CN117871105A - Test device and test method for engine lubrication system of automobile - Google Patents

Abstract

The disclosure provides a test device and a test method for an engine lubrication system of an automobile, and belongs to the technical field of engine lubrication systems. The test device comprises a detection assembly and a plugging assembly, wherein the plugging assembly is detachably connected with the cylinder body oil duct and the cylinder cover oil duct respectively; the detection assembly comprises at least one cylinder body pressure detector, at least one cylinder cover pressure detector and a flowmeter, wherein the at least one cylinder body pressure detector is connected to the cylinder body connecting oil duct and/or the cylinder body branch oil duct, the at least one cylinder cover pressure detector is connected to the cylinder cover connecting oil duct and/or the cylinder cover branch oil duct, and the flowmeter is connected to the main oil duct. The present disclosure may detect the flow of different oil galleries in a lubrication system.

Description

Test device and test method for engine lubrication system of automobile

Technical Field

The disclosure belongs to the technical field of engine lubrication systems, and particularly relates to a test device and a test method of an engine lubrication system of an automobile.

Background

Nowadays, in the automotive industry, low fuel consumption is becoming a major research direction in automobile research and development. In the lubrication system of an engine, how to make the lubrication system provide the engine oil with a proper flow rate and a proper pressure is a main research content of the lubrication system. The actual oil consumption of the engine is mostly explored through a lubrication test. The so-called lubrication test is to feed engine oil into each oil passage (including a main oil passage, a branch oil passage leading to a cylinder block and a cylinder head, etc.) of a lubrication system by an engine oil pump in advance, and detect the flow rate and pressure of the engine oil at the same time.

In the related art, one end of a main oil duct is connected with an outlet of an engine oil pump, and the other end of the main oil duct is connected with each branch oil duct in a cylinder body and a cylinder cover. In the lubrication test, a flowmeter is typically connected to the main oil gallery, and a corresponding pressure gauge is connected to each branch oil gallery. By controlling the oil pump, the oil is pumped into the main oil passage and each branch oil passage. In the pumping process of the engine oil, the flow rate of the main oil passage is detected through a flowmeter, and the corresponding engine oil pressure is detected through each pressure gauge.

However, the flow meter is limited to a relatively large volume (typically 100X100 mm), and the flow meter can only be disposed outside the total oil passage (the inner diameter of the total oil passage is typically within 10 mm). Moreover, because the main oil passage is outside the cylinder body and the cylinder cover, and other branch oil passages are generally in the cylinder body or the cylinder cover, the flowmeter cannot be accommodated. Therefore, the flowmeter can only be arranged on the outer side of the main oil duct, and accordingly, the oil flow of the whole engine can only be detected, but the oil flow of specific parts cannot be detected, so that the accuracy of a test result is low.

Disclosure of Invention

The embodiment of the disclosure provides a test device and a test method for an engine lubricating system of an automobile, which can detect oil quantity, pressure and the like in different oil ducts in the lubricating system. The technical scheme is as follows:

The embodiment of the disclosure provides a test device of an engine lubricating system of an automobile, the engine lubricating system comprises a main oil duct, a cylinder body oil duct, a cylinder cover oil duct and an engine oil pump, wherein a first end of the main oil duct is communicated with an outlet of the engine oil pump, the cylinder body oil duct comprises a cylinder body connecting oil duct and a plurality of cylinder body branch oil ducts, one end of the cylinder body connecting oil duct is communicated with a second end of the main oil duct, the other end of the cylinder body connecting oil duct is communicated with the plurality of cylinder body branch oil ducts, the plurality of cylinder body branch oil ducts are used for supplying oil to different parts to be lubricated in the cylinder body, the cylinder cover oil duct comprises a cylinder cover connecting oil duct and a plurality of cylinder cover branch oil ducts, one end of the cylinder cover connecting oil duct is communicated with the second end of the main oil duct, and the other end of the cylinder cover connecting oil duct is communicated with the plurality of cylinder cover branch oil ducts, and the plurality of cylinder cover branch oil ducts are used for supplying oil to different parts to be lubricated in the cylinder cover; the test device comprises a detection assembly and a plugging assembly, wherein the plugging assembly is detachably connected with the cylinder body oil duct and the cylinder cover oil duct respectively; the detection assembly comprises at least one cylinder body pressure detector, at least one cylinder cover pressure detector and a flowmeter, wherein the at least one cylinder body pressure detector is connected in the cylinder body connecting oil duct and/or the cylinder body branch oil duct, the cylinder body pressure detector is used for measuring the pressure in a correspondingly connected oil duct under the condition that the cylinder body oil duct and the cylinder cover oil duct are not plugged, the at least one cylinder cover pressure detector is connected in the cylinder cover connecting oil duct and/or the cylinder cover branch oil duct, and the cylinder cover pressure detector is used for measuring the pressure in the correspondingly connected oil duct under the condition that the cylinder body oil duct and the cylinder cover oil duct are not plugged; the flowmeter is connected to the main oil duct, and is used for detecting the flow of the main oil duct under the condition that the cylinder body oil duct and the cylinder cover oil duct are not plugged, and detecting at least one of first flow or second flow, wherein the first flow is the flow of the main oil duct when the cylinder body is connected with the oil duct and the pressure detected by the cylinder cover pressure detector is the pressure corresponding to the condition that the cylinder body oil duct and the cylinder cover oil duct are not plugged, and the second flow is the flow of the main oil duct when the cylinder cover is connected with the oil duct and the pressure detected by the cylinder body pressure detector is the pressure corresponding to the condition that the cylinder body oil duct and the cylinder cover oil duct are not plugged.

In yet another implementation of the disclosure, the plugging assembly includes two first plugs, one of the two first plugs is detachably connected with the cylinder block connecting oil duct, and the other of the two first plugs is detachably connected with the cylinder head connecting oil duct; the at least one cylinder body pressure detector comprises a first pressure gauge which is connected to the oil inlet end of the cylinder body connecting oil duct and used for detecting the pressure P1 of the cylinder body connecting oil duct when the cylinder body oil duct and the cylinder cover oil duct are not plugged, and the at least one cylinder cover pressure detector comprises a second pressure gauge which is connected to the oil inlet end of the cylinder cover connecting oil duct and used for detecting the pressure P2 of the cylinder cover connecting oil duct when the cylinder body oil duct and the cylinder cover oil duct are not plugged; the flowmeter is used for detecting the flow V0 of the corresponding total oil passage under the condition that the cylinder body oil passage and the cylinder cover oil passage are not blocked, and the pressure of the cylinder body oil passage is P1 and the pressure of the cylinder cover oil passage is P2; the flowmeter is further used for detecting the flow V1 of the total oil duct under the condition that the oil inlet end of the cylinder cover connecting oil duct is plugged, and the pressure of the cylinder body connecting oil duct is P1, or detecting the flow V2 of the total oil duct under the condition that the oil inlet end of the cylinder body connecting oil duct is plugged, and the pressure of the cylinder cover connecting oil duct is P2.

