CN116357454B - Identification method and device for engine torque limiting state - Google Patents
Identification method and device for engine torque limiting state Download PDFInfo
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- CN116357454B CN116357454B CN202310365012.3A CN202310365012A CN116357454B CN 116357454 B CN116357454 B CN 116357454B CN 202310365012 A CN202310365012 A CN 202310365012A CN 116357454 B CN116357454 B CN 116357454B
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000002347 injection Methods 0.000 claims abstract description 280
- 239000007924 injection Substances 0.000 claims abstract description 280
- 239000003921 oil Substances 0.000 claims abstract description 179
- 238000012544 monitoring process Methods 0.000 claims abstract description 142
- 239000010724 circulating oil Substances 0.000 claims abstract description 33
- 239000000446 fuel Substances 0.000 claims description 60
- 230000002159 abnormal effect Effects 0.000 claims description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 125000004122 cyclic group Chemical group 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004913 activation 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
- 239000010705 motor oil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/083—Safety, indicating, or supervising devices relating to maintenance, e.g. diagnostic device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a method and a device for identifying a torque limiting state of an engine, wherein the method comprises the following steps: acquiring a circulating oil injection quantity threshold value table corresponding to the vehicle type of the vehicle to be tested; the circulating oil injection quantity threshold value table comprises a plurality of monitoring intervals consisting of different rotating speeds and different accelerator opening degrees, and each monitoring interval is provided with a corresponding oil injection quantity threshold value; acquiring the current rotating speed and the current accelerator opening of a vehicle to be tested, and inquiring a first monitoring interval corresponding to the current rotating speed and the current accelerator opening and a first oil injection quantity threshold corresponding to the first monitoring interval in a circulating oil injection quantity threshold table; and acquiring the current oil injection quantity of the vehicle to be tested, and determining that the vehicle to be tested is limited to twist when the current oil injection quantity is lower than a first oil injection quantity threshold value in a preset time period. By adopting the embodiment of the invention, the torque limiting fault information of the vehicle to be detected can be accurately determined in real time by comparing the oil injection quantity threshold value of the monitoring interval with the current oil injection quantity of the vehicle to be detected.
Description
Technical Field
The invention relates to the technical field of automobile engines, in particular to an identification method and device for a torque limiting state of an engine.
Background
In order to meet increasingly stringent emission regulations, after the OBD system monitors that the fault causing the emission exceeding the standard occurs or continuously occurs for a certain time, the torque limiter is activated, the maximum torque of an engine is limited to a certain proportion for vehicles with emission grades of IV and V, and the vehicle speed is limited by serious faults besides torque for vehicles with VI; on the other hand, in order to ensure the healthy operation of the engine, when the faults of the engine, such as too high engine oil pressure, too high rotating speed, too high water temperature and the like, which can cause the damage of the engine are monitored, the ECM actively reduces or cuts off the oil injection quantity so as to reduce the output power and avoid the expansion of the faults; thirdly, in order to achieve the purpose of saving oil, some vehicles are provided with an oil saving switch, and the power output is limited when the vehicle is placed in a half-load or no-load state; finally, in addition to the active torque limitation described above, passive limitations may occur when the supply or intake air amount is insufficient.
At present, after a vehicle is limited in torsion (including torsion limitation, rotation limitation and vehicle speed limitation), a fault indicator lamp on an instrument is lightened when the fault indicator lamp is actively activated due to faults, if the fault indicator lamp senses that the power is insufficient, the fault which causes torsion limitation is possibly indicated, but the mode cannot accurately reflect the torsion limitation state; the specific torque limiting information needs an experienced maintenance technician to judge whether the torque is limited and acquire the torque limiting proportion through a data flow when the diagnostic instrument is used for reading the torque limiting activation along with the vehicle, or a technician of a vehicle manufacturer can infer whether the torque limiting and the torque limiting proportion occur according to the fault code, the torque limiting calibration strategy corresponding to the fault code and the description of a user; these methods are limited by the level of technicians and require high diagnostic equipment, and thus cannot provide accurate torque limiting fault information in real time.
Disclosure of Invention
The invention provides a method and a device for identifying a torque limiting state of an engine, which are used for solving the technical problem that the torque limiting fault information cannot be accurately identified in real time in a driving scene in the prior art.
In order to solve the above technical problems, an embodiment of the present invention provides a method for identifying a torque limiting state of an engine, including:
acquiring a circulating oil injection quantity threshold value table corresponding to the vehicle type of the vehicle to be tested; the circulating oil injection quantity threshold value table comprises a plurality of monitoring intervals consisting of different rotating speeds and different accelerator opening degrees, and each monitoring interval is provided with a corresponding oil injection quantity threshold value;
acquiring the current rotating speed and the current accelerator opening of the vehicle to be tested, and inquiring a first monitoring interval corresponding to the current rotating speed and the current accelerator opening and a first oil injection quantity threshold corresponding to the first monitoring interval in the circulating oil injection quantity threshold table;
and acquiring the current oil injection quantity of the vehicle to be tested, and determining that the vehicle to be tested is limited to twist when the current oil injection quantity is lower than the first oil injection quantity threshold value in a preset time period.
According to the invention, the circulating oil injection quantity threshold value table corresponding to the vehicle type of the vehicle to be detected is obtained, and then the monitoring section of the circulating oil injection quantity threshold value table in which the running condition of the vehicle is located is determined according to the current running data of the vehicle to be detected, so that the accuracy of identifying the torque limiting fault is improved, and the torque limiting fault information of the vehicle to be detected can be accurately determined in real time by comparing the oil injection quantity threshold value of the monitoring section with the current oil injection quantity of the vehicle to be detected.
