CN111678684B - Detection test method for optimal oil injection amount of lubricating oil of to-be-detected electric drive system - Google Patents
Detection test method for optimal oil injection amount of lubricating oil of to-be-detected electric drive system Download PDFInfo
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Abstract
A detection test method for the optimal oil injection amount of lubricating oil of an electric drive system comprises the steps of placing the electric drive system to be detected on a test bed for detection test; the optimal oil filling amount of the electric drive system to be detected is obtained by changing the oil filling amount, carrying out performance detection under the conditions of different oil filling amounts, and analyzing the detection result after comparing the performance conditions of all aspects under the conditions of the oil filling amounts. The invention provides a method for detecting the optimal oil filling amount of an electric drive system through analysis, effectively overcomes the defect that the current lubricating oil of the electric drive system has no optimal oil filling amount detection method, and can detect and measure the optimal lubricating oil amount required by the electric drive system at any time according to various working conditions of the electric drive system; the method has the characteristics of simplicity, convenience, reliability and easiness in operation, and has practical popularization and application values.
Description
Technical Field
The invention relates to a detection test method of an electric drive system to be detected, in particular to a detection test method of the optimal oil injection amount of lubricating oil of the electric drive system to be detected; the detection test method for the optimal lubricating oil filling amount of the electric driving system to be detected can determine the optimal lubricating oil filling amount of the electric driving system to be detected under a certain working condition through a detection test; belonging to the technical field of detection of electric drive systems to be detected.
Background
The market demand change of new energy automobiles accelerates the development of the integration and lightweight technology of the electric drive system, so that the highly integrated electric drive system becomes a research hotspot; the high integration can greatly reduce the size of an electric drive system to support the compact layout of a new energy vehicle type, the light weight can reduce the load of the new energy vehicle to improve the endurance mileage and the controllability, and the two drive the cooling mode of the motor to develop from water cooling to oil cooling; among them, the electric drive system to be tested represented by tesla model3 powertrain is becoming an important direction for high-end products. However, in the electric drive integrated system based on the oil-cooled motor and the forced lubrication technology, the lubricating oil of the electric drive system is used for cooling the motor, and the quantity of the lubricating oil is determined while considering a plurality of influences such as mechanical lubrication, motor heat dissipation, system efficiency and the like; compared with the traditional electric drive system, the oil quantity determination of the electric drive system to be detected is a technical difficulty, the cooling oil quantity is too large, the cost is increased, the cooling oil quantity is too small, the heat capacity is limited, the temperature of lubricating oil can be sharply increased due to the instantaneous high-power operation of a motor, the viscosity of the lubricating oil is reduced, a lubricating oil film in a friction pair is difficult to form, the abrasion is aggravated, the noise is increased, and even the leakage is caused; the lack of sophisticated experience in this respect, and in particular the lack of associated testing and testing means and methods, has made testing in accordance with conventional transmissions unsuitable and therefore has necessitated considerable research.
Through patent search, no relevant patent technical literature reports are found, the most relevant patent technical literature is a paper, and the relevant literature includes the following:
1. the patent number CN201210037300.8 is an invention patent named as 'a method for determining the preferable oil feeding amount of gearbox lubricating oil', and the patent discloses a method for determining the preferable oil feeding amount of the gearbox lubricating oil based on the temperature and the power loss of the lubricating oil, belonging to the technical field of gearbox lubrication. The method comprises the following steps: setting experiment parameters; and measuring the power loss and the lubricating oil temperature of the gear box under different oil filling quantities, further obtaining a relation curve of the power loss and the lubricating oil temperature with the oil filling quantity, and comparing the oil filling quantity-power loss curve and the oil filling quantity-lubricating oil temperature curve to obtain the optimal oil filling quantity of the lubricating oil of the gear box. The method can be used for determining the optimal oil filling amount of the gearbox lubricating oil under a certain working condition, so that the sufficient lubrication and the lower lubricating oil temperature of the gearbox are realized, but the oil amount of the electric drive system lubricating oil cannot be detected.
2. The invention has the patent number of CN201910905818.0, and is named as 'a testing device and a testing method for a transmission oil spraying system', and the patent discloses a testing device and a testing method for a transmission oil spraying system, wherein the testing device comprises a supporting component, a plurality of oil receiving pipes, an oil guide pipe and a flow detector, and the supporting component rotates on an oil sprayer of a transmission to be tested; the oil receiving pipe is arranged along the length direction of the oil sprayer, the oil receiving pipe is arranged on the supporting assembly, and an oil receiving port of the oil receiving pipe is arranged opposite to the oil spraying hole of the oil sprayer so that the oil receiving port receives lubricating oil sprayed by the oil spraying hole; the oil guide pipe and the oil receiving pipe are correspondingly arranged, the oil receiving pipe is connected with the corresponding oil guide pipe, and lubricating oil in the oil guide pipe can flow back to the transmission to be tested; the oil guide pipe or the oil receiving pipe is provided with a flow detector. The method also cannot detect the amount of lubricating oil in the electric drive system.
