CN102564700A - Detection method and control system for detecting tightness of engine air cylinder as well as engine system - Google Patents
Detection method and control system for detecting tightness of engine air cylinder as well as engine system Download PDFInfo
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- CN102564700A CN102564700A CN2011104557114A CN201110455711A CN102564700A CN 102564700 A CN102564700 A CN 102564700A CN 2011104557114 A CN2011104557114 A CN 2011104557114A CN 201110455711 A CN201110455711 A CN 201110455711A CN 102564700 A CN102564700 A CN 102564700A
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Abstract
The invention discloses a detection method and a control system for detecting the tightness of an engine air cylinder as well as an engine system. The method comprises the following steps of: firstly, obtaining an engine real-time rotating speed signal and a crank real-time rotating angle signal; secondly, selecting a first crank rotation angle a1 and a second crank rotation angle a2 and selecting engine rotating speeds b1 and b2 corresponding to two different crank rotating angles within the same period of crank rotation according to the real-time signals, and calculating an absolute value of b1-b2 so as to further judge whether the absolute value of a difference value between the absolute value of b1-b2 and a rotating speed standard value b of an internal engine is more than a pre-set standard value C or not; and finally, sending a corresponding display instruction according to a judging result. With the adoption of the detecting method, the detection of the tightness of the air cylinder can be realized under an engine operation state. Therefore, an operator is good for knowing about an operation condition of the air cylinder in real time; the engine can be prevented from being operated under a working condition of low tightness; and the use efficiency of the engine can be improved and the service life of the other parts can be prolonged.
Description
Technical field
The present invention relates to the automatic control technology field of engineering machinery, particularly a kind of detection method of cylinder sealing, control system and engine system.
Background technology
Engine system is a power part important in the engineering truck, the normal operation of engineering truck with exercise in play crucial effects.
The Traditional engine system generally comprises two great institutions and five big systems in the prior art, i.e. toggle, valve actuating mechanism and fuel system, lubricating system, cooling system, firing system and starting system, and electric-control motor also comprises control system.Toggle comprises cylinder, places parts such as the piston of cylinder interior, connecting bar and crankshaft and flywheel; Toggle mainly is to realize engine operational cycle; Accomplish the critical piece of Conversion of energy, in the work done process, piston bears gaseous-pressure moving linearly in cylinder; Convert rotatablely moving of bent axle into through connecting rod, and from the external outputting power of bent axle; When in air inlet, compression and instroke, flywheel releases energy and is converted into rotatablely moving of bent axle the rectilinear motion of piston.
Wherein, the sealing of cylinder is one of important parameter of engine, if the sealing of the some cylinders of engine is poor; Cause gas leakage; Make that the roughness of engine is fixed, noise big, power loss and piston air leak amount increase adverse consequencess such as causing the lubricating oil accelerated deterioration, cylinder interior pressure seriously reduces, and also possibly cause the engine start difficulty; Can not starting engine, influence the normal operation of engineering machinery.
Yet engine is directly measured relatively difficulty to the air leakage of cylinder under operating condition, the method that sealing of cylinder is not detected at present.
Therefore, how a kind of detection method of cylinder sealing being provided, when engine moves, can effectively detecting the sealing property of cylinder, is those skilled in that art's problem demanding prompt solutions.
Summary of the invention
The object of the invention purport is the detection method that a kind of cylinder sealing is provided, and when engine moves, can effectively detect the sealing property of cylinder.On this basis, the present invention also provides a kind of cylinder sealing control system and engine system.
For solving first technical matters, the invention provides a kind of detection method of cylinder sealing, this method is carried out according to following step:
Step S101: obtain engine speed live signal and crank angle live signal;
Step S102: according to said engine speed live signal, said crank angle live signal; In bent axle rotates with one-period; Choose the first crank angle a1 and the second crank angle a2, and corresponding engine speed b1 and the b2 of two different crank angles, and calculate | b1-b2|;
Step S103: judge above-mentioned | b1-b2| and built-in engine speed standard value b between the two the absolute value of difference whether greater than preset standard value C, if || b1-b2|-b| is greater than C, and then execution in step 105; Otherwise,, execution in step 104;
Step S104: send the good idsplay order of engine cylinder sealing;
Step S105: send the relatively poor idsplay order of cylinder sealing.
