CN116106173B - Engine oil viscosity measurement method for new energy automobile - Google Patents
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Abstract
The invention relates to the field of measurement, in particular to an engine oil viscosity measurement method for a new energy automobile.
Description
Technical Field
The invention relates to the field of measurement, in particular to a method for measuring the viscosity of engine oil for a new energy automobile.
Background
After the engine oil of the automobile engine is used for a period of time, the viscosity of the engine oil changes due to the mixed impurities and the property change of the engine oil, so that the lubricating capacity of the engine oil is affected, the lubrication among automobile parts is insufficient, and the abrasion is aggravated, so that the related technology for detecting the viscosity of the engine oil in real time is valued.
Chinese patent publication No. CN109653835a discloses a method, a system and an automobile for detecting engine oil viscosity, where the method for detecting engine oil viscosity includes: after the engine is stopped, obtaining: the engine oil injected into the measuring cup with engine oil flows out from the outlet of the measuring cup, and the outflow time is needed for the engine oil to drop from the first liquid level to the second liquid level; judging whether the outflow time is less than a preset time threshold value or not to obtain a judging result, and generating an engine oil viscosity shortage signal under the condition that the judgment is yes, wherein in the application, engine oils with different viscosities are different along with the outflow speed from the outlet of the measuring cup, the required loss time of the engine oil quantity lost in the measuring cup is also different along with the outflow speed of the engine oil from the outlet of the measuring cup, the required loss time of the engine oil quantity lost in the measuring cup is compared with the preset time threshold value or not, whether the outflow time is less than the preset time threshold value or not is judged, and whether the viscosity of the engine oil meets the requirement or not can be determined according to the judging result.
However, the prior art has the following problems,
in the prior art, the viscosity of engine oil is not detected in real time when an electric drive system works, and different influencing factors of the engine oil viscosity under different conditions are not considered, so that the mode of measuring the engine oil viscosity is adjusted, and the detection precision is improved.
Disclosure of Invention
The invention provides a method for measuring the viscosity of engine oil for a new energy automobile, which aims to solve the problems that the viscosity of engine oil is not detected in real time when an electric drive system works in the prior art, and different influencing factors are not considered under different conditions, so that the mode of measuring the viscosity of engine oil is adjusted, and the detection precision is improved, and the method comprises the following steps:
step S1, building an association relation between an input current of an electric energy receiving end of an electronic oil pump and engine oil viscosity based on experimental data, and storing the association relation into a sample database, wherein the experimental data are obtained by measuring the input current of the electric energy receiving end of the electronic oil pump when the electronic oil pump pumps engine oils with different viscosity values;
step S2, a temperature detection unit used for detecting the internal temperature of the electric drive system and a rotation speed detection unit used for detecting the rotation speed of a motor in the electric drive system are arranged in the electric drive system of the automobile, and the running state of the electric drive system is determined based on data detected by the temperature detection unit and the rotation speed detection unit;
s3, when the electric drive system is in a first running state, acquiring real-time input current of an energy supply end of the electronic oil pump, matching the real-time input current with data in the sample database, and determining the engine oil viscosity according to a matching result;
when the electric drive system is in a second running state, acquiring a sound decibel value acquired by a sound acquisition unit arranged on the electric drive system, an engine oil brightness value acquired by an image acquisition unit arranged in a transmission case and a pressure value transmitted by a pressure sensor arranged in an engine oil transmission pipeline, calculating a viscosity influence quantity according to the sound decibel value, the engine oil brightness value and the pressure value, and determining the engine oil viscosity according to the viscosity influence quantity, the wall-attached flow rate of the engine oil transmission pipeline and the flow rate in a pipe;
and S4, acquiring a humidity value detected by a humidity detection unit arranged in the electric drive system, comparing the humidity value with a preset humidity comparison parameter, and judging whether to correct the viscosity influence according to a comparison result.
