CN113074798A - System and method for detecting oil level of engine oil based on ultrasonic waves - Google Patents
System and method for detecting oil level of engine oil based on ultrasonic waves Download PDFInfo
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- 239000010705 motor oil Substances 0.000 title claims abstract description 190
- 239000003921 oil Substances 0.000 title claims abstract description 153
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000012937 correction Methods 0.000 claims abstract description 58
- 238000012545 processing Methods 0.000 claims abstract description 56
- 238000005259 measurement Methods 0.000 claims abstract description 49
- 238000001914 filtration Methods 0.000 claims description 24
- 230000001133 acceleration Effects 0.000 claims description 11
- 239000002199 base oil Substances 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 7
- 101150008122 Bcan gene Proteins 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 3
- 230000005856 abnormality Effects 0.000 claims 1
- 239000010721 machine oil Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000005070 sampling Methods 0.000 description 6
- 238000000265 homogenisation Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 102100032312 Brevican core protein Human genes 0.000 description 1
- 101000731086 Homo sapiens Brevican core protein Proteins 0.000 description 1
- 101000595182 Homo sapiens Podocan Proteins 0.000 description 1
- 102100036036 Podocan Human genes 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2962—Measuring transit time of reflected waves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/10—Indicating devices; Other safety devices
- F01M11/12—Indicating devices; Other safety devices concerning lubricant level
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Abstract
The invention discloses a method for detecting the oil level of engine oil based on ultrasonic waves, which comprises the following steps: step S10, after the automobile is powered on, controlling the electronic engine oil sensor to send ultrasonic waves into the engine oil measuring pipe and receive echo waves; step S11, calculating the oil level in the measuring tube according to the propagation time of the ultrasonic wave received and transmitted by the electronic oil sensor; step S12, determining the current oil quantity of the base engine according to the current measured oil level through the pre-calibrated measurement reference parameters of the base rack; step S13, identifying the working condition of the current vehicle, respectively using the processing strategy corresponding to the working condition of the current vehicle to process and correct the current basic engine oil quantity, and finally outputting a stable actual engine oil quantity signal; and step S14, sending the actual engine oil quantity signal to an instrument for displaying and reminding. The invention also discloses a corresponding system. By implementing the invention, the engine oil quantity can be detected under various working conditions, and corresponding correction is carried out, so that the measuring accuracy and the application scene are improved.
Description
Technical Field
The invention relates to engine oil level detection, in particular to a system and a method for detecting the engine oil level based on ultrasonic waves.
Background
The engine oil is used as a main medium for lubricating and radiating the engine and plays an important role when the engine works. As engine technology develops, more and more components are required to be lubricated, cooled or driven by oil (e.g., superchargers, EGR, variable oil pumps, etc.). Insufficient oil may cause the engine, transmission to be lubricated insufficiently, wear, or otherwise fail to drive components driven by the oil.
The traditional fuel oil automobile, the new energy automobile and the like adopt an engine oil medium to lubricate, radiate or drive mechanical parts, most of domestic automobile models in the market at present only measure the engine oil position in an oil pan through an oil rule, and a small part of domestic automobile models and most of European automobile models gradually adopt an electronic oil rule to measure the engine oil amount.
However, the existing electronic dipstick measurement has the following disadvantages: can only be displayed during the running of the vehicle; the updating period of the measured data is long, and the real-time performance is poor; the measurement result is badly corrected, and the numerical value is easy to jump.
Disclosure of Invention
The invention aims to provide a system and a method for detecting the oil level of engine oil based on ultrasonic waves. The engine oil quantity detection can be carried out under various working conditions, and corresponding correction is carried out, so that the measuring accuracy and the application scene are improved.
In order to solve the above technical problem, as an aspect of the present invention, there is provided a method for detecting an oil level of engine oil based on ultrasonic waves, comprising the steps of:
step S10, after the automobile is powered on, controlling the electronic engine oil sensor to send ultrasonic waves into the engine oil measuring pipe and receive echo waves;
step S11, calculating the oil level in the measuring tube according to the propagation time of the ultrasonic wave received and transmitted by the electronic oil sensor;
step S12, determining the current oil quantity of the base engine according to the current measured oil level through the pre-calibrated measurement reference parameters of the base rack;
step S13, identifying the working condition of the current vehicle, respectively using the processing strategy corresponding to the working condition of the current vehicle to process and correct the current basic engine oil quantity, and finally outputting a stable actual engine oil quantity signal;
and step S14, sending the actual engine oil quantity signal to be forwarded to the meter through the gateway for displaying and reminding.
