CN112069640B - Method and device for acquiring friction work of engine piston connecting rod system - Google Patents

Method and device for acquiring friction work of engine piston connecting rod system Download PDF

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Publication number
CN112069640B
CN112069640B CN201910424798.5A CN201910424798A CN112069640B CN 112069640 B CN112069640 B CN 112069640B CN 201910424798 A CN201910424798 A CN 201910424798A CN 112069640 B CN112069640 B CN 112069640B
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friction
piston
influence coefficient
piston ring
connecting rod
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CN112069640A (en
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张庆峰
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SAIC Motor Corp Ltd
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SAIC Motor Corp Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

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  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

The application discloses a method and a device for acquiring friction work of an engine piston connecting rod system, wherein the piston friction work is acquired by utilizing a piston friction calculation model according to piston friction parameter information; according to the friction parameter information of the piston ring, a friction calculation model of the piston ring is utilized to obtain friction work of the piston ring; according to the friction parameter information of the connecting rod, a friction calculation model of the connecting rod is utilized to obtain the friction work of the connecting rod; adding the piston friction work, the piston ring friction work and the connecting rod friction work to obtain the friction work of the engine piston connecting rod system; moreover, since the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model are all calculation models which are established in advance, the method can rapidly obtain the friction work of each part in the engine piston connecting rod system by utilizing the friction calculation models, so that the friction work of all parts is integrated to rapidly obtain the friction work of the engine piston connecting rod system.

Description

Method and device for acquiring friction work of engine piston connecting rod system
Technical Field
The application relates to the technical field of engines, in particular to a method and a device for acquiring friction work of an engine piston connecting rod system.
Background
The engine is a device for converting pressure generated by fuel combustion into rotational energy, and is a main power source of most vehicles; moreover, with the rapid development of engine technology, the working efficiency of an engine is becoming a concern in the field of engine technology.
According to the structure of the engine and the working principle of the engine, various factors influence the working efficiency of the engine, and different factors have different effects on the working efficiency of the engine. For example, the indicated thermal efficiency factor, the exhaust gas loss factor, the cooling loss factor, the friction loss factor, and the like all affect the operation efficiency of the engine, and the indicated thermal efficiency factor, the exhaust gas loss factor, the cooling loss factor, the friction loss factor, and the like have different effects on the operation efficiency of the engine. The friction loss factor is an important factor affecting the efficiency of the engine, and refers to kinetic energy loss caused by friction work between different components in the piston-connecting rod system of the engine when the engine works.
In order to determine the impact of friction losses on the operating efficiency of an engine, it is desirable to quickly obtain the friction work of the engine piston rod system. However, how to quickly obtain the friction work of the piston-connecting rod system of the engine is a technical problem to be solved in the prior art.
Disclosure of Invention
In order to solve the technical problems in the prior art, the application provides a method and a device for acquiring friction work of an engine piston connecting rod system, which can quickly acquire the friction work of the engine piston connecting rod system.
In order to achieve the above purpose, the technical scheme provided by the application is as follows:
the application provides a method for acquiring friction work of an engine piston connecting rod system, which comprises the following steps:
acquiring piston friction parameter information, piston ring friction parameter information and connecting rod friction parameter information;
according to the piston friction parameter information, a piston friction calculation model is utilized to obtain piston friction work; according to the friction parameter information of the piston ring, a friction calculation model of the piston ring is utilized to obtain friction work of the piston ring; according to the connecting rod friction parameter information, a connecting rod friction calculation model is utilized to obtain connecting rod friction work;
and obtaining the friction work of the engine piston connecting rod system according to the piston friction work, the piston ring friction work and the connecting rod friction work.
Optionally, the piston friction parameter information includes: at least one of oil viscosity, piston average speed, and bore;
the friction parameter information of the piston ring comprises: at least one of piston ring spring force, piston skirt roughness, engine speed, said bore, said oil viscosity, compression ratio, and said average piston speed;
The connecting rod friction parameter information comprises: at least one of the engine oil viscosity, the engine speed, a main bearing journal, a main bearing length, a number of main bearings, the bore, the stroke, and the number of cylinders.
Optionally, when the piston friction parameter information includes: when the engine oil viscosity, the average speed of the piston and the cylinder diameter are measured, the piston friction calculation model specifically comprises the following steps:
in which W is 1 Friction work for the piston; a is the friction influence coefficient of the piston; mu is the viscosity of engine oil; mu (mu) 0 Is the standard value of the viscosity of engine oil; s is S p Is the average velocity of the piston; b is the cylinder diameter;
when the friction parameter information of the piston ring comprises: the piston ring friction calculation model comprises the following specific steps of:
in which W is 2 Friction work for piston rings; b is a first friction influence coefficient of the piston ring; f (F) t The elastic force of the piston ring is adopted; f (F) 0 Is the standard value of the elasticity of the piston ring; c (C) r Is piston skirt roughness; c (C) r0 Is a standard value of the roughness of the skirt part of the piston; n is the engine speed; b is the cylinder diameter; c is a second friction influence coefficient of the piston ring; mu is the viscosity of engine oil; mu (mu) 0 Is the standard value of the viscosity of engine oil; r is (r) c Is the compression ratio; d is a third friction influence coefficient of the piston ring; k is a roughness constant; s is S p Is the average velocity of the piston;
when the link friction parameter information includes: the connecting rod friction calculation model specifically comprises the following components when the engine oil viscosity, the engine rotating speed, the main bearing journal, the main bearing length, the number of main bearings, the cylinder diameter, the stroke and the number of cylinders are equal to each other:
in which W is 3 Friction work is performed on the connecting rod; e is the friction influence coefficient of the connecting rod; mu is the viscosity of engine oil; n is the engine speed; d (D) b Is a main bearing journal; l (L) b The length of the main bearing; n is n b The number of the main bearings is the number of the main bearings; b is the cylinder diameter; s is the stroke; n (N) c The number of cylinders.
Optionally, the method further comprises:
acquiring a training set according to test data of an engine friction decomposition test;
and training the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model by utilizing the training set to obtain a piston friction influence coefficient a, a piston ring first friction influence coefficient b, a piston ring second friction influence coefficient c, a piston ring third friction influence coefficient d and a connecting rod friction influence coefficient e.
Optionally, training the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model by using the training set to obtain the piston friction influence coefficient a, the piston ring first friction influence coefficient b, the piston ring second friction influence coefficient c, the piston ring third friction influence coefficient d and the connecting rod friction influence coefficient e, specifically:
Inputting the data in the training set into the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model to obtain a piston friction influence coefficient set, a piston ring first friction influence coefficient set, a piston ring second friction influence coefficient set, a piston ring third friction influence coefficient set and a connecting rod friction influence coefficient set;
and obtaining the piston friction influence coefficient a, the piston ring first friction influence coefficient b, the piston ring second friction influence coefficient c, the piston ring third friction influence coefficient d and the connecting rod friction influence coefficient e by curve fitting and curve regression according to the piston friction influence coefficient set, the piston ring first friction influence coefficient set, the piston ring second friction influence coefficient set, the piston ring third friction influence coefficient set and the connecting rod friction influence coefficient set.
