CN205172704U - Car SCR urea solution of system concentration and high on -line monitoring appearance - Google Patents
Car SCR urea solution of system concentration and high on -line monitoring appearance Download PDFInfo
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- CN205172704U CN205172704U CN201520930037.4U CN201520930037U CN205172704U CN 205172704 U CN205172704 U CN 205172704U CN 201520930037 U CN201520930037 U CN 201520930037U CN 205172704 U CN205172704 U CN 205172704U
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
Abstract
The utility model provides a car SCR urea solution of system concentration and high on -line monitoring appearance. The monitor based on magnetic coupling resonance principle, module, monitoring mode -selection module, data acquisition and processing module, coil design module, power module and automobile -used urea case take place including high frequency signal. Arrange measuring coil urea bottom of the case side in and misplace and place, with the urea solution contactless to adopt the self -resonance mode and the dislocation impedance match technique of coil, the improvement coil is from resonant frequency and the S11 parameter is high to urea solution and the sensitiveness of concetration change, thereby improves the SNR of detected signal. Carry out high frequency signal through high frequency signal emergence pair of module coil design module and input, gather and voltage conversion improvement system development efficiency from resonant frequency and S11 parametric signal to the coil through data acquisition and processing module. Realize the monitoring to urea liquid level height through the detecting coil from resonant frequency, realize the monitoring to urea concentration through detecting coil S11 parameter.
Description
Technical field
The utility model provides a kind of automobile on-line monitoring system, particularly relates to a kind of automobile selective catalytic reduction (selective catalytic reduction is called for short SCR) the system urea concentration based on magnetic coupling resonance principle and height on-line computing model.
Background technique
In order to meet the requirement of Engine Exhaust Emission regulation, selective catalytic reduction (SCR) becomes the after-treatment system of large diesel engine indispensability.This equipment by spray in engine exhaust pipe be 32.5% urea liquid, by the NO in motor exhaust
xbe reduced to N
2, thus realize diesel emissions NO
xminimizing.
In OBD regulation, 2 requirements are proposed to the engine system installing SCR additional: 1, must can realize the on-line monitoring (highly monitoring) to aqueous solution of urea carrying amount deficiency; 2, must be able to realize being diluted aqueous solution of urea or by the on-line monitoring (component monitoring) replaced with other solution.
The sensor for the monitoring of motor SCR system solution composition can seen on the market at present is mainly divided three classes: the principle utilizing optics, mechanical vibration and electricity respectively.Wherein WEMA company utilizes spectral characteristic have employed to utilize the sensor of spectral characteristic identification urea liquid composition; The sound wave that SSITechnologies company utilizes mechanical vibration to produce, monitors composition and the height of urea liquid respectively by velocity of wave and propagation time; Company of Infineon then proposes one and passes into electric current by solution, utilizes monitoring electrical conductivity of solution to judge the method for urea liquid composition.A general character defect of these methods is that this kind of sensor must be arranged in urea box, and contacts with urea liquid.But urea liquid has very strong burn into crystallization property, this will increase the maintenance cost of this kind of sensor greatly.
(application number: 201510187671.8) in patent " automobile SCR system urea for vehicle solution concentration on-line monitoring system and monitoring method " literary composition, propose a kind of contactless monitoring method based on magnetic coupling resonance principle, the method mainly adopts coil self-resonant mode, improves the receptance that coil both end voltage changes urea concentration.This kind of scheme, realize surveying urea liquid, but, the monitoring to urea liquid carrying amount deficiency is required in unrealized OBD regulation, namely unrealized urea liquid height to be monitored, and adopt coil self-resonant mode to improve this method of receptance to urea concentration change, greatly can increase coil design difficulty.
Summary of the invention
In order to solve prior art Problems existing, the utility model provides a kind of automobile SCR system urea concentration and height on-line computing model.
The utility model utilizes coil self-resonance and the impedance match technique based on dislocation adjustment, increases substantially the susceptibility of monitoring system to urea liquid height and change in concentration.Because the conductivity of urea liquid is very low, the susceptibility of its electromagnetic induction signal is poor, is unfavorable for carrying out high-performance detection.Therefore, the utility model utilizes impedance matching principle, by the adjustment misplaced between main Test coil and matched coil, the resistance value making matched coil reflex to testing circuit mates with the internal resistance of source, coil self-resonance is reached in conjunction with regulating frequency, significantly enhance the electromagnetic signal strength of system, thus improve the signal to noise ratio of testing signal.By detecting the monitoring of main Test coil self-resonant frequency realization to urea liquid height, by detecting the monitoring of matched coil S11 parameter realization to urea concentration.
A kind of automobile SCR system urea concentration that the utility model provides and height on-line computing model, it comprises high-frequency signal generation module, monitoring pattern selects module, data acquisition and procession module, coil design module, power module and urea for vehicle case;
Wherein, high-frequency signal generation module selects module to be connected by SMA interface with monitoring pattern, produces unique step swept-frequency signal within the scope of predeterminated frequency, realize the transmission to main Test coil and matched coil high-frequency signal by high-frequency signal generation module;
Monitoring pattern selection module realizes the gating to urea liquid height monitoring channel and urea concentration monitoring channel, and is connected with coil design module;
Coil design module comprises main Test coil, matched coil, and coil design module is close to the bottom of urea for vehicle case, and main Test coil, matched coil translation dislocation are placed;
Data acquisition and procession module is connected by SMA interface with coil design module, realize the collection to coil self-resonant frequency and S11 parameter, and the coil self-resonant frequency collected and S11 parameter are converted into corresponding voltage signal, then gather this voltage signal by the A/D modular converter of microcontroller;
Power module is all connected with high-frequency signal generation module, data acquisition and procession module and powers;
Urea for vehicle case loads urea liquid.
A kind of automobile SCR system urea concentration that the utility model provides with height on-line computing model monitoring method, its step and condition as follows:
One, online urea liquid height monitoring:
(1) select module that monitoring system is strobed into urea liquid height monitoring channel side by monitoring pattern, now, the coil in put in circuit is main Test coil;
(2) respectively data sampling is carried out to the coil self-resonant frequency corresponding at the urea liquid of different solutions height, record sampled result and building database;
A. in urea for vehicle case, add urea liquid, its mass concentration sets as required, and sampling solution height is from 20mm, and add sampling solution height is 1mm aqueous solution of urea at every turn, is 100mm to sampling solution height, is 81 sampling solution height altogether;
B. respectively the coil self-resonant frequency sampling under many group unlike signal frequencies is carried out to the urea liquid of solution height of sampling each time, namely to the urea liquid of each sampling solution height, successively change the frequency of high-frequency signal generation module output signal, 170MHz is incremented to from 145MHz, step-length is 100KHz, by the self-resonant frequency of data acquisition and procession module acquires matched coil, and the coil self-resonant frequency of collection is converted to corresponding magnitude of voltage, this voltage signal is gathered again by the A/D modular converter of microcontroller, using resonant frequency during coil self-resonance and current solution height as one group of data, according to said method, in units of group, obtain the 1st group to the 81st group sampled data, set up sampling database,
C. urea liquid height monitoring to be measured: urea liquid to be measured is put into urea box, urea concentration in urea box is remained on consistent with urea concentration when sampling; The successively frequency of high-frequency signal generation module output signal, 170MHz is incremented to from 145MHz, step-length is 100KHz, by data acquisition and procession module acquires matched coil coil self-resonant frequency at different frequencies, utilize look-up method, data in the database data obtained and step b set up compare, and can judge the solution height of urea liquid to be measured;
Two, online urea concentration monitoring monitoring:
(1) select module that monitoring system is strobed into urea concentration monitoring channel side by monitoring pattern, now, the coil in put in circuit is matched coil and main Test coil;
(2) utilize the impedance matching principle of dislocation adjustment to carry out impedence matching to main Test coil and matched coil, after impedence matching terminates, keep the horizontal equivalent of matched coil and main Test coil constant, change the concentration of urea liquid successively;
(3) respectively data sampling is carried out to the S11 parameter corresponding at different urea concentration solution, record sampled result and building database;
A. in urea for vehicle case, add the aqueous solution of urea that mass concentration is 0%, add the aqueous solution of urea that sampling quality concentration is 0.5%, be the aqueous solution of urea of 32.5% to sample solution sampling quality concentration at every turn, is 66 groups of sampling solution height altogether;
B. respectively to the sampling quality concentration of the aqueous solution of urea of the 1st group to the 66th group, the frequency of matched coil output signal is successively changed by high-frequency signal generation module, 90MHz is incremented to from 30MHz, step-length is 100KHz, by the S11 parameter under data acquisition and procession module acquires different frequency, and the S11 Parameter Switch collected is become corresponding magnitude of voltage, then gather this voltage signal by the A/D modular converter of microcontroller.Using S11 parameter and current solution concentration as one group of data, in units of group, carry out record, obtain the 1st group to the 66th group sampled data, set up sampling database;
C. urea concentration monitoring to be measured: urea liquid to be measured is put into urea box, and the urea height that urea height in urea box is remained on when sampling with is consistent.The frequency of matched coil output signal is successively changed by high-frequency signal generation module, 90MHz is incremented to from 30MHz, step-length is 100KHz, afterwards by the S11 parameter under data acquisition and procession module acquires different frequency, utilize look-up method, data in the database data obtained and step b set up compare, and can judge the concentration of urea liquid to be measured.
beneficial effect:the utility model provides a kind of automobile SCR system urea concentration and height on-line computing model.Described line monitor based on the design of magnetic coupling resonance principle, and proposes non-contact detection method.The measuring coil of described line monitor is placed in urea box bottom side and dislocation placement, measuring coil is avoided to contact with urea liquid, and adopt self-resonant mode and the dislocation impedance match technique of coil, improve coil self-resonant frequency and the S11 parameter receptance to urea liquid height and change in concentration.
Utilize impedance matching principle, by the adjustment misplaced between main Test coil and matched coil, the resistance value making matched coil reflex to testing circuit mates with the internal resistance of source, coil self-resonance is reached in conjunction with regulating frequency, significantly enhance the electromagnetic signal strength of system, thus improve the signal to noise ratio of testing signal.
By high-frequency signal generation module, high-frequency signal input is carried out to coil design module, by data acquisition and procession module, coil self-resonant frequency and S11 parameter signal are gathered and voltage transitions, improve system development efficiency.
The utility model adopts main Test coil and matched coil can realize the detection of urea liquid height and concentration simultaneously, the gating to urea liquid height monitoring channel and concentration monitor passage is realized by monitoring pattern selection module, by detecting the monitoring of main Test coil self-resonant frequency realization to urea liquid height, by detecting the monitoring of matched coil S11 parameter realization to urea concentration.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of a kind of automobile SCR system urea concentration of the present utility model and height on-line computing model.
Fig. 2 is that monitoring pattern selects module and coil design model calling schematic diagram.
Embodiment
embodiment 1as shown in Figure 1, a kind of automobile SCR system urea concentration that the utility model provides and height on-line computing model, comprise high-frequency signal generation module, monitoring pattern select module, data acquisition and procession module, coil design module, power module and urea for vehicle case;
Wherein, high-frequency signal generation module selects module to be connected by SMA interface with monitoring pattern, produces unique step swept-frequency signal within the scope of predeterminated frequency, realize the transmission to main Test coil and matched coil high-frequency signal by high-frequency signal generation module;
Monitoring pattern selection module realizes the gating to urea liquid height monitoring channel and urea concentration monitoring channel, and is connected with coil design module;
Coil design module comprises main Test coil, matched coil, and coil design module is close to the bottom of urea for vehicle case, and main Test coil, matched coil translation dislocation are placed;
Data acquisition and procession module is connected by SMA interface with coil design module, realize the collection to coil self-resonant frequency and S11 parameter, and the coil self-resonant frequency collected and S11 parameter are converted into corresponding voltage signal, then gather this voltage signal by the A/D modular converter of microcontroller;
Power module is all connected with high-frequency signal generation module, data acquisition and procession module and powers;
Urea for vehicle case loads urea liquid.
As shown in Figure 2, a kind of automobile SCR system urea concentration that the utility model provides with height on-line computing model monitoring method, its step and condition as follows:
One, online urea liquid height monitoring:
(1) select module that monitoring system is strobed into urea liquid height monitoring channel 1 side by monitoring pattern, now, the coil in put in circuit is main Test coil 2;
(2) respectively data sampling is carried out to the coil self-resonant frequency corresponding at the urea liquid of different solutions height, record sampled result and building database;
A. in urea box 3, add urea liquid 4, its mass concentration sets as required, and sampling solution height is from 20mm, and add sampling solution height is 1mm aqueous solution of urea at every turn, is 100mm to sampling solution height, is 81 sampling solution height altogether;
B. respectively the coil self-resonant frequency sampling under many group unlike signal frequencies is carried out to the urea liquid of solution height of sampling each time, namely to the urea liquid of each sampling solution height, successively change the frequency of high-frequency signal generation module output signal, 170MHz is incremented to from 145MHz, step-length is 100KHz, by the self-resonant frequency of data acquisition and procession module acquires matched coil 5, and the coil self-resonant frequency of collection is converted to corresponding magnitude of voltage, this voltage signal is gathered again by the A/D modular converter of microcontroller, using resonant frequency during coil self-resonance and current solution height as one group of data, according to said method, in units of group, obtain the 1st group to the 81st group sampled data, set up sampling database,
C. urea liquid height monitoring to be measured: urea liquid to be measured is put into urea box 3, urea concentration in urea box 3 is remained on consistent with urea concentration when sampling; The successively frequency of high-frequency signal generation module output signal, 170MHz is incremented to from 145MHz, step-length is 100KHz, by data acquisition and procession module acquires matched coil 5 coil self-resonant frequency at different frequencies, utilize look-up method, data in the database data obtained and step b set up compare, and can judge the solution height of urea liquid to be measured;
Two, online urea concentration monitoring:
(1) select module that monitoring system is strobed into urea concentration monitoring channel 6 side by monitoring pattern, now, the coil in put in circuit is matched coil 5 and main Test coil 2;
(2) utilize the impedance matching principle of dislocation adjustment to carry out impedence matching to main Test coil 2 and matched coil 5, after impedence matching terminates, keep the horizontal equivalent of matched coil 5 and main Test coil 2 constant, change the concentration of urea liquid successively;
(3) respectively data sampling is carried out to the S11 parameter corresponding at different urea concentration solution, record sampled result and building database;
A. in urea for vehicle case 3, add the aqueous solution of urea that mass concentration is 0%, add the aqueous solution of urea that sampling quality concentration is 0.5%, be the aqueous solution of urea of 32.5% to sample solution sampling quality concentration at every turn, is 66 groups of sampling solution height altogether;
B. respectively to the sampling quality concentration of the aqueous solution of urea of the 1st group to the 66th group, the frequency of matched coil 5 output signal is successively changed by high-frequency signal generation module, 90MHz is incremented to from 30MHz, step-length is 100KHz, by the S11 parameter under data acquisition and procession module acquires different frequency, and the S11 Parameter Switch collected is become corresponding magnitude of voltage, then gather this voltage signal by the A/D modular converter of microcontroller.Using S11 parameter and current solution concentration as one group of data, in units of group, carry out record, obtain the 1st group to the 66th group sampled data, set up sampling database;
C. urea concentration monitoring to be measured: urea liquid to be measured is put into urea box 3, and the urea height that urea height in urea box 3 is remained on when sampling with is consistent.The frequency of matched coil 5 output signal is successively changed by high-frequency signal generation module, 90MHz is incremented to from 30MHz, step-length is 100KHz, afterwards by the S11 parameter under data acquisition and procession module acquires different frequency, utilize look-up method, data in the database data obtained and step b set up compare, and can judge the concentration of urea liquid to be measured.
Claims (1)
1. a SCR system urea concentration and height on-line computing model, SCR is the abbreviation of selective catalytic reduction, it is characterized in that, it comprises high-frequency signal generation module, monitoring pattern selects module, data acquisition and procession module, coil design module, power module and urea for vehicle case;
Wherein, high-frequency signal generation module selects module to be connected by SMA interface with monitoring pattern, produces unique step swept-frequency signal within the scope of predeterminated frequency, realize the transmission main Test coil and matched coil being carried out to high-frequency signal by high-frequency signal generation module;
Monitoring pattern selection module realizes the gating to urea liquid height monitoring channel and urea concentration monitoring channel, and is connected with coil design module;
Coil design module comprises main Test coil, matched coil, and coil design module is close to the bottom of urea for vehicle case, and main Test coil, matched coil translation dislocation place;
Data acquisition and procession module is connected by SMA interface with coil design module, realize the collection to coil self-resonant frequency and S11 parameter, and the coil self-resonant frequency collected and S11 parameter are converted into corresponding voltage signal, then gather this voltage signal by the A/D modular converter of microcontroller;
Power module is all connected with high-frequency signal generation module, data acquisition and procession module and powers;
Urea for vehicle case loads urea liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520930037.4U CN205172704U (en) | 2015-11-21 | 2015-11-21 | Car SCR urea solution of system concentration and high on -line monitoring appearance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520930037.4U CN205172704U (en) | 2015-11-21 | 2015-11-21 | Car SCR urea solution of system concentration and high on -line monitoring appearance |
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| Publication Number | Publication Date |
|---|---|
| CN205172704U true CN205172704U (en) | 2016-04-20 |
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|---|---|---|---|
| CN201520930037.4U Withdrawn - After Issue CN205172704U (en) | 2015-11-21 | 2015-11-21 | Car SCR urea solution of system concentration and high on -line monitoring appearance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298607A (en) * | 2015-11-21 | 2016-02-03 | 吉林大学 | Online monitoring instrument and method for concentration and height of urea solution of automobile SCR system |
| CN109923290A (en) * | 2016-10-12 | 2019-06-21 | 世倍特集团有限责任公司 | Method and apparatus for monitoring the tank content of the storage tank of exhausted gas post-processing system |
-
2015
- 2015-11-21 CN CN201520930037.4U patent/CN205172704U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298607A (en) * | 2015-11-21 | 2016-02-03 | 吉林大学 | Online monitoring instrument and method for concentration and height of urea solution of automobile SCR system |
| CN105298607B (en) * | 2015-11-21 | 2018-04-06 | 吉林大学 | A kind of automobile SCR system urea concentration and height on-line computing model and monitoring method |
| CN109923290A (en) * | 2016-10-12 | 2019-06-21 | 世倍特集团有限责任公司 | Method and apparatus for monitoring the tank content of the storage tank of exhausted gas post-processing system |
| CN109923290B (en) * | 2016-10-12 | 2021-05-18 | 世倍特集团有限责任公司 | Method and device for monitoring the tank contents of an exhaust gas aftertreatment system tank, and vehicle |
| US11261773B2 (en) | 2016-10-12 | 2022-03-01 | Vitesco Technologies GmbH | Method and device for monitoring the tank content of a storage tank of an exhaust-gas treatment system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160420 Effective date of abandoning: 20180406 |