Wherein, before the step S10, the method further comprises the steps of:
determining the minimum oil quantity P of various engine oils according to the calibration of the rack and the calibration of the whole vehicleminAnd the maximum oil amount PmaxAccording to the measurement reference parameters obtained by different engine oil filling quantities at different rotating speeds, and forming a corresponding measurement reference parameter table, wherein the measurement reference parameters comprise: base oil level data, reflux time, and temperature correction parameters.
Wherein, the step S11 specifically includes:
the engine controller obtains the oil level S in the oil measuring pipe according to the following formula:
S＝v*Δt/2
wherein S is the currently measured oil level of the engine oil, v is the propagation speed of the ultrasonic wave in the liquid medium, and delta t is the propagation time of the ultrasonic wave in the engine oil measuring pipe.
Wherein, the step S12 specifically includes:
the engine controller retrieves and obtains the current base engine oil quantity P corresponding to the current engine oil level from the measurement reference parameter table according to the measured current engine oil level and the rotating speed informationcurrent。
Wherein the step S13 further includes:
step S130, identifying the working condition of the current vehicle, and obtaining a processing strategy corresponding to the working condition of the current vehicle;
step S131, using the processing strategy to process and correct the current basic engine oil amount, and finally outputting a stable actual engine oil amount signal, specifically including:
when the current working condition of the vehicle is the engine standing working condition, short-time filtering is carried out on the current base engine oil quantity signal;
when the current working condition of the vehicle is the original running working condition of the engine, long-time filtering and temperature correction are carried out on the current basic engine oil quantity signal;
when the current working condition of the vehicle is the vehicle running working condition, long-time filtering processing, temperature correction and acceleration correction are carried out on the current basic engine oil quantity signal;
and when the current working condition of the vehicle is the engine flameout working condition, performing backflow correction on the current base engine oil quantity according to the measurement reference parameter table.
Wherein the step S14 further includes:
the engine controller obtains a grade signal L corresponding to the actual engine oil quantity signaloil；
According to a preset oil quantity grade-hysteresis interval comparison table, the grade signal L is comparedoilPerforming hysteresis treatment; and generates corresponding engine oil quantity abnormity warning information Loilwarning；
The level signal LoilAnd abnormal engine oil quantity warning information LoilwarningAnd sending an engine oil quantity grade signal to the gateway through the Pcan bus, and sending the engine oil quantity grade signal to the instrument through the Bcan bus by the gateway for interface display or reminding of the instrument.
Correspondingly, the invention also provides a system for detecting the oil level of the engine oil based on ultrasonic waves, which comprises an engine controller, and an electronic engine oil sensor, an engine rotating speed sensor and a meter which are communicated with the engine controller; wherein: the engine controller further includes:
the measurement control unit is used for controlling the electronic engine oil sensor to send ultrasonic waves to the engine oil measuring pipe and receive echo waves after the automobile is powered on;
the calculation unit is used for calculating the oil level of the engine oil in the measuring pipe according to the propagation time of the ultrasonic wave received and transmitted by the electronic engine oil sensor;
the base engine oil quantity determining unit is used for determining the current base engine oil quantity according to the current measured oil level through a measurement reference parameter pre-calibrated by the base rack;
the correction processing unit is used for identifying the working condition of the current vehicle, respectively processing and correcting the current basic engine oil quantity by using a processing strategy corresponding to the working condition of the current vehicle, and finally outputting a stable actual engine oil quantity signal;
and the sending processing unit is used for sending the actual engine oil quantity signal to the instrument through the gateway for displaying and reminding.
Wherein, further include:
a measurement reference parameter table obtaining unit for determining the minimum oil quantity P of each engine oil according to the bench calibration and the whole vehicle calibrationminAnd the maximum oil amount PmaxAccording to the measurement reference parameters obtained by different engine oil filling quantities at different rotating speeds, and forming a corresponding measurement reference parameter table, wherein the measurement reference parameters comprise: at least one of the base oil level data, the return time, and the temperature correction parameter.
