CN114235271A - Method and device for detecting dew point of differential pressure sensor, storage medium and equipment - Google Patents
Method and device for detecting dew point of differential pressure sensor, storage medium and equipment Download PDFInfo
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- CN114235271A CN114235271A CN202111339401.6A CN202111339401A CN114235271A CN 114235271 A CN114235271 A CN 114235271A CN 202111339401 A CN202111339401 A CN 202111339401A CN 114235271 A CN114235271 A CN 114235271A
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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 an environment temperature and marking the basic delay time as target time under the condition that the water temperature of a first engine is not more than a first preset water temperature threshold value and/or the water temperature of a second engine is not more than a second preset water temperature threshold value. And determining a reference time point according to the temperature of the DPF exhaust gas outlet position, and prolonging the target time by taking the reference time point as the start to obtain the target time point. The pressure differential collected over the first time period is identified as an untrusted pressure differential, and the pressure differential collected over the second time period is identified as an authentic pressure differential. The temperature of the position of the DPF exhaust gas outlet, the ambient temperature, the first engine water temperature and the second engine water temperature are used for determining a target time point, and the pressure difference acquired in which time period is credible is determined based on the target time point, so that misjudgment on the pressure difference credibility can be effectively avoided.
Description
Technical Field
The present disclosure relates to dew point detection, and particularly to a method, an apparatus, a storage medium, and a device for detecting a dew point of a differential pressure sensor.
Background
The differential pressure sensor is mainly used for measuring the differential pressure at two ends of a Diesel Particulate Filter (DPF) carrier, detecting the blocking degree of the DPF in real time and realizing related diagnosis (such as various diagnoses of DPF overload, removal, low efficiency, differential pressure sensor credibility and the like) on the DPF. The accuracy of the diagnosis result is affected by the sensitivity of the differential pressure sensor, generally speaking, when the engine is stopped, water molecules in the exhaust gas output to the DPF by the engine are cooled, condensed water is generated on the surface of the differential pressure sensor, the sensitivity of the differential pressure sensor is reduced by the condensed water, and accordingly large errors are generated in the differential pressure acquired by the differential pressure sensor. Therefore, how to judge whether the differential pressure is reliable becomes a key point of attention.
At present, the judging mode of the pressure difference credibility is usually dew point detection, so-called dew point detection, that is, when no condensed water covering on the outer surface of the pressure difference sensor is detected, the pressure difference collected by the pressure difference sensor is determined to be credible. However, when the differential pressure sensor is in a cold condition, the differential pressure credibility judgment result obtained by using the existing dew point detection method has more misjudgments, that is, the existing dew point detection accuracy is low in the cold condition.
Disclosure of Invention
The application provides a method, a device, a storage medium and equipment for detecting a dew point of a differential pressure sensor, and aims to detect the accuracy of the dew point under a cold working condition.
In order to achieve the above object, the present application provides the following technical solutions:
a method of dew point detection for 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 when the engine is started 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 instant of starting the engine in the current driving cycle;
acquiring basic delay time corresponding to the environment temperature from a first preset data table;
identifying the base delay time as a target time when 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;
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;
the reference time point is used as the starting point, the target time is prolonged, and a target time point is obtained;
identifying a differential pressure collected by the differential pressure sensor within a first time period as an untrusted differential pressure, and identifying a differential pressure collected by the differential pressure sensor within a second time period as a trusted differential pressure; the first time period is as follows: starting from the time point of the whole vehicle power-on of the current driving cycle until the time period of the target time point; the second time period is as follows: and starting from the target time point until the end of the power-off time point of the whole vehicle of the current driving cycle.
Optionally, the monitoring data further includes a label of a previous driving cycle;
after obtaining the basic delay time corresponding to the ambient temperature from the first preset data table, the method further includes:
and under the condition that the value of the label of the last driving cycle is a first numerical value, the first engine water temperature is greater than the first preset water temperature threshold, and the second engine water temperature is greater than the second preset water temperature threshold, correcting the basic delay time based on the first engine water temperature and the second engine water temperature to obtain the target time.
