CN114441095B - Detection method and device of sensor - Google Patents
Detection method and device of sensor Download PDFInfo
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- CN114441095B CN114441095B CN202210371166.9A CN202210371166A CN114441095B CN 114441095 B CN114441095 B CN 114441095B CN 202210371166 A CN202210371166 A CN 202210371166A CN 114441095 B CN114441095 B CN 114441095B
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Abstract
The embodiment of the application discloses a detection method and a detection device of a sensor, when a vehicle is in a parking state, acquiring a downstream pressure actual value of a vehicle particle trap and a pressure difference actual value of upstream pressure and downstream pressure of the particle trap under the state, determining a downstream pressure measurement value according to the acquired downstream pressure actual value, determining a pressure difference measurement value according to the acquired pressure difference actual value, and acquiring a downstream pressure reference value and a pressure difference reference value which are calibrated in advance; and further detecting whether the differential pressure sensor of the particle trap has acquisition deviation according to the relationship between the downstream pressure measurement value and the downstream pressure reference value and the relationship between the differential pressure measurement value and the differential pressure reference value. The detection of whether a detection offset occurs for a differential pressure sensor of the particle trap is carried out on the basis of the downstream pressure and the differential pressure of the particle trap in the parked state of the vehicle.
Description
Technical Field
The present disclosure relates to the field of vehicle control technologies, and in particular, to a method and an apparatus for detecting a sensor.
Background
With the implementation of the national standards of the method for limiting and measuring pollutant emissions of heavy-duty Diesel vehicles (sixth stage of china), Particulate traps (DPF) become vehicle exhaust gas post-treatment devices commonly used by various manufacturers.
The DPF can trap particulate matter (e.g., soot particles) in exhaust gas emitted from the engine, thereby purifying the exhaust gas, and when the particulate matter trapped by the DPF is accumulated to a certain extent, the DPF is regenerated to burn off the trapped particulate matter. The premise for reasonably carrying out DPF regeneration is to accurately obtain the particulate matter trapping amount in the DPF, and if the actual value of the particulate matter trapping amount is too different from a calculated value of an Electronic Control Unit (ECU) of a vehicle, the DPF can be directly burnt out. In the related technology, the differential pressure sensor is mainly used for collecting the differential pressure values of the upstream and downstream sides of the DPF in the driving process and taking the differential pressure values as the index of the particulate matter trapping amount calculated by the ECU. Therefore, the accuracy of the pressure difference value acquired by the pressure difference sensor is very critical, and when the acquired pressure difference value deviates, namely the pressure difference sensor is considered to have acquisition deviation, the calculation of the particulate matter trapping amount in the DPF is inaccurate, diagnosis and false alarm occur, so that frequent regeneration or untimely regeneration of the DPF is caused, and the driving safety is directly influenced in severe cases.
Therefore, it is significant to detect whether the acquisition deviation occurs in the pressure difference sensor of the DPF.
Disclosure of Invention
In order to solve the technical problem, the application provides a detection method and a detection device of a sensor, which are used for detecting whether the acquisition offset occurs to a pressure difference sensor of a DPF.
The embodiment of the application discloses the following technical scheme:
in one aspect, an embodiment of the present application provides a detection method for a sensor, where the method includes:
when a vehicle is in a parking state, acquiring a downstream pressure actual value and a pressure difference actual value of a particle trap of the vehicle; the pressure differential is used to identify a difference in upstream and downstream pressures of the particulate trap;
determining a downstream pressure measurement value according to the downstream pressure actual value, and determining a differential pressure measurement value according to the differential pressure actual value;
acquiring a pre-calibrated downstream pressure reference value and a pressure difference reference value;
and detecting whether the acquisition deviation exists in a differential pressure sensor of the particle trap according to the relationship between the downstream pressure measurement value and the downstream pressure reference value and the relationship between the differential pressure measurement value and the differential pressure reference value.
On the other hand, the embodiment of the application provides a detection device of a sensor, the device includes an acquisition unit, a determination unit, an acquisition unit and a detection unit:
the collecting unit is used for collecting a downstream pressure actual value and a pressure difference actual value of a particle trap of the vehicle when the vehicle is in a parking state; the pressure differential is used to identify a difference in upstream and downstream pressures of the particulate trap;
the determining unit is used for determining a downstream pressure measurement value according to the downstream pressure actual value and determining a differential pressure measurement value according to the differential pressure actual value;
the acquisition unit is used for acquiring a pre-calibrated downstream pressure reference value and a pressure difference reference value;
the detection unit is used for detecting whether the differential pressure sensor of the particle trap has acquisition offset or not according to the relationship between the downstream pressure measurement value and the downstream pressure reference value and the relationship between the differential pressure measurement value and the differential pressure reference value.