Further, before the cycle fuel injection quantity threshold value table corresponding to the vehicle type of the vehicle to be tested is obtained, the method includes:
selecting a plurality of vehicles which are the same as the vehicle type of the vehicle to be tested, and acquiring the running data of each vehicle in the plurality of vehicles;
a threshold value table generation step: dividing a plurality of monitoring intervals according to the first driving data and a preset rotating speed interval and a preset accelerator opening interval, and determining an oil injection quantity threshold value corresponding to each monitoring interval to obtain an oil injection quantity threshold value table corresponding to the first driving data; wherein the first travel data includes: the running data of each vehicle or the combined running data;
according to the oil injection quantity threshold value table corresponding to the running data of each vehicle, after determining and replacing the running data of the abnormal vehicle, turning to a threshold value table generation step until the oil injection quantity threshold value table with the preset quantity is obtained;
and merging the running data of the preset quantity of oil injection quantity threshold value tables to obtain merged running data, transferring to a threshold value table generation step to obtain an oil injection quantity threshold value table corresponding to the merged running data, and generating the circulating oil injection quantity threshold value table after abnormal value rejection is carried out on the oil injection quantity threshold value table corresponding to the merged running data.
According to the invention, a plurality of vehicles of a certain vehicle type are selected to acquire running data, so that errors possibly caused by single running data in a subsequently generated oil injection quantity threshold value table are avoided; after the oil injection quantity threshold value table is generated, the different vehicles are replaced and the running data are updated, so that the problems of errors caused by abnormal vehicles of the oil injection quantity threshold value table and the reduction of accuracy of the oil injection quantity threshold value table are avoided; in addition, under the condition of no abnormal vehicle, the combined data generates a new oil injection quantity threshold value table, and abnormal value elimination is carried out, so that the obtained circulating oil injection quantity threshold value table provides more accurate torque fault information identification.
Further, according to the first driving data, dividing a plurality of monitoring intervals according to a preset rotating speed interval and a preset accelerator opening interval, and determining an oil injection quantity threshold value corresponding to each monitoring interval to obtain an oil injection quantity threshold value table corresponding to the first driving data, wherein the oil injection quantity threshold value table specifically comprises:
selecting first data meeting a preset rotating speed range and a preset accelerator opening range from the first driving data, and dividing a plurality of monitoring intervals according to preset rotating speed intervals and preset accelerator opening intervals;
removing first data of a preset proportion with the lowest oil injection quantity in each monitoring interval;
when a certain monitoring interval is lower than a preset accelerator opening value, selecting the minimum value of the fuel injection quantity of the residual first data of the certain monitoring interval as a fuel injection quantity threshold value corresponding to the certain monitoring interval;
when a certain monitoring interval is higher than a preset accelerator opening value, selecting the product of the fuel injection quantity mode of the residual first data of the certain monitoring interval and a preset coefficient as a fuel injection quantity threshold value corresponding to the certain monitoring interval.
According to the invention, a plurality of monitoring intervals are divided according to the rotating speed interval and the accelerator opening interval, each monitoring interval is provided with a corresponding oil injection quantity threshold value, the limitation of the running condition of the vehicle can be realized when the oil injection quantity threshold value table is used for judging, and the torque limiting identification is carried out in a specific rotating speed interval and accelerator opening interval, so that the torque limiting fault information of the vehicle to be tested can be accurately identified in real time.
Further, after determining and replacing the driving data of the abnormal vehicle, the method goes to a threshold table generating step until a preset number of oil injection quantity threshold tables are obtained, specifically:
acquiring the maximum value of the oil injection quantity threshold value table corresponding to the running data of each vehicle, and calculating the difference value between the maximum value of the oil injection quantity of each vehicle and the maximum value of the oil injection quantity of other vehicles;
when the difference value between the maximum value of the fuel injection quantity of a certain vehicle and the maximum value of the fuel injection quantity of other vehicles is larger than a first preset value, determining that the certain vehicle is an abnormal vehicle, replacing the abnormal vehicle, re-acquiring running data of each vehicle, and transferring to a threshold table generation step until a preset number of fuel injection quantity threshold tables are acquired.
According to the invention, after the plurality of oil injection quantity threshold tables are generated, the vehicle abnormality is monitored, the influence of the abnormal vehicle on the oil injection quantity threshold tables is eliminated until the oil injection quantity threshold tables with enough quantity are obtained, so that the accuracy of torque limiting identification through the oil injection quantity threshold tables is further realized.
Further, the merging of the running data of the preset number of oil injection quantity threshold value tables to obtain merged running data, and transferring to a threshold value table generating step to obtain an oil injection quantity threshold value table corresponding to the merged running data, and generating the circulating oil injection quantity threshold value table after abnormal value rejection of the oil injection quantity threshold value table corresponding to the merged running data, specifically:
combining the original data of the preset quantity of oil injection quantity threshold value tables to obtain combined running data, and then transferring the combined running data to a threshold value table generation step to obtain an oil injection quantity threshold value table corresponding to the combined running data;
replacing the fluctuation oil injection quantity threshold value in the oil injection quantity threshold value table corresponding to the combined driving data with the average value of adjacent oil injection quantities of the fluctuation oil injection quantity threshold value to obtain a tentative threshold value table;
and setting the temporary threshold table as the circulating fuel injection quantity threshold table when each monitoring interval of the temporary threshold table has a corresponding fuel injection quantity threshold.