In yet another implementation of the present disclosure, the plurality of cylinder branch oil passages include a crank oil passage, a plurality of cooling nozzle oil passages, and a plurality of crank bearing oil passages, a middle portion of the crank oil passage is communicated with the second end of the cylinder connecting oil passage, an extending direction of the crank oil passage is the same as an axis direction of a crankshaft of the engine, the plurality of cooling nozzle oil passages are arranged at intervals along the extending direction of the crank oil passage and are respectively communicated with the crank oil passage, and the plurality of crank bearing oil passages are arranged at intervals along the extending direction of the crank oil passage and are communicated with the crank oil passage; the plugging assembly further comprises a plurality of second plugs, the second plugs are arranged in one-to-one correspondence with the cooling nozzle oil channels, and the second plugs are detachably connected in the corresponding cooling nozzle oil channels; the at least one cylinder pressure detector further comprises a third pressure gauge connected to one of the plurality of crank bearing oil passages for detecting an oil pressure P3 of the crank bearing oil passage in case that neither the cylinder oil passage nor the cylinder head oil passage is blocked; the flowmeter is also used for controlling the flow V3 of the total oil duct under the conditions that the cylinder cover connecting oil duct is blocked, the cooling nozzle oil duct is blocked and the oil pressure of the crankshaft bearing oil duct is P3.

In still another implementation of the present disclosure, the plurality of cylinder head branch oil passages include a variable valve timing oil passage, two camshaft oil passages, a plurality of camshaft diameter oil passages, and a plurality of hydraulic tappet oil passages, the variable valve timing oil passage is communicated with a second end of the cylinder head connecting oil passage and is respectively communicated with the two camshaft oil passages, the plurality of camshaft diameter oil passages are divided into two groups of camshaft diameter oil passages, the two groups of camshaft diameter oil passages are in one-to-one correspondence with the two camshaft oil passages, each group includes a plurality of camshaft diameter oil passages, a plurality of camshaft diameter oil passages of each group are respectively arranged on the corresponding camshaft oil passages at intervals along an extending direction of the camshaft oil passages and are respectively communicated with the corresponding camshaft oil passages, the plurality of hydraulic tappet oil passages are also divided into two groups, the two groups of hydraulic tappet oil passages are respectively communicated with the two camshaft oil passages along the extending direction of the camshaft oil passages, and each group of the plurality of camshaft oil passages is respectively arranged on the corresponding camshaft oil passages at intervals along the extending direction of the camshaft oil passages; the plugging assembly further comprises two third plugs, the two third plugs are arranged in one-to-one correspondence with the two camshaft oil channels, and the third plugs are detachably connected to the corresponding connecting positions of the camshaft oil channels and the variable valve timing oil channels; the at least one cylinder head pressure detector further comprises a fourth pressure gauge, wherein the fourth pressure gauge is connected to the variable valve timing oil duct and is used for detecting the oil pressure P4 of the variable valve timing oil duct under the condition that the plugging assembly is not plugged in both the cylinder body oil duct and the cylinder head oil duct; the flowmeter is further used for detecting the flow V4 of the corresponding total oil duct when the oil pressure of the variable valve timing oil duct is P4 after the cylinder body connecting oil duct is blocked and the camshaft oil duct is blocked.

In yet another implementation of the disclosure, the plugging assembly further includes a plurality of fourth plugs arranged in one-to-one correspondence with the plurality of hydraulic tappet oil channels, the fourth plugs being detachably connected at the corresponding hydraulic tappet oil channels; the at least one cylinder cover pressure detector further comprises a fifth pressure gauge, wherein the fifth pressure gauge is connected to one of the camshaft diameter oil passages and is used for detecting the oil pressure P5 of the camshaft diameter oil passage under the condition that the cylinder body oil passage and the cylinder cover oil passage are not blocked; the flowmeter is further used for detecting the flow V5 of the corresponding total oil duct when the oil pressure of the camshaft shaft diameter oil duct is P5 after the cylinder body connecting oil duct is plugged and the hydraulic tappet oil duct is plugged.

In another aspect, an embodiment of the present disclosure further provides a test method of an engine lubrication system of an automobile, the test method including: under the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked, oil is supplied to the engine lubricating system through an oil pump, the flow of the total oil duct is detected through the flowmeter, and the pressure in the oil duct correspondingly connected with the cylinder body pressure detector and the cylinder cover pressure detector is measured; and obtaining a first flow or a second flow through the flowmeter, wherein the first flow is the flow of the total oil duct when the cylinder body is connected with the oil duct for blocking, and at least one cylinder cover pressure detector detects the pressure which corresponds to the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked, and the second flow is the flow of the total oil duct when the cylinder cover is connected with the oil duct for blocking, and at least one cylinder body pressure detector detects the pressure which corresponds to the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked.

In yet another implementation of the present disclosure, the obtaining, by the flow meter, the first flow rate or the second flow rate includes: connecting the plugging assembly to the oil inlet end of the cylinder cover connecting oil duct to plug the cylinder cover connecting oil duct; the oil pump is regulated, so that the detection value of the first pressure gauge is the corresponding pressure P1 under the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked; detecting the flow V1 of the total oil duct through a flowmeter to obtain the first flow; and/or connecting the plugging assembly to the oil inlet end of the cylinder connecting oil duct to plug the cylinder connecting oil duct; the oil pump is regulated, so that the detection value of the second pressure gauge is the corresponding pressure P2 under the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked; and detecting the flow V2 of the total oil duct through a flowmeter to obtain the second flow.

In yet another implementation of the present disclosure, the test method further includes: the plugging assembly is connected to the oil inlet end of the cylinder cover connecting oil duct and is simultaneously connected to the cooling nozzle oil duct to plug the cylinder cover connecting oil duct and the cooling nozzle oil duct; the oil pump is regulated, so that the detection value of the third pressure gauge is the corresponding pressure P3 under the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked; and detecting the flow V3 of the total oil duct through a flowmeter.