According to the technical scheme, when the vehicle is in a parking state, the downstream pressure actual value of the vehicle particle trap and the pressure difference actual value of the upstream pressure and the downstream pressure of the particle trap under the state are collected, the downstream pressure measurement value is determined according to the collected downstream pressure actual value, the pressure difference measurement value is determined according to the collected pressure difference actual value, and the downstream pressure reference value and the pressure difference reference value which are calibrated in advance are obtained; and further detecting whether the differential pressure sensor of the particle trap has acquisition deviation according to the relationship between the downstream pressure measurement value and the downstream pressure reference value and the relationship between the differential pressure measurement value and the differential pressure reference value. The embodiment of the application innovatively provides a detection mechanism for a differential pressure sensor of a particle trap, and a downstream pressure actual value of the particle trap is introduced into the detection mechanism to assist in detecting whether a collecting offset exists in a differential pressure actually measured by the differential pressure sensor. Specifically, in the detection mechanism, whether the differential pressure sensor has the acquisition offset is detected based on a relationship between a downstream pressure measurement value (determined from a downstream pressure actual value) and a downstream pressure reference value, and a relationship between a differential pressure measurement value (determined from a differential pressure actual value) and a differential pressure reference value; on the basis that the relation between the downstream pressure measurement value and the downstream pressure reference value can reflect whether the detected downstream pressure is normal or not, the relation between the differential pressure measurement value and the differential pressure reference value can reflect whether the detected differential pressure is normal or not, and whether the actual measurement values of the two parameters are normal or not has a close correlation relationship, the accuracy of the detection result can be effectively ensured through the detection mechanism provided by the embodiment of the application.
Drawings
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. 1 is a schematic diagram of an intake and exhaust system of a diesel engine according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a method of detecting a sensor according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a detection logic of a sensor according to an embodiment of the present disclosure;
fig. 4 is a device structure diagram of a detection device of a sensor according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, 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.
Fig. 1 is a schematic diagram of an intake and exhaust system of a diesel engine according to an embodiment of the present disclosure, specifically, (a) in fig. 1 is a schematic diagram of a system layout, (b) in fig. 1 is a schematic diagram of an overall structure of a DPF, and (c) in fig. 1 is a schematic diagram of an internal structure of the DPF.
As shown in fig. 1 (a), 101 denotes an engine, 102 denotes a DOC (Oxidation Catalyst), 103 denotes a DPF, and 104 denotes a differential pressure sensor.
DOCs, typically comprising precious metal catalysts (e.g., precious metal platinum (Pt)) coated on a honeycomb ceramic support, are designed to reduce the activation energy of chemical reactions of HC (hydrocarbons), CO (carbon monoxide) and SOF (soluble organic components) in engine exhaust, so that these substances can undergo oxidation reaction with oxygen in the exhaust at a relatively low temperature and finally be converted into CO 2 And H 2 And O. DOC does not need a regeneration system and a control device, has the characteristics of simple structure and good reliability, and is widely applied to tail gas aftertreatment systems of diesel engines and the like.
DPF filters and traps particulate matter in engine exhaust mainly by diffusion, deposition and impaction mechanisms, wherein the particulate matter in engine exhaust mainly contains two substances of unburned Soot (Soot) and ash (ash). When engine exhaust flows through the DPF, particulate matter in the exhaust is trapped in a filter element of the DPF filter, and cleaner exhaust is discharged into the atmosphere. At present, the DPF is mainly applied to engineering machinery, urban buses and the like, is mainly applied to wall-flow honeycomb ceramic filters and has the characteristics of simplicity in operation, high filtering efficiency and the like, but the problems of DPF regeneration and sensitivity to sulfur components in engine fuel exist.
As shown in fig. 1 (b), is an overall structure of the DPF, including an oxidation catalyst coating layer and a filter substrate; as shown in fig. 1 (c), the filter substrate is designed to filter and trap particulate matter in engine exhaust, which is an internal structure of the DPF.
The working principle of the DPF is that when engine exhaust flows through DOC, CO and HC are almost completely oxidized into CO at the temperature of 200-600 DEG C 2 And H 2 O, with conversion of NO to NO 2 (ii) a The exhaust is then discharged from the DOC into the DPF, where the particulate matter is trapped in the filter element of the filter, discharging the cleaner exhaust into the atmosphere. Generally, the DPF trapping efficiency can reach 90% or more.
As the operating time increases, more and more particulate matters are deposited in the DPF, which not only affects the filtering effect of the DPF, but also increases the exhaust back pressure of the engine, thereby affecting the air exchange and combustion performance of the engine, resulting in a decrease in power output and an increase in oil consumption of the engine, and therefore, the deposited particulate matters need to be removed periodically to recover the filtering performance of the DPF. The process of removing particulate matter deposited in the DPF is called DPF regeneration, which mainly includes two methods, active regeneration and passive regeneration.
Active regeneration refers to raising the temperature in the DPF by using external energy, so that deposited particulate matters are ignited and burned. When a differential pressure sensor of the DPF detects that the pressure difference between the upstream and the downstream of the DPF is too large, the accumulated amount of carbon which can be carried by the DPF is considered to be reached, and at the moment, the temperature in the DPF is increased through external energy (for example, diesel oil is injected and combusted before DOC), so that the temperature in the DPF reaches a certain temperature, deposited particulate matters are ignited and combusted, and the aim of regeneration is fulfilled. Generally, the temperature in a DPF rises above 550 ℃ to completely combust the deposited particulates, thereby restoring the filtering capabilities of the DPF.