According to the invention, the oil injection quantity threshold value table corresponding to the combined running data is obtained by using the combined running data, and the abnormal value or the fluctuation value of the oil injection quantity threshold value table is removed, so that the finally generated cyclic oil injection quantity threshold value table more accurately reflects the threshold value of the oil injection quantity in torque limiting.
Further, after merging the original data of the preset number of oil injection quantity threshold value tables to obtain merged running data, transferring to a threshold value table generating step, and after obtaining an oil injection quantity threshold value table corresponding to the merged running data, the method includes:
and when a certain detection section of the temporary threshold table does not have a corresponding fuel injection quantity threshold value, and the running data of the plurality of vehicles reach a first preset data quantity, merging the data of the plurality of vehicles into new merged running data, and transferring to a threshold table generation step.
When a certain monitoring section of the temporary threshold table lacks the oil injection quantity threshold value, the oil injection quantity threshold value table is regenerated by accumulating new running data, so that the oil injection quantity threshold value of the oil injection quantity threshold value table covers each monitoring section, and further, the torque limiting fault information is more accurately identified according to the oil injection quantity threshold value table.
Further, the driving data of each vehicle is the driving data of each vehicle in a preset water temperature range, a preset environment pressure range and a preset vehicle speed range.
Further, after the current fuel injection quantity of the vehicle to be tested is obtained, and when the current fuel injection quantity is lower than the first fuel injection quantity threshold value in a preset time period, determining that the vehicle to be tested is limited to twist includes:
selecting a plurality of monitoring intervals in which the running data quantity of the vehicle to be tested exceeds a second preset data quantity in the circulating oil injection quantity threshold value table;
calculating the torque limiting ratio of the plurality of monitoring intervals according to the mode of each of the plurality of monitoring intervals and the oil injection quantity threshold of each of the plurality of monitoring intervals;
the torque limiting ratio of the monitoring interval with the largest data quantity in the monitoring intervals is used as the torque limiting ratio of the driving cycle, or the torque limiting ratio of the monitoring interval with the largest accelerator opening in the monitoring intervals is used as the torque limiting ratio of the driving cycle; wherein, the expression of the torque limiting ratio is:
torque limiting ratio= (oil injection amount threshold value of monitoring section-oil injection amount mode of monitoring section)/(oil injection amount mode of monitoring section)
The fuel injection quantity threshold value of the monitoring interval is 100%.
According to the invention, whether the torsion limiting of the vehicle to be tested is generated or not is identified, the torsion limiting ratio is calculated, and the torsion limiting condition of the vehicle to be tested is reflected more accurately.
Further, after taking the torque limiting ratio of the monitoring interval with the largest data amount in the plurality of monitoring intervals as the torque limiting ratio of the driving cycle, or taking the torque limiting ratio of the monitoring interval with the largest accelerator opening in the plurality of monitoring intervals as the torque limiting ratio of the driving cycle, the method comprises the following steps:
after the stroke of the vehicle to be tested is finished, outputting a first time of determining the starting time of the vehicle to be tested for limiting torsion, a last time of determining the ending time of the vehicle to be tested for limiting torsion, determining the times of the vehicle to be tested for limiting torsion, the total mileage of the vehicle to be tested for limiting torsion, the maximum history of the single time of the vehicle to be tested for limiting torsion, the maximum torsion limiting proportion of the vehicle to be tested and the average torsion limiting proportion of the vehicle to be tested.
After the stroke of the vehicle to be tested is finished, the time and mileage recorded in each torsion limiting process are output, so that the torsion limiting fault information can more comprehensively reflect the torsion limiting condition of the vehicle to be tested.
On the other hand, the embodiment of the invention also provides a device for identifying the torque limiting state of the engine, which comprises the following steps: the system comprises a threshold value table acquisition module, a driving data acquisition module and a torque identification module;
the threshold value table acquisition module is used for acquiring a circulating oil injection quantity threshold value table corresponding to the vehicle type of the vehicle to be tested; the circulating oil injection quantity threshold value table comprises a plurality of monitoring intervals consisting of different rotating speeds and different accelerator opening degrees, and each monitoring interval is provided with a corresponding oil injection quantity threshold value;
the driving data acquisition module is used for acquiring the current rotating speed and the current accelerator opening of the vehicle to be detected, and inquiring a first monitoring interval corresponding to the current rotating speed and the current accelerator opening and a first fuel injection quantity threshold corresponding to the first monitoring interval in the circulating fuel injection quantity threshold table;
the torque identification module is used for acquiring the current oil injection quantity of the vehicle to be tested, and determining that the vehicle to be tested is limited in torsion when the current oil injection quantity is lower than the first oil injection quantity threshold value in a preset time period.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of a method for identifying a torque limiting state of an engine according to the present invention;
fig. 2 is a schematic flow chart of another embodiment of the method for identifying a torque limiting state of an engine according to the present invention;
FIG. 3 is a schematic flow chart of another embodiment of a method for identifying a torque limiting state of an engine according to the present invention;
fig. 4 is a schematic structural diagram of an embodiment of an engine torque limit state recognition device provided by the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the prior art, the limit proportion cannot be quantized in the running process of the vehicle, the turning-on fault lamp is not limited, and the fault lamp is not turned on after some of the limit torsion, so that whether the limit torsion occurs or not and the limit torsion proportion is calculated cannot be accurately judged according to the turning-on state and the perceived power state; the torque limiting fault identification of professionals cannot be carried out in the vehicle driving process, is limited by the level of technicians, has high requirements on a diagnostic instrument, and cannot provide accurate torque limiting fault information in real time. In order to solve the problem, the invention provides a method and a device for identifying the torque limiting state of an engine, and specific embodiments are as follows:
example 1
Referring to fig. 1, a flow chart of an embodiment of a method for identifying a torque limiting state of an engine according to the present invention includes steps 101-103, specifically as follows:
step 101: and acquiring a circulating oil injection quantity threshold value table corresponding to the vehicle type of the vehicle to be tested.
