CN103527280A - Method for controlling valve timing of diesel engine - Google Patents
Method for controlling valve timing of diesel engine Download PDFInfo
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- CN103527280A CN103527280A CN201310482610.5A CN201310482610A CN103527280A CN 103527280 A CN103527280 A CN 103527280A CN 201310482610 A CN201310482610 A CN 201310482610A CN 103527280 A CN103527280 A CN 103527280A
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Abstract
The invention discloses a method for controlling valve timing of a diesel engine. The method comprises the steps of barring the engine in a preset direction with the position where a piston is on a top dead center of compression as the initial position and detecting the lifting ranges of an inlet valve and an exhaust valve in real time; acquiring a first corner, relative to the initial position, of a flywheel of the engine at the moment when the lifting range, during closing, of the inlet valve is equal to a first preset lifting range; acquiring a second corner, relative to the initial position, of the flywheel at the moment when the lifting range, during opening, of the exhaust valve is equal to a second preset lifting range; adjusting the valve clearance and/or the position of a cam of the engine according to the first corner and the second corner to enable the first corner and the second corner to conform with a first standard corner range and a second standard corner range respectively. According to the method for controlling valve timing of the diesel engine, the corners corresponding the preset lifting ranges of the valves serve as reference values of valve timing to detect whether valve timing meets requirements accurately, adjustment is carried out in a targeted mode, and then technological requirements of the valve timing are finally met.
Description
Technical field
The present invention relates to technical field of engines, relate in particular 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 at piston, to be positioned at the position of top dead center or lower dead center, but to open in advance and hysteresis is closed, reach air inlet as far as possible fully, the clean as far as possible object of exhaust.With crank angle, represent the moment that intake valve, exhaust valve are opened, closed, be called port timing, the diesel engine of each model has the port timing of oneself, and they are generally determined by experiment when design, 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 so that piston in compression top center position, mounting process pointer, technique dial, the angle turning in order to characterize flywheel, and adjust pointer and make it point to " 0 " scale;
The slow jiggering of one people, a people rotates tappet, in rotation process, when just having resistance to occur, stops jiggering, now from dial, reads current angle, this start-up time that is intake valve; When resistance just disappears, from dial, read current angle, this close moment that is exhaust valve, valve timing is verified.
Adopt above-mentioned controlling method, can obtain comparatively simply valve timing, yet, 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 larger large-scale diesel engine of valve timing, 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 detect and need the technique part made more according to traditional approach by force, high cost.
In view of this, urgently for above-mentioned technical problem, the controlling method of a kind of new valve timing that is suitable for large-scale four-cycle diesel of design that looks for another way, 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, comprise the steps:
The piston of described motor of take is initial position in compression top center, according to preset direction jiggering, and detects in real time the lift of intake valve, exhaust valve;
When the lift of described intake valve in closing process equals the first default lift, obtain the flywheel of motor now with respect to the first corner of initial position; When the lift of described exhaust valve in opening process equals the second default lift, obtain now described flywheel with respect to the second corner of initial position;
According to described the first corner and described the second corner, adjust the valve clearance of described motor and/or the position of cam, so that described the first corner, the second corner meet respectively the first standard angle range, the second standard angle range.
Adopt above-mentioned controlling method, in the time of can presetting intake valve arrive the first default lift when the design process of diesel engine in closing process, flywheel the first standard angle range that the initial position in compression top center starts to turn over from piston, and exhaust valve is while arriving the second default lift in opening procedure, the second standard angle range that flywheel starts to turn over from initial position.
Therefore for example, for large-scale diesel engine (marine diesel engine), because its valve timing angle is too large, measure and from bent axle, start 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 the first standard angle range and the second standard angle range can be used as the reference value of the sign valve timing of large-scale diesel engine.When valve is when corresponding corner is at above-mentioned standard angle range during in default lift, represent that valve timing meets technological requirement, otherwise represent that valve timing is undesirable, need to readjust.
In concrete control procedure, first choose piston initial position as detection when top dead center, this is that the moment due to IO Intake Valve Opens and exhaust valve closing is exactly almost the moment of piston 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, exhaust valve corresponding corner when default lift, then the reference value using this corner as valve timing, adjust on this basis the position of valve clearance or cam, so that valve timing meets reference value.