Preferably, first crank angle step 102) and said second crank angle mutually difference less than 180 degree.
Preferably, said first crank angle and said second crank angle differ 20 degree.
Preferably, also comprise step 106, particular content is following:
106), receiving step 104) or/and step 105) in idsplay order, and carry out each idsplay order.
The detection method of cylinder sealing provided by the invention; At first obtain engine speed live signal and crank angle live signal; In bent axle rotates with one-period, choose first crank angle and second crank angle then, calculate the absolute value of the corresponding engine speed difference of two crank angles; And judge this absolute value and the built-in engine speed standard value order of magnitude of difference between the two; If the absolute value of both differences is greater than the preset standard value, then the engine cylinder sealing is good, otherwise the cylinder sealing is relatively poor; And send corresponding idsplay order according to judged result, the situation of the sealing of each cylinder when operating personnel can understand the engine operation according to idsplay order.
The detection method of cylinder sealing provided by the invention can realize the detection of engine operating state lower cylinder sealing; Help the operation conditions that operating personnel understand cylinder in real time; Avoid engine under the relatively poor operating mode of cylinder impermeability, to move, help operating personnel in time to fix a breakdown, make engine be in the steady state (SS) operation all the time; Not only can improve the service efficiency of engine, but also the serviceable life that can improve each parts of engine.
On the basis of above-mentioned detection method, the present invention also provides a kind of detection system of cylinder sealing, comprise obtain telltale, controller obtains telltale and is used to obtain engine speed live signal and crank angle live signal;
Said controller is according to said engine speed live signal and said crank angle live signal; In bent axle rotates with one-period; Choose the absolute value of the corresponding engine speed difference of two different crank angles; Judge the absolute value of above-mentioned absolute value and built-in engine speed standard value difference and the size of preset standard value, and send corresponding idsplay order according to judged result.
Preferably, the said telltale that obtains comprises the rotary angle transmitter that is arranged at respectively on said engine and the said bent axle, seizes respectively and gets engine speed live signal and crank angle live signal.
Preferably, also comprise the display device that is used to receive the idsplay order of said controller and carries out each idsplay order.
Preferably, said display device is the display platform in the control cabin.
Except that above-mentioned detection method and control system, the present invention also provides a kind of engine system, comprises cylinder and cylinder sealing detection system, and said control system is above-mentioned each described cylinder sealing control system.
Because of the detection method of cylinder sealing has above-mentioned technique effect, also should have above-mentioned technique effect so use the cylinder sealing control system and the engine system of above-mentioned detection method.
Description of drawings
Fig. 1 is the process flow diagram of the detection method of cylinder sealing provided by the present invention;
Fig. 2 is a kind of composition frame chart of embodiment of the detection system of cylinder sealing provided by the present invention;
Fig. 3 is the curve synoptic diagram of cylinder sealing good and actual condition crank angle and engine speed;
Fig. 4 is the process flow diagram of the another kind of detection method of cylinder sealing provided by the present invention; Fig. 5 is the composition frame chart of another kind of embodiment of the detection system of cylinder sealing provided by the present invention.
Embodiment
Core purport of the present invention is the detection method that a kind of cylinder sealing is provided, and when engine moves, can effectively detect the sealing property of cylinder.On this basis, the present invention also provides a kind of cylinder sealing control system and engine system.
In order to make those skilled in the art understand technical scheme of the present invention better, below in conjunction with the detection method and the control system of cylinder sealing, and accompanying drawing and specific embodiment are done further detailed description to the present invention.
Please refer to Fig. 1 and Fig. 2, Fig. 1 is the process flow diagram of the detection method of cylinder sealing provided by the present invention; Fig. 2 is a kind of composition frame chart of embodiment of the detection system of cylinder sealing provided by the present invention.
The invention provides a kind of detection system of cylinder sealing, the impermeability that is used for cylinder detects, and comprises and obtains telltale, controller; Obtain telltale and be used to obtain engine speed live signal and crank angle live signal; Obtaining of above-mentioned two signals can be passed through different rotary angle transmitters respectively; Rotary angle transmitter can be touch sensor, also can be non-contacting sensor, for example: electro-optical pickoff etc.