The application also provides a device for acquiring the friction work of the engine piston connecting rod system, which comprises the following components:
the first acquisition unit is used for acquiring piston friction parameter information, piston ring friction parameter information and connecting rod friction parameter information;
the second acquisition unit is used for acquiring piston friction work by using a piston friction calculation model according to the piston friction parameter information; according to the friction parameter information of the piston ring, a friction calculation model of the piston ring is utilized to obtain friction work of the piston ring; according to the connecting rod friction parameter information, a connecting rod friction calculation model is utilized to obtain connecting rod friction work;
And the third acquisition unit is used for acquiring the friction work of the engine piston and connecting rod system according to the piston friction work, the piston ring friction work and the connecting rod friction work.
Optionally, the piston friction parameter information includes: at least one of oil viscosity, piston average speed, and bore;
the friction parameter information of the piston ring comprises: at least one of piston ring spring force, piston skirt roughness, engine speed, said bore, said oil viscosity, compression ratio, and said average piston speed;
the connecting rod friction parameter information comprises: at least one of the engine oil viscosity, the engine speed, a main bearing journal, a main bearing length, a number of main bearings, the bore, the stroke, and the number of cylinders.
Optionally, when the piston friction parameter information includes: when the engine oil viscosity, the average speed of the piston and the cylinder diameter are measured, the piston friction calculation model specifically comprises the following steps:
in which W is 1 Friction work for the piston; a is the friction influence coefficient of the piston; mu is the viscosity of engine oil; mu (mu) 0 Is the standard value of the viscosity of engine oil; s is S p Is the average velocity of the piston; b is the cylinder diameter;
when the friction parameter information of the piston ring comprises: the piston ring friction calculation model comprises the following specific steps of:
In which W is 2 Friction work for piston rings; b is a first friction influence coefficient of the piston ring; f (F) t The elastic force of the piston ring is adopted; f (F) 0 Is the standard value of the elasticity of the piston ring; c (C) r Is piston skirt roughness; c (C) r0 Is a standard value of the roughness of the skirt part of the piston; n is the engine speed; b is the cylinder diameter; c is a second friction influence coefficient of the piston ring; mu is the viscosity of engine oil; mu (mu) 0 Is the standard value of the viscosity of engine oil; r is (r) c Is the compression ratio; d is a third friction influence coefficient of the piston ring; k is a roughness constant; s is S p Is the average velocity of the piston;
when the link friction parameter information includes: the connecting rod friction calculation model specifically comprises the following components when the engine oil viscosity, the engine rotating speed, the main bearing journal, the main bearing length, the number of main bearings, the cylinder diameter, the stroke and the number of cylinders are equal to each other:
in which W is 3 Friction work is performed on the connecting rod; e is the friction influence coefficient of the connecting rod; mu is the viscosity of engine oil; n is the engine speed; d (D) b Is a main bearing journal; l (L) b The length of the main bearing; n is n b The number of the main bearings is the number of the main bearings; b is the cylinder diameter; s is the stroke; n (N) c The number of cylinders.
Optionally, the method further comprises:
the fourth acquisition unit is used for acquiring a training set according to test data of an engine friction decomposition test;
and the fifth acquisition unit is used for training the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model by utilizing the training set to obtain the piston friction influence coefficient a, the piston ring first friction influence coefficient b, the piston ring second friction influence coefficient c, the piston ring third friction influence coefficient d and the connecting rod friction influence coefficient e.
Optionally, the fifth obtaining unit specifically includes:
the first acquisition subunit is used for inputting the data in the training set into the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model to obtain a piston friction influence coefficient set, a piston ring first friction influence coefficient set, a piston ring second friction influence coefficient set, a piston ring third friction influence coefficient set and a connecting rod friction influence coefficient set;
and the second obtaining subunit is used for obtaining the piston friction influence coefficient a, the piston ring first friction influence coefficient b, the piston ring second friction influence coefficient c, the piston ring third friction influence coefficient d and the connecting rod friction influence coefficient e by utilizing curve fitting and curve regression according to the piston friction influence coefficient set, the piston ring first friction influence coefficient set, the piston ring second friction influence coefficient set, the piston ring third friction influence coefficient set and the connecting rod friction influence coefficient set.
Compared with the prior art, the application has at least the following advantages:
according to the method for acquiring the friction work of the engine piston connecting rod system, the piston friction work is acquired by utilizing a piston friction calculation model according to the piston friction parameter information; according to the friction parameter information of the piston ring, a friction calculation model of the piston ring is utilized to obtain friction work of the piston ring; according to the friction parameter information of the connecting rod, a friction calculation model of the connecting rod is utilized to obtain the friction work of the connecting rod; adding the piston friction work, the piston ring friction work and the connecting rod friction work to obtain the friction work of the engine piston connecting rod system; moreover, since the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model are all calculation models which are established in advance, the method can rapidly obtain the friction work of each part in the engine piston connecting rod system by utilizing the friction calculation models, so that the friction work of all parts is integrated to rapidly obtain the friction work of the engine piston connecting rod system.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for obtaining friction work of an engine piston rod system according to a first embodiment of the present application;
fig. 2 is a schematic diagram of a specific implementation of S101 according to an embodiment of the present application;
FIG. 3 is a flow chart of a method for obtaining friction work of an engine piston rod system according to a second embodiment of the present application;
FIG. 4 is a flowchart of an implementation of S301 provided in an embodiment of the present application;
FIG. 5 is a flowchart of an implementation of S302 provided in an embodiment of the present application;
fig. 6 is a flowchart of a specific implementation of S3021 provided in an embodiment of the present application;
FIG. 7 is a flow chart of one implementation of S3022 provided by an embodiment of the present application;
fig. 8 is a schematic structural diagram of an apparatus for acquiring friction work of an engine piston connecting rod system according to an embodiment of the present application.
Detailed Description
In order to make the present application better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Method embodiment one
Referring to fig. 1, a flowchart of a method for acquiring friction work of an engine piston connecting rod system according to a first embodiment of the present application is shown.
The method for acquiring the friction work of the engine piston connecting rod system provided by the embodiment of the application comprises the following steps:
s101: and acquiring piston friction parameter information, piston ring friction parameter information and connecting rod friction parameter information.
The specific implementation of this step will be described in detail below.
S102: and according to the piston friction parameter information, acquiring piston friction work by using a piston friction calculation model.
The specific implementation of this step will be described in detail below.
