CN114910611A - Detection system and detection method suitable for remote emission monitoring system of motor vehicle - Google Patents
Detection system and detection method suitable for remote emission monitoring system of motor vehicle Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 150
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 72
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Abstract
The present invention provides a detection system comprising: the first detection mechanism is detachably arranged on the motor vehicle and is suitable for detecting first data of the motor vehicle and acquiring vehicle information of the motor vehicle; the handheld terminal is in communication connection with the first detection mechanism and is suitable for receiving the first data and the vehicle information; and the first platform is in communication connection with the handheld terminal and is suitable for receiving the first data and the vehicle information sent by the handheld terminal, calling second data collected by a second platform in communication connection with the remote emission monitoring system of the motor vehicle according to the vehicle information, and judging the consistency of the first data and the second data so as to determine the effectiveness of the remote emission monitoring system of the motor vehicle. The invention also provides a detection method.
Description
Technical Field
The invention relates to the technical field of tail gas detection of motor vehicles, in particular to a detection system and a detection method suitable for a remote emission monitoring system of a motor vehicle.
Background
The pollution from mobile sources is the main source of urban air pollution, and especially the nitrogen oxides and PM2.5 emitted from some heavy diesel vehicles account for a large proportion of the pollution from all mobile sources.
Because heavy-duty car is used for long-distance transport mostly, mostly have the characteristics that the flow range is big, use intensity is big, the row of bicycle enlargies to right, traditional fixed point detection mode has great limitation. In order to improve the supervision of heavy vehicles, more and more heavy vehicles are provided with remote emission monitoring systems so as to remotely detect the exhaust emission of the heavy vehicles in a daily running state.
Currently, most of remote emission monitoring systems include a second detection mechanism, a second on-board diagnostic system and a monitoring platform, the second detection mechanism is adapted to detect exhaust emission data of heavy vehicles in real time, the second on-board diagnostic system is adapted to detect a data stream of an engine of the motor vehicle and/or a data stream of fault information of the motor vehicle, and the monitoring platform is adapted to collect data and data streams uploaded by the second detection mechanism and/or the second on-board diagnostic system to monitor emission conditions of the heavy vehicles. However, this also puts a demand on the authenticity of the exhaust emission data collected by the remote emission monitoring system, and therefore, a technical means for detecting the remote emission monitoring system of the motor vehicle needs to be provided.
Disclosure of Invention
In view of the prior art, the present invention provides a detection system and a detection method suitable for a remote emission monitoring system of a motor vehicle, which are used to at least partially solve the above technical problems.
In order to achieve the above object, there is provided as the present disclosure a detection system including: the detection mechanism is detachably arranged on the motor vehicle and is suitable for detecting first data of the motor vehicle and acquiring vehicle information of the motor vehicle; the handheld terminal is in communication connection with the detection mechanism and is suitable for receiving the first data and the vehicle information; and the first platform is in communication connection with the handheld terminal and is suitable for receiving the first data and the vehicle information sent by the handheld terminal, calling second data collected by a second platform in communication connection with a remote emission monitoring system of the motor vehicle according to the vehicle information, and performing consistency judgment on the first data and the second data to determine the effectiveness of the remote emission monitoring system of the motor vehicle.
In an exemplary embodiment, the detection mechanism includes: the tail gas detection unit is arranged on an exhaust pipe of the motor vehicle and is suitable for detecting the emission information of the motor vehicle; the rotating speed detection unit is arranged on the motor vehicle and is suitable for detecting the rotating speed of an engine of the motor vehicle; the first vehicle-mounted diagnosis system unit is arranged on the motor vehicle and is suitable for detecting data flow of an engine of the motor vehicle and/or data flow of fault information of the motor vehicle; and the first transmission unit is in communication connection with the tail gas detection unit, the rotating speed detection unit, the first vehicle-mounted diagnosis system unit and the handheld terminal, and is suitable for acquiring at least one of the emission information, the rotating speed, the data stream of the engine and the data stream of the fault information of the motor vehicle to generate first data and transmitting the first data to the handheld terminal.
In an exemplary embodiment, the exhaust gas detection unit includes: the nitrogen oxide detector is communicated with the exhaust port of the exhaust pipe and is suitable for detecting the concentration of the nitrogen oxide exhausted from the exhaust port; the temperature sensor is arranged on the exhaust pipe and is suitable for detecting the temperature of the exhaust pipe; a flow meter in communication with the exhaust pipe and adapted to detect a flow rate of a fluid within the exhaust pipe; and the acquisition module is in communication connection with the nitrogen oxide detector, the temperature sensor and the flowmeter and is suitable for acquiring at least one of concentration, temperature and flow so as to generate the emission information.
In an exemplary embodiment, the detection mechanism further includes a positioning module disposed on the motor vehicle and adapted to obtain position data of the exhaust pipe.