In this embodiment, the circulating fuel injection quantity threshold table includes a plurality of monitoring intervals composed of different rotational speeds and different accelerator openings, and each monitoring interval has a corresponding fuel injection quantity threshold.
In the embodiment, the same threshold value table is used for the manual gear of the same vehicle type; the same threshold value table is used for automatic gear of the same vehicle type.
Step 102: the method comprises the steps of obtaining the current rotating speed and the current accelerator opening of the vehicle to be tested, and inquiring a first monitoring interval corresponding to the current rotating speed and the current accelerator opening and a first oil injection quantity threshold corresponding to the first monitoring interval in the circulating oil injection quantity threshold table.
In this embodiment, when the ECM detects that a fault affecting normal operation of the engine occurs in the vehicle or there is a hidden danger of emissions exceeding the standard, the ECM limits the maximum output power to prevent occurrence or expansion of the hazard; under the specific rotation speed and accelerator opening, the fuel injection quantity is stable or higher than a threshold value, and when the fuel injection quantity of the vehicle to be tested under the rotation speed and accelerator opening is lower than the threshold value, the vehicle to be tested is in a torsion limiting state.
In the present embodiment, the current travel data includes: the current rotation speed, the current accelerator opening and the current oil injection quantity are obtained through a CAN bus or a K line of the vehicle to be tested.
In this embodiment, the accelerator opening is an accelerator pedal opening.
Step 103: and acquiring the current oil injection quantity of the vehicle to be tested, and determining that the vehicle to be tested is limited to twist when the current oil injection quantity is lower than the first oil injection quantity threshold value in a preset time period.
In this embodiment, when the current fuel injection amount is lower than the first fuel injection amount threshold in a preset time period, determining that the vehicle to be tested is limited in torsion specifically includes: and when the vehicle to be tested is in a preset water temperature range, a preset environment pressure range and a preset vehicle speed range, and the current oil injection quantity is lower than the first oil injection quantity threshold value in a preset time period, determining that the vehicle to be tested is limited.
In the embodiment, the preset water temperature range is more than or equal to 60 ℃, the preset environmental pressure range is more than or equal to 90kpa, and the influence of low temperature and plateau compensation on the oil injection quantity can be further eliminated; the preset vehicle speed range is less than 86km/h.
In this embodiment, the preset time period is 10s.
In this embodiment, when the vehicle to be tested is limited in torsion, a start-stop time of the vehicle to be tested in torsion, a driving distance of the vehicle to be tested in torsion limiting period, and a number of times of the vehicle to be tested in torsion limiting are recorded.
In this embodiment, when it is determined that the number of times of torque limiting of the vehicle to be tested exceeds three, voice broadcasting is performed, that is, "the torque output by the engine is limited and cannot reach the maximum power in the current driving cycle", the current driving cycle of the vehicle to be tested is not broadcasted after broadcasting, and the next driving cycle of the vehicle to be tested is restarted.
Referring to fig. 2, a flow chart of another embodiment of the method for identifying a torque limiting state of an engine according to the present invention mainly includes steps 201 to 204, specifically as follows:
in this embodiment, step 101 is preceded by steps 201-204.
Step 201: and selecting a plurality of vehicles which are the same as the vehicle type of the vehicle to be tested, and acquiring the running data of each vehicle in the plurality of vehicles.
Step 202: dividing a plurality of monitoring intervals according to the first driving data and a preset rotating speed interval and a preset accelerator opening interval, and determining an oil injection quantity threshold value corresponding to each monitoring interval to obtain an oil injection quantity threshold value table corresponding to the first driving data; wherein the first travel data includes: travel data for each vehicle or combined travel data.
In this embodiment, step 202 is a threshold table generating step, which may be used to generate an injection amount threshold table corresponding to each set of driving data.
In this embodiment, the preset rotation speed interval is 100rpm, and the preset accelerator opening interval is 5%.
In this embodiment, after obtaining the injection amount threshold table corresponding to the first traveling data, the method includes: when the oil injection quantity threshold value table corresponding to the first running data does not have continuous rotation speed intervals with the quantity exceeding three, for example, in three continuous intervals of 1000-1300rpm, the oil injection quantity value is absent in any one interval, the running data is obtained by reselecting the vehicle, or the running data of each vehicle is obtained again after the running data of the plurality of vehicles are accumulated to the third preset data quantity, and the step 202 is performed.
Further, according to the first driving data, dividing a plurality of monitoring intervals according to a preset rotating speed interval and a preset accelerator opening interval, and determining an oil injection quantity threshold value corresponding to each monitoring interval to obtain an oil injection quantity threshold value table corresponding to the first driving data, wherein the oil injection quantity threshold value table specifically comprises:
selecting first data meeting a preset rotating speed range and a preset accelerator opening range from the first driving data, and dividing a plurality of monitoring intervals according to preset rotating speed intervals and preset accelerator opening intervals;
removing first data of a preset proportion with the lowest oil injection quantity in each monitoring interval;
when a certain monitoring interval is lower than a preset accelerator opening value, selecting the minimum value of the fuel injection quantity of the residual first data of the certain monitoring interval as a fuel injection quantity threshold value corresponding to the certain monitoring interval;
when a certain monitoring interval is higher than a preset accelerator opening value, selecting the product of the fuel injection quantity mode of the residual first data of the certain monitoring interval and a preset coefficient as a fuel injection quantity threshold value corresponding to the certain monitoring interval.