In yet another implementation of the present disclosure, the test method further includes: the plugging assembly is connected to the oil inlet end of the cylinder body connecting oil duct and is connected between a camshaft oil duct and a variable valve timing oil duct so as to plug the cylinder body connecting oil duct and the camshaft oil duct; the oil pump is regulated, so that the detection value of the fourth pressure gauge is the corresponding pressure P4 under the condition that the cylinder body connecting oil duct and the cylinder cover oil duct are not blocked; and detecting the flow V4 of the total oil duct through a flowmeter.

In yet another implementation of the present disclosure, the test method further includes: the plugging assembly is connected to the oil inlet end of the cylinder connecting oil duct and is connected to the hydraulic tappet oil duct so as to plug the cylinder connecting oil duct and the hydraulic tappet oil duct; the oil pump is regulated so that the pressure of a camshaft shaft diameter oil passage is the corresponding pressure P5 under the condition that the cylinder body oil passage and the cylinder cover oil passage are not blocked; and detecting the flow V5 of the total oil duct through a flowmeter.

The technical scheme provided by the embodiment of the disclosure has the beneficial effects that:

when the engine lubricating system of the automobile is tested through the test device provided by the implementation of the disclosure, the test device comprises the detection component and the plugging component, and the plugging component is detachably connected with the cylinder body oil duct and the cylinder cover oil duct respectively, so that different positions of the cylinder body oil duct or the cylinder cover oil duct can be plugged through the plugging component. And because the detection component comprises at least one cylinder body pressure detector, at least one cylinder cover pressure detector and a flowmeter, the oil pressure at the joint with the oil duct can be correspondingly detected through the cylinder body pressure detector and the cylinder cover pressure detector, and the total engine oil flow pumped by the oil pump at the time of unblocking can be detected through the flowmeter. Meanwhile, the flow meter is also used for detecting at least one of the first flow and the second flow, so that the first flow or the second flow can be obtained through the flow meter, and the oil flows of the oil pump, which respectively enter the cylinder cover oil duct and the cylinder body oil duct, are obtained when the oil pump pumps oil normally, and the flows of different oil ducts are obtained.

That is, the above test device can plug different positions in the cylinder body oil duct and the cylinder cover oil duct 300 through the plugging assembly, and simultaneously, the flow of the engine oil in the unblocked oil duct can be correspondingly detected through the flowmeter 13, so that the flow in different oil ducts and the oil consumption of corresponding parts to be lubricated of different oil duct flows are clarified, the oil duct design of the lubrication system is optimized, and meanwhile, the output pressure of the engine oil pump, the flow of the engine oil, the displacement of the engine oil pump and the like can be also guided in reverse.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a block diagram of an engine lubrication system provided by an embodiment of the present disclosure;

FIG. 2 is a schematic view of the right portion of FIG. 1;

FIG. 3 is a schematic view of the left portion of FIG. 1;

fig. 4 is a test method of an engine lubrication system of an automobile provided in an embodiment of the present disclosure.

The symbols in the drawings are as follows:

100. a total oil passage; 200. a cylinder oil passage; 201. the cylinder body is connected with the oil duct; 202. a crank oil passage; 203. a cooling nozzle oil passage; 204. crank shaft bearing oil duct;

300. the cylinder cover oil duct; 301. the cylinder cover is connected with the oil duct; 302. a variable valve timing oil passage; 303. a camshaft oil passage; 304. a camshaft shaft diameter oil passage; 305. an oil passage of the hydraulic tappet; 400. an oil pump;

11. a cylinder pressure detector; 111. a first pressure gauge; 113. a third pressure gauge; 12. a cylinder head pressure detector; 122. a second pressure gauge; 124. a fourth pressure gauge; 125. a fifth pressure gauge; 13. a flow meter; 21. a first plug; 22. a second plug; 23. a third plug; 24. and a fourth plug.

Detailed Description

For the purposes of clarity, technical solutions and advantages of the present disclosure, the following further details the embodiments of the present disclosure with reference to the accompanying drawings.

The embodiment of the disclosure provides a test device for an engine lubricating system of an automobile. As shown in fig. 1, the engine lubrication system includes a main oil duct 100, a cylinder body oil duct 200, a cylinder head oil duct 300 and an oil pump 400, wherein a first end of the main oil duct 100 is communicated with an outlet of the oil pump 400, the cylinder body oil duct 200 includes a cylinder body connecting oil duct 201 and a plurality of cylinder body branch oil ducts, one end of the cylinder body connecting oil duct 201 is communicated with a second end of the main oil duct 100, the other end of the cylinder body connecting oil duct 201 is communicated with a plurality of cylinder body branch oil ducts, the plurality of cylinder body branch oil ducts are used for supplying oil to different parts to be lubricated in the cylinder body, the cylinder head oil duct 300 includes a cylinder head connecting oil duct 301 and a plurality of cylinder head branch oil ducts, one end of the cylinder head connecting oil duct 301 is communicated with the second end of the main oil duct 100, the other end of the cylinder head connecting oil duct 301 is communicated with a plurality of cylinder head branch oil ducts, and the plurality of cylinder head branch oil ducts are used for supplying oil to different parts to be lubricated in the cylinder head.

The test device comprises a detection assembly and a plugging assembly, wherein the plugging assembly is detachably connected with the cylinder body oil duct 200 and the cylinder cover oil duct 300 respectively. The detection assembly comprises at least one cylinder pressure detector 11, at least one cylinder head pressure detector 12 and a flow meter 13, wherein the at least one cylinder pressure detector 11 is connected in the cylinder connecting oil duct 201 and/or the cylinder branch oil duct, the cylinder pressure detector 11 is used for measuring the pressure in the corresponding connected oil duct under the condition that the cylinder oil duct 200 and the cylinder head oil duct 300 are not plugged, the at least one cylinder head pressure detector 12 is connected in the cylinder head connecting oil duct 301 and/or the cylinder head branch oil duct, and the cylinder head pressure detector 12 is used for measuring the pressure in the corresponding connected oil duct under the condition that the cylinder body oil duct 200 and the cylinder head oil duct 300 are not plugged.