Wherein the calculation unit calculates and obtains the oil level of the oil in the oil measuring pipe according to the following formula:
S＝v*Δt/2
wherein S is the currently measured oil level of the engine oil, v is the propagation speed of the ultrasonic wave in the liquid medium, and delta t is the propagation time of the ultrasonic wave in the engine oil measuring pipe.
The base engine oil amount determining unit is specifically configured to obtain a current base engine oil amount P corresponding to the current engine oil level from the measurement reference parameter table according to the measured current engine oil level and the information on the rotating speedcurrent。
Wherein the correction processing unit further includes:
the working condition identification unit is used for identifying the working condition of the current vehicle and obtaining a processing strategy corresponding to the working condition of the current vehicle;
the correction subunit is configured to process and correct the current basic engine oil amount by using the processing strategy, and finally output a stable actual engine oil amount signal, and specifically includes:
when the current working condition of the vehicle is the engine standing working condition, short-time filtering is carried out on the current base engine oil quantity signal;
when the current working condition of the vehicle is the original running working condition of the engine, long-time filtering and temperature correction are carried out on the current basic engine oil quantity signal;
when the current working condition of the vehicle is the vehicle running working condition, long-time filtering processing, temperature correction and acceleration correction are carried out on the current basic engine oil quantity signal;
and when the current working condition of the vehicle is the engine flameout working condition, performing backflow correction on the current base engine oil quantity according to the measurement reference parameter table.
Wherein the transmission processing unit further includes:
a grade signal obtaining unit for obtaining grade signal L corresponding to the actual engine oil quantity signal by an engine controlleroil；
A hysteresis processing unit for processing the level signal L according to a preset oil level-hysteresis interval comparison tableoilPerforming hysteresis treatment; and generates corresponding engine oil quantity abnormity warning information Loilwarning；
A transmitting unit for transmitting the level signal LoilAnd abnormal engine oil quantity warning information LoilwarningAnd sending an engine oil quantity grade signal to the gateway through the Pcan bus, and sending the engine oil quantity grade signal to the instrument through the Bcan bus by the gateway for interface display or reminding of the instrument.
By implementing the embodiment of the invention, the invention has the following beneficial effects:
by implementing the invention, the defect that the measuring steps of the oil level gauge of the traditional machinery are complicated can be avoided, the actual oil quantity can be accurately fed back under different working conditions, and the real-time measured oil quantity data can be sent to an instrument for display;
by the aid of the method, the engine oil position can be measured under the static working condition of the vehicle, and the engine oil level can be provided in real time; temperature correction, backflow correction, rotating speed correction and vehicle speed correction are respectively carried out through data processing strategies under different working conditions, so that the monitored engine oil position is matched with the actual engine oil position, the condition that a display interface fluctuates frequently is avoided, the electronic oil rule measurement is suitable for all working conditions, and the measurement accuracy is improved;
meanwhile, the automobile driver can visually observe the oil amount (oil position) through man-machine equipment; when the situations of excessive engine oil consumption or leakage of a pipeline occur, the system can accurately identify and prompt a user through an instrument, so that the damage to an engine or other mechanical parts is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating one embodiment of a method for detecting an oil level of engine oil based on ultrasonic waves according to the present invention;
FIG. 2 is a schematic diagram of the calculation involved in FIG. 1;
FIG. 3 is a more detailed flow chart of step S13 in FIG. 1;
FIG. 4 is a schematic view of the hysteresis processing involved in FIG. 1;
FIG. 5 is a more detailed schematic step diagram of one embodiment of a method of detecting oil level based on ultrasonic waves provided by the present invention;
FIG. 6 is a schematic structural diagram of an embodiment of a system for detecting an oil level based on ultrasonic waves according to the present invention;
FIG. 7 is a schematic block diagram of the engine controller of FIG. 6;
fig. 8 is a schematic structural view of the correction processing unit in fig. 6;
fig. 9 is a schematic diagram of the structure of the transmission processing unit in fig. 6.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Referring to fig. 1, a main flow chart of an embodiment of a method for detecting an oil level of engine oil based on ultrasonic waves according to the present invention is shown; as shown in fig. 2 to 4. In this embodiment, the method for detecting the oil level of the engine oil based on the ultrasonic wave includes the following steps:
step S10, after the automobile is powered on, controlling the electronic engine oil sensor to send ultrasonic waves into the engine oil measuring pipe and receive echo waves; receiving the echo by the controller according to the reflection and refraction characteristics of the ultrasonic waves between different medium interfaces;
step S11, calculating the oil level in the measuring tube according to the propagation time of the ultrasonic wave received and transmitted by the electronic oil sensor;
step S12, determining the current oil quantity of the base engine according to the current measured oil level through the pre-calibrated measurement reference parameters of the base rack;
step S13, identifying the working condition of the current vehicle, respectively using the processing strategy corresponding to the working condition of the current vehicle to process and correct the current basic engine oil quantity, and finally outputting a stable actual engine oil quantity signal;
and step S14, sending the actual engine oil quantity signal to be forwarded to the meter through the gateway for displaying and reminding.