S103: and according to the friction parameter information of the piston ring, acquiring the friction work of the piston ring by using a friction calculation model of the piston ring.
The specific implementation of this step will be described in detail below.
S104: and according to the friction parameter information of the connecting rod, acquiring the friction work of the connecting rod by using a friction calculation model of the connecting rod.
The specific implementation of this step will be described in detail below.
S105: and obtaining the friction work of the engine piston-connecting rod system according to the piston friction work, the piston ring friction work and the connecting rod friction work.
The specific implementation of this step will be described in detail below.
It should be noted that, there is no fixed execution sequence among S102, S103 and S104, S102, S103 and S104 may be sequentially executed, S103, S102 and S104 may be sequentially executed, S103, S104 and S102 may be sequentially executed, S104, S102 and S103 may be sequentially executed, S104, S103 and S102 may be sequentially executed, and S102, S103 and S104 may be simultaneously executed, and the execution sequence among S102, S103 and S104 is not specifically limited in the present application.
The above is a specific implementation step of the method for obtaining the friction work of the engine piston connecting rod system provided by the embodiment of the present application, and in order to facilitate understanding and explanation of the method for obtaining the friction work of the engine piston connecting rod system provided by the embodiment of the present application, specific implementation manners of S101 to S105 will be sequentially described below.
First, a specific embodiment of S101 will be described.
In S101, the piston friction parameter information refers to parameter information related to piston friction work, and the piston friction parameter information may include at least one parameter information. As an example, the piston friction parameter information may specifically include: at least one of oil viscosity, piston average speed, and bore.
The piston ring friction parameter information refers to parameter information related to piston ring friction work, and the piston ring friction parameter information may include at least one parameter information. As an example, the piston ring friction parameter information includes: at least one of piston ring spring force, piston skirt roughness, engine speed, cylinder diameter, oil viscosity, compression ratio, and average piston speed.
The link friction parameter information refers to parameter information related to link friction work, and the link friction parameter information may include at least one parameter information. As an example, the link friction parameter information includes: at least one of engine oil viscosity, engine speed, main bearing journal, main bearing length, main bearing count, bore, stroke, and cylinder count.
S101 may be implemented in various ways, and will be explained and illustrated below by taking an embodiment as an example with reference to fig. 2, where fig. 2 is a specific implementation of S101 provided in an embodiment of the present application.
As an embodiment, S101 may specifically be:
s1011: and acquiring the friction parameter information of the piston.
S1012: and acquiring friction parameter information of the piston ring.
S1013: and acquiring friction parameter information of the connecting rod.
In the embodiment of the present application, there is no fixed execution order between S1011, S1012, and S1013, and S1011, S1012, and S1013 may be sequentially executed, S1011, S1013, and S1012 may be sequentially executed, S1012, S1013, and S1011 may be sequentially executed, S1013, S1012, and S1011 may be sequentially executed, S1013, S1011, and S1012 may be sequentially executed, and S1011, S1012, and S1013 may be simultaneously executed, and the execution order between S1011, S1012, and S1013 is not particularly limited.
In the specific embodiment of S201, in S201, the piston friction parameter information, the piston ring friction parameter information, and the connecting rod friction parameter information may be obtained, so that the piston friction work, the piston ring friction work, and the connecting rod friction work may be calculated by using the obtained piston friction parameter information, piston ring friction parameter information, and connecting rod friction parameter information, respectively.
A specific embodiment of S102 will be described below.
As one embodiment, when the piston friction parameter information includes: when at least one of the viscosity of the engine oil, the average speed of the piston, and the cylinder diameter is at least one, S102 may specifically be: and obtaining the piston friction work by using a piston friction calculation model according to at least one parameter information of the engine oil viscosity, the average speed of the piston and the cylinder diameter.
In S102, the piston friction calculation model may be preset, may be determined in advance according to an actual application scenario, or may be obtained by training in advance according to a training set.
In addition, when the piston friction parameter information includes: when the engine oil viscosity, the average speed of the piston and the cylinder diameter are measured, the piston friction calculation model specifically comprises the following steps:
in which W is 1 Friction work for the piston; a is the friction influence coefficient of the piston; mu is the viscosity of engine oil; mu (mu) 0 Is the standard value of the viscosity of engine oil; s is S p Is the average velocity of the piston; b is the cylinder diameter.
It should be noted that, the coefficient of friction influence a of the piston may be preset, or may be determined according to the actual application scenario.
As a more specific embodiment, when the piston friction parameter information includes: when the viscosity of the engine oil, the average speed of the piston and the cylinder diameter are the same, S102 may specifically be: and (3) calculating by using a calculation formula (1) according to the viscosity of the engine oil, the average speed of the piston and the cylinder diameter to obtain the friction work of the piston.
In the specific embodiment of S102, in S102, the piston friction work may be obtained by using a piston friction calculation model according to the piston friction parameter information, so that the friction work of the engine piston connecting rod system can be determined according to the piston friction work.
A specific embodiment of S103 will be described below.
As one embodiment, when the piston ring friction parameter information includes: in the case of at least one of piston ring elasticity, piston skirt roughness, engine speed, cylinder diameter, engine oil viscosity, compression ratio, and average piston speed, S103 may specifically be: and obtaining the friction work of the piston ring by using a friction calculation model of the piston ring according to at least one parameter information of the elasticity of the piston ring, the roughness of the skirt part of the piston, the rotating speed of the engine, the cylinder diameter, the viscosity of engine oil, the compression ratio and the average speed of the piston.
In S103, the piston ring friction calculation model may be preset, may be determined in advance according to an actual application scenario, or may be obtained by training in advance according to a training set.
In addition, when the piston ring friction parameter information includes: the piston ring friction calculation model comprises the following concrete steps of:
In which W is 2 Friction work for piston rings; b is a first friction influence coefficient of the piston ring; f (F) t The elastic force of the piston ring is adopted; f (F) 0 Is the standard value of the elasticity of the piston ring; c (C) r Is a piston skirtA portion roughness; c (C) r0 Is a standard value of the roughness of the skirt part of the piston; n is the engine speed; b is the cylinder diameter; c is a second friction influence coefficient of the piston ring; mu is the viscosity of engine oil; mu (mu) 0 Is the standard value of the viscosity of engine oil; r is (r) c Is the compression ratio; d is a third friction influence coefficient of the piston ring; k is a roughness constant; s is S p Is the average velocity of the piston.
Wherein the roughness constant K can be preset to be 1.4X10 -2 。
It should be noted that, the first friction influence coefficient b of the piston ring may be preset, or may be determined according to an actual application scenario; the second friction influence coefficient c of the piston ring can be preset or determined according to the actual application scene; the third friction influence coefficient d of the piston ring can be preset or determined according to the actual application scene.
