CN106499489A - A kind of diesel particulate trap carbon loading amount detecting device and detection method - Google Patents

Abstract

The invention discloses a kind of diesel particulate trap carbon loading amount detecting device and detection method, device includes detection coil, power module, controller module, RF Amplifier Module and data acquisition module, the filter layer of wherein detection coil and DPF carriers is placed in parallel and is placed between the DPF carrier encapsulations layer of DPF carrier bases and DPF carrier bodies, detection coil is also connected with data acquisition module, RF Amplifier Module, and power module is connected with data acquisition module, RF Amplifier Module and controller module and provides electric power to them.Detection method is：1st, collection voltages amplitude a1 and voltage magnitude b1；2nd, the radiofrequency signal for receiving is conveyed to data acquisition module by detection coil；3rd, obtain | S₁₁|；4th, data base is formed；5th, on-line checking is completed；6th, regeneration to DPF carrier is completed.Beneficial effect：While having, detection means is simple, speed is fast, high precision, reliable operation.

Description

A kind of diesel particulate trap carbon loading amount detecting device and detection method

Technical field

The present invention relates to a kind of carbon loading amount detecting device and detection method, more particularly to a kind of diesel particulate trap Carbon loading amount detecting device and detection method.

Background technology

Currently, as China's automobile pollution is improved constantly, automobile exhaust emission standard is more and more stricter.Due to diesel engine The advantages of saving fuel, long service life, Hyundai Motor are switched to more and more brighter by diesel-driven trend by gasoline engine driving Aobvious, the development of diesel engines at present has become the important development direction of automobile industry.Diesel engine vent gas mainly include carbon monoxide (CO), Hydrocarbon (HC), oxynitride (NOx), soot (PM) etc..Wherein, the soot that diesel emission goes out needs profit Could be removed with diesel particulate trap (DPF).Diesel engine DPF is in a kind of exhaust system installed in diesel engine Filter, is made up of the cellular ceramic monolith made of carborundum, when waste gas flows through DPF carriers, the granule in waste gas Can just be trapped, the device can reduce the soot of electromotor generation up to more than 90%.

After diesel engine DPF work a period of times, the carbon soot particles being trapped gradually increase, and can cause diesel engine back pressure liter Height, causes diesel engine performance to decline.Diesel exhaust gas is affected to prevent DPF to be blocked, it is necessary to periodically to micro particle catching The particulate matter that device is trapped is processed, i.e. the regeneration of DPF.

Therefore, in diesel engine particles trapping system, the detection of catalyst condition in DPF is served to the control of the system Crucial effect.Carbon loading capacity (Soot loading) in catalyst condition is exactly a critically important parameter.

At present, for the measuring method of DPF carbon loading capacities is divided into：Calculating method and empirical method and synthetic method.

Calculating method is to carry out the method that is calculated DPF carbon loading capacities using related mathematics or physical equation.

Carbon loading capacity is obtained by obtaining PM outputs with the difference of PM Natural re generation amounts.Or the increment portion by carbon stocks It is divided into and is changed by the carbon deposition quantity that the change of total flow resistance causes, changed and by exhaust gas volume stream by the carbon deposition quantity that ash quality causes The carbon deposition quantity that amount causes changes three parts, is calculated using correlation formula, you can obtain carbon stocks.

Exhaust gas flow in empirical method pressure difference by determining DPF two ends main to the judgement of carbon loading capacity, exhaustor, The parameters such as the temperature of DPF and curve or the MAP of the relation formation of carbon loading capacity, then look into chart to determine real-time carbon loading Amount.

Specific implementation process can draw DPF carbon loading capacity estimated values by consulting pressure difference with the corresponding table of carbon loading capacity And precision is improved by parameters revisions such as gas flow temperatures；The loading of electromotor DPF carbon is demarcated using universal characteristic curve of engine Amount；Exhaust gas flow (temperature of DPF) in pressure reduction and exhaustor based on DPF two ends demarcates ash amount MAP；Using sky Carry state equation and determine standard differential pressure calibration curve of standard pressure reduction and carbon accumulation amount etc..

Synthetic method, i.e. synthetic empirical approach and computational methods, are examined to DPF carbon loading capacities simultaneously by both approaches Survey, and mutually calibrated using both data, obtain more accurate DPF carbon loading capacity data.

