CN103389209A - Method and system for analyzing time domain of top dead center positions on engine pistons - Google Patents
Method and system for analyzing time domain of top dead center positions on engine pistons Download PDFInfo
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- CN103389209A CN103389209A CN2013103330668A CN201310333066A CN103389209A CN 103389209 A CN103389209 A CN 103389209A CN 2013103330668 A CN2013103330668 A CN 2013103330668A CN 201310333066 A CN201310333066 A CN 201310333066A CN 103389209 A CN103389209 A CN 103389209A
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Abstract
The invention provides a method and a system for analyzing a time domain of top dead center positions on engine pistons. The method comprises the steps as follows: a dead center position upper bound and a dead center position lower bound of a first cylinder are selected in a crank angle range from 14.5 degrees to 20.2 degrees, a dead center position upper bound and a dead center position lower bound of a third cylinder are selected in a crank angle range from 194.5 degrees to 200.2 degrees, a dead center position upper bound and a dead center position lower bound of a fourth cylinder are selected in a crank angle range from 374.5 degrees to 380.2 degrees, and a dead center position upper bound and a dead center position lower bound of a second cylinder are selected in a crank angle range from 554.5 degrees to 560.2 degrees; and when a piston of each cylinder reaches the upper dead center, whether a crank angle of a connecting rod bearing shell connected with the piston of the cylinder is in the range between the dead center position upper bound and the dead center position lower bound when input and output torque of the connecting rod bearing shell is in the zero position is monitored, if not, then whether the crank angle of the connecting rod bearing shell connected with the piston of the cylinder is lagged by 0.1-5 degrees of the crank angle compared with the dead center position upper bound of the cylinder when input and output torque of the connecting rod bearing shell is in the zero position is further monitored, and if yes, the condition that the connecting rod bearing shell of the cylinder is abraded is determined. With the adoption of the method and the system for analyzing the time domain of the top dead center positions of the engine pistons, one engine cylinder with risks of connecting rod bearing shell galling or burning can be accurately judged, so that galling or burning is prevented from being caused after the finished engine is mounted on a vehicle.
Description
Technical field
The present invention relates to a kind of engine piston top dead center position Time Domain Analysis and system.
Background technology
Towards lightweight, powerful future development, the specific loading that the crank-shaft link neck of engine bears is increasing along with engine.Usually there are foreign matter, lubricated bad or dimensional fits to have deviation all can cause the phenomenon of engine crankshaft connecting rod bearing shell plucking or tile kilning to occur in the friction pair of engine.Therefore, need at present a kind of engine of can monitoring out badly and whether have the method and system of connecting rod bearing shell plucking or tile kilning risk.
Summary of the invention
The object of the present invention is to provide a kind of engine piston top dead center position Time Domain Analysis and system, can accurately judge the engine that exists connecting rod bearing shell plucking or tile kilning risk, avoid engine that plucking or tile kilning occur after the car load entrucking again.
For addressing the above problem, the invention provides a kind of engine piston top dead center position Time Domain Analysis, comprising:
select the null position upper bound and the null position lower bound of the first cylinder of engine in the scope of 14.5 ° of crank angle to 20.2 ° crank angles, select the null position upper bound and the null position lower bound of the 3rd cylinder of engine in the scope of 194.5 ° of crank angle to 200.2 ° crank angles, select the null position upper bound and the null position lower bound of the 4th cylinder of engine in the scope of 374.5 ° of crank angle to 380.2 ° crank angles, select the null position upper bound and the null position lower bound of the second cylinder of engine in the scope of 554.5 ° of crank angle to 560.2 ° crank angles, wherein, the null position upper bound of each cylinder is greater than the null position lower bound of this cylinder,
Engine is carried out cold examination test, when the piston arrives top dead centre of each cylinder of engine, the input and output moment of torsion of the connecting rod bearing shell that monitoring is connected with the piston of this cylinder is whether the crank angle of zero position is in the null position upper bound and the scope between the null position lower bound of this cylinder;
If there are not wearing and tearing in the connecting rod bearing shell that is judged as this cylinder;
If not, the input and output moment of torsion of further monitoring the connecting rod bearing shell of this cylinder is whether the crank angle of zero position is than the null position upper bound of this cylinder 0.1～5 ° of crank angle that lags behind, if there are wearing and tearing in the connecting rod bearing shell that is judged as this cylinder.