As a more specific embodiment, when the piston ring friction parameter information includes: when the piston ring elasticity, the piston skirt roughness, the engine speed, the cylinder diameter, the engine oil viscosity, the compression ratio and the average piston speed are, S103 may specifically be: and (3) calculating by using a calculation formula (2) according to the elasticity of the piston ring, the roughness of the piston skirt, the engine speed, the cylinder diameter, the viscosity of engine oil, the compression ratio and the average speed of the piston to obtain the friction work of the piston ring.
In the specific embodiment of S103, in S103, the piston ring friction work may be obtained by using a piston ring friction calculation model according to the piston ring friction parameter information, so that the friction work of the engine piston connecting rod system can be determined according to the piston ring friction work.
A specific embodiment of S104 will be described below.
As one embodiment, when the link friction parameter information includes: when at least one of the engine oil viscosity, the engine speed, the main bearing journal, the main bearing length, the number of main bearings, the cylinder diameter, the stroke, and the number of cylinders is at least one, the specific details of S104 may be: and obtaining the friction work of the connecting rod by using a friction calculation model of the connecting rod according to at least one information of the engine oil viscosity, the engine rotating speed, the main bearing journal, the main bearing length, the number of main bearings, the cylinder diameter, the stroke and the number of cylinders.
In S104, the link friction calculation model may be preset, or may be determined in advance according to an actual application scenario, or may be obtained by training in advance according to a training set.
In addition, when the link friction parameter information includes: the connecting rod friction calculation model comprises the following concrete steps of:
In which W is 3 Friction work is performed on the connecting rod; e is the friction influence coefficient of the connecting rod; mu is the viscosity of engine oil; n is the engine speed; d (D) b Is a main bearing journal; l (L) b The length of the main bearing; n is n b The number of the main bearings is the number of the main bearings; b is the cylinder diameter; s is the stroke; n (N) c The number of cylinders.
It should be noted that, the coefficient of friction influence e of the connecting rod may be preset, or may be determined according to an actual application scenario.
As a more specific embodiment, when the link friction parameter information includes: when the engine oil viscosity, the engine speed, the main bearing journal, the main bearing length, the number of main bearings, the cylinder diameter, the stroke and the number of cylinders, S104 may specifically be: and calculating according to the engine oil viscosity, the engine speed, the main bearing journal, the main bearing length, the number of main bearings, the cylinder diameter, the stroke and the number of cylinders by using a calculation formula (3) to obtain the friction work of the connecting rod.
In the specific embodiment of S104, in S104, the connecting rod friction work may be obtained according to the connecting rod friction parameter information by using the connecting rod friction calculation model, so that the friction work of the engine piston-connecting rod system can be determined according to the piston ring friction work.
A specific embodiment of S105 will be described below.
Since engine piston rod system friction losses are mainly composed of piston skirt friction losses, piston ring friction losses and connecting rod small end friction losses, engine piston rod system friction mainly originates from 3 engine parts: piston, piston ring and connecting rod. It is known that the friction work of the engine piston-connecting rod system is the sum of the piston friction work, the piston ring friction work and the connecting rod friction work.
Thus, as an embodiment, S105 may specifically be: and adding the piston friction work, the piston ring friction work and the connecting rod friction work to obtain the friction work of the engine piston connecting rod system.
In the specific embodiment of S105, in S105, the piston friction work, the piston ring friction work, and the connecting rod friction work may be summed to obtain the engine piston connecting rod system friction work.
The above is a specific implementation manner of the method for obtaining the friction work of the piston-connecting rod system of the engine provided in the first embodiment of the method of the present application, in this implementation manner, the piston friction work is obtained by using a piston friction calculation model according to the piston friction parameter information; according to the friction parameter information of the piston ring, a friction calculation model of the piston ring is utilized to obtain friction work of the piston ring; according to the friction parameter information of the connecting rod, a friction calculation model of the connecting rod is utilized to obtain the friction work of the connecting rod; adding the piston friction work, the piston ring friction work and the connecting rod friction work to obtain the friction work of the engine piston connecting rod system; moreover, since the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model are all calculation models which are established in advance, the method can rapidly obtain the friction work of each part in the engine piston connecting rod system by utilizing the friction calculation models, so that the friction work of all parts is integrated to rapidly obtain the friction work of the engine piston connecting rod system.
According to the method for acquiring the friction work of the engine piston connecting rod system, which is provided by the embodiment of the method, the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model can be utilized to quickly acquire the piston friction work, the piston ring friction work and the connecting rod friction work, so that the engine piston connecting rod system friction work is acquired according to the piston friction work, the piston ring friction work and the connecting rod friction work.
In addition, since the piston friction influence coefficient a will influence the calculation accuracy of the piston friction calculation model, the piston ring first friction influence coefficient b, the piston ring second friction influence coefficient c and the piston ring third friction influence coefficient d will all influence the calculation accuracy of the piston ring friction calculation model, and the connecting rod friction influence coefficient e will influence the calculation accuracy of the connecting rod friction calculation model, in order to improve the calculation accuracy of the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model can be trained by training sets in advance, so that the accurate piston friction influence coefficient a, the piston ring first friction influence coefficient b, the piston ring second friction influence coefficient c, the piston ring third friction influence coefficient d and the connecting rod friction influence coefficient e are obtained. Accordingly, the present application provides another embodiment of a method for obtaining friction work in an engine piston rod system, as will be explained and illustrated with reference to the accompanying drawings.
Method embodiment II
The second embodiment of the method is an improvement based on the first embodiment of the method, and for brevity, the same parts as those in the first embodiment of the method are not described herein.
Referring to fig. 3, a flowchart of a method for obtaining friction work of an engine piston connecting rod system according to a second embodiment of the present application is shown.
The method for acquiring the friction work of the engine piston connecting rod system provided by the embodiment of the application comprises the following steps:
s301: and acquiring a training set according to test data of the engine friction decomposition test.
The engine friction breakdown test is a test in which engine friction parts are broken down on an engine mount according to preset steps and friction work of each part is tested.
The test data of the engine friction break-up test refer to the friction parameter data and the friction work data of different test parts in the engine obtained in the engine friction break-up test.
As an example: and carrying out an engine friction decomposition test under a preset boundary condition and a preset engine rotating speed to obtain piston friction work, piston ring friction work, connecting rod friction work and piston connecting rod system friction work, and recording friction parameter data in the decomposition test and obtained friction work data.
Wherein, the preset boundary condition comprises: engine oil temperature conditions, coolant temperature and other conditions; and the preset boundary conditions may be preset.
In addition, the preset engine speed may be preset.
S301 may be implemented in various ways, and an embodiment will be described below with reference to fig. 4, where fig. 4 is a flowchart of an implementation of S301 provided in an embodiment of the present application.
