CN114235271B - Dew point detection method and device for differential pressure sensor, storage medium and equipment - Google Patents
Dew point detection method and device for differential pressure sensor, storage medium and equipment Download PDFInfo
- Publication number
- CN114235271B CN114235271B CN202111339401.6A CN202111339401A CN114235271B CN 114235271 B CN114235271 B CN 114235271B CN 202111339401 A CN202111339401 A CN 202111339401A CN 114235271 B CN114235271 B CN 114235271B
- Authority
- CN
- China
- Prior art keywords
- water temperature
- differential pressure
- time point
- engine
- driving cycle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 223
- 238000012544 monitoring process Methods 0.000 claims description 22
- 239000002245 particle Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 17
- 238000012163 sequencing technique Methods 0.000 claims description 4
- 238000005482 strain hardening Methods 0.000 description 9
- 238000001704 evaporation Methods 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000003745 diagnosis Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The application discloses a dew point detection method, a device, a storage medium and equipment of a differential pressure sensor, which are used for acquiring basic delay time corresponding to ambient temperature and marking the basic delay time as target time under the condition that the water temperature of a first engine is not greater than a first preset water temperature threshold value and/or the water temperature of a second engine is not greater than a second preset water temperature threshold value. And determining a reference time point according to the temperature of the exhaust gas outlet position of the DPF, and starting with the reference time point, prolonging the target time to obtain the target time point. The differential pressure acquired during the first time period is identified as an untrusted differential pressure, and the differential pressure acquired during the second time period is identified as a trusted differential pressure. The target time point is determined by using the temperature of the DPF exhaust gas outlet position, the ambient temperature, the first engine water temperature and the second engine water temperature, and the acquired differential pressure in which time period is credible is determined based on the target time point, so that erroneous judgment on the credibility of the differential pressure can be effectively avoided.
Description
Technical Field
The present disclosure relates to the field of dew point detection, and in particular, to a dew point detection method, device, storage medium, and apparatus for a differential pressure sensor.
Background
The differential pressure sensor is mainly used for measuring the differential pressure of two ends of a diesel particle catcher (Diesel Particulate Filter, DPF) carrier, detecting the blocking degree of the DPF in real time, and realizing related diagnosis of the DPF (such as various diagnoses of DPF overload, removal, low efficiency, reliability of the differential pressure sensor and the like). The accuracy of the diagnosis result can be influenced by the sensitivity of the differential pressure sensor, generally, after water molecules in the exhaust gas output to the DPF by the engine are cooled when the engine is stopped, condensed water can be generated on the surface of the differential pressure sensor, the sensitivity of the differential pressure sensor can be reduced by the condensed water, and the differential pressure acquired by the differential pressure sensor generates larger errors. For this reason, how to judge whether the differential pressure is reliable has become an important point.
Currently, the judgment mode of the reliability of the differential pressure is usually dew point detection, namely, when no condensate water coverage on the outer surface of the differential pressure sensor is detected, the differential pressure collected by the differential pressure sensor is determined to be reliable. However, when the differential pressure sensor is in a cold working condition, there are many misjudgments on the judgment result of the differential pressure reliability obtained by using the existing dew point detection mode, that is, the accuracy of the existing dew point detection is lower in the cold working condition.
Disclosure of Invention
The application provides a dew point detection method, a device, a storage medium and equipment of a differential pressure sensor, and aims to accurately detect the dew point under a cold working condition.
In order to achieve the above object, the present application provides the following technical solutions:
a dew point detection method of a differential pressure sensor, comprising:
acquiring monitoring data associated with a current driving cycle; the monitoring data comprise the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle, the ambient temperature of the engine in the current driving cycle, the first engine water temperature and the second engine water temperature; the first engine water temperature is the engine water temperature when the engine is stopped in the last driving cycle; the second engine water temperature is the engine water temperature at the moment of starting the engine in the current driving cycle;
acquiring basic delay time corresponding to the ambient temperature from a first preset data table;
identifying the base delay time as a target time if the first engine water temperature is not greater than a first preset water temperature threshold and/or if the second engine water temperature is not greater than a second preset water temperature threshold;
Determining a reference time point according to the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle;
starting from the reference time point, prolonging the target time to obtain a target time point;
identifying the differential pressure acquired by the differential pressure sensor in a first time period as an unreliable differential pressure, and identifying the differential pressure acquired by the differential pressure sensor in a second time period as a trusted differential pressure; the first time period is as follows: starting from the time point of the current driving cycle on the whole vehicle until the target time point is finished; the second time period is as follows: and starting from the target time point to the time period ending at the time point of the power-down of the whole vehicle in the current driving cycle.
Optionally, the monitoring data further includes a tag of a last driving cycle;
after the basic delay time corresponding to the ambient temperature is obtained from the first preset data table, the method further comprises:
and correcting the basic delay time based on the first engine water temperature and the second engine water temperature under the condition that the value of the tag of the last driving cycle is a first value, the first engine water temperature is larger than the first preset water temperature threshold value, and the second engine water temperature is larger than the second preset water temperature threshold value, so as to obtain the target time.
Optionally, the correcting the basic delay time based on the first engine water temperature and the second engine water temperature to obtain the target time includes:
calculating the difference value between the water temperature of the second engine and the water temperature of the first engine to obtain a water temperature difference;
acquiring a correction coefficient corresponding to the water temperature difference from a second preset data table;
and calculating the product of the basic delay time and the correction coefficient to obtain the target time.
Optionally, the monitoring data further includes a tag of a last driving cycle;
after the basic delay time corresponding to the ambient temperature is obtained from the first preset data table, the method further comprises:
and when the value of the tag of the last driving cycle is a second value, the basic delay time is identified as the target time.