3. The invention discloses a gearbox lubricating oil distribution simulation test system which is a patent with the patent number of CN200910258887.3 and is named as a gearbox lubricating oil distribution simulation test system, and the patent discloses the gearbox lubricating oil distribution simulation test system which is used for detecting the through-flow oil quantity of each test transmission shaft and comprises a hydraulic pump station, a test bench, a plurality of screw plugs, a connecting pipeline and a plurality of metering devices; the hydraulic pump station is used for providing test lubricating oil; the test bench is used for placing each test transmission shaft; the screw plugs are used for being matched with threaded holes of parts to be lubricated on the test transmission shafts and are provided with axial through holes; the connecting pipeline is used for communicating an oil outlet of the hydraulic pump station with oil inlets of the test transmission shafts; the metering devices are respectively arranged corresponding to the screw plugs and used for metering the oil outlet amount of each screw plug. But the system cannot detect the amount of oil in the electric drive system.
Through the analysis of the above documents, although there are studies on the amount of oil to be detected in the electric drive system, some have proposed a test system for the distribution of lubricating oil; however, it is not necessary to provide a method for testing the amount of lubricating oil in an electric drive system to be tested, and further research is needed.
Disclosure of Invention
The invention aims to provide a detection test method for the optimal oiling amount of lubricating oil of an electric drive system to be detected, aiming at the defect that the oil amount of the lubricating oil of the existing electric drive system to be detected is lack of an effective detection method.
In order to achieve the purpose, the invention provides a detection test method for the optimal oil injection amount of lubricating oil of an electric drive system to be detected, wherein the electric drive system to be detected is placed on a test bed for detection test; the optimal oil filling amount of the electric drive system to be detected is obtained by changing the adding oil filling amount, carrying out performance detection under the conditions of different oil filling amounts and comparing the performance conditions of all aspects under the conditions of the oil filling amounts and analyzing the detection result.
Further, the electric drive system to be detected is placed on the test bench: the test bed for the complete assembly of the electric drive system is established, the whole electric drive system to be detected is installed on the test bed according to the installation angle consistent with the arrangement of the whole vehicle, the whole placing angle of the electric drive system to be detected is consistent with the arrangement of the whole vehicle, and then the electric drive system to be detected is connected with detection equipment, so that detection can be started.
Furthermore, the detection test is carried out by firstly calculating the theoretical basic oil injection amount of the electric drive system to be detected after the product is designed and shaped; and then, taking the designed theoretical basic oil injection amount as the reference oil amount of the bench test to perform the test, and comprehensively designing calculation and test results to determine the optimal lubricating oil injection amount of the electric drive system to be detected after the test is completed.
Further, the step of changing the added oil filling amount is to calculate the theoretical basic oil filling amount of the electric drive system to be detected; and then, the theoretical basic oil injection amount is used as a reference, and the test data of 5-9 groups of oil injection amounts are detected by sequentially increasing and decreasing the oil injection amount.
Further, the performance detection under the condition of different oil filling amounts is to perform the performance detection under the condition of different oil filling amounts from the temperature test and the system efficiency test of the electric driving system; determining the optimal basic oil filling amount of the electric drive system to be detected through a temperature test; determining the optimal lubricating oil filling quantity of the electric drive system to be detected through a system efficiency test
Further, the temperature test is carried out according to the requirements of working conditions, the temperatures in different time periods are recorded, the temperature change trends are compared under the condition of different oil injection amounts, and when the oil injection amount reaches a certain amount, the difference of temperature change curves obtained by adding different oil injection amounts is not large, the oil injection amount is determined as the basic oil injection amount.
Further, in the system efficiency test, after the optimal basic oil injection amount is determined, the theoretical oil injection amount required by lubrication of the electric drive system to be detected is further determined according to the lubrication condition of the speed reducer, and the theoretical oil injection amount is compared with the optimal basic oil injection amount to obtain the basic oil detection amount; and then, carrying out a system efficiency comparison test on the basis of the basic oil quantity detection, carrying out a system efficiency test by changing the oil injection quantity, and taking the oil injection quantity with the highest system efficiency as the optimal oil injection quantity of the electric drive system to be detected.