Further, in the step S2, the data detected by the temperature detection unit and the rotation speed detection unit are obtained and the characterization parameter R is calculated according to the formula (1),
in the formula (1), T represents the internal temperature of the electric drive system, and V represents the motor rotation speed.
Further, in the step S2, the characterizing parameter R is compared with a preset characterizing comparing parameter R0, and the operation state of the electric drive system is determined according to the comparing result, wherein,
under a first comparison condition, determining that the electric drive system is in a first operating state;
under a second comparison condition, determining that the electric drive system is in a second operating state;
the first comparison condition is R < R0, and the second comparison condition is R not less than R0.
Further, in the step S3, when the electric drive system is in the first operation state, a real-time input current of the energy supply end of the electronic oil pump is obtained, the real-time input current is matched with data in the sample database, and the viscosity of the engine oil is determined according to the matching result,
and matching the real-time input currents with the input currents stored in the sample database one by one, and determining the viscosity value associated with the input currents as engine oil viscosity if any one of the input currents stored in the sample database is identical to the real-time input current.
Further, in the step S3, when the electric drive system is in the second operation state, the viscosity influencing amount H is calculated according to the sound decibel value, the engine oil brightness value and the pressure value through the formula (2),
In the formula (2), P represents a pressure value, Q represents an engine oil brightness value, B represents a sound decibel value, P0 represents a preset standard pressure comparison parameter, Q0 represents a preset standard engine oil brightness comparison parameter, and B0 represents a preset standard sound decibel comparison parameter.
Further, in the step S3, a first flow rate sensor is arranged on the inner wall of the engine oil transmission pipeline to measure the adherence flow rate u of the engine oil transmission pipeline, a second flow rate sensor is arranged in the engine oil transmission pipeline through a mounting frame to measure the flow rate y in the engine oil transmission pipeline, and the engine oil viscosity v when the electric drive system is in a second operation state is calculated according to the formula (3),
In the formula (3), τ represents an average value of internal friction resistance per unit area of the preset engine oil, α represents a conversion coefficient, d represents a preset distance value, and ρ represents a preset engine oil density value.
Further, in the step S4, a humidity value C detected by a humidity detecting unit provided in the electric driving system is obtained, the humidity value C is compared with a preset humidity comparison parameter C1, and whether to correct the viscosity influencing amount H is determined according to the comparison result,
under the first humidity comparison result, judging that the viscosity influence quantity H is not required to be corrected;
under the second humidity comparison result, judging that the viscosity influence quantity H needs to be corrected;
the first humidity comparison result is C less than or equal to C1, and the second humidity comparison result is C > C1.
Further, in the step S4, a humidity difference value Δc between the humidity value C and a preset humidity comparison parameter C1 is calculated, the humidity difference value Δc is compared with a preset humidity difference comparison parameter Δc0, and a correction mode for correcting the viscosity influencing amount H is determined according to the comparison result,
the first correction mode is to correct the current viscosity influence amount to a first corrected viscosity influence amount H1 'according to a preset first viscosity correction parameter H1, and set H1' =h+h1;
the second correction mode is to correct the current viscosity influence amount to a second corrected viscosity influence amount H2 'according to a preset second viscosity correction parameter H2, and set H2' =H+h2;
the third correction mode is to correct the current viscosity influence amount to a third corrected viscosity influence amount H3 'according to a preset first viscosity correction parameter H1, and set H3' =H-H1;
the fourth correction mode is to correct the current viscosity influence amount to a fourth corrected viscosity influence amount H4 'according to a preset second viscosity correction parameter H2, and set H4' =H-H2;
the first correction mode needs to meet delta C < 0 and delta C is more than or equal to delta C0, the second correction mode needs to meet delta C < 0 and delta C is more than or equal to delta C0, the third correction mode needs to meet delta C > 0 and delta C is more than or equal to delta C0, and the fourth correction mode needs to meet delta C > 0 and delta C is more than or equal to delta C0, h1 is more than h2 and delta C0 is more than 0.