The respective steps of the embodiment of the present invention are described in detail below.
It is understood that, before the step S10, the method further includes the steps of:
through calibration of a rack and calibration of a whole vehicle, measurement reference parameters of various types of engine oil obtained at different rotating speeds according to different engine oil filling quantities between the lowest oil quantity Pmin and the highest oil quantity Pmax are determined, and a corresponding measurement reference parameter table is formed, wherein the measurement reference parameters comprise: base oil level data, reflux time, and temperature correction parameters. The measuring reference parameters specifically include: the device comprises a basic rack oil level data table, a temperature correction coefficient table and a backflow correction coefficient table.
Specifically, in one example, calibration tests are carried out through a bench and a whole vehicle under the conditions that the engine runs at different rotating speeds and oil temperatures according to different oil filling amounts. The base stand oil level data in table 1 and the temperature correction coefficient in table 2 were obtained by adding 0.5L of the lowest oil charge Pmin until the highest oil charge Pmax was reached and operating the stands at 700rpm, 1000rpm, 2000rpm … … 6000rpm, respectively.
Table 1 basic rack oil level data table
TABLE 2 temperature correction coefficient Table
When the engine is operated to be flamed out, part of engine oil can enter the oil passage and does not return to the oil pan, and the oil quantity of the oil pan is smaller than the actual oil quantity. The amount of engine oil after the dynamic shift to the static condition needs to be corrected by the backflow correction factor of table 3.
TABLE 3 coefficient of reflow correction
As shown in fig. 2, the propagation path of the ultrasonic wave in the engine oil measuring pipe can be seen, so that the step S11 may specifically include:
the engine controller obtains the oil level S in the oil measuring pipe according to the following formula:
S＝v*Δt/2
wherein S is the currently measured oil level of the engine oil, v is the propagation speed of the ultrasonic wave in the liquid medium, and delta t is the propagation time of the ultrasonic wave in the engine oil measuring pipe.
Wherein, the step S12 specifically includes:
an engine controller according toThe measured current oil level and the rotating speed information are searched from the measurement reference parameter table to obtain the current base oil quantity P corresponding to the current oil levelcurrent。
Wherein the step S13 further includes:
step S130, identifying the working condition of the current vehicle, and obtaining a processing strategy corresponding to the working condition of the current vehicle;
step S131, using the processing strategy to process and correct the current basic engine oil amount, and finally outputting a stable actual engine oil amount signal, specifically including:
when the current working condition of the vehicle is the engine standing working condition, the signal requirement real-time performance under the working condition is high, and the real-time display is mainly provided for users or maintenance personnel to maintain and add engine oil. Under the working condition, only short-time filtering is carried out on the current basic engine oil quantity signal, and the filtering time is 10 s;
when the current working condition of the vehicle is the working condition of the original running of the engine, the signal instantaneity is low under the working condition, the oil quantity in the oil pan is reduced and fluctuates due to the fact that engine oil is sucked into an oil duct when the engine runs, long-time filtering and temperature correction need to be carried out on the current basic engine oil quantity signal, wherein the filtering mode carries out homogenization processing according to effective sampling signals in 3600s, correction is carried out according to the temperature, and specifically the corresponding coefficients in the table 2 are obtained and multiplied;
when the current working condition of the vehicle is the vehicle driving working condition, the engine oil in the oil pan fluctuates violently due to longitudinal and transverse acceleration during the vehicle driving, long-time filtering processing, temperature correction and acceleration correction are required to be carried out on the current basic engine oil quantity signal, the filtering mode carries out homogenization processing and temperature coefficient correction according to effective sampling signals in 3600s, wherein the signal effectiveness is judged according to an acceleration threshold value, and the sampling signals at the moment are invalidated when the acceleration exceeds a specified value;
when the current working condition of the vehicle is an engine flameout working condition, part of engine oil is still in the oil duct, so the current base engine oil quantity is subjected to backflow correction according to the measurement reference parameter table, and specifically, the coefficient in the table 3 is obtained to be multiplied by the current base engine oil quantity.
