CN206329372U - A kind of diagnostic device of simulation DPF failures - Google Patents
A kind of diagnostic device of simulation DPF failures Download PDFInfo
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- CN206329372U CN206329372U CN201621332296.8U CN201621332296U CN206329372U CN 206329372 U CN206329372 U CN 206329372U CN 201621332296 U CN201621332296 U CN 201621332296U CN 206329372 U CN206329372 U CN 206329372U
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- dpf
- particulate matter
- simulation
- matter sensors
- regulating valve
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Filtering Of Dispersed Particles In Gases (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The utility model provides the diagnostic device that a kind of simulation DPF fails, including the first mass flowmenter connected with the exhaust pipe of engine, the first thermocouple temperature sensor and the first particulate matter sensors device are sequentially provided with the blast pipe between engine and the first mass flowmenter；First mass flowmenter is connected with first flow regulating valve, the first flow regulating valve is connected with DPF air inlets, the second thermocouple temperature sensor and the second particulate matter sensors device are sequentially provided with the blast pipe of the DPF gas outlets, also including the bypass pipe with the first flow regulating valve and DPF parallel communications；By the output voltage changing rule for recording the first particulate matter sensors and the second particulate matter sensors under different operating modes and bypass flow, analyze and determine the limiting value that the second particulate matter sensors are exported during DPF total failure modes, realize the diagnostic function of simulation DPF failures.
Description
Technical field
The utility model is related to engine exhaust control field, especially a kind of diagnostic device of simulation DPF failures.
Background technology
Diesel engine has that the thermal efficiency is high, fuel economy is good, torque characteristics is good, low emission, reliability are high, long service life
The advantages of, it is increasingly becoming the major impetus of vehicle.Major pollutants in diesel exhaust gas are nitrogen oxides and particulate, especially
It is Particulate Emission, it has very big harm to human body.Diesel engine particulate trap technology is generally acknowledged maximally efficient in the world at present
Diesel particulates post-processing technology, be also the best exhaust gas particulate post-processing technology of commercial prospect in the world at present.
Particulate matter step storage (Diesel Particulate Filter, DPF) type most widely used at present is wall-flow type
Honeycomb ceramic filter body, is covered with many narrow ducts being parallel to each other vertically, adjoining cell channels on the gateway end face of carrier
Between there is porous media wall to be connected, the entrance and exit two ends in each duct are alternately blocked, when tail gas flows through porous wall, PM quilts
Trap in porous wall or be deposited on wall.But when the particulate matter of DPF accumulated insides is on the increase, diesel engine can be caused
Exhaust back pressure is too high, so as to influence the performance of diesel engine, it is therefore desirable to which DPF is regenerated.But regeneration temperature is too high, temperature
Gradient crosses conference and causes scorification, hardening cracks, while mechanical oscillation can cause DPF structural failures, and regenerates not exclusively or regenerates
Failure can cause the problems such as DPF is blocked, it is therefore desirable to carry out failure diagnosis to DPF.
Conventional simulation DPF failure diagnostic method be：Differential pressure pickup is installed at DPF two ends, according to the pressure difference at DPF two ends
Change judge failure degree.
The diagnostic device of conventional simulation DPF failures is to diagnose failure degree based on DPF pressure differences, and its major defect is
Be unable to direct measurement PM discharge, can not effective detection DPF different failure modes.In addition, exhaust back pressure is an arteries and veins in itself
Dynamic signal, using differential pressure pickup, in various working environments, accurately monitoring pressure at expulsion difficulty is very big in real time, and its result is inadequate
Accurately.Therefore, the DPF failure diagnosis method based on pressure difference will be difficult to meet more strict OBD standards, it is necessary to straight with sensor
Connect the particle concentration in measurement blast pipe.
Utility model content
For Shortcomings in the prior art, the utility model provides the diagnostic device that a kind of simulation DPF fails, it is intended to
Solve not directly to measure particle concentration in blast pipe, measurement accuracy difference and can not during traditional analog DPF failure diagnosis
The problems such as detecting DPF difference failure modes.
The utility model is to realize above-mentioned technical purpose by following technological means.
A kind of diagnostic device of simulation DPF failures, including the first mass flowmenter connected with the exhaust pipe of engine, in hair
The first thermocouple temperature sensor is sequentially provided with blast pipe between motivation and the first mass flowmenter and the first particulate matter is passed
Sensor arrangement；First mass flowmenter is connected with first flow regulating valve, the first flow regulating valve and DPF air inlets
Connect, the second thermocouple temperature sensor and the second particulate matter sensors device be sequentially provided with the blast pipe of the DPF gas outlets,
Also include the bypass pipe being connected in parallel with the first flow regulating valve and DPF.
