A vehicle emission pollutant collection system

Abstract

This utility model relates to the field of emission detection technology, specifically a vehicle emission pollutant collection system, including a sampling probe, a spiral conduit, a separator, a gas analyzer, a flow meter, and a control terminal. The sampling probe is connected to one end of the spiral conduit, and the other end of the spiral conduit is connected to the separator. The separator has an opening at its upper end, which is connected to the inlet of the gas analyzer via a conduit. The exhaust port of the gas analyzer is connected to the flow meter. The control terminal is electrically connected to both the gas analyzer and the flow meter. This system solves the problem that high temperatures in the exhaust gas can easily damage the sensor during the collection process, thus affecting the accuracy of the final detection.

Description

Technical Field

[0001] This utility model relates to the field of emission detection technology, specifically a vehicle emission pollutant collection system. Background Technology

[0002] When inspecting regular vehicles, vehicle inspection stations typically simulate road driving using steady-state or simplified transient operating condition methods, employing portable emission measurement systems (PEMS) inserted into the vehicle's exhaust pipe to collect and detect exhaust gases. PEMS relies on specific gas sensors for detecting different types of pollutants. However, most sensors are not suitable for high temperatures; the high temperatures of the exhaust gases during collection can damage the sensors, thus affecting the accuracy of the final detection. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a vehicle emission pollutant collection system, comprising a sampling probe, a spiral conduit, a separator, a gas analyzer, a flow meter, and a control terminal; the sampling probe is connected to one end of the spiral conduit, and the other end of the spiral conduit is connected to the separator; the separator has an opening at its upper end, which is connected to the inlet of the gas analyzer via a conduit; the exhaust port of the gas analyzer is connected to the flow meter; and the control terminal is electrically connected to both the gas analyzer and the flow meter.

[0004] In a specific embodiment, the separator is a cylindrical tank.

[0005] The direction of airflow from the spiral duct is tangential to the inner wall of the separator.

[0006] In order to collect samples of emitted pollutants, the sampling probe is installed inside the exhaust pipe of the motor vehicle.

[0007] The gas analyzer includes a switching valve, a detection chamber, and an electrochemical sensor.

[0008] The detection chamber is equipped with a pulse emission light source and a photodetector.

[0009] The electrochemical sensor includes an oxygen detection sensor and a nitric oxide detection sensor.

[0010] The control terminal includes a control host and a display.

[0011] Beneficial Effects: This utility model is a vehicle emission pollutant collection system. Through a sampling probe, a spiral conduit, a separator, a gas analyzer, and a flow meter, it can collect and detect vehicle emission pollutants. The spiral conduit extends the movement path of the exhaust gas, thereby increasing heat loss and physically cooling the collected pollutants, ensuring that the sensors of the subsequent gas analyzer are protected from high-temperature damage. Simultaneously, the separator can separate the gaseous pollutants introduced through the spiral conduit into particulate matter, achieving separation of pollutant gases and particles and improving detection accuracy. This system solves the problem in existing portable emission measurement systems where high exhaust gas temperatures during collection can easily damage sensors, thus affecting the final detection accuracy. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a vehicle emission pollutant collection system. Detailed Implementation

[0013] Exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings.

[0014] Example

[0015] See Figure 1 This embodiment provides a vehicle emission pollutant collection system, including a sampling probe, a spiral conduit, a separator, a gas analyzer, a flow meter, and a control terminal. The sampling probe is connected to one end of the spiral conduit, enabling it to sample and collect emission pollutants. The spiral conduit physically cools the collected pollutants. The other end of the spiral conduit is connected to the separator, which has an opening at its upper end. This opening is connected to the inlet of the gas analyzer via a conduit, and the exhaust port of the gas analyzer is connected to the flow meter. The separator separates the emission pollutants, both gaseous and particulate matter, transported through the spiral conduit. The separated pollutant gas is then introduced into the gas analyzer for detection. The gas analyzer then guides the measured pollutant gas into the flow meter for flow rate detection. The control terminal is electrically connected to both the gas analyzer and the flow meter, allowing them to transmit the detected data to the control terminal for data storage.