Such as set up DPF pressure reduction models and obtain the first carbon loading capacity, then by calculating the second carbon to PM outputs and amount of regeneration Loading capacity, retains the higher carbon carrying capacity data of accuracy.Or by driving cycle and the MAP of loading carbon granule speed, obtain Second carbon carrying capacity, both modes are combined carries out comprehensive descision to carbon carrying capacity.

Obtained based on the methods such as pressure reduction, exhaust gas flow, PM outputs and amount of regeneration and their integrated approach above Need during carbon loading capacity using substantial amounts of sensor, relatively costly, its levels of precision is often depending on sensor accuracy With the accuracy of computation model, there is larger error under some operating modes, accurately can not estimate under special extreme case Carbon loading capacity in DPF, directly affects the dpf regeneration moment.

Carbon loading capacity inside DPF can accurately be obtained by relatively low cost if using optical method and electromagnetic method. Such as scattering of light effect can also be detected to DPF carbon loading capacities using PM granules.Or DPF carbon is added by radio-frequency technique Carrying capacity is detected.

Carbon loading capacity using diesel engine DPF is different, and the different principle of its resonant frequency directly can be measured in DPF Carbon loading capacity size and the data without relying on other sensors.The electromagnetic property situation of change measured using this method is Ceramic honeycomb filtration body, coating and some other metallic catalysts etc. in DPF are measured as an entirety, with speed Hurry up, certainty of measurement is higher, strong antijamming capability, the advantages of simple to operate, result is accurate, and the mechanical noise of electromotor is to penetrating Keep pouring in and broadcast, receive without impact.

In a kind of patent " method and apparatus for realizing DPF accurate reproductions based on a radio-frequency technique detection carbon accumulation amount " text (application number：201610309409.0), it is proposed that a kind of corresponding relation based on RF resonant frequencies and carbon accumulation amount is carried out in real time The method of the measurement of carbon accumulation amount in DPF filtering bodies.The system is by being placed on DPF upstream and downstream for the detection of resonant frequency RF generators, RF receptors, radiated radio frequency (RF) signal, the radiofrequency signal for receiving DPF transmissions are completed.In the selection of device and On DPF with aerial position relation, the invention is used to be placed radio-frequency transmissions, receives two kinds of dresses respectively in DPF upstream and downstream Put, structure is more complicated；The invention is adopted in the processing procedure to radiofrequency signal, and the invention is using the radiofrequency signal to transmission Carry out Fourier transformation and obtain the method for energy spectrum curve maximum point completing the demarcation to resonant frequency.

Content of the invention

The invention aims to all present in the detection means and detection method of the existing DPF carbon loading capacity of solution Many problems, and a kind of diesel particulate trap carbon for providing loads amount detecting device and detection method.

The present invention provide diesel particulate trap carbon loading amount detecting device include detection coil, power module, Controller module, RF Amplifier Module and data acquisition module, wherein detection coil are placed in parallel simultaneously with the filter layer of DPF carriers It is placed between the DPF carrier encapsulations layer of DPF carrier bases and DPF carrier bodies, detection coil is periodically launched from one Radio frequency of the frequency to another frequency, radio frequency are received by original detection coil after reflection again in DPF carrier insides, Detection coil is also connected with data acquisition module, RF Amplifier Module, data acquisition module and RF Amplifier Module with control Device module processed is connected and controls work, power module and data acquisition module, RF Amplifier Module and control by controller module Device module processed is connected and provides electric power to them.

Data acquisition module is mainly made up of coil, communication chip and storage chip, for receiving the radio frequency for reflecting Signal, and the radiofrequency signal for receiving is sent to the main control chip in controller module carries out calculating analysis to carry out next step Control.

RF Amplifier Module is mainly made up of radio-frequency signal generator, power amplifier and coil, and RF Amplifier Module is by controlling Main control chip control work in device module, for producing the radiofrequency signal of the different frequency to the transmitting of DPF carriers, radio frequency occurs Device is powered by power supply, and the electric energy of direct current is switched to electromagnetic energy, in its internal excitation electromagnetic oscillation, so as in the corresponding time period The interior radiofrequency signal for producing corresponding frequencies, and the detection coil for being placed on DPF carrier bases is transferred to, will be penetrated by detection coil Frequency signal radiate.