Further, in said method, the null position upper bound of the first cylinder of described engine and null position lower bound are respectively 14.5 ° and 20.2 ° of crank angles.
Further, in said method, the null position upper bound of the 3rd cylinder of described engine and null position lower bound are respectively 194.5 ° and 200.2 ° of crank angles.
Further, in said method, the null position upper bound of the 4th cylinder of described engine and null position lower bound are respectively 374.5 ° and 380.2 ° of crank angles.
Further, in said method, the null position upper bound of the 4th cylinder of described engine and null position lower bound are respectively 554.5 ° and 560.2 ° of crank angles.
According to another side of the present invention, a kind of engine piston top dead center position Time Domain Analysis and system are provided, comprising:
the bound module, be used for selecting the null position upper bound and the null position lower bound of the first cylinder of engine in the scope of 14.5 ° of crank angle to 20.2 ° crank angles, select the null position upper bound and the null position lower bound of the 3rd cylinder of engine in the scope of 194.5 ° of crank angle to 200.2 ° crank angles, select the null position upper bound and the null position lower bound of the 4th cylinder of engine in the scope of 374.5 ° of crank angle to 380.2 ° crank angles, select the null position upper bound and the null position lower bound of the second cylinder of engine in the scope of 554.5 ° of crank angle to 560.2 ° crank angles, wherein, the null position upper bound of each cylinder is greater than the null position lower bound of this cylinder,
Monitoring module, be used for engine is carried out cold examination test, when the piston arrives top dead centre of each cylinder of engine, the input and output moment of torsion of the connecting rod bearing shell that monitoring is connected with the piston of this cylinder is whether the crank angle of zero position is in the null position upper bound and the scope between the null position lower bound of this cylinder;
The first judge module, the crank angle that is used for input and output moment of torsion when the connecting rod bearing shell of a certain cylinder and is zero position are in the null position upper bound of this cylinder and the scope between the null position lower bound time, and there are not wearing and tearing in the connecting rod bearing shell that is judged as this cylinder;
The second judge module, the crank angle that is used for input and output moment of torsion when a certain cylinder rod bearing shell and is zero position is not in the scope between this cylinder null position upper bound and null position lower bound the time, the input and output moment of torsion of further monitoring the connecting rod bearing shell of this cylinder is whether the crank angle of zero position is than the null position upper bound of this cylinder 0.1～5 ° of crank angle that lags behind, if there are wearing and tearing in the connecting rod bearing shell that is judged as this cylinder.
Further, in said system, the null position upper bound and the null position lower bound of the first cylinder of the engine that described bound module is selected are respectively 14.5 ° and 20.2 ° of crank angles.
Further, in said system, the null position upper bound and the null position lower bound of the 3rd cylinder of the engine that described bound module is selected are respectively 194.5 ° and 200.2 ° of crank angles.
Further, in said system, the null position upper bound and the null position lower bound of the 4th cylinder of the engine that described bound module is selected are respectively 374.5 ° and 380.2 ° of crank angles.
Further, in said system, the null position upper bound and the null position lower bound of the 4th cylinder of the engine that described bound module is selected are respectively 554.5 ° and 560.2 ° of crank angles.
compared with prior art, the present invention is by selecting the null position upper bound and the null position lower bound of the first cylinder of engine in the scope of 14.5 ° of crank angle to 20.2 ° crank angles, select the null position upper bound and the null position lower bound of the 3rd cylinder of engine in the scope of 194.5 ° of crank angle to 200.2 ° crank angles, select the null position upper bound and the null position lower bound of the 4th cylinder of engine in the scope of 374.5 ° of crank angle to 380.2 ° crank angles, select the null position upper bound and the null position lower bound of the second cylinder of engine in the scope of 554.5 ° of crank angle to 560.2 ° crank angles, wherein, the null position upper bound of each cylinder is greater than the null position lower bound of this cylinder, engine is carried out cold examination test, when the piston arrives top dead centre of each cylinder of engine, the input and output moment of torsion of the connecting rod bearing shell that monitoring is connected with the piston of this cylinder is whether the crank angle of zero position is in the null position upper bound and the scope between the null position lower bound of this cylinder, if there are not wearing and tearing in the connecting rod bearing shell that is judged as this cylinder, if not, the input and output moment of torsion of further monitoring the connecting rod bearing shell of this cylinder is whether the crank angle of zero position is than the null position upper bound of this cylinder 0.1～5 ° of crank angle that lags behind, if, there are wearing and tearing in the connecting rod bearing shell that is judged as this cylinder, can accurately judge a certain cylinder of engine that exists connecting rod bearing shell plucking or tile kilning risk in the engine cold test test process, avoid engine that plucking or tile kilning occur after the car load entrucking again, thereby the saving cost, improve user satisfaction.