Further, in the step S3, the engine oil calculated when the electric drive system is in the second operation state is also includedViscosity of the mixture
Comparing the calculated result with a preset viscosity comparison range to judge whether the calculated result is abnormal or not, wherein,
if the engine oil viscosity is
And if the calculated result does not belong to the viscosity comparison range, judging that the calculated result is abnormal.
Further, in the step S1, the input current in the sample database ranges from 3A to 5A.
Compared with the prior art, the method has the advantages that the association relation between the input current of the electric energy receiving end of the electronic oil pump and the engine oil viscosity is built based on experimental data, the sample database is built, when the electric drive system is in the first running state, the real-time input current of the energy supply end of the electronic oil pump is obtained, the real-time input current is matched with data in the sample database, the engine oil viscosity is determined according to the matching result, when the electric drive system is in the second running state, the engine oil viscosity is determined based on the viscosity influence quantity, the adherence flow rate of the engine oil transmission pipeline and the flow rate in the pipe, and the engine oil viscosity real-time measurement method with better characterizability is selected in different states, so that the detection precision and reliability of the engine oil viscosity are improved.
In particular, the invention divides the running state of the electric drive system by calculating the characterization parameter R to characterize the influence degree of the work of the electric drive system on the engine oil, and the influence degree on the engine oil is different under different running states, for example, the temperature of the motor is higher and the rotating speed is faster when the electric drive system is in the first running state, and the viscosity of the engine oil is greatly reduced under the influence of the temperature and the circulation rate, otherwise, different engine oil viscosity detection modes are adopted when the electric drive system is in different states, so as to detect the engine oil viscosity in real time, and the detection precision and reliability of the engine oil viscosity are improved.
In particular, when the electric drive system is in the first running state, because the motor rotation speed and the internal temperature of the electric drive system are lower, the engine oil viscosity does not drop greatly, at this time, because the engine oil viscosity is more viscous, the flow rate acquisition unit is insensitive, but the change of the viscosity can influence the working condition of the electronic oil pump, for example, the load of the electronic oil pump can be increased when the engine oil viscosity rises, and the actual current of the electronic oil pump changes during working, so that the engine oil viscosity value can be represented by the change condition of the actual current, and the engine oil viscosity is detected in real time by the mode, so that the detection precision and reliability of the engine oil viscosity are improved.
In particular, when the electric drive system is in the second running state, the viscosity of the engine oil is greatly reduced due to the influence of temperature and circulation rate, at the moment, the viscosity of the engine oil is in a lower state as a whole, the influence on the working condition of the electronic oil pump after the viscosity is changed is small, but at the moment, the flow rate acquisition unit is sensitive, so that the invention acquires data through each sensor, obtains the viscosity of the engine oil through a specific operation mode, detects the viscosity of the engine oil in real time, and ensures the accuracy of the viscosity detection of the engine oil.
In particular, under the condition of higher humidity, the detection precision of each sensor is influenced, so that the viscosity influence is corrected based on the humidity, and the detection precision and reliability of the engine oil viscosity are improved.
