CN112324893B - Automatic transmission oil level monitoring system and monitoring method - Google Patents
Automatic transmission oil level monitoring system and monitoring method Download PDFInfo
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- CN112324893B CN112324893B CN202011193770.4A CN202011193770A CN112324893B CN 112324893 B CN112324893 B CN 112324893B CN 202011193770 A CN202011193770 A CN 202011193770A CN 112324893 B CN112324893 B CN 112324893B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012544 monitoring process Methods 0.000 title claims abstract description 25
- 239000010718 automatic transmission oil Substances 0.000 title claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims abstract description 135
- 239000003921 oil Substances 0.000 claims abstract description 120
- 238000012545 processing Methods 0.000 claims abstract description 12
- 239000000284 extract Substances 0.000 claims description 8
- 238000007781 pre-processing Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000004148 unit process Methods 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 208000035139 partial with pericentral spikes epilepsy Diseases 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0447—Control of lubricant levels, e.g. lubricant level control dependent on temperature
- F16H57/0449—Sensors or indicators for controlling the fluid level
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- General Details Of Gearings (AREA)
Abstract
The invention discloses an automatic transmission oil level monitoring system and a monitoring method, comprising an automatic transmission control unit, a combination instrument, a keyless entry and starting system, an image sensor, a light source controller, a light source and an ATF transparent filling pipe; the automatic transmission control unit, the light source controller, the combination instrument and the keyless entry and starting system are connected and communicated through a CAN bus, the light source controller is connected with the light source, the light source controller CAN control the light source to be turned on when a vehicle is started, light energy emitted when the light source is turned on irradiates the ATF transparent filling pipe, the image sensor is connected with the automatic transmission control unit, an oil level image of the ATF transparent filling pipe CAN be collected and sent to the automatic transmission control unit to be processed and judged, and the automatic transmission control unit CAN send a processing and judging result to the combination instrument to be displayed. The invention can accurately identify the oil level condition and remind the user of paying attention, thereby avoiding causing the fault of the automatic transmission and causing the complaint of the user.
Description
Technical Field
The invention belongs to the field of automatic transmissions of automobiles, and particularly relates to an automatic transmission oil level monitoring system and an automatic transmission oil level monitoring method.
Background
AT present, automatic transmissions (including AT/DCT/CVT automatic transmissions) mainly rely on automatic transmission oil (i.e., ATF) for transmission, lubrication and cooling, the amount of ATF added has a great influence on the overall performance of the automatic transmission, and too high or too low oil level of the automatic transmission will cause the problems of shifting slip, abnormal sound and shifting impact of the automatic transmission, even ablation of the automatic transmission. In the small-batch production stage of automobiles, in order to confirm the oil level of the automatic transmission, a host factory usually performs 3-5 pieces of oil level detection and sampling inspection on the whole automobile at the stage.
For the oil level detection of the automatic transmission, the current methods mainly include two methods: one is that the oil level is detected through an oil dipstick, an operator can insert the oil dipstick into the automatic transmission through an oil filling hole or an oil filling pipe of the automatic transmission to detect the oil level, and when the oil of the automatic transmission is positioned in an oil level standard area, the oil level is normal; and secondly, detecting by an overflow method, wherein the method mainly comprises the steps of overflowing the ATF exceeding the height of the overflow pipe from the overflow pipe, weighing the overflowing ATF, and then contrasting the weight standard range of the ATF at the temperature of the automatic transmission to determine whether the oil level is normal.
The two automatic transmission oil level detection methods can well identify the abnormal condition of the oil level of the automatic transmission, but are not intelligent enough, and the oil level cannot be preliminarily judged to identify the abnormal condition of the oil level when a vehicle is started every time so as to remind a user of confirmation, but often confirm the oil level after the fault problem of the related automatic transmission occurs; therefore, it cannot predict the oil level in advance, and thus cannot avoid the problem of malfunction of the automatic transmission due to the factor that the oil level of the automatic transmission is too low or too high.
Disclosure of Invention
The invention aims to provide an automatic transmission oil level monitoring system and a monitoring method, which can accurately identify the oil level condition (normal/over-high/over-low oil level) and remind a user of noticing, so as to avoid causing the failure of the automatic transmission and causing the complaint of the user.