As an embodiment, S301 specifically includes:
s3011: boundary data sets including N different boundary conditions are preset, and rotational speed data sets including N different engine rotational speeds are preset.
S3012: selecting the 1 st boundary condition from the boundary data set and selecting the 1 st engine speed from the speed data set, carrying out an engine friction decomposition test under the 1 st boundary condition and the 1 st engine speed, and taking friction parameter data and friction work data in the decomposition test as 1 st training data.
S3013: selecting the 2 nd boundary condition from the boundary data set and selecting the 2 nd engine speed from the speed data set, carrying out an engine friction decomposition test under the 2 nd boundary condition and the 2 nd engine speed, and taking friction parameter data and friction work data in the decomposition test as the 2 nd training data.
Sequentially and repeatedly executing the selection of the ith boundary condition from the boundary data set and the selection of the ith engine speed from the speed data set, carrying out an engine friction decomposition test under the ith boundary condition and the ith engine speed, and taking friction parameter data and friction work data in the decomposition test as ith training data; wherein i is less than or equal to N and i is a positive integer.
S3014: selecting an Nth boundary condition from the boundary data set and selecting an Nth engine speed from the speed data set, carrying out an engine friction decomposition test under the Nth boundary condition and the Nth engine speed, and taking friction parameter data and friction work data in the decomposition test as an Nth training data.
S3015: and obtaining a training set according to the 1 st training data, the 2 nd training data, the … … th training data and the N th training data.
In the embodiment, through carrying out engine friction decomposition experiments under different boundary conditions and different engine speeds, friction parameter data and friction work data under various engine states are obtained, and the obtained data in the training set can be ensured to be closer to relevant data of an actual engine, so that the accuracy of a piston friction influence coefficient a, a piston ring first friction influence coefficient b, a piston ring second friction influence coefficient c, a piston ring third friction influence coefficient d and a connecting rod friction influence coefficient e obtained by training by using the training set is improved, and a, b, c, d and e are closer to actual values of relevant parameters in an engine piston connecting rod system, and further the accuracy of a piston friction calculation model, a piston ring friction calculation model and a connecting rod friction calculation model is improved.
S302: and training the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model by utilizing the training set to obtain a piston friction influence coefficient a, a piston ring first friction influence coefficient b, a piston ring second friction influence coefficient c, a piston ring third friction influence coefficient d and a connecting rod friction influence coefficient e.
S302 may take a variety of embodiments, and two embodiments will be explained and illustrated below as examples.
Referring to fig. 5, a flowchart of one implementation of S302 provided by an embodiment of the present application is shown.
As an embodiment, S302 may specifically be:
s3021: and inputting the data in the training set into a piston friction calculation model, a piston ring friction calculation model and a connecting rod friction calculation model to obtain a piston friction influence coefficient set, a piston ring first friction influence coefficient set, a piston ring second friction influence coefficient set, a piston ring third friction influence coefficient set and a connecting rod friction influence coefficient set.
Referring to fig. 6, a flowchart of a specific implementation of S3021 provided in an embodiment of the present application is shown.
As an embodiment, S3021 may specifically be:
s30211: and inputting the data in the training set into a piston friction calculation model to obtain a piston friction influence coefficient set.
S30212: and inputting the data in the training set into a piston ring friction calculation model to obtain a first friction influence coefficient set of the piston ring, a second friction influence coefficient set of the piston ring and a third friction influence coefficient set of the piston ring.
S30213: and inputting the data in the training set into a connecting rod friction calculation model to obtain a connecting rod friction influence coefficient set.
In the embodiment of the present application, there is no fixed execution sequence among S30211, S30212 and S30213, S30211, S30212 and S30213 may be sequentially executed, S30211, S30213 and S30212 may be sequentially executed, S30212, S30211 and S30213 may be sequentially executed, S30212, S30213 and S30211 may be sequentially executed, S30213, S30212 and S30211 may be sequentially executed, S30213, S30211 and S30212 may be sequentially executed, S30211, S30212 and S30213 may be simultaneously executed, and the execution sequence among S30211, S30212 and S30213 is not particularly limited.
In the embodiment of S3021 provided above, training is performed by inputting training sets into the piston friction calculation model, the piston ring friction calculation model, and the connecting rod friction calculation model, respectively, and a piston friction influence coefficient set, a piston ring first friction influence coefficient set, a piston ring second friction influence coefficient set, a piston ring third friction influence coefficient set, and a connecting rod friction influence coefficient set are obtained, respectively.
In addition, the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model can be integrated to obtain an engine piston connecting rod system friction calculation total model, and at the moment, the engine piston connecting rod system friction calculation total model can be used for calculating engine piston connecting rod system friction work.
As an example, when the piston friction parameter information includes: the engine oil viscosity, the average speed of the piston and the cylinder diameter, and the friction parameter information of the piston ring comprises the following information: piston ring elasticity, piston skirt roughness, engine speed, cylinder diameter, oil viscosity, compression ratio and average piston speed, and connecting rod friction parameter information includes: when the engine oil viscosity, the engine speed, the main bearing journal, the main bearing length, the main bearing number, the cylinder diameter, the stroke and the cylinder number are used, the total friction calculation model of the engine piston connecting rod system can be specifically:
in which W is A Friction work for the engine piston rod system; a is the friction influence coefficient of the piston; mu is the viscosity of engine oil; mu (mu) 0 Is the standard value of the viscosity of engine oil; s is S p Is the average velocity of the piston; b is the cylinder diameter; b is a first friction influence coefficient of the piston ring; f (F) t The elastic force of the piston ring is adopted; f (F) 0 Is the standard value of the elasticity of the piston ring; c (C) r Is piston skirt roughness; c (C) r0 Is a standard value of the roughness of the skirt part of the piston; n is the engine speed; b is the cylinder diameter; c is a second friction influence coefficient of the piston ring; mu is the viscosity of engine oil; mu (mu) 0 Is the standard value of the viscosity of engine oil; r is (r) c Is the compression ratio; d is a third friction influence coefficient of the piston ring; k is a roughness constant; s is S p Is the average velocity of the piston; e is the friction influence coefficient of the connecting rod; mu is the viscosity of engine oil; n is the engine speed; d (D) b Is a main bearing journal; l (L) b The length of the main bearing; n is n b The number of the main bearings is the number of the main bearings; b is the cylinder diameter; s is the stroke; n (N) c The number of cylinders.
Thus, as another embodiment, S3021 may specifically be: and inputting the data in the training set into a friction calculation total model of the engine piston-connecting rod system to obtain a piston friction influence coefficient set, a piston ring first friction influence coefficient set, a piston ring second friction influence coefficient set, a piston ring third friction influence coefficient set and a connecting rod friction influence coefficient set.