Controller module is mainly made up of main control chip, communication chip and several interfaces, for radiofrequency signal control, letter Number process, carbon loading capacity is estimated and ECU device talks, main control chip sends drive signal, controls RF Amplifier Module, by counting The radiofrequency signal being reflected back being collected according to acquisition module, and sending back controller module, controller module is calculated after receiving and compared Show that the current carbon loading capacity of DPF carrier insides, the interface that controller module is arranged are connected and lead to the ECU equipment in electromotor News.

Detection coil, power module, controller module, RF Amplifier Module, data acquisition module and ECU equipment are existing There is the assembling of equipment, therefore, concrete model and specification are not further repeated.

The diesel particulate trap carbon loading quantity measuring method that the present invention is provided, its step are as follows：

, when DPF carriers are under same carbon loading capacity, different frequency, collection DPF carriers are sent out in same port for step one, record The voltage magnitude b1 that the voltage magnitude a1 and the reflected radio-frequency signal for receiving that the radiofrequency signal of injection causes causes；

The radiofrequency signal for receiving is conveyed to data acquisition module by step 2, detection coil, and data acquisition module is by number Calculated according to the main control chip being sent to by communication unit in controller module, be shown below：

Wherein, as detection coil is only positioned over the bottom of DPF carriers, work as a₂When=0,

|S₁₁| for return loss, unit is dB, | S₁₁| can change with the change of intra resonant cavity parameter, describe The situation that energy is transmitted in resonance intracavity, so that reflect the situation of change of DPF carrier inside carbon loading capacities；

Step 3, under same DPF carbon loading capacity state, obtain frequency for 500MHz to 2500MHz, step-length 100KHz Under different frequency | S₁₁|, when | S₁₁| when taking minima its corresponding frequency be resonator cavity occur resonance when frequency, due to |S₁₁| have one-to-one relation with resonant frequency, adopt | S₁₁| to demarcate resonant frequency, under same carbon loading capacity, when | S₁₁ | resonant frequency now is calculated when reaching minima, when in DPF carriers, carbon loading capacity is different, | S₁₁| obtain minima when pair The resonant frequency that answers is different, thus the numerical value of each resonant frequency is corresponding to the different carbon loading of DPF carrier insides Amount state；

Step 4, under 500MHz to 2500MHz, the different frequency of step-length 100KHz, set up different carbon loading capacities with humorous Corresponding relation between vibration frequency, and form data base and write main control chip；

Step 5, by said apparatus load diesel engine post-processing system in, when electromotor start working after, radio frequency amplify Module produces swept-frequency signal, and the radiofrequency signal data that main control chip is collected obtain a frequency sweep cycle after calculating Interior minimum RL return loss | S₁₁| numerical value simultaneously calculates the RL return loss for producing minimum | S₁₁| the resonance frequency at this moment of numerical value Rate, which is mated with the resonant frequency data in data base, draws real-time carbon loading capacity, is completed to DPF carbon loading capacities On-line checking；

Step 6, when DPF carrier insides carry carbon amounts reach preset value when, controller module is to the ECU equipment in electromotor Regenerated signal is sent, and the regeneration to DPF carriers is completed under the control of Engine ECU equipment.

The operation principle of the present invention：

In the selection of device, the present invention is only disposed at DPF carriers one for launching and receive the detection of radiofrequency signal Coil, detects resonant frequency by radiofrequency signal that DPF carriers are reflected, thus transmitting and can receive the circuit of signal Integrated be positioned at one, simplify structure of the detecting device, easily operate.On position relationship of the DPF carriers with detection coil, will inspection Test coil is placed in parallel with DPF carrier filter layers and is placed in DPF carrier bases, i.e., between DPF carrier encapsulations layer and DPF carriers. As DPF carrier encapsulations are metal material, detection coil are arranged between metal material and DPF carriers and can guarantee that detection coil Do not affected by external interference, improved certainty of measurement.Cannot screen layer be set if detection coil is arranged in the direction of the air flow, with When waste gas in carbon soot particles can be deposited on the coil of DPF upstreams, affect certainty of measurement.At to radiofrequency signal During reason, detection coil transmitting radiofrequency signal is used while receiving the radiofrequency signal being reflected back, through being calculated echo damage Consumption | S₁₁| parameter, and find the method for its minimum respective resonant frequencies and complete the demarcation to resonant frequency.