Optionally, starting with the reference time point, extending the target time, and after obtaining the target time point, further includes:
setting a tag for the current driving cycle and setting a value of the tag to a first numerical value when the time point when the engine of the current driving cycle is stopped is determined to be later than the target time point; the label is used for indicating the residual condition of condensed water on the outer surface of the differential pressure sensor when the engine is stopped; if the value of the tag is a first value, the fact that no condensed water remains on the outer surface of the differential pressure sensor when the engine is stopped is indicated.
Optionally, starting with the reference time point, extending the target time, and after obtaining the target time point, further includes:
setting a tag for the current driving cycle and setting the value of the tag to a second value when the time point when the engine of the current driving cycle is stopped is determined to be earlier than the target time point; the label is used for indicating the residual condition of condensed water on the outer surface of the differential pressure sensor when the engine is stopped; and if the value of the label is a second value, the appearance of the differential pressure sensor is still residual with condensed water when the engine is stopped.
Optionally, the determining a reference time point according to the temperature of the exhaust gas outlet position of the diesel particulate trap at any time point of the current driving cycle includes:
obtaining heat of the outer surface of the differential pressure sensor at any time point according to the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle;
the time point with the sequence bit in the time point sequence as the first bit is marked as a reference time point; the time point sequence is obtained by sequencing all time points meeting preset conditions according to the order from the early to the late of time; the preset conditions are as follows: and the heat quantity of the outer surface of the differential pressure sensor at the time point is larger than a preset threshold value.
A dew point detection device of a differential pressure sensor, comprising:
a data acquisition unit for acquiring monitoring data associated with a current driving cycle; the monitoring data comprise the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle, the ambient temperature of the engine in the current driving cycle, the first engine water temperature and the second engine water temperature; the first engine water temperature is the engine water temperature when the engine is stopped in the last driving cycle; the second engine water temperature is the engine water temperature at the moment of starting the engine in the current driving cycle;
the time acquisition unit is used for acquiring basic delay time corresponding to the environment temperature from a first preset data table;
a time determining unit, configured to identify the basic delay time as a target time when the first engine water temperature is not greater than a first preset water temperature threshold and/or when the second engine water temperature is not greater than a second preset water temperature threshold;
a reference determining unit for determining a reference time point according to a temperature of an exhaust gas outlet position of the diesel particulate trap at an arbitrary time point of the current driving cycle;
The time extension unit is used for extending the target time by taking the reference time point as the start to obtain a target time point;
the differential pressure judging unit is used for identifying the differential pressure acquired by the differential pressure sensor in a first time period as an unreliable differential pressure and identifying the differential pressure acquired by the differential pressure sensor in a second time period as a trusted differential pressure; the first time period is as follows: the time period starts from the power-on time point of the whole vehicle to the end of the target time point; the second time period is as follows: and starting from the target time point to the time period ending at the time point of the power-down of the whole vehicle in the current driving cycle.
A computer-readable storage medium comprising a stored program, wherein the program performs the dew point detection method of the differential pressure sensor.
A dew point detection apparatus of a differential pressure sensor, comprising: a processor, a memory, and a bus; the processor is connected with the memory through the bus;
the memory is used for storing a program, and the processor is used for running the program, wherein the program runs to execute the dew point detection method of the differential pressure sensor.
According to the technical scheme, the monitoring data related to the current driving cycle are obtained, and the basic delay time corresponding to the ambient temperature is obtained from the first preset data table. And identifying the basic delay time as the target time under the condition that the first engine water temperature is not greater than a first preset water temperature threshold value and/or the second engine water temperature is not greater than a second preset water temperature threshold value. And determining a reference time point according to the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle. Starting from the reference time point, the target time is prolonged, and the target time point is obtained. The differential pressure acquired by the differential pressure sensor in the first time period is identified as an unreliable differential pressure, and the differential pressure acquired by the differential pressure sensor in the second time period is identified as a reliable differential pressure. The temperature of the DPF exhaust gas outlet position, the ambient temperature, the first engine water temperature and the second engine water temperature are utilized to determine a target time point, and the pressure difference which is acquired in the current driving cycle in which time period is reliable is determined based on the target time point. Therefore, by utilizing the scheme disclosed by the application, the accuracy of dew point detection under the cold working condition can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1a is a schematic flow chart of a dew point detection method of a differential pressure sensor according to an embodiment of the present application;
fig. 1b is a schematic flow chart of a dew point detection method of a differential pressure sensor according to an embodiment of the present application;
FIG. 2 is a flow chart of another dew point detection method of a differential pressure sensor according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a dew point detecting device of a differential pressure sensor according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The reason that the accuracy of the detection result is lower in the existing dew point detection mode under the cold working condition is as follows: in the existing dew point detection mode, whether the condensed water remains on the outer surface of the differential pressure sensor is generally judged by utilizing the heat on the outer surface of the differential pressure sensor, specifically, if the heat is larger than a preset threshold, the condensed water is determined to have enough heat to realize endothermic evaporation, therefore, when the heat at a certain time point is monitored to be larger than the preset threshold, the differential pressure acquired by the differential pressure sensor after the time point is considered to be credible, the differential pressure acquired before the time point is not credible, however, under the cold working condition, the condensed water on the outer surface of the differential pressure sensor may be frozen, more heat is absorbed by the frozen condensed water in evaporation than the heat absorbed in the ordinary liquid state, therefore, when the heat at the certain time point is monitored to be larger than the preset threshold, the time point at which the frozen condensed water is directly considered to be completely evaporated is not accurate enough, and under the actual condition, the frozen condensed water still remains on the outer surface of the differential pressure sensor at the time point is extremely likely to be credible, so that the error judgment on the differential pressure is further caused.
Based on the above, the embodiment of the application provides a dew point detection method of a differential pressure sensor.