The flow meter 13 is connected to the total oil passage 100, and is configured to detect a flow rate of the total oil passage 100 in a case where neither the cylinder block oil passage 200 nor the head oil passage 300 is blocked, and detect at least one of a first flow rate or a second flow rate, wherein the first flow rate is a flow rate of the total oil passage 100 when the cylinder block connecting oil passage 201 is blocked and the pressure detected by the at least one head pressure detector 12 is a pressure corresponding to a case where neither the cylinder block oil passage 200 nor the head oil passage 300 is blocked, and the second flow rate is a flow rate of the total oil passage 100 when the cylinder block connecting oil passage 301 is blocked and the pressure detected by the at least one cylinder pressure detector 11 is a pressure corresponding to a case where neither the cylinder block oil passage 200 nor the head oil passage 300 is blocked.

When the engine lubricating system of the automobile is tested through the test device provided by the implementation of the disclosure, the test device comprises the detection component and the plugging component, and the plugging component is detachably connected with the cylinder body oil duct 200 and the cylinder cover oil duct 300 respectively, so that different positions of the cylinder body oil duct 200 or the cylinder cover oil duct 300 can be plugged through the plugging component. Moreover, since the detection assembly comprises at least one cylinder pressure detector 11, at least one cylinder head pressure detector 12 and a flow meter 13, the oil pressure at the connection part with the oil passage can be correspondingly detected through the cylinder pressure detector 11 and the cylinder head pressure detector 12, and the total engine oil flow pumped by the oil pump 400 at the time of unblocking can be detected through the flow meter 13. Meanwhile, the flow meter 13 is further used for detecting at least one of the first flow and the second flow, so that the first flow or the second flow can be obtained through the flow meter 13, and further, the oil flows of the oil pump respectively entering the cylinder cover oil duct 300 and the cylinder body oil duct 200 during normal oil pumping of the oil pump can be obtained, and therefore, the flows of different oil ducts can be obtained.

That is, the above test device can plug different positions in the cylinder body oil duct 200 and the cylinder cover oil duct 300 through the plugging assembly, and simultaneously, the flow of the engine oil in the unblocked oil duct can be correspondingly detected through the flowmeter 13, so that the flow in different oil ducts and the oil consumption of different oil duct flows to corresponding parts to be lubricated can be further clarified, the oil duct design of the lubrication system is optimized, and meanwhile, the output pressure of the engine oil pump, the engine oil flow, the discharge capacity of the engine oil pump and the like can be also guided in reverse.

Referring to fig. 2 and 3, alternatively, the plugging assembly includes two first plugs 21, one of the two first plugs 21 is detachably connected to the cylinder block connecting oil passage 201, and the other of the two first plugs 21 is detachably connected to the cylinder head connecting oil passage 301.

The at least one cylinder pressure detecting gauge 11 includes a first pressure gauge 111, the first pressure gauge 111 is connected at an oil inlet end of the cylinder connecting oil passage 201 for detecting a pressure P1 of the cylinder connecting oil passage 201 when neither the cylinder oil passage 200 nor the cylinder head oil passage 300 is blocked, and the at least one cylinder pressure detecting gauge 12 includes a second pressure gauge 122, the second pressure gauge 122 is connected at an oil inlet end of the cylinder connecting oil passage 301 for detecting a pressure P2 of the cylinder connecting oil passage 301 when neither the cylinder oil passage 200 nor the cylinder head oil passage 300 is blocked.

The flow meter 13 is configured to detect the flow rate V0 of the corresponding total oil passage 100 in the case where neither the cylinder block oil passage 200 nor the head oil passage 300 is blocked, and the pressure of the cylinder block oil passage 200 is P1 and the pressure of the head oil passage 300 is P2. The flow meter 13 is further used for detecting the flow V1 of the total oil passage 100 in the case where the oil inlet end of the cylinder head connecting oil passage 301 is blocked and the pressure of the cylinder block connecting oil passage 201 is P1, or the flow meter 13 is used for detecting the flow V2 of the total oil passage 100 in the case where the oil inlet end of the cylinder block connecting oil passage 201 is blocked and the pressure of the cylinder head connecting oil passage 301 is P2.

In the above implementation manner, the two first plugs 21 may be detachably connected to the oil inlet end of the cylinder block connecting oil duct 201 and the oil inlet end of the cylinder head connecting oil duct 301, so that the oil inlet end of the cylinder block connecting oil duct 201 and the oil inlet end of the cylinder head connecting oil duct 301 may be plugged.

If the first plug 21 is connected to the oil inlet end of the cylinder connecting oil passage 201, the first plug 21 can plug the whole cylinder oil passage 200, and the engine oil pumped by the engine oil pump 400 can only flow to the cylinder head oil passage 300 through the main oil passage 100, so that the engine oil flow of the parts (such as a camshaft) to be lubricated in the cylinder head oil passage 300 can be detected to provide convenience. In contrast, if the first plug 21 is connected to the oil inlet end of the cylinder head connecting oil passage 301, the first plug 21 can plug the entire cylinder head oil passage 300, and the engine oil pumped by the engine oil pump 400 can only flow to the cylinder oil passage 200 through the main oil passage 100, so that the engine oil flow of the components (such as a crankshaft) to be lubricated in the cylinder oil passage 200 can be detected to provide convenience.

While the first pressure gauge 111 is used to detect the pressure in the cylinder block connecting oil passage 201 and the second pressure gauge 122 is used to detect the pressure in the cylinder head connecting oil passage 301.

The flow meter 13 is used to detect the flow rate of the total oil passage 100 in various situations. In the detection, the oil pressure and the oil flow rate of the engine are determined through early development experience, and the oil pump 400 is adjusted so that the pumped oil meets the above conditions. Then, the flow rate V0 of the engine oil in the total oil passage when neither the cylinder block oil passage 200 nor the head oil passage 300 is blocked is correspondingly detected by the flow meter 13, and the pressures of the cylinder block connecting oil passage 201 and the head connecting oil passage 301 are respectively detected as P1 and P2 by the first pressure gauge 111 and the second pressure gauge 122. Next, the first plug 21 is plugged at the oil inlet end of the cylinder connecting oil passage 201 (or the oil inlet end of the cylinder head connecting oil passage 301), the oil pump 400 is again adjusted so that the oil pressure entering the cylinder head connecting oil passage 301 is P2 (or the oil pressure entering the cylinder connecting oil passage 201 is P1), and the flow rate V2 (or V1) of the total oil passage 100 is detected by the flow meter 13. Therefore, the lower limit of the engine oil pressure and the engine oil flow in different oil duct branches in the engine can be correspondingly detected, the lubricating oil path design and the lubricating oil pump type selection of the engine can be optimized, and the lubricating system design of the newly developed subsequent engine project can be guided.