In an exemplary embodiment, the rotation speed detecting unit includes an engine tachometer, and is in communication connection with a cigarette lighter of the motor vehicle, and is adapted to collect an output current of the cigarette lighter to obtain the engine rotation speed.
In an exemplary embodiment, the present disclosure also provides a detection method, including: installing a detection mechanism on a motor vehicle provided with a motor vehicle remote detection discharge system to be detected, and establishing a communication relation with a first platform through a handheld terminal; detecting first data of the motor vehicle and acquiring vehicle information of the motor vehicle through the detection mechanism, and uploading the first data and the vehicle information to the first platform; the first platform calls the second data by a second platform according to the vehicle information; and the first platform judges the consistency of the first data and the second data.
In an exemplary embodiment, the method further includes the step of transmitting, by the first platform, a result of the consistency determination to a handheld terminal.
In an exemplary embodiment, the detecting the first data of the motor vehicle and collecting the vehicle information of the motor vehicle by the detection mechanism includes: starting the motor vehicle to a preset detection condition; and acquiring at least one of emission information, rotating speed, data flow of an engine and data flow of fault information of the motor vehicle through the detection mechanism to generate first data, and transmitting the first data to the handheld terminal.
In an exemplary embodiment, the detection condition includes a coolant temperature of the vehicle being greater than 70 degrees celsius.
In an exemplary embodiment, the first platform performing the consistency determination on the first data and the second data comprises: selecting the second data according to the acquisition time of the first data, and aligning the data according to a time axis; performing data cleaning on the aligned data to obtain a data set; performing confidence calculation on the data set; performing consistency calculation on the data set; and performing consistency judgment on the first data and the second data based on the result of the consistency calculation.
According to the detection system and the detection method disclosed by the invention, a detection mechanism, a handheld terminal and a first platform are provided for the motor vehicle outside a motor vehicle remote emission monitoring system installed on the motor vehicle. Under the running or simulated running state of the motor vehicle, the vehicle information of the motor vehicle and the data of the tail gas emission are detected to obtain first data, and the consistency judgment is carried out on second data acquired by the motor vehicle remote emission monitoring system through the first data set, so that the normal running of the motor vehicle remote emission monitoring system and the accuracy of the acquired second data are detected.
Drawings
FIG. 1 is a block diagram of a detection system according to an exemplary embodiment of the present invention;
FIG. 2 is a flow chart of a detection method according to an exemplary embodiment of the present invention;
FIG. 3 is a flow chart of the exemplary embodiment shown in FIG. 2 for testing an on-board diagnostic system of a remote emission monitoring system of a motor vehicle; and
fig. 4 is a flow chart of the detection of the exemplary embodiment shown in fig. 3 for a motor vehicle remote emission monitoring system for heavy vehicles.
In the above figures, the reference numerals have the following meanings in detail:
1. a motor vehicle;
2. a first detection mechanism;
3. a handheld terminal;
4. a first platform; and
5. a second platform.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components. All terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
In this document, unless otherwise specifically stated, directional terms such as "upper", "lower", "left", "right", "inside", "outside", and the like are used to indicate orientations or positional relationships based on the illustrated drawings, and are merely for convenience in describing the present invention, and do not indicate or imply that the referenced device, element, or component must have a particular orientation, be constructed or operated in a particular orientation. It should be understood that when the absolute positions of the described objects are changed, the relative positional relationships they represent may also change accordingly. Accordingly, these directional terms should not be construed as limiting the present invention.
Where a convention analogous to "at least one of A, B and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B and C" would include but not be limited to systems that have a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.). Where a convention analogous to "A, B or at least one of C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B or C" would include but not be limited to systems that have a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.).
FIG. 1 is a block diagram of a detection system according to an exemplary embodiment of the present invention.
An exemplary embodiment of the present invention provides a detection system, as shown in fig. 1, including a first detection mechanism 2, a handheld terminal 3, and a first platform 4. The first detection mechanism 2 is detachably mounted on the motor vehicle 1 provided with the remote detection exhaust system of the motor vehicle 1 to be detected, and is suitable for detecting first data of the motor vehicle 1 and acquiring vehicle information of the motor vehicle 1. The hand-held terminal 3 is in communication connection with the first detection mechanism 2 and is adapted to receive the first data and the vehicle information. The first platform 4 is in communication connection with the handheld terminal 3 and is suitable for receiving first data and vehicle information sent by the handheld terminal 3, calling second data collected by a second platform 5 in communication connection with the remote emission monitoring system of the motor vehicle according to the vehicle information, and performing consistency judgment on the first data and the second data to determine the effectiveness of the remote emission monitoring system of the motor vehicle.
In one exemplary embodiment, the detection system is adapted to detect a remote emission monitoring system of a motor vehicle.
In detail, the remote emission monitoring system of the automobile includes a second detection mechanism, a second On-Board Diagnostic (OBD) unit, and a second platform 5.