Wherein the step S14 further includes:
the engine controller obtains a grade signal L corresponding to the actual engine oil quantity signaloil；
According to a preset oil quantity grade-hysteresis interval comparison table, the grade signal L is comparedoilPerforming hysteresis treatment; and generates corresponding engine oil quantity abnormity warning information Loilwarning；
The level signal LoilAnd abnormal engine oil quantity warning information LoilwarningAnd sending an engine oil quantity grade signal to the gateway through the Pcan bus, and sending the engine oil quantity grade signal to the instrument through the Bcan bus by the gateway for interface display or reminding of the instrument.
Table 4 below shows a fuel level-hysteresis interval chart;
| oil level (oil level) | Upper back stagnation | Lower back stagnation |
| ≥Pmax | - | P9，P10 |
| L4 | P9，P10 | P7，P8 |
| L3 | P7，P8 | P5，P6 |
| L2 | P5，P6 | P3，P4 |
| L1 | P3，P4 | P1，P2 |
| ≤Pmin | P1，P2 | - |
This can be understood together with the schematic diagram of the hysteresis processing shown in fig. 4.
In some embodiments, the data sent to the meter by the engine controller includes an oil level signal and an oil anomaly warning message. The engine oil level signal is used to display the actual engine oil level signal obtained in step S13, but is displayed in a section. Specifically, when the meter is displayed by using square bars with different colors, for example, when the level signal is low, the scale signal can be represented by a yellow square bar, and when the level signal is L1-L4, the scale signal can be represented by a green square bar; the level signal is max, which is indicated by a red bar. Table 5 below shows a data structure representation of a machine oil level signal.
TABLE 5 engine oil level (quantity) grade signal
And the engine oil abnormity warning information is used for prompting the conditions of low oil quantity, high oil quantity, unavailability and the like. The following table 6 shows a data structure schematic of the warning information of abnormal oil quantity of the engine oil.
It can be understood that when the ignition switch of the vehicle is turned ON, the system for detecting the oil level of the engine oil based ON the ultrasonic waves starts to work by electrifying, and when the system starts to work, the engine controller can firstly send an oil quantity signal memorized in the previous driving cycle to the instrument for displaying, simultaneously identify the working condition of the current vehicle, adopt different processing strategies according to the working condition, obtain a real-time actual oil quantity signal and then send the real-time actual oil quantity signal to the instrument for displaying.
Further, the present invention may be understood with reference to the more detailed steps shown in FIG. 5. Each of these steps is described in detail as it is referred to above.