Description of drawings
Fig. 1 is the process flow diagram of the engine piston top dead center position Time Domain Analysis of one embodiment of the invention;
Fig. 2 is the operating mode schematic diagram of the engine piston of one embodiment of the invention;
Fig. 3 is that the moment of torsion of one embodiment of the invention is the crank angle monitoring figure of zero position;
Fig. 4 is the module map of the engine piston top dead center position time-domain analysis system of one embodiment of the invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Embodiment one
As shown in Figures 1 to 3, the invention provides a kind of engine piston top dead center position Time Domain Analysis, comprise step S1～step S4.
step S1, at 14.5 ° to selecting the null position upper bound and the null position lower bound of the first cylinder of engine in the scope of 20.2 ° of crank angles, at 194.5 ° to selecting the null position upper bound and the null position lower bound of the 3rd cylinder of engine in the scope of 200.2 ° of crank angles, at 374.5 ° to selecting the null position upper bound and the null position lower bound of the 4th cylinder of engine in the scope of 380.2 ° of crank angles, at 554.5 ° to selecting the null position upper bound and the null position lower bound of the second cylinder of engine in the scope of 560.2 ° of crank angles, wherein, the null position upper bound of each cylinder is greater than the null position lower bound of this cylinder,
Preferably, the null position upper bound of the first cylinder of described engine and null position lower bound are respectively 14.5 ° and 20.2 ° of crank angles.
Preferably, the null position upper bound of the 3rd cylinder of described engine and null position lower bound are respectively 194.5 ° and 200.2 ° of crank angles.
Preferably, the null position upper bound of the 4th cylinder of described engine and null position lower bound are respectively 374.5 ° and 380.2 ° of crank angles.
Preferably, the null position upper bound of the 4th cylinder of described engine and null position lower bound are respectively 554.5 ° and 560.2 ° of crank angles.
Step S2, engine is carried out cold examination test, when the piston D of each cylinder of engine arrives top dead centre, if the input and output moment of torsion of the connecting rod bearing shell B that is connected with the piston of this cylinder of monitoring is whether the crank angle of zero position is in the null position upper bound and the scope between the null position lower bound of this cylinder, forward step S3 to, if not, forward step S4 to; Concrete, the cold examination measuring technology of the present embodiment can be applicable to as the form of standard all cold examination stand and engine model.
Step S3, there are not wearing and tearing in the connecting rod bearing shell that is judged as this cylinder;
Step S4, whether the crank angle that the further input and output moment of torsion of monitoring the connecting rod bearing shell of this cylinder is zero position is than 0.1～5 ° of crank angle of the null position upper bound of this cylinder hysteresis, if, the connecting rod bearing shell that is judged as this cylinder exists wearing and tearing concrete, the partly cause that causes the bearing shell tile kilning is that in engine oil channel, foreign matter causes the connecting rod bearing shell wearing and tearing, destroy oil film, bearing shell produces high temperature, causes plucking or tile kilning.Therefore, the present embodiment carries out cold examination test phase at engine just to be had connecting rod bearing shell the phenomenon of preliminary damage to monitor and in time isolates potential risk, avoids plucking or tile kilning occur again after the car load entrucking, reduces the loss and improves the satisfaction of downstream user.