As shown in fig. 1a and fig. 1b, a flow chart of a dew point detection method of a differential pressure sensor according to an embodiment of the present application includes the following steps:
s101: and acquiring the temperature of the exhaust gas outlet position of the DPF at any time point of the current driving cycle, the ambient temperature of the current driving cycle when the engine is started, the first engine water temperature, the second engine water temperature and the label of the last driving cycle.
The driving cycle is used for indicating the process from the power-on of the whole vehicle to the power-off of the whole vehicle. In addition, the driving cycle also comprises an engine starting link and an engine stopping link. The first engine water temperature is the engine water temperature when the engine of the previous driving cycle is stopped, and the second engine water temperature is the engine water temperature at the moment of starting the engine of the current driving cycle.
The temperature of the exhaust gas outlet position of the DPF at any time point of the current driving cycle may be acquired by a temperature sensor preset at the exhaust gas outlet position of the DPF. In practice, a differential pressure sensor is also typically installed at the exhaust outlet location of the DPF.
The ambient temperature when the engine is started can be acquired by a temperature sensor preset on the engine. The first engine water temperature and the second engine water temperature can be acquired by a water temperature sensor preset in an engine cooling system and recorded in an electronic control unit (Electronic Control Unit, ECU) of the whole vehicle.
A tag for a driving cycle for indicating the residual condition of condensed water on the outer surface of the differential pressure sensor when the engine is stopped. If the value of the label is the first value, the condition that no condensed water remains on the outer surface of the differential pressure sensor when the engine is stopped is indicated. If the value of the label is the second value, the condensed water still remains on the outer surface of the differential pressure sensor when the engine is stopped. The first value and the second value are different from each other, and specifically, the first value may be set to 1 and the second value may be set to 0.
It is emphasized that for a first driving cycle of the current driving cycle, the first engine water temperature is equal to the second engine water temperature, and the value of the tag of the last driving cycle is defaulted to the second value.
S102: and acquiring basic delay time corresponding to the ambient temperature from the first preset data table.
Wherein, the environment temperature is inversely related to the basic delay time, i.e. the lower the environment temperature is, the larger the basic delay time is.
S103: and calculating the difference value between the second engine water temperature and the first engine water temperature to obtain a water temperature difference when the value of the tag in the previous driving cycle is a first value and the first engine water temperature is larger than a first preset water temperature threshold and the second engine water temperature is larger than a second preset water temperature threshold.
And if the value of the tag of the previous driving cycle is a first value, the first engine water temperature is greater than a first preset water temperature threshold value, and the second engine water temperature is greater than a second preset water temperature threshold value, the condensed water which represents that the appearance of the differential pressure sensor is frozen is not much.
S104: and acquiring a correction coefficient corresponding to the water temperature difference from the second preset data table.
The water temperature difference is in direct proportion to the correction coefficient, namely, the smaller the water temperature difference is, the smaller the correction coefficient is.
S105: and calculating the product of the basic delay time and the correction coefficient to obtain the target time.
After S105 is performed, S108 is continued.
In general, calculating the product of the base delay time and the correction coefficient to obtain the target time is essentially to adjust the base delay time, which can be understood as shortening the base delay time.
S106: and when the value of the tag of the previous driving cycle is the second value, the basic delay time is identified as the target time.
After S106 is performed, S108 is continued.
If the value of the label of the previous driving cycle is the second value, more frozen condensed water still remains on the outer surface of the differential pressure sensor, therefore, the basic delay time is not required to be adjusted, namely, the condensed water on the outer surface of the current differential pressure sensor is determined to be not completely evaporated, and the longer delay time is required to absorb heat to realize complete evaporation.
S107: and identifying the basic delay time as the target time under the condition that the first engine water temperature is not greater than a first preset water temperature threshold value and/or the second engine water temperature is not greater than a second preset water temperature threshold value.
After S107 is performed, S108 is continued.
If the first engine water temperature is not greater than the first preset water temperature threshold value, and/or if the second engine water temperature is not greater than the second preset water temperature threshold value, more frozen condensed water remains on the outer surface of the differential pressure sensor, so that the basic delay time is not required to be adjusted, that is, the condensed water on the outer surface of the current differential pressure sensor is determined to be not completely evaporated, and the heat is required to be absorbed for a long time to realize complete evaporation.
S108: and obtaining heat corresponding to the temperature of the exhaust gas outlet position of the DPF at any time point of the current driving cycle from a third preset data table, and identifying the heat corresponding to each time point as the heat of the outer surface of the differential pressure sensor at each time point.
The condensed water (solid and liquid) evaporates into gaseous water, heat needs to be absorbed, and the heat absorbed by the condensed water is the heat of the outer surface of the differential pressure sensor, so that whether the condensed water evaporates can be judged by determining the heat absorbed by the condensed water.
S109: and marking the time point with the sequence bit as the first bit in the time point sequence as a reference time point.
The time point sequence is obtained based on ordering all time points meeting preset conditions, and the preset conditions are as follows: at this point in time the heat of the exterior of the differential pressure sensor is greater than a preset threshold.
For the existing dew point detection method, when the heat quantity is larger than a preset threshold value, the condensed water representing the appearance of the differential pressure sensor is completely evaporated. However, when the whole vehicle (i.e., the differential pressure sensor) is in a cold condition, it is not accurate enough to determine that the condensed water has evaporated completely, because: in cold conditions, the condensed water will freeze (i.e. solid water), and compared with ordinary liquid water, the amount of heat required for evaporating the solid water into gaseous water is significantly higher than that of ordinary liquid water, so that the time point when the amount of heat is greater than the preset heat threshold (i.e. the time point when the differential pressure sensor collects the differential pressure) is not the time point when the condensed water is completely evaporated, i.e. the differential pressure sensor may further have frozen condensed water, and the differential pressure collected at the time point is not credible.