That is, the first plug 21 may be connected to the oil inlet end of the head connecting oil passage 301 to block the head oil passage 300. The oil pump 400 is then adjusted so that the detection value of the first pressure gauge 111 is the corresponding pressure P1 in the case where neither the cylinder block oil passage 200 nor the head oil passage 300 is blocked. The flow V1 of the total oil passage is then detected by the flow meter 13. Thus, when the lubrication system works normally, the flow of the total oil passage is V0, the flow of the cylinder body oil passage 200 is V1, and the flow of the cylinder cover oil passage 300 is V0-V1. Of course, the first plug 21 may be connected to the oil inlet end of the cylinder connecting oil passage 201 to block the cylinder oil passage 200. Then, the oil pump 400 is adjusted so that the detection value of the second pressure gauge 122 is the corresponding pressure P2 in the case where neither the cylinder block oil passage 200 nor the head oil passage 300 is blocked. And then the flow V2 of the total oil passage is detected by the flow meter 13. In this way, in the lubrication system, the flow rate of the total oil passage is V0, the flow rate of the head oil passage 300 is V2, and the flow rate of the cylinder block oil passage 200 is V0-V2.

Alternatively, in order to accurately obtain the flow rate, all the above operations may be performed, so that the flow rate of the total oil passage in the lubrication system is V0, the flow rate of the cylinder head oil passage 300 is calculated as V2, and the flow rate of the cylinder block oil passage 200 is V1.

Optionally, the plurality of cylinder branch oil passages include a crank oil passage 202, a plurality of cooling nozzle oil passages 203, and a plurality of crank bearing oil passages 204, wherein a middle portion of the crank oil passage 202 communicates with the second end of the cylinder connecting oil passage 201, an extending direction of the crank oil passage 202 is the same as an axial direction of a crankshaft of the engine, the plurality of cooling nozzle oil passages 203 are arranged at intervals along the extending direction of the crank oil passage 202 and communicate with the crank oil passage 202, and the plurality of crank bearing oil passages 204 are arranged at intervals along the extending direction of the crank oil passage 202 and communicate with the crank oil passage 202. The plugging assembly further comprises a plurality of second plugs 22, the plurality of second plugs 22 are arranged in one-to-one correspondence with the plurality of cooling nozzle oil passages 203, and the second plugs 22 are detachably connected in the corresponding cooling nozzle oil passages 203.

The at least one cylinder pressure detecting gauge 11 further includes a third pressure gauge 113, the third pressure gauge 113 being connected at one of the plurality of crank bearing oil passages 204 for detecting the oil pressure P3 of the crank bearing oil passage 204 in the case where neither the cylinder oil passage 200 nor the head oil passage 300 is blocked. The flow meter 13 is also used for the flow rate V3 of the total oil passage 100 in the case where the head-connecting oil passage 301 is blocked, the cooling nozzle oil passage 203 is blocked, and the oil pressure of the crank bearing oil passage 204 is P3.

In the above implementation manner, the second plug 22 is used for plugging the corresponding cooling nozzle oil passage 203, so that the flow rate and the pressure of the engine oil in different oil passage branches in the cylinder oil passage 200 can be further detected. And the third pressure gauge 113 is used to detect the oil pressure of the crank bearing oil passage 204.

For example, in the detection, to know the flow rate of the engine oil in the cooling nozzle oil passage 203, the first plug 21 may be plugged to the oil inlet end of the cylinder head connecting oil passage 301, and then the second plug 22 may be plugged to the corresponding cooling nozzle oil passage 203 sequentially. The oil pump 400 is then adjusted so that the oil pressure of the oil that has entered the crank bearing oil passage 204 becomes P3 (i.e., the detection value of the third pressure gauge 113 becomes P3), and finally the flow rate V3 of the total oil passage 100 is detected by the flow meter 13. This corresponds to the flow V3 in the crank bearing oil passage 204. Accordingly, the flow rate of the cooling nozzle oil passage 203 is V1 to V3.

Referring to fig. 3, alternatively, the plurality of cylinder head branch oil passages include a variable valve timing oil passage 302, two camshaft oil passages 303, a plurality of camshaft diameter oil passages 304, and a plurality of hydraulic tappet oil passages 305, the variable valve timing oil passage 302 communicates with the second end of the cylinder head connecting oil passage 301 and communicates with the two camshaft oil passages 303, respectively, the plurality of camshaft diameter oil passages 304 are divided into two groups of camshaft diameter oil passages 304, the two groups of camshaft diameter oil passages 304 are in one-to-one correspondence with the two camshaft oil passages 303, each group includes a plurality of camshaft diameter oil passages 304, the plurality of camshaft diameter oil passages 304 of each group are respectively arranged on the corresponding camshaft oil passage 303 at intervals along the extending direction of the camshaft oil passage 303 and communicate with the corresponding camshaft oil passage 303, the plurality of hydraulic tappet oil passages 305 are also divided into two groups, the two groups of hydraulic tappet oil passages 305 are respectively in one-to-one correspondence with the two camshaft oil passages 303, the plurality of hydraulic tappet oil passages 305 of each group are respectively arranged on the corresponding camshaft oil passages 303 at intervals along the extending direction of the camshaft oil passage 303, and communicate with the corresponding camshaft oil passage 303.

The plugging assembly further comprises two third plugs 23, the two third plugs 23 are arranged in one-to-one correspondence with the two camshaft oil channels 303, and the third plugs 23 are detachably connected to the connecting positions of the corresponding camshaft oil channels 303 and the variable valve timing oil channels 302. The at least one head pressure detector 12 further includes a fourth pressure gauge 124, the fourth pressure gauge 124 being connected at the variable valve timing oil passage 302 for detecting an oil pressure P4 of the variable valve timing oil passage 302 in a case where the plugging assembly is not plugged in both the cylinder block oil passage 200 and the head oil passage 300. The flow meter 13 is further configured to detect the flow V4 of the corresponding total oil passage 100 when the cylinder connecting oil passage 201 is blocked, the camshaft oil passage 303 is blocked, and the oil pressure of the variable valve timing oil passage 302 is P4.

In the above implementation manner, the third plug 23 is configured to plug the corresponding camshaft oil passage 303, so that the oil flow and the pressure of different oil passage branches in the cylinder head oil passage 300 can be further detected. And fourth pressure gauge 124 is for detecting the oil pressure of variable valve timing oil passage 302.