Drawings
Fig. 1 is a schematic diagram of steps of an engine oil viscosity measurement method for a new energy automobile according to an embodiment of the invention.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1, which is a schematic diagram illustrating steps of an oil viscosity measurement method for a new energy automobile according to an embodiment of the invention, the oil viscosity measurement method for the new energy automobile of the invention includes:
step S1, building an association relation between an input current of an electric energy receiving end of an electronic oil pump and engine oil viscosity based on experimental data, and storing the association relation into a sample database, wherein the experimental data are obtained by measuring the input current of the electric energy receiving end of the electronic oil pump when the electronic oil pump pumps engine oils with different viscosity values;
step S2, a temperature detection unit used for detecting the internal temperature of the electric drive system and a rotation speed detection unit used for detecting the rotation speed of a motor in the electric drive system are arranged in the electric drive system of the automobile, and the running state of the electric drive system is determined based on data detected by the temperature detection unit and the rotation speed detection unit;
s3, when the electric drive system is in a first running state, acquiring real-time input current of an energy supply end of the electronic oil pump, matching the real-time input current with data in the sample database, and determining the engine oil viscosity according to a matching result;
when the electric drive system is in a second running state, acquiring a sound decibel value acquired by a sound acquisition unit arranged on the electric drive system, an engine oil brightness value acquired by an image acquisition unit arranged in a transmission case and a pressure value transmitted by a pressure sensor arranged in an engine oil transmission pipeline, calculating a viscosity influence quantity according to the sound decibel value, the engine oil brightness value and the pressure value, and determining the engine oil viscosity according to the viscosity influence quantity, the wall-attached flow rate of the engine oil transmission pipeline and the flow rate in a pipe;
and S4, acquiring a humidity value detected by a humidity detection unit arranged in the electric drive system, comparing the humidity value with a preset humidity comparison parameter, and judging whether to correct the viscosity influence according to a comparison result.
Specifically, the specific forms of the rotation speed detection unit, the temperature detection unit, the humidity detection unit, the pressure sensor and the sound acquisition unit are not limited, and the detection device only needs to be in line with an application scene and meet corresponding detection functions, which are all the prior art, and are not repeated here.
Specifically, the electric driving system of the new energy automobile refers to a power assembly for providing power for the automobile, the core component of the electric driving system is a motor, the specific structure of the electric driving system is not limited in this embodiment, and the electric driving system is in the prior art and will not be described herein.
In particular, the specific form of the image capturing unit is not limited, and may be a video camera or an industrial CCD camera, however, in an embodiment, a preferred mode may be an integrated module of the camera and the processor to obtain the brightness value of the engine oil, and the related algorithm of image processing is not limited in the prior art.
Specifically, in the step S2, the data detected by the temperature detecting unit and the rotation speed detecting unit are obtained and the characterization parameter R is calculated according to the formula (1),
in the formula (1), T represents the internal temperature of the electric drive system, and V represents the motor rotation speed.
Specifically, the operating state of the electric drive system is divided by calculating the characterization parameter R to characterize the influence degree of the operation of the electric drive system on the engine oil, and the influence degree on the engine oil is different under different operating states, for example, the temperature of the motor is higher and the rotating speed is faster when the electric drive system is in a first operating state, and the viscosity of the engine oil is greatly reduced due to the influence of the temperature and the circulation rate, otherwise, different engine oil viscosity detection modes are adopted when the electric drive system is in different states, so that the engine oil viscosity is detected in real time, and the detection precision and reliability of the engine oil viscosity are improved.
Specifically, in the step S2, the characteristic parameter R is compared with a preset characteristic comparison parameter R0, and the operation state of the electric drive system is determined according to the comparison result, wherein,
under a first comparison condition, determining that the electric drive system is in a first operating state;
under a second comparison condition, determining that the electric drive system is in a second operating state;
the first comparison condition is R < R0, the second comparison condition is R more than or equal to R0, R0 is more than or equal to 0 and less than 6000rpm/min, and in practical application, the rotating speed of the motor when the running speed of the new energy automobile is 60Km/h can be used as a characterization comparison parameter R0.
Specifically, in the step S3, when the electric drive system is in the first operating state, a real-time input current of the energy supply end of the electronic oil pump is obtained, the real-time input current is matched with data in the sample database, and the viscosity of the engine oil is determined according to the matching result,
and matching the real-time input currents with the input currents stored in the sample database one by one, and determining the viscosity value associated with the input currents as engine oil viscosity if any one of the input currents stored in the sample database is identical to the real-time input current.