The invention relates to an automatic transmission oil level monitoring system which comprises an automatic transmission control unit, a combination instrument, a keyless entry and starting system, an image sensor, a light source controller, a light source and an ATF transparent filling pipe communicated with a transmission shell through an ATF filling port; the automatic transmission control unit, the light source controller, the combination instrument and the keyless entry and starting system are connected and communicated through a CAN bus, the keyless entry and starting system CAN send a vehicle starting signal to the CAN bus, the light source controller is connected with the light source, the light source controller CAN control the light source to be turned on when the vehicle is started, light energy sent out when the light source is turned on irradiates on the ATF transparent filling pipe, the image sensor is connected with the automatic transmission control unit, the image sensor CAN collect an oil level image of the ATF transparent filling pipe and send the oil level image to the automatic transmission control unit for processing and judging, and the automatic transmission control unit CAN send a processing and judging result to the combination instrument for displaying.
The oil level monitoring method of the automatic transmission adopts the oil level monitoring system of the automatic transmission, and comprises the following steps:
when a vehicle starting signal sent by a keyless entry and starting system is received, the light source controller controls the light source to be turned on, the automatic transmission control unit processes an oil level image of the ATF transparent filling pipe acquired by the image sensor to obtain a current oil level column coordinate N * 。
The control unit of the automatic transmission converts the current oil level row coordinate N * And comparing the oil level with a preset oil level lower limit column coordinate T1 and a preset oil level upper limit column coordinate T2: if T1 is less than or equal to N * If the oil level of the automatic transmission is not more than T2, judging that the oil level of the automatic transmission is normal, sending the normal information of the oil level of the automatic transmission to a combination meter, and displaying that the oil level of the automatic transmission is normal by the combination meter; if N is present * <T1, judging that the oil level of the automatic transmission is too low, sending the too low oil level information of the automatic transmission to a combination meter, and displaying that the oil level of the automatic transmission is too low by the combination meter; if N is present * >And T2, judging that the oil level of the automatic transmission is too high, sending the information of the too high oil level of the automatic transmission to a combination meter, and displaying the too high oil level of the automatic transmission by the combination meter.
The automatic transmission control unit sends a light source turning-off request signal to the light source controller, and the light source controller controls the light source to be turned off.
Preferably, the automatic transmission control unit processes an oil level image of the ATF transparent filler pipe acquired by the image sensor to obtain a current oil level column coordinate N * The specific mode is as follows:
the automatic transmission control unit extracts the ROI (region of interest) of the oil level image of the ATF transparent filling pipe acquired by the image sensor to obtain an ROI S （m,n） And M is more than or equal to M/2-b/2 and less than or equal to M/2+b/2,1 and less than or equal to N, wherein M is the number of rows of pixel points of the oil-level image, N is the number of columns of pixel points of the oil-level image, and b is the pixel width of the preset extraction area.
Automatic transmission control unit for ROI area S （m,n） And carrying out image preprocessing to obtain an ROI image.
And the automatic transmission control unit performs vertical projection on the ROI image along the column direction according to the pixel linear weighted average gray value f to obtain a column-gray mean value relation graph N-f.
The automatic transmission control unit extracts the characteristics of the relation graph N-f of the row and the gray mean value and searches for a gradient value | f n -f n-1 Global maximum point, the gradient value | f n -f n-1 Taking the column coordinate corresponding to the | global maximum point as the column coordinate N of the current oil level * 。
Preferably, the automatic transmission control unit controls the ROI area S （m,n） The median filtering algorithm is adopted during image preprocessing, so that the interference of noise points on the image can be effectively avoided.
According to the invention, an image processing technology is introduced, when a user starts a vehicle, the oil level of the automatic transmission is accurately pre-judged, and after the condition (normal or too low or too high) of the oil level of the automatic transmission is judged, the user is reminded of paying attention through the combination meter, so that the problem of corresponding automatic transmission fault caused by the fact that the user starts the vehicle due to too low or too high oil level is avoided, meanwhile, the oil level monitoring of the automatic transmission is intelligentized, and the complaint of the user is avoided.
Drawings
Fig. 1 is a schematic diagram of an automatic transmission oil level monitoring system in the present embodiment.