Further, the second On-Board Diagnostic (OBD) unit is communicatively connected to the acquisition port of the On-Board Diagnostic (OBD) unit of the motor vehicle 1, and the second detection mechanism is communicatively connected to the second On-Board Diagnostic and the second platform 5, and is adapted to upload the second data acquired by the second On-Board Diagnostic (OBD) unit to the second platform 5.
In an exemplary embodiment, the handheld terminal 3 and the first detection mechanism 2 include, but are not limited to, a connection via Bluetooth (R).
In detail, during the detection process, the handheld terminal 3 is placed in the motor vehicle 1 on board, so that the first detection mechanism 2 and the handheld terminal 3 are within a range that can be covered by bluetooth.
Further, the handheld terminal 3 can be carried by an operator (for example, the operator carries the handheld terminal 3 on the vehicle 1 during the detection process) or fixed on the vehicle 1. It should be understood that embodiments of the present disclosure are not limited thereto.
For example, the handheld terminal 3 and the first detection mechanism 2 are connected by means including, but not limited to, 4G, 5G or other wireless communication means.
For another example, the hand-held terminal 3 and the first detection mechanism 2 are connected by wired communication. The hand-held terminal 3 can also be placed in other locations than the motor vehicle 1 based on the telecommunication mode.
In an exemplary embodiment, the handheld terminal 3 includes hardware devices and built-in processing software.
In an exemplary embodiment, the handheld terminal 3 includes, but is not limited to, a cell phone, a tablet computer, a notebook computer, a work machine, or other electronic device.
In detail, the electronic device has processing software built therein. In such an embodiment, only a suitable software device needs to be transferred to the existing electronic device to acquire the first data and establish a connection relationship with the first platform 4, and no additional configuration of the other handheld terminal 3 is required.
In another exemplary embodiment, the handheld terminal 3 may employ electronics dedicated to remotely testing an emissions system of a motor vehicle.
In detail, the hardware device includes, but is not limited to, a second transmission unit, a display unit, a storage unit, a buffer unit, and a processing unit. The second transmission unit is in communication connection with the first transmission unit and the first platform 4, and is suitable for establishing a communication relationship with the first detection mechanism 2 and/or the first platform 4 and transmitting data. The storage unit is suitable for storing data, and the cache unit is suitable for data exchange. The display unit is adapted to visualize the data and/or to display the result of the consistency determination. The pins of the processing unit are connected with the second transmission unit, the display unit, the storage unit and the cache unit, and are suitable for reading information, sending instructions, compiling instructions and other interactive functions.
Further, the hand-held terminal 3 is internally provided with an SIM card and is suitable for communication connection with the first platform in a GPRS mode.
According to an embodiment of the present disclosure, as shown in fig. 1, the first detection mechanism 2 includes, but is not limited to, an exhaust gas detection unit, a rotation speed detection unit, a first On-Board Diagnostic (OBD) unit, and a transmission unit. The exhaust gas detection unit is arranged on an exhaust pipe of the motor vehicle 1 and is suitable for detecting the emission information of the motor vehicle 1. The rotation speed detection unit is provided on the motor vehicle 1 and adapted to detect the engine rotation speed of the motor vehicle 1. The first on-board diagnostic system unit is arranged on the motor vehicle 1 and is suitable for detecting a data stream of an engine of the motor vehicle 1 and/or a data stream of fault information of the motor vehicle 1. The first transmission unit is in communication connection with the tail gas detection unit, the rotating speed detection unit, the first vehicle-mounted diagnosis system unit and the handheld terminal 3, and is suitable for acquiring at least one of emission information, rotating speed, data flow of an engine and data flow of fault information of the motor vehicle 1 to generate first data and transmitting the first data to the handheld terminal 3.
In an exemplary embodiment, the On-Board diagnostics (OBD) unit of the first vehicle is communicatively connected to the acquisition port of the On-Board diagnostics (OBD) of the motor vehicle 1. In such an embodiment, the first On-Board Diagnostic (OBD) unit is adapted to collect data streams of the engine and/or the On-Board Diagnostic (OBD).
In an exemplary embodiment, the vehicle information includes, but is not limited to, a frame number, a registration number, and identity information entered at the first and second platforms that is suitable for identifying the vehicle.
In detail, the vehicle information may be directly collected and uploaded to the first platform through an On-Board Diagnostic (OBD) unit. Or the vehicle information may be manually entered or queried by an operator for registration as a verification procedure.
In an exemplary embodiment, the first On-Board Diagnostic (OBD) unit and/or the second On-Board Diagnostic (OBD) unit includes, but is not limited to, an OBD data stream detector.
In detail, data items of the data stream acquired by the OBD data stream detector include, but are not limited to (see table below).