Passive regeneration refers to the utilization of NO with strong oxidizing power in the exhaust gas of the engine within a certain temperature range 2 As an oxidant, the deposited particles are oxidized to CO 2 While NO 2 Is reduced to generate NO, thereby achieving the purpose of removing deposited particulate matters. The passive regeneration is carried out without injecting extra fuel, so that the more times the passive regeneration is carried out in the life cycle of the DPF, the longer the period for carrying out the active regeneration is, the less fuel is consumed by an engine tail gas aftertreatment system, and the overall fuel consumption of the engine is reduced to a certain extent.
It should be noted that the engine shown in fig. 1 is a six-cylinder diesel engine, and the engine Exhaust Gas after-treatment system may include not only the DOC and the DPF shown in fig. 1, but also treatment systems such as SCR (Selective Catalytic Reduction), EGR (Exhaust Gas Recirculation), and the like. That is, fig. 1 is a schematic diagram illustrating the structure of an intake and exhaust system of a diesel engine, which is only an example, and should not be construed as limiting the present application.
Fig. 2 is a flowchart of a method of detecting a sensor according to an embodiment of the present application, where the method includes:
s201: the method comprises the steps of collecting an actual value of pressure and an actual value of pressure difference downstream of a particle trap of a vehicle when the vehicle is in a parking state.
Wherein the pressure differential is used to identify a difference between an upstream pressure and a downstream pressure of the particulate trap. During the running of the vehicle, when the vehicle enters a parking state, the downstream pressure actual value and the pressure difference actual value of the particle catcher of the vehicle are collected.
It should be noted that, since the downstream pressure reference value and the differential pressure reference value of the vehicle in the parking state can be accurately calibrated, the vehicle operating state condition that the vehicle is in the parking state is selected as the data acquisition in the present application, and the detection of whether the differential pressure sensor of the DPF has the acquisition offset is realized based on the downstream pressure actual value and the differential pressure actual value acquired when the vehicle is in the parking state.
The parking state of the vehicle may be idle running or zero-speed parking, and it is understood that an Electronic Control Unit (ECU) of the vehicle is in a power-on state when the vehicle is in the parking state.
In one possible implementation, the downstream pressure actual value may be collected by a pressure sensor disposed on an exhaust manifold of the DPF, and the differential pressure actual value may be collected by a differential pressure sensor disposed between an intake manifold and an exhaust manifold of the DPF.
The data collected by the sensor are the downstream pressure signal and the differential pressure signal corresponding thereto, and therefore, in one possible implementation, the downstream pressure signal and the differential pressure signal collected by the sensor are converted into the corresponding downstream pressure actual value and differential pressure actual value by the a/D converter.
In consideration of the difference in signal acquisition consistency between different sensors, in one possible implementation, the differential pressure sensor is an intelligent sensor;
then, the downstream pressure actual value and the differential pressure actual value are collected using the smart sensor.
Therefore, the condition that the downstream pressure measurement value and the differential pressure measurement value have acquisition differences due to the fact that different sensors are used for acquiring the downstream pressure actual value and the differential pressure actual value is avoided.
In order to quickly determine the downstream pressure and differential pressure measured values in order to detect whether there is an acquisition deviation for the differential pressure sensor of the particle trap, in one possible implementation a single data acquisition mode can be selected, i.e. only one data acquisition is performed to obtain the downstream pressure actual value and the differential pressure actual value when the vehicle is in a parked state.
In order to enable the downstream pressure measurement value and the differential pressure actual value to more accurately reflect the actual conditions of the downstream pressure and the differential pressure of the particulate trap, in a possible implementation mode, a data acquisition mode can be selected for a plurality of times, and then the acquisition of the downstream pressure actual value and the differential pressure actual value of the particulate trap of the vehicle comprises the following steps:
and continuously acquiring a preset number of downstream pressure actual values and a preset number of pressure difference actual values of the particle catcher.
When the vehicle is in a stopped state, in one possible implementation, the continuous acquisition may be performed by acquiring a preset number of downstream pressure actual values and a preset number of differential pressure actual values at a time. Specifically, the preset amount of data is collected within a certain collection time period, for example, the data collection may be completed at equal intervals within a certain collection time period.
When the vehicle is in the parking state, the time from the time when the vehicle enters the parking state to the time when the vehicle ends the parking state is identified as the parking duration.
S202: and determining a downstream pressure measurement value according to the downstream pressure actual value, and determining a differential pressure measurement value according to the differential pressure actual value.
If S201 selects a single data acquisition mode, directly determining the downstream pressure actual value acquired in a single time as the downstream pressure measurement value, and determining the acquired differential pressure actual value as the differential pressure measurement value.
If a data acquisition mode for multiple times is selected in S201, specifically, a preset number of downstream pressure actual values and a preset number of differential pressure actual values of the particle trap are continuously acquired, determining a downstream pressure measurement value according to the downstream pressure actual values, and determining a differential pressure measurement value according to the differential pressure actual values, includes:
and determining the average value of the downstream pressure actual values of the preset number as the downstream pressure measured value, and determining the average value of the differential pressure actual values of the preset number as the differential pressure measured value.
