CN205562503U - A portable intelligent vehicle exhaust gas detection device - Google Patents

Abstract

The utility model relates to a tail gas detection equipment, especially, portable intelligent automobile tail gas detection device, treat that gas acquisition union coupling main filter entrance point is examined, the first entrance point of tee bend solenoid valve is connected to the main filter exit end, the entrance point of return to zero filter is connected to the air acquisition union coupling, the second entrance point of tee bend solenoid valve is connected to the exit end of return to zero filter, the entrance point of air pump is connected to the exit end of tee bend solenoid valve, the entrance point of pressure detector is connected to the exit end of air pump, the entrance point of four-channel three-gas analysis instrument is connected to the exit end of pressure detector, the exit end of four-channel three-gas analysis instrument is connected the blast pipe, the exit end of calibrated gas storage device is connected the restricted aperture, the restricted aperture is connected the; on the basis of intelligent detection automobile exhaust, the pipeline that the device of being convenient for returns to zero has been designed, and in addition for the ease of detecting the calibration still designed calibration pipeline and device, improved the accuracy that detects data greatly.

Description

A portable intelligent vehicle exhaust gas detection device

technical field

The utility model relates to an exhaust gas detection device, in particular to a portable intelligent vehicle exhaust gas detection device.

Background technique

For the detection of automobile exhaust, some domestic discussions have been made on emission standards and detection technology. It is proposed to use the PC master-slave structure to detect the working conditions of automobile exhaust, but the specific components that can be detected are c0 and HC, which cannot be detected. Carry out comprehensive detection of harmful components of automobile exhaust. The specific development plan of the two-component infrared gas analyzer. Also can not be used for comprehensive detection automobile exhaust. According to the current domestic demand, a new type of portable vehicle exhaust detector has been developed. It uses a self-developed multi-component non-dispersive infrared (NDIR) gas sensor and a combination of commercial NOx and sensors, which can realize the detection of HC, CO, c02, NOx Online real-time detection of 5 kinds of automobile exhaust components such as O2 and O2, high sensitivity, good stability, small size, and easy to carry.

Improvements have been made in the industry. For example, a Chinese patent discloses a portable vehicle exhaust detector, application number: 201220536024.5, application date: 2012-10-18, including a main controller with a keyboard, and NDIR is connected to the main controller The four-channel three-component gas analysis module, oxygen sensor, nitrogen oxide sensor, pressure sensor and flow sensor, among which, the NDIR four-channel three-component gas analysis module is connected to the main controller through the RS-232 level conversion circuit, and the nitrogen oxide The object sensor is connected with the main controller through a signal conditioning circuit.

The disadvantage of the above technical solution is that it lacks a calibration function, and once it is out of alignment, it cannot be calibrated.

Contents of the invention

Aiming at the deficiencies of the prior art, the utility model provides a calibrated automobile exhaust detection device.

The technical scheme of the utility model is:

A portable intelligent vehicle exhaust detection device, characterized in that it includes a gas collection tube to be tested, a main filter, an air collection tube, a zero return filter, a three-way electromagnetic valve, an air pump, a pressure detector, four channels and three gas Analytical instrument, oxygen sensor, NO _X sensor, quality detection device, exhaust pipe, calibration gas storage device, one-way pressure switch and flow limiting hole, the gas collection pipe to be tested is a tubular shape set in accordance with the shape of the outlet end of the automobile exhaust pipe collection mechanism, the gas collection pipe to be detected is connected to the inlet end of the main filter, the outlet end of the main filter is connected to the first inlet port of the three-way electromagnetic valve, and the air collection pipe is connected to the inlet end of the return-to-zero filter. The outlet end of the zero return filter is connected to the second inlet end of the three-way electromagnetic valve, the outlet end of the three-way electromagnetic valve is connected to the inlet end of the air pump, and the outlet end of the air pump is connected to the inlet end of the pressure detector. The outlet end of the pressure detector is connected to the inlet end of the four-channel three-gas analysis instrument, the outlet end of the four-channel three-gas analysis instrument is connected to the exhaust pipe, and oxygen sensors are installed in the four-channel three-gas analysis instrument in sequence , NO _X sensor and quality detection device;

The outlet end of the calibration gas storage device is connected to a flow limiting hole, and a one-way pressure switch is also provided between the calibration gas storage device and the flow limiting hole, and the flow limiting hole is connected to the inlet end of the four-channel three-gas analysis instrument.

In order to eliminate the accumulative error of the instrument, after each test is completed, the instrument needs to perform a zero calibration process. The system uses a three-way solenoid valve to introduce clean air filtered by the zero return filter into the test air chamber to flush it, and then correct the zero point of the instrument. . Considering that after the instrument works for a long time, due to factors such as aging of components and changes in the gas path, it is not enough for the instrument to correct errors only by zero point calibration, so a standard gas input path is designed. Add gas of each component with known concentration from this channel to calibrate and calibrate the instrument. When the instrument is working in this state, the air pump stops, and the standard gas enters the analysis channel through the one-way pressure switch and the restrictor hole.

Further, the three-way electromagnetic valve, air pump, pressure detector, four-channel three-gas analysis instrument, oxygen sensor, _NOx sensor, and quality detection device are all connected to the microprocessor through data lines, and its function is to improve intelligent control. Level, its control software is the prior art, refer to Chinese patent: a portable vehicle exhaust detector, application number: 201220536024.5, application date: 2012-10-18.

Further, the microprocessor is an industrial-grade microprocessor MSP430F149I.

Further, the microprocessor is also provided with auxiliary circuits and input and output devices.