For example, in the detection, to know the oil flow in the variable valve timing oil passage 302, the first plug 21 may be plugged to the oil inlet end of the cylinder connecting oil passage 201, and then the third plug 23 may be plugged to the corresponding camshaft oil passage 303 sequentially. Next, the oil pump 400 is adjusted so that the oil pressure of the engine oil that has entered the variable valve timing oil passage 302 becomes P4, that is, the detection value of the fourth pressure gauge 124 becomes P4, and finally the flow rate V4 of the total oil passage 100 is detected by the flow meter 13. This corresponds to the flow rate V4 in the variable valve timing oil passage 302. Accordingly, the flow rate of the camshaft oil passage 303 is V2 to V4.

Optionally, the plugging assembly 2 further includes a plurality of fourth plugs 24, where the plurality of fourth plugs 24 are disposed in one-to-one correspondence with the plurality of hydraulic tappet oil channels 305, and the fourth plugs 24 are detachably connected at the corresponding hydraulic tappet oil channels 305. The at least one head pressure sensor 12 further includes a fifth pressure sensor 125, where the fifth pressure sensor 125 is connected to one of the plurality of camshaft diameter oil passages 304 for detecting the oil pressure P5 of the camshaft diameter oil passage 304 when neither the cylinder block oil passage 200 nor the head oil passage 300 is blocked.

The flow meter 13 is further configured to detect a flow V5 of the corresponding total oil passage 100 when the oil pressure of the camshaft diameter oil passage 304 is P5 after the cylinder connecting oil passage 201 is blocked and the hydraulic tappet oil passage 305 is blocked.

In the above implementation manner, the fourth plug 24 is configured to plug the corresponding hydraulic tappet oil passage 305, so that the oil flow and the pressure of different oil passage branches in the cylinder head oil passage 300 can be further detected. And the fifth pressure gauge 125 is used to detect the oil pressure of the camshaft diameter oil passage 304.

For example, in the detection, to know the flow rate of the engine oil in the hydraulic tappet oil passage 305, the first plug 21 may be plugged to the oil inlet end of the cylinder connecting oil passage 201, and then the fourth plug 24 may be plugged to the corresponding hydraulic tappet oil passage 305 sequentially. The oil pump 400 is then adjusted so that the oil pressure of the oil that has entered the camshaft diameter oil passage 304 becomes P5 (i.e., the detection value of the fifth pressure gauge 125 becomes P5), and finally the flow rate V5 of the total oil passage 100 is detected by the flow meter 13. Thus, the oil flow in hydraulic lifter gallery 305 is correspondingly V2-V5. Accordingly, the camshaft diameter oil passage 304 has a flow rate of V5-V4.

Of course, the above test device is not limited to the above structure, and a corresponding pressure detector or plug can be added again, and the arrangement of the plug and the pressure detector is specifically distributed completely according to the distribution of the oil duct in the lubrication system.

In the embodiment of the disclosure, the plug may be a plug, and is directly detachably connected with the corresponding oil duct through threads and the like.

In another aspect, the disclosure further provides a test method of an engine lubrication system of an automobile, as shown in fig. 4, where the test method includes:

s401: under the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked, oil is supplied to an engine lubricating system through an oil pump, the flow of the total oil duct is detected through a flowmeter, and the pressure in the oil duct correspondingly connected with the cylinder body pressure detector and the cylinder cover pressure detector is measured.

S402: at least one of the first flow rate and the second flow rate is obtained by a flow meter.

The first flow is the flow of the total oil duct when the oil duct is blocked in the cylinder body connection, and the pressure detected by at least one cylinder cover pressure detector is the pressure corresponding to the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked, and the second flow is the flow of the total oil duct when the oil duct is blocked in the cylinder cover connection, and the pressure detected by at least one cylinder body pressure detector is the pressure corresponding to the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked.

The above test method has the same beneficial effects as the foregoing test device, and will not be described here again.

Optionally, step S402 may include:

if the cylinder block oil passage is subjected to flow detection, the step (1) is performed, and if the cylinder head oil passage is subjected to flow detection, the step (2) is performed. If flow detection is performed for a different branch oil passage within the cylinder block oil passage, then (3) is performed.

If flow detection is performed for different branch oil passages in the head oil passage, either (4) or (5) is performed.

Wherein step (1) comprises:

1.1: and connecting a first plug in the plugging assembly to the oil inlet end of the cylinder cover connecting oil duct so as to plug the cylinder cover oil duct.

1.2: the oil pump is regulated so that the detection value of the first pressure gauge is the corresponding pressure P1 under the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked;

1.3 flow V1 of the total oil gallery is detected by a flow meter.

Wherein, step (2) includes:

2.1: and connecting a first plug in the plugging assembly to the oil inlet end of the cylinder body connecting oil duct so as to plug the cylinder body oil duct.

2.2: the oil pump is regulated, so that the detection value of the second pressure gauge is the corresponding pressure P2 under the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked;

2.3: the flow V2 of the total oil passage is detected by a flow meter.

According to the foregoing, if it is necessary to further detect the flow rate of the different branch oil passages in the cylinder oil passage, the step (3) is continued after the step (1).

Wherein, step (3) includes:

3.1: and connecting a first plug in the plugging assembly to the oil inlet end of the cylinder cover connecting oil duct to plug the cylinder cover oil duct, and connecting a second plug in the cooling nozzle oil duct to plug the cooling nozzle oil duct.

3.2: and adjusting the oil pump so that the detection value of the third pressure gauge is the corresponding pressure P3 under the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked.

3.3: the flow V3 of the total oil passage is detected by a flow meter.

Thus, the flow in the oil passage of the crankshaft bearing is V3, and the flow of the cooling nozzle oil passage is V1-V3.

Of course, if the flow of the different branch oil passages in the head cylinder needs to be further detected according to the foregoing, the steps (4) and (5) are continued to be performed after the step (2).

Wherein, step (4) includes:

4.1: and connecting a first plug in the plugging assembly to the oil inlet end of the cylinder body connecting oil duct to plug the cylinder body oil duct, and simultaneously connecting a third plug to the connecting part of the corresponding camshaft oil duct and the variable valve timing oil duct to plug the camshaft oil duct.

4.2: and adjusting the oil pump so that the detection value of the fourth pressure gauge is the corresponding pressure P4 under the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked.

4.3: the flow V4 of the total oil passage is detected by a flow meter.

Thus, the flow rate in the variable valve timing oil passage is V4, and the flow rate of the camshaft oil passage is V2-V4.