That is, when the vehicle is in a stopped state, the preset number of downstream pressure actual values and pressure difference actual values are continuously collected, so that the contingency of single data collection is avoided, and compared with a mode of directly determining the downstream pressure actual values and the pressure difference actual values which are collected at a single time as the downstream pressure measured values and the pressure difference measured values respectively, the downstream pressure measured values and the pressure difference measured values which are determined based on multiple times of collection and averaging can more accurately reflect the actual conditions of the downstream pressure and the pressure difference of the particle trap.
It should be noted that, in addition to the above-mentioned manner of determining the downstream pressure measurement value and the differential pressure measurement value by averaging the preset number of downstream pressure actual values and differential pressure actual values, other manners may be adopted to determine the downstream pressure measurement value and the differential pressure measurement value according to actual requirements. For example, the preset amount of data is sorted, and after the minimum value and the maximum value are removed, the corresponding downstream pressure measurement value and the pressure difference measurement value are determined, which is not limited in this application.
S203: and acquiring a pre-calibrated downstream pressure reference value and a pressure difference reference value.
Wherein the downstream pressure reference value is used as a reference for whether the downstream pressure of the particle trap is within a reasonable range; the pressure difference reference value is used as a reference for judging whether the pressure difference of the particle catcher is in a reasonable range. The downstream pressure reference and the differential pressure reference may be pre-calibrated and stored in a data storage module of the vehicle.
Along with the increase of the running time of the vehicle, the acquisition precision and the like of a differential pressure sensor of the particle trap can be damaged to a certain extent, and the differential pressure sensor can be influenced by the state of an exhaust pipeline of the engine (such as pipeline air leakage, pipeline icing and the like), which can cause the acquisition offset of the differential pressure sensor. Thus, in one possible implementation, the first time the particulate trap is used in the vehicle as a calibration opportunity for the downstream pressure reference and the pressure difference reference is selected, in particular:
when the particle catcher is used in the vehicle for the first time, calibrating the downstream pressure reference value according to the downstream pressure actual value acquired when the vehicle is in the parking state;
when the particle catcher is used in the vehicle for the first time, the pressure difference reference value is calibrated according to the pressure difference actual value acquired when the vehicle is in the parking state.
In one possible embodiment, when the particle trap is first used in the vehicle, if the vehicle is in a standstill, the current downstream pressure actual value and the differential pressure actual value are recorded, and a downstream pressure reference value and a differential pressure reference value are further determined. For example, a certain number of downstream pressure actual values and pressure difference actual values are continuously collected in this state, the average value of the certain number of downstream pressure actual values is calibrated as a downstream pressure reference value, and the average value of the certain number of pressure difference actual values is calibrated as a pressure difference reference value.
It should be noted that other calibration methods for calibrating the downstream pressure reference value and the differential pressure reference value may also be adopted, and the present application is not limited thereto.
As the particulate matter deposited in the particulate trap reaches a certain level or is used for a certain length of time, the user may choose to perform a cleaning check of the associated components at the vehicle service station. Therefore, it is also possible to select the calibration timing as the downstream pressure reference value and the differential pressure reference value when the vehicle is in the stopped state for the first time after the purge check.
It will be appreciated that if the timing of calibration of the downstream pressure reference value and the differential pressure reference value is selected after the cleaning check when the vehicle is first parked, the newly calibrated downstream pressure reference value and differential pressure reference value may be saved in the data storage module of the vehicle and overwritten with the last calibrated values.
S204: and detecting whether the differential pressure sensor of the particle trap has acquisition deviation according to the relationship between the downstream pressure measurement value and the downstream pressure reference value and the relationship between the differential pressure measurement value and the differential pressure reference value.
Detecting whether a differential pressure sensor of the particle trap has an acquisition offset based on a relationship between the downstream pressure measurement value and the downstream pressure reference value and a relationship between the differential pressure measurement value and the differential pressure reference value. Specifically, when the relationship between the downstream pressure measurement value and the downstream pressure reference value and the relationship between the differential pressure measurement value and the differential pressure reference value satisfy a preset relationship, detecting that the differential pressure sensor has acquisition offset; otherwise, detecting that the differential pressure sensor has no acquisition offset. The acquisition offset is used for identifying that the differential pressure signals acquired by the differential pressure sensor have deviation.
In one possible implementation, the relationship between the downstream pressure measurement value and the downstream pressure reference value and the relationship between the differential pressure measurement value and the differential pressure reference value satisfy a preset relationship, including:
and if the difference value between the downstream pressure measurement value and the downstream pressure reference value is smaller than a preset threshold value, and the absolute value of the differential pressure measurement value is larger than the differential pressure reference value, detecting that a differential pressure sensor of the particle trap has acquisition deviation.
In one possible implementation, the relationship between the downstream pressure measurement value and the downstream pressure reference value and the relationship between the differential pressure measurement value and the differential pressure reference value satisfy a preset relationship, including:
if the downstream pressure measurement value is in a preset interval and the absolute value of the pressure difference measurement value is greater than the pressure difference reference value, detecting that a pressure difference sensor of the particle trap has acquisition deviation;
the lower limit of the preset interval is a lower limit of the downstream pressure, and the upper limit of the preset interval is the reference value of the downstream pressure.