Further, the determination of the theoretical lubricating oil injection amount is obtained by determining the oil injection amount required by the electric drive system to be detected according to the lubricating condition of the speed reducer and calculating; the theoretical lubricating oil injection quantity comprises a normal lubricating oil injection quantity meeting the requirement of normal speed reducer lubrication and an active lubricating oil injection quantity meeting active lubrication; after the theoretical lubricating oil filling amount is obtained through calculation, the theoretical lubricating oil filling amount is compared with the basic oil filling amount; detecting the amount of oil based on the basic amount of oil filling if the theoretical amount of oil filling is less than the basic amount of oil filling; otherwise, the theoretical lubricating oil injection quantity is taken as a basis for detecting the oil quantity, and the basic oil quantity detection is taken as an efficiency test basis; and then, carrying out a system efficiency comparison test on the basis of basic oil quantity detection, selecting the lowest assembly temperature as the assembly temperature of the system efficiency comparison test, carrying out the system efficiency test by changing the oil injection quantity, and taking the oil injection quantity with the highest system efficiency as the optimal oil injection quantity.
Further, the system efficiency comparison test is to change the oil injection amount by 0.03L-0.2L every time to test the system efficiency at multiple points, and the minimum oil injection amount when the efficiency is highest is taken as the determined optimal oil injection amount.
Further, the steps of the electric drive system to be detected for the optimal oil filling amount are as follows:
1) selecting an operation condition;
2) selecting a test bed according to the operation condition;
3) mounting the electric drive system to be detected on a test bed, ensuring that the whole electric drive system to be detected is mounted on the test bed according to a mounting angle consistent with the arrangement of the whole vehicle, ensuring that the whole placing angle of the electric drive system to be detected is consistent with the arrangement of the whole vehicle, and then connecting detection equipment to start detection;
4) determining a theoretical basic oil filling amount; calculating to obtain theoretical basic oil injection quantity according to the heat dissipation requirement of the electric drive system to be detected;
5) carrying out a temperature detection test on the basis of the basic oil injection amount, detecting the basic oil injection amount of an electric drive system filling theory, and carrying out the temperature detection test under the conditions of different oil injection amounts to obtain the optimal basic oil injection amount; the temperature test is carried out according to the requirements of working conditions, the temperatures in different time periods are recorded, the temperature change trends are compared under the condition of different oil injection amounts, and the oil injection amount is determined as the optimal basic oil injection amount if the difference of temperature change curves obtained by adding different oil injection amounts is not large after the oil injection amount reaches a certain amount;
6) according to products, calculating theoretical lubricating oil injection amount and determining the oil injection amount required by the electric drive system to be detected according to the lubricating conditions of the speed reducer; the theoretical lubricating oil injection quantity comprises a normal lubricating oil injection quantity meeting the requirement of normal speed reducer lubrication and an active lubricating oil injection quantity meeting active lubrication;
7) on the basis of the theoretical lubricating oil injection quantity, comparing the theoretical lubricating oil injection quantity with the basic oil injection quantity, and determining the basic detection oil quantity;
8) the method comprises the steps of filling a basic detection oil quantity in an electric drive system to be detected, carrying out system efficiency comparison detection tests on the basis of the basic detection oil quantity, respectively carrying out system efficiency detection tests under the conditions of different oil injection quantities, and selecting the minimum oil injection quantity under the highest system efficiency as the optimal oil injection quantity.
The invention has the advantages that:
the invention provides a method for preventing an electric drive system to be detected from being arranged on a detection rack through analysis, and the optimal lubricating oil quantity of the electric drive system to be detected is detected through detecting the efficiency of the working condition system under different oil quantities, so that the defect that no method for determining the lubricating oil quantity of the electric drive system to be detected exists at present is effectively overcome, the method has practical operation value, and the lubricating oil quantity required by the electric drive system to be detected can be determined at any time according to the standard circulating working condition of the electric drive system to be detected. The method has the characteristics of simplicity, convenience, reliability and easiness in operation.
Drawings
FIG. 1 is a basic flow chart for determining the amount of lubricating oil in accordance with one embodiment of the present invention;
FIG. 2 is a graph of the relationship between time and temperature for different amounts of oil under WLTC conditions;
FIG. 3 is a graph of the relationship between the rotating speed and the power consumption of different oil quantities under the WLTC working condition.
Detailed Description
The invention will be further elucidated with reference to the drawings and specific embodiments.