Fig. 2 is a flowchart of processing judgment of the automatic transmission control unit in the present embodiment.
Fig. 3 is a control flowchart of the light source controller in this embodiment.
Fig. 4 is a flowchart of the processing of the combination meter in the present embodiment.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The automatic transmission oil level monitoring system shown in fig. 1 includes an automatic transmission control unit 1 (i.e., TCU), a combination meter 5, a keyless entry and start system 6 (i.e., PEPS), an image sensor 2, a light source controller 3, a light source 4, and an ATF transparent fill pipe 7 that communicates with a transmission housing 8 through an ATF fill port. Automatic transmission oil (namely ATF) is drained into the ATF transparent filling pipe 7 through the ATF filling port for monitoring, and the oil level in the transmission shell 8 and the oil level in the ATF transparent filling pipe 7 can keep the same liquid level height due to the fact that the first vent hole 81 is formed above the automatic transmission shell 8 and the second vent hole 71 is formed in the head portion of the ATF transparent filling pipe 7.
The automatic transmission control unit 1, the light source controller 3, the combination instrument 5 and the keyless entry and starting system 6 are connected and communicated through a CAN bus, the keyless entry and starting system 6 CAN send a vehicle starting signal to the CAN bus, the light source controller 3 is connected with the light source 4, the light source 4 CAN be controlled to be turned on by the light source controller 3 when the vehicle is started, light energy emitted when the light source 4 is turned on irradiates on the ATF transparent filling pipe 7, the image sensor 2 is connected with the automatic transmission control unit 1, the image sensor 2 CAN collect an oil level image of the ATF transparent filling pipe 7 and send the oil level image to the automatic transmission control unit 1 for processing and judgment, and the automatic transmission control unit 1 CAN send a processing and judgment result to the combination instrument 5 for display.
As shown in fig. 2, 3, and 4, the automatic transmission oil level monitoring method in the present embodiment employs the automatic transmission oil level monitoring system shown in fig. 1, and includes:
step one, when a vehicle starting signal (indicating that a vehicle is started) sent by a keyless entry and starting system 6 is received, a light source controller 3 controls a light source 4 to be turned on, an automatic transmission control unit 1 processes an oil level image of an ATF (automatic transfer function) transparent filling pipe 7 acquired by an image sensor 2 to obtain a current oil level column coordinate N * (ii) a The specific treatment method comprises the following steps:
s1, the automatic transmission control unit 1 extracts ROI (region of interest) of an oil level image of the ATF transparent filling pipe 7 acquired by the image sensor 2 to obtain an ROI S （m,n） And M is more than or equal to M/2-b/2 and less than or equal to M/2+b/2,1 and less than or equal to N, wherein M is the number of rows of pixel points of the oil-level image, N is the number of columns of pixel points of the oil-level image, and b is the pixel width of the preset extraction area.
S2, the automatic transmission control unit 1 adopts a median filtering algorithm to perform filtering on the ROI area S （m,n） And carrying out image preprocessing to obtain an ROI image.
And S3, the automatic transmission control unit 1 vertically projects the ROI image along the column direction according to the pixel linear weighted average gray value f to obtain a column-gray mean value relation graph N-f.
S4, the automatic transmission control unit 1 extracts the characteristics of the relation graph N-f of the row and the gray mean value and searches for a gradient value | f n -f n-1 Global maximum point, the gradient value | f n -f n-1 Taking the column coordinate corresponding to the | global maximum point as the column coordinate N of the current oil level * 。
Step two, the automatic transmission control unit 1 coordinates N of the current oil level column * And comparing the oil level with a preset oil level lower limit column coordinate T1 and a preset oil level upper limit column coordinate T2: if T1 is less than or equal to N * If the oil level of the automatic transmission is not more than T2, judging that the oil level of the automatic transmission is normal, sending the normal information of the oil level of the automatic transmission to the combination meter 5, and displaying that the oil level of the automatic transmission is normal by the combination meter 5; if N is present * <T1, judging that the oil level of the automatic transmission is too low, sending the information of the too low oil level of the automatic transmission to a combination meter 5, and displaying that the oil level of the automatic transmission is too low by the combination meter 5; if N is present * >And T2, judging that the oil level of the automatic transmission is too high, sending the information of the too high oil level of the automatic transmission to the combination meter 5, and displaying that the oil level of the automatic transmission is too high by the combination meter 5.