Table 1 data items collected by OBD data stream detector
| Data item | Data frequency Hz |
| Vehicle speed | 1 |
| Direct measurement or estimation of atmospheric pressure | 1 |
| Maximum reference torque of engine | Fixed value, upload at registration |
| Net output torque of engine | 1 |
| Friction torque as a percentage of the engine's maximum reference torque | 1 |
| Rotational speed of engine | 1 |
| Fuel flow of engine | 1 |
| NO X Sensor output | 1 |
| SCR inlet temperature as applicable | 1 |
| SCR outlet temperature as applicable | 1 |
| Pressure difference of DPF such asIs applicable to | 1 |
| Air inflow read by air mass flow sensor | 1 |
| The balance of the reactants | 1 |
| Oil tank liquid level | 1 |
| Engine coolant temperature | 1 |
| Latitude and longitude | 1 |
According to an embodiment of the present disclosure, as shown in fig. 1, the exhaust gas detection unit includes a nitrogen oxide detector, a temperature sensor, a flow meter, and an acquisition module. The nitrogen oxide detector is communicated with the exhaust port of the exhaust pipe and is suitable for detecting the concentration of the nitrogen oxide discharged from the exhaust port. The temperature sensor is arranged on the exhaust pipe and is suitable for detecting the temperature of the exhaust pipe. The flowmeter is communicated with the exhaust pipe and is suitable for detecting the flow of the fluid in the exhaust pipe. The acquisition module is in communication connection with the nitrogen oxide detector, the temperature sensor and the flowmeter and is suitable for acquiring at least one of concentration, temperature and flow to generate emission information.
In an exemplary embodiment, a nitrogen oxide (NOx) detector is disposed on a tubular member.
In detail, the tubular member is constructed in a hollow cylindrical structure.
Further, the tubular member is in communication with the exhaust pipe such that the nitrogen oxide detector collects at least a portion of the exhaust output from the exhaust port.
Further, the nitrogen oxide (NOx) detector has a range of 0ppm to 1500ppm with a relative error of + -10. It should be understood that embodiments of the present disclosure are not limited thereto.
For example, the nitrogen oxide detector may collect and/or calculate the concentration of nitrogen oxides in an indirect manner.
For another example, the upper limit of the range includes, but is not limited to 1550, 1600, 1650 or other values, and the relative error includes, but is not limited to ± 5, ± 15, ± 20 or other values, so as to satisfy the range and accuracy of the exhaust gas detection.
In an exemplary embodiment, the temperature sensor is disposed on the exhaust pipe (inside or outside).
In detail, the response time of the temperature sensor is less than 5.0 seconds.
Furthermore, the sampling frequency is more than or equal to 1Hz, and the minimum resolution is 0.1 ℃. It should be understood that embodiments of the present disclosure are not limited thereto.
For example, the response time of the temperature sensor is 5.5 seconds, 6 seconds, 6.5 seconds, 7 seconds, or other time greater than 5.0 seconds.
In one illustrative embodiment, the flow meter includes, but is not limited to, a pitot tube flow meter.
In detail, the pitot tube flowmeter is connected with the tubular element, a probe of the pitot tube flowmeter is inserted into the center of the tubular element, a total pressure hole of the pitot tube flowmeter is aligned with the inflow direction of fluid, a static pressure hole of the pitot tube flowmeter is aligned with the outflow direction of the fluid, the difference between the total pressure and the static pressure is actually measured differential pressure (total pressure-static pressure) at the center of the pipeline, then a standard differential pressure at the point is fitted by an airflow calibration curve of the probe, and the flow rate of the fluid is calculated according to the standard differential pressure.
In an exemplary embodiment, the acquisition module includes, but is not limited to, a Bluetooth (R) transmission module.
In detail, Bluetooth (Bluetooth) send module and first transmission unit communication connection, are applicable to the signal of gathering in the transmission nitrogen oxide detector, temperature sensor and the flowmeter.
According to an embodiment of the present disclosure, as shown in fig. 1, the first detection mechanism 2 further includes a positioning module disposed on the motor vehicle 1 and adapted to acquire position data of the exhaust pipe.
In an exemplary embodiment, the positioning module includes, but is not limited to, a GPS module communicatively coupled to the handheld terminal 3 and/or the first platform 4 and adapted to collect information about the location of the exhaust pipe (e.g., the vehicle 1). It should be understood that embodiments of the present disclosure are not limited thereto.
In detail, the precision error of the GPS module is less than 1 meter, and the acquisition frequency is more than or equal to 1 Hz.
For example, positioning includes using Beidou, Galileo or other modules (systems) with positioning functions.
According to an embodiment of the present disclosure, the rotation speed detection unit comprises an engine tachometer in communication with the cigarette lighter of the motor vehicle 1. The device is suitable for collecting the output current of the cigarette lighter so as to obtain the rotating speed of the engine.
In an exemplary embodiment, as shown in FIG. 1, the speed detection unit includes, but is not limited to, a speed sensor.
In detail, a revolution speed sensor is communicatively connected to the cigarette lighter of the motor vehicle 1 to convert the engine revolution speed into electric power, so that the engine revolution speed is indirectly collected. Such an embodiment facilitates a quick assembly of the first detection means 2 and the motor vehicle 1. It should be understood that embodiments of the present disclosure are not limited thereto.