Optionally, the modifying 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 of 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 label of a previous driving cycle;
after obtaining the basic delay time corresponding to the ambient temperature from the first preset data table, the method further includes:
and under the condition that the value of the label of the previous driving cycle is a second value, identifying the basic delay time as the target time.
Optionally, after the reference time point is used as a start, the target time is extended, and a target time point is obtained, the method further includes:
setting a label for the current driving cycle under the condition that the time point of stopping the engine of the current driving cycle is determined to be later than the target time point, and setting the value of the label as a first numerical value; the label is used for indicating the residual condition of condensed water outside the differential pressure sensor when the engine is stopped; and if the value of the label is a first value, the condition that no condensed water is left on the surface of the differential pressure sensor when the engine is stopped is represented.
Optionally, after the reference time point is used as a start, the target time is extended, and a target time point is obtained, the method further includes:
setting a label for the current driving cycle and setting the value of the label as a second numerical value under the condition that 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 outside the differential pressure sensor when the engine is stopped; and if the value of the label is a second value, the label represents that condensed water is remained on the surface of the differential pressure sensor 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 the heat of the surface of a 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;
identifying a time point with the first sequence bit in the time point sequence as a reference time point; the time point sequence is obtained by sequencing all time points meeting preset conditions according to the sequence of time from early to late; the preset conditions are as follows: and the heat on the outer surface of the differential pressure sensor at the time point is greater than a preset threshold value.
A dew point detecting 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 when the engine is started 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 instant 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 determination 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 the second engine water temperature is not greater than a second preset water temperature threshold;
a reference determination 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 prolonging unit is used for prolonging the target time by taking the reference time point as a start to obtain a target time point;
the pressure difference judging unit is used for identifying the pressure difference collected by the pressure difference sensor in a first time period as an unreliable pressure difference and identifying the pressure difference collected by the pressure difference sensor in a second time period as a reliable pressure difference; the first time period is as follows: a time period starting from the time point of the whole vehicle power-on and ending to the target time point; the second time period is as follows: and starting from the target time point until the end of the power-off time point of the whole vehicle of the current driving cycle.
A computer-readable storage medium including a stored program, wherein the program executes the method of dew point detection for a differential pressure sensor.
A dew point detecting apparatus of a differential pressure sensor, comprising: a processor, a memory, and a bus; the processor and the memory are connected through the bus;
the memory is used for storing a program, and the processor is used for running the program, wherein the program is run for executing 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. Identifying the base delay time as the target time if 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. The reference time point is determined according to the temperature of the exhaust gas outlet position of the diesel particulate trap at any time point of the current driving cycle. And (5) with the reference time point as the start, prolonging the target time to obtain the target time point. Identifying a differential pressure collected by the differential pressure sensor over a first time period as an untrusted differential pressure, and identifying a differential pressure collected by the differential pressure sensor over a second time period as a trusted differential pressure. The method comprises the steps of determining a target time point by utilizing the temperature of the position of the DPF waste gas outlet, the ambient temperature, the first engine water temperature and the second engine water temperature, and determining which time period in the current driving cycle the collected pressure difference is credible based on the target time point. Therefore, the accuracy of dew point detection under the cold working condition can be improved by the scheme.
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In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1a is a schematic flowchart of a method for detecting a dew point of a differential pressure sensor according to an embodiment of the present disclosure;
fig. 1b is a schematic flowchart of a method for detecting a dew point of a differential pressure sensor according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart illustrating another method for detecting a dew point 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 disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The applicant found that: the existing dew point detection mode is used under a cold working condition, and the reason that the detection result accuracy is lower is as follows: in the existing dew point detection mode, the heat on the outer surface of the differential pressure sensor is usually utilized to judge whether condensed water remains on the outer surface of the differential pressure sensor, specifically, if the heat is greater than a preset threshold, it is determined that the condensed water has enough heat to realize heat absorption evaporation, therefore, when the heat at a certain time point is monitored to be greater than the preset threshold, the pressure difference collected by the differential pressure sensor after the time point is considered to be credible, the pressure difference collected before the time point is incredible, however, under a cold working condition, the condensed water on the outer surface of the differential pressure sensor may be frozen, the heat absorbed by the evaporated frozen condensed water is more than that absorbed in a normal liquid state, therefore, when the heat at a certain time point is monitored to be greater than the preset threshold, the time point of directly considering that the frozen condensed water is completely evaporated is inaccurate, under an actual condition, at this point in time, there is a high possibility that frozen condensate water remains on the exterior of the differential pressure sensor, which further leads to erroneous determination of the differential pressure reliability.