The flow shown in S108 to S109 may be summarized as follows: and determining a reference time point according to the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle. Generally, the flow shown in S108 to S109 belongs to a common means for the existing dew point detection method.
S110: starting from the reference time point, the target time is prolonged, and the target time point is obtained.
S111: and judging whether the time point of stopping the engine of the current driving cycle is later than the target time point.
If the point in time of the engine stop of the previous driving cycle is later than the target point in time, S112 is executed, otherwise S114 is executed.
S112: and setting a label for the current driving cycle, and setting the value of the label of the current driving cycle as a first numerical value.
After S112 is performed, S113 is continued.
If the time point of stopping the engine of the current driving cycle is later than the target time point, it is determined that the condensed water on the outer surface of the differential pressure sensor is completely evaporated when the engine of the current driving cycle is stopped, that is, the condensed water is not remained on the outer surface of the differential pressure sensor, so that the value of the label of the current driving cycle is set to be a first value.
S113: the differential pressure acquired by the differential pressure sensor in the first time period is identified as an unreliable differential pressure, and the differential pressure acquired by the differential pressure sensor in the second time period is identified as a reliable differential pressure.
Wherein, the first time period is: and a time period from the power-on time point of the whole vehicle to the end of the target time point. The second time period is as follows: and starting from the target time point, and ending the time period until the time point of the power-down of the whole vehicle in the current driving cycle.
Generally, the pressure difference collected by the pressure difference sensor in the first time period cannot be determined that the condensed water on the surface of the pressure difference sensor has evaporated completely, so the pressure difference collected in the first time period is identified as an unreliable pressure difference.
Because the second time period is a time period from the target time point to the end of the time point when the whole vehicle is powered down in the current driving cycle, the condensed water on the outer surface of the differential pressure sensor is clearly considered to be completely evaporated, that is, the condensed water is not remained on the outer surface of the differential pressure sensor, so that the differential pressure acquired in the second time period is determined to be credible.
S114: and setting a label for the current driving cycle, and setting the value of the label of the current driving cycle to be a second numerical value.
After S114 is performed, S113 is continued.
If the time point of stopping the engine of the current driving cycle is earlier than the target time point, determining that the condensed water on the outer surface of the differential pressure sensor is not completely evaporated when the engine of the current driving cycle is stopped, namely, the condensed water remains on the outer surface of the differential pressure sensor, and setting the value of the label of the current driving cycle as a second value.
In summary, the temperature of the exhaust gas outlet of the DPF, the ambient temperature, the first engine water temperature and the second engine water temperature are used to determine the target time point, and based on the target time point, the pressure difference acquired in which time period in the current driving cycle is reliable. Therefore, by using the scheme of the embodiment, the accuracy of dew point detection under the cold working condition can be improved.
It should be noted that S101 mentioned in the foregoing embodiment is an alternative implementation of the dew point detection method of the differential pressure sensor in the embodiment of the present application. In addition, S112 mentioned in the foregoing embodiment is also an optional implementation manner of the dew point detection method of the differential pressure sensor in the embodiment of the present application. For this reason, the procedure mentioned in the above embodiment can be summarized as the method described in fig. 2.
As shown in fig. 2, a flow chart of another dew point detection method of a differential pressure sensor according to an embodiment of the present application includes the following steps:
s201: monitoring data associated with a current driving cycle is acquired.
The monitoring data comprise the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle, the ambient temperature of the engine in the current driving cycle, the first engine water temperature and the second engine water temperature; the first engine water temperature is the engine water temperature when the engine is stopped in the last driving cycle; the second engine water temperature is the engine water temperature at the moment of starting the engine in the current driving cycle.
S202: and acquiring basic delay time corresponding to the ambient temperature from the first preset data table.
S203: and identifying the basic delay time as the target time under the condition that the first engine water temperature is not greater than a first preset water temperature threshold value and/or the second engine water temperature is not greater than a second preset water temperature threshold value.
S204: and determining a reference time point according to the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle.
S205: starting from the reference time point, the target time is prolonged, and the target time point is obtained.
S206: the differential pressure acquired by the differential pressure sensor in the first time period is identified as an unreliable differential pressure, and the differential pressure acquired by the differential pressure sensor in the second time period is identified as a reliable differential pressure.
Wherein, the first time period is: a time period from the power-on time point of the whole vehicle to the end of the target time point; the second time period is as follows: and starting from the target time point, and ending the time period until the time point of the power-down of the whole vehicle in the current driving cycle.
In summary, the temperature of the exhaust gas outlet of the DPF, the ambient temperature, the first engine water temperature and the second engine water temperature are used to determine the target time point, and based on the target time point, the pressure difference acquired in which time period in the current driving cycle is reliable. Therefore, by using the scheme of the embodiment, the accuracy of dew point detection under the cold working condition can be improved.
Corresponding to the dew point detection method of the differential pressure sensor provided by the application, the application also provides a dew point detection device of the differential pressure sensor.
As shown in fig. 3, an architecture diagram of a dew point detection device of a differential pressure sensor according to an embodiment of the present application includes:
a data acquisition unit 100 for acquiring monitoring data associated with a current driving cycle; the monitoring data comprise the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle, the ambient temperature of the engine in the current driving cycle, the first engine water temperature and the second engine water temperature; the first engine water temperature is the engine water temperature when the engine is stopped in the last driving cycle; the second engine water temperature is the engine water temperature at the moment of starting the engine in the current driving cycle.
In addition, the monitoring data also includes a tag of the last driving cycle.
The time acquisition unit 200 is configured to acquire a basic delay time corresponding to the ambient temperature from the first preset data table.