Wherein step (5) comprises:

5.1: and connecting a first plug in the plugging assembly to the oil inlet end of the cylinder body connecting oil duct to plug the cylinder body oil duct, and simultaneously connecting a fourth plug to the corresponding hydraulic tappet oil duct to plug the hydraulic tappet oil duct.

5.2: and adjusting the oil pump so that the detection value of the fifth pressure gauge is the corresponding pressure P5 under the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked.

5.3: the flow rate of the total oil passage is detected by a flow meter.

Thus, the flow of the engine oil in the hydraulic tappet oil duct is V2-V5 correspondingly. Accordingly, the camshaft diameter oil passage 304 has a flow rate of V5-V4.

The foregoing description of the preferred embodiments of the present disclosure is provided for the purpose of illustration only, and is not intended to limit the disclosure to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and principles of the disclosure.

Claims (10)

1. The test device of the engine lubricating system of the automobile is characterized by comprising a main oil duct (100), a cylinder body oil duct (200), a cylinder cover oil duct (300) and an oil pump (400), wherein a first end of the main oil duct (100) is communicated with an outlet of the oil pump (400), the cylinder body oil duct (200) comprises a cylinder body connecting oil duct (201) and a plurality of cylinder cover branch oil ducts, one end of the cylinder body connecting oil duct (201) is communicated with a second end of the main oil duct (100), the other end of the cylinder body connecting oil duct (201) is communicated with the plurality of cylinder cover branch oil ducts, the plurality of cylinder cover branch oil ducts are used for supplying oil to different parts to be lubricated in a cylinder body, the cylinder cover oil duct (300) comprises a cylinder cover connecting oil duct (301) and a plurality of cylinder cover branch oil ducts, one end of the cylinder cover connecting oil duct (301) is communicated with a second end of the main oil duct (100), and the other end of the cylinder cover connecting oil duct (301) is communicated with the plurality of branch oil ducts, and the plurality of cylinder cover branch oil ducts are used for supplying oil to different parts to be lubricated in the cylinder cover;

the test device comprises a detection assembly and a plugging assembly, wherein the plugging assembly is detachably connected with the cylinder body oil duct (200) and the cylinder cover oil duct (300) respectively;

The detection assembly comprises at least one cylinder pressure detector (11), at least one cylinder head pressure detector (12) and a flow meter (13), wherein the at least one cylinder pressure detector (11) is connected in the cylinder connecting oil duct (201) and/or the cylinder branch oil duct, the cylinder pressure detector (11) is used for measuring the pressure in a corresponding connected oil duct when neither the cylinder oil duct (200) nor the cylinder head oil duct (300) is blocked, the at least one cylinder head pressure detector (12) is connected in the cylinder head connecting oil duct (301) and/or the cylinder head branch oil duct, and the cylinder head pressure detector (12) is used for measuring the pressure in a corresponding connected oil duct when neither the cylinder oil duct (200) nor the cylinder head oil duct (300) is blocked;

the flowmeter (13) is connected to the main oil duct (100) and is used for detecting the flow of the main oil duct (100) under the condition that the cylinder body oil duct (200) and the cylinder cover oil duct (300) are not plugged, and detecting at least one of the first flow and the second flow, wherein the first flow is the flow of the main oil duct (100) when the cylinder body oil duct (200) is plugged and at least one cylinder cover pressure detector (12) detects the pressure corresponding to the condition that the cylinder body oil duct (200) and the cylinder cover oil duct (300) are not plugged, and the second flow is the flow of the main oil duct (100) when the cylinder cover oil duct (301) is plugged and at least one cylinder body pressure detector (11) detects the pressure corresponding to the condition that the cylinder body oil duct (200) and the cylinder cover oil duct (300) are not plugged.

2. The test device according to claim 1, wherein the plugging assembly comprises two first plugs (21), one of the two first plugs (21) being detachably connected to the cylinder block connecting oil duct (201), the other of the two first plugs (21) being detachably connected to the cylinder head connecting oil duct (301);

the at least one cylinder pressure detector (11) comprises a first pressure gauge (111), the first pressure gauge (111) is connected at the oil inlet end of the cylinder connecting oil duct (201) and is used for detecting the pressure P1 of the cylinder connecting oil duct (201) when the cylinder oil duct (200) and the cylinder cover oil duct (300) are not plugged, the at least one cylinder pressure detector (12) comprises a second pressure gauge (122), and the second pressure gauge (122) is connected at the oil inlet end of the cylinder cover connecting oil duct (301) and is used for detecting the pressure P2 of the cylinder cover connecting oil duct (301) when the cylinder oil duct (200) and the cylinder cover oil duct (300) are not plugged;

the flowmeter (13) is configured to detect a flow V0 of the corresponding total oil passage (100) when neither the cylinder block oil passage (200) nor the cylinder head oil passage (300) is blocked, and when the pressure of the cylinder block oil passage (200) is P1 and the pressure of the cylinder head oil passage (300) is P2;

The flow meter (13) is further used for detecting the flow V1 of the total oil duct (100) under the condition that the oil inlet end of the cylinder cover connecting oil duct (301) is blocked and the pressure of the cylinder body connecting oil duct (201) is P1, or the flow meter (13) is used for detecting the flow V2 of the total oil duct (100) under the condition that the oil inlet end of the cylinder body connecting oil duct (201) is blocked and the pressure of the cylinder cover connecting oil duct (300) is P2.

3. The test device according to claim 2, wherein the plurality of cylinder branch oil passages (202) include a crank oil passage (202), a plurality of cooling nozzle oil passages (203), and a plurality of crank bearing oil passages (204), a middle portion of the crank oil passage (202) is in communication with the second end of the cylinder connecting oil passage (201), an extending direction of the crank oil passage (202) is the same as an axis direction of a crankshaft of the engine, the plurality of cooling nozzle oil passages (203) are arranged at intervals along the extending direction of the crank oil passage (202) and are respectively in communication with the crank oil passage (202), and the plurality of crank bearing oil passages (204) are arranged at intervals along the extending direction of the crank oil passage (202) and are in communication with the crank oil passage (202);

the plugging assembly further comprises a plurality of second plugs (22), the second plugs (22) are arranged in one-to-one correspondence with the cooling nozzle oil channels (203), and the second plugs (22) are detachably connected in the corresponding cooling nozzle oil channels (203);

The at least one cylinder pressure detector (11) further comprises a third pressure gauge (113), the third pressure gauge (113) being connected at one of the plurality of crank bearing oil passages (204) for detecting an oil pressure P3 of the crank bearing oil passage (204) in case neither the cylinder oil passage (200) nor the cylinder head oil passage (300) is blocked;

the flow meter (13) is further used for controlling the flow V3 of the total oil duct (100) under the condition that the cylinder cover connecting oil duct (301) is blocked, the cooling nozzle oil duct (203) is blocked and the oil pressure of the crankshaft bearing oil duct (204) is P3.