As can be seen here, above-mentioned controlling method using valve when the default lift corresponding corner as the reference value of valve timing, detect accurately, easily valve timing and whether meet technological requirement, thereby 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, so that final precise control.
Preferably, adopt the first dial gauge, the second dial gauge to detect in real time respectively the lift of described intake valve, described exhaust valve.
Preferably, according to operative orientation jiggering, when the second dial gauge arrives default lift first, the corner that records the relative initial position of described flywheel is the second corner; When the first dial gauge arrives default lift for the second time, the corner that records the relative initial position of described flywheel is the first corner.
Preferably, while obtaining described the first corner or the second corner, first obtain the edge arc length L that described flywheel turns over respect to initial position, then basis
Corner=360*L/S
Calculate the first corner or the second corner, the girth that wherein S is described flywheel.
Preferably, the described first default lift, the described second default lift are 10mm.
Preferably, in jiggering process, when described in the stroke distances of institute's intake valve during first default lift≤0.5mm, the barring speed that slows down, until arrive the described first default lift;
Or as second default lift≤0.5mm described in the stroke distances of described exhaust valve, the barring speed that slows down, until arrive the described second default lift.
Accompanying drawing explanation
Fig. 1 is a kind of FB(flow block) 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 be measured the valve timing of large-scale four-cycle diesel accurately, further strengthens the precision of controlling, and has less cost.
In order to make those skilled in the art understand better technological scheme of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1, the FB(flow block) of a kind of embodiment of the controlling method that Fig. 1 is 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: the piston of described motor of take is initial position in compression top center, 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 the first default lift, if so, carries out step S13, if not, execution step S14;
S13: obtain the flywheel of motor now with respect to the first corner of initial position;
S14: keep current state constant;
S15: judge whether the lift of described exhaust valve in opening process equals the second default lift, if so, performs step S16, if not, execution step S14;
S16: obtain now flywheel with respect to the second corner of initial position;
S17: according to described the first corner and described the second corner, adjust the valve clearance of described motor and/or the position of cam, so that described the first corner, the second corner meet respectively the first standard angle range, the second standard angle range.
Adopt above-mentioned controlling method, in the time of can presetting intake valve arrive the first default lift when the design process of diesel engine in closing process, flywheel the first standard angle range that the initial position in compression top center starts to turn over from piston, and exhaust valve is while arriving the second default lift in opening procedure, the second standard angle range that flywheel starts to turn over from initial position.
Therefore for example, for large-scale diesel engine (marine diesel engine), because its valve timing angle is too large, measure and from bent axle, start 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 the first standard angle range and the second standard angle range can be used as the reference value of the sign valve timing of large-scale diesel engine.When valve is when corresponding corner is at above-mentioned standard angle range during in default lift, represent that valve timing meets technological requirement, otherwise represent that valve timing is undesirable, need to readjust.
In concrete control procedure, step S11 chooses piston initial position as detection when top dead center, this is that the moment due to IO Intake Valve Opens and exhaust valve closing is exactly almost the moment of piston 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 has obtained intake valve, exhaust valve corresponding corner 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 so that valve timing meets reference value.
As can be seen here, above-mentioned controlling method using valve when the default lift corresponding corner as the reference value of valve timing, detect accurately, easily valve timing and whether meet technological requirement, thereby 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, so that final precise control.
The concrete grammar of the lift of above-mentioned detection intake valve, exhaust valve can also be further set.
In another kind of embodiment, can the first dial gauge, the second dial gauge be installed respectively at the top correct position of the rotating machinery of intake valve, exhaust valve, be respectively used to detect the displacement amount of intake valve, exhaust valve.
During use, first by the pointer zeroing 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 detection part that the precision such as dial indicator are higher to measure the lift of valve.
In another kind of embodiment, above-mentioned controlling method can be according to operative orientation (forward) jiggering in testing process, and when the second dial gauge arrives default lift first, the corner that records the relative initial position of described flywheel is the second corner; When the first dial gauge arrives default lift for the second time, record corner position first corner of the relative initial position of described flywheel.
Like this, in forward jiggering process, compression top center position during due to initial position, therefore exhaust valve first when exhaust stroke, detected and in opening procedure, reach the second default lift, intake valve when aspirating stroke, detected again and in closing process, reach the first default lift, whole procedural order is reasonable, convenient operation.