In one possible implementation, the lower downstream pressure limit may be calibrated by: and calibrating the lower limit value of the downstream pressure of the particle catcher based on a gas leakage experiment of the exhaust emission of the vehicle engine.
In one possible implementation, the lower downstream pressure limit may be calibrated by: based on the current vehicle driving condition ratio and data such as the engine model, the particle trap model and the differential pressure sensor model, engineers set the lower limit value of the downstream pressure of the particle trap according to experience.
In order to be able to solve the problem of acquisition offset of the differential pressure sensor in time, in one possible implementation, after detecting that there is an acquisition offset of the differential pressure sensor of the particle trap, the method further includes:
and reporting the offset fault information of the differential pressure sensor.
Therefore, the problem of collection offset of the differential pressure sensor can be timely solved for a user, and the problem that the carbon loading capacity of the DPF is inaccurate due to collection offset of the differential pressure sensor in the driving process is solved.
Since the parking state of the vehicle may be idle running of the vehicle, considering a running condition of the vehicle (for example, a running condition of a frequent red light), the vehicle may frequently enter the parking state, and in order to save resources, in one possible implementation manner, when the number of times that the vehicle is in the parking state is greater than a preset number of times, the number of times may be selected as a detection timing for whether the differential pressure sensor has the acquisition offset, specifically, the S204 includes:
when the number of times that the vehicle is in the parking state is larger than the preset number of times, detecting whether a differential pressure sensor of the particle trap has acquisition offset or not according to the relationship between a downstream pressure target measurement value and the downstream pressure reference value and the relationship between a differential pressure target measurement value and the differential pressure reference value;
wherein the downstream pressure target measurement value is determined from downstream pressure actual values acquired each time the vehicle is in the stopped state, and the differential pressure target measurement value is determined from differential pressure actual values acquired each time the vehicle is in the stopped state.
When the number of times that the vehicle is in the parking state is greater than the preset number of times, detecting whether the differential pressure sensor has the acquisition offset, specifically, detecting whether the differential pressure sensor has the acquisition offset based on the relationship between the downstream pressure target measurement value and the downstream pressure reference value and the relationship between the differential pressure target measurement value and the differential pressure reference value. Detecting that the differential pressure sensor has acquisition offset when the relationship between the downstream pressure target measurement value and the downstream pressure reference value and the relationship between the differential pressure target measurement value and the differential pressure reference value meet a preset relationship; otherwise, detecting that the differential pressure sensor has no acquisition offset. The acquisition offset is used for identifying that the differential pressure signals acquired by the differential pressure sensor have deviation.
In one possible implementation, the relationship between the downstream pressure target measurement value and the downstream pressure reference value and the relationship between the differential pressure target measurement value and the differential pressure reference value satisfy a preset relationship, including:
and if the difference value between the downstream pressure target measurement value and the downstream pressure reference value is smaller than a preset threshold value, and the absolute value of the differential pressure target measurement value is larger than the differential pressure reference value, detecting that the differential pressure sensor of the particle trap has acquisition deviation.
In one possible implementation, the relationship between the downstream pressure target measurement value and the downstream pressure reference value and the relationship between the differential pressure target measurement value and the differential pressure reference value satisfy a preset relationship, including:
if the downstream pressure target measurement value is in a preset interval and the absolute value of the pressure difference target measurement value is greater than the pressure difference reference value, detecting that a pressure difference sensor of the particle trap has acquisition deviation;
the lower limit of the preset interval is a lower limit of the downstream pressure, and the upper limit of the preset interval is the reference value of the downstream pressure.
In one possible implementation, the lower downstream pressure limit may be calibrated by: and calibrating the lower limit value of the downstream pressure of the particle catcher based on a gas leakage experiment of the exhaust emission of the vehicle engine.
In one possible implementation, the lower downstream pressure limit may be calibrated by: based on the current vehicle driving condition ratio and data such as the engine model, the particle trap model and the differential pressure sensor model, engineers set the lower limit value of the downstream pressure of the particle trap according to experience.
When the number of times that the vehicle is in a parking state is greater than a preset number of times, detecting whether a differential pressure sensor has a collecting offset, firstly determining a downstream pressure target measurement value and a differential pressure target measurement value, wherein in one possible implementation manner, the downstream pressure target measurement value is determined by the following manner:
determining an average value of downstream pressure actual values acquired each time the vehicle is in the parking state as the downstream pressure target measurement value;
the target differential pressure measurement is determined by:
and determining the average value of the pressure difference actual values acquired when the vehicle is in the parking state every time as the pressure difference target measurement value.
As the number of times the vehicle is parked varies, the usage of the relevant components varies, and therefore, in one possible implementation, the method further comprises:
for each parking state, configuring corresponding weights for the downstream pressure actual value and the differential pressure actual value acquired in the parking state according to the occurrence time of the parking state;
then, the downstream pressure target measurement is determined by:
determining the downstream pressure target measurement value according to the downstream pressure actual value and the corresponding weight thereof collected in each parking state;
the target differential pressure measurement is determined by:
and determining the pressure difference target measurement value according to the pressure difference actual value acquired in each parking state and the corresponding weight of the pressure difference actual value.