[0016] When collecting and detecting pollutants emitted from motor vehicles, one end of a sampling probe is installed inside the vehicle's exhaust pipe. The probe draws exhaust gas from the exhaust flow and transmits it into a spiral duct. By designing the duct as a spiral, the path of the exhaust gas is lengthened, thereby increasing heat loss and protecting the sensors of the subsequent gas analyzer from high-temperature damage.

[0017] At this point, the exhaust gas drawn in and transmitted by the sampling probe and the spiral conduit includes both pollutant gases and particulate matter. Therefore, to achieve the separation of pollutant gases and particulate matter, the separator is a cylindrical tank, and the jet direction of the spiral conduit is tangential to the inner wall of the separator. The exhaust gas enters the separator tangentially, thus forming a rotating vortex. Under the action of centrifugal force, the particulate matter is thrown towards the inner wall of the separator, loses kinetic energy after colliding with the inner wall, and falls to the bottom of the separator; the separated pollutant gas is discharged through the upper opening.

[0018] The pollutant gas discharged from the separator is transmitted to a gas analyzer via a conduit. The gas analyzer can detect the concentrations of CO, CO2, HC, NOx, and O2 in the emitted pollutant gas. The gas analyzer includes a switching valve, a detection chamber, and an electrochemical sensor. The gas analyzer opens the switching valve to introduce the pollutant gas discharged from the separator into the detection chamber. The detection chamber is equipped with a pulsed emission light source and a photodetector. The pulsed emission light source emits laser light with different spectral absorption wavelengths into the detection chamber, and the photodetector receives the light signal absorbed and reflected by the pollutant gas and performs photoelectric conversion. The detection chamber can detect the gas concentrations of CO, CO2, and HC. The electrochemical sensor includes an oxygen detection sensor and a nitric oxide detection sensor, which can detect the gas concentrations of NOx and O2.

[0019] After the gas analyzer completes the detection of the gas concentration of the input pollutants, it introduces the pollutant gas into the flow meter through the exhaust port. After the flow meter detects the gas flow rate, it discharges the gas through its own exhaust port.

[0020] After the gas analyzer and flow meter complete their detection, they transmit the data results to a control terminal via wires. The control terminal includes a control host and a display. The control host receives and stores the detection data from the gas analyzer and flow meter. Simultaneously, the control host is connected to the display, enabling the display of real-time detection data.

Claims

1. A vehicle exhaust pollutant collection system, comprising: The device includes a sampling probe, a spiral conduit, a separator, a gas analyzer, a flow meter, and a control terminal. The sampling probe is connected to one end of the spiral conduit, and the other end of the spiral conduit is connected to the separator. The separator has an opening at its upper end, which is connected to the gas analyzer's inlet via a conduit. The gas analyzer's exhaust port is connected to the flow meter. The control terminal is electrically connected to both the gas analyzer and the flow meter.

2. The vehicle exhaust pollutant collection system of claim 1, wherein, The separator is a cylindrical tank.

3. The vehicle exhaust pollutant collection system of claim 2, wherein, The direction of airflow from the spiral duct is tangential to the inner wall of the separator.

4. The vehicle exhaust pollutant collection system of claim 1, wherein, The sampling probe is installed inside the exhaust pipe of the motor vehicle.

5. The vehicle exhaust pollutant collection system of claim 1, wherein, The gas analyzer includes a switching valve, a detection chamber, and an electrochemical sensor.

6. The vehicle exhaust pollutant collection system of claim 5, wherein, The detection chamber is equipped with a pulse emission light source and a photodetector.

7. The vehicle emission pollutant collection system according to claim 5, characterized in that, The electrochemical sensor includes an oxygen detection sensor and a nitric oxide detection sensor.

8. The vehicle exhaust pollutant collection system of claim 1, wherein, The control terminal includes a control host and a display.

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