In this embodiment, the preset rotation speed range is 1000 to NO-200rpm, where N0 is the rated rotation speed, i.e., the upper limit of the preset rotation speed range is a rotation speed lower than 200rpm of the rated rotation speed; the preset accelerator opening range is 60-100%.
In this embodiment, the preset proportion is 20%.
According to the invention, a plurality of monitoring intervals are divided according to the rotating speed interval and the accelerator opening interval, each monitoring interval is provided with a corresponding oil injection quantity threshold value, the limitation of the running condition of the vehicle can be realized when the oil injection quantity threshold value table is used for judging, and the torque limiting identification is carried out in a specific rotating speed interval and accelerator opening interval, so that the torque limiting fault information of the vehicle to be tested can be accurately identified in real time.
Step 203: and after determining and replacing the driving data of the abnormal vehicles according to the oil injection quantity threshold value table corresponding to the driving data of each vehicle, turning to step 202 until the preset quantity of oil injection quantity threshold value tables are obtained.
Further, after determining and replacing the driving data of the abnormal vehicle according to the oil injection quantity threshold table corresponding to the driving data of each vehicle, the method goes to step 202 until a preset number of oil injection quantity threshold tables are obtained, specifically:
acquiring the maximum value of the oil injection quantity threshold value table corresponding to the running data of each vehicle, and calculating the difference value between the maximum value of the oil injection quantity of each vehicle and the maximum value of the oil injection quantity of other vehicles;
when the difference between the maximum value of the fuel injection quantity of a certain vehicle and the maximum value of the fuel injection quantity of other vehicles is larger than a first preset value, determining that the certain vehicle is an abnormal vehicle, replacing the abnormal vehicle, acquiring running data of each vehicle again, and turning to step 202 until a preset quantity of fuel injection quantity threshold value tables are acquired.
In this embodiment, the unit of the fuel injection amount and the first preset value is L/ms.
According to the invention, after the plurality of oil injection quantity threshold tables are generated, the vehicle abnormality is monitored, the influence of the abnormal vehicle on the oil injection quantity threshold tables is eliminated until the oil injection quantity threshold tables with enough quantity are obtained, so that the accuracy of torque limiting identification through the oil injection quantity threshold tables is further realized.
Step 204: and merging the running data of the preset quantity of oil injection quantity threshold value tables to obtain merged running data, and turning to step 202 to obtain an oil injection quantity threshold value table corresponding to the merged running data, and generating the circulating oil injection quantity threshold value table after abnormal value rejection is carried out on the oil injection quantity threshold value table corresponding to the merged running data.
Further, the running data of the preset number of oil injection quantity threshold value tables are combined to obtain combined running data, and the step 202 is performed to obtain an oil injection quantity threshold value table corresponding to the combined running data, and after abnormal value rejection is performed on the oil injection quantity threshold value table corresponding to the combined running data, the circulating oil injection quantity threshold value table is generated, specifically:
combining the original data of the preset quantity of oil injection quantity threshold value tables to obtain combined running data, and then transferring to step 202 to obtain an oil injection quantity threshold value table corresponding to the combined running data;
replacing the fluctuation oil injection quantity threshold value in the oil injection quantity threshold value table corresponding to the combined driving data with the average value of adjacent oil injection quantities of the fluctuation oil injection quantity threshold value to obtain a tentative threshold value table;
and setting the temporary threshold table as the circulating fuel injection quantity threshold table when each monitoring interval of the temporary threshold table has a corresponding fuel injection quantity threshold.
According to the invention, the oil injection quantity threshold value table corresponding to the combined running data is obtained by using the combined running data, and the abnormal value or the fluctuation value of the oil injection quantity threshold value table is removed, so that the finally generated cyclic oil injection quantity threshold value table more accurately reflects the threshold value of the oil injection quantity in torque limiting.
In this embodiment, after merging the raw data of the preset number of injection quantity threshold tables to obtain merged running data, transferring to a threshold table generating step, and obtaining an injection quantity threshold table corresponding to the merged running data, the method includes: and when a certain detection section of the temporary threshold table does not have a corresponding fuel injection quantity threshold, and the running data of the vehicles reach a first preset data quantity, merging the data of the vehicles into new merged running data, and turning to step 202.
When a certain monitoring section of the temporary threshold table lacks the oil injection quantity threshold value, the oil injection quantity threshold value table is regenerated by accumulating new running data, so that the oil injection quantity threshold value of the oil injection quantity threshold value table covers each monitoring section, and further, the torque limiting fault information is more accurately identified according to the oil injection quantity threshold value table.
In this embodiment, the driving data of each vehicle is driving data of each vehicle in a preset water temperature range, a preset environmental pressure range and a preset vehicle speed range; the preset water temperature range is more than or equal to 60 ℃, the preset environmental pressure range is more than or equal to 90kpa, and the influence of low temperature and plateau compensation on the oil injection quantity can be further eliminated; the preset vehicle speed range is less than 86km/h.