For the current vehicle, if the preset number of times is 3, configuring corresponding weights according to the sequence of occurrence of each parking state, for example, configuring the weight for the first parking state to be 20%, configuring the weight for the second parking state to be 30%, configuring the weight for the third parking state to be 50%, and determining a downstream pressure target measurement value and a differential pressure target measurement value according to the downstream pressure actual value and the differential pressure actual value acquired in each state and the corresponding weights thereof.
Generally, when differential pressure sensor offset fault information is reported, cleaning and checking of relevant components are performed at a vehicle service station. It can be understood that the service performance is better within a certain service time after the cleaning check, so in a possible implementation manner, the running period or the mileage of the vehicle can be set as the detection time for whether the differential pressure sensor has the collecting offset, for example, when the vehicle runs for 3 days or 1000km cumulatively, the detection for whether the differential pressure sensor has the collecting offset is performed once.
Therefore, when the vehicle is in a parking state, acquiring a downstream pressure actual value of the vehicle particle trap in the state and a pressure difference actual value of upstream pressure and downstream pressure of the particle trap, determining a downstream pressure measurement value according to the acquired downstream pressure actual value, determining a pressure difference measurement value according to the acquired pressure difference actual value, and acquiring a downstream pressure reference value and a pressure difference reference value which are calibrated in advance; and further detecting whether the differential pressure sensor of the particle trap has acquisition deviation according to the relationship between the downstream pressure measurement value and the downstream pressure reference value and the relationship between the differential pressure measurement value and the differential pressure reference value. The embodiment of the application innovatively provides a detection mechanism for a differential pressure sensor of a particle trap, and a downstream pressure actual value of the particle trap is introduced into the detection mechanism to assist in detecting whether a collecting offset exists in a differential pressure actually measured by the differential pressure sensor. Specifically, in the detection mechanism, whether the differential pressure sensor has the acquisition offset is detected based on a relationship between a downstream pressure measurement value (determined from a downstream pressure actual value) and a downstream pressure reference value, and a relationship between a differential pressure measurement value (determined from a differential pressure actual value) and a differential pressure reference value; on the basis that the relation between the downstream pressure measurement value and the downstream pressure reference value can reflect whether the detected downstream pressure is normal or not, the relation between the differential pressure measurement value and the differential pressure reference value can reflect whether the detected differential pressure is normal or not, and whether the actual measurement values of the two parameters are normal or not has a close correlation relationship, the accuracy of the detection result can be effectively ensured through the detection mechanism provided by the embodiment of the application.
Fig. 3 is a schematic diagram of detection logic of a sensor according to an embodiment of the present disclosure, in which when it is determined that a vehicle is stopped, average values of downstream pressure actual values and differential pressure actual values of a vehicle particulate trap collected continuously for multiple times are respectively obtained as a downstream pressure measurement value and a differential pressure measurement value; further, when the downstream pressure measurement value is judged to be smaller than the downstream pressure reference value and larger than the downstream pressure lower limit value, and the absolute value of the differential pressure measurement value is larger than the differential pressure reference value, detecting that the differential pressure sensor of the particle trap has acquisition deviation, and reporting corresponding fault information; otherwise, there is no acquisition offset in detecting the differential pressure sensor of the particle trap, i.e., the differential pressure sensor of the particle trap acquires normally.
It can be understood that, in order to facilitate a user to master the acquisition dynamics of the differential pressure sensor, when it is detected that the differential pressure sensor of the particle trap has no acquisition offset, the prompt message that the differential pressure sensor of the particle trap acquires the normal information can be reported.
It should be noted that, since it basically corresponds to the method embodiment, the relevant part can be referred to the part of the description of the method embodiment.
Fig. 4 is a device structure diagram of a detection device of a sensor according to an embodiment of the present application, where the device includes an acquisition unit 401, a determination unit 402, an acquisition unit 403, and a detection unit 404:
the acquisition unit 401 is configured to acquire an actual value of a downstream pressure and an actual value of a pressure difference of a particulate trap of a vehicle when the vehicle is in a parking state; the pressure differential is used to identify a difference in upstream and downstream pressures of the particulate trap;
the determining unit 402 is configured to determine a downstream pressure measurement value according to the downstream pressure actual value, and determine a differential pressure measurement value according to the differential pressure actual value;
the acquiring unit 403 is configured to acquire a pre-calibrated downstream pressure reference value and a pressure difference reference value;
the detecting unit 404 is configured to detect whether there is a collecting offset of a differential pressure sensor of the particle trap according to a relationship between the downstream pressure measurement value and the downstream pressure reference value and a relationship between the differential pressure measurement value and the differential pressure reference value.
In a possible implementation manner, the detection unit is further configured to detect that a collecting offset exists in a differential pressure sensor of the particle trap if a difference between the downstream pressure measurement value and the downstream pressure reference value is smaller than a preset threshold value, and an absolute value of the differential pressure measurement value is greater than the differential pressure reference value.
In a possible implementation manner, the apparatus further includes a calibration unit:
the calibration unit is used for calibrating the downstream pressure reference value according to the downstream pressure actual value acquired when the vehicle is in the parking state when the particle catcher is used in the vehicle for the first time;
the calibration unit is further used for calibrating the differential pressure reference value according to the differential pressure actual value acquired when the vehicle is in the parking state when the particle catcher is used in the vehicle for the first time.