Detailed, as shown in Figure 2, three friction pairs of engine the 3rd cylinder are respectively connecting rod piston piston pin A, connecting rod bearing shell B and main bearing shell C, under each operating mode three friction pairs of A, B and C under normal circumstances friction force be zero.As shown in Figure 3, the number of degrees that can crank angle are abscissa axis, with the output of connecting rod bearing shell and the size (Nm of input torque, ox rice) be ordinate, take coordinate axis zone that boundary line d under boundary line c on the null position perpendicular to abscissa axis and null position is surrounded as the monitoring window, this monitoring window can be controlled the defect of connecting rod bearing shell plucking or tile kilning.Operating mode 1 as shown in Figure 2, if each friction pair of the 3rd cylinder all without abnormal wearing and tearing, piston is during to top dead centre, the output of the connecting rod bearing shell of the 3rd cylinder and input torque are zero, i.e. cold examination torque curve zero crossing position a in Fig. 3; Operating mode 2 as shown in Figure 2, if connecting rod bearing shell early period of origination wearing and tearing, in operating mode 2, the B point can increase extra friction torque, this moment of resistance needs this cylinder pressure gas P acting to overcome, the output of the connecting rod bearing shell of the 3rd cylinder is that zero position can the relative described null position upper bound 0.1～5 ° of crank angle of hysteresis be cold examination torque curve zero crossing position b in Fig. 3 with input torque, and the number of degrees of the crank angle that specifically lags behind are different because of the connecting rod bearing shell degree of wear.In Fig. 3, a point is in the scope of described monitoring window, so there are not wearing and tearing in the connecting rod bearing shell of the 3rd cylinder, this engine is qualified, in Fig. 3, the b point exceeds the scope of described monitoring window, and the output of connecting rod bearing shell and input torque are zero position 0.1～5 ° of crank angle that can the relative described null position upper bound lags behind, so there are wearing and tearing in the connecting rod bearing shell of the 3rd cylinder, this engine is defective.
The present embodiment can accurately be judged the engine that exists connecting rod bearing shell plucking or tile kilning risk in the engine cold test test process, avoid engine that plucking or tile kilning occur again after the car load entrucking, thereby saves cost, improves user satisfaction.
Embodiment two
As shown in Figure 4, the present invention also provides another kind of engine piston top dead center position time-domain analysis system, comprises bound module 1, monitoring module 2, the first judge module 3 and the second judge module 4.
bound module 1, select the null position upper bound and the null position lower bound of the first cylinder of engine in the scope of 14.5 ° of crank angle to 20.2 ° crank angles, select the null position upper bound and the null position lower bound of the 3rd cylinder of engine in the scope of 194.5 ° of crank angle to 200.2 ° crank angles, select the null position upper bound and the null position lower bound of the 4th cylinder of engine in the scope of 374.5 ° of crank angle to 380.2 ° crank angles, select the null position upper bound and the null position lower bound of the second cylinder of engine in the scope of 554.5 ° of crank angle to 560.2 ° crank angles, wherein, the null position upper bound of each cylinder is greater than the null position lower bound of this cylinder,
Preferably, the null position upper bound and the null position lower bound of the first cylinder of the engine of described bound module 1 selection are respectively 14.5 ° and 20.2 ° of crank angles.
Preferably, the null position upper bound and the null position lower bound of the 3rd cylinder of the engine of described bound module 1 selection are respectively 194.5 ° and 200.2 ° of crank angles.
Preferably, the null position upper bound and the null position lower bound of the 4th cylinder of the engine of described bound module 1 selection are respectively 374.5 ° and 380.2 ° of crank angles.
Preferably, the null position upper bound and the null position lower bound of the 4th cylinder of the engine of described bound module 1 selection are respectively 554.5 ° and 560.2 ° of crank angles.