Example one
A detection test method for the optimal oil injection amount of lubricating oil of an electric drive system to be detected based on the WLTC working condition is characterized in that the electric drive system to be detected is placed on a test bed for detection test; the optimal oil filling amount of the electric drive system to be detected is obtained by changing the added oil filling amount, carrying out performance detection under different oil filling amounts and comparing performance conditions of various aspects under various oil filling amount conditions and analyzing a detection result; the basic flow of detection is shown in figure 1.
The specific detection test steps and methods are as follows:
1) selecting an operation condition;
selecting working conditions according to the working conditions to be operated of the electric drive system to be detected, and determining the WLTC working conditions;
2) selecting a test bed according to the operation condition;
selecting and utilizing the existing endurance test bed to carry out a detection test by considering the characteristics of an electric drive system to be detected; a speed reduction mounting bracket is arranged on the test bed (the mounting angle of the electric drive system is ensured to be consistent with the arrangement of the whole vehicle);
3) mounting the electric drive system to be detected on a test bed, ensuring that the whole electric drive system to be detected is mounted on the test bed according to a mounting angle consistent with the arrangement of the whole vehicle, ensuring that the whole placing angle of the electric drive system to be detected is consistent with the arrangement of the whole vehicle, and then connecting detection equipment to start detection;
the connection detecting device includes:
a) a rotation speed sensor: arranging and mounting a rotating speed sensor at a rotating shaft of the electric drive system;
b) a temperature measuring instrument: respectively mounting temperature sensors at a motor bearing of the electric drive system and a shell of the reduction gearbox;
c) a timer;
4) determining and calculating a theoretical basic oil filling amount; calculating to obtain theoretical basic oil injection quantity according to the heat dissipation requirement of the electric drive system to be detected;
the theoretical basic oil injection amount can be calculated by referring to the existing calculation method, and when the heat balance of the system under reasonable working conditions is considered, the basic oil injection amount required by cooling of the electric drive system is determined according to the principle that the total heating amount of the system is equal to the total heat dissipation amount of the system; however, because the existing calculation method is incomplete, the basic oil filling amount can be determined by a basic oil filling amount detection test through a temperature detection test, so that the optimal basic oil filling amount is obtained;
5) carrying out a temperature detection test on the basis of the theoretical basic oil injection amount; the temperature test is carried out according to the working condition requirement, the temperature of inlet cooling liquid is ensured to be constant, and the specific numerical value of the constant temperature of the cooling liquid is determined according to the temperature of an efficiency test of an industrial standard; the method comprises the steps of setting according to inlet temperatures of cooling liquid of a motor and an electric control efficiency test, recording model machine temperatures in different time periods, comparing temperature change trends under the condition of different oil injection amounts, finding that after the oil injection amount reaches a certain amount, the difference of model machine temperature change curves obtained by adding different oil injection amounts is not large, and determining the oil injection amount as the optimal basic oil injection amount.
The temperature test of the embodiment is that the test working condition of the selected assembly test is; under the working condition of WLTC, the temperature of inlet cooling liquid of a cooling system is ensured to be constant, and the temperature of a sample machine can be continuously increased under the working condition until the temperature of the sample machine is unchanged, wherein the temperature is the measured test temperature; performing tests under different oil injection quantities, and comparing test temperatures measured under the oil injection quantities; based on the allowable temperature value determined by the electric drive system, the minimum fill level at the allowable temperature value is determined as the optimum base fill level. The detection test result is shown in figure 2, and it can be seen from figure 2 that under the WLTC working condition, the temperature of a sample machine changes along with the change of the vehicle speed; 2. when the circulation is finished, the oil amount is 0.5L and 1L, the highest sample machine temperature exceeds 100 ℃, certain hidden danger exists, the oil temperature of other oil amounts is less than 100 ℃, the operation is safe, and the oil temperature is almost the same; the optimum basic oil filling amount analyzed by the test of this example was 2L.