For example, the speed detection unit includes, but is not limited to, a direct acquisition device that employs direct measurement of engine speed.
In an exemplary embodiment, the detection system is adapted to detect a remote emission monitoring system for a motor vehicle of a heavy-duty vehicle. Heavy vehicles include, but are not limited to, at least one of tractors (e.g., semi-tractor vehicles), utility vehicles (e.g., tank cars, lift trucks), trucks, and dump trucks.
In an exemplary embodiment, the motor vehicle remote emission monitoring system for heavy-duty vehicles comprises a second detection mechanism, a second On-Board Diagnostic (OBD) unit, and a second platform 5. The detection system comprises a first detection mechanism 2, a handheld terminal 3 and a first platform 4. The first platform 4 includes, but is not limited to, a cloud service platform communicatively connected to the handheld terminal 3, and the second platform 5 includes, but is not limited to, a monitoring platform provided by an environmental protection department or an automobile enterprise.
In detail, the On-Board Diagnostic (OBD) unit is in communication connection with the On-Board Diagnostic (OBD) acquisition port of the heavy vehicle, and is adapted to acquire the data stream of the engine of the heavy vehicle and the data stream of the fault information of the motor vehicle 1. The second detection mechanism is in communication connection with an On-Board Diagnostic (OBD) unit and the monitoring platform, and is suitable for uploading the acquired data stream to the monitoring platform through a General Packet Radio Service (GPRS). The monitoring platform has at least one of functions of displaying, storing and processing the second data.
Further, the first detection mechanism 2 of the detection system includes an exhaust gas detection unit, a rotation speed detection unit, and an On-Board Diagnostic (OBD) unit. Tail gas detection unit tail gas detection unit includes nitrogen oxide detector, temperature sensor, flowmeter and collection module. The nitrogen oxide detector, the flow meter and the temperature sensor are all arranged on the exhaust pipe, and the acquisition module is in communication connection with the nitrogen oxide detector, the flow meter and the temperature sensor and is suitable for acquiring the concentration of nitrogen oxide at an exhaust port of the heavy truck, the temperature of the exhaust pipe and the flow of fluid. The acquisition module is in communication connection with the handheld terminal 3 in a Bluetooth (Bluetooth) connection mode.
Furthermore, the handheld terminal 3 is in communication connection with the cloud service platform and is suitable for sending a connection request, establishing a connection relation, uploading data and receiving data.
Furthermore, the monitoring platform is in two-way communication connection with the cloud service platform and is suitable for two-way data transmission.
FIG. 2 is a flow chart of a detection method according to an exemplary embodiment of the present invention.
The present disclosure also provides a detection method based on a detection system, as shown in fig. 2, including installing a first detection mechanism 2 on a motor vehicle 1 provided with a remote detection exhaust system of the motor vehicle 1 to be detected, and establishing a communication relationship with a first platform 4 through a handheld terminal 3. The first detection mechanism 2 detects first data of the motor vehicle 1, collects vehicle information of the motor vehicle 1, and uploads the first data and the vehicle information to the first platform 4. The first platform 4 calls the second data from the second platform 5 according to the vehicle information. The first platform 4 performs consistency determination on the first data and the second data.
In an exemplary embodiment, the first detection means 2 comprises an exhaust gas detection unit, a rotational speed detection unit and a first on-board diagnostic system unit.
In detail, the exhaust gas detection unit is disposed On an exhaust pipe of the motor vehicle 1, the rotation speed detection unit is in communication connection with a cigarette lighter of the motor vehicle 1, and the first On-Board Diagnostic (OBD) unit is in communication connection with a collection port of the On-Board Diagnostic (OBD) unit of the motor vehicle 1.
In an exemplary embodiment, the detection method further includes commissioning the detection system.
In detail, commissioning a detection system includes:
and respectively starting the handheld terminal 3, the tail gas detection unit, the rotating speed detection unit and the first vehicle-mounted diagnosis system unit.
The handheld terminal 3 establishes a communication relation with the tail gas detection unit, the rotating speed detection unit and the first vehicle-mounted diagnosis system.
Starting the motor vehicle 1 until the temperature of the cooling liquid is higher than 70 ℃, and establishing a communication relationship between the handheld terminal 3 and the first platform 4 (the establishment of the communication relationship is characterized in that the handheld terminal 3 can upload data to the first platform 4).
According to the embodiment of the present disclosure, as shown in fig. 2, the detection method further includes the first platform 4 transmitting the result of the consistency determination to the handheld terminal 3.
According to an embodiment of the present disclosure, as shown in fig. 2, detecting the first data of the motor vehicle 1 by the first detecting means 2 and acquiring the vehicle information of the motor vehicle 1 includes starting the motor vehicle 1 to a preset detection condition, and acquiring at least one of emission information, a rotation speed, a data stream of the engine, and a data stream of fault information of the motor vehicle 1 by the first detecting means 2 to generate the first data, and transmitting the first data to the handheld terminal 3.