Specifically, when the electric drive system is in the first running state, the motor rotation speed and the internal temperature of the electric drive system are low, the engine oil viscosity is not greatly reduced, at this time, the engine oil viscosity is relatively viscous, and the flow rate acquisition unit is insensitive, however, the change of the viscosity can influence the working condition of the electronic oil pump, for example, the load of the electronic oil pump can be increased when the engine oil viscosity is increased, and the actual current of the electronic oil pump in working is changed, so that the engine oil viscosity value can be represented by the change condition of the actual current, and the engine oil viscosity is detected in real time in the mode, so that the detection precision and reliability of the engine oil viscosity are improved.
Specifically, in the step S3, when the electric drive system is in the second operation state, the viscosity influencing amount H is calculated by the formula (2) according to the sound decibel value, the engine oil brightness value and the pressure value,
In the formula (2), P represents a pressure value, Q represents an engine oil brightness value, B represents a sound decibel value, P0 represents a preset standard pressure comparison parameter, Q0 represents a preset standard engine oil brightness comparison parameter, B0 represents a preset standard sound decibel comparison parameter, 0 is less than 5N,0 is less than 255,0 is less than 0 and less than 120dB, in practical application, the pressure value measured by the pressure sensor when the running speed of the new energy automobile is 60Km/h can be determined to be the preset standard pressure comparison parameter P0, the engine oil brightness value acquired by the image acquisition unit at the moment is determined to be the preset standard engine oil brightness comparison parameter Q0, and the sound decibel value acquired by the sound acquisition unit at the moment is determined to be the preset standard sound decibel comparison parameter B0.
Specifically, in the step S3, a first flow rate sensor is arranged on the inner wall of the engine oil transmission pipeline to measure the adherence flow rate u of the engine oil transmission pipeline, a second flow rate sensor is arranged in the engine oil transmission pipeline through a mounting frame to measure the flow rate y in the engine oil transmission pipeline, and the engine oil viscosity v when the electric drive system is in a second running state is calculated according to the formula (3),
In the formula (3), τ represents an average value of internal friction resistance per unit area of the preset engine oil, α represents a conversion coefficient, d represents a preset distance value, and ρ represents a preset engine oil density value.
Specifically, when the electric drive system is in the second running state, the viscosity of the engine oil is greatly reduced due to the influence of temperature and circulation rate, at the moment, the viscosity of the engine oil is in a lower state as a whole, the influence on the working condition of the electronic oil pump after the viscosity changes is small, but at the moment, the flow rate acquisition unit is sensitive, so that the invention acquires data through each sensor, obtains the viscosity of the engine oil through a specific operation mode, detects the viscosity of the engine oil in real time, and ensures the accuracy of the viscosity detection of the engine oil.
Specifically, in the step S4, a humidity value C detected by a humidity detecting unit provided in the electric drive system is obtained, the humidity value C is compared with a preset humidity comparison parameter C1, and whether to correct the viscosity influencing amount H is determined according to the comparison result, wherein,
under the first humidity comparison result, judging that the viscosity influence quantity H is not required to be corrected;
under the second humidity comparison result, judging that the viscosity influence quantity H needs to be corrected;
the first humidity comparison result is C.ltoreq.C1, the second humidity comparison result is C > C1, 40% < C1 < 80%, and C1 takes 50% in the present embodiment.
Specifically, in the step S4, a humidity difference value Δc between the humidity value C and a preset humidity comparison parameter C1 is calculated, the humidity difference value Δc is compared with a preset humidity difference comparison parameter Δc0, and a correction mode for correcting the viscosity influencing amount H is determined according to the comparison result,
the first correction mode is to correct the current viscosity influence amount to a first corrected viscosity influence amount H1 'according to a preset first viscosity correction parameter H1, and set H1' =h+h1;
the second correction mode is to correct the current viscosity influence amount to a second corrected viscosity influence amount H2 'according to a preset second viscosity correction parameter H2, and set H2' =H+h2;
the third correction mode is to correct the current viscosity influence amount to a third corrected viscosity influence amount H3 'according to a preset first viscosity correction parameter H1, and set H3' =H-H1;
the fourth correction mode is to correct the current viscosity influence amount to a fourth corrected viscosity influence amount H4 'according to a preset second viscosity correction parameter H2, and set H4' =H-H2;
the first correction method needs to satisfy Δc < 0 and |Δc|ΔΣ0, the second correction method needs to satisfy Δc < 0 and |Δc| < Δc0, the third correction method needs to satisfy Δc > 0 and |Δc|ΔΣ0, the fourth correction method needs to satisfy Δc > 0 and |Δc| < Δc0,0.7 > h1 > h2 > 0, Δc0 > 0, and Δc0=0.2xc1 is set in this embodiment.