As a more specific embodiment, S3021 may specifically be: and (3) inputting the data in the training set into a calculation formula (4) to obtain a piston friction influence coefficient set, a piston ring first friction influence coefficient set, a piston ring second friction influence coefficient set, a piston ring third friction influence coefficient set and a connecting rod friction influence coefficient set.
S3022: and obtaining a piston friction influence coefficient a, a piston ring first friction influence coefficient b, a piston ring second friction influence coefficient c, a piston ring third friction influence coefficient d and a connecting rod friction influence coefficient e by curve fitting and curve regression according to the piston friction influence coefficient set, the piston ring first friction influence coefficient set, the piston ring second friction influence coefficient set, the piston ring third friction influence coefficient set and the connecting rod friction influence coefficient set.
S3022 may take various embodiments, and will be described below by taking one embodiment as an example.
Referring to fig. 7, a flowchart of an implementation of S3022 provided in an embodiment of the present application is shown.
As an embodiment, S3022 may specifically be:
s30221: and obtaining a piston friction influence coefficient a by utilizing curve fitting and curve regression according to the piston friction influence coefficient set.
As an embodiment, S30221 may specifically be: firstly, according to a piston friction influence coefficient set, fitting by utilizing a curve to obtain a fitting curve of a piston friction influence coefficient a; and then carrying out curve regression on the fitted curve of the piston friction influence coefficient a to obtain the piston friction influence coefficient a.
S30222: and obtaining a first friction influence coefficient b of the piston ring by utilizing curve fitting and curve regression according to the first friction influence coefficient set of the piston ring.
As an embodiment, S30222 may specifically be: firstly, according to a first friction influence coefficient set of a piston ring, fitting by utilizing a curve to obtain a fitting curve of a first friction influence coefficient b of the piston ring; and then carrying out curve regression on the fitted curve of the first friction influence coefficient b of the piston ring to obtain the first friction influence coefficient b of the piston ring.
S30223: and obtaining a second friction influence coefficient c of the piston ring by utilizing curve fitting and curve regression according to the second friction influence coefficient set of the piston ring.
As an embodiment, S30223 may specifically be: firstly, according to a second friction influence coefficient set of the piston ring, fitting by utilizing a curve to obtain a fitting curve of a second friction influence coefficient c of the piston ring; and then carrying out curve regression on the fitted curve of the second friction influence coefficient c of the piston ring to obtain the second friction influence coefficient c of the piston ring.
S30224: and obtaining a third friction influence coefficient d of the piston ring by utilizing curve fitting and curve regression according to the third friction influence coefficient set of the piston ring.
As an embodiment, S30224 may specifically be: firstly, fitting by utilizing a curve according to a third friction influence coefficient set of the piston ring to obtain a fitting curve of a third friction influence coefficient d of the piston ring; and then carrying out curve regression on the fitted curve of the third friction influence coefficient d of the piston ring to obtain the third friction influence coefficient d of the piston ring.
S30225: and obtaining a connecting rod friction influence coefficient e by utilizing curve fitting and curve regression according to the connecting rod friction influence coefficient set.
As an embodiment, S30225 may specifically be: firstly, according to a connecting rod friction influence coefficient set, fitting by utilizing a curve to obtain a fitting curve of a connecting rod friction influence coefficient e; and then carrying out curve regression on the fitting curve of the friction influence coefficient e of the connecting rod to obtain the friction influence coefficient e of the connecting rod.
It should be noted that, there is no fixed execution sequence among S30221, S30222, S30223, S30224, and S30225, S30221, S30222, S30223, S30224, and S30225 may be sequentially executed, S30223, S30221, S30222, S30224, and S30225 may be sequentially executed, and the execution sequence among S30221, S30222, S30223, S30224, and S30225 may be executed in other execution sequences.
S303: and acquiring piston friction parameter information, piston ring friction parameter information and connecting rod friction parameter information.
The specific embodiment of S303 is the same as the specific embodiment of S101, and will not be described here again.
S304: and according to the piston friction parameter information, acquiring piston friction work by using a piston friction calculation model.
The specific embodiment of S304 is the same as the specific embodiment of S102, and will not be described here again.
S305: and according to the friction parameter information of the piston ring, acquiring the friction work of the piston ring by using a friction calculation model of the piston ring.
The specific embodiment of S305 is the same as the specific embodiment of S103, and will not be described here again.
S306: and according to the friction parameter information of the connecting rod, acquiring the friction work of the connecting rod by using a friction calculation model of the connecting rod.
The specific embodiment of S306 is the same as the specific embodiment of S104, and will not be described here again.
S307: and adding the piston friction work, the piston ring friction work and the connecting rod friction work to obtain the friction work of the engine piston connecting rod system.
The specific embodiment of S307 is the same as the specific embodiment of S105, and will not be described here again.
In the specific implementation manner of the method for obtaining the friction work of the engine piston connecting rod system provided in the second method embodiment, the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model are trained by using the training set including the test result data of the engine friction decomposition test, so that the more accurate piston friction influence coefficient a, the piston ring first friction influence coefficient b, the piston ring second friction influence coefficient c, the piston ring third friction influence coefficient d and the connecting rod friction influence coefficient e are obtained, and the accuracy of the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model is improved, so that the accuracy of the piston friction work, the piston ring friction work and the connecting rod friction work obtained by the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model is improved.
The above method embodiment one and method embodiment two provide specific embodiments of a method for obtaining a friction work of an engine piston-connecting rod system, in which a piston friction work, a piston ring friction work, and a connecting rod friction work can be quickly obtained using an established piston friction calculation model, a piston ring friction calculation model, and a connecting rod friction calculation model, so that the engine piston-connecting rod system friction work can be quickly obtained subsequently according to the piston friction work, the piston ring friction work, and the connecting rod friction work.
In addition, based on the method for acquiring the friction work of the piston rod system of the engine provided by the first method embodiment and the second method embodiment, the embodiment of the application further provides a device for acquiring the friction work of the piston rod system of the engine, which is explained and illustrated below with reference to the accompanying drawings.
Device embodiment 1
Referring to fig. 8, a schematic structural diagram of an apparatus for acquiring friction work of an engine piston rod system according to an embodiment of the present application is shown.
The device for acquiring the friction work of the engine piston connecting rod system provided by the embodiment of the application comprises the following components:
a first obtaining unit 801, configured to obtain piston friction parameter information, piston ring friction parameter information, and connecting rod friction parameter information;
A second obtaining unit 802, configured to obtain a piston friction work according to the piston friction parameter information by using a piston friction calculation model; according to the friction parameter information of the piston ring, a friction calculation model of the piston ring is utilized to obtain friction work of the piston ring; according to the friction parameter information of the connecting rod, a friction calculation model of the connecting rod is utilized to obtain the friction work of the connecting rod;
and a third acquiring unit 803, configured to acquire the friction work of the piston-connecting rod system of the engine according to the piston friction work, the piston ring friction work and the connecting rod friction work.
