only for adopting, and also can carve whole dial on flywheel surface, and like this, pointer directly can read the corner of flywheel, and just the cost of production of such flywheel is slightly high.
In another kind of embodiment, the preset strokes of above-mentioned intake valve, the default lift of exhaust valve can be as 10mm, choose integer value less like this as default lift, are convenient to measure and record.Certainly, above-mentioned default lift also can choose other numerical value, and in addition, the default lift of intake valve and the default lift of exhaust valve also can be set to different numerical value.
In concrete jiggering process, when institute's intake valve stroke distances described in first preset lift≤0.5mm time, can slow down barring speed, until arrive described first preset lift; Or when described exhaust valve stroke distances described in second preset lift≤0.5mm, can slow down barring speed, until arrive described second preset lift.
Like this, convenient operation personnel clearly, accurately read the lift of intake valve, exhaust valve, ensure the accuracy detected further.
Above the controlling method of a kind of diesel engine valve timing provided by the present invention is described in detail.Apply specific case herein to set forth principle of the present invention and mode of execution, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (6)
1. a controlling method for diesel engine valve timing, is characterized in that, comprises the steps:
Be in compression top center for initial position with the piston of motor, according to preset direction jiggering, and detect the lift of intake valve, exhaust valve in real time;
When the lift of described intake valve in closing process equals the first default lift, obtain first corner of flywheel relative to initial position of now motor; When the lift of described exhaust valve in opening process equal second preset lift time, obtain now described flywheel relative to the second corner of initial position;
According to described first corner and described second corner, adjust the valve clearance of described motor and/or the position of cam, to make described first corner, the second corner meets the first standard angle range, the second standard angle range respectively.
2. the controlling method of diesel engine valve timing according to claim 1, is characterized in that, adopts the first dial gauge, the second dial gauge to detect the lift of described intake valve, described exhaust valve respectively in real time.
3. the controlling method of diesel engine valve timing according to claim 2, is characterized in that, according to operative orientation jiggering, when the second dial gauge arrives default lift first, the corner recording described flywheel relative initial position is the second corner; When the first dial gauge second time arrives default lift, the corner recording described flywheel relative initial position is the first corner.
4. the controlling method of the diesel engine valve timing according to any one of claim 1-3, is characterized in that, when obtaining described first corner or the second corner, first obtains the edge arc length L that described flywheel turns over relative to initial position, then basis
Corner=360*L/S
Calculate the first corner or the second corner, wherein S is the girth of described flywheel.
5. the controlling method of the diesel engine valve timing according to any one of claim 1-3, is characterized in that, described first presets lift, the described second default lift is 10mm.
6. the controlling method of diesel engine valve timing according to claim 5, is characterized in that, in jiggering process, when institute's intake valve stroke distances described in first preset lift≤0.5mm time, slow down barring speed, until arrive described first preset lift;
Or when described exhaust valve stroke distances described in second preset lift≤0.5mm, slow down barring speed, until arrive described second preset lift.
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| CN201310482610.5A CN103527280B (en) | 2013-10-15 | 2013-10-15 | A kind of controlling method of diesel engine valve timing |
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| CN201310482610.5A CN103527280B (en) | 2013-10-15 | 2013-10-15 | A kind of controlling method of diesel engine valve timing |
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| CN103527280B true CN103527280B (en) | 2016-01-20 |
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| CN105508071B (en) * | 2014-10-14 | 2019-07-26 | 光阳工业股份有限公司 | Double cylinder engine air inlet arrangement for detecting and method for detecting |
| CN105444654A (en) * | 2015-12-10 | 2016-03-30 | 广西玉柴机器股份有限公司 | Valve-timing phase detection method for engine |
| CN108917535A (en) * | 2018-07-26 | 2018-11-30 | 中国船舶重工集团柴油机有限公司 | Piston stroke measurement tooling and method in marine diesel |
| CN111649642B (en) * | 2020-05-15 | 2021-12-07 | 中国第一汽车股份有限公司 | Timing angle detection method based on double overhead camshaft type engine |
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| JPS5838604B2 (en) * | 1979-01-24 | 1983-08-24 | トヨタ自動車株式会社 | Valve clearance adjustment and valve timing inspection method for internal combustion engines |
| JP4400466B2 (en) * | 2005-01-25 | 2010-01-20 | トヨタ自動車株式会社 | Valve timing adjustment device for start of internal combustion engine |
| CN201057090Y (en) * | 2007-06-29 | 2008-05-07 | 中国船舶重工集团公司第七一一研究所 | Electric barring gear of crankshaft |
| CN201714489U (en) * | 2010-07-15 | 2011-01-19 | 深圳市普禄科智能检测设备有限公司 | Internal combustion engine on-line monitoring and diagnosis device |
| CN201740641U (en) * | 2010-07-29 | 2011-02-09 | 南车戚墅堰机车有限公司 | Crankshaft measuring turning gear for diesel engine |
| CN102528378A (en) * | 2012-03-02 | 2012-07-04 | 潍柴动力股份有限公司 | Assembly method for timing gear of four-stroke six-cylinder diesel engine |
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