Beneficial effects of the present invention：

A kind of diesel particulate trap carbon loading amount detecting device and detection method that the present invention is provided is to utilize radio frequency The process for capturing carbon soot particles in the DPF carrier courses of work is converted into technology the numerical quantities that can be observed.By damaging to echo Consumption | S₁₁| in the different records for carrying minima under carbon amounts, calculate and work as | S₁₁| corresponding frequency when obtaining minima, as now The resonant frequency of DPF carriers, sets up the Test database of DPF carriers resonant frequency and carbon loading capacity.By in real-time DPF carriers Portion's radiofrequency signal sends back the main control chip of controller module and obtains return loss numerical value | S₁₁|, it is calculated a frequency sweep cycle Interior | S₁₁| corresponding resonant frequency when obtaining minima, and by resonant frequency numerical value in calculated resonant frequency and data base It is compared, obtains real-time DPF carrier insides carbon loading capacity, complete the detection to DPF carrier inside catalyst conditions, so as to In regenerating to DPF carriers.

The method detected using radio frequency completes to be a kind of contactless detection to the detection of DPF carrier inside carbon loading capacities Method, to work in the interference of DPF carriers little, while have that detection means is simple, speed fast, high precision, reliable operation etc. excellent Point.

Description of the drawings

Fig. 1 is apparatus structure schematic diagram of the present invention.

Fig. 2 is detection coil schematic view of the mounting position of the present invention.

Fig. 3 is | S₁₁| detection spectrum diagram.

1st, detection coil 2, power module 3, controller module 4, RF Amplifier Module

5th, data acquisition module 6, DPF carriers 7, encapsulated layer 8, ECU equipment.

Specific embodiment

Refer to shown in Fig. 1, Fig. 2 and Fig. 3：

The diesel particulate trap carbon loading amount detecting device that the present invention is provided includes detection coil 1, power module 2nd, controller module 3, RF Amplifier Module 4 and data acquisition module 5, wherein detection coil 1 are flat with the filter layer of DPF carriers 6 Row is placed and is placed between the encapsulated layer 7 of DPF carriers 6 of 6 bottom of DPF carriers and the body of DPF carriers 6,1 cycle of detection coil Property launch radio frequency from a frequency to another frequency, radio frequency is former again after reflection inside DPF carriers 6 The detection coil 1 that comes is received, and detection coil 1 is also connected with data acquisition module 5, RF Amplifier Module 4, data acquisition module 5 are connected with controller module 3 with RF Amplifier Module 4 and control work, power module 2 and data by controller module 3 Acquisition module 5, RF Amplifier Module 4 are connected with controller module 3 and provide electric power to them.

Data acquisition module 5 is mainly made up of coil, communication chip and storage chip, for receiving the radio frequency for reflecting Signal, and by the radiofrequency signal for receiving be sent to the main control chip in controller module 3 carry out calculate analysis next to carry out The control of step.

RF Amplifier Module 4 is mainly made up of radio-frequency signal generator, power amplifier and coil, and RF Amplifier Module 4 is by controlling Main control chip control work in device module 3 processed, for producing the radiofrequency signal of the different frequency to the transmitting of DPF carriers 6, radio frequency Generator is powered by power supply, and the electric energy of direct current is switched to electromagnetic energy, in its internal excitation electromagnetic oscillation, so as to when corresponding Between produce the radiofrequency signal of corresponding frequencies in section, be transferred to the detection coil 1 for being placed on 6 bottom of DPF carriers, by detection coil Radiofrequency signal is radiate by 1.

Controller module 3 is mainly made up of main control chip, communication chip and several interfaces, for radiofrequency signal control, Signal processing, carbon loading capacity are estimated and ECU equipment 8 is communicated, and main control chip sends drive signal, control RF Amplifier Module 4, The radiofrequency signal being reflected back being collected by data acquisition module 5, and sending back controller module 3, controller module 3 is counted after receiving Calculate to compare and draw current carbon loading capacity inside DPF carriers 6, controller module 3 is additionally provided with interface and is set with the ECU in electromotor Standby 8 are connected and communicate.