Preferably, the bypass pipe front end is fixedly connected between the first mass flowmenter and first flow regulating valve
Blast pipe, centre is sequentially communicated second flow regulating valve and the second mass flowmenter, the exhaust of rear end and DPF outlet port
Pipeline is connected；
Preferably, the first particulate matter sensors device includes the first current stabilization box connect with blast pipe and described the
First aspiration pump of one current stabilization box connection and the first particulate matter sensors connected with the first aspiration pump；
Preferably, the second particulate matter sensors device includes the second current stabilization box connect with blast pipe and described the
Second aspiration pump of two current stabilization boxes connection and the second particulate matter sensors connected with the second aspiration pump；
Preferably, the first particulate matter sensors device is arranged on the exhaust pipe of engine by hickey.
Preferably, the second particulate matter sensors device is arranged on the exhaust pipe of engine by hickey.
Preferably, first particulate matter sensors and the second particulate matter sensors are using electric leakage streaming particulate matter sensing
Device.
The utility model eliminates the conventional diagnostic mode that differential pressure pickup is installed at DPF two ends, respectively in DPF upstream and downstream
Particulate matter sensors are installed, and DPF failure degrees are simulated by controlling the gas flow of bypass pipe, so as to reach direct measurement
The purpose of PM concentration and simulation DPF failure diagnosis functions under different failure states.
The utility model has advantages below compared with prior art：
1. the utility model eliminates pulse pneumatic by installing current stabilization box and aspiration pump additional before particulate matter sensors, realize
Current stabilization measures particle concentration, and measurement result is accurate.
2. on the exhaust pipe of engine and being equipped with flowmeter on bypass pipe, it can be obtained by the reading of two flowmeters
Specific exhaust gas leakage amount, as a result accurately, it is to avoid the inaccuracy of routine diagnostic method.
3. the utility model installs particulate matter sensors device in DPF upstream and downstream, it can be measured with direct measurement PM concentration
As a result accurate, error is smaller.Passed by recording the first particulate matter sensors and the second particulate matter under different operating modes and bypass flow
The output voltage changing rule of sensor, analyzes and determines the limit that the second particulate matter sensors are exported during DPF total failure modes
Value, realizes the diagnostic function of simulation DPF failures.
Brief description of the drawings
Fig. 1 is the structural representation for the diagnostic device that simulation DPF described in the utility model fails.
Fig. 2 is the particulate matter sensors output voltage that is measured in 2200 revolutions per minute of engine of the utility model anaplasia at any time
The curve of change.
Wherein, 1. first thermocouple temperature sensor；2. the first mass flowmenter；3. first flow regulating valve；4.DPF；
5. second flow regulating valve；6. the second mass flowmenter；7. the second thermocouple temperature sensor；8. the first current stabilization box；9. first
Aspiration pump；10. the first particulate matter sensors；11. the second current stabilization box；12. the second aspiration pump；13. the second particulate matter sensors.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment is further described to the utility model, but of the present utility model protect
Shield scope is not limited to this.
As shown in figure 1, a kind of diagnostic device of simulation DPF failures, including the first mass connected with the exhaust pipe of engine
The first thermocouple temperature sensor 1 is sequentially provided with flowmeter 2, the blast pipe between engine and the first mass flowmenter 2
With the first particulate matter sensors device；The first particulate matter sensors device include connected with blast pipe the first current stabilization box 8,
The first aspiration pump 9 connected with the first current stabilization box 8 and the first particulate matter sensors 10 connected with the first aspiration pump 9；Institute
State the first mass flowmenter 2 to connect with first flow regulating valve 3, the first flow regulating valve 3 is connected with DPF4 air inlets, institute
State and the second thermocouple temperature sensor 7 and the second particulate matter sensors device are sequentially provided with the blast pipe of DPF4 gas outlets, it is described
Second particulate matter sensors device includes connecting the second current stabilization box 11, connect with the second current stabilization box 11 second with blast pipe
Aspiration pump 12 and the second particulate matter sensors 13 with the second aspiration pump 12；The first current stabilization box 8, the first aspiration pump 9, second
Current stabilization box 11, the second aspiration pump 12 are used to eliminate pulse pneumatic, realize and particle concentration is measured under current stabilization state, and measurement result is accurate
Really.The thermocouple temperature sensor 8 of first thermocouple temperature sensor 1 and second is in order to the device is linked into OBD (cars
Carry diagnostic system) in after, according to the different leakage current signal to two measured thermocouple temperature sensors of delivery temperature
Handled and compensated, realize the first particulate matter sensors 10 and the second particulate matter sensors 13 equal energy in different delivery temperatures
Measure correct particle concentration signal.
Bypass pipe is connected in parallel with the flow control valve 3 and DPF4, and connection is fixed positioned at the in the bypass pipe front end
Blast pipe between one mass flowmenter 2 and first flow regulating valve 3, centre is sequentially communicated second flow regulating valve 5 and second
Mass flowmenter 6, rear end is connected with the discharge duct of DPF outlet port.