Monitoring module 2, be used for engine is carried out cold examination test, when the piston arrives top dead centre of each cylinder of engine, the input and output moment of torsion of the connecting rod bearing shell that monitoring is connected with the piston of this cylinder is whether the crank angle of zero position is in the null position upper bound and the scope between the null position lower bound of this cylinder;
The first judge module 3, the crank angle that is used for input and output moment of torsion when the connecting rod bearing shell of a certain cylinder and is zero position are in the null position upper bound of this cylinder and the scope between the null position lower bound time, and there are not wearing and tearing in the connecting rod bearing shell that is judged as this cylinder;
The second judge module 4, the crank angle that is used for input and output moment of torsion when a certain cylinder rod bearing shell and is zero position is not in the scope between this cylinder null position upper bound and null position lower bound the time, the input and output moment of torsion of further monitoring the connecting rod bearing shell of this cylinder is whether the crank angle of zero position is than the null position upper bound of this cylinder 0.1～5 ° of crank angle that lags behind, if there are wearing and tearing in the connecting rod bearing shell that is judged as this cylinder.
Other detailed content of embodiment two specifically can, referring to the appropriate section of embodiment one, not repeat them here.
the present invention selects the null position upper bound and the null position lower bound of the first cylinder of engine in the scope of 14.5 ° of crank angle to 20.2 ° crank angles, select the null position upper bound and the null position lower bound of the 3rd cylinder of engine in the scope of 194.5 ° of crank angle to 200.2 ° crank angles, select the null position upper bound and the null position lower bound of the 4th cylinder of engine in the scope of 374.5 ° of crank angle to 380.2 ° crank angles, select the null position upper bound and the null position lower bound of the second cylinder of engine in the scope of 554.5 ° of crank angle to 560.2 ° crank angles, wherein, the null position upper bound of each cylinder is greater than the null position lower bound of this cylinder, engine is carried out cold examination test, when the piston arrives top dead centre of each cylinder of engine, the input and output moment of torsion of the connecting rod bearing shell that monitoring is connected with the piston of this cylinder is whether the crank angle of zero position is in the null position upper bound and the scope between the null position lower bound of this cylinder, if there are not wearing and tearing in the connecting rod bearing shell that is judged as this cylinder, if not, the input and output moment of torsion of further monitoring the connecting rod bearing shell of this cylinder is whether the crank angle of zero position is than the null position upper bound of this cylinder 0.1～5 ° of crank angle that lags behind, if, there are wearing and tearing in the connecting rod bearing shell that is judged as this cylinder, can accurately judge a certain cylinder of engine that exists connecting rod bearing shell plucking or tile kilning risk in the engine cold test test process, avoid engine that plucking or tile kilning occur after the car load entrucking again, thereby the saving cost, improve user satisfaction.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that between each embodiment, identical similar part is mutually referring to getting final product.For the disclosed system of embodiment, owing to corresponding to the method disclosed in Example, so description is fairly simple, relevant part partly illustrates and gets final product referring to method.
The professional can also further recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or combination both, for the interchangeability of hardware and software clearly is described, composition and the step of each example described in general manner according to function in the above description.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.The professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought and exceeds scope of the present invention.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention invention.Like this, if within of the present invention these were revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention also was intended to comprise these change and modification.
Claims (10)
1. an engine piston top dead center position Time Domain Analysis, is characterized in that, comprising:
at 14.5 ° to selecting the null position upper bound and the null position lower bound of the first cylinder of engine in the scope of 20.2 ° of crank angles, at 194.5 ° to selecting the null position upper bound and the null position lower bound of the 3rd cylinder of engine in the scope of 200.2 ° of crank angles, at 374.5 ° to selecting the null position upper bound and the null position lower bound of the 4th cylinder of engine in the scope of 380.2 ° of crank angles, at 554.5 ° to selecting the null position upper bound and the null position lower bound of the second cylinder of engine in the scope of 560.2 ° of crank angles, wherein, the null position upper bound of each cylinder is greater than the null position lower bound of this cylinder,
Engine is carried out cold examination test, when the piston arrives top dead centre of each cylinder of engine, the input and output moment of torsion of the connecting rod bearing shell that monitoring is connected with the piston of this cylinder is whether the crank angle of zero position is in the null position upper bound and the scope between the null position lower bound of this cylinder;
If there are not wearing and tearing in the connecting rod bearing shell that is judged as this cylinder;
If not, the input and output moment of torsion of further monitoring the connecting rod bearing shell of this cylinder is whether the crank angle of zero position is than the null position upper bound of this cylinder 0.1～5 ° of crank angle that lags behind, if there are wearing and tearing in the connecting rod bearing shell that is judged as this cylinder.
