CN105298607B - A kind of automobile SCR system urea concentration and height on-line computing model and monitoring method - Google Patents

A kind of automobile SCR system urea concentration and height on-line computing model and monitoring method Download PDF

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Publication number
CN105298607B
CN105298607B CN201510806668.XA CN201510806668A CN105298607B CN 105298607 B CN105298607 B CN 105298607B CN 201510806668 A CN201510806668 A CN 201510806668A CN 105298607 B CN105298607 B CN 105298607B
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urea
coil
module
frequency
concentration
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CN105298607A (en
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袁新枚
殷悦
孙科
李海湘
邢增臻
洪国凯
夏静林
何阳
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Kalantu (Zhejiang) Environmental Protection Technology Co.,Ltd.
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Jilin University
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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 present invention provides a kind of automobile SCR system urea concentration and height on-line computing model and monitoring method.Described monitor is based on magnetic coupling resonance principle, including module, monitoring pattern selecting module, data acquisition and procession module, coil design module, power module and urea for vehicle case occur for high-frequency signal.Measuring coil is placed in urea box bottom side and the placement that misplaces, do not contacted with urea liquid, and using the self-resonant mode and dislocation impedance match technique of coil, coil self-resonant frequency and S11 parameters are improved to urea liquid height and the sensitiveness of change in concentration, so as to improve the signal to noise ratio of detection signal.Module is occurred by high-frequency signal high-frequency signal input is carried out to coil design module, by the way that data acquisition and procession module is to coil self-resonant frequency and S11 parameter signals gather and voltage conversion, improve system development efficiency.Monitoring to urea level height is realized by detection coil self-resonant frequency；Monitoring to urea concentration is realized by detection coil S11 parameters.

Description

A kind of automobile SCR system urea concentration and height on-line computing model and monitoring Method
Technical field
The present invention provides a kind of automobile on-line monitoring system, more particularly to a kind of automobile based on magnetic coupling resonance principle SCR（SCR abbreviation SCR）System urea concentration and height on-line computing model and monitoring side Method.
Background technology
In order to meet the requirement of Engine Exhaust Emission regulation, SCR（SCR）Become large diesel engine Indispensable after-treatment system.The equipment in the exhaust pipe of engine by spraying into the urea liquid for 32.5%, by motor exhaust In NOXIt is reduced to N2, so as to realize diesel emissions NOXReduction.
Two point requirements are proposed to the engine system for installing SCR additional in OBD regulations：1st, can must realize to urea The on-line monitoring of aqueous solution carrying amount deficiency（Highly monitor）；2nd, be able to must realize aqueous solution of urea is diluted or by with its The on-line monitoring of his solution substitution（Component monitoring）.
The sensor for engine SCR System Solution component monitorings that can see on the market at present is broadly divided into three Class：It is utilized respectively the principle of optics, mechanical oscillation and electricity.Wherein WEMA companies are employed using spectral characteristic and utilize spectrum Characteristic recognizes the sensor of urea liquid composition；SSI Technologies companies utilize sound wave caused by mechanical oscillation, pass through Velocity of wave and propagation time monitor the composition and height of urea liquid respectively；And company of Infineon then proposes one kind and will led in solution Enter electric current, utilize the method for monitoring electrical conductivity of solution and judging urea liquid composition.One general character defect of these methods is, this kind of Sensor is necessarily mounted in urea box, and is contacted with urea liquid.However, urea liquid has very strong burn into crystallization special Property, this will greatly increase the maintenance cost of this kind of sensor.
In patent " automobile SCR system urea for vehicle solution concentration on-line monitoring system and monitoring method " text（Application Number：201510187671.8）, it is proposed that a kind of contactless monitoring method based on magnetic coupling resonance principle, this method are main Using coil self-resonant mode, the sensitiveness that coil both end voltage changes to urea concentration is improved.Such a scheme, realization pair Urea liquid is surveyed, and still, the monitoring required in OBD regulations to urea liquid carrying amount deficiency is not implemented, that is, is not implemented to urea Solution height is monitored, and used coil self-resonant mode is improved to this method of the sensitiveness of urea concentration change, can be big Increase ledger line circle design difficulty.
The content of the invention
In order to solve the problems, such as that prior art is present, the present invention provides a kind of automobile SCR system urea concentration and height Spend on-line computing model and monitoring method.
Impedance match technique of the present invention using coil self-resonance and based on dislocation adjustment, increases substantially monitoring system pair The susceptibility of urea liquid height and change in concentration.Because the electrical conductivity of urea liquid is very low, the sensitivity of its electromagnetic induction signal Degree is poor, is unfavorable for carrying out high-performance detection.Therefore, the present invention utilizes impedance matching principle, passes through main detection coil and matched line The regulation to be misplaced between circle, matched coil is reflexed to the impedance value of detection circuit and matched with the internal resistance of source, with reference to regulating frequency Reach coil self-resonance, significantly enhance the electromagnetic signal strength of system, so as to improve the signal to noise ratio of detection signal.Pass through Monitoring of the main detection coil self-resonant frequency realization to urea liquid height is detected, is realized by detecting matched coil S11 parameters Monitoring to urea concentration.
A kind of automobile SCR system urea concentration provided by the invention and height on-line computing model, it includes high frequency letter Number module, monitoring pattern selecting module, data acquisition and procession module, coil design module, power module and automobile-used urine occurs Plain case；
Wherein, high-frequency signal generation module is connected by SMA interfaces with monitoring pattern selecting module, is sent out by high-frequency signal Raw module produces unique step swept-frequency signal in the range of predeterminated frequency, realizes the hair to main detection coil and matched coil high-frequency signal Send；
Monitoring pattern selecting module realizes the choosing that passage and urea concentration monitoring passage are highly monitored to urea liquid It is logical, and be connected with coil design module；
Coil design module includes main detection coil, matched coil, and coil design module is close to the bottom of urea for vehicle case Portion, also, the translation dislocation of main detection coil, matched coil is placed；
Data acquisition and procession module is connected with coil design module by SMA interfaces, is realized to coil self-resonant frequency And the collection of S11 parameters, and the coil self-resonant frequency collected and S11 parameters are converted into corresponding voltage signal, then The voltage signal is gathered by the A/D modular converters of microcontroller；
With high-frequency signal module occurs for power module, data acquisition and procession module is all connected with and is powered；
Urea for vehicle box installed enters urea liquid.
The monitoring method of a kind of automobile SCR system urea concentration provided by the invention and height on-line computing model, its Step and condition are as follows：
First, online urea liquid highly monitors：
（1）Monitoring system is strobed into by urea liquid by monitoring pattern selecting module and highly monitors passage side, now, The coil accessed in circuit is main detection coil；
（2）Data sampling, note are carried out to coil self-resonant frequency corresponding to the urea liquid in different solutions height respectively Record sampled result and establish database；
A. add urea liquid in urea for vehicle case, its mass concentration is set as needed, sampling solution height from 20mm starts, and it is 1mm aqueous solution of urea to add sampling solution height every time, is 100mm to solution height is sampled, is altogether 81 Sample solution height；
B. coil under multigroup unlike signal frequency is carried out to the urea liquid for sampling solution height each time respectively from humorous Vibration frequency samples, i.e. the urea liquid to each sampling solution height, gradually changes high-frequency signal and module output signal occurs Frequency, 170MHz, step-length 100KHz are incremented to from 145MHz, oneself of matched coil is gathered by data acquisition and procession module Resonant frequency, and the coil self-resonant frequency of collection is converted into corresponding magnitude of voltage, then the A/D moduluss of conversion for passing through microcontroller Block gathers the voltage signal, using resonant frequency during coil self-resonance and current solution height as one group of data, according to said method, In units of group, the 1st group to the 81st group sampled data is obtained, establishes sampling database；
C. urea liquid to be measured highly monitors：Urea liquid to be measured is put into urea box, makes urea concentration in urea box It is maintained at consistent with urea concentration during sampling；Gradually the frequency of module output signal occurs for high-frequency signal, is incremented by from 145MHz To 170MHz, step-length 100KHz, the coil of matched coil at different frequencies is gathered certainly by data acquisition and procession module Resonant frequency, using look-up method, by obtained data compared with the data in the database that step b is established, you can judgement is treated Survey the solution height of urea liquid；
2nd, online urea concentration monitoring monitoring：
（1）Monitoring system is strobed into by urea concentration by monitoring pattern selecting module and monitors passage side, now, access Coil in circuit is matched coil and main detection coil；
（2）Impedance matching, impedance are carried out to main detection coil and matched coil using the impedance matching principle of dislocation adjustment After matching terminates, keep the horizontal range of matched coil and main detection coil constant, change the concentration of urea liquid successively；
（3）Respectively to corresponding to different urea concentration solution S11 parameters carry out data sampling, record sampled result and Establish database；
A. the aqueous solution of urea that mass concentration is 0% is added in urea for vehicle case, increase every time adds sampling quality concentration It is altogether 66 groups of sampling solution to the aqueous solution of urea that sample solution sampling quality concentration is 32.5% for 0.5% aqueous solution of urea Highly；
B. module is occurred by high-frequency signal to the sampling quality concentration of the 1st group to the 66th group of aqueous solution of urea respectively Gradually change matched coil output signal frequency, be incremented to 90MHz, step-length 100KHz from 30MHz, by data acquisition with S11 parameters under processing module collection different frequency, and by the S11 Parameter Switch collected into corresponding magnitude of voltage, then pass through The A/D modular converters of microcontroller gather the voltage signal.Using S11 parameters and current solution concentration as one group of data, with group Recorded for unit, obtain the 1st group to the 66th group sampled data, establish sampling database；
C. urea concentration monitoring to be measured：Urea liquid to be measured is put into urea box, makes urea height in urea box It is maintained at highly consistent with a urea during sampling.Module is occurred by high-frequency signal and gradually changes matched coil output signal Frequency, 90MHz, step-length 100KHz are incremented to from 30MHz, are gathered afterwards by data acquisition and procession module under different frequency S11 parameters, using look-up method, by obtained data compared with the data in the database that step b is established, you can judgement treat Survey the concentration of urea liquid.
Beneficial effect：The present invention provides a kind of automobile SCR system urea concentration and height on-line computing model and monitoring Method.Described line monitor is designed based on magnetic coupling resonance principle, and proposes non-contact detection method.Described line is supervised The measuring coil for surveying instrument is placed in urea box bottom side and dislocation placement, avoids measuring coil from being contacted with urea liquid, and use coil Self-resonant mode and dislocation impedance match technique, improve coil self-resonant frequency and S11 parameters to urea liquid height and dense Spend the sensitiveness of change.
Using impedance matching principle, by the regulation to be misplaced between main detection coil and matched coil, make matched coil anti- The impedance value for being mapped to detection circuit matches with the internal resistance of source, reaches coil self-resonance with reference to regulating frequency, significantly enhances and be The electromagnetic signal strength of system, so as to improve the signal to noise ratio of detection signal.
Module is occurred by high-frequency signal high-frequency signal input is carried out to coil design module, pass through data acquisition and procession Module is to coil self-resonant frequency and S11 parameter signals gather and voltage conversion, improves system development efficiency.
The present invention can realize the detection of urea liquid height and concentration simultaneously using main detection coil and matched coil, pass through Monitoring pattern selecting module realizes the gating that passage and concentration monitor passage are highly monitored to urea liquid, by detecting main detection Coil self-resonant frequency realizes the monitoring to urea liquid height, is realized by detecting matched coil S11 parameters to urea concentration Monitoring.
Brief description of the drawings
Fig. 1 is a kind of structured flowchart of automobile SCR system urea concentration with height on-line computing model of the present invention.
Fig. 2 is monitoring pattern selecting module and coil design module connection diagram.
Embodiment
Embodiment 1 is as shown in figure 1, a kind of automobile SCR system urea concentration provided by the invention is supervised online with height Instrument is surveyed, including module, monitoring pattern selecting module, data acquisition and procession module, coil design module, electricity occur for high-frequency signal Source module and urea for vehicle case；
Wherein, high-frequency signal generation module is connected by SMA interfaces with monitoring pattern selecting module, is sent out by high-frequency signal Raw module produces unique step swept-frequency signal in the range of predeterminated frequency, realizes the hair to main detection coil and matched coil high-frequency signal Send；
Monitoring pattern selecting module realizes the choosing that passage and urea concentration monitoring passage are highly monitored to urea liquid It is logical, and be connected with coil design module；
Coil design module includes main detection coil, matched coil, and coil design module is close to the bottom of urea for vehicle case Portion, also, the translation dislocation of main detection coil, matched coil is placed；
Data acquisition and procession module is connected with coil design module by SMA interfaces, is realized to coil self-resonant frequency And the collection of S11 parameters, and the coil self-resonant frequency collected and S11 parameters are converted into corresponding voltage signal, then The voltage signal is gathered by the A/D modular converters of microcontroller；
With high-frequency signal module occurs for power module, data acquisition and procession module is all connected with and is powered；
Urea for vehicle box installed enters urea liquid.
As shown in Fig. 2 the prison of a kind of automobile SCR system urea concentration provided by the invention and height on-line computing model Survey method, its step and condition are as follows：
First, online urea liquid highly monitors：
（1）Monitoring system is strobed into by urea liquid by monitoring pattern selecting module and highly monitors the side of passage 1, this When, the coil accessed in circuit is main detection coil 2；
（2）Data sampling, note are carried out to coil self-resonant frequency corresponding to the urea liquid in different solutions height respectively Record sampled result and establish database；
A. urea liquid 4 is added in urea box 3, its mass concentration is set as needed, samples solution height from 20mm Start, it is 1mm aqueous solution of urea to add sampling solution height every time, is 100mm to solution height is sampled, and is altogether 81 samplings Solution height；
B. coil under multigroup unlike signal frequency is carried out to the urea liquid for sampling solution height each time respectively from humorous Vibration frequency samples, i.e. the urea liquid to each sampling solution height, gradually changes high-frequency signal and module output signal occurs Frequency, 170MHz, step-length 100KHz are incremented to from 145MHz, matched coil 5 is gathered by data acquisition and procession module Self-resonant frequency, and the coil self-resonant frequency of collection is converted into corresponding magnitude of voltage, then changed by the A/D of microcontroller Module gathers the voltage signal, using resonant frequency during coil self-resonance and current solution height as one group of data, by this side Method, in units of group, the 1st group to the 81st group sampled data is obtained, establishes sampling database；
C. urea liquid to be measured highly monitors：Urea liquid to be measured is put into urea box 3, makes urea in urea box 3 dense Degree is maintained at consistent with urea concentration during sampling；Gradually the frequency of module output signal occurs for high-frequency signal, is passed from 145MHz Increase to 170MHz, step-length 100KHz, the coil of matched coil 5 at different frequencies is gathered by data acquisition and procession module Self-resonant frequency, using look-up method, by obtained data compared with the data in the database that step b is established, you can judge The solution height of urea liquid to be measured；
2nd, online urea concentration monitoring monitoring：
（1）Monitoring system is strobed into by urea concentration by monitoring pattern selecting module and monitors the side of passage 6, now, is connect It is matched coil 5 and main detection coil 2 to enter the coil in circuit；
（2）Impedance is carried out to main detection coil 2 and matched coil 5 using the impedance matching principle of the adjustment of translation dislocation 7 Match somebody with somebody, after impedance matching terminates, keep the horizontal range of matched coil 5 and main detection coil 2 constant, change urea liquid successively Concentration；
（3）Respectively to corresponding to different urea concentration solution S11 parameters carry out data sampling, record sampled result and Establish database；
A. the aqueous solution of urea that mass concentration is 0% is added in urea for vehicle case 3, it is dense to add sampling quality for increase every time The aqueous solution of urea for 0.5% is spent, it is molten for 66 groups of samplings altogether to the aqueous solution of urea that sample solution sampling quality concentration is 32.5% Liquid height；
B. module is occurred by high-frequency signal to the sampling quality concentration of the 1st group to the 66th group of aqueous solution of urea respectively Gradually change the frequency of the output signal of matched coil 5, be incremented to 90MHz from 30MHz, step-length 100KHz, pass through data acquisition The S11 parameters under different frequency are gathered with processing module, and by the S11 Parameter Switch collected into corresponding magnitude of voltage, then lead to The A/D modular converters for crossing microcontroller gather the voltage signal.Using S11 parameters and current solution concentration as one group of data, with Group is recorded for unit, is obtained the 1st group to the 66th group sampled data, is established sampling database；
C. urea concentration monitoring to be measured：Urea liquid to be measured is put into urea box 3, makes urea in urea box 3 high Degree is maintained at highly consistent with a urea during sampling.Module is occurred by high-frequency signal and gradually changes the output letter of matched coil 5 Number frequency, be incremented to 90MHz, step-length 100KHz from 30MHz, pass through data acquisition and procession module afterwards and gather different frequencies S11 parameters under rate, using look-up method, by obtained data compared with the data in the database that step b is established, you can sentence The concentration of disconnected urea liquid to be measured.

Claims (2)

1. a kind of automobile SCR system urea concentration and height on-line computing model, SCR is the abbreviation of SCR, Set characterized in that, it includes high-frequency signal generation module, monitoring pattern selecting module, data acquisition and procession module, coil Count module, power module and urea for vehicle case；
Wherein, high-frequency signal generation module is connected by SMA interfaces with monitoring pattern selecting module, and mould occurs by high-frequency signal Block produces unique step swept-frequency signal in the range of predeterminated frequency, realizes the hair that high-frequency signal is carried out to main detection coil and matched coil Send；
Monitoring pattern selecting module realizes the gating that passage and urea concentration monitoring passage are highly monitored to urea liquid, and It is connected with coil design module；
Coil design module includes main detection coil, matched coil, and coil design module is close to the bottom of urea for vehicle case, and Main detection coil, matched coil translation dislocation are placed；
Data acquisition and procession module is connected with coil design module by SMA interfaces, is realized to coil self-resonant frequency and S11 The collection of parameter, and the coil self-resonant frequency collected and S11 parameters are converted into corresponding voltage signal, then by micro- The A/D modular converters of controller gather the magnitude of voltage；
With high-frequency signal module occurs for power module, data acquisition and procession module is all connected with and is powered；
Urea for vehicle box installed enters urea liquid.
2. a kind of automobile SCR system urea concentration as claimed in claim 1 exists with height on-line computing model, its feature In, its monitoring method the step of and condition is as follows：
First, online urea liquid highly monitors：
（1）Monitoring system is strobed into by urea liquid by monitoring pattern selecting module and highly monitors passage side, now, access Coil in circuit is main detection coil；
（2）Data sampling is carried out to coil self-resonant frequency corresponding to the urea liquid in different solutions height respectively, record is adopted Sample result and establish database；
A. urea liquid is added in urea for vehicle case, its mass concentration is set as needed, and sampling solution height is opened from 20mm Begin, it is 1mm aqueous solution of urea to add sampling solution height every time, is 100mm to solution height is sampled, molten for 81 samplings altogether Liquid height；
B. the coil self-resonance frequency under multigroup unlike signal frequency is carried out to the urea liquid for sampling solution height each time respectively Rate samples, i.e. the urea liquid to each sampling solution height, gradually changes the frequency that module output signal occurs for high-frequency signal, 170MHz, step-length 100KHz are incremented to from 145MHz, passes through coil self-resonance corresponding to the collection of data acquisition and procession module Frequency, and the coil self-resonant frequency of collection is converted into corresponding magnitude of voltage, then adopted by the A/D modular converters of microcontroller Collect the magnitude of voltage, using resonant frequency during coil self-resonance and current solution height as one group of data, according to said method, using group as Unit, the 1st group to the 81st group sampled data is obtained, establishes sampling database；
C. urea liquid to be measured highly monitors：Urea liquid to be measured is put into urea box, keeps urea concentration in urea box Consistent with urea concentration during sampling；Gradually the frequency of module output signal occurs for high-frequency signal, is incremented to from 145MHz 170MHz, step-length 100KHz, matched coil coil at different frequencies is gathered from humorous by data acquisition and procession module Vibration frequency, using look-up method, by obtained data compared with the data in the database that step b is established, you can judge to be measured The solution height of urea liquid；
2nd, online urea concentration monitoring monitoring：
（1）Monitoring system is strobed into by urea concentration by monitoring pattern selecting module and monitors passage side, now, accesses circuit In coil be matched coil and main detection coil；
（2）Impedance matching, impedance matching are carried out to main detection coil and matched coil using the impedance matching principle of dislocation adjustment After end, keep the horizontal range of matched coil and main detection coil constant, change the concentration of urea liquid successively；
（3）Respectively to carrying out data sampling in S11 parameters corresponding to different urea concentration solution, record sampled result and establish Database；
A. the aqueous solution of urea that mass concentration is 0% is added in urea for vehicle case, increase addition sampling quality concentration is every time 0.5% aqueous solution of urea is high for 66 groups of sampling solution altogether to the aqueous solution of urea that sample solution sampling quality concentration is 32.5% Degree；
B. module is occurred gradually by high-frequency signal to the sampling quality concentration of the 1st group to the 66th group of aqueous solution of urea respectively Change the frequency of matched coil output signal, be incremented to 90MHz from 30MHz, step-length 100KHz, pass through data acquisition and procession S11 parameters under module collection different frequency, and by the S11 Parameter Switch collected into corresponding magnitude of voltage, then pass through micro-control The A/D modular converters of device processed gather the magnitude of voltage, using S11 parameters and current solution concentration as one group of data, in units of group Recorded, obtain the 1st group to the 66th group sampled data, establish sampling database；
C. urea concentration monitoring to be measured：Urea liquid to be measured is put into urea box, urea in urea box is highly kept Urea when being sampled with one is highly consistent, gradually changes the frequency of matched coil output signal by high-frequency signal generation module Rate, 90MHz, step-length 100KHz are incremented to from 30MHz, are gathered afterwards by data acquisition and procession module under different frequency S11 parameters, using look-up method, by obtained data compared with the data in the database that step b is established, you can judge to be measured The concentration of urea liquid.
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CN205172704U (en) * 2015-11-21 2016-04-20 吉林大学 Car SCR urea solution of system concentration and high on -line monitoring appearance

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CN104792828A (en) * 2015-04-20 2015-07-22 吉林大学 Online diesel exhaust fluid solution concentration monitoring system and monitoring method for automobile SCR system
CN205172704U (en) * 2015-11-21 2016-04-20 吉林大学 Car SCR urea solution of system concentration and high on -line monitoring appearance

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