The time determining unit 300 is configured to identify the basic delay time as the target time in a case where the first engine water temperature is not greater than a first preset water temperature threshold and/or the second engine water temperature is not greater than a second preset water temperature threshold.
Wherein the time determining unit 300 is further configured to: and when the value of the tag in the previous driving cycle is a first value, and the first engine water temperature is larger than a first preset water temperature threshold value and the second engine water temperature is larger than a second preset water temperature threshold value, correcting the basic delay time based on the first engine water temperature and the second engine water temperature to obtain the target time.
The time determination unit 300 specifically functions to: calculating the difference value between the water temperature of the second engine and the water temperature of the first engine to obtain a water temperature difference; acquiring a correction coefficient corresponding to the water temperature difference from a second preset data table; and calculating the product of the basic delay time and the correction coefficient to obtain the target time.
The time determination unit 300 is further configured to: and when the value of the tag of the previous driving cycle is the second value, the basic delay time is identified as the target time.
A reference determining unit 400 for determining a reference time point according to the temperature of the exhaust gas outlet position of the diesel particulate trap at an arbitrary time point of the current driving cycle.
The reference determining unit 400 is specifically configured to: according to the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle, obtaining the heat of the outer surface of the differential pressure sensor at any time point; the time point with the sequence bit in the time point sequence as the first bit is marked as a reference time point; the time point sequence is obtained by sequencing all time points meeting preset conditions according to the order from the early to the late of time; the preset conditions are as follows: the heat of the outer surface of the differential pressure sensor at the time point is larger than a preset threshold value.
The time extension unit 500 is configured to extend the target time with the reference time point as the start, and obtain the target time point.
The differential pressure discriminating unit 600 is configured to identify a differential pressure acquired by the differential pressure sensor in a first period as an unreliable differential pressure, and identify a differential pressure acquired by the differential pressure sensor in a second period as a trusted differential pressure; the first time period is: a time period from the power-on time point of the whole vehicle to the end of the target time point; the second time period is as follows: and starting from the target time point, and ending the time period until the time point of the power-down of the whole vehicle in the current driving cycle.
A tag setting unit 700 configured to set a tag for a current driving cycle and set a value of the tag to a first value, in a case where it is determined that a time point at which the engine of the current driving cycle is stopped is later than a target time point; the label is used for indicating the residual condition of condensed water on the outer surface of the differential pressure sensor when the engine is stopped; if the value of the label is the first value, the condition that no condensed water remains on the outer surface of the differential pressure sensor when the engine is stopped is indicated.
The tag setting unit 700 is further configured to: setting a tag for the current driving cycle and setting the value of the tag to be a second value when the time point of stopping the engine of the current driving cycle is determined to be earlier than the target time point; the label is used for indicating the residual condition of condensed water on the outer surface of the differential pressure sensor when the engine is stopped; if the value of the label is the second value, the condensed water still remains on the outer surface of the differential pressure sensor when the engine is stopped.
In summary, the temperature of the exhaust gas outlet of the DPF, the ambient temperature, the first engine water temperature and the second engine water temperature are used to determine the target time point, and based on the target time point, the pressure difference acquired in which time period in the current driving cycle is reliable. Therefore, by using the scheme of the embodiment, the accuracy of dew point detection under the cold working condition can be improved.
The application also provides a computer readable storage medium, wherein the computer readable storage medium comprises a stored program, and the program executes the dew point detection method of the differential pressure sensor.
The application also provides a dew point detection device of a differential pressure sensor, comprising: a processor, a memory, and a bus. The processor is connected with the memory through a bus, the memory is used for storing a program, and the processor is used for running the program, wherein the dew point detection method of the differential pressure sensor provided by the application is executed when the program runs, and comprises the following steps:
acquiring monitoring data associated with a current driving cycle; the monitoring data comprise the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle, the ambient temperature of the engine in the current driving cycle, the first engine water temperature and the second engine water temperature; the first engine water temperature is the engine water temperature when the engine is stopped in the last driving cycle; the second engine water temperature is the engine water temperature at the moment of starting the engine in the current driving cycle;
Acquiring basic delay time corresponding to the ambient temperature from a first preset data table;
identifying the base delay time as a target time if the first engine water temperature is not greater than a first preset water temperature threshold and/or if the second engine water temperature is not greater than a second preset water temperature threshold;
determining a reference time point according to the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle;
starting from the reference time point, prolonging the target time to obtain a target time point;
identifying the differential pressure acquired by the differential pressure sensor in a first time period as an unreliable differential pressure, and identifying the differential pressure acquired by the differential pressure sensor in a second time period as a trusted differential pressure; the first time period is as follows: starting from the time point of the current driving cycle on the whole vehicle until the target time point is finished; the second time period is as follows: and starting from the target time point to the time period ending at the time point of the power-down of the whole vehicle in the current driving cycle.
Specifically, on the basis of the above embodiment, the monitoring data further includes a tag of a previous driving cycle;
After the basic delay time corresponding to the ambient temperature is obtained from the first preset data table, the method further comprises:
and correcting the basic delay time based on the first engine water temperature and the second engine water temperature under the condition that the value of the tag of the last driving cycle is a first value, the first engine water temperature is larger than the first preset water temperature threshold value, and the second engine water temperature is larger than the second preset water temperature threshold value, so as to obtain the target time.
Specifically, on the basis of the foregoing embodiment, the correcting the basic delay time based on the first engine water temperature and the second engine water temperature to obtain the target time includes:
calculating the difference value between the water temperature of the second engine and the water temperature of the first engine to obtain a water temperature difference;
acquiring a correction coefficient corresponding to the water temperature difference from a second preset data table;
and calculating the product of the basic delay time and the correction coefficient to obtain the target time.