Accordingly, as shown in fig. 5, it is a schematic structural diagram of an embodiment of a system for detecting an oil level based on ultrasonic waves according to the present invention, and is also shown in fig. 6 to 9. In the embodiment, the system for detecting the oil level of the engine oil based on the ultrasonic wave comprises an engine controller 1, an electronic oil sensor 2, an engine rotating speed sensor 3 and a meter 4, wherein the electronic oil sensor 2 is communicated with the engine controller 1; the motor oil sensor 2 is arranged at the bottom of an oil measuring pipe 5, and the oil measuring pipe 5 is arranged in an oil tank 6; a gateway 7 is also arranged between the engine controller 1 and the instrument 4, the engine controller 1 and the gateway 7 are connected through a PCAN bus, and the gateway 7 and the instrument 4 are connected through a BCAN bus;
further, the engine controller 1 further includes:
the measurement control unit 10 is used for controlling the electronic engine oil sensor 2 to send ultrasonic waves into the engine oil measuring pipe 5 and receive echo waves after the automobile is powered on;
a calculation unit 11, for calculating the oil level in the oil measuring tube 5 according to the propagation time of the ultrasonic wave transmitted and received by the electronic oil sensor 2;
a base machine oil amount determination unit 12 for determining a current base machine oil amount from a measurement reference parameter pre-calibrated by the base stand according to a current measured machine oil level;
the correction processing unit 13 is configured to identify a current working condition of the vehicle, process and correct the current basic engine oil amount by using a processing strategy corresponding to the current working condition of the vehicle, and finally output a stable actual engine oil amount signal;
and the sending processing unit 14 is used for sending the actual engine oil quantity signal to the instrument 4 through the gateway 7 for displaying and reminding.
Wherein, further include:
a measurement reference parameter table obtaining unit 15 for determining the minimum oil quantity P of each engine oil according to the bench calibration and the whole vehicle calibrationminAnd the maximum oil amount PmaxAccording to the measurement reference parameters obtained by different engine oil filling quantities at different rotating speeds, and forming a corresponding measurement reference parameter table, wherein the measurement reference parameters comprise: at least one of the base oil level data, the return time, and the temperature correction parameter.
Wherein, the calculation unit 11 obtains the oil level in the oil measuring pipe according to the following formula:
S＝v*Δt/2
wherein S is the currently measured oil level of the engine oil, v is the propagation speed of the ultrasonic wave in the liquid medium, and delta t is the propagation time of the ultrasonic wave in the engine oil measuring pipe.
The base machine oil quantity determining unit 12 is specifically configured to obtain a current base machine oil quantity P corresponding to the current machine oil level from the measurement reference parameter table according to the measured current machine oil level and the rotation speed informationcurrent。
Wherein the correction processing unit 13 further includes:
the working condition identification unit 130 is configured to identify a working condition of the current vehicle and obtain a processing strategy corresponding to the working condition of the current vehicle;
the correcting subunit 131 is configured to process and correct the current base engine oil amount using the processing strategy, and finally output a stable actual engine oil amount signal;
the processing strategies corresponding to different working conditions specifically include:
when the current working condition of the vehicle is the engine standing working condition, short-time filtering is carried out on the current basic engine oil quantity signal, and the filtering time is 10 s;
when the current working condition of the vehicle is the in-situ operation working condition of the engine, long-time filtering and temperature correction are carried out on the current basic engine oil quantity signal, wherein the filtering mode carries out homogenization treatment according to effective sampling signals within 3600s, and correction is carried out according to the temperature;
when the current working condition of the vehicle is the vehicle running working condition and the vehicle runs, carrying out long-time filtering processing, temperature correction and acceleration correction on the current basic engine oil quantity signal, carrying out homogenization processing and temperature coefficient correction in a filtering mode according to effective sampling signals in 3600s, wherein the signal effectiveness is judged according to an acceleration threshold value, and the sampling signals at the moment are invalidated when the acceleration exceeds a specified value;
and when the current working condition of the vehicle is the engine flameout working condition, performing backflow correction on the current base engine oil quantity according to the measurement reference parameter table.
Wherein, the sending processing unit 14 further includes:
a level signal obtaining unit 140 for the engine controller to obtain a level signal L corresponding to the actual oil amount signaloil(ii) a It can be understood that different levels of signal L need to be displayed for different amounts of engine oiloil；
A hysteresis processing unit 141 for processing the level signal L according to a preset oil level-hysteresis interval comparison tableoilPerforming hysteresis treatment; and generates corresponding engine oil quantity abnormity warning information Loilwarning；
A transmitting unit 142 for transmitting the level signal LoilAnd abnormal engine oil quantity warning information LoilwarningAnd sending an engine oil quantity grade signal to the gateway through the Pcan bus, and sending the engine oil quantity grade signal to the instrument through the Bcan bus by the gateway for interface display or reminding of the instrument.
For more details, reference may be made to the foregoing description of fig. 1 to 5, which is not repeated herein.