In this embodiment, the running data of each vehicle is running data of each vehicle in a preset water temperature range, a preset ambient pressure range, a preset vehicle speed range and a preset accelerator pedal change rate; wherein the change rate of the preset accelerator pedal is less than or equal to 10%, and the expression is as follows: accelerator pedal change rate= |accelerator pedal opening at the current moment-accelerator pedal opening at the last moment|, if the acquisition time difference > = 2s, the accelerator pedal change rate is not calculated;
according to the invention, a plurality of vehicles of a certain vehicle type are selected to acquire running data, so that errors possibly caused by single running data in a subsequently generated oil injection quantity threshold value table are avoided; after the oil injection quantity threshold value table is generated, the different vehicles are replaced and the running data are updated, so that the problems of errors caused by abnormal vehicles of the oil injection quantity threshold value table and the reduction of accuracy of the oil injection quantity threshold value table are avoided; in addition, under the condition of no abnormal vehicle, the combined data generates a new oil injection quantity threshold value table, and abnormal value elimination is carried out, so that the obtained circulating oil injection quantity threshold value table provides more accurate torque fault information identification.
Referring to fig. 3, a flow chart of still another embodiment of the method for identifying a torque limit state of an engine according to the present invention includes steps 301 to 303, specifically as follows:
step 301: and selecting a plurality of monitoring intervals in which the running data quantity of the vehicle to be tested exceeds a second preset data quantity in the circulating oil injection quantity threshold value table.
Step 302: and calculating the torque limiting ratio of the monitoring intervals according to the mode of each of the monitoring intervals and the oil injection quantity threshold of each of the monitoring intervals.
Step 303: and taking the torque limiting ratio of the monitoring interval with the largest data quantity in the monitoring intervals as the torque limiting ratio of the driving cycle, or taking the torque limiting ratio of the monitoring interval with the largest accelerator opening in the monitoring intervals as the torque limiting ratio of the driving cycle.
In this embodiment, the expression of the torque limiting ratio is:
torque limiting ratio= (oil injection amount threshold value of monitoring section-oil injection amount mode of monitoring section)/(oil injection amount mode of monitoring section)
The fuel injection quantity threshold value of the monitoring interval is 100%.
According to the invention, whether the torsion limiting of the vehicle to be tested is generated or not is identified, the torsion limiting ratio is calculated, and the torsion limiting condition of the vehicle to be tested is reflected more accurately.
In this embodiment, after step 303, it includes: after the stroke of the vehicle to be tested is finished, outputting a first time of determining the starting time of the vehicle to be tested for limiting torsion, a last time of determining the ending time of the vehicle to be tested for limiting torsion, determining the times of the vehicle to be tested for limiting torsion, the total mileage of the vehicle to be tested for limiting torsion, the maximum history of the single time of the vehicle to be tested for limiting torsion, the maximum torsion limiting proportion of the vehicle to be tested and the average torsion limiting proportion of the vehicle to be tested.
After the stroke of the vehicle to be tested is finished, the time and mileage recorded in each torsion limiting process are output, so that the torsion limiting fault information can more comprehensively reflect the torsion limiting condition of the vehicle to be tested.
In this embodiment, after step 303, the method further includes: and outputting the total journey mileage of the vehicle to be tested and the total journey duration of the vehicle to be tested after the journey of the vehicle to be tested is finished.
In this embodiment, after the trip of the vehicle to be tested is finished, the recorded torque limiting fault information may be cleared.
Referring to fig. 4, a schematic structural diagram of an embodiment of an engine torque limit state recognition device according to the present invention includes: a threshold table acquisition module 401, a travel data acquisition module 402, and a torque identification module 403.
In this embodiment, the threshold value table obtaining module 401 is configured to obtain a cyclic oil injection amount threshold value table corresponding to a vehicle type of a vehicle to be tested; the circulating oil injection quantity threshold value table comprises a plurality of monitoring intervals consisting of different rotating speeds and different accelerator opening degrees, and each monitoring interval is provided with a corresponding oil injection quantity threshold value.
In this embodiment, before the threshold table acquisition module 401 executes, it includes: the system comprises a vehicle driving data acquisition module, a threshold value table generation module, an abnormal vehicle monitoring module and a data merging module; the vehicle running data acquisition module is used for selecting a plurality of vehicles with the same vehicle type as the vehicle to be tested and acquiring the running data of each vehicle in the plurality of vehicles; the threshold value table generation module is used for dividing a plurality of monitoring intervals according to the first driving data and preset rotating speed intervals and preset accelerator opening intervals, determining an oil injection quantity threshold value corresponding to each monitoring interval and obtaining an oil injection quantity threshold value table corresponding to the first driving data; wherein the first travel data includes: the running data of each vehicle or the combined running data; the abnormal vehicle monitoring module is used for determining and replacing the running data of the abnormal vehicles according to the oil injection quantity threshold value table corresponding to the running data of each vehicle, and then transferring to the threshold value table generating module until the oil injection quantity threshold value table with the preset quantity is obtained; the data merging module is used for merging the running data of the preset quantity of oil injection quantity threshold value tables to obtain merged running data, transferring the merged running data to the threshold value table generating module to obtain an oil injection quantity threshold value table corresponding to the merged running data, and generating the circulating oil injection quantity threshold value table after abnormal value rejection is carried out on the oil injection quantity threshold value table corresponding to the merged running data.
The driving data obtaining module 402 is configured to obtain a current rotation speed and a current accelerator opening of the vehicle to be tested, and query a first monitoring interval corresponding to the current rotation speed and the current accelerator opening and a first fuel injection amount threshold corresponding to the first monitoring interval in the circulating fuel injection amount threshold table.
The torque identification module 403 is configured to obtain a current fuel injection amount of the vehicle to be tested, and determine that the vehicle to be tested is limited in torsion when the current fuel injection amount is lower than the first fuel injection amount threshold in a preset time period.