Specifically, on the basis of the above embodiment, the monitoring data further includes a tag of a previous driving cycle;
after the basic delay time corresponding to the ambient temperature is obtained from the first preset data table, the method further comprises:
And when the value of the tag of the last driving cycle is a second value, the basic delay time is identified as the target time.
Specifically, on the basis of the foregoing embodiment, starting with the reference time point, extending the target time, and after obtaining the target time point, further includes:
setting a tag for the current driving cycle and setting a value of the tag to a first numerical value when the time point when the engine of the current driving cycle is stopped is determined to be later than the target time point; the label is used for indicating the residual condition of condensed water on the outer surface of the differential pressure sensor when the engine is stopped; if the value of the tag is a first value, the fact that no condensed water remains on the outer surface of the differential pressure sensor when the engine is stopped is indicated.
Specifically, on the basis of the foregoing embodiment, starting with the reference time point, extending the target time, and after obtaining the target time point, further includes:
setting a tag for the current driving cycle and setting the value of the tag to a second value when the time point when the engine of the current driving cycle is stopped is determined to be earlier than the target time point; the label is used for indicating the residual condition of condensed water on the outer surface of the differential pressure sensor when the engine is stopped; and if the value of the label is a second value, the appearance of the differential pressure sensor is still residual with condensed water when the engine is stopped.
Specifically, on the basis of the above embodiment, the determining, according to the temperature of the exhaust gas outlet position of the diesel particulate trap at any time point of the current driving cycle, a reference time point includes:
obtaining heat of the outer surface of the differential pressure sensor at any time point according to the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle;
the time point with the sequence bit in the time point sequence as the first bit is marked as a reference time point; the time point sequence is obtained by sequencing all time points meeting preset conditions according to the order from the early to the late of time; the preset conditions are as follows: and the heat quantity of the outer surface of the differential pressure sensor at the time point is larger than a preset threshold value.
The functions described in the methods of the present application, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computing device readable storage medium. Based on such understanding, a portion of the embodiments of the present application that contributes to the prior art or a portion of the technical solution may be embodied in the form of a software product stored in a storage medium, comprising several instructions for causing a computing device (which may be a personal computer, a server, a mobile computing device or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, so that the same or similar parts between the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A dew point detection method of a differential pressure sensor, comprising:
acquiring monitoring data associated with a current driving cycle; the monitoring data comprise the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle, the ambient temperature of the engine in the current driving cycle, the first engine water temperature and the second engine water temperature; the first engine water temperature is the engine water temperature when the engine is stopped in the last driving cycle; the second engine water temperature is the engine water temperature at the moment of starting the engine in the current driving cycle;
Acquiring basic delay time corresponding to the ambient temperature from a first preset data table;
identifying the base delay time as a target time if the first engine water temperature is not greater than a first preset water temperature threshold and/or if the second engine water temperature is not greater than a second preset water temperature threshold;
determining a reference time point according to the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle;
starting from the reference time point, prolonging the target time to obtain a target time point;
identifying the differential pressure acquired by the differential pressure sensor in a first time period as an unreliable differential pressure, and identifying the differential pressure acquired by the differential pressure sensor in a second time period as a trusted differential pressure; the first time period is as follows: starting from the time point of the current driving cycle on the whole vehicle until the target time point is finished; the second time period is as follows: and starting from the target time point to the time period ending at the time point of the power-down of the whole vehicle in the current driving cycle.
2. The method of claim 1, wherein the monitoring data further comprises a tag of a last driving cycle;
After the basic delay time corresponding to the ambient temperature is obtained from the first preset data table, the method further comprises:
and correcting the basic delay time based on the first engine water temperature and the second engine water temperature under the condition that the value of the tag of the last driving cycle is a first value, the first engine water temperature is larger than the first preset water temperature threshold value, and the second engine water temperature is larger than the second preset water temperature threshold value, so as to obtain the target time.
3. The method of claim 2, wherein the correcting the base delay time based on the first engine water temperature and the second engine water temperature to obtain the target time comprises:
calculating the difference value between the water temperature of the second engine and the water temperature of the first engine to obtain a water temperature difference;
acquiring a correction coefficient corresponding to the water temperature difference from a second preset data table;
and calculating the product of the basic delay time and the correction coefficient to obtain the target time.
4. The method of claim 1, wherein the monitoring data further comprises a tag of a last driving cycle;
After the basic delay time corresponding to the ambient temperature is obtained from the first preset data table, the method further comprises:
and when the value of the tag of the last driving cycle is a second value, the basic delay time is identified as the target time.
5. The method of claim 1, wherein starting with the reference time point, extending the target time to obtain a target time point, further comprising:
setting a tag for the current driving cycle and setting a value of the tag to a first numerical value when the time point when the engine of the current driving cycle is stopped is determined to be later than the target time point; the label is used for indicating the residual condition of condensed water on the outer surface of the differential pressure sensor when the engine is stopped; if the value of the tag is a first value, the fact that no condensed water remains on the outer surface of the differential pressure sensor when the engine is stopped is indicated.
6. The method of claim 1, wherein starting with the reference time point, extending the target time to obtain a target time point, further comprising:
Setting a tag for the current driving cycle and setting the value of the tag to a second value when the time point when the engine of the current driving cycle is stopped is determined to be earlier than the target time point; the label is used for indicating the residual condition of condensed water on the outer surface of the differential pressure sensor when the engine is stopped; and if the value of the label is a second value, the appearance of the differential pressure sensor is still residual with condensed water when the engine is stopped.