Controller in this detection system is according to said engine speed live signal and said crank angle live signal; At first in bent axle rotates with one-period; Choose the absolute value of the corresponding engine speed difference of two different crank angles; Two selected for convenience crank angles are defined as the first crank angle a1 and the second crank angle a2, and both corresponding respectively engine speed are b1 and b2, secondly calculate | the size of b1-b2|; And then judging above-mentioned | whether b1-b2| and built-in engine speed standard value the b absolute value of difference between the two and according to judged result send corresponding idsplay order greater than preset standard value C.
Rotational speed criteria value and the preset standard value C that needs explanation is according to the condition enactments such as concrete operating mode of engine.
Usually, through the difference of engine strokes, can obtain engine and accomplish air inlet, compression, work done, exhaust four stroke; The angle that bent axle rotates; To accomplish above-mentioned four one-periods that process is an engine among this paper, two-stroke engine for example, bent axle rotate 360 degree and accomplish above-mentioned four processes; And Otto cycle engine, bent axle need rotate 720 degree and accomplish above-mentioned four processes.
Please refer to Fig. 3, Fig. 3 is the curve synoptic diagram of cylinder sealing good and actual condition crank angle and engine speed, and horizontal ordinate is a crank angle; Ordinate is an engine speed; Curve 1 is a cylinder actual condition detection curve, and curve 2 is a cylinder impermeability works fine curve, and oo ' is in to putting the position for the engine piston of operate as normal curve; Be defined as engine work done maximum position place to putting on the what is called; Only provided the rotational angle and the rotating speed of engine of the bent axle of accomplishing the action of engine one-period among the figure, oo ' as shown in Figure 3 is between the peak region of left side be cylinder work done interval, and oo ' is to being between the cylinder compression zone between the peak region of right side accordingly; Other periodic groups seemingly, so save.
Particularly, the flow process of the detection method of the cylinder sealing control system that is provided among the present invention can be with reference to as shown in Figure 1, and this method can be carried out according to following step:
Step S101: obtain engine speed live signal and crank angle live signal;
Step S102: according to said engine speed live signal, said crank angle live signal; In bent axle rotates with one-period; Choose the first crank angle a1 and the second crank angle a2, and corresponding engine speed b1 and the b2 of two different crank angles, and calculate | b1-b2|;
Step S103: judge above-mentioned | b1-b2| and built-in engine speed standard value b between the two the absolute value of difference whether greater than preset standard value C, if || b1-b2|-b| is greater than C, then execution in step S105); Otherwise,, execution in step S104);
Step S104: send the good idsplay order of engine cylinder sealing;
Step S105: send the relatively poor idsplay order of cylinder sealing.
The detection method of cylinder sealing provided by the invention; At first obtain engine speed live signal and crank angle live signal; In bent axle rotates with one-period, choose the first crank angle a1 and the second crank angle a2 then, calculate the absolute value of the corresponding engine speed difference of two crank angles; And judge this absolute value and the built-in engine speed standard value order of magnitude of difference between the two; If the absolute value of both differences is greater than the preset standard value, then the engine cylinder sealing is good, otherwise the cylinder sealing is relatively poor; And send corresponding idsplay order according to judged result, the situation of the sealing of each cylinder when operating personnel can understand engine operation through this idsplay order.
The detection method of cylinder sealing provided by the invention can realize the detection of engine operating state lower cylinder sealing; Help the operation conditions that operating personnel understand cylinder in real time; Avoid engine under the relatively poor operating mode of cylinder impermeability, to move, help operating personnel in time to fix a breakdown, make engine be in the steady state (SS) operation all the time; Not only can improve the service efficiency of engine, but also the serviceable life that can improve each parts of engine.
A kind of preferred embodiment in; Numerical value when the first crank angle a1 and the said second crank angle a2 are in same work done of engine or compressive state in the above-mentioned detection method; This is chosen mode and judges that separately cylinder is in the impermeability of compression or work done two condition lower cylinder separately, increases the accuracy of judging.
In order to increase the accuracy that impermeability is judged; Can pass through practical experience or computer simulation means; The angle of rationally choosing between the first crank angle a1 and the second crank angle a2 is a proper angle, has provided a kind of set-up mode of engine embodiment in this article, and is specific as follows.
In a kind of embodiment, difference can be smaller or equal to 20 degree mutually with the said second crank angle a2, two angles for the first crank angle a1, and detected value is more accurate in this differential seat angle scope.
Certainly, just provided preferred embodiment a kind ofly among this paper, it will be understood by those skilled in the art that the concrete operating mode according to engine, the first crank angle a1 and the said second crank angle a2, two angles difference mutually also can be other numerical value.
And, can also take multiple measurements comparison in the crank angle interval of same work done or compressive state through repeatedly measuring engine, so that further accurately judge, reduce error in judgement.
Please refer to Fig. 4 and Fig. 5, Fig. 4 is the process flow diagram of the another kind of detection method of cylinder sealing provided by the present invention; Fig. 5 is the composition frame chart of another kind of embodiment of the detection system of cylinder sealing provided by the present invention.
In a kind of preferred implementation; The idsplay order that display device is used to receive and implementation controller sends; This idsplay order can be the vision signal idsplay order; That is to say that this display device can be video display devices, the work state information of each cylinder that this video display devices can be next with the controller transmission is shown on the screen, and corresponding controlled step is specific as follows:
Step S201: obtain engine speed live signal and crank angle live signal;
Step S202: according to said engine speed live signal, said crank angle live signal; In bent axle rotates with one-period; Choose the first crank angle a1 and the second crank angle a2, and corresponding engine speed b1 and the b2 of two different crank angles, and calculate | b1-b2|;
Step S203: judge above-mentioned | b1-b2| and built-in engine speed standard value b between the two the absolute value of difference whether greater than preset standard value C, if || b1-b2|-b| is greater than C, then execution in step S205); Otherwise,, execution in step S204);
Step S204: send the good idsplay order of engine cylinder sealing;
Step S205: send the relatively poor idsplay order of cylinder sealing;
Step S206: receiving step S204) or/and step S205) idsplay order in, and carry out each idsplay order.
Certainly, display device also can receive only the idsplay order of the problematic cylinder of impermeability in the above-mentioned control method, reminds the user.
Among above-mentioned each embodiment, display device can be the display platform in the control cabin, is convenient to operating personnel and observes, and in time take corresponding actions, can further reduce engine in the following working time of leakage situation.
In another kind of preferred implementation; Obtain telltale among above-mentioned each embodiment and can comprise the rotary angle transmitter that is arranged at respectively on said engine and the bent axle; Seize respectively and get engine speed live signal and crank angle live signal, on the concrete flywheel that can be arranged at engine and on the camshaft of crank.
Detection method and control system based on above-mentioned cylinder sealing; The present invention also provides a kind of engine; Comprise car body and prevent the control system that said car body is tumbled that said control system is the cylinder sealing control system described in above-mentioned arbitrary embodiment.
Because control system has above-mentioned technique effect, also has above-mentioned technique effect so have the engine of this control system.
Other structures of engine please refer to the prior art data, do not do at this and give unnecessary details.
More than detection method, detection system and the engine of cylinder sealing provided by the present invention carried out detailed introduction.Used concrete example among this paper principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle 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 claim of the present invention.
Claims (9)
1. the detection method of a cylinder sealing is characterized in that, this method is carried out according to following step:
101), obtain engine speed live signal and crank angle live signal;
102), according to said engine speed live signal, said crank angle live signal; In bent axle rotates with one-period; Choose the first crank angle a1 and the second crank angle a2, and corresponding engine speed b1 and the b2 of two different crank angles, and calculate | b1-b2|;
103), judge above-mentioned | b1-b2| and built-in engine speed standard value b between the two the absolute value of difference whether greater than preset standard value C, if || b1-b2|-b| is greater than C, and then execution in step 105; Otherwise,, execution in step 104.
104), send the good idsplay order of engine cylinder sealing;
105), send the relatively poor idsplay order of cylinder sealing.