Specifically, under the condition of high humidity, the detection precision of each sensor is influenced, so that the viscosity influence is corrected based on the humidity, and the detection precision and reliability of the engine oil viscosity are improved.
Specifically, in step S3, the method further includes the step of calculating the viscosity of the engine oil when the electric drive system is in the second operation state
Comparing the calculated result with a preset viscosity comparison range to judge whether the calculated result is abnormal or not, wherein,
if the engine oil viscosity is
And if the calculated result does not belong to the viscosity comparison range, judging that the calculated result is abnormal.
Specifically, in the step S1, the input current in the sample database ranges from 3A to 5A.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
Claims (8)
1. The method for measuring the viscosity of the engine oil for the new energy automobile is characterized by comprising the following steps of:
step S1, building an association relation between an input current of an electric energy receiving end of an electronic oil pump and engine oil viscosity based on experimental data, and storing the association relation into a sample database, wherein the experimental data are obtained by measuring the input current of the electric energy receiving end of the electronic oil pump when the electronic oil pump pumps engine oils with different viscosity values;
step S2, a temperature detection unit used for detecting the internal temperature of the electric drive system and a rotation speed detection unit used for detecting the rotation speed of a motor in the electric drive system are arranged in the electric drive system of the automobile, and the running state of the electric drive system is determined based on data detected by the temperature detection unit and the rotation speed detection unit;
s3, when the electric drive system is in a first running state, acquiring real-time input current of an energy supply end of the electronic oil pump, matching the real-time input current with data in the sample database, and determining the engine oil viscosity according to a matching result;
when the electric drive system is in a second running state, acquiring a sound decibel value acquired by a sound acquisition unit arranged on the electric drive system, an engine oil brightness value acquired by an image acquisition unit arranged in a transmission case and a pressure value transmitted by a pressure sensor arranged in an engine oil transmission pipeline, calculating a viscosity influence quantity according to the sound decibel value, the engine oil brightness value and the pressure value, and determining the engine oil viscosity according to the viscosity influence quantity, the wall-attached flow rate of the engine oil transmission pipeline and the flow rate in a pipe;
s4, acquiring a humidity value detected by a humidity detection unit arranged in the electric drive system, comparing the humidity value with a preset humidity comparison parameter, and judging whether to correct the viscosity influence according to a comparison result;
in the step S2, the data detected by the temperature detection unit and the rotation speed detection unit are obtained, and the characterization parameter R is calculated according to the formula (1),
in the formula (1), T represents the internal temperature of the electric drive system, and V represents the motor rotation speed;
in the step S2, the characteristic parameter R is compared with a preset characteristic comparison parameter R0, and the operation state of the electric drive system is determined according to the comparison result,
under a first comparison condition, determining that the electric drive system is in a first operating state;
under a second comparison condition, determining that the electric drive system is in a second operating state;
the first comparison condition is R < R0, and the second comparison condition is R not less than R0.
2. The method for measuring engine oil viscosity for a new energy vehicle according to claim 1, wherein in the step S3, when the electric drive system is in the first operating state, a real-time input current of the power supply end of the electronic oil pump is obtained and matched with the data in the sample database, and the engine oil viscosity is determined according to the matching result,
and matching the real-time input currents with the input currents stored in the sample database one by one, and determining the viscosity value associated with the input currents as engine oil viscosity if any one of the input currents stored in the sample database is identical to the real-time input current.