And step three, the automatic transmission control unit 1 sends a light source closing request signal, the light source closing request signal is sent to the light source controller 3, and the light source controller 3 controls the light source 4 to be closed.
As shown in fig. 2, when the above monitoring method is implemented, the processing and determining process of the automatic transmission control unit 1 is as follows:
firstly, the automatic transmission control unit 1 judges whether a vehicle starting signal sent by a keyless entry and starting system 6 is received, if so (indicating that the vehicle is starting), the second step is executed, otherwise, the second step is finished;
secondly, the automatic transmission control unit 1 extracts an ROI (region of interest) of an oil level image in the ATF (automatic transfer function) transparent filling pipe 7 acquired by the image sensor 2 to obtain an ROI S （m,n） Then, the third step is executed; m is more than or equal to M/2-b/2 and less than or equal to M/2+b/2,1 and less than or equal to N, M is the number of rows of pixel points of the oil level image, N is the number of columns of pixel points of the oil level image, and b is the pixel width of a preset extraction area;
thirdly, the automatic transmission control unit 1 adopts a median filtering algorithm to the ROI S （m,n） Carrying out image preprocessing to obtain an ROI image, and then executing the fourth step;
fourthly, the automatic transmission control unit 1 vertically projects the ROI image along the row direction according to the pixel linear weighted average gray value f to obtain a row-gray mean value relation graph N-f, and then the fifth step is executed;
fifthly, the automatic transmission control unit 1 extracts the characteristics of the relation graph N-f of the row and the gray mean value and searches for a gradient value | f n -f n-1 Global maximum point, the gradient value | f n -f n-1 Taking the column coordinate corresponding to the | global maximum point as the column coordinate N of the current oil level * Then, the sixth step is executed;
sixthly, the automatic transmission control unit 1 judges whether T1 is less than or equal to N and less than or equal to T2, if so, the seventh step is executed, otherwise, the eighth step is executed; wherein T1 is a preset oil level lower limit column coordinate, and T2 is a preset oil level upper limit column coordinate;
seventhly, the automatic transmission control unit 1 judges that the oil level of the automatic transmission is normal, sends the normal information of the oil level of the automatic transmission to the combination meter 5, and then executes the eleventh step;
eighthly, the automatic transmission control unit 1 judges whether N x < T1, if so, the ninth step is executed, otherwise, the tenth step is executed;
ninthly, the automatic transmission control unit 1 judges that the oil level of the automatic transmission is too low, sends the oil level of the automatic transmission too low information to the combination meter 5, and then executes the eleventh step;
tenth step, the automatic transmission control unit 1 determines that the oil level of the automatic transmission is too high, sends the information of the oil level of the automatic transmission to the combination meter 5, and then executes the eleventh step;
the eleventh step, the automatic transmission control unit 1 sends a light source off request signal, and sends the light source off request signal to the light source controller 3, and then ends.
As shown in fig. 3, when the monitoring method is implemented, the control process of the light source controller 3 is as follows:
step one, the light source controller 3 judges whether a vehicle starting signal sent by the keyless entry and starting system 6 is received, if so (indicating that the vehicle is starting), the second step is executed, otherwise, the operation is finished;
secondly, the light source controller 3 controls the light source 4 to be turned on, and then the third step is executed;
thirdly, the light source controller 3 judges whether a light source closing request signal sent by the automatic transmission control unit 1 is received, if so, the fourth step is executed, otherwise, the third step is continuously executed;
and fourthly, the light source controller 3 controls the light source 4 to be closed, and then the operation is finished.
As shown in fig. 4, when the monitoring method is implemented, the processing procedure of the combination meter 5 is as follows:
firstly, the combination meter 5 judges whether the oil level normal information of the automatic transmission sent by the automatic transmission control unit 1 is received, if so, the second step is executed, otherwise, the third step is executed;
secondly, the combination meter 5 displays that the oil level of the automatic transmission is normal, and then the process is finished;
thirdly, the combination meter 5 judges whether the information that the oil level of the automatic transmission is too low, which is sent by the control unit 1 of the automatic transmission, is received, if so, the fourth step is executed, otherwise, the fifth step is executed;
fourthly, the combination meter 5 displays that the oil level of the automatic transmission is too low, and then the process is finished;
fifthly, the combination meter 5 judges whether the information that the oil level of the automatic transmission is too high, which is sent by the control unit 1 of the automatic transmission, is received, if so, the sixth step is executed, otherwise, the operation is finished;
and sixthly, the combination meter 5 displays that the oil level of the automatic transmission is too high, and then the process is finished.