2. detection method as claimed in claim 1 is characterized in that step 102) described in the first crank angle a1 and the said second crank angle a2 numerical value when being in same work done of engine or compressive state.
3. according to claim 1 or claim 2 detection method is characterized in that, first crank angle and the said second crank angle a2 of a1 mutually difference smaller or equal to 20 degree.
4. detection method as claimed in claim 1 is characterized in that, also comprises step 106, and particular content is following:
106), receiving step 104 is or/and the idsplay order in the step 105, and carries out each idsplay order.
5. the detection system of a cylinder sealing is characterized in that, comprises obtaining telltale, controller;
The said telltale that obtains is used to obtain engine speed live signal and crank angle live signal;
Said controller is according to said engine speed live signal and said crank angle live signal; In bent axle rotates with one-period; Choose the absolute value of the corresponding engine speed difference of two different crank angles; Judge the absolute value of above-mentioned absolute value and built-in engine speed standard value difference and the size of preset standard value, and send corresponding idsplay order according to judged result.
6. the detection system of cylinder sealing as claimed in claim 5; It is characterized in that; The said telltale that obtains comprises the rotary angle transmitter that is arranged at respectively on said engine and the said bent axle, seizes respectively and gets engine speed live signal and crank angle live signal.
7. like the detection system of claim 5 or 6 described cylinder sealings, it is characterized in that, also comprise the display device that is used to receive the idsplay order of said controller and carries out each idsplay order.
8. the detection system of cylinder sealing as claimed in claim 7 is characterized in that, said display device is the display platform in the control cabin.
9. an engine system comprises cylinder and cylinder sealing detection system, it is characterized in that said detection system is the detection system of each described cylinder sealing of claim 5 to 8.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103542983A (en) * | 2013-10-17 | 2014-01-29 | 联合汽车电子有限公司 | Gas leakage detection method for engine cylinder |
| CN104865010A (en) * | 2015-05-07 | 2015-08-26 | 中国重汽集团济南动力有限公司 | Engine air cylinder sealing performance test method and system |
| CN107576459A (en) * | 2017-08-10 | 2018-01-12 | 中国北方发动机研究所(天津) | A kind of Engine Cylinder Sealing detection means |
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| US6055852A (en) * | 1998-11-06 | 2000-05-02 | Cummins Engine Company, Inc. | Method and apparatus for estimation of relative cylinder compression balance by cranking speed analysis |
| US20010047681A1 (en) * | 2000-05-25 | 2001-12-06 | Dietrich Burkardt | Process for cylinder-selective leakage testing of the combustion chambers in a combustion engine |
| CN101375025A (en) * | 2005-12-21 | 2009-02-25 | 霍尼韦尔国际公司 | Onboard diagnostics for anomalous cylinder behavior |
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| CN1152122A (en) * | 1995-07-20 | 1997-06-18 | 丰田自动车株式会社 | Method of testing pressure relief |
| US6055852A (en) * | 1998-11-06 | 2000-05-02 | Cummins Engine Company, Inc. | Method and apparatus for estimation of relative cylinder compression balance by cranking speed analysis |
| US20010047681A1 (en) * | 2000-05-25 | 2001-12-06 | Dietrich Burkardt | Process for cylinder-selective leakage testing of the combustion chambers in a combustion engine |
| CN101375025A (en) * | 2005-12-21 | 2009-02-25 | 霍尼韦尔国际公司 | Onboard diagnostics for anomalous cylinder behavior |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103542983A (en) * | 2013-10-17 | 2014-01-29 | 联合汽车电子有限公司 | Gas leakage detection method for engine cylinder |
| CN104865010A (en) * | 2015-05-07 | 2015-08-26 | 中国重汽集团济南动力有限公司 | Engine air cylinder sealing performance test method and system |
| CN107576459A (en) * | 2017-08-10 | 2018-01-12 | 中国北方发动机研究所(天津) | A kind of Engine Cylinder Sealing detection means |
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Inventor after: Wang Zhijian Inventor after: Wang Yihua Inventor after: Li Shizhen Inventor after: Ma Linlin Inventor before: Wang Yihua Inventor before: Li Shizhen Inventor before: Ma Linlin |
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