7. The method of claim 1, wherein determining a reference point in time based on the temperature of the exhaust gas outlet location of the diesel particulate trap at any point in time of the current driving cycle comprises:
obtaining heat of the outer surface of the differential pressure sensor at any time point according to the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle;
the time point with the sequence bit in the time point sequence as the first bit is marked as a reference time point; the time point sequence is obtained by sequencing all time points meeting preset conditions according to the order from the early to the late of time; the preset conditions are as follows: and the heat quantity of the outer surface of the differential pressure sensor at the time point is larger than a preset threshold value.
8. A dew point detection device of a differential pressure sensor, comprising:
a data acquisition unit for acquiring monitoring data associated with a current driving cycle; the monitoring data comprise the temperature of the exhaust gas outlet position of the diesel particle catcher at any time point of the current driving cycle, the ambient temperature of the engine in the current driving cycle, the first engine water temperature and the second engine water temperature; the first engine water temperature is the engine water temperature when the engine is stopped in the last driving cycle; the second engine water temperature is the engine water temperature at the moment of starting the engine in the current driving cycle;
the time acquisition unit is used for acquiring basic delay time corresponding to the environment temperature from a first preset data table;
a time determining unit, configured to identify the basic delay time as a target time when the first engine water temperature is not greater than a first preset water temperature threshold and/or when the second engine water temperature is not greater than a second preset water temperature threshold;
a reference determining unit for determining a reference time point according to a temperature of an exhaust gas outlet position of the diesel particulate trap at an arbitrary time point of the current driving cycle;
The time extension unit is used for extending the target time by taking the reference time point as the start to obtain a target time point;
the differential pressure judging unit is used for identifying the differential pressure acquired by the differential pressure sensor in a first time period as an unreliable differential pressure and identifying the differential pressure acquired by the differential pressure sensor in a second time period as a trusted differential pressure; the first time period is as follows: starting from the time point of the current driving cycle on the whole vehicle until the target time point is finished; the second time period is as follows: and starting from the target time point to the time period ending at the time point of the power-down of the whole vehicle in the current driving cycle.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the program performs the dew point detection method of the differential pressure sensor according to any one of claims 1 to 7.
10. A dew point detection apparatus of a differential pressure sensor, comprising: a processor, a memory, and a bus; the processor is connected with the memory through the bus;
the memory is used for storing a program, and the processor is used for running the program, wherein the program runs to execute the dew point detection method of the differential pressure sensor according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111339401.6A CN114235271B (en) | 2021-11-12 | 2021-11-12 | Dew point detection method and device for differential pressure sensor, storage medium and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111339401.6A CN114235271B (en) | 2021-11-12 | 2021-11-12 | Dew point detection method and device for differential pressure sensor, storage medium and equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114235271A CN114235271A (en) | 2022-03-25 |
| CN114235271B true CN114235271B (en) | 2024-01-12 |
Family
ID=80749273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111339401.6A Active CN114235271B (en) | 2021-11-12 | 2021-11-12 | Dew point detection method and device for differential pressure sensor, storage medium and equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114235271B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115202410B (en) * | 2022-08-04 | 2023-12-15 | 潍柴动力股份有限公司 | Method and device for determining dew point detection time of vehicle |
Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07224636A (en) * | 1994-02-10 | 1995-08-22 | Nippon Soken Inc | Exhaust emission control device for internal combustion engine |
| JP2009187794A (en) * | 2008-02-06 | 2009-08-20 | Honda Motor Co Ltd | Fuel cell system and method of controlling the same |
| CN101568702A (en) * | 2007-10-04 | 2009-10-28 | 日立建机株式会社 | Exhaust gas purification system of diesel engine |
| JP2011169235A (en) * | 2010-02-18 | 2011-09-01 | Isuzu Motors Ltd | Method for controlling dpf regeneration |
| CN102620884A (en) * | 2012-03-30 | 2012-08-01 | 潍柴动力股份有限公司 | Equipment and method for detecting cylinder pressure |
| CN103017974A (en) * | 2011-09-26 | 2013-04-03 | 上海洛丁森工业自动化设备有限公司 | Novel transmissible pressure and differential pressure transmitter for measuring pressure of ultrahigh temperature medium |
| CN106525154A (en) * | 2016-09-30 | 2017-03-22 | 张英志 | Measurement device for tail gas flow exhausted by car under actual driving condition |
| CN107076628A (en) * | 2014-09-24 | 2017-08-18 | 精工电子有限公司 | Pressure change determines device, elevation measurement device and pressure change assay method |
| CN109297618A (en) * | 2018-09-30 | 2019-02-01 | 潍柴动力股份有限公司 | A kind of method and device detecting insincere property |
| CN209841266U (en) * | 2019-06-17 | 2019-12-24 | 上海盛剑环境系统科技股份有限公司 | Differential pressure transmitting device |
| CN111164293A (en) * | 2017-10-30 | 2020-05-15 | 洋马株式会社 | Control device for internal combustion engine |
| CN111692022A (en) * | 2020-07-06 | 2020-09-22 | 广西玉柴机器股份有限公司 | Natural gas engine EGR flowmeter mounting seat with electric auxiliary heating |