According to an embodiment of the present disclosure, as shown in fig. 2, the detection condition includes that the temperature of the coolant of the motor vehicle 1 is greater than 70 degrees celsius.
In an exemplary embodiment, for the motor vehicle 1 having the driving condition, the detection (collecting and recording the first data) can be started by the handheld terminal 3 when the coolant of the motor vehicle 1 is greater than 70 degrees celsius, the detection condition further includes that the motor vehicle 1 drives for a distance not less than 3 km/h after the detection is started, and the average speed of the motor vehicle 1 is not less than 30km/h during driving.
In another exemplary embodiment, for the motor vehicle 1 without driving condition, the detection (collecting and recording the first data) can be started through the handheld terminal 3 when the coolant of the motor vehicle 1 is greater than 70 degrees celsius, and after the detection is started, the detection condition further includes the detection in a free acceleration mode, during which the driver repeatedly steps on the accelerator, and the accumulated test time should be not less than 3 minutes. In such an embodiment, appropriate detection conditions are set depending on whether or not the vehicle 1 has driving conditions.
According to an embodiment of the disclosure, as shown in fig. 2, the first platform 4 performs consistency determination on the first data and the second data, including selecting the second data according to the acquisition time of the first data and performing data alignment according to a time axis. And performing data cleaning on the aligned data to obtain a data set. A confidence calculation is performed on the data set. Performing consistency calculation on the data set; and performing consistency judgment on the first data and the second data based on the result of the consistency calculation.
In an exemplary embodiment, selecting the second data based on a time of acquisition of the first data (including but not limited to at least one of engine speed, nox concentration, exhaust flow, exhaust temperature, and data flow) and aligning the second data based on a time axis comprises:
matching the first data and the second data according to the acquisition time;
aligning the first data and the second data by moving n values forward or backward based on the first data and the second data of the same acquisition time and calculating a correlation coefficient for each alignment, the correlation coefficient calculation using the following formula 1:
in formula 1, X is characterized as a second datum; y is characterized as first data; var (X) is the variance of X, Var (Y) is the variance of Y, and Cov (X, Y) is the covariance of X and Y.
Establishing a discriminant based on the first relation coefficient of the data alignment, the second relation coefficient of the previous alignment and the second relation coefficient of the next alignment, wherein the discriminant is as the following formula 2:
in the formula 2, the first step is,
respectively characterized by a first relation coefficient, a second relation coefficient and a third relation coefficient;
further, if the discriminant (expression 2) is satisfied, continuing the alignment, and if the discriminant (expression 2) is not satisfied, stopping the alignment;
for the data of the dissatisfaction discriminant (equation 2), the optimal alignment position is sought by adopting a dichotomy, and the pseudo code for solving the optimal alignment comprises the following steps: under the condition that n is greater than or equal to 1, if rho tn is greater than rho tn-1, moving data (first data and/or second data), wherein the moving distance is n/2; if ρ tn is smaller than ρ tn +1, the data is shifted forward or backward until the optimal solution (optimal alignment position) is output.
In an exemplary embodiment, the data cleansing the aligned data to obtain the data set includes:
data which does not satisfy the discriminant (equation 2) is cleaned, and the cleaning formula is as follows 3:
in formula 3, item is characterized as each cleaned data value; i is characterised by the items, item, that need to be cleaned i,o The representation is an original value after data analysis; precision i Characterized by the accuracy, bias, of each item of data i Characterizing each item of data offset;
characterised by representing an invalid value "OxFF, OxFF" or "OxFF", range min Characterized as representing a data range minimum characterized as; range max And represents the maximum value of the data range.
In an exemplary embodiment, performing confidence calculations on a data set includes:
a confidence level of 0.05 was set and the maximum of the second data was calculated as follows, equations 4 and 5:
(n+1)×P 0.95 j + g formula 4
P 0.95 ＝X j +g×[X j+1 -X j ]Formula 5
In the formulas 4 and 5, n is characterized by the number of numerical values participating in calculation; x j Characterizing the jth number in the sequence; g is characterized as the fractional part.
Calculating a 95% quantile value of a first data set formed by the first data and a second data set formed by the second data, and calculating a ratio of the 95% quantile values, as shown in the following formula 6:
in the formula: x is characterized as second data; y is characterized as the first data.
In an exemplary embodiment, performing the consistency calculation on the data set includes:
performing linear regression fitting by using a least square method, wherein a function expression of the linear regression is as follows 7:
y ═ mx + b formula 7
In equation 7, y is characterized as the first data, m is characterized as the slope of the regression line, x is characterized as the second data, and b is characterized as the intercept of the regression line.