6) Calculating the theoretical lubricating oil injection quantity according to the product; the determination theoretic lubricating oil injection amount is the lubricating oil injection amount required by the electric drive system to be detected according to the lubricating condition of the speed reducer and can be obtained by calculation; the theoretical lubricating oil injection amount comprises the lubricating oil amount required by meeting the splash lubrication of the speed reducer and the active lubricating oil injection amount meeting the active lubrication; the method comprises the following steps that the oil quantity of lubricating oil required by the splash lubrication of the speed reducer is determined according to the oil injection quantity standard of the splash lubrication of the speed reducer, and the active lubricating oil injection quantity of the active lubrication is calculated and determined according to the structure of an electric drive system to be detected; after the theoretical lubricating oil injection amount is obtained through calculation, the theoretical lubricating oil injection amount is compared with the basic oil injection amount; detecting the amount of oil based on the basic amount of oil filling if the theoretical amount of oil filling is less than the basic amount of oil filling; otherwise, the theoretical lubricating oil injection quantity is taken as a basis for detecting the oil quantity, and the basic oil quantity detection is taken as an efficiency test basis;
because the electric drive system is formed by integrating the gearbox and the motor, and the lubrication and cooling of the motor are also performed through oil cooling, the oil quantity required by the lubrication of a normal speed reducer and the oil quantity required by active lubrication need to be ensured while the cooling of the system is ensured, so that the lubricating oil injection quantity required by the lubrication of the electric drive system is determined to comprise two aspects of the oil quantity required by the lubrication of the normal speed reducer and the lubricating oil injection quantity required by the active lubrication. The theoretical lubricating oil injection quantity can be calculated respectively according to three parts of an electric drive system to be detected and then summarized into the theoretical lubricating oil injection quantity; comprises three parts of oil mass; the first part of oil is oil required by normal speed reducer lubrication; the second part of oil is in a working state, and the inlet of the oil pump must keep the oil quantity of the lubricating oil at any time; the third part of oil is the amount of lubrication oil required by the volume of an oil pipeline of the cooling system of the whole electric drive system. The three-part oil quantity determination principle is as follows:
(1) calculating and determining a first part of oil quantity required by lubrication according to a normal speed reducer oil quantity determining condition;
(2) considering the active lubrication condition, calculating the second part of oil quantity required for completely immersing the oil pump inlet into the lubricating liquid in a standing state;
(3) calculating a third part of oil quantity required by the volume sum of the lubricating oil channels of the whole electric drive system;
7) on the basis of the theoretical lubricating oil injection quantity, comparing the theoretical lubricating oil injection quantity with the basic oil injection quantity, and determining the basic detection oil quantity;
comparing the theoretical lubricating oil filling amount with the basic oil filling amount, and detecting the oil amount on the basis of the basic oil filling amount if the theoretical lubricating oil filling amount is smaller than the basic oil filling amount; detecting the amount of oil based on the theoretical amount of lubrication fill if the theoretical amount of lubrication fill is greater than the basic amount of fill; and considering the heat capacity factor, the basic detection oil quantity is required to be more than 1L. The theoretical amount of lubrication filling 2.3L of this embodiment is larger than the basic amount of filling 2L, and therefore the amount of oil is detected on the basis of the theoretical amount of lubrication filling being 2.3L;
8) filling basic detection oil quantity into an electric drive system to be detected, carrying out a system efficiency comparison detection test on the basis of the basic detection oil quantity, respectively carrying out system efficiency detection tests under the conditions of different oil injection quantities, and selecting the minimum oil injection quantity under the highest system efficiency as the optimal oil injection quantity;
the system efficiency test comprises the steps of further determining theoretical lubricating oil injection amount required by lubrication of an electric drive system to be detected according to lubrication conditions of a speed reducer after determining the optimal basic oil injection amount, and comparing the theoretical lubricating oil injection amount with the optimal basic oil injection amount to obtain basic detection oil amount; carrying out a system efficiency comparison test on the basis of the basic oil quantity detection, selecting the lowest assembly temperature as the assembly temperature of the system efficiency comparison test, carrying out the system efficiency test by changing the oil injection quantity, and taking the oil injection quantity with the highest system efficiency as the optimal oil injection quantity of the to-be-detected electric drive system; when the test is carried out, an assembly temperature range is determined, the temperature range can be determined according to the temperature range of the basic oil injection quantity, the temperature of the efficiency test of the industry standard can also be determined, and the lowest assembly temperature is selected as the tested assembly temperature in the efficiency test standards of the motor, the electronic control and the speed reducer.
The system efficiency comparison test is to carry out multipoint system efficiency test according to the increase and decrease of the oil injection amount of 0.03L-0.2L each time, the increase and decrease of the oil injection amount are carried out in sequence to detect the test data of 5-9 groups of oil injection amounts, and the minimum oil injection amount when the efficiency is highest is taken as the determined optimal oil injection amount.
Fig. 3 is a graph of operating efficiency under different conditions of oil quantity detection obtained by operating efficiency detection performed in the present embodiment, and it is determined by the foregoing calculation that the basic detected oil quantity is 2L, and therefore, the operating efficiency and the vehicle speed are obtained by performing detection every 0.05L based on 2L as the detection basis, and as can be seen from the graph, it is shown from the test data that the system power consumption is the least when the oil quantity is 2.45-2.5L, so the optimal oil quantity is 2.5L.