By implementing the embodiment of the invention, the invention has the following beneficial effects:
by implementing the invention, the defect that the measuring steps of the oil level gauge of the traditional machinery are complicated can be avoided, the actual oil quantity can be accurately fed back under different working conditions, and the real-time measured oil quantity data can be sent to an instrument for display;
by the aid of the method, the engine oil position can be measured under the static working condition of the vehicle, and the engine oil level can be provided in real time; temperature correction, backflow correction, rotating speed correction and vehicle speed correction are respectively carried out through data processing strategies under different working conditions, so that the monitored engine oil position is matched with the actual engine oil position, the condition that a display interface fluctuates frequently is avoided, the electronic oil rule measurement is suitable for all working conditions, and the measurement accuracy is improved;
meanwhile, the automobile driver can visually observe the oil amount (oil position) through man-machine equipment; when the situations of excessive engine oil consumption or leakage of a pipeline occur, the system can accurately identify and prompt a user through an instrument, so that the damage to an engine or other mechanical parts is avoided.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (12)
1. A method for detecting the oil level of engine oil based on ultrasonic waves is characterized by comprising the following steps:
step S10, after the automobile is powered on, controlling the electronic engine oil sensor to send ultrasonic waves into the engine oil measuring pipe and receive echo waves;
step S11, calculating the oil level in the measuring tube according to the propagation time of the ultrasonic wave received and transmitted by the electronic oil sensor;
step S12, determining the current oil quantity of the base engine according to the current measured oil level through the pre-calibrated measurement reference parameters of the base rack;
step S13, identifying the working condition of the current vehicle, respectively using the processing strategy corresponding to the working condition of the current vehicle to process and correct the current basic engine oil quantity, and finally outputting a stable actual engine oil quantity signal;
and step S14, sending the actual engine oil quantity signal to an instrument for displaying and reminding.
2. The method of claim 1, further comprising, before the step S10, the step of:
determining the minimum oil quantity P of various engine oils according to the calibration of the rack and the calibration of the whole vehicleminAnd the maximum oil amount PmaxAccording to the measurement reference parameters obtained by different engine oil filling quantities at different rotating speeds, and forming a corresponding measurement reference parameter table, wherein the measurement reference parameters comprise: base oil level data, reflux time, and temperature correction parameters.
3. The method according to claim 2, wherein the step S11 specifically includes:
the engine controller obtains the oil level S in the oil measuring pipe according to the following formula:
S＝v*Δt/2
wherein S is the currently measured oil level of the engine oil, v is the propagation speed of the ultrasonic wave in the liquid medium, and delta t is the propagation time of the ultrasonic wave in the engine oil measuring pipe.
4. The method according to claim 3, wherein the step S12 specifically includes:
the engine controller retrieves and obtains the current base engine oil quantity P corresponding to the current engine oil level from the measurement reference parameter table according to the measured current engine oil level and the rotating speed informationcurrent。
5. The method of claim 4, wherein the step S13 further comprises:
step S130, identifying the working condition of the current vehicle, and obtaining a processing strategy corresponding to the working condition of the current vehicle;
step S131, using the processing strategy to process and correct the current basic engine oil amount, and finally outputting a stable actual engine oil amount signal, specifically including:
when the current working condition of the vehicle is the engine standing working condition, short-time filtering is carried out on the current base engine oil quantity signal;
when the current working condition of the vehicle is the original running working condition of the engine, long-time filtering and temperature correction are carried out on the current basic engine oil quantity signal;
when the current working condition of the vehicle is the vehicle running working condition, long-time filtering processing, temperature correction and acceleration correction are carried out on the current basic engine oil quantity signal;
and when the current working condition of the vehicle is the engine flameout working condition, performing backflow correction on the current base engine oil quantity according to the measurement reference parameter table.
6. The method of claim 5, wherein the step S14 further comprises:
the engine controller obtains a grade signal L corresponding to the actual engine oil quantity signaloil；
According to a preset oil quantity grade-hysteresis interval comparison table, the grade signal L is comparedoilPerforming hysteresis treatment; and generates corresponding engine oil quantity abnormity warning information Loilwarning；
The level signal LoilAnd engine oilOil quantity abnormality warning information LoilwarningAnd sending an engine oil quantity grade signal to the gateway through the Pcan bus, and sending the engine oil quantity grade signal to the instrument through the Bcan bus by the gateway for interface display or reminding of the instrument.