In an exemplary embodiment, the consistency determination of the first data and the second data based on the result of the consistency calculation includes:
selecting a first target interval, a second target interval and a third target interval which are suitable for the data items based on the data items;
in detail, the first target interval is characterized as a target interval of a coefficient of relationship between the first data and the second data, the second target interval is characterized as a target interval of a ratio of 95% quantiles of the first data and the second data, and the third target interval is characterized as a target interval of a slope of a regression line of the first data and the second data.
And if the consistency calculation results of the first data and the second data are all positioned in the first interval, the second interval and the third interval, judging that the first data and the second data are consistent.
In an exemplary embodiment, the data items include data or data streams collected by the second detection mechanism and the second On-Board Diagnostic (OBD) unit, as shown in tables 2 and 3 below:
TABLE 2 target intervals for data items collected by the second detection mechanism
| Data item | Basis of determination |
| Vehicle speed | ρ>0.95,0.9<m<1.1,0.9<ε<1.1 |
| Rotational speed of engine | ρ>0.95,0.9<m<1.1,0.9<ε<1.1 |
| Exhaust flow rate | ρ>0.95,0.9<m<1.1,0.9<ε<1.1 |
| Output value of NOx sensor | ρ>0.8,0.9<m<1.1,0.9<ε<1.1 |
| Exhaust temperature | ρ>0.95,0.9<m<1.1,0.9<ε<1.1 |
TABLE 3 target intervals for data items collected by the on-board diagnostics system unit
The ρ coefficient of the relationship, m, in tables 2 and 3 characterizes the slope of the regression line, and ε characterizes the ratio of the 95% quantiles of the first and second data.
Further, the acquisition frequency of the first On-Board Diagnostic (OBD) and the second On-Board Diagnostic (OBD) may be different.
FIG. 3 is a flow chart of the exemplary embodiment shown in FIG. 2 for testing an on-board diagnostic system of a remote emission monitoring system of a motor vehicle. Fig. 4 is a flow chart of the detection of the exemplary embodiment shown in fig. 3 for a motor vehicle remote emission monitoring system for heavy vehicles.
In an exemplary embodiment, as shown in FIG. 3, a remote emission monitoring system for a vehicle detects, comprising:
step 1, selecting a vehicle provided with a motor vehicle remote emission monitoring system;
step 2, installing a detection system and preheating the vehicle to achieve a detectable condition;
step 5, uploading the first data to a cloud service platform through the handheld terminal 3, and acquiring second data of the vehicle in the detection period from a supervision platform through the uploaded vehicle information by the cloud service platform;
step 6, consistency judgment is carried out on the first data and the second data in the cloud service platform;
and 7, transmitting the result of the eligibility judgment to the handheld terminal 3 together with the service platform so as to display whether the remote emission monitoring system of the motor vehicle to be detected is qualified.
In detail, as shown in fig. 4, step 3 includes:
step 301: confirming whether the vehicle to be detected is provided with an OBD system (a second vehicle-mounted diagnosis system) and an OBD diagnosis port;
step 302: connecting a first on-board diagnostic system with an OBD diagnostic port of a vehicle;
step 303: placing the vehicle ignition switch in an ON state (instrument panel indicator light ON);
step 304: checking whether the instrument board fault lamp is on (if the instrument board fault lamp is not on, the instrument board fault lamp is firstly eliminated);
step 305: starting an engine of a vehicle;
step 306: the first vehicle-mounted diagnosis system and the OBD system (second vehicle-mounted diagnosis system) establish a communication relation;
step 307: judging whether a communication relation is established or not (if not, searching whether the first vehicle-mounted diagnosis system and the first platform 4 establish the communication relation with the vehicle or other vehicles of the same vehicle type or not, and if the first vehicle-mounted diagnosis system and/or the first platform 4 cannot establish contact with the vehicle according to the searching result, recording that the communication is unsuccessful);
step 308: recording relevant information (including but not limited to fault codes, fault Indicator Lamp states, ready states, automobile fault codes MIL, fault mileage after a mail function Indicator Lamp is lighted) of a second vehicle-mounted diagnostic system data stream through the handheld terminal 3;
step 309: whether the state of the fault indicator on the instrument panel is consistent with the detection state of the first vehicle-mounted diagnosis system or not (if not, recording that the judgment result of the second vehicle-mounted diagnosis system is unqualified);
step 310: whether the automobile fault code on the instrument panel is on (if so, recording that the judgment result of the second vehicle-mounted diagnosis system is unqualified);
step 311: whether the items in the ready state are not completed exceed the preset number of items (including but not limited to 2 items, if yes, the second vehicle-mounted diagnostic system is recorded, and the judgment result is unqualified).
If all of the above steps 301 to 311 pass, the detection of the second on-board diagnostic system is determined to be qualified, and the detection of the second on-board diagnostic system is terminated.