Detection coil 1, power module 2, controller module 3, RF Amplifier Module 4, data acquisition module 5 and ECU equipment 8 The assembling of existing equipment is, therefore, concrete model and specification are not further repeated.

The diesel particulate trap carbon loading quantity measuring method that the present invention is provided, its step are as follows：

, when DPF carriers 6 are under same carbon loading capacity, different frequency, collection DPF carriers 6 are in same port for step one, record The voltage magnitude b1 that the voltage magnitude a1 and the reflected radio-frequency signal for receiving that the radiofrequency signal that launches causes causes；

The radiofrequency signal for receiving is conveyed to data acquisition module 5 by step 2, detection coil 1, and data acquisition module 5 will Data are calculated by the main control chip that communication unit is sent in controller module 3, are shown below：

Wherein, as detection coil 1 is only positioned over the bottom of DPF carriers 6, work as a₂When=0,

|S₁₁| for return loss, unit is dB, | S₁₁| can change with the change of intra resonant cavity parameter, describe The situation that energy is transmitted in resonance intracavity, so that reflect the situation of change of 6 inside carbon loading capacity of DPF carriers；

Step 3, under 6 carbon loading capacity state of same DPF carriers, obtain frequency for 500MHz to 2500MHz, step-length Under the different frequency of 100KHz | S₁₁|, when | S₁₁| when taking minima its corresponding frequency be resonator cavity occur resonance when Frequency, due to | S₁₁| have one-to-one relation with resonant frequency, adopt | S₁₁| to demarcate resonant frequency, load in same carbon Under amount, when | S₁₁| resonant frequency now is calculated when reaching minima, when in DPF carriers 6, carbon loading capacity is different, | S₁₁| take Obtain corresponding resonant frequency during minima different, thus the numerical value of each resonant frequency is corresponding to inside DPF carriers 6 Different carbon loading capacity states；

Step 4, under 500MHz to 2500MHz, the different frequency of step-length 100KHz, set up different carbon loading capacities with humorous Corresponding relation between vibration frequency, and form data base and write main control chip；

Step 5, by said apparatus load diesel engine post-processing system in, when electromotor start working after, radio frequency amplify Module produces swept-frequency signal, and the radiofrequency signal data that main control chip is collected obtain a frequency sweep cycle after calculating Interior minimum RL return loss | S₁₁| numerical value simultaneously calculates the RL return loss for producing minimum | S₁₁| the resonance frequency at this moment of numerical value Rate, which is mated with the resonant frequency data in data base, draws real-time carbon loading capacity, completes to add 6 carbon of DPF carriers The on-line checking of carrying capacity；

Step 6, when carrying carbon amounts inside the DPF carriers 6 and reaching preset value, controller module 3 is set to the ECU in electromotor Standby 8 send regenerated signal, complete the regeneration to DPF carriers 6 under the control of Engine ECU equipment 8.

Claims (5)

1. a kind of diesel particulate trap carbon loads amount detecting device, it is characterised in that：Include detection coil, power supply mould Block, controller module, RF Amplifier Module and data acquisition module, wherein detection coil are parallel with the filter layer of DPF carriers to be put Put and be placed between the DPF carrier encapsulations layer of DPF carrier bases and DPF carrier bodies, detection coil periodically launch from Radio frequency of one frequency to another frequency, radio frequency DPF carrier insides through reflection after again by original detection coil Receive, detection coil is also connected with data acquisition module, RF Amplifier Module, and data acquisition module and RF Amplifier Module are equal It is connected with controller module and work, power module and data acquisition module, RF Amplifier Module is controlled by controller module Be connected with controller module and electric power is provided to them.

2. a kind of diesel particulate trap carbon according to claim 1 loads amount detecting device, it is characterised in that：Described Data acquisition module be mainly made up of coil, communication chip and storage chip, for receiving the radiofrequency signal that reflects, and The radiofrequency signal for receiving is sent to the main control chip in controller module carries out calculating control of the analysis to carry out next step.