Example two
The basic method of the second embodiment is the same as that of the first embodiment, but the working conditions are different, so that the optimal oil filling amount is different; a detection test method for the optimal oil injection amount of lubricating oil of an electric drive system to be detected under a high-speed working condition is characterized in that the electric drive system to be detected is placed on a test bed for detection test; the optimal oil filling amount of the electric drive system to be detected is obtained by changing the adding oil filling amount, carrying out performance detection under the conditions of different oil filling amounts and comparing the performance conditions of all aspects under the conditions of the oil filling amounts and analyzing the detection result.
The specific detection test steps and methods are as follows:
1) selecting the operation working condition as a high-speed working condition;
2) determining a basic oil filling amount according to the requirement of cooling and heat dissipation of an electric drive system; further determining by adopting a temperature detection mode; the temperature test is carried out according to the requirements of working conditions, the temperatures in different time periods are recorded, the temperature change trends are compared under the condition of different oil injection amounts, and the oil injection amount is determined as the optimal basic oil injection amount if the difference of temperature change curves obtained by adding different oil injection amounts is not large after the oil injection amount reaches a certain amount; the detection result of the embodiment is that the basic oil filling amount is 1.5L for the requirement of cooling and heat dissipation of the electric drive system;
3) calculating and determining a first part of oil quantity required by lubrication according to the normal speed reducer oil quantity determining condition; the first part of oil mass is calculated and determined to be 1.1L according to the normal speed reducer oil mass determination condition;
4) considering the active lubrication condition, calculating the second part of oil quantity required for completely immersing the oil pump inlet into the lubricating liquid in a standing state; calculating the second part of oil quantity required for completely immersing the oil pump inlet into the lubricating liquid under a standing state to be 0.2L according to the structure of an electric drive system;
5) calculating a third part of oil quantity required by the volume sum of the lubricating oil gallery of the whole electric driving system; according to the structure of the electric drive system, the third part of oil quantity required by the volume sum of the lubricating oil passage of the whole electric drive system is calculated to be 0.1L;
6) adding the sum of the oil quantities of the three parts to obtain the theoretical oil injection quantity of 1.4L;
7) comparing the theoretical oiling amount with the basic oiling amount, and detecting the oil amount on the basis of the basic oiling amount 1.5L as the theoretical oiling amount is less than the basic oiling amount 1L;
8) and (3) carrying out working condition efficiency detection by taking the basic detection oil quantity 1.5L as a detection basis, increasing and decreasing the efficiency of the test system according to 0.03L, and detecting for 5 times in total, wherein the minimum oil injection quantity when the system efficiency is the highest is taken as the determined optimal lubricating oil injection quantity which is 1.5L.
EXAMPLE III
The basic method of the third embodiment is the same as that of the third embodiment, but the working conditions are different, so the optimal oil filling amount is different; a detection test method for the optimal oil injection amount of lubricating oil of an electric drive system to be detected under a high-torque working condition is characterized in that the electric drive system to be detected is placed on a test bed for detection test; the optimal oil filling amount of the electric drive system to be detected is obtained by changing the adding oil filling amount, carrying out performance detection under the conditions of different oil filling amounts and comparing the performance conditions of all aspects under the conditions of the oil filling amounts and analyzing the detection result.
The specific detection test steps and methods are as follows:
1) selecting an operation working condition as a high-torque working condition;
2) determining a basic oil filling amount according to the requirement of cooling and heat dissipation of an electric drive system; determining by adopting a detection mode, wherein the detection result is that the basic oil injection amount is 0.9L determined by the cooling and heat dissipation requirements of the electric drive system; considering the influence of heat capacity, selecting the basic oil injection amount to be 1L;
3) calculating and determining a first part of oil quantity required by lubrication according to the normal speed reducer oil quantity determining condition; the first part of oil mass is calculated and determined to be 1.2L according to the normal speed reducer oil mass determination condition;
4) considering the active lubrication condition, calculating the second part of oil quantity required for completely immersing the oil pump inlet into the lubricating liquid in a standing state; calculating the second part of oil quantity required for completely immersing the oil pump inlet into the lubricating liquid under a standing state to be 0.2L according to the structure of an electric drive system;
5) calculating a third part of oil quantity required by the volume sum of the lubricating oil channels of the whole electric drive system; according to the structure of the electric drive system, the third part of oil quantity required by the volume sum of the lubricating oil passage of the whole electric drive system is calculated to be 0.1L;
6) adding the sum of the oil quantities of the three parts to obtain 1.5L of theoretical oil injection quantity;
7) comparing the theoretical oiling amount with the basic oiling amount, and detecting the oil amount on the basis of the theoretical oiling amount of 1.5L as the theoretical oiling amount of 1.5L is larger than the basic oiling amount of 1L;
8) and the basic detection oil quantity 1.5L is used as a detection basis, the working condition efficiency is detected, the efficiency of the test system is increased or decreased according to 0.2L, and the oil quantity with the working condition efficiency closest to the determined working condition efficiency is used as the determined optimal lubricating oil injection quantity which is 1.4L.