According to the invention, the circulating oil injection quantity threshold value table corresponding to the vehicle type of the vehicle to be detected is obtained, and then the monitoring section of the circulating oil injection quantity threshold value table in which the running condition of the vehicle is located is determined according to the current running data of the vehicle to be detected, so that the accuracy of identifying the torque limiting fault is improved, and the torque limiting fault information of the vehicle to be detected can be accurately determined in real time by comparing the oil injection quantity threshold value of the monitoring section with the current oil injection quantity of the vehicle to be detected.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present invention are intended to be included in the scope of the present invention.
Claims (8)
1. A method of identifying a torque limiting state of an engine, comprising:
selecting a plurality of vehicles which are the same as the vehicle type of the vehicle to be tested, and acquiring the running data of each vehicle in the plurality of vehicles;
a threshold value table generation step: dividing a plurality of monitoring intervals according to the first driving data and a preset rotating speed interval and a preset accelerator opening interval, and determining an oil injection quantity threshold value corresponding to each monitoring interval to obtain an oil injection quantity threshold value table corresponding to the first driving data; the first travel data includes: the running data of each vehicle or the combined running data;
according to the oil injection quantity threshold value table corresponding to the running data of each vehicle, after determining and replacing the running data of the abnormal vehicle, turning to the threshold value table generation step until the oil injection quantity threshold value table with the preset quantity is obtained; merging the running data of the preset quantity of oil injection quantity threshold value tables to obtain merged running data, transferring to a threshold value table generation step to obtain an oil injection quantity threshold value table corresponding to the merged running data, and generating a circulating oil injection quantity threshold value table corresponding to the vehicle type of the vehicle to be tested after abnormal value rejection is carried out on the oil injection quantity threshold value table corresponding to the merged running data;
acquiring a circulating oil injection quantity threshold value table corresponding to the vehicle type of the vehicle to be tested; the circulating oil injection quantity threshold value table comprises a plurality of monitoring intervals consisting of different rotating speeds and different accelerator opening degrees, and each monitoring interval is provided with a corresponding oil injection quantity threshold value;
acquiring the current rotating speed and the current accelerator opening of the vehicle to be tested, and inquiring a first monitoring interval corresponding to the current rotating speed and the current accelerator opening and a first oil injection quantity threshold corresponding to the first monitoring interval in the circulating oil injection quantity threshold table;
acquiring the current oil injection quantity of the vehicle to be tested, and determining that the vehicle to be tested is limited to twist when the current oil injection quantity is lower than the first oil injection quantity threshold value in a preset time period; selecting a plurality of monitoring intervals in which the running data quantity of the vehicle to be tested exceeds a second preset data quantity in the circulating oil injection quantity threshold value table; calculating the torque limiting ratio of the plurality of monitoring intervals according to the mode of each of the plurality of monitoring intervals and the oil injection quantity threshold of each of the plurality of monitoring intervals; the torque limiting ratio of the monitoring interval with the largest data quantity in the monitoring intervals is used as the torque limiting ratio of the driving cycle, or the torque limiting ratio of the monitoring interval with the largest accelerator opening in the monitoring intervals is used as the torque limiting ratio of the driving cycle; wherein, the expression of the torque limiting ratio is: torque limiting ratio= (fuel injection amount threshold value of monitoring interval-fuel injection amount mode of monitoring interval)/fuel injection amount threshold value of monitoring interval is 100%.
2. The method for identifying an engine torque limiting state according to claim 1, wherein the steps of dividing a plurality of monitoring intervals according to first driving data according to preset rotating speed intervals and preset accelerator opening intervals, and determining an oil injection quantity threshold value corresponding to each monitoring interval to obtain an oil injection quantity threshold value table corresponding to the first driving data are as follows:
selecting first data meeting a preset rotating speed range and a preset accelerator opening range from the first driving data, and dividing a plurality of monitoring intervals according to preset rotating speed intervals and preset accelerator opening intervals;
removing first data of a preset proportion with the lowest oil injection quantity in each monitoring interval;
when a certain monitoring interval is lower than a preset accelerator opening value, selecting the minimum value of the fuel injection quantity of the residual first data of the certain monitoring interval as a fuel injection quantity threshold value corresponding to the certain monitoring interval;
when a certain monitoring interval is higher than a preset accelerator opening value, selecting the product of the fuel injection quantity mode of the residual first data of the certain monitoring interval and a preset coefficient as a fuel injection quantity threshold value corresponding to the certain monitoring interval.
3. The method for identifying an engine torque limit state according to claim 1, wherein after determining and replacing the driving data of the abnormal vehicle according to the fuel injection amount threshold table corresponding to the driving data of each vehicle, the method goes to the threshold table generating step until a preset number of fuel injection amount threshold tables are obtained, specifically:
acquiring the maximum value of the oil injection quantity threshold value table corresponding to the running data of each vehicle, and calculating the difference value between the maximum value of the oil injection quantity of each vehicle and the maximum value of the oil injection quantity of other vehicles;
when the difference value between the maximum value of the fuel injection quantity of a certain vehicle and the maximum value of the fuel injection quantity of other vehicles is larger than a first preset value, determining that the certain vehicle is an abnormal vehicle, replacing the abnormal vehicle, re-acquiring running data of each vehicle, and transferring to a threshold table generation step until a preset number of fuel injection quantity threshold tables are acquired.