In one embodiment, to further improve accuracy of the obtained friction work of the piston-connecting rod system of the engine, the piston friction parameter information includes: at least one of oil viscosity, piston average speed, and bore;
the friction parameter information of the piston ring comprises: at least one of piston ring elasticity, piston skirt roughness, engine speed, cylinder diameter, oil viscosity, compression ratio, and average piston speed;
the connecting rod friction parameter information comprises: at least one of engine oil viscosity, engine speed, main bearing journal, main bearing length, main bearing count, bore, stroke, and cylinder count.
In one embodiment, in order to further improve accuracy of the obtained friction work of the piston-connecting rod system of the engine, when the piston friction parameter information includes: when the engine oil viscosity, the average speed of the piston and the cylinder diameter are measured, the piston friction calculation model specifically comprises the following steps:
In which W is 1 Friction work for the piston; a is the friction influence coefficient of the piston; mu is the viscosity of engine oil; mu (mu) 0 Is the standard value of the viscosity of engine oil; s is S p Is the average velocity of the piston; b is the cylinder diameter;
when the friction parameter information of the piston ring comprises: the piston ring friction calculation model comprises the following concrete steps of:
in which W is 2 Friction work for piston rings; b is a first friction influence coefficient of the piston ring; f (F) t The elastic force of the piston ring is adopted; f (F) 0 Is the standard value of the elasticity of the piston ring; c (C) r Is piston skirt roughness; c (C) r0 Is a standard value of the roughness of the skirt part of the piston; n is the engine speed; b is the cylinder diameter; c is a second friction influence coefficient of the piston ring; mu is the viscosity of engine oil; mu (mu) 0 Is the standard value of the viscosity of engine oil; r is (r) c Is the compression ratio; d is a third friction influence coefficient of the piston ring; k is a roughness constant; s is S p Is the average velocity of the piston;
when the connecting rod friction parameter information includes: the connecting rod friction calculation model comprises the following concrete steps of:
in which W is 3 Friction work is performed on the connecting rod; e is the friction influence coefficient of the connecting rod; mu is the viscosity of engine oil; n is the engine speed; d (D) b Is a main bearing journal; l (L) b The length of the main bearing; n is n b The number of the main bearings is the number of the main bearings; b is the cylinder diameter; s is the stroke; n (N) c The number of cylinders.
In order to further improve accuracy of the obtained friction work of the piston-connecting rod system of the engine, as one embodiment, the device for obtaining the friction work of the piston-connecting rod system of the engine further comprises:
the fourth acquisition unit is used for acquiring a training set according to test data of an engine friction decomposition test;
and the fifth acquisition unit is used for training the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model by utilizing the training set to obtain a piston friction influence coefficient a, a piston ring first friction influence coefficient b, a piston ring second friction influence coefficient c, a piston ring third friction influence coefficient d and a connecting rod friction influence coefficient e.
As an embodiment, in order to further improve accuracy of the obtained friction work of the engine piston connecting rod system, the fifth obtaining unit specifically includes:
the first acquisition subunit is used for inputting data in the training set into the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model to obtain a piston friction influence coefficient set, a piston ring first friction influence coefficient set, a piston ring second friction influence coefficient set, a piston ring third friction influence coefficient set and a connecting rod friction influence coefficient set;
The second obtaining subunit is configured to obtain, according to the piston friction influence coefficient set, the piston ring first friction influence coefficient set, the piston ring second friction influence coefficient set, the piston ring third friction influence coefficient set, and the connecting rod friction influence coefficient set, a piston friction influence coefficient a, a piston ring first friction influence coefficient b, a piston ring second friction influence coefficient c, a piston ring third friction influence coefficient d, and a connecting rod friction influence coefficient e by using curve fitting and curve regression.
The device for acquiring the friction work of the piston-connecting rod system of the engine provided by the first embodiment of the device of the present application is used for acquiring the piston friction work by using a piston friction calculation model according to the piston friction parameter information; according to the friction parameter information of the piston ring, a friction calculation model of the piston ring is utilized to obtain friction work of the piston ring; according to the friction parameter information of the connecting rod, a friction calculation model of the connecting rod is utilized to obtain the friction work of the connecting rod; adding the piston friction work, the piston ring friction work and the connecting rod friction work to obtain the friction work of the engine piston connecting rod system; moreover, since the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model are all calculation models which are established in advance, the device can rapidly obtain the friction work of each part in the engine piston connecting rod system by utilizing the friction calculation models, so that the friction work of all parts is integrated to rapidly obtain the friction work of the engine piston connecting rod system.
It should be understood that in the present application, "at least one (item)" means one or more, and "a plurality" means two or more. "and/or" for describing the association relationship of the association object, the representation may have three relationships, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
The above is merely a preferred embodiment of the present application, and is not intended to limit the present application in any way. While the application has been described with reference to preferred embodiments, it is not intended to be limiting. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present application or modifications to equivalent embodiments using the methods and technical contents disclosed above, without departing from the scope of the technical solution of the present application. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present application still fall within the scope of the technical solution of the present application.

Claims (6)

1. A method for obtaining friction work of an engine piston-connecting rod system, comprising:
acquiring piston friction parameter information, piston ring friction parameter information and connecting rod friction parameter information;
according to the piston friction parameter information, a piston friction calculation model is utilized to obtain piston friction work; according to the friction parameter information of the piston ring, a friction calculation model of the piston ring is utilized to obtain friction work of the piston ring; according to the connecting rod friction parameter information, a connecting rod friction calculation model is utilized to obtain connecting rod friction work;
acquiring friction work of a piston connecting rod system of the engine according to the piston friction work, the piston ring friction work and the connecting rod friction work;
wherein, the piston friction parameter information includes: viscosity of engine oil, average speed of piston and cylinder diameter;
the piston friction calculation model specifically comprises the following components:
in which W is 1 Friction work for the piston; a is the friction influence coefficient of the piston; mu is the viscosity of engine oil; mu (mu) 0 Is the standard value of the viscosity of engine oil; s is S p Is the average velocity of the piston; b is the cylinder diameter;
the friction parameter information of the piston ring comprises: the piston ring elasticity, piston skirt roughness, engine speed, the cylinder diameter, the engine oil viscosity, the compression ratio and the average piston speed, and the piston ring friction calculation model specifically comprises the following components:
In which W is 2 Friction work for piston rings; b is a first friction influence coefficient of the piston ring; f (F) t The elastic force of the piston ring is adopted; f (F) 0 Is the standard value of the elasticity of the piston ring; c (C) r Is piston skirt roughness; c (C) r0 Is a standard value of the roughness of the skirt part of the piston; n is the engine speed; b is the cylinder diameter; c is a second friction influence coefficient of the piston ring; mu is the viscosity of engine oil; mu (mu) 0 Is the standard value of the viscosity of engine oil; r is (r) c Is the compression ratio; d is a third friction influence coefficient of the piston ring; k is a roughness constant; s is S p Is the average velocity of the piston;
the connecting rod friction parameter information comprises: the engine oil viscosity, the engine rotating speed, the main bearing journal, the main bearing length, the number of main bearings, the cylinder diameter, the stroke and the number of cylinders, and the connecting rod friction calculation model specifically comprises:
in which W is 3 Friction work is performed on the connecting rod; e is the friction influence coefficient of the connecting rod; mu is the viscosity of engine oil; n is engineA rotational speed; d (D) b Is a main bearing journal; l (L) b The length of the main bearing; n is n b The number of the main bearings is the number of the main bearings; b is the cylinder diameter; s is the stroke; n (N) c The number of cylinders.