The above listed embodiments are only for clear and complete description of the technical solution of the present invention with reference to the accompanying drawings; it should be understood that the embodiments described are only a part of the embodiments of the present invention, and not all embodiments, and the terms such as "upper", "lower", "front", "back", "middle", etc. used in this specification are for clarity of description only, and are not intended to limit the scope of the invention, which can be implemented, and the changes or modifications of the relative relationship thereof are also regarded as the scope of the invention without substantial technical changes. Meanwhile, the structures, the proportions, the sizes, and the like shown in the drawings are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the conditions under which the present invention can be implemented, so that the present invention has no technical essence, and any structural modification, changes in proportion relation, or adjustments of the sizes, can still fall within the range covered by the technical contents disclosed in the present invention without affecting the effects and the achievable purposes of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention has the advantages that:
the invention provides a method for preventing an electric drive system to be detected from being arranged on a detection rack through analysis, and the optimal lubricating oil quantity of the electric drive system to be detected is detected through detecting the efficiency of the working condition system under different oil quantities, so that the defect that no method for determining the lubricating oil quantity of the electric drive system to be detected exists at present is effectively overcome, the method has practical operation value, and the lubricating oil quantity required by the electric drive system to be detected can be determined at any time according to the standard circulating working condition of the electric drive system to be detected. The method has the characteristics of simplicity, convenience, reliability and easiness in operation.
This has several advantages:
1. the invention provides the method for detecting the optimal oil injection quantity of the electric drive system for the first time, provides specific detection steps and fills the blank of the industry;
2. the provided method for detecting the optimal oil filling amount of the electric drive system is combined from theoretical calculation to test detection, effectively makes up the defects of simple calculation in the past, and has a value of specific practical application;
3. the detection experiment method required by the invention can be finished by directly utilizing the existing endurance test bed without additionally arranging experimental equipment, and the detection is convenient.
Claims (5)
1. A detection test method for the optimal oil injection amount of lubricating oil of an electric drive system is characterized by comprising the following steps: placing an electric drive system to be detected on a test bed for detection test; the optimal oil filling amount of the electric drive system to be detected is obtained by changing the added oil filling amount, carrying out performance detection under different oil filling amounts and comparing performance conditions of various aspects under various oil filling amount conditions and analyzing a detection result; the test bed is characterized in that the test bed is used for establishing a complete assembly body of the electric drive system when the electric drive system to be detected is placed on the test bed, the whole electric drive system to be detected is arranged on the test bed according to the installation angle consistent with the arrangement of the whole vehicle, so that the placing angle of the whole electric drive system to be detected is consistent with the arrangement of the whole vehicle, and then the test bed is connected with detection equipment to start a detection test; the detection test is carried out by firstly calculating the theoretical basic oil injection amount of the electric drive system to be detected after the product is designed and shaped; then, taking the designed theoretical basic oil injection amount as the reference oil amount of the bench test to perform the test, and comprehensively designing calculation and testing results to determine the optimal lubricating oil injection amount of the electric drive system to be detected after the test is completed; the performance detection under the condition of different oil filling amounts is performed from two aspects of a temperature test and a system efficiency test of an electric drive system; determining the optimal basic oil injection amount of the electric drive system to be detected through a temperature test; determining the optimal lubricating oil filling amount of the electric drive system to be detected through a system efficiency test; the system efficiency test comprises the steps of further determining theoretical lubricating oil injection amount required by lubrication of an electric drive system to be detected according to lubrication conditions of a speed reducer after determining the optimal basic oil injection amount, and comparing the theoretical lubricating oil injection amount with the optimal basic oil injection amount to obtain basic detection oil amount; carrying out a system efficiency comparison test on the basis of the basic oil quantity detection, carrying out a system efficiency test by changing the oil injection quantity, and taking the oil injection quantity with the highest system efficiency as the optimal oil injection quantity of the electric drive system to be detected; the determination theoretic lubrication oil injection amount is obtained by determining the oil injection amount required by the electric drive system to be detected according to the lubrication condition of the speed reducer and calculating; the theoretical lubricating oil injection quantity comprises a normal lubricating oil injection quantity meeting the requirement of normal speed reducer lubrication and an active lubricating oil injection quantity meeting active lubrication; after the theoretical lubricating oil filling amount is obtained through calculation, the theoretical lubricating oil filling amount is compared with the optimal basic oil filling amount; detecting the amount of oil based on the optimum base amount of oil filling if the theoretical amount of oil filling is less than the optimum base amount of oil filling; otherwise, the theoretical lubricating oil injection quantity is taken as a basis for detecting the oil quantity, and the basic oil quantity detection is taken as an efficiency test basis; and then, carrying out a system efficiency comparison test on the basis of basic oil quantity detection, selecting the lowest assembly temperature as the assembly temperature of the system efficiency comparison test, carrying out the system efficiency test by changing the oil injection quantity, and taking the oil injection quantity with the highest system efficiency as the optimal oil injection quantity.