3. The method for measuring the viscosity of engine oil for a new energy vehicle according to claim 1, wherein in the step S3, the viscosity influencing amount H is calculated by the formula (2) based on the sound decibel value, the engine oil brightness value and the pressure value when the electric drive system is in the second operation state,
In the formula (2), P represents a pressure value, Q represents an engine oil brightness value, B represents a sound decibel value, P0 represents a preset standard pressure comparison parameter, Q0 represents a preset standard engine oil brightness comparison parameter, and B0 represents a preset standard sound decibel comparison parameter.
4. The method for measuring the viscosity of engine oil for a new energy automobile according to claim 3, wherein,
in the step S3, a first flow rate sensor is arranged on the inner wall of the engine oil transmission pipeline to measure the adherence flow rate u of the engine oil transmission pipeline, a second flow rate sensor is arranged in the engine oil transmission pipeline through a mounting frame to measure the flow rate y in the engine oil transmission pipeline, the engine oil viscosity v when the electric drive system is in a second running state is calculated according to a formula (3),
v
formula (3)
In the formula (3), τ represents an average value of internal friction resistance per unit area of the preset engine oil, α represents a conversion coefficient, d represents a preset distance value, and ρ represents a preset engine oil density value.
5. The method for measuring the viscosity of engine oil for a new energy vehicle according to claim 4, wherein in the step S4, a humidity value C detected by a humidity detecting unit provided in the electric drive system is obtained, the humidity value C is compared with a preset humidity comparison parameter C1, and whether the viscosity affecting amount H is corrected is determined based on the comparison result, wherein,
under the first humidity comparison result, judging that the viscosity influence quantity H is not required to be corrected;
under the second humidity comparison result, judging that the viscosity influence quantity H needs to be corrected;
the first humidity comparison result is C less than or equal to C1, and the second humidity comparison result is C > C1.
6. The method for measuring engine oil viscosity for a new energy vehicle according to claim 5, wherein in the step S4, a humidity difference Δc between the humidity value C and a preset humidity comparison parameter C1 is calculated, the humidity difference Δc is compared with a preset humidity difference comparison parameter Δc0, and a correction mode for correcting the viscosity influencing amount H is determined according to the comparison result,
the first correction mode is to correct the current viscosity influence amount to a first corrected viscosity influence amount H1 'according to a preset first viscosity correction parameter H1, and set H1' =h+h1;
the second correction mode is to correct the current viscosity influence amount to a second corrected viscosity influence amount H2 'according to a preset second viscosity correction parameter H2, and set H2' =H+h2;
the third correction mode is to correct the current viscosity influence amount to a third corrected viscosity influence amount H3 'according to a preset first viscosity correction parameter H1, and set H3' =H-H1;
the fourth correction mode is to correct the current viscosity influence amount to a fourth corrected viscosity influence amount H4 'according to a preset second viscosity correction parameter H2, and set H4' =H-H2;
the first correction mode needs to meet delta C < 0 and delta C is more than or equal to delta C0, the second correction mode needs to meet delta C < 0 and delta C is more than or equal to delta C0, the third correction mode needs to meet delta C > 0 and delta C is more than or equal to delta C0, and the fourth correction mode needs to meet delta C > 0 and delta C is more than or equal to delta C0, h1 is more than h2 and delta C0 is more than 0.
7. The method for measuring the viscosity of engine oil for a new energy vehicle according to claim 1, wherein in the step S3, the method further comprises the step of calculating the viscosity of engine oil when the electric drive system is in the second operation state
Comparing the calculated result with a preset viscosity comparison range to judge whether the calculated result is abnormal or not, wherein,
if the engine oil viscosity is
And if the calculated result does not belong to the viscosity comparison range, judging that the calculated result is abnormal.
8. The method for measuring the viscosity of engine oil for a new energy vehicle according to claim 1, wherein in the step S1, the input current in the sample database ranges from 3A to 5A.
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