In a possible implementation manner, the collecting unit is further configured to continuously collect a preset number of downstream pressure actual values and a preset number of pressure difference actual values of the particle trap;
the determining unit is further configured to determine an average value of the preset number of downstream pressure actual values as the downstream pressure measurement value, and determine an average value of the preset number of differential pressure actual values as the differential pressure measurement value.
In a possible implementation manner, the detection unit is further configured to detect whether a collection offset exists in a differential pressure sensor of the particulate trap according to a relationship between a downstream pressure target measurement value and the downstream pressure reference value and a relationship between a differential pressure target measurement value and the differential pressure reference value when the number of times that the vehicle is in the parking state is greater than a preset number of times;
wherein the downstream pressure target measurement value is determined from downstream pressure actual values acquired each time the vehicle is in the stopped state, and the differential pressure target measurement value is determined from differential pressure actual values acquired each time the vehicle is in the stopped state.
In a possible implementation manner, the determining unit is further configured to determine an average value of the downstream pressure actual values acquired each time the vehicle is in the parking state as the downstream pressure target measurement value;
the determining unit is further used for determining an average value of the pressure difference actual values acquired each time the vehicle is in the parking state as the pressure difference target measured value.
In a possible implementation manner, the apparatus further includes a configuration unit:
the configuration unit is used for configuring corresponding weights for the downstream pressure actual value and the pressure difference actual value acquired in the parking state according to the occurrence time of the parking state for each parking state;
then, the determining unit is further configured to determine the downstream pressure target measurement value according to the downstream pressure actual value and the weight corresponding to the downstream pressure actual value acquired in each parking state;
the determining unit is further configured to determine the target differential pressure measurement value according to the actual differential pressure value and the corresponding weight thereof collected in each parking state.
In a possible implementation manner, the apparatus further includes an information reporting unit:
and the information reporting unit is used for reporting the offset fault information of the differential pressure sensor after detecting that the differential pressure sensor of the particle trap has acquisition offset.
Therefore, when the vehicle is in a parking state, acquiring a downstream pressure actual value of the vehicle particle trap in the state and a pressure difference actual value of upstream pressure and downstream pressure of the particle trap, determining a downstream pressure measurement value according to the acquired downstream pressure actual value, determining a pressure difference measurement value according to the acquired pressure difference actual value, and acquiring a downstream pressure reference value and a pressure difference reference value which are calibrated in advance; and further detecting whether the differential pressure sensor of the particle trap has acquisition deviation according to the relationship between the downstream pressure measurement value and the downstream pressure reference value and the relationship between the differential pressure measurement value and the differential pressure reference value. The embodiment of the application innovatively provides a detection mechanism for a differential pressure sensor of a particle trap, and a downstream pressure actual value of the particle trap is introduced into the detection mechanism to assist in detecting whether a collecting offset exists in a differential pressure actually measured by the differential pressure sensor. Specifically, in the detection mechanism, whether the differential pressure sensor has the acquisition offset is detected based on a relationship between a downstream pressure measurement value (determined from a downstream pressure actual value) and a downstream pressure reference value, and a relationship between a differential pressure measurement value (determined from a differential pressure actual value) and a differential pressure reference value; on the basis that the relation between the downstream pressure measurement value and the downstream pressure reference value can reflect whether the detected downstream pressure is normal or not, the relation between the differential pressure measurement value and the differential pressure reference value can reflect whether the detected differential pressure is normal or not, and whether the actual measurement values of the two parameters are normal or not has a close correlation relationship, the accuracy of the detection result can be effectively ensured through the detection mechanism provided by the embodiment of the application.
For the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above detailed description is provided for a method and an apparatus for detecting a sensor according to embodiments of the present application, and specific examples are applied herein to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understanding the method of the present application. Also, variations in the specific embodiments and applications of the methods of the present application will occur to those skilled in the art.
In summary, the present disclosure should not be construed as limiting the present application, and any changes or substitutions that can be easily conceived by one skilled in the art within the technical scope of the present disclosure should be covered within the protection scope of the present application. Moreover, the present application can be further combined to provide more implementations on the basis of the implementations provided by the above aspects.
Claims (9)
1. A method of detecting a sensor, the method comprising:
when a vehicle is in a parking state, acquiring a downstream pressure actual value and a pressure difference actual value of a particle trap of the vehicle; the pressure differential is used to identify a difference in upstream and downstream pressures of the particulate trap;
determining a downstream pressure measurement value according to the downstream pressure actual value, and determining a differential pressure measurement value according to the differential pressure actual value;
acquiring a pre-calibrated downstream pressure reference value and a pressure difference reference value;
detecting whether a differential pressure sensor of the particle trap has collection deviation according to the relationship between the downstream pressure measurement value and the downstream pressure reference value and the relationship between the differential pressure measurement value and the differential pressure reference value;
the detecting whether the differential pressure sensor of the particle trap has collection deviation according to the relationship between the downstream pressure measurement value and the downstream pressure reference value and the relationship between the differential pressure measurement value and the differential pressure reference value comprises the following steps:
if the difference value between the downstream pressure measurement value and the downstream pressure reference value is smaller than a preset threshold value, and the absolute value of the differential pressure measurement value is larger than the differential pressure reference value, detecting that a differential pressure sensor of the particle trap has acquisition deviation;
or, if the downstream pressure measurement value is in a preset interval and the absolute value of the pressure difference measurement value is greater than the pressure difference reference value, detecting that the pressure difference sensor of the particle trap has acquisition deviation; the lower limit of the preset interval is a lower limit of the downstream pressure, and the upper limit of the preset interval is the reference value of the downstream pressure.