2. The method for testing the optimum amount of lubricant as set forth in claim 1, wherein: said varying of the amount of fueling is based upon a determined theoretical base amount of fueling; and then, by taking the theoretical basic oil injection amount as a reference, increasing and decreasing the oil injection amount in turn to detect the test data of 5-9 groups of oil injection amounts.
3. The method for testing the optimum amount of lubricant as set forth in claim 1, wherein: the temperature test is carried out according to the requirements of working conditions, the temperatures in different time periods are recorded, the temperature change trends are compared under the condition of different oil injection amounts, the difference of temperature change curves obtained by adding different oil injection amounts is not large after the oil injection amount reaches a certain amount, and the oil injection amount is determined as the optimal basic oil injection amount.
4. The method for testing the optimum oiling rate of lubricating oil for electric drive systems according to claim 1, characterized in that: the system efficiency comparison test is to change the oil injection amount according to the increase and decrease of 0.03L-0.2L every time to test the system efficiency at multiple points, and the minimum oil injection amount when the efficiency is highest is taken as the determined optimal oil injection amount.
5. The method for testing the optimum amount of lubricant as set forth in claim 1, wherein: the steps of the optimal oil filling amount of the electric drive system to be detected are as follows:
1) selecting an operation condition;
2) selecting a test bed according to the operation condition;
3) mounting the electric drive system to be detected on a test bed, ensuring that the whole electric drive system to be detected is mounted on the test bed according to a mounting angle consistent with the arrangement of the whole vehicle, ensuring that the whole placing angle of the electric drive system to be detected is consistent with the arrangement of the whole vehicle, and then connecting detection equipment to start detection;
4) determining and calculating theoretical basic oil filling amount; calculating to obtain theoretical basic oil injection quantity according to the heat dissipation requirement of the electric drive system to be detected;
5) carrying out a temperature detection test on the basis of the theoretical basic oil injection amount, detecting the theoretical basic oil injection amount of the filling of an electric driving system, and carrying out the temperature detection test according to different oil injection amounts to obtain the optimal basic oil injection amount;
6) calculating the theoretical lubricating oil injection quantity according to the product; determining the oil injection amount required by the electric drive system to be detected according to the lubrication condition of the speed reducer; the theoretical lubricating oil injection quantity comprises a normal lubricating oil injection quantity meeting the requirement of normal speed reducer lubrication and an active lubricating oil injection quantity meeting active lubrication;
7) on the basis of the theoretical lubricating oil injection quantity, comparing the theoretical lubricating oil injection quantity with the optimal basic oil injection quantity, and determining the basic detection oil quantity;
8) filling a basic detection oil quantity into an electric drive system to be detected, carrying out a system efficiency comparison detection test on the basis of the basic detection oil quantity, respectively carrying out a system efficiency detection test under the conditions of different oil injection quantities, and selecting the minimum oil injection quantity under the highest system efficiency as the optimal oil injection quantity.
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| CN114295366A (en) * | 2021-12-31 | 2022-04-08 | 中国第一汽车股份有限公司 | System and method for testing lubricating oil quantity and ventilation of transmission |
| CN115681475B (en) * | 2022-12-30 | 2023-03-21 | 苏州亚太精睿传动科技股份有限公司 | Automatic calibration method and system for gearbox lubricating oil filling amount |
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| CN101738231B (en) * | 2009-12-29 | 2011-08-31 | 徐工集团工程机械股份有限公司科技分公司 | Gear-box lubricating oil allotting simulation test system and test method |
| CN102589635B (en) * | 2012-02-17 | 2013-12-11 | 清华大学 | Method for determining preferable refueling volume of gear case lubricating oil |
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