4. The method for identifying an engine torque limit state according to claim 1, wherein the merging of the running data of the preset number of injection quantity threshold tables to obtain merged running data, transferring to a threshold table generating step to obtain an injection quantity threshold table corresponding to the merged running data, and generating the cyclic injection quantity threshold table after outlier rejection of the injection quantity threshold table corresponding to the merged running data is performed, specifically:
combining the original data of the preset quantity of oil injection quantity threshold value tables to obtain combined running data, and then transferring the combined running data to a threshold value table generation step to obtain an oil injection quantity threshold value table corresponding to the combined running data;
replacing the fluctuation oil injection quantity threshold value in the oil injection quantity threshold value table corresponding to the combined driving data with the average value of adjacent oil injection quantities of the fluctuation oil injection quantity threshold value to obtain a tentative threshold value table;
and setting the temporary threshold table as the circulating fuel injection quantity threshold table when each monitoring interval of the temporary threshold table has a corresponding fuel injection quantity threshold.
5. The method for identifying an engine torque limit state according to claim 4, wherein after merging the original data of the preset number of injection quantity threshold tables to obtain merged running data, transferring to a threshold table generating step, obtaining an injection quantity threshold table corresponding to the merged running data, the method comprises:
and when a certain detection section of the temporary threshold table does not have a corresponding fuel injection quantity threshold value, and the running data of the plurality of vehicles reach a first preset data quantity, merging the data of the plurality of vehicles into new merged running data, and transferring to a threshold table generation step.
6. The method for identifying a torque limiting state of an engine according to any one of claims 2 to 5, wherein the running data of each vehicle is running data of each vehicle amount in a preset water temperature range, a preset environmental pressure range, and a preset vehicle speed range.
7. The method for recognizing the engine torque limiter state according to claim 1, wherein the torque limiter ratio of the monitoring section having the largest data amount among the plurality of monitoring sections is set as the torque limiter ratio of the present driving cycle, or the torque limiter ratio of the monitoring section having the largest accelerator opening among the plurality of monitoring sections is set as the torque limiter ratio of the present driving cycle, comprising:
after the stroke of the vehicle to be tested is finished, outputting a first time of determining the starting time of the vehicle to be tested for limiting torsion, a last time of determining the ending time of the vehicle to be tested for limiting torsion, determining the times of the vehicle to be tested for limiting torsion, the total mileage of the vehicle to be tested for limiting torsion, the maximum history of the single time of the vehicle to be tested for limiting torsion, the maximum torsion limiting proportion of the vehicle to be tested and the average torsion limiting proportion of the vehicle to be tested.
8. An identification device for a torque limiting state of an engine, comprising: the system comprises a threshold value table acquisition module, a driving data acquisition module and a torque identification module;
the threshold value table acquisition module is used for acquiring a circulating oil injection quantity threshold value table corresponding to the vehicle type of the vehicle to be tested; the circulating oil injection quantity threshold value table comprises a plurality of monitoring intervals consisting of different rotating speeds and different accelerator opening degrees, and each monitoring interval is provided with a corresponding oil injection quantity threshold value;
before the threshold table acquisition module executes, the method comprises: the system comprises a vehicle driving data acquisition module, a threshold value table generation module, an abnormal vehicle monitoring module and a data merging module; the vehicle running data acquisition module is used for selecting a plurality of vehicles with the same vehicle type as the vehicle to be tested and acquiring the running data of each vehicle in the plurality of vehicles; the threshold value table generation module is used for dividing a plurality of monitoring intervals according to the first driving data and preset rotating speed intervals and preset accelerator opening intervals, determining an oil injection quantity threshold value corresponding to each monitoring interval and obtaining an oil injection quantity threshold value table corresponding to the first driving data; wherein the first travel data includes: the running data of each vehicle or the combined running data; the abnormal vehicle monitoring module is used for determining and replacing the running data of the abnormal vehicles according to the oil injection quantity threshold value table corresponding to the running data of each vehicle, and then transferring to the threshold value table generating module until the oil injection quantity threshold value table with the preset quantity is obtained; the data merging module is used for merging the running data of the preset number of oil injection quantity threshold value tables to obtain merged running data, transferring the merged running data to the threshold value table generation module to obtain an oil injection quantity threshold value table corresponding to the merged running data, and generating the circulating oil injection quantity threshold value table after abnormal value rejection is carried out on the oil injection quantity threshold value table corresponding to the merged running data;
the driving data acquisition module is used for acquiring the current rotating speed and the current accelerator opening of the vehicle to be detected, and inquiring a first monitoring interval corresponding to the current rotating speed and the current accelerator opening and a first fuel injection quantity threshold corresponding to the first monitoring interval in the circulating fuel injection quantity threshold table;
the torque identification module is used for acquiring the current oil injection quantity of the vehicle to be tested, and determining that the vehicle to be tested is limited in torsion when the current oil injection quantity is lower than the first oil injection quantity threshold value in a preset time period; selecting a plurality of monitoring intervals in which the running data quantity of the vehicle to be tested exceeds a second preset data quantity in the circulating oil injection quantity threshold value table; calculating the torque limiting ratio of the plurality of monitoring intervals according to the mode of each of the plurality of monitoring intervals and the oil injection quantity threshold of each of the plurality of monitoring intervals; the torque limiting ratio of the monitoring interval with the largest data quantity in the monitoring intervals is used as the torque limiting ratio of the driving cycle, or the torque limiting ratio of the monitoring interval with the largest accelerator opening in the monitoring intervals is used as the torque limiting ratio of the driving cycle; wherein, the expression of the torque limiting ratio is: torque limiting ratio= (fuel injection amount threshold value of monitoring interval-fuel injection amount mode of monitoring interval)/fuel injection amount threshold value of monitoring interval is 100%.
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