Embodiment 1
Engine closes second flow regulating valve 5 after steady state condition is preheating to, and opens first flow regulating valve 3, starts
The all waste gases of machine discharge directly by DPF4, now simulate the normal working conditions of DPF4；Then it is gradually opened Flow-rate adjustment
Valve 5, makes portion discharge flow to bypass pipe, such partial particulate flows out with exhaust, is reduced by DPF4 extraction flow, DPF4
The particle of seizure is reduced accordingly, and the PM concentration that the second particulate matter sensors 13 are detected becomes big, is now simulated DPF4 parts and is lost
The state of effect；With becoming larger for the aperture of second flow regulating valve 5, the extraction flow for flowing through bypass pipe is increasing, completely
Close first flow regulating valve 3, the PM concentration that now all waste gases are all measured by bypass pipe, the second particulate matter sensors 13
Reach the limit values, now simulate DPF4 total failure modes.
Diesel engine is operated under from idling to the steady state condition of other rotating speeds, records different operating modes and bypass pipe different flow
The changing rule of the output voltage of second particulate matter sensors 13 under state, when analyzing and determining DPF4 total failure modes, second
The limiting value that particulate matter sensors 13 are exported, realizes the diagnostic function of simulation DPF4 failures.
Embodiment 2
On the basis of the method for embodiment 1, make engine running speed in 2200r/min, moment of torsion is 85Nm, at 60 seconds
Bypass tube valve is gradually opened, DPF4 valves are closed at 80 seconds.Original state waste gas is all passed by the second particulate matter during DPF4
The output voltage of sensor 13 is about 0.05V, and the output voltage of the second particulate matter sensors 13 is become larger to 0.1V after bypass pipe is opened,
The output voltage of the second particulate matter sensors 13 reaches the limit values about 0.2V, the first particulate matter sensors 10 after DPF4 is completely closed
Output voltage is about 0.7V.It is specifically shown in Fig. 2 curves.
The embodiment for it is of the present utility model preferred embodiment, but the utility model is not limited to above-mentioned embodiment party
Formula, in the case of without departing substantially from substance of the present utility model, it is any apparent that those skilled in the art can make
Improvement, replacement or modification belong to protection scope of the present invention.
Claims (7)
1. a kind of diagnostic device of simulation DPF failures, it is characterised in that including the first quality stream connected with the exhaust pipe of engine
The first thermocouple temperature sensor is sequentially provided with gauge (2), the blast pipe between engine and the first mass flowmenter (2)
And the first particulate matter sensors device (1)；First mass flowmenter (2) connects with first flow regulating valve (3), and described
One flow control valve (3) is connected with DPF (4) air inlet, and the second thermocouple is sequentially provided with the blast pipe of DPF (4) gas outlet
Temperature sensor (7) and the second particulate matter sensors device, also including in parallel with the first flow regulating valve (3) and DPF (4)
The bypass pipe of connection.
2. the diagnostic device of simulation DPF failures according to claim 1, it is characterised in that the bypass pipe front end is fixed
Connection is set successively on the blast pipe between the first mass flowmenter (2) and first flow regulating valve (3), the bypass pipe
Put second flow regulating valve (5) and the second mass flowmenter (6), bypass pipe rear end and the discharge duct of DPF (4) outlet port
Connection.
3. the diagnostic device of simulation DPF failures according to claim 1, it is characterised in that the first particulate matter sensing
Device device includes the first current stabilization box (8) connected with blast pipe, the first aspiration pump (9) connected with the first current stabilization box (8)
The first particulate matter sensors (10) connected with the first aspiration pump (9).
4. the diagnostic device of simulation DPF failures according to claim 1, it is characterised in that the second particulate matter sensing
Device device includes the second current stabilization box (11) connected with blast pipe, the second aspiration pump connected with the second current stabilization box (11)
(12) the second particulate matter sensors (13) and with the second aspiration pump (12) connected.
5. the diagnostic device of simulation DPF failures according to claim 1, it is characterised in that the first particulate matter sensing
Device device is arranged on the exhaust pipe of engine by hickey.
6. the diagnostic device of simulation DPF failures according to claim 1, it is characterised in that the second particulate matter sensing
Device device is arranged on the exhaust pipe of engine by hickey.
7. the diagnostic device of simulation DPF failures according to claim 1, it is characterised in that the first particulate matter sensing
Device (10) and the second particulate matter sensors (13) are using electric leakage streaming particulate matter sensors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621332296.8U CN206329372U (en) | 2016-12-07 | 2016-12-07 | A kind of diagnostic device of simulation DPF failures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621332296.8U CN206329372U (en) | 2016-12-07 | 2016-12-07 | A kind of diagnostic device of simulation DPF failures |
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| CN206329372U true CN206329372U (en) | 2017-07-14 |
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| CN201621332296.8U Active CN206329372U (en) | 2016-12-07 | 2016-12-07 | A kind of diagnostic device of simulation DPF failures |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762061A (en) * | 2016-12-07 | 2017-05-31 | 江苏大学 | The diagnostic device and method of a kind of simulation DPF failures |
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2016
- 2016-12-07 CN CN201621332296.8U patent/CN206329372U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762061A (en) * | 2016-12-07 | 2017-05-31 | 江苏大学 | The diagnostic device and method of a kind of simulation DPF failures |
| CN106762061B (en) * | 2016-12-07 | 2020-03-31 | 江苏大学 | Diagnostic device and method for simulating DPF failure |
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