Certainly, above-mentioned controlling method, not only for the mode that adopts forward jiggering, detects in real time, can also adopt reverse jiggering, the real-time mode detecting, the order just detecting and the stroke reversed in order of diesel engine.
In another kind of embodiment, first above-mentioned controlling method, when obtaining the first corner and the second corner, can obtain the edge arc length L that described flywheel turns over respect to initial position, then basis
Corner=360*L/S
Calculate the first corner or the second corner, the girth that wherein S is described flywheel.
Adopt in this way, can be at flywheel surface groove as zero groove, and in the perforate of flywheel center, in this hole, pointer is set, during initial position, adjusting pointer makes it overlap with zero graduation, detecting valve reaches while presetting lift, with meter tape along the arc length between flywheel edge metering pointer and zero groove line, then according to the corresponding relation of edge arc length and angle, calculate, can obtain simply, exactly intake valve, exhaust valve corresponding corner when default stroke, and the cost of production of this detecting method is less.
Certainly, above-mentioned controlling method is not obtained corner in this way only for adopting, and can on flywheel surface, carve whole dial yet, and like this, pointer can directly be read the corner of flywheel, and the cost of production that is such flywheel is slightly high.
In another kind of embodiment, the default stroke of above-mentioned intake valve, the default lift of exhaust valve can be as 10mm, choose less like this integer value as default lift, are convenient to measure and record.Certainly, above-mentioned default lift also can be chosen 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 described in the stroke distances of institute's intake valve during first default lift≤0.5mm, the barring speed that can slow down, until arrive the described first default lift; Or as second default lift≤0.5mm described in the stroke distances of described exhaust valve, the barring speed that can slow down, until arrive the described second default lift.
Like this, the lift that convenient operation personnel are clearer, accurately read intake valve, exhaust valve, further guarantees the accuracy detecting.
Above the controlling method of a kind of diesel engine valve timing provided by the present invention is described in detail.Applied specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation is just for helping to understand method of the present invention and core concept thereof.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 improvement and modification 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:
The piston of described motor of take is initial position in compression top center, according to preset direction jiggering, and detects in real time the lift of intake valve, exhaust valve;
When the lift of described intake valve in closing process equals the first default lift, obtain the flywheel of motor now with respect to the first corner of initial position; When the lift of described exhaust valve in opening process equals the second default lift, obtain now described flywheel with respect to the second corner of initial position;
According to described the first corner and described the second corner, adjust the valve clearance of described motor and/or the position of cam, so that described the first corner, the second corner meet respectively the first standard angle range, the second standard angle range.
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 in real time respectively the lift of described intake valve, described exhaust valve.
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 that records the relative initial position of described flywheel is the second corner; When the first dial gauge arrives default lift for the second time, the corner that records the relative initial position of described flywheel is the first corner.
4. according to the controlling method of the diesel engine valve timing described in claim 1-3 any one, it is characterized in that, while obtaining described the first corner or the second corner, first obtain the edge arc length L that described flywheel turns over respect to initial position, then basis
Corner=360*L/S
Calculate the first corner or the second corner, the girth that wherein S is described flywheel.
5. according to the controlling method of the diesel engine valve timing described in claim 1-3 any one, it is characterized in that, the described first default lift, the described second default lift are 10mm.
6. the controlling method of diesel engine valve timing according to claim 5, is characterized in that, in jiggering process, when described in the stroke distances of institute's intake valve during first default lift≤0.5mm, the barring speed that slows down, until arrive the described first default lift;
Or as second default lift≤0.5mm described in the stroke distances of described exhaust valve, the barring speed that slows down, until arrive the described second default 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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Cited By (4)
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| 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 |
| CN105508071A (en) * | 2014-10-14 | 2016-04-20 | 光阳工业股份有限公司 | Double-cylinder engine air suction detecting device and method |
| 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 |
| CN111649642A (en) * | 2020-05-15 | 2020-09-11 | 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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN111649642A (en) * | 2020-05-15 | 2020-09-11 | 中国第一汽车股份有限公司 | Timing angle detection method based on double overhead camshaft type engine |
| 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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