2. engine piston top dead center position Time Domain Analysis as claimed in claim 1, is characterized in that, the null position upper bound of the first cylinder of described engine and null position lower bound are respectively 14.5 ° and 20.2 ° of crank angles.
3. engine piston top dead center position Time Domain Analysis as claimed in claim 1, is characterized in that, the null position upper bound of the 3rd cylinder of described engine and null position lower bound are respectively 194.5 ° and 200.2 ° of crank angles.
4. engine piston top dead center position Time Domain Analysis as claimed in claim 1, is characterized in that, the null position upper bound of the 4th cylinder of described engine and null position lower bound are respectively 374.5 ° and 380.2 ° of crank angles.
5. engine piston top dead center position Time Domain Analysis as claimed in claim 1, is characterized in that, the null position upper bound of the 4th cylinder of described engine and null position lower bound are respectively 554.5 ° and 560.2 ° of crank angles.
6. an engine piston top dead center position time-domain analysis system, is characterized in that, comprising:
the bound module, be used at 14.5 ° to the null position upper bound and the null position lower bound of selecting the first cylinder of engine in the scope of 20.2 ° of crank angles, at 194.5 ° to selecting the null position upper bound and the null position lower bound of the 3rd cylinder of engine in the scope of 200.2 ° of crank angles, at 374.5 ° to selecting the null position upper bound and the null position lower bound of the 4th cylinder of engine in the scope of 380.2 ° of crank angles, at 554.5 ° to selecting the null position upper bound and the null position lower bound of the second cylinder of engine in the scope of 560.2 ° of crank angles, wherein, the null position upper bound of each cylinder is greater than the null position lower bound of this cylinder,
Monitoring module, be used for engine is carried out cold examination test, when the piston arrives top dead centre of each cylinder of engine, the input and output moment of torsion of the connecting rod bearing shell that monitoring is connected with the piston of this cylinder is whether the crank angle of zero position is in the null position upper bound and the scope between the null position lower bound of this cylinder;
The first judge module, the crank angle that is used for input and output moment of torsion when the connecting rod bearing shell of a certain cylinder and is zero position are in the null position upper bound of this cylinder and the scope between the null position lower bound time, and there are not wearing and tearing in the connecting rod bearing shell that is judged as this cylinder;
The second judge module, the crank angle that is used for input and output moment of torsion when a certain cylinder rod bearing shell and is zero position is not in the scope between this cylinder null position upper bound and null position lower bound the time, the input and output moment of torsion of further monitoring the connecting rod bearing shell of this cylinder is whether the crank angle of zero position is than the null position upper bound of this cylinder 0.1～5 ° of crank angle that lags behind, if there are wearing and tearing in the connecting rod bearing shell that is judged as this cylinder.
7. engine piston top dead center position time-domain analysis system as claimed in claim 6, is characterized in that, the null position upper bound and the null position lower bound of the first cylinder of the engine that described bound module is selected are respectively 14.5 ° and 20.2 ° of crank angles.
8. engine piston top dead center position time-domain analysis system as claimed in claim 6, is characterized in that, the null position upper bound and the null position lower bound of the 3rd cylinder of the engine that described bound module is selected are respectively 194.5 ° and 200.2 ° of crank angles.
9. engine piston top dead center position time-domain analysis system as claimed in claim 6, is characterized in that, the null position upper bound and the null position lower bound of the 4th cylinder of the engine that described bound module is selected are respectively 374.5 ° and 380.2 ° of crank angles.
10. engine piston top dead center position time-domain analysis system as claimed in claim 6, is characterized in that, the null position upper bound and the null position lower bound of the 4th cylinder of the engine that described bound module is selected are respectively 554.5 ° and 560.2 ° of crank angles.
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| CN104048831A (en) * | 2014-03-12 | 2014-09-17 | 桂林电子科技大学 | Full working condition detecting method and device of position and phase position of piston of four-cylinder engine |
| CN107677356A (en) * | 2017-09-26 | 2018-02-09 | 重庆长安汽车股份有限公司 | The method of engine body abnormal sound is differentiated using vibration characteristics |
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| CN103389209B (en) | 2015-09-16 |
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