3. a kind of diesel particulate trap carbon according to claim 1 loads amount detecting device, it is characterised in that：Described RF Amplifier Module be mainly made up of radio-frequency signal generator, power amplifier and coil, RF Amplifier Module is by controller module In main control chip control work, for produce to DPF carriers transmitting different frequency radiofrequency signal, radio-frequency signal generator rely on Power supply is powered, and the electric energy of direct current is switched to electromagnetic energy, in its internal excitation electromagnetic oscillation, so as to produce within the corresponding time period Radiofrequency signal is radiate by the radiofrequency signal of corresponding frequencies by detection coil.

4. a kind of diesel particulate trap carbon according to claim 1 loads amount detecting device, it is characterised in that：Described Controller module be mainly made up of main control chip, communication chip and several interfaces, at radiofrequency signal control, signal Reason, carbon loading capacity estimate and with ECU device talks, main control chip sends drive signal, controls RF Amplifier Module, by data Acquisition module collects the radiofrequency signal being reflected back, and sends back controller module, and controller module is calculated after receiving and compared Go out the current carbon loading capacity of DPF carrier insides, the interface that controller module is arranged is connected and leads to the ECU equipment in electromotor News.

5. a kind of diesel particulate trap carbon loads quantity measuring method, it is characterised in that：Its step is as follows：

, when DPF carriers are under same carbon loading capacity, different frequency, collection DPF carriers are launched in same port for step one, record The voltage magnitude a1 that causes of radiofrequency signal and the voltage magnitude b1 that causes of the reflected radio-frequency signal for receiving；

The radiofrequency signal for receiving is conveyed to data acquisition module by step 2, detection coil, and data are led to by data acquisition module Cross the main control chip that communication unit is sent in controller module to be calculated, be shown below：

$\left(\begin{array}{c}{b}_1\\ b_2\end{array}\right)=S\left(f\right)\·\left(\begin{array}{c}{a}_1\\ a_2\end{array}\right)=\left(\begin{array}{cc}{S}_{11}\left(f\right)& S_{12}\left(f\right)\\ S_{21}\left(f\right)& S_{22}\left(f\right)\end{array}\right)\·\left(\begin{array}{c}{a}_1\\ a_2\end{array}\right)$

Wherein, as detection coil is only positioned over the bottom of DPF carriers, work as a₂When=0,

$S_{11}{|}_{a_2=0}=20\lg \left(\frac{b_1}{a_1}\right)$

|S₁₁| for return loss, unit is dB, | S₁₁| can change with the change of intra resonant cavity parameter, describe energy and exist The situation of resonance intracavity transmission, so that reflect the situation of change of DPF carrier inside carbon loading capacities；

Step 3, under same DPF carrier carbons loading capacity state, obtain frequency for 500MHz to 2500MHz, step-length 100KHz Under different frequency | S₁₁|, when | S₁₁| when taking minima its corresponding frequency be resonator cavity occur resonance when frequency, due to |S₁₁| have one-to-one relation with resonant frequency, adopt | S₁₁| to demarcate resonant frequency, under same carbon loading capacity, when | S₁₁ | resonant frequency now is calculated when reaching minima, when in DPF carriers, carbon loading capacity is different, | S₁₁| obtain minima when pair The resonant frequency that answers is different, thus the numerical value of each resonant frequency is corresponding to the different carbon loading of DPF carrier insides Amount state；

Step 4, under 500MHz to 2500MHz, the different frequency of step-length 100KHz, set up different carbon loading capacities with resonance frequency Corresponding relation between rate, and form data base and write main control chip；

Step 5, by said apparatus load diesel engine post-processing system in, when electromotor start working after, RF Amplifier Module Swept-frequency signal is produced, the radiofrequency signal data that main control chip is collected are obtained in a frequency sweep cycle after calculating most Little RL return loss | S₁₁| numerical value simultaneously calculates the RL return loss for producing minimum | S₁₁| the resonant frequency at this moment of numerical value, will Which is mated with the resonant frequency data in data base, draws real-time carbon loading capacity, is completed to DPF carrier carbon loading capacities On-line checking；

Step 6, when DPF carrier insides carry carbon amounts reach preset value when, controller module in electromotor ECU equipment send Regenerated signal, completes the regeneration to DPF carriers under the control of Engine ECU equipment.