7. A system for detecting the oil level of engine oil based on ultrasonic waves is characterized by comprising an engine controller, an electronic engine oil sensor, an engine rotating speed sensor and an instrument, wherein the electronic engine oil sensor, the engine rotating speed sensor and the instrument are communicated with the engine controller; wherein: the engine controller further includes:
the measurement control unit is used for controlling the electronic engine oil sensor to send ultrasonic waves to the engine oil measuring pipe and receive echo waves after the automobile is powered on;
the calculation unit is used for calculating the oil level of the engine oil in the measuring pipe according to the propagation time of the ultrasonic wave received and transmitted by the electronic engine oil sensor;
the base engine oil quantity determining unit is used for determining the current base engine oil quantity according to the current measured oil level through a measurement reference parameter pre-calibrated by the base rack;
the correction processing unit is used for identifying the working condition of the current vehicle, respectively processing and correcting the current basic engine oil quantity by using a processing strategy corresponding to the working condition of the current vehicle, and finally outputting a stable actual engine oil quantity signal;
and the sending processing unit is used for sending the actual engine oil quantity signal to the instrument through the gateway for displaying and reminding.
8. The system of claim 7, further comprising:
a measurement reference parameter table obtaining unit for determining the minimum oil quantity P of each engine oil according to the bench calibration and the whole vehicle calibrationminAnd the maximum oil amount PmaxAccording to the measurement reference parameters obtained by different engine oil filling quantities at different rotating speeds, and forming a corresponding measurement reference parameter table, wherein the measurement reference parameters comprise: at least one of the base oil level data, the return time, and the temperature correction parameter.
9. The system according to claim 8, characterized in that the calculation unit calculates the oil level in the oil measuring tube, in particular according to the following formula:
S＝v*Δt/2
wherein S is the currently measured oil level of the engine oil, v is the propagation speed of the ultrasonic wave in the liquid medium, and delta t is the propagation time of the ultrasonic wave in the engine oil measuring pipe.
10. The system of claim 9, wherein the base oil quantity determining unit is specifically configured to retrieve a current base oil quantity P corresponding to the current oil level from the measurement reference parameter table based on the measured current oil level and the rotational speed informationcurrent。
11. The system of claim 10, wherein the rework processing unit further comprises:
the working condition identification unit is used for identifying the working condition of the current vehicle and obtaining a processing strategy corresponding to the working condition of the current vehicle;
the correction subunit is configured to process and correct the current basic engine oil amount by using the processing strategy, and finally output a stable actual engine oil amount signal, and specifically includes:
when the current working condition of the vehicle is the engine standing working condition, short-time filtering is carried out on the current base engine oil quantity signal;
when the current working condition of the vehicle is the original running working condition of the engine, long-time filtering and temperature correction are carried out on the current basic engine oil quantity signal;
when the current working condition of the vehicle is the vehicle running working condition, long-time filtering processing, temperature correction and acceleration correction are carried out on the current basic engine oil quantity signal;
and when the current working condition of the vehicle is the engine flameout working condition, performing backflow correction on the current base engine oil quantity according to the measurement reference parameter table.
12. The system of claim 11, wherein the transmit processing unit further comprises:
a grade signal obtaining unit for obtaining grade signal L corresponding to the actual engine oil quantity signal by an engine controlleroil；
A hysteresis processing unit for processing the level signal L according to a preset oil level-hysteresis interval comparison tableoilPerforming hysteresis treatment; and generates corresponding engine oil quantity abnormity warning information Loilwarning；
A transmitting unit for transmitting the level signal LoilAnd abnormal engine oil quantity warning information LoilwarningAnd sending an engine oil quantity grade signal to the gateway through the Pcan bus, and sending the engine oil quantity grade signal to the instrument through the Bcan bus by the gateway for interface display or reminding of the instrument.
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| CN115326172A (en) * | 2022-07-16 | 2022-11-11 | 戴天智能科技（上海）有限公司 | Transformer oil level detection method and system, storage medium and intelligent terminal |
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