2. Method according to claim 1, characterized in that the downstream pressure reference value is calibrated by:
when the particle catcher is used in the vehicle for the first time, calibrating the downstream pressure reference value according to the downstream pressure actual value acquired when the vehicle is in the parking state;
the pressure difference reference value is calibrated by the following method:
when the particle catcher is used in the vehicle for the first time, the pressure difference reference value is calibrated according to the pressure difference actual value acquired when the vehicle is in the parking state.
3. The method of claim 1, wherein the collecting the actual value of the pressure and the actual value of the pressure difference downstream of the particulate trap of the vehicle comprises:
continuously collecting the downstream pressure actual values and the pressure difference actual values of the particle catcher according to the preset number;
then, the determining a downstream pressure measurement value according to the downstream pressure actual value and determining a differential pressure measurement value according to the differential pressure actual value includes:
and determining the average value of the downstream pressure actual values of the preset number as the downstream pressure measured value, and determining the average value of the differential pressure actual values of the preset number as the differential pressure measured value.
4. The method of claim 1, wherein detecting whether an acquisition offset exists for a differential pressure sensor of the particulate trap based on a relationship between the downstream pressure measurement and the downstream pressure reference and a relationship between the differential pressure measurement and the differential pressure reference comprises:
when the number of times that the vehicle is in the parking state is larger than the preset number of times, detecting whether a differential pressure sensor of the particle trap has acquisition offset or not according to the relationship between a downstream pressure target measurement value and the downstream pressure reference value and the relationship between a differential pressure target measurement value and the differential pressure reference value;
wherein the downstream pressure target measurement value is determined from downstream pressure actual values acquired each time the vehicle is in the stopped state, and the differential pressure target measurement value is determined from differential pressure actual values acquired each time the vehicle is in the stopped state.
5. The method of claim 4, wherein the downstream pressure target measurement is determined by:
determining an average value of downstream pressure actual values acquired each time the vehicle is in the parking state as the downstream pressure target measurement value;
the target differential pressure measurement is determined by:
and determining the average value of the pressure difference actual values acquired when the vehicle is in the parking state every time as the pressure difference target measurement value.
6. The method of claim 4, further comprising:
for each parking state, configuring corresponding weights for the downstream pressure actual value and the differential pressure actual value acquired in the parking state according to the occurrence time of the parking state;
then, the downstream pressure target measurement is determined by:
determining the downstream pressure target measurement value according to the downstream pressure actual value and the corresponding weight thereof collected in each parking state;
the target differential pressure measurement is determined by:
and determining the target differential pressure measurement value according to the actual differential pressure value acquired in each parking state and the corresponding weight of the actual differential pressure value.
7. The method of any one of claims 1-6, wherein the differential pressure sensor is a smart sensor;
and acquiring the downstream pressure actual value and the differential pressure actual value by utilizing the intelligent sensor.
8. The method of any one of claims 1-6, further comprising, after detecting an acquisition offset of a differential pressure sensor of the particle trap:
and reporting the offset fault information of the differential pressure sensor.
9. The detection device of the sensor is characterized by comprising an acquisition unit, a determination unit, an acquisition unit and a detection unit:
the collecting unit is used for collecting a downstream pressure actual value and a pressure difference actual value of a particle trap of the vehicle when the vehicle is in a parking state; the pressure differential is used to identify a difference in upstream and downstream pressures of the particulate trap;
the determining unit is used for determining a downstream pressure measurement value according to the downstream pressure actual value and determining a differential pressure measurement value according to the differential pressure actual value;
the acquisition unit is used for acquiring a pre-calibrated downstream pressure reference value and a pressure difference reference value;
the detection unit is used for detecting whether a differential pressure sensor of the particle trap has acquisition deviation or not according to the relationship between the downstream pressure measurement value and the downstream pressure reference value and the relationship between the differential pressure measurement value and the differential pressure reference value;
the detection unit is further configured to:
if the difference value between the downstream pressure measurement value and the downstream pressure reference value is smaller than a preset threshold value, and the absolute value of the differential pressure measurement value is larger than the differential pressure reference value, detecting that a differential pressure sensor of the particle trap has acquisition deviation;
or, if the downstream pressure measurement value is in a preset interval and the absolute value of the pressure difference measurement value is greater than the pressure difference reference value, detecting that the pressure difference sensor of the particle trap has acquisition deviation; the lower limit of the preset interval is a lower limit of the downstream pressure, and the upper limit of the preset interval is the reference value of the downstream pressure.
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