Based on the findings of the applicant, 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 schematic flowchart of a method for detecting a dew point of a differential pressure sensor provided in an embodiment of the present application includes the following steps:
s101: acquiring the temperature of the exhaust gas outlet position of the DPF at any time point of the current driving cycle, the ambient temperature when the engine is started in the current driving cycle, the first engine water temperature, the second engine water temperature and the label of the previous 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 is stopped in the last driving cycle, and the second engine water temperature is the engine water temperature at the moment of starting the engine in 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 may be acquired by a water temperature sensor preset in an engine cooling system, and recorded in an Electronic Control Unit (ECU) of the entire vehicle.
And a label of the driving cycle for indicating a residual condition of the condensed water outside the differential pressure sensor when the engine is stopped. If the value of the label is a first value, the condition that no condensed water is left on the outer surface of the differential pressure sensor when the engine is stopped is represented. And if the value of the label is a second numerical value, the condensate water is remained on the 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 the 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 label of the previous driving cycle defaults to the second value.
S102: and acquiring the basic delay time corresponding to the ambient temperature from the first preset data table.
The environment temperature and the basic delay time are in an inverse relation, namely the lower the environment temperature is, the larger the basic delay time is.
S103: and under the condition that the value of the label of the last driving cycle is a first numerical value, the water temperature of the first engine is greater than a first preset water temperature threshold value, and the water temperature of the second engine is greater than a second preset water temperature threshold value, calculating the difference value between the water temperature of the second engine and the water temperature of the first engine to obtain the water temperature difference.
If the value of the label of the previous driving cycle is a first numerical value, the water temperature of the first engine is greater than a first preset water temperature threshold value, and the water temperature of the second engine is greater than a second preset water temperature threshold value, the condensed water which is frozen on the outer surface of the differential pressure sensor is not much.
S104: and acquiring a correction coefficient corresponding to the water temperature difference from a second preset data table.
The water temperature difference is proportional to the correction coefficient, i.e. the smaller the water temperature difference, the smaller the correction coefficient.
S105: and calculating the product of the basic delay time and the correction coefficient to obtain the target time.
After execution of S105, execution continues with S108.
In general, the product of the basic delay time and the correction coefficient is calculated to obtain the target time, which is substantially to adjust the basic delay time.
S106: and under the condition that the value of the label of the last driving cycle is the second value, marking the basic delay time as the target time.
After execution of S106, execution continues with S108.
If the value of the label of the previous driving cycle is the second numerical value, the fact that more frozen condensed water remains on the outer surface of the differential pressure sensor is represented, therefore, basic delay time does not need to be adjusted, namely, the condensed water on the outer surface of the current differential pressure sensor is determined not to be completely evaporated, and longer time is needed to be delayed to absorb heat to achieve complete evaporation.
S107: identifying the base delay time as the target time if 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.
After execution of S107, execution of S108 is continued.
If the water temperature of the first engine is not greater than the first preset water temperature threshold value and/or the water temperature of the second engine is not greater than the second preset water temperature threshold value, it means that more frozen condensate water remains on the outer surface of the differential pressure sensor, therefore, the basic delay time does not need to be adjusted, namely, the condensate water on the outer surface of the current differential pressure sensor is determined not to be completely evaporated, and a longer time is needed to be delayed to absorb heat 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 surface of the differential pressure sensor at each time point.