2. The method of claim 1, wherein when a piston friction calculation model includes the piston friction influence coefficient a, the piston ring friction calculation model includes the piston ring first friction influence coefficient b, the piston ring second friction influence coefficient c, and the piston ring third friction influence coefficient d, the connecting rod friction calculation model includes the connecting rod friction influence coefficient e, further comprising:
Acquiring a training set according to test data of an engine friction decomposition test;
and training the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model by utilizing the training set to obtain a piston friction influence coefficient a, a piston ring first friction influence coefficient b, a piston ring second friction influence coefficient c, a piston ring third friction influence coefficient d and a connecting rod friction influence coefficient e.
3. The method according to claim 2, wherein the training set is used to train the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model to obtain the piston friction influence coefficient a, the piston ring first friction influence coefficient b, the piston ring second friction influence coefficient c, the piston ring third friction influence coefficient d and the connecting rod friction influence coefficient e, specifically:
inputting the data in the training set into the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model to obtain a piston friction influence coefficient set, a piston ring first friction influence coefficient set, a piston ring second friction influence coefficient set, a piston ring third friction influence coefficient set and a connecting rod friction influence coefficient set;
And obtaining the piston friction influence coefficient a, the piston ring first friction influence coefficient b, the piston ring second friction influence coefficient c, the piston ring third friction influence coefficient d and the connecting rod friction influence coefficient e by curve fitting and curve regression according to the piston friction influence coefficient set, the piston ring first friction influence coefficient set, the piston ring second friction influence coefficient set, the piston ring third friction influence coefficient set and the connecting rod friction influence coefficient set.
4. An apparatus for obtaining friction work of an engine piston connecting rod system, comprising:
the first acquisition unit is used for acquiring piston friction parameter information, piston ring friction parameter information and connecting rod friction parameter information;
the second acquisition unit is used for acquiring piston friction work by using a piston friction calculation model according to the piston friction parameter information; according to the friction parameter information of the piston ring, a friction calculation model of the piston ring is utilized to obtain friction work of the piston ring; according to the connecting rod friction parameter information, a connecting rod friction calculation model is utilized to obtain connecting rod friction work;
the third acquisition unit is used for acquiring the friction work of the piston connecting rod system of the engine according to the piston friction work, the piston ring friction work and the connecting rod friction work;
Wherein, the piston friction parameter information includes: viscosity of engine oil, average speed of piston and cylinder diameter;
the piston friction calculation model specifically comprises the following components:
in which W is 1 Friction work for the piston; a is the friction influence coefficient of the piston; mu is the viscosity of engine oil; mu (mu) 0 Is the standard value of the viscosity of engine oil; s is S p Is the average velocity of the piston; b is the cylinder diameter;
the friction parameter information of the piston ring comprises: the piston ring elasticity, piston skirt roughness, engine speed, the cylinder diameter, the engine oil viscosity, the compression ratio and the average piston speed, and the piston ring friction calculation model specifically comprises the following components:
in which W is 2 Friction work for piston rings; b is a first friction influence coefficient of the piston ring; f (F) t The elastic force of the piston ring is adopted; f (F) 0 Is the standard value of the elasticity of the piston ring; c (C) r Is piston skirt roughness; c (C) r0 Is a standard value of the roughness of the skirt part of the piston; n is the engine speed; b is the cylinder diameter; c is a second friction influence coefficient of the piston ring; mu is the viscosity of engine oil; mu (mu) 0 Is the standard value of the viscosity of engine oil; r is (r) c Is the compression ratio; d is a third friction influence coefficient of the piston ring; k is a roughness constant; s is S p Is the average velocity of the piston;
the connecting rod friction parameter information comprises: the engine oil viscosity, the engine rotating speed, the main bearing journal, the main bearing length, the number of main bearings, the cylinder diameter, the stroke and the number of cylinders, and the connecting rod friction calculation model specifically comprises:
In which W is 3 Friction work is performed on the connecting rod; e is the friction influence coefficient of the connecting rod; mu is the viscosity of engine oil; n is the engine speed; d (D) b Is a main bearing journal; l (L) b The length of the main bearing; n is n b The number of the main bearings is the number of the main bearings; b is the cylinder diameter; s is the stroke; n (N) c The number of cylinders.
5. The apparatus of claim 4, wherein when a piston friction calculation model includes the piston friction influence coefficient a, the piston ring friction calculation model includes the piston ring first friction influence coefficient b, the piston ring second friction influence coefficient c, and the piston ring third friction influence coefficient d, the connecting rod friction calculation model includes the connecting rod friction influence coefficient e, further comprising:
the fourth acquisition unit is used for acquiring a training set according to test data of an engine friction decomposition test;
and the fifth acquisition unit is used for training the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model by utilizing the training set to obtain the piston friction influence coefficient a, the piston ring first friction influence coefficient b, the piston ring second friction influence coefficient c, the piston ring third friction influence coefficient d and the connecting rod friction influence coefficient e.
6. The apparatus according to claim 5, wherein the fifth acquisition unit is specifically:
the first acquisition subunit is used for inputting the data in the training set into the piston friction calculation model, the piston ring friction calculation model and the connecting rod friction calculation model to obtain a piston friction influence coefficient set, a piston ring first friction influence coefficient set, a piston ring second friction influence coefficient set, a piston ring third friction influence coefficient set and a connecting rod friction influence coefficient set;
and the second obtaining subunit is used for obtaining the piston friction influence coefficient a, the piston ring first friction influence coefficient b, the piston ring second friction influence coefficient c, the piston ring third friction influence coefficient d and the connecting rod friction influence coefficient e by utilizing curve fitting and curve regression according to the piston friction influence coefficient set, the piston ring first friction influence coefficient set, the piston ring second friction influence coefficient set, the piston ring third friction influence coefficient set and the connecting rod friction influence coefficient set.
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