| CN112324541A (en) * | 2020-10-20 | 2021-02-05 | 同济大学 | A biofuel diesel engine particle trap regeneration system and control method |
| CN112362194A (en) * | 2020-11-02 | 2021-02-12 | 潍柴动力股份有限公司 | Sensor detection method and device |
| CN112924308A (en) * | 2021-02-04 | 2021-06-08 | 中车齐齐哈尔车辆有限公司 | Load spectrum acquisition method and device, computer readable storage medium and equipment |
| CN112943411A (en) * | 2021-03-12 | 2021-06-11 | 潍柴动力股份有限公司 | DPF system, control method and device |
| CN113176050A (en) * | 2021-05-07 | 2021-07-27 | 潍柴动力股份有限公司 | Air leakage detection method and device for engine aftertreatment and exhaust pipeline |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2039939B2 (en) * | 2007-09-20 | 2020-11-18 | Grundfos Management A/S | Method for monitoring an energy conversion device |
| EP2637007B1 (en) * | 2012-03-08 | 2020-01-22 | ams international AG | MEMS capacitive pressure sensor |
-
2021
- 2021-11-12 CN CN202111339401.6A patent/CN114235271B/en active Active
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07224636A (en) * | 1994-02-10 | 1995-08-22 | Nippon Soken Inc | Exhaust emission control device for internal combustion engine |
| CN101568702A (en) * | 2007-10-04 | 2009-10-28 | 日立建机株式会社 | Exhaust gas purification system of diesel engine |
| JP2009187794A (en) * | 2008-02-06 | 2009-08-20 | Honda Motor Co Ltd | Fuel cell system and method of controlling the same |
| JP2011169235A (en) * | 2010-02-18 | 2011-09-01 | Isuzu Motors Ltd | Method for controlling dpf regeneration |
| CN103017974A (en) * | 2011-09-26 | 2013-04-03 | 上海洛丁森工业自动化设备有限公司 | Novel transmissible pressure and differential pressure transmitter for measuring pressure of ultrahigh temperature medium |
| CN102620884A (en) * | 2012-03-30 | 2012-08-01 | 潍柴动力股份有限公司 | Equipment and method for detecting cylinder pressure |
| CN107076628A (en) * | 2014-09-24 | 2017-08-18 | 精工电子有限公司 | Pressure change determines device, elevation measurement device and pressure change assay method |
| CN106525154A (en) * | 2016-09-30 | 2017-03-22 | 张英志 | Measurement device for tail gas flow exhausted by car under actual driving condition |
| CN111164293A (en) * | 2017-10-30 | 2020-05-15 | 洋马株式会社 | Control device for internal combustion engine |
| CN109297618A (en) * | 2018-09-30 | 2019-02-01 | 潍柴动力股份有限公司 | A kind of method and device detecting insincere property |
| CN209841266U (en) * | 2019-06-17 | 2019-12-24 | 上海盛剑环境系统科技股份有限公司 | Differential pressure transmitting device |
| CN111692022A (en) * | 2020-07-06 | 2020-09-22 | 广西玉柴机器股份有限公司 | Natural gas engine EGR flowmeter mounting seat with electric auxiliary heating |
| CN112324541A (en) * | 2020-10-20 | 2021-02-05 | 同济大学 | A biofuel diesel engine particle trap regeneration system and control method |
| CN112362194A (en) * | 2020-11-02 | 2021-02-12 | 潍柴动力股份有限公司 | Sensor detection method and device |
| CN112924308A (en) * | 2021-02-04 | 2021-06-08 | 中车齐齐哈尔车辆有限公司 | Load spectrum acquisition method and device, computer readable storage medium and equipment |
| CN112943411A (en) * | 2021-03-12 | 2021-06-11 | 潍柴动力股份有限公司 | DPF system, control method and device |
| CN113176050A (en) * | 2021-05-07 | 2021-07-27 | 潍柴动力股份有限公司 | Air leakage detection method and device for engine aftertreatment and exhaust pipeline |
Non-Patent Citations (1)
| Title |
|---|
| 《颗粒捕集器压差传感器位置的试验研究》;马崇银，黄维，阳灿;《装备制造技术》;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114235271A (en) | 2022-03-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20060218895A1 (en) | Method for operating an internal combustion engine and device for executing the method | |
| US20100313629A1 (en) | Preventing Soot Underestimation in Diesel Particulate Filters by Determining the Restriction Sensitivity of Soot | |
| CN113418655B (en) | Pressure difference sensor fault detection method and system, storage medium and electronic equipment | |
| US8201443B2 (en) | Systems and methods for monitoring catalyst device integrity | |
| CN110608106B (en) | Temperature processing method and device | |
| JP2016156357A (en) | Abnormality determination system for exhaust device | |
| CN110132381A (en) | Venturi differential pressure sensor reliability diagnosis method and device | |
| CN111636954B (en) | Heavy diesel vehicle and engine aftertreatment anti-cheating method and system thereof | |
| CN114235271B (en) | Dew point detection method and device for differential pressure sensor, storage medium and equipment | |
| CN112412600B (en) | Method, device and equipment for monitoring trapping efficiency of particle trap and storage medium | |
| CN113107656B (en) | Dew point passing identification method of Nox sensor | |
| CN110872996A (en) | Icing detection method and device for pressure type intake flow sensor | |
| CN113176050A (en) | Air leakage detection method and device for engine aftertreatment and exhaust pipeline | |
| CN103403318A (en) | Method for detecting the failure of a charge air cooler | |
| CN112380707A (en) | Method and device for evaluating cooling performance of EGR cooler and electronic equipment | |
| US20090199544A1 (en) | Method and system for combustion engine particulate filter regeneration | |
| JP2007537913A (en) | Apparatus and method for monitoring the filling level of a coolant circuit of a vehicle air conditioning system | |
| JP2007092760A (en) | Coolant temperature estimating device for internal combustion engine | |
| CN113266477B (en) | Engine downtime checking method and device | |
| CN118008601A (en) | Air inlet system fault judging method, device, equipment and storage medium | |
| CN116928913A (en) | Method and device for detecting refrigerant quantity of automobile air conditioner | |
| CN115929451A (en) | Differential pressure sensor icing risk identification method, differential pressure sensor icing risk identification device, medium and equipment | |
| CN113803140B (en) | Method for diagnosing credibility of exhaust temperature sensor | |
| CN111305969B (en) | Control method and device for LNG pump in HPDI gas supply system | |
| CN115753146A (en) | Detecting vehicle NO x Method, device and equipment for exceeding discharge capacity and storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |