CN111999451A - Automobile exhaust anti-cheating detection system and method based on attitude sensor - Google Patents
Automobile exhaust anti-cheating detection system and method based on attitude sensor Download PDFInfo
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 50
- 239000001301 oxygen Substances 0.000 claims abstract description 50
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 30
- 238000009434 installation Methods 0.000 claims description 27
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 18
- 238000003825 pressing Methods 0.000 claims description 17
- 230000003750 conditioning effect Effects 0.000 claims description 15
- 239000001569 carbon dioxide Substances 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 13
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
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- G—PHYSICS
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- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0031—General constructional details of gas analysers, e.g. portable test equipment concerning the detector comprising two or more sensors, e.g. a sensor array
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- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0037—NOx
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/004—CO or CO2
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Abstract
The invention relates to the technical field of motor vehicle detection lines, and particularly discloses an automobile exhaust anti-cheating detection system and method based on an attitude sensor, wherein the system comprises the following steps: s1, mounting a gas collecting cylinder with a tail gas detection probe on a tail gas pipe of an automobile, wherein the gas collecting cylinder is provided with a posture detection sensor; s2, detecting the concentration of oxygen in real time by the tail gas detection probe, and judging whether the gas collecting cylinder is installed in place by the upper computer system according to the concentration of the oxygen; s3, acquiring attitude data of a current attitude detection sensor as a scale and storing the data after the upper computer system detects that the gas collecting cylinder and the tail gas detection probe are installed in place; s4, starting and detecting the upper computer system; and S5, detecting the attitude data of the attitude detection sensor in real time by the upper computer system while detecting the tail gas, and comparing and judging the detected data with the data of the scale. The tail gas detection anti-cheating method has the advantages of high response speed and accurate judgment, and can greatly reduce the occurrence of cheating.
Description
Technical Field
The invention relates to the technical field of motor vehicle detection lines, in particular to an automobile exhaust anti-cheating detection system and method based on an attitude sensor.
Background
At present, motor vehicle detection in China has a cheating phenomenon, and many motor vehicle detection stations use computer detection cheating software, counterfeit detection data and issue false detection reports in motor vehicle annual inspection safety detection and environment-friendly detection. For market competition, individual detection equipment manufacturers reserve cheating windows on computer software or modify parameter index functions, or directly provide computer detection cheating software for motor vehicle detection stations purchasing detection equipment. The detection station is used for detecting the cheating behavior of the passenger source in a competition manner, so that the market order is disturbed, and the serious hidden danger is brought to the road traffic safety.
In order to solve the above problems, the conventional solution is: a video recording device is added at a detection station, and a detection process video is recorded in the whole process; or at the detection equipment end, a data backup monitoring interface is added at the output end after signal processing, and the detection process data is recorded in the whole process; or at the detection equipment end, a data backup monitoring interface is directly added from the output end of the station sensor, and the detection process data is recorded in the whole process;
the method for recording the detection process video in the whole process provides a basis for actual detection of a field station, but cannot reflect the authenticity of detection data, for example, the integrity and the authenticity of the data detected by a field instrument cannot be ensured through the video.
Therefore, it is necessary to develop a cheating prevention apparatus for a vehicle inspection line to solve the above problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an automobile exhaust anti-cheating detection system and method based on an attitude sensor.
The purpose of the invention is realized by the following technical scheme: an automobile exhaust anti-cheating detection method based on an attitude sensor comprises the following steps:
s1, mounting a gas cylinder for detecting tail gas on a tail gas pipe of the automobile, wherein the gas cylinder is provided with a tail gas detection probe which is arranged in the tail gas pipe of the automobile, and the gas cylinder is provided with a posture detection sensor;
s2, when the gas collecting cylinder and the tail gas detection probe are installed on the tail gas pipe, the tail gas detection probe detects the concentration of oxygen in real time and transmits the detected data to the upper computer system, and the upper computer system judges whether the gas collecting cylinder and the tail gas detection probe are installed in place or not according to the concentration of the oxygen;
s21, acquiring data of the scale by the attitude detection sensor after the automobile idles for 40-50 seconds, detecting the concentration of a compound in tail gas in an automobile tail gas pipe by the tail gas detection probe when the automobile idles, and detecting NO in the compound by the tail gas detection probeXHas a concentration of 0 to 50ppm and CO2Has a concentration of 6-9% and O2When the concentration of the water is 0.8-1.5%, the concentration of CO is 3-10% and the concentration of THC is 300-8000 ppm, the upper computer system judges that the automobile starts to idle, and at the moment, the upper computer system starts to time and acquires data of the scale after timing for 40-50 seconds;
s3, acquiring attitude data of a current attitude detection sensor as a scale and storing the data after the upper computer system detects that the gas collecting cylinder and the tail gas detection probe are installed in place, wherein the attitude data of the attitude detection sensor comprises an X-axis angle, a Y-axis angle and a Z-axis angle;
s4, starting detection by an upper computer system, detecting the tail gas in the tail gas pipe by a tail gas detection probe, and transmitting the detected data to the upper computer for storage;
s5, detecting the attitude data of the attitude detection sensor in real time by the upper computer system while detecting the tail gas, comparing the detected data with the data of the scale to judge whether the gas collecting cylinder falls off, setting a pipe-dropping threshold value by the upper computer system, and judging that the gas collecting cylinder falls off when the absolute values of the differences of the X-axis angle, the Y-axis angle and the Z-axis angle of the attitude detection sensor detected in real time and the X-axis angle, the Y-axis angle and the Z-axis angle corresponding to the data of the scale exceed the pipe-dropping threshold value;
and S51, the upper computer system is provided with a display module, and the display module displays oscillograms of posture changes of the X-axis angle, the Y-axis angle and the Z-axis angle in real time.
Further, in step S5, the pipe-out threshold is 5-7 °.
Further, in the step S5, after the upper computer system judges that the gas cylinder falls off, the upper computer system resets, and then the steps S1-S5 are repeated to perform detection again.
Further, the method for determining whether the gas cylinder and the tail gas detection probe are installed in place in step S2 includes inserting the tail gas detection probe into the gas cylinder, detecting the concentration of ambient oxygen by the tail gas detection probe before inserting the tail gas detection probe into the gas cylinder, detecting the concentration of oxygen in the gas cylinder when the tail gas detection probe is inserted into the gas cylinder, comparing the concentration of ambient oxygen with the concentration of oxygen in the gas cylinder, and determining that the tail gas detection probe has been inserted into the gas cylinder when the concentration of oxygen in the gas cylinder is at least 0.2% lower than the concentration of ambient oxygen;
and then continuously installing the tail gas detection probe and the gas collecting cylinder on the tail gas pipe, inserting the tail gas detection probe into the tail gas pipe, detecting the concentration of oxygen in the tail gas pipe after the tail gas detection probe and the gas collecting cylinder are installed in place, and judging that the part where the tail gas detection probe is inserted is the tail gas pipe when the concentration of the oxygen in the tail gas pipe is lower than 5% of the concentration of ambient oxygen.
Further, in the step S5, when the upper computer system detects that the gas collecting cylinder falls off, the system gives an alarm.
Further, in the step S1, when the exhaust gas detection probe is inserted into the exhaust pipe, the exhaust gas detection probe detects the concentration of carbon dioxide in the exhaust pipe, and when the concentration of carbon dioxide in the exhaust pipe is higher than 3% of the concentration of carbon dioxide in the environment and the concentration of oxygen in the exhaust pipe is lower than 5% of the concentration of oxygen in the environment, it is determined that the exhaust gas detection probe has been inserted into the exhaust pipe, and after the exhaust gas detection probe is inserted into the exhaust pipe by more than 30cm, the exhaust gas detection probe and the gas collecting cylinder are fixed.
Further, the method for calculating the difference between the data of the attitude detection sensor and the data of the scale detected in real time in step S5 includes:
X=abs(Xat present-XScale with a measuring device)
Y=abs(YAt present-YScale with a measuring device)
Z=abs(ZAt present-ZScale with a measuring device)
Wherein, XAt presentDetecting the X-axis angular value, X, of the sensor for real-time detection of attitudeScale with a measuring deviceIs the X-axis angle value of the scale data, and X is the attitude detection sensor X-axis and mark detected in real timeAbsolute value of difference, Y, of X-axis of ruler dataAt presentDetecting the Y-axis angular value of the sensor for real-time detection of attitude, YScale with a measuring deviceIs the Y-axis angle value of the scale data, Y is the absolute value of the difference between the Y-axis of the attitude detection sensor and the Y-axis of the scale data detected in real time, ZAt presentSensing the Z-axis angular value of the sensor for real-time sensingScale with a measuring deviceThe Z-axis angle value of the scale data is obtained, and Z is the absolute value of the difference value between the Z axis of the attitude detection sensor and the Z axis of the scale data detected in real time;
and when both X, Y and Z are larger than the pipe dropping threshold value, judging that the gas collecting cylinder drops.
An automobile exhaust anti-cheating detection system based on a posture sensor comprises a posture detection sensor, a gas collecting cylinder, an exhaust detection probe, a signal conditioning unit and an upper computer system, wherein the posture detection sensor is arranged on the gas collecting cylinder and detects the posture information of the gas collecting cylinder; the attitude detection sensor is connected with the signal conditioning unit, the signal conditioning unit comprises a low-pass filtering module, an amplifying module and an amplifying and shaping module, the attitude detection sensor is connected with the low-pass filtering module, the low-pass filtering module is connected with the amplifying module, the amplifying module is connected with the amplifying and shaping module, the signal conditioning unit further comprises an A/D converter, the A/D converter is connected with the amplifying and shaping module, and the A/D converter receives analog quantity sent by the low-pass filtering module and the amplifying module and converts the analog quantity into digital quantity;
the signal conditioning unit also comprises a microprocessor, the microprocessor is connected with the A/D converter, the digital quantity converted by the A/D converter is transmitted to the microprocessor, the microprocessor transmits data to an upper computer system, the upper computer system carries out automatic calculation and comparison on the acquired attitude detection sensor data and generates an analysis report and alarms on abnormal data, wherein the attitude detection sensor acquires the attitude information of the gas collecting cylinder as scale data when a vehicle to be detected idles, the upper computer system carries out real-time detection on the attitude information of the gas collecting cylinder and compares the attitude information with the scale data when tail gas detection is carried out, the upper computer system judges whether the gas collecting cylinder deviates from a preset position according to the result of data comparison, wherein a supervisory person can set a threshold value in the upper computer system, and when tail gas detection is carried out, the result of comparison between the attitude information of the gas collecting cylinder detected by the attitude detection sensor in real time and the scale data exceeds the threshold value Judging whether the gas collecting cylinder deviates from a preset position when the value is obtained;
the gas collecting cylinder comprises a horn mouth mask at the front end and a straight cylinder at the rear end, the straight cylinder is connected with the horn mouth mask, a detection probe mounting pipe is arranged on the horn mouth mask and is communicated with the horn mouth mask, a fixing device is sleeved outside the detection probe mounting pipe, the tail gas detection probe is inserted into the gas collecting cylinder through the detection probe mounting pipe and is fixed through the fixing device, external threads are arranged outside the tail gas detection probe, a fixing and limiting device is connected to the tail gas detection probe through threads, and a buckle is arranged on the fixing and limiting device;
the straight cylinder on be provided with the ring channel, the ring channel in be provided with the fixed orifices, still include fixed casing, fixed casing inside be provided with the PCB board, the PCB board on be provided with gesture detection sensor, fixed casing on be provided with fixing bolt, fixing bolt's double-screw bolt one end sets up the outside at fixed casing, fixed casing on be provided with data interface, data interface and PCB board connection, fixed casing in both sides be provided with the draw-in groove, the both ends card of PCB board go into the draw-in groove internal fixation, one side of fixed casing be provided with the mounting panel, the mounting panel is fixed on fixed casing, the mounting panel on be provided with the mounting hole, data interface on be provided with flange, data interface arrange in the mounting hole, and through flange and mounting panel fixed connection, the fixing device is characterized in that the fixing shell is provided with an installation seat, the installation seat is I-shaped and is clamped on the bottom surface of the fixing shell, a threaded connection hole is formed in the installation seat, the fixing bolt is in threaded connection with the threaded connection hole, two binding belts are arranged on the installation seat, one end of one binding belt is provided with a binding head, the installation seat is a metal installation seat, the two binding belts are welded on the installation seat, the fixing bolt arranged on the fixing shell is arranged in the fixing hole formed in the annular groove and is locked through a nut, the two binding belts are bound on the annular groove, one binding belt penetrates through the binding head on the other binding belt to be fixed, and the straight cylinder is provided with a lifting handle;
the fixed limiting device comprises a connecting sleeve, a mounting hole is arranged in the connecting sleeve, the mounting hole is a stepped hole, a reset spring is arranged in the mounting hole, one end of the reset spring is abutted against the stepped hole of the mounting hole, a first thrust ball bearing is arranged in the mounting hole, one end of the first thrust ball bearing is abutted against the other end of the reset spring, a threaded sleeve is arranged in the mounting hole, a threaded hole is formed in the threaded sleeve, one end of the threaded sleeve is abutted against one end of the first thrust ball bearing, a mounting groove is formed in one end of the threaded sleeve, a second thrust ball bearing is arranged in the mounting groove, a plurality of clamping grooves are formed in the groove wall of the mounting groove in the axial direction, one end of the connecting sleeve is fixedly connected with an end cover through a bolt, and a plurality of clamping teeth are arranged on the end face, opposite to the connecting, the mounting groove is internally provided with a pressing plate, one end face of the pressing plate abuts against the second thrust ball bearing, the other end face of the pressing plate is provided with a plurality of pressing columns, the end cover is provided with a plurality of through holes, the pressing columns are arranged in the through holes, and the pressing columns extend out of the end face of the end cover when the reset spring is in an initial state.
The fixing device comprises a shell, the shell is of a hollow structure, a worm wheel is arranged in the shell, a torsion spring is arranged on one end face of the worm wheel, a clamping sleeve is arranged at the other end of the torsion spring, the clamping sleeve is rotatably arranged in the shell, the clamping sleeve is cylindrical, a plurality of clamping grooves are formed in the cylinder wall of the clamping sleeve, the clamping grooves are L-shaped, the buckles are also L-shaped and matched with the clamping grooves, the number of the buckles is the same as that of the clamping grooves, the end of the L-shaped short side of each buckle is arc-shaped, the arc transition is formed at the connection part of one end of each clamping groove and the end of the clamping sleeve, an unlocking mechanism is further arranged on the shell and comprises a lock cylinder, a worm is coaxially connected with the lock cylinder, the worm is meshed with the worm wheel, and the unlocking mechanism is arranged in the; still include fixed end cover, fixed end cover fixes the tip at the shell, the stiff end is covered and is provided with a plurality of patchholes, the patchhole corresponds with the joint groove, and patchhole and joint groove part dislocation set.
The invention has the following advantages:
1. according to the invention, the attitude detection sensor is arranged on the gas collecting cylinder, the attitude detection sensor can detect the change of the angle of the gas collecting cylinder when the position of the gas collecting cylinder changes, whether the gas collecting cylinder falls off can be judged through detecting the change of the angle, the state of the attitude detection sensor is obtained by the upper computer system every time when tail gas is detected, the attitude detection sensor is compared with the data of a scale, if both X, Y and Z do not exceed the threshold value, the detection is continued, the upper computer system alarms as long as both X, Y and Z are greater than the pipe-off threshold value, the gas collecting cylinder is judged to fall off, and the detection of the tail gas is stopped at the moment, so that the detection mode is adopted, the response speed is high, the response is carried out within 4 seconds, and the anti-;
2. the automobile exhaust anti-cheating detection system is provided with a fixed limiting device, the fixed limiting device is arranged on a gas collecting cylinder and then presses a pressing column into a through hole, a reset spring is compressed at the moment, a clamping tooth arranged on an end cover and a clamping groove arranged on the groove wall of an installation groove of a threaded sleeve are changed into a separated state from a meshed state, at the moment, if the exhaust detection probe is rotated, the exhaust detection probe drives the threaded sleeve to rotate together, the threaded sleeve idles in the installation hole, cheating cannot be performed by rotating the exhaust detection probe, the anti-cheating effect is achieved, after the fixed limiting device is taken down, the pressing column loses extrusion force, at the moment, the clamping groove on the threaded sleeve is pushed to be meshed with the clamping tooth on an end cover under the action of the reset spring, so that the fixed limiting device can move along the exhaust detection probe by rotating a connecting sleeve after the fixed limiting device is separated from the gas collecting cylinder, the problem of cheating is well solved.
Drawings
FIG. 1 is a flowchart illustrating the determination of an anti-cheating method according to the present invention;
FIG. 2 is a schematic view of a structure of a matching relationship between a gas collecting cylinder and a tail gas detection probe of the anti-cheating detection system of the present invention;
FIG. 3 is a schematic view of the gas cylinder structure of the anti-cheating detection system of the present invention;
FIG. 4 is a schematic diagram of a side view of the gas cylinder of the anti-cheating detection system of the present invention;
FIG. 5 is a schematic view of an attitude detection sensor mounting structure of the anti-cheating detection system of the present invention;
FIG. 6 is a schematic structural view of a fixing and limiting device of the anti-cheating detection system of the present invention;
FIG. 7 is a schematic view of a threaded sleeve configuration of the anti-cheating detection system of the present invention;
FIG. 8 is a schematic view of an end cap configuration of the anti-cheating detection system of the present invention;
FIG. 9 is an enlarged view of the structure at A in FIG. 3;
FIG. 10 is a schematic view of a fixture of the anti-cheating detection system of the present invention;
FIG. 11 is a schematic view of the unlocking mechanism of the anti-cheating detection system of the present invention;
FIG. 12 is a schematic diagram of a ferrule configuration of the anti-cheating detection system of the present invention;
FIG. 13 is a schematic view of a fixed end cap configuration of the anti-cheating detection system of the present invention;
FIG. 14 is a schematic view of a snap-in configuration of the anti-cheating detection system of the present invention;
in the figure: 1-straight cylinder, 2-horn mask, 3-detection probe installation tube, 4-fixing device, 41-shell, 42-worm wheel, 43-torsion spring, 44-cutting sleeve, 441-clamping groove, 45-fixing end cover, 451-insertion hole, 46-worm, 47-lock core, 5-tail gas detection probe, 6-fixing limiting device, 7-handle, 8-fixing shell, 9-attitude detection sensor, 10-PCB board, 11-ribbon, 12-fixing bolt, 13-data interface, 14-fixing hole, 15-annular groove, 16-connecting flange, 17-connecting sleeve, 18-thread sleeve, 181-thread hole, 182-installation groove, 183-clamping groove, 19-reset spring, 20-a first thrust ball bearing, 21-a second thrust ball bearing, 22-a pressing plate, 23-an end cover, 231-a clamping tooth, 232-a through hole, 24-a mounting plate, 25-a pressing column, 26-a mounting seat and 27-a buckle.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that 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 like elements in a process, method, article, or apparatus that comprises the element.
The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following.
As shown in fig. 1, a method for detecting cheating in automobile exhaust based on attitude sensor comprises the following steps:
s1, mounting a gas cylinder for detecting tail gas on a tail gas pipe of an automobile, wherein the gas cylinder is provided with a tail gas detection probe 5, the tail gas detection probe 5 is arranged in the tail gas pipe of the automobile, and the gas cylinder is provided with a posture detection sensor 9;
s2, when the gas collecting cylinder and the tail gas detection probe 5 are installed on the tail gas pipe, the tail gas detection probe 5 detects the concentration of oxygen in real time and transmits the detected data to the upper computer system, and the upper computer system judges whether the gas collecting cylinder and the tail gas detection probe 5 are installed in place or not according to the concentration of the oxygen;
s21, acquiring data of the scale by the attitude detection sensor 9 after the automobile idles for 40-50 seconds, detecting the concentration of a compound in the tail gas pipe of the automobile by the tail gas detection probe 5 when the automobile idles, and detecting NO in the compound by the tail gas detection probe 5XHas a concentration of 0 to 50ppm and CO2Has a concentration of 6-9% and O2When the concentration of the water is 0.8-1.5%, the concentration of CO is 3-10% and the concentration of THC is 300-8000 ppm, the upper computer system judges that the automobile starts to idle, and at the moment, the upper computer system starts to time and acquires data of the scale after timing for 40-50 seconds;
s3, acquiring attitude data of the current attitude detection sensor 9 as a scale and storing the data after the upper computer system detects that the gas collecting cylinder and the tail gas detection probe 5 are installed in place, wherein the attitude data of the attitude detection sensor 9 comprises an X-axis angle, a Y-axis angle and a Z-axis angle;
s4, starting detection by an upper computer system, detecting the tail gas in the tail gas pipe by the tail gas detection probe 5, and transmitting the detected data to the upper computer for storage;
s5, detecting the attitude data of the attitude detection sensor 9 in real time by the upper computer system while detecting the tail gas, comparing the detected data with the data of the scale to judge whether the gas collecting cylinder falls off, setting a pipe-dropping threshold value by the upper computer system, judging that the gas collecting cylinder falls off when the absolute values of the difference values of the X-axis angle, the Y-axis angle and the Z-axis angle of the attitude detection sensor 9 detected in real time and the X-axis angle, the Y-axis angle and the Z-axis angle corresponding to the data of the scale exceed the pipe-dropping threshold value, and detecting the change of the acceleration simultaneously to comprehensively judge the change of the angle. In the scheme, the gas collecting cylinder is provided with the attitude detection sensor 9, the attitude detection sensor 9 is fixed on the gas collecting cylinder through bolts and is fixed at a measuring probe handle of the tail gas detection probe 5 through a hoop, the attitude detection sensor 9 can be ensured to be stably fixed on the tail gas detection probe 5 or the gas collecting cylinder, the attitude detection sensor 9 can detect the change of the angle of the gas collecting cylinder when the position of the gas collecting cylinder changes, whether the gas collecting cylinder falls off or not can be judged through detecting the change of the angle, usually, the natural falling off of the gas collecting cylinder under the shaking of a vehicle is an event with small probability, the change of the angle when the gas collecting cylinder is moved artificially can be detected in time through the detection mode, most of tail gas detection cheats are that the detection is not normally carried out through moving the gas collecting cylinder out of the tail gas pipe, thus, the detected data can reach the detection standard, the gas collecting cylinder can be moved when cheating occurs, and the attitude detection sensor, the gesture detection sensor 9 is adopted to detect response fast, the alarm can be given in time after abnormity is detected, the existing detection method adopts the camera to monitor, dead angles exist in the monitoring of the camera, the visual field can be lost under artificial shielding, the picture of the camera cannot be stared at all times, more video backup during detection is used as traceability, the traceability is convenient, the environment is enhanced along with the national emphasis, the control on the automobile exhaust emission is also enhanced, so that the cheating is also zero-tolerance through the detection mode, the occurrence of cheating events can be detected in time, and good help is provided for the detection and cheating prevention of the automobile exhaust.
The gas collecting cylinder and the tail gas detection probe 5 in the scheme both adopt the existing structures, when the attitude detection sensor 9 is arranged on the gas collecting cylinder, the gas collecting cylinder and the tail gas detection probe 5 are required to be fixed together, so that the tail gas detection probe 5 cannot be moved out of the gas collecting cylinder by a person, cheating cannot be done by the person in a mode of pulling out the tail gas detection probe 5 but not moving out of the gas collecting cylinder, the gas collecting cylinder can be driven to move together when the tail gas detection probe 5 is pulled, and the gas collecting cylinder can detect the change of the attitude by moving the attitude detection sensor 9, so as to give an alarm; the attitude detection sensor 9 is arranged at the handle of the measuring probe of the tail gas detection probe 5, so that the attitude detection sensor 9 of the movable gas collecting cylinder can detect the change of the attitude and then give an alarm, and therefore the man-made cheating can be prevented.
And S51, the upper computer system is provided with a display module, and the display module displays oscillograms of posture changes of the X-axis angle, the Y-axis angle and the Z-axis angle in real time. In order to visually see the position conditions of the gas collecting cylinder and the tail gas detection probe 5, the posture changes of the X-axis angle, the Y-axis angle and the Z-axis angle are displayed on the display module in a wave form pattern mode, so that a worker can visually see the position change conditions of the gas collecting cylinder and the tail gas detection probe 5, and changed data can be used as backup data to facilitate later-stage tracing.
The attitude detection sensor 9 collects data of the scale after the automobile idles for 40-50 seconds. The initial idling process of adopting simple and easy transient state operating mode method test in this scheme. When the automobile idles, the tail gas pipe of the automobile discharges tail gas, the upper computer system judges that the automobile starts idling when the tail gas detection probe 5 detects that the concentration of NOX in the compound is 0-50 ppm, the concentration of CO2 is 6-9%, the concentration of O2 is 0.8-1.5%, the concentration of CO is 3-10%, and the concentration of THC is 300-8000 ppm, and at the moment, the upper computer system judges that the automobile is idling and times, and the detection can be carried out after idling is carried out for 40-50 seconds.
Specifically, the pipe dropping threshold value in the step S5 is 5-7 degrees, and the pipe dropping threshold value can be changed in an upper computer system to adapt to the detection environment. If the vibration of the automobile tail gas pipe is small when a gasoline automobile type is detected, the pipe dropping threshold value can be set to be 5 degrees, and the vibration of the automobile tail gas pipe is large when a diesel automobile type is detected, at the moment, if the pipe dropping threshold value is 5 degrees as the same as the pipe dropping threshold value of the gasoline automobile type, the situation of misjudgment can be caused, so that different threshold values can be selected according to different automobile types, and the adaptability of the detection system is enhanced.
Specifically, in the step S5, after the upper computer system judges that the gas cylinder falls off, the upper computer system resets, and then the steps S1 to S5 are repeated to perform detection again.
Specifically, the method for determining whether the gas cylinder and the tail gas detection probe 5 are installed in place in step S2 includes inserting the tail gas detection probe 5 into the gas cylinder, detecting the concentration of ambient oxygen by the tail gas detection probe 5 before inserting into the gas cylinder, detecting the concentration of oxygen in the gas cylinder when the tail gas detection probe 5 is inserted into the gas cylinder, comparing the concentration of ambient oxygen with the concentration of oxygen in the gas cylinder, and determining that the tail gas detection probe 5 is inserted into the gas cylinder when the concentration of oxygen in the gas cylinder is at least 0.2% lower than the concentration of ambient oxygen;
and then continuously installing the tail gas detection probe 5 and the gas collecting cylinder on the tail gas pipe, inserting the tail gas detection probe 5 into the tail gas pipe, detecting the concentration of oxygen in the tail gas pipe after the tail gas detection probe 5 and the gas collecting cylinder are installed in place, and judging that the inserted part of the tail gas detection probe 5 is the tail gas pipe when the concentration of the oxygen in the tail gas pipe is lower than 5% of the concentration of ambient oxygen. In the scheme, when the tail gas detection probe 5 is installed, the tail gas detection probe is firstly inserted into the gas collecting cylinder, at the moment, the upper computer system needs to judge whether the tail gas detection probe 5 is inserted into the gas collecting cylinder, the judgment method is that the oxygen concentration of the detection environment is compared with the oxygen concentration in the gas collecting cylinder when the tail gas detection probe 5 is inserted into the gas collecting cylinder, the oxygen concentration in the gas collecting cylinder is certainly lower than the oxygen concentration of the environment and is lower than 0.2% but not higher than 0.5%, so that if the detected concentration difference is within 0.2% or higher than 0.5%, the upper computer system can judge that the tail gas detection probe 5 is not inserted into the gas collecting cylinder, and at the moment, the upper computer system can give a prompt to reinsert, the operation mode can avoid cheating to insert the tail gas detection probe 5 into other places, further, the prompt to continue to be inserted into the tail gas collecting cylinder after the tail gas detection, at the moment, the tail gas detection probe 5 and the gas collecting cylinder are arranged on the tail gas pipe, and the tail gas detection probe 5 continues to detect the oxygen concentration and the carbon dioxide concentration in the tail gas pipe and the concentration of other tail gas components; under normal conditions, the concentration of oxygen in the tail gas pipe is obviously lower than that of oxygen in the environment, and the concentration of carbon dioxide and other tail gas compounds in the tail gas pipe is obviously higher than that of carbon dioxide in the environment, so when the concentration of oxygen is detected to be lower than that of oxygen in the environment, and the concentration of carbon dioxide and other tail gas components are obviously higher than that of carbon dioxide in the environment, the tail gas detection probe 5 is judged to be inserted into the tail gas pipe, only the gas collecting cylinder is required to be fixed on the tail gas pipe, and the tail gas detection probe 5 is inserted into the tail gas pipe by more than 30cm, the tail gas detection probe 5 and the gas collecting cylinder are installed in such a way, the cheat of inserting the tail gas detection probe 5 into other places is prevented, so that the cheat prevention is started before the data detection of the tail gas is started, and the occurrence of the cheat condition can be further reduced, the reliability of the system is improved.
The upper computer system can prompt operation when in use, and prompt installation according to the installation sequence of the tail gas detection probe 5 and the gas collecting cylinder when in detection, and the installation at each time needs to be confirmed, and prompts the next installation after the installation is confirmed to be in place.
Specifically, in step S5, when the upper computer system detects that the gas collecting cylinder falls off, the system gives an alarm, and the alarm can prompt the staff to perform corresponding processing in time.
Specifically, in step S1, when the exhaust gas detecting probe 5 is inserted into the exhaust pipe, the exhaust gas detecting probe 5 detects the concentration of carbon dioxide in the exhaust pipe, and when the concentration of carbon dioxide in the exhaust pipe is higher than 3% of the environmental carbon dioxide concentration and the concentration of oxygen in the exhaust pipe is lower than 5% of the environmental oxygen concentration, it is determined that the exhaust gas detecting probe 5 has been inserted into the exhaust pipe, and after the exhaust gas detecting probe 5 is inserted into the exhaust pipe by more than 30cm, the exhaust gas detecting probe 5 and the gas collecting cylinder are fixed.
Specifically, the method for calculating the difference between the data of the attitude detection sensor 9 and the data of the scale detected in real time in step S5 is:
X=abs(Xat present-XScale with a measuring device)
Y=abs(YAt present-YScale with a measuring device)
Z=abs(ZAt present-ZScale with a measuring device)
Wherein, XAt presentDetecting the X-axis angular value, X, of the sensor 9 for real-time detection of the attitudeScale with a measuring deviceIs the X-axis angle value of the scale data, X is the absolute value of the difference between the X-axis of the attitude detection sensor 9 and the X-axis of the scale data detected in real time, YAt presentDetecting the value of the Y-axis angle of the sensor 9 for real-time detection, YScale with a measuring deviceIs the Y-axis angle value of the scale data, Y is the absolute value of the difference between the Y-axis of the attitude detection sensor 9 and the Y-axis of the scale data detected in real time, ZAt presentDetecting the Z-axis angular value, Z, of the sensor 9 for real-time detection of attitudeScale with a measuring deviceThe Z-axis angle value of the scale data is obtained, and Z is the absolute value of the difference value between the Z axis of the attitude detection sensor 9 and the Z axis of the scale data detected in real time;
the state of the attitude detection sensor 9 is obtained every time when the upper computer system detects tail gas, the state is compared with data of the scale, if both X, Y and Z do not exceed a threshold value, detection is continued, the upper computer system alarms as long as both X, Y and Z are greater than 5 degrees, the gas collecting cylinder is judged to fall off, the detection of the tail gas is stopped at the moment, the upper computer system prompts the gas collecting cylinder to fall off, the gas collecting cylinder is required to be installed again, then the system is reset, and detection is restarted from the initial idling process.
Further, the data of the scale is acquired in step S2 by continuously acquiring data of three sets of posture detecting sensors 9 and then taking an average value as the scale data. When the data of the scale is collected, the automobile is in an idling state, at the moment, the tail gas pipe is in a shaking state, the situation that the data is unreal exists when a group of data of the attitude detection sensor 9 at the idling state is taken as the scale data at will, the automobile basically shakes frequently at the idling state, the shaking is periodic and has stable amplitude, the data at the vibration wave crest or the wave trough can be collected when only a group of data is collected as comparison data, and serious errors can be generated for subsequent judgment by adopting the data as the data of the scale, so the scheme aims to eliminate the errors caused by the scale data to the judgment, continuously collects the data of the attitude detection sensor 9 for three times, the data can be collected at the same time interval for three times, for example, the data is collected at 1 second interval, then the average value is taken as the scale data, and the data of the three groups of data after the average value is taken is closer to the, the data of the scale is more referential, and the system adopting the data of the scale has higher detection accuracy.
As shown in fig. 2 to 14, an automobile exhaust anti-cheating detection system based on an attitude sensor comprises an attitude detection sensor 9, a gas cylinder, an exhaust detection probe 5, a signal conditioning unit and an upper computer system, wherein the attitude detection sensor 9 is arranged on the gas cylinder, the attitude detection sensor 9 detects attitude information of the gas cylinder, and detects the attitude information of the gas cylinder when exhaust detection is performed, and whether the gas cylinder abnormally moves is judged by comparing the detected attitude information with scale data; the attitude detection sensor 9 is connected with the signal conditioning unit, the signal conditioning unit comprises a low-pass filtering module, an amplifying module and an amplifying and shaping module, the attitude detection sensor 9 is connected with the low-pass filtering module, the low-pass filtering module is connected with the amplifying module, the amplifying module is connected with the amplifying and shaping module, the signal conditioning unit further comprises an A/D converter, the A/D converter is connected with the amplifying and shaping module, and the A/D converter receives analog quantity sent by the low-pass filtering module and the amplifying module and converts the analog quantity into digital quantity;
the signal conditioning unit further comprises a microprocessor, the microprocessor is connected with the A/D converter, digital quantity converted by the A/D converter is transmitted to the microprocessor, the microprocessor transmits data to an upper computer system, the upper computer system carries out automatic calculation and comparison on the acquired data of the attitude detection sensor 9 and generates an analysis report and alarms on abnormal data, wherein the attitude detection sensor 9 acquires attitude information of the gas collecting cylinder as scale data when a vehicle to be detected idles, the upper computer system carries out real-time detection on the attitude information of the gas collecting cylinder and comparison on the scale data when tail gas detection is carried out, and the upper computer system judges whether the gas collecting cylinder deviates from a preset position according to the result of data comparison, wherein a supervisory person can set a threshold value in the upper computer system, and when tail gas detection is carried out, the attitude detection sensor 9 detects the junction of the attitude information of the gas collecting cylinder and the scale data in real time If the result exceeds the threshold value, judging that the gas collecting cylinder deviates from the preset position;
the gas collecting cylinder comprises a horn mask 2 at the front end and a straight cylinder 1 at the rear end, the straight cylinder 1 is connected with the horn mask 2, a detection probe installation pipe 3 is arranged on the horn mask 2, the detection probe installation pipe 3 is communicated with the horn mask 2, a fixing device 4 is sleeved outside the detection probe installation pipe 3, the tail gas detection probe 5 is inserted into the gas collecting cylinder through the detection probe installation pipe 3 and then is fixed through the fixing device 4, external threads are arranged outside the tail gas detection probe 5, a fixing and limiting device 6 is connected to the tail gas detection probe 5 through threads, and a buckle 27 is arranged on the fixing and limiting device 6; the front end of the gas collecting cylinder is horn-shaped, the rear end of the gas collecting cylinder is cylindrical, the front end of the gas collecting cylinder is sleeved on a tail gas pipe of an automobile when in use, the cylindrical part of the rear end is connected with an exhaust pipe, a mounting hole is formed in the horn-shaped part of the gas collecting cylinder, a tail gas detection probe 5 extends into the gas collecting cylinder from the mounting hole, and the attitude detection sensor 9 can be mounted at the junction of the horn-shaped part and the cylindrical part of the gas collecting cylinder, so that the fixation is convenient; when detecting tail gas, someone moves the gas cylinder or tail gas test probe 5 and cheats to reach the condition that tail gas detection reaches standard, in order to prevent the production of this kind of condition, this scheme sets up gesture detection sensor 9 on the gas cylinder, detect the gesture condition of gas cylinder in real time through gesture detection sensor 9, the system that detects will report to the police when the gesture of gas cylinder is the X axle, Y axle and Z axle and exceeds the threshold value of settlement, at this moment, indicate that the gas cylinder of installing on the car tail gas pipe has broken away from the position, at this moment just need install again and detect, just so can prevent the emergence that the gas cylinder was cheated to the artificial removal.
The automobile exhaust gas purifier is characterized in that an annular groove 15 is formed in the straight cylinder 1, a fixing hole 14 is formed in the annular groove 15, the straight cylinder 1 is made of metal materials, the straight cylinder 1 is connected to an air guide pipe when the automobile exhaust gas purifier is used, the air guide pipe guides tail gas exhausted by an automobile into other places, the automobile exhaust gas purifier further comprises a fixing shell 8, a PCB 10 is arranged inside the fixing shell 8, a posture detection sensor 9 is arranged on the PCB 10, a fixing bolt 12 is arranged on the fixing shell 8, one end of a stud of the fixing bolt 12 is arranged outside the fixing shell 8, a data interface 13 is arranged on the fixing shell 8, the data interface 13 is connected with the PCB 10, clamping grooves are formed in two sides in the fixing shell 8, two ends of the PCB 10 are clamped into the clamping grooves and fixed in the clamping grooves, a mounting plate 24 is arranged on one side of the fixing shell 8, the mounting plate 24, the mounting panel 24 on be provided with the mounting hole, data interface 13 on be provided with flange 16, data interface 13 arrange in the mounting hole, and through flange 16 and mounting panel 24 fixed connection, fixed shell 8 on be provided with mount pad 26, mount pad 26 be "worker" type, its joint is on the bottom surface of fixed shell 8, mount pad 26 on be provided with the screw connection hole, fixing bolt 12 and screw connection hole threaded connection, mount pad 26 on be provided with two ribbons 11, the one end of one of them ribbon 11 is provided with the ribbon head, mount pad 26 be the metal mount pad, two ribbons 11 all weld in mount pad 26, fixing bolt 12 that sets up on fixed shell 8 arrange in the fixed orifices 14 that sets up in the ring channel 15 and through nut locking, two binding tapes 11 are bound on the annular groove 15, one binding tape 11 penetrates through a binding tape head on the other binding tape 11 to be fixed, and a lifting handle 7 is arranged on the straight cylinder 1; the attitude detection sensor 9 in the scheme is used for detecting the attitude data of a gas collecting cylinder arranged on an automobile tail gas pipe during automobile inspection of automobile tail gas, the gas collecting cylinder is manually pulled or a probe for detection is used for cheating to ensure that the tail gas detection is qualified during the automobile inspection of the automobile tail gas, the attitude detection sensor 9 can detect the attitude data of the gas collecting cylinder during the automobile tail gas detection after being arranged on the gas collecting cylinder, wherein the attitude detection sensor 9 detects the angle data and the acceleration data of the X axis, the Y axis and the Z axis of the gas collecting cylinder, the automobile can idle for 40 seconds before the detection is started, at the moment, the attitude detection sensor 9 is required to detect the attitude data of the current gas collecting cylinder as scale data, then the attitude detection sensor 9 detects the attitude data of the gas collecting cylinder in real time during the tail gas detection and compares the attitude data with the scale data, and a system alarms when the absolute value of the difference value of the data of the attitude detection sensor 9 data and, at this moment, the gas collecting cylinder is separated from the original position, the gas collecting cylinder needs to be detected again under the condition, the attitude detection sensor 9 and the PCB 10 are arranged in the fixed shell 8, the attitude detection sensor 9 can adopt an attitude angle sensor with the model number of JY60, a detection circuit matched with the attitude detection sensor 9 is printed on the PCB 10, and data detected by the attitude detection sensor 9 are finally transmitted to an upper computer system through the data interface 13 for processing. In the scheme, the installation seat 26 is arranged on the fixed shell 8, the main purpose of the installation seat 26 is to be used for connecting the binding belt 11, if the fixed shell 8 is only fixed by the fixing bolt 12, the tail gas pipe can vibrate during vehicle inspection, the nut can loosen after long-time use, and the shaking can drive the fixed shell 8 to rotate, so that the posture detection sensor 9 can have detection errors, after the binding belt 11 is arranged on the installation seat 26, the fixed shell 8 is placed in the fixing hole 14 through the fixing bolt 12 and is fixed on the gas collecting cylinder through the nut, and then the binding belt 11 is bound in the annular groove 15 on the gas collecting cylinder, even if the nut loosens, the rotation of the fixed shell 8 can be limited through the binding belt 11, and similarly, if only the binding belt 11 is used for binding, the binding belt can rotate along the circumferential direction of the gas collecting cylinder under shaking, the detection errors can also be caused, therefore, the problem that the position of the fixed shell 8 on the gas collecting cylinder is limited by the fixing bolt 12 can be solved well, and the fixed shell 8 can be fixed at the fixed position and prevented from rotating in a fixing mode by matching and fixing the binding belt 11 and the fixing bolt 12, so that the using effect is better;
the fixed limiting device 6 comprises a connecting sleeve 17, a mounting hole is arranged in the connecting sleeve 17 and is a stepped hole, a reset spring 19 is arranged in the mounting hole, one end of the reset spring 19 abuts against the stepped hole of the mounting hole, a first thrust ball bearing 20 is arranged in the mounting hole, one end of the first thrust ball bearing 20 abuts against the other end of the reset spring 19, a threaded sleeve 18 is arranged in the mounting hole, a threaded hole 181 is arranged on the threaded sleeve 18, one end of the threaded sleeve 18 abuts against one end of the first thrust ball bearing 20, a mounting groove 182 is arranged at one end of the threaded sleeve 18, a second thrust ball bearing 21 is arranged in the mounting groove 182, a plurality of clamping grooves 183 arranged along the axial direction are formed in the groove wall of the mounting groove 182, and one end of the connecting sleeve 17 is fixedly connected with an end cover 23 through a bolt, the end cover 23 is provided with a plurality of latch 231 with circumference array on the relative terminal surface of adapter sleeve 17, still be provided with clamp plate 22 in the mounting groove 182, a terminal surface butt of clamp plate 22 is in on the second thrust ball bearing 21, be provided with a plurality of compression legs 25 on the other terminal surface of clamp plate 22, the end cover 23 on be provided with a plurality of through-holes 232, the compression leg 25 is arranged in the through-hole 232, the compression leg 25 extends the terminal surface of end cover 23 during reset spring 19 initial condition. The vehicle inspection method has the advantages that the vehicle inspection method is wide in vehicle types, exhaust pipes of a plurality of vehicle types are different in structure, the length of the tail gas detection probe 5 extending into the tail gas pipe needs to be adjusted sometimes, so that the tail gas detection probe 5 and a gas collecting cylinder are in a detachable connection mode rather than a fixed connection mode, cheating can be achieved by pulling the tail gas detection probe 5 during tail gas detection in the connection mode, in order to solve the problem of cheating by manually pulling the tail gas detection probe 5, external threads are arranged on the outer portion of the tail gas detection probe 5, the tail gas detection probe 5 is in threaded connection with a fixed limiting device 6 to limit the length of the tail gas detection probe 5 extending into the tail gas pipe, when the vehicle inspection method is used, the fixed limiting device 6 is rotated to enable the fixed limiting device 6 to move along the tail gas detection probe 5, and at the moment, the distance between the end portion of the tail gas, at this time, the fixed limiting device 6 is fixed on the gas collecting cylinder, so that the tail gas detection probe 5 can be limited from extending into the tail gas pipe, wherein the tail gas detection probe 5 and the fixed limiting device 6 are adjusted in position in a threaded connection mode, cheaters can change the position of the tail gas detection probe 5 extending into the gas collecting cylinder by rotating the tail gas detection probe 5, in order to solve the problem, the cheating is prevented by rotating the tail gas detection probe 5, in the scheme, a threaded sleeve 18 is arranged in a connecting sleeve 17, the threaded sleeve 18 is in threaded connection with the tail gas detection probe 5, a return spring 19 and a first thrust ball bearing 20 are further arranged in the connecting sleeve 17, after the fixed limiting device 6 is installed on the gas collecting cylinder, the end face of the fixed limiting device 6 is pressed on the gas collecting cylinder, at the moment, a pressure column 25 is pressed into a through hole 232, the pressure column 25 pushes a pressure plate 22, the pressure plate 22 pushes a second thrust ball bearing 21 and the threaded sleeve, at this time, the return spring 19 is compressed, and the latch 231 arranged on the end cover 23 and the slot 183 arranged on the slot wall of the mounting slot 182 of the threaded sleeve 18 are changed from a meshed state to a separated state, the threaded sleeve 18 can be rotatably arranged in the mounting hole of the connecting sleeve 17, at this time, if the tail gas detection probe 5 is rotated, the tail gas detection probe 5 can drive the threaded sleeve 18 to rotate together, and the threaded sleeve 18 can idle in the mounting hole, because the two ends of the threaded sleeve 18 are respectively provided with the second thrust ball bearing 21 and the first thrust ball bearing 20, the friction between the threaded sleeve 18 and the connecting sleeve 17 is reduced, so that the idle rotation is easier, cheating cannot be carried out by rotating the tail gas detection probe 5, the cheating prevention effect is achieved, after the fixed limiting device 6 is taken down, the compression column 25 loses the extrusion force, at this time, under the action of the return spring 19, the latch 183 on the threaded sleeve 18 is pushed to be meshed with the latch 231 on the end cover, rotate the adapter sleeve 17 after fixed stop device 6 separates with the gas collecting cylinder like this and just enable fixed stop device 6 to remove along tail gas test probe 5, such structure has prevented to rotate the condition emergence that tail gas test probe 5 cheated, has fine solved the problem of cheating, for make draw-in groove 183 and latch 231 can the rapid meshing, can set up latch 231 into wedge structure, draw-in groove 183 is located wedge latch 231 matched with structure. Also need adjust tail gas test probe 5's position when the tail gas pipe of the vehicle of car inspection damages the gas leakage, gas in the air can make the concentration of the intraductal tail gas of tail gas change after getting into the tail gas pipe otherwise, inserts the tail gas pipe before the idle speed this moment and probably causes the system to judge the condition that does not insert the tail gas pipe, just can adjust tail gas test probe 5 and insert the tracheal degree of depth of tail gas after same vehicle takes place such condition many times and reach that the system normally judges that tail gas test probe 5 inserts the tail gas pipe.
Further, the fixing device 4 includes a housing 41, the housing 41 is hollow, a worm wheel 42 is disposed in the housing 41, a torsion spring 43 is disposed on an end surface of the worm wheel 42, a sleeve 44 is disposed at the other end of the torsion spring 43, the sleeve 44 is rotatably disposed in the housing 41, the sleeve 44 is cylindrical, a plurality of clamping grooves 441 are disposed on a wall of the sleeve, the clamping grooves 441 are L-shaped, the clips 27 are also L-shaped and are adapted to the clamping grooves 441, the number of the clips 27 is the same as the number of the clamping grooves 441, an end of an L-shaped short side of the clips 27 is arc-shaped, an arc transition is disposed at a connection between one end of the clamping grooves 441 and an end of the sleeve 44, the housing 41 is further provided with an unlocking mechanism, the unlocking mechanism includes a lock cylinder 47, the lock cylinder 47 is coaxially connected with a worm 46, the worm 46 is engaged with the worm wheel 42, the unlocking mechanism is arranged in the shell 41; the fixing end cover 45 is further included, the fixing end cover 45 is fixed at the end portion of the shell 41, a plurality of insertion holes 451 are formed in the fixing end cover 45, the insertion holes 451 correspond to the clamping grooves 441, and the insertion holes 451 and the clamping grooves 441 are partially arranged in a staggered mode. In the scheme, the fixing and limiting device 6 inserts the buckle 27 into the insertion hole 451 of the fixing end cover 45 when fixing, because the insertion hole 451 and the clamping groove 441 are arranged in a staggered manner, namely one side of the clamping groove 441 is positioned in the middle of the insertion hole 451, when the buckle 27 is continuously inserted into the clamping groove 441, the clamping sleeve 44 is forced to rotate by a certain angle to enable the buckle 27 to be completely inserted into the clamping groove 441, at this time, the buckle 27 is continuously inserted until the short side of the buckle 27 is clamped into the short groove side of the clamping groove 441, when the buckle 27 is inserted to the bottom, the clamping sleeve 44 can be rotated to the original position under the action of the torsion spring 43, so that the clamping groove 441 is clamped with the buckle 27, the buckle 27 is fixed on the clamping sleeve 44, the pressing column 25 is pressed into the through hole 232 after the buckle 27 is fixed, when the fixing and limiting device 6 needs to be taken down, a key is inserted into the lock, worm 46 rotates and drives worm wheel 42 and rotate, worm wheel 42 rotates and makes cutting ferrule 44 rotate under the drive of torsional spring 43, cutting ferrule 44 rotates and makes joint groove 441 and buckle 27 break away from, pops out compression leg 25 under the restoring force effect of reset spring 19 like this, just so makes buckle 27 deviate from joint groove 441 a lesson, just so can easily with fixed stop device 6 and fixing device 4 separation, only the staff can adopt the key to open fixing device 4, improved the function of preventing cheating.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Those skilled in the art can make numerous possible variations and modifications to the described embodiments, or modify equivalent embodiments, without departing from the scope of the invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technology of the present invention are within the protection scope of the present invention, unless the content of the technical solution of the present invention is departed from.
Claims (9)
1. The utility model provides an automobile exhaust prevents detection system that cheats based on attitude sensor which characterized in that: the tail gas detection device comprises a posture detection sensor (9), a gas cylinder, a tail gas detection probe (5), a signal conditioning unit and an upper computer system, wherein the posture detection sensor (9) is arranged on the gas cylinder, the posture detection sensor (9) detects the posture information of the gas cylinder, the posture information of the gas cylinder is detected during tail gas detection, and whether the gas cylinder abnormally moves or not is judged according to the comparison between the detected posture information and scale data; the attitude detection sensor (9) is connected with the signal conditioning unit, the signal conditioning unit comprises a low-pass filtering module, an amplifying module and an amplifying and shaping module, the attitude detection sensor (9) is connected with the low-pass filtering module, the low-pass filtering module is connected with the amplifying module, the amplifying module is connected with the amplifying and shaping module, the signal conditioning unit further comprises an A/D converter, the A/D converter is connected with the amplifying and shaping module, and the A/D converter receives analog quantity sent by the low-pass filtering module and the amplifying module and converts the analog quantity into digital quantity;
the signal conditioning unit also comprises a microprocessor, the microprocessor is connected with an A/D converter, digital quantity converted by the A/D converter is transmitted to the microprocessor, the microprocessor transmits data to an upper computer system, the upper computer system carries out automatic calculation and comparison on the acquired data of the attitude detection sensor (9), and generates an analysis report and gives an alarm on abnormal data, wherein the attitude detection sensor (9) acquires attitude information of the gas collecting cylinder as scale data when a vehicle to be detected idles, the upper computer system carries out real-time detection on the attitude information of the gas collecting cylinder by the attitude detection sensor (9) during tail gas detection and compares the attitude information with the scale data, the upper computer system judges whether the gas collecting cylinder deviates from a preset position according to the result of the data comparison, wherein, a supervisory person can set a threshold value in the upper computer system, when tail gas is detected, the attitude detection sensor (9) detects that the attitude information of the gas collecting cylinder is compared with the scale data in real time, and when the result exceeds a threshold value, the gas collecting cylinder is judged to deviate from a preset position;
the gas collecting cylinder comprises a horn mask (2) at the front end and a straight cylinder (1) at the rear end, the straight cylinder (1) is connected with the horn mask (2), a detection probe installation pipe (3) is arranged on the horn mask (2), the detection probe installation pipe (3) is communicated with the horn mask (2), a fixing device (4) is sleeved outside the detection probe installation pipe (3), the tail gas detection probe (5) is inserted into the gas collecting cylinder through the detection probe installation pipe (3) and then fixed through the fixing device (4), external threads are arranged outside the tail gas detection probe (5), a fixing and limiting device (6) is in threaded connection with the tail gas detection probe (5), and a buckle (27) is arranged on the fixing and limiting device (6);
the straight section of thick bamboo (1) on be provided with ring channel (15), ring channel (15) in be provided with fixed orifices (14), still include fixed shell (8), fixed shell (8) inside be provided with PCB board (10), PCB board (10) on be provided with gesture detection sensor (9), fixed shell (8) on be provided with fixing bolt (12), the double-screw bolt one end of fixing bolt (12) sets up in the outside of fixed shell (8), fixed shell (8) on be provided with data interface (13), data interface (13) are connected with PCB board (10), both sides in fixed shell (8) be provided with the draw-in groove, the both ends card of PCB board (10) go into the draw-in groove internal fixation, one side of fixed shell (8) be provided with mounting panel (24), mounting panel (24) are fixed on fixed shell (8), mounting panel (24) on be provided with the mounting hole, data interface (13) on be provided with flange (16), data interface (13) arrange in the mounting hole, and through flange (16) and mounting panel (24) fixed connection, fixed shell (8) on be provided with mount pad (26), mount pad (26) be "worker" type, its joint is on the bottom surface of fixed shell (8), mount pad (26) on be provided with the threaded connection hole, fixing bolt (12) and threaded connection hole threaded connection, mount pad (26) on be provided with two ribbon (11), the one end of one of them ribbon (11) is provided with the ribbon head, mount pad (26) be the metal mount pad, two ribbon (11) all weld in on mount pad (26), fixed shell (8) on set up fixing bolt (12) arrange in the fixed of setting in ring channel (15) The two binding tapes (11) are bound on the annular groove (15), one binding tape (11) penetrates through a binding tape head on the other binding tape (11) to be fixed, and a lifting handle (7) is arranged on the straight cylinder (1);
the fixed limiting device (6) comprises a connecting sleeve (17), a mounting hole is formed in the connecting sleeve (17) and is a stepped hole, a reset spring (19) is arranged in the mounting hole, one end of the reset spring (19) abuts against the stepped hole of the mounting hole, a first thrust ball bearing (20) is arranged in the mounting hole, one end of the first thrust ball bearing (20) abuts against the other end of the reset spring (19), a threaded sleeve (18) is arranged in the mounting hole, a threaded hole (181) is formed in the threaded sleeve (18), one end of the threaded sleeve (18) abuts against one end of the first thrust ball bearing (20), a mounting groove (182) is formed in one end of the threaded sleeve (18), a second thrust ball bearing (21) is arranged in the mounting groove (182), and a plurality of clamping grooves (183) are formed in the wall of the mounting groove (182) in the axial direction, one end of the connecting sleeve (17) is fixedly connected with an end cover (23) through a bolt, a plurality of clamping teeth (231) are arranged on the end face of the end cover (23) opposite to the connecting sleeve (17) in a circumferential array mode, a pressing plate (22) is further arranged in the mounting groove (182), one end face of the pressing plate (22) is abutted to the second thrust ball bearing (21), a plurality of pressing columns (25) are arranged on the other end face of the pressing plate (22), a plurality of through holes (232) are formed in the end cover (23), the pressing columns (25) are arranged in the through holes (232), and the pressing columns (25) extend out of the end face of the end cover (23) in the initial state of the reset spring (19).
2. The automobile exhaust anti-cheating detection system based on the attitude sensor as recited in claim 1, wherein: the fixing device (4) comprises a shell (41), the shell (41) is of a hollow structure, a worm wheel (42) is arranged in the shell (41), a torsion spring (43) is arranged on one end face of the worm wheel (42), a clamping sleeve (44) is arranged at the other end of the torsion spring (43), the clamping sleeve (44) is rotatably arranged in the shell (41), the clamping sleeve (44) is cylindrical, a plurality of clamping grooves (441) are formed in the wall of the clamping sleeve, the clamping grooves (441) are L-shaped, the buckles (27) are also L-shaped and are matched with the clamping grooves (441), the number of the buckles (27) is the same as that of the clamping grooves (441), the end of the L-shaped short side of each buckle (27) is arc-shaped, one end of each clamping groove (441) is in arc transition with the connection part of the end part of the clamping sleeve (44), and an unlocking mechanism is further arranged on the shell (41), the unlocking mechanism comprises a lock cylinder (47), a worm (46) is coaxially connected with the lock cylinder (47), the worm (46) is meshed with the worm wheel (42), and the unlocking mechanism is arranged in the shell (41); the fixing structure is characterized by further comprising a fixing end cover (45), the fixing end cover (45) is fixed at the end portion of the shell (41), a plurality of inserting holes (451) are formed in the fixing end cover (45), the inserting holes (451) correspond to the clamping grooves (441), and the inserting holes (451) and the clamping grooves (441) are partially arranged in a staggered mode.
3. An anti-cheating detection method using the attitude sensor based automobile exhaust anti-cheating detection system of any one of claims 1-2, characterized in that: the method comprises the following steps:
s1, mounting a gas collecting cylinder for detecting tail gas on a tail gas pipe of an automobile, wherein the gas collecting cylinder is provided with a tail gas detection probe (5), the tail gas detection probe (5) is arranged in the tail gas pipe of the automobile, and the gas collecting cylinder is provided with a posture detection sensor (9);
s2, when the gas collecting cylinder and the tail gas detection probe (5) are installed on the tail gas pipe, the tail gas detection probe (5) detects the concentration of oxygen in real time and transmits the detected data to the upper computer system, and the upper computer system judges whether the gas collecting cylinder and the tail gas detection probe (5) are installed in place or not according to the concentration of the oxygen;
s21, acquiring data of the scale by the attitude detection sensor (9) after the automobile idles for 40-50 seconds, detecting the concentration of a compound in the tail gas in an automobile tail gas pipe by the tail gas detection probe (5) when the automobile idles, and detecting NO in the compound by the tail gas detection probe (5)XHas a concentration of 0 to 50ppm and CO2Has a concentration of 6-9% and O2When the concentration of the water is 0.8-1.5%, the concentration of CO is 3-10% and the concentration of THC is 300-8000 ppm, the upper computer system judges that the automobile starts to idle, and at the moment, the upper computer system starts to time and acquires data of the scale after timing for 40-50 seconds;
s3, acquiring attitude data of a current attitude detection sensor (9) as a scale and storing the data after an upper computer system detects that a gas collecting cylinder and a tail gas detection probe (5) are installed in place, wherein the attitude data of the attitude detection sensor (9) comprises an X-axis angle, a Y-axis angle and a Z-axis angle;
s31, acquiring data of the scale by continuously acquiring data of three groups of attitude detection sensors (9), and then taking an average value as scale data;
s4, starting detection by an upper computer system, detecting the tail gas in the tail gas pipe by a tail gas detection probe (5), transmitting the detected data to the upper computer system for comparison and storing the data;
s5, detecting attitude data of an attitude detection sensor (9) in real time by an upper computer system at the beginning of idling of the automobile, comparing the detected data with data of a scale to judge whether a gas collecting cylinder falls off or not, setting a pipe dropping threshold value by the upper computer system, and judging that the gas collecting cylinder falls off when absolute values of differences of X-axis angles, Y-axis angles and Z-axis angles of the attitude detection sensor (9) detected in real time and X-axis angles, Y-axis angles and Z-axis angles corresponding to the data of the scale exceed the pipe dropping threshold value;
and S51, the upper computer system is provided with a display module, and the display module displays oscillograms of posture changes of the X-axis angle, the Y-axis angle and the Z-axis angle in real time.
4. The automobile exhaust anti-cheating detection method based on the attitude sensor as recited in claim 3, wherein the method comprises the following steps: in step S5, the pipe-removing threshold is 5-7 deg.
5. The automobile exhaust anti-cheating detection method based on the attitude sensor as recited in claim 3, wherein the method comprises the following steps: and in the step S5, resetting the upper computer system after the upper computer system judges that the gas collecting cylinder falls off, and repeating the steps S1-S5 to detect again.
6. The automobile exhaust anti-cheating detection method based on the attitude sensor as recited in claim 3, wherein the method comprises the following steps: the method for judging whether the gas collecting cylinder and the tail gas detection probe (5) are installed in place in the step S2 is that the tail gas detection probe (5) detects the concentration of the ambient oxygen before being inserted into the gas collecting cylinder, then the concentration of the oxygen in the gas collecting cylinder is detected when the tail gas detection probe (5) is inserted into the gas collecting cylinder, the concentration of the ambient oxygen is compared with the concentration of the oxygen in the gas collecting cylinder, and when the concentration of the oxygen in the gas collecting cylinder is at least 0.2 percent lower than the concentration of the ambient oxygen, the tail gas detection probe is judged to be inserted into the gas collecting cylinder;
after the tail gas detection probe (5) is judged to be inserted into the gas collecting cylinder, the tail gas detection probe (5) and the gas collecting cylinder are continuously installed on the tail gas pipe, at the moment, the tail gas detection probe (5) is inserted into the tail gas pipe, the concentration of oxygen in the tail gas pipe is detected after the tail gas detection probe (5) and the gas collecting cylinder are installed in place, and when the concentration of oxygen in the tail gas pipe is at least 5% lower than that of ambient oxygen, the part where the tail gas detection probe (5) is inserted is judged to be the tail gas pipe.
7. The automobile exhaust anti-cheating detection method based on the attitude sensor as recited in claim 3, wherein the method comprises the following steps: and in the step S5, the upper computer system gives an alarm after the upper computer system detects that the gas collecting cylinder falls off.
8. The automobile exhaust anti-cheating detection method based on the attitude sensor as recited in claim 6, wherein the method comprises the following steps: in the step S1, when the tail gas detection probe (5) is inserted into the tail gas pipe, the tail gas detection probe (5) detects the concentration of carbon dioxide in the tail gas pipe, when the concentration of carbon dioxide in the tail gas pipe is higher than 3% of the concentration of carbon dioxide in the environment and the concentration of oxygen in the tail gas pipe is lower than 5% of the concentration of oxygen in the environment, it is determined that the tail gas detection probe (5) is inserted into the tail gas pipe, and after the tail gas detection probe (5) is inserted into the tail gas pipe by more than 30cm, the tail gas detection probe (5) and the gas collecting cylinder.
9. The automobile exhaust anti-cheating detection method based on the attitude sensor as recited in claim 3, wherein the method comprises the following steps: the method for calculating the difference between the data of the attitude detection sensor (9) and the data of the scale detected in real time in step S5 is:
X=abs(Xat present-XScale with a measuring device)
Y=abs(YAt present-YScale with a measuring device)
Z=abs(ZAt present-ZScale with a measuring device)
Wherein, XAt presentDetecting the X-axis angle value, X, of the sensor (9) for real-time detection of the attitudeScale with a measuring deviceIs the X-axis angle value of the scale data, X is the absolute value of the difference between the X-axis of the attitude detection sensor (9) and the X-axis of the scale data detected in real time, YAt presentAttitude detection sensor for real-time detection(9) Numerical value of the Y-axis angle of (Y)Scale with a measuring deviceIs the angle value of the Y axis of the scale data, Y is the absolute value of the difference between the Y axis of the attitude detection sensor (9) and the Y axis of the scale data detected in real time, ZAt presentDetecting the Z-axis angle value of the sensor (9) for real-time detection, ZScale with a measuring deviceThe Z-axis angle value of the scale data is obtained, and Z is the absolute value of the difference value between the Z axis of the attitude detection sensor (9) and the Z axis of the scale data detected in real time;
and when both X, Y and Z are larger than the pipe dropping threshold value, judging that the gas collecting cylinder drops.
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