The condensed water (solid and liquid) is evaporated into gaseous water, heat needs to be absorbed, the heat absorbed by the condensed water is the heat on the outer surface of the differential pressure sensor, and therefore whether the condensed water is evaporated or not can be judged by determining the heat absorbed by the condensed water.
S109: and identifying the time point with the first sequence bit in the time point sequence as the reference time point.
The time point sequence is obtained by sequencing all time points meeting preset conditions, wherein the preset conditions are as follows: the heat quantity of the external surface of the differential pressure sensor at the time point is larger than a preset threshold value.
For the existing dew point detection method, when the heat quantity is greater than a preset threshold value, it represents that the condensed water on the outer surface of the differential pressure sensor is completely evaporated. However, when the entire vehicle (i.e., the differential pressure sensor) is in a cold condition, it is not accurate enough to determine that the condensed water has completely evaporated because: under cold working conditions, the condensed water will freeze (i.e. solid water), and compared with ordinary liquid water, the heat required for evaporating the solid water into gaseous water is significantly higher, so that the time point when the heat is greater than the preset heat threshold (i.e. the time point when the pressure difference sensor collects the pressure difference) is not the time point when the condensed water is completely evaporated, i.e. the pressure difference sensor may also have frozen condensed water, and the pressure difference collected at the time point is not reliable.
The flow shown in S108-S109 can be summarized as follows: the reference time point is determined according to the temperature of the exhaust gas outlet position of the diesel particulate trap at any time point of the current driving cycle. Generally, the flow shown in S108-S109 is a common method for detecting dew point.
S110: and (5) with the reference time point as the start, prolonging the target time to obtain the target time point.
S111: and judging whether the time point of the current driving cycle engine stop is later than the target time point.
If the time point of the engine stop of the previous driving cycle is later than the target time point, 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 execution of S112, execution of S113 is continued.
If the time point of the stop of the engine in the current driving cycle is later than the target time point, the condensed water on the outer surface of the differential pressure sensor is completely evaporated when the engine in the current driving cycle is stopped, namely, the condensed water does not remain on the outer surface of the differential pressure sensor, and therefore the value of the label in the current driving cycle is set as a first numerical value.
S113: identifying a differential pressure collected by the differential pressure sensor over a first time period as an untrusted differential pressure, and identifying a differential pressure collected by the differential pressure sensor over a second time period as a trusted differential pressure.
Wherein the first time period is: and the time period from the time point of the whole vehicle power-on to the end of the target time point. The second time period is as follows: and the time period from the target time point to the end of the power-off time point of the whole vehicle of the current driving cycle.
Generally, the pressure difference collected by the differential pressure sensor in the first time period is not determined that the condensed water on the exterior of the differential pressure sensor has completely evaporated, so the pressure difference collected in the first time period is marked as an unreliable pressure difference.
Since the second time period is a time period from the target time point to the end of the time point of the power-off of the whole vehicle in the current driving cycle, therefore, it can be definitely considered that the condensed water on the outer surface of the differential pressure sensor is completely evaporated, that is, the condensed water on the outer surface of the differential pressure sensor does not remain, and therefore it is determined that the collected differential pressure in the second time period is credible.
S114: and setting a label for the current driving cycle, and setting the value of the label of the current driving cycle as a second numerical value.
After execution of S114, execution continues with S113.
If the stopping time point of the engine in the current driving cycle is earlier than the target time point, the condensed water on the surface of the differential pressure sensor is determined not to be completely evaporated when the engine in the current driving cycle is stopped, namely the condensed water is remained on the surface of the differential pressure sensor, so that the value of the label in the current driving cycle is set as a second numerical value.
In summary, the temperature of the exhaust gas outlet position of the DPF, the ambient temperature, the first engine water temperature and the second engine water temperature are used for determining the target time point, and the time period within the current driving cycle during which the collected pressure difference is credible is determined based on the target time point. Therefore, the accuracy of dew point detection under the cold working condition can be improved by using the scheme shown in the embodiment.
It should be noted that, in the above embodiment, reference is made to S101, which is an alternative implementation manner of the method for detecting the dew point of the differential pressure sensor shown in the embodiment of the present application. In addition, S112 mentioned in the above embodiments is also an optional implementation manner of the method for detecting the dew point of the differential pressure sensor shown in the embodiments of the present application. For this reason, the flow mentioned in the above embodiment can be summarized as the method described in fig. 2.
As shown in fig. 2, a schematic flow chart of another method for detecting a dew point 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 when the engine is started 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 instant of engine start in the current driving cycle.
S202: and acquiring the basic delay time corresponding to the ambient temperature from the first preset data table.
S203: identifying the base delay time as the target time if 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.
S204: the reference time point is determined according to the temperature of the exhaust gas outlet position of the diesel particulate trap at any time point of the current driving cycle.
S205: and (5) with the reference time point as the start, prolonging the target time to obtain the target time point.
S206: identifying a differential pressure collected by the differential pressure sensor over a first time period as an untrusted differential pressure, and identifying a differential pressure collected by the differential pressure sensor over a second time period as a trusted differential pressure.
Wherein the first time period is: a time period starting from the time point of the whole vehicle power-on and ending to the target time point; the second time period is as follows: and the time period from the target time point to the end of the power-off time point of the whole vehicle of the current driving cycle.
In summary, the temperature of the exhaust gas outlet position of the DPF, the ambient temperature, the first engine water temperature and the second engine water temperature are used for determining the target time point, and the time period within the current driving cycle during which the collected pressure difference is credible is determined based on the target time point. Therefore, the accuracy of dew point detection under the cold working condition can be improved by using the scheme shown in the embodiment.
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, a schematic structural diagram of a dew point detecting device of a differential pressure sensor provided in 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 comprises 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 when the engine is started 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 instant of engine start in the current driving cycle.
In addition, the monitoring data also includes a label of the last driving cycle.
The time obtaining unit 200 is configured to obtain a basic delay time corresponding to the ambient temperature from a first preset data table.
A time determination unit 300, configured to identify the base delay time as the target time if the first engine water temperature is not greater than the first preset water temperature threshold, and/or the second engine water temperature is not greater than the second preset water temperature threshold.
Wherein the time determination unit 300 is further configured to: and under the condition that the value of the label of the last driving cycle is a first numerical 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, 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 is specifically configured to: calculating the difference value of 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 under the condition that the value of the label of the last driving cycle is the second value, marking the basic delay time as the target time.
A reference determination unit 400 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 a current driving cycle.
The reference determining unit 400 is specifically configured to: obtaining the heat on the surface of a 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; identifying a time point with the first sequence bit in the time point sequence as a reference time point; the time point sequence is obtained by sequencing all time points meeting preset conditions according to the sequence of time from early to late; the preset conditions are as follows: the heat quantity of the external 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 by using the reference time point as a start point to obtain a target time point.
A differential pressure discrimination unit 600, configured to identify a differential pressure collected by the differential pressure sensor in a first time period as an untrusted differential pressure, and identify a differential pressure collected by the differential pressure sensor in a second time period as a trusted differential pressure; the first time period is as follows: a time period starting from the time point of the whole vehicle power-on and ending to the target time point; the second time period is as follows: and the time period from the target time point to the end of the power-off time point of the whole vehicle of 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 as a first numerical value when it is determined that a time point at which an engine of the current driving cycle stops is later than a target time point; the label is used for indicating the residual condition of the condensed water on the surface of the differential pressure sensor when the engine is stopped; if the value of the label is a first value, the condition that no condensed water is left on the outer surface of the differential pressure sensor when the engine is stopped is represented.
The label setting unit 700 is further configured to: setting a label for the current driving cycle under the condition that the time point of stopping the engine of the current driving cycle is determined to be earlier than the target time point, and setting the value of the label as a second numerical value; the label is used for indicating the residual condition of the condensed water on the surface of the differential pressure sensor when the engine is stopped; and if the value of the label is a second numerical value, the condensate water is remained on the surface of the differential pressure sensor when the engine is stopped.