The beneficial effects of the utility model are: on the basis of the intelligent detection of automobile exhaust, the utility model designs a pipeline that is convenient for the device to return to zero. In addition, a calibration pipeline and a device are also designed for the convenience of detection and calibration, which greatly improves the accuracy of the detection data. accuracy.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure, 1. Gas collection tube to be tested; 2. Main filter; 3. Air collection tube; 4. Zero filter; 5. Three-way electromagnetic valve; 6. Air pump; 7. Pressure detector; 8. Four Channel three gas analysis instrument; 9. Oxygen sensor; 10. NO _X sensor; 11. Quality detection device; 12. Exhaust pipe; 13. Calibration gas storage device; 14. One-way pressure switch; 15. Flow limiting hole.

detailed description

The specific embodiment of the utility model will be further described below in conjunction with accompanying drawing:

As shown in Fig. 1, a kind of portable smart car exhaust detection device is characterized in that: it comprises gas collection pipe 1 to be tested, main filter 2, air collection pipe 3, return to zero filter 4, three-way electromagnetic valve 5 , air pump 6, pressure detector 7, four-channel three-gas analysis instrument 8, oxygen sensor 9, NO _X sensor 10, quality detection device 11, exhaust pipe 12, calibration gas storage device 13, one-way pressure switch 14 and current limiting Hole 15, the gas collection tube 1 to be detected is a tubular collection mechanism that matches the shape of the outlet end of the automobile exhaust pipe, the gas collection tube 1 is connected to the inlet end of the main filter 2, and the outlet end of the main filter 2 is connected to The first inlet end of the three-way electromagnetic valve 5, the air collection pipe 3 is connected to the inlet end of the zero-return filter 4, and the outlet end of the zero-return filter 4 is connected to the second inlet end of the three-way electromagnetic valve 5, so The outlet end of the three-way electromagnetic valve 5 is connected to the inlet end of the air pump 6, the outlet end of the air pump 6 is connected to the inlet end of the pressure detector 7, and the outlet end of the pressure detector 7 is connected to the four-channel three-gas analysis instrument 8 The inlet end, the outlet end of the four-channel three-gas analysis instrument 8 is connected to the exhaust pipe 12, and the four-channel three-gas analysis instrument 8 is sequentially installed with an oxygen sensor 9, a _NOx sensor 10 and a quality detection device 11 ;

The outlet end of the calibration gas storage device 13 is connected to a flow restriction hole 15, and a one-way pressure switch 14 is also provided between the calibration gas storage device 13 and the flow restriction hole 15, and the flow restriction hole 15 is connected to four-channel three-gas The inlet port of the analytical instrument 8.

The three-way electromagnetic valve 5, the air pump 6, the pressure detector 7, the four-channel three-gas analysis instrument 8, the oxygen sensor 9, the _NOx sensor 10, and the quality detection device 11 are all connected with the microprocessor through a data line, and its effect is To improve the intelligent control level, the control software is an existing technology, refer to the Chinese patent: a portable vehicle exhaust detector, application number: 201220536024.5, application date: 2012-10-18.

The microprocessor is an industrial grade microprocessor MSP430F149I.

The microprocessor is also provided with auxiliary circuits and input and output devices.

What described in above-mentioned embodiment and description just illustrates the principle of the utility model and the best embodiment, under the premise of not departing from the spirit and scope of the utility model, the utility model also can have various changes and improvements, these changes and improvements All fall within the scope of the utility model claimed.

Claims (4)

1. A portable intelligent vehicle exhaust detection device is characterized in that: it comprises a gas collection pipe to be checked, a main filter, an air collection pipe, a zero return filter, a three-way electromagnetic valve, an air pump, a pressure detector, and four channels Three gas analysis instruments, an oxygen sensor, a _NOx sensor, a quality detection device, an exhaust pipe, a calibration gas storage device, a one-way pressure switch and a flow limiting hole, and the gas collection tube to be tested is set to match the shape of the outlet end of the automobile exhaust pipe Tubular collection mechanism, the gas collection tube to be tested is connected to the inlet end of the main filter, the outlet end of the main filter is connected to the first inlet port of the three-way electromagnetic valve, and the air collection tube is connected to the inlet port of the zero return filter , the outlet end of the zero return filter is connected to the second inlet end of the three-way electromagnetic valve, the outlet end of the three-way electromagnetic valve is connected to the inlet end of the air pump, and the outlet end of the air pump is connected to the inlet end of the pressure detector, The outlet end of the pressure detector is connected to the inlet end of the four-channel three-gas analysis instrument, the outlet end of the four-channel three-gas analysis instrument is connected to the exhaust pipe, and the four-channel three-gas analysis instrument is sequentially installed with Oxygen sensor, NO _X sensor and quality detection device; The outlet end of the calibration gas storage device is connected to a flow limiting hole, and a one-way pressure switch is also provided between the calibration gas storage device and the flow limiting hole, and the flow limiting hole is connected to the inlet end of the four-channel three-gas analysis instrument. 2. The portable intelligent vehicle exhaust detection device according to claim 1, characterized in that: said three-way electromagnetic valve, air pump, pressure detector, four-channel three-gas analysis instrument, oxygen sensor, NO _X sensor, quality detection The devices are all connected with the microprocessor through data lines. 3. The portable smart vehicle exhaust detection device according to claim 2, characterized in that: the microprocessor is an industrial-grade microprocessor MSP430F149I. 4. The portable smart vehicle exhaust detection device according to claim 3, characterized in that: said microprocessor is also provided with auxiliary circuits and input and output devices.