It will be understood by those skilled in the art that various embodiments of the present disclosure and/or features recited in the claims may be combined in several ways and/or combinations, even if such combinations or combinations are not explicitly recited in the present disclosure. In particular, several combinations and/or combinations of the features recited in the various embodiments and/or claims of the present disclosure may be made without departing from the spirit and teachings of the present disclosure. All such combinations and/or associations are within the scope of the present disclosure.
The above embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A detection system adapted to detect a remote emission monitoring system of a motor vehicle, comprising:
the first detection mechanism (2) is detachably arranged on the motor vehicle (1) and is suitable for detecting first data of the motor vehicle (1) and acquiring vehicle information of the motor vehicle (1);
the handheld terminal (3) is in communication connection with the first detection mechanism (2) and is suitable for receiving the first data and the vehicle information; and
the first platform (4) is in communication connection with the handheld terminal (3) and is suitable for receiving the first data and the vehicle information sent by the handheld terminal (3), calling second data collected by a second platform (5) in communication connection with a remote emission monitoring system of the motor vehicle (1) according to the vehicle information, and performing consistency judgment on the first data and the second data to determine the effectiveness of the remote emission monitoring system of the motor vehicle (1);
wherein the first data includes at least one of engine speed, NOx concentration, exhaust flow, exhaust temperature, and data flow.
2. Detection system according to claim 1, characterized in that said first detection means (2) comprise:
the tail gas detection unit is arranged on an exhaust pipe of the motor vehicle (1) and is suitable for detecting the emission information of the motor vehicle (1);
a rotational speed detection unit, which is arranged on the motor vehicle (1) and is suitable for detecting the rotational speed of the engine of the motor vehicle (1);
a first on-board diagnostic system unit, which is arranged on the motor vehicle (1) and is suitable for detecting a data stream of an engine of the motor vehicle (1) and/or a data stream of fault information of the motor vehicle (1); and
the first transmission unit is in communication connection with the tail gas detection unit, the rotating speed detection unit, the first vehicle-mounted diagnosis system unit and the handheld terminal (3), and is suitable for acquiring at least one of emission information, rotating speed, data flow of an engine and data flow of fault information of the motor vehicle (1) to generate first data and transmitting the first data to the handheld terminal (3).
3. The detection system according to claim 2, wherein the exhaust gas detection unit includes:
the nitrogen oxide detector is communicated with the exhaust port of the exhaust pipe and is suitable for detecting the concentration of the nitrogen oxide exhausted from the exhaust port;
the temperature sensor is arranged on the exhaust pipe and is suitable for detecting the temperature of the exhaust pipe;
a flow meter in communication with said exhaust pipe and adapted to detect the flow rate of fluid within said exhaust pipe; and
the acquisition module is in communication connection with the nitrogen oxide detector, the temperature sensor and the flowmeter and is suitable for acquiring at least one of concentration, temperature and flow so as to generate the emission information.
4. The detection system according to claim 2, wherein the detection mechanism further comprises a positioning module, provided on the motor vehicle (1), adapted to acquire position data of the exhaust pipe.
5. The detection system according to claim 2, wherein the rotation speed detection unit comprises an engine tachometer, is in communication connection with a cigarette lighter of the motor vehicle (1), and is adapted to collect an output current of the cigarette lighter to obtain the engine rotation speed.
6. A detection method based on the detection system of any one of claims 1 to 5, comprising:
the method comprises the following steps that a first detection mechanism (2) is arranged on a motor vehicle (1) provided with a motor vehicle (1) to be detected for remote detection of an exhaust system, and a communication relation is established between the first detection mechanism and a first platform (4) through a handheld terminal (3);
detecting first data of the motor vehicle (1) through the first detection mechanism (2), collecting vehicle information of the motor vehicle (1), and uploading the first data and the vehicle information to the first platform (4);
the first platform (4) calls the second data from a second platform (5) according to the vehicle information; and
the first platform (4) performs a consistency determination on the first data and the second data.
7. The detection method according to claim 6, further comprising the first platform (4) transmitting a result of the consistency determination to a handheld terminal (3).
8. The detection method according to claim 6 or 7, wherein the detecting of the first data of the motor vehicle (1) by the first detection means (2) and the collecting of the vehicle information of the motor vehicle (1) comprise:
starting the motor vehicle (1) to a predetermined detection condition; and
at least one of emission information, rotational speed, engine data flow and fault information data flow of the motor vehicle (1) is acquired by the first detection means (2) to generate the first data, and the first data is transmitted to the handheld terminal (3).
9. Detection method according to claim 8, characterised in that said detection conditions comprise a coolant temperature of said motor vehicle (1) greater than 70 degrees Celsius.
10. The detection method according to claim 6 or 7, wherein the first platform (4) performs the consistency determination on the first data and the second data by:
selecting the second data according to the acquisition time of the first data, and aligning the data according to a time axis;
performing data cleaning on the aligned data to obtain a data set;
performing confidence calculation on the data set;
performing consistency calculation on the data set; and
and performing consistency judgment on the first data and the second data based on the result of the consistency calculation.
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