In summary, the temperature of the exhaust gas outlet position of the DPF, the ambient temperature, the first engine water temperature and the second engine water temperature are used for determining the target time point, and the time period within the current driving cycle during which the collected pressure difference is credible is determined based on the target time point. Therefore, the accuracy of dew point detection under the cold working condition can be improved by using the scheme shown in the embodiment.
The present application also provides a computer-readable storage medium including a stored program, wherein the program performs the above-mentioned method of detecting a dew point of a differential pressure sensor provided by the present application.
The present application further provides a differential pressure sensor's dew point detection device, including: a processor, a memory, and a bus. The processor is connected with the memory through a bus, the memory is used for storing programs, and the processor is used for running the programs, wherein when the programs are run, the dew point detection method of the differential pressure sensor provided by the application is executed, and the dew point detection method 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 when the engine is started 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 instant of starting the engine in the current driving cycle;
acquiring basic delay time corresponding to the environment temperature from a first preset data table;
identifying the base delay time as a target time when 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;
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;
the reference time point is used as the starting point, the target time is prolonged, and a target time point is obtained;
identifying a differential pressure collected by the differential pressure sensor within a first time period as an untrusted differential pressure, and identifying a differential pressure collected by the differential pressure sensor within a second time period as a trusted differential pressure; the first time period is as follows: starting from the time point of the whole vehicle power-on of the current driving cycle until the time period of the target time point; the second time period is as follows: and starting from the target time point until the end of the power-off time point of the whole vehicle of the current driving cycle.
Specifically, on the basis of the above embodiment, the monitoring data further includes a label of a previous driving cycle;
after obtaining the basic delay time corresponding to the ambient temperature from the first preset data table, the method further includes:
and under the condition that the value of the label of the last driving cycle is a first numerical value, the first engine water temperature is greater than the first preset water temperature threshold, and the second engine water temperature is greater than the second preset water temperature threshold, correcting the basic delay time based on the first engine water temperature and the second engine water temperature to obtain the target time.
Specifically, in addition to the above embodiment, the correcting the base 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 of 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 label of a previous driving cycle;
after obtaining the basic delay time corresponding to the ambient temperature from the first preset data table, the method further includes:
and under the condition that the value of the label of the previous driving cycle is a second value, identifying the basic delay time as the target time.
Specifically, on the basis of the above embodiment, after the target time is obtained by extending the target time starting from the reference time, the method further includes:
setting a label for the current driving cycle under the condition that the time point of stopping the engine of the current driving cycle is determined to be later than the target time point, and setting the value of the label as a first numerical value; the label is used for indicating the residual condition of condensed water outside the differential pressure sensor when the engine is stopped; and if the value of the label is a first value, the condition that no condensed water is left on the surface of the differential pressure sensor when the engine is stopped is represented.
Specifically, on the basis of the above embodiment, after the target time is obtained by extending the target time starting from the reference time, the method further includes:
setting a label for the current driving cycle and setting the value of the label as a second numerical value under the condition that 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 outside the differential pressure sensor when the engine is stopped; and if the value of the label is a second value, the label represents that condensed water is remained on the surface of the differential pressure sensor when the engine is stopped.
Specifically, on the basis of the above embodiment, 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 the heat of the surface of a 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;
identifying a time point with the first sequence bit in the time point sequence as a reference time point; the time point sequence is obtained by sequencing all time points meeting preset conditions according to the sequence of time from early to late; the preset conditions are as follows: and the heat on the outer surface of the differential pressure sensor at the time point is greater than a preset threshold value.