4. The test device according to claim 2, wherein the plurality of cylinder head branch oil passages include a variable valve timing oil passage (302), two camshaft oil passages (303), a plurality of camshaft diameter oil passages (304), and a plurality of hydraulic tappet oil passages (305), the variable valve timing oil passage (302) is communicated with a second end of the cylinder head connecting oil passage (301) and is respectively communicated with the two camshaft oil passages (303), the plurality of camshaft diameter oil passages (304) are divided into two groups of camshaft diameter oil passages (304), the two groups of camshaft diameter oil passages (304) are in one-to-one correspondence with the two camshaft oil passages (303), each group includes a plurality of camshaft diameter oil passages (304), the plurality of camshaft diameter oil passages (304) of each group are respectively arranged on the corresponding camshaft oil passage (303) at intervals along the extending direction of the camshaft oil passage (303), the plurality of hydraulic tappet oil passages (305) are also divided into two groups, the plurality of hydraulic tappet oil passages (305) are respectively arranged on the corresponding camshaft oil passages (303) along the extending direction of the camshaft oil passages (303), and communicates with the corresponding camshaft oil passage (303);

The plugging assembly further comprises two third plugs (23), the two third plugs (23) are arranged in one-to-one correspondence with the two camshaft oil channels (303), and the third plugs (23) are detachably connected to the corresponding connection parts of the camshaft oil channels (303) and the variable valve timing oil channels (302);

the at least one cylinder head pressure detector (12) further comprises a fourth pressure gauge (124), wherein the fourth pressure gauge (124) is connected at the variable valve timing oil passage (302) and is used for detecting the oil pressure P4 of the variable valve timing oil passage (302) when the plugging assembly (1) is not plugged in the cylinder body oil passage (200) and the cylinder head oil passage (300);

the flowmeter (13) is further used for detecting the flow V4 of the corresponding total oil passage (100) when the oil pressure of the variable valve timing oil passage (302) is P4 after the cylinder body connecting oil passage (201) is blocked and the camshaft oil passage (303) is blocked.

5. The test device according to claim 4, wherein the plugging assembly (2) further comprises a plurality of fourth plugs (24), the plurality of fourth plugs (24) being arranged in one-to-one correspondence with the plurality of hydraulic tappet oil channels (305), the fourth plugs (24) being detachably connected at the corresponding hydraulic tappet oil channels (305);

The at least one cylinder head pressure detector (12) further comprises a fifth pressure gauge (125), wherein the fifth pressure gauge (125) is connected to one of the camshaft diameter oil passages (304) and is used for detecting the oil pressure P5 of the camshaft diameter oil passage (304) under the condition that the cylinder body oil passage (200) and the cylinder head oil passage (300) are not blocked;

the flowmeter (13) is further used for detecting the flow V5 of the corresponding total oil duct (100) when the oil pressure of the camshaft shaft diameter oil duct (304) is P5 after the cylinder body connecting oil duct (201) is blocked and the hydraulic tappet oil duct (305) is blocked.

6. A method of testing an engine lubrication system of an automobile, the method comprising:

under the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked, oil is supplied to the engine lubricating system through an oil pump, the flow of the total oil duct is detected through the flowmeter, and the pressure in the oil duct correspondingly connected with the cylinder body pressure detector and the cylinder cover pressure detector is measured;

at least one of a first flow and a second flow is obtained through the flowmeter, the first flow is when the cylinder body connecting oil duct is plugged, and when at least one cylinder cover pressure detector detects that the pressure is the pressure corresponding to the condition that the cylinder body oil duct and the cylinder cover oil duct are not plugged, the second flow is when the cylinder cover connecting oil duct is plugged, and when at least one cylinder body pressure detector detects that the pressure is the pressure corresponding to the condition that the cylinder body oil duct and the cylinder cover oil duct are not plugged, the total oil duct is sealed.

7. The method of testing of claim 6, wherein the obtaining the first flow rate or the second flow rate through the flow meter comprises:

connecting the plugging assembly to the oil inlet end of the cylinder cover connecting oil duct to plug the cylinder cover connecting oil duct;

the oil pump is regulated, so that the detection value of the first pressure gauge is the corresponding pressure P1 under the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked;

detecting the flow V1 of the total oil duct through a flowmeter to obtain the first flow;

and/or the number of the groups of groups,

connecting the plugging assembly to the oil inlet end of the cylinder connecting oil duct to plug the cylinder connecting oil duct;

the oil pump is regulated, so that the detection value of the second pressure gauge is the corresponding pressure P2 under the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked;

and detecting the flow V2 of the total oil duct through a flowmeter to obtain the second flow.

8. The assay of claim 7, further comprising:

the plugging assembly is connected to the oil inlet end of the cylinder cover connecting oil duct and is simultaneously connected to the cooling nozzle oil duct to plug the cylinder cover connecting oil duct and the cooling nozzle oil duct;

The oil pump is regulated, so that the detection value of the third pressure gauge is the corresponding pressure P3 under the condition that the cylinder body oil duct and the cylinder cover oil duct are not blocked;

and detecting the flow V3 of the total oil duct through a flowmeter.

9. The assay of claim 7, further comprising:

the plugging assembly is connected to the oil inlet end of the cylinder body connecting oil duct and is connected between a camshaft oil duct and a variable valve timing oil duct so as to plug the cylinder body connecting oil duct and the camshaft oil duct;

the oil pump is regulated, so that the detection value of the fourth pressure gauge is the corresponding pressure P4 under the condition that the cylinder body connecting oil duct and the cylinder cover oil duct are not blocked;

and detecting the flow V4 of the total oil duct through a flowmeter.

10. The assay of claim 8, further comprising:

the plugging assembly is connected to the oil inlet end of the cylinder connecting oil duct and is connected to the hydraulic tappet oil duct so as to plug the cylinder connecting oil duct and the hydraulic tappet oil duct;

the oil pump is regulated so that the pressure of a camshaft shaft diameter oil passage is the corresponding pressure P5 under the condition that the cylinder body oil passage and the cylinder cover oil passage are not blocked;

And detecting the flow V5 of the total oil duct through a flowmeter.