Claims (2)
1. An automatic transmission oil level monitoring method adopts an automatic transmission oil level monitoring system which comprises an automatic transmission control unit (1), a combination instrument (5), a keyless entry and starting system (6), an image sensor (2), a light source controller (3), a light source (4) and an ATF transparent filling pipe (7) communicated with a transmission shell (8) through an ATF filling port; the automatic transmission control unit (1), the light source controller (3), the combination instrument (5) and the keyless entry and starting system (6) are connected and communicated through a CAN bus, the keyless entry and starting system (6) CAN send a vehicle starting signal to the CAN bus, the light source controller (3) is connected with the light source (4), the light source controller CAN control the light source to be turned on when the vehicle is started, light energy emitted when the light source is turned on irradiates on the ATF transparent filling pipe (7), the image sensor (2) is connected with the automatic transmission control unit (1), the image sensor (2) CAN acquire an oil level image of the ATF transparent filling pipe (7) and send the oil level image to the automatic transmission control unit (1) for processing and judgment, and the automatic transmission control unit (1) CAN send a processing and judgment result to the combination instrument (5) for displaying; characterized in that the method comprises:
when a vehicle starting signal sent by a keyless entry and starting system (6) is received, a light source controller (3) controls a light source (4) to be turned on, an automatic transmission control unit (1) processes an oil level image of an ATF (automatic transfer function) transparent filling pipe (7) acquired by an image sensor (2) to obtain a current oil level column coordinate N * ；
The automatic transmission control unit (1) coordinates N of the current oil level column * And comparing the oil level with a preset oil level lower limit column coordinate T1 and a preset oil level upper limit column coordinate T2: if T1 is not more than N * If the oil level of the automatic transmission is not more than T2, judging that the oil level of the automatic transmission is normal, sending the normal information of the oil level of the automatic transmission to a combination meter (5), and displaying that the oil level of the automatic transmission is normal by the combination meter (5); if N is present * <T1, judging that the oil level of the automatic transmission is too low, sending the information that the oil level of the automatic transmission is too low to a combination meter (5), and displaying that the oil level of the automatic transmission is too low by the combination meter (5); if N is present * >T2, judging that the oil level of the automatic transmission is too high, sending the information of the too high oil level of the automatic transmission to a combination meter (5), and displaying that the oil level of the automatic transmission is too high by the combination meter (5);
the automatic transmission control unit (1) sends a light source closing request signal to the light source controller (3), and the light source controller (3) controls the light source (4) to be closed;
wherein the automatic transmission control unit (1) processes the oil level image to obtain a current oil level column coordinate N * The specific mode is as follows:
the automatic transmission control unit (1) extracts an ROI (region of interest) of the oil level image to obtain an ROI S （m,n） M is more than or equal to M/2-b/2 and is less than or equal to M/2+b/2,1 and is less than or equal to N, M is the number of rows of pixel points of the oil level image, N is the number of columns of pixel points of the oil level image, and b is the pixel width of a preset extraction area;
the automatic transmission control unit (1) controls the ROI area S （m,n） Carrying out image preprocessing to obtain an ROI image;
the automatic transmission control unit (1) vertically projects the ROI image along the column direction according to the pixel linear weighted average gray value f to obtain a column-gray mean value relation graph N-f;
the automatic transmission control unit (1) extracts the characteristics of the relation graph N-f of the row and the gray mean value and searches a gradient value | f n -f n-1 Global maximum point, the gradient value | f n -f n-1 Taking the column coordinate corresponding to the | global maximum point as the column coordinate N of the current oil level * 。
2. The automatic transmission oil level monitoring method according to claim 1, characterized in that: the automatic transmission control unit (1) controls the ROI area S （m,n） And a median filtering algorithm is adopted when image preprocessing is carried out.
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