The functions described in the method of the embodiment of the present application, if implemented in the form of software functional units and sold or used as independent products, may be stored in a storage medium readable by a computing device. Based on such understanding, part of the contribution to the prior art of the embodiments of the present application or part of the technical solution may be embodied in the form of a software product stored in a storage medium and including several instructions for causing a computing device (which may be a personal computer, a server, a mobile computing device or a network device) to execute all or part of the steps of the method 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), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among 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 method of detecting a dew point 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 when the engine is started 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 instant of starting the engine in the current driving cycle;
acquiring basic delay time corresponding to the environment temperature from a first preset data table;
identifying the base delay time as a target time when 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;
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;
the reference time point is used as the starting point, the target time is prolonged, and a target time point is obtained;
identifying a differential pressure collected by the differential pressure sensor within a first time period as an untrusted differential pressure, and identifying a differential pressure collected by the differential pressure sensor within a second time period as a trusted differential pressure; the first time period is as follows: starting from the time point of the whole vehicle power-on of the current driving cycle until the time period of the target time point; the second time period is as follows: and starting from the target time point until the end of the power-off time point of the whole vehicle of the current driving cycle.
2. The method of claim 1, wherein the monitoring data further comprises a label of a previous driving cycle;
after obtaining the basic delay time corresponding to the ambient temperature from the first preset data table, the method further includes:
and under the condition that the value of the label of the last driving cycle is a first numerical value, the first engine water temperature is greater than the first preset water temperature threshold, and the second engine water temperature is greater than the second preset water temperature threshold, correcting the basic delay time based on the first engine water temperature and the second engine water temperature to obtain the target time.
3. The method of claim 2, wherein said modifying 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 of 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 label of a previous driving cycle;
after obtaining the basic delay time corresponding to the ambient temperature from the first preset data table, the method further includes:
and under the condition that the value of the label of the previous driving cycle is a second value, identifying the basic delay time as the target time.
5. The method according to claim 1, wherein after the target time is obtained by extending the target time starting from the reference time, further comprising:
setting a label for the current driving cycle under the condition that the time point of stopping the engine of the current driving cycle is determined to be later than the target time point, and setting the value of the label as a first numerical value; the label is used for indicating the residual condition of condensed water outside the differential pressure sensor when the engine is stopped; and if the value of the label is a first value, the condition that no condensed water is left on the surface of the differential pressure sensor when the engine is stopped is represented.
6. The method according to claim 1, wherein after the target time is obtained by extending the target time starting from the reference time, further comprising:
setting a label for the current driving cycle and setting the value of the label as a second numerical value under the condition that 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 outside the differential pressure sensor when the engine is stopped; and if the value of the label is a second value, the label represents that condensed water is remained on the surface of the differential pressure sensor when the engine is stopped.
7. The method of claim 1, wherein determining a reference time point based on the temperature of the exhaust gas outlet location of the diesel particulate trap at any time point of the current driving cycle comprises:
obtaining the heat of the surface of a 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;
identifying a time point with the first sequence bit in the time point sequence as a reference time point; the time point sequence is obtained by sequencing all time points meeting preset conditions according to the sequence of time from early to late; the preset conditions are as follows: and the heat on the outer surface of the differential pressure sensor at the time point is greater than a preset threshold value.
8. A dew point detecting 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 when the engine is started 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 instant 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 determination 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 the second engine water temperature is not greater than a second preset water temperature threshold;
a reference determination 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 prolonging unit is used for prolonging the target time by taking the reference time point as a start to obtain a target time point;
the pressure difference judging unit is used for identifying the pressure difference collected by the pressure difference sensor in a first time period as an unreliable pressure difference and identifying the pressure difference collected by the pressure difference sensor in a second time period as a reliable pressure difference; the first time period is as follows: a time period starting from the time point of the whole vehicle power-on and ending to the target time point; the second time period is as follows: and starting from the target time point until the end of the power-off time point of the whole vehicle of the current driving cycle.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium includes a stored program, wherein the program executes the method for dew point detection of a differential pressure sensor according to any one of claims 1 to 7.
10. A dew point detecting apparatus of a differential pressure sensor, comprising: a processor, a memory, and a bus; the processor and the memory are connected through the bus;
the memory is used for storing a program, and the processor is used for running the program, wherein the program is used for executing the dew point detection method of the differential pressure sensor in any one of claims 1 to 7.
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