CN101245727A - Control method and control device for controlling input amount in diesel engine SCR system - Google Patents
Control method and control device for controlling input amount in diesel engine SCR system Download PDFInfo
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- CN101245727A CN101245727A CNA2008100471146A CN200810047114A CN101245727A CN 101245727 A CN101245727 A CN 101245727A CN A2008100471146 A CNA2008100471146 A CN A2008100471146A CN 200810047114 A CN200810047114 A CN 200810047114A CN 101245727 A CN101245727 A CN 101245727A
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Abstract
The invention provides a control method and a control device for controlling the releasing amount of adding blue used in a diesel engine SCP system which is respectively divided by the rotary speed and load according to the step length to acquire the two-dimension gridding with the rotary speed and load. A gridding unit is taken as a working situation control point; rotary speed, torque, air inlet flow, temperature drain, NOX concentration and oil consumption corresponding to the two-dimension gridding in step one are generated by interpolation treatment according to the rotary speed, the torque, the air inlet flow, the temperature drain, the NOX concentration and the oil consumption in universal characteristic data, namely the universal characteristic of matrix type. The corresponding NOX transformation rate is further acquired by acquiring the temperature drain and waste gas flow under the corresponding working situation control point through the universal characteristic of matrix type. The releasing amount of adding blue is acquired through the corresponding NOX transformation rate and the NOX concentration to generate the three-dimension matrix of the rotary speed, the torque and the releasing amount of adding blue of the diesel engine. The three-dimension matrix is inquired by real time acquiring the two parameters of the rotary speed and torque of the diesel engine to acquire the releasing amount of adding blue corresponding to the working situation and apply releasing amount control.
Description
Technical field
The controlling method and the control gear of blue injected volume added in the control that the present invention relates to use in a kind of SCR system of diesel engine, belonging to the diesel engineering technical field, is to add blue flow control method in a kind of SCR system of diesel engine and add the blue control gear of throwing in accordingly specifically.
Background technique
Energy-conservation and environmental protection is two important themes in the industrial technology field of the China and the world today.At present, in order to improve combustion efficiency, the optimisation technique of diesel combustion cell structure has performed to ultimate attainment.But because of correspondingly the raise NO of diesel engine of burning optimization
XDischarging.
China has formulated corresponding regulations for the emission standard of diesel engine.In order to satisfy the requirement of rules, must take the otherwise effective technique measure, reduce the NO of diesel engine
XDischarging.According to the present state of the art, require diesel engine to reach (the IV stage and the V stages of rules and regulations) emission standard, can only rely on the outer reprocessing of machine to be assisted.For China's actual conditions, generally believe that China's large diesel engine realizes that the best-of-breed technology route of IV stage criterion is, pass through optimized combustion, improve combustion efficiency and make the granular material discharged laws and regulations requirement that reaches, use selective catalytic reduction (Selective Catalytic Reduction) technology then, reduce the NO that raises because of burning optimization
XThe what is called " SCR scheme " that the SCR system carries out reprocessing is promptly installed in discharging.
The know-why of SCR scheme is, according to the operating conditions of diesel engine, throws in an amount of indigo plant (Adblue) solution that adds at air outlet flue, itself and NO
XCarry out reduction reaction, realize reducing NO
XThe purpose of discharging.Therefore, add the controlling method of blue injected volume, and the online diesel engine operating conditions parameter of obtaining is the key technology of SCR system to implement the method for injected volume control.
Summary of the invention
The objective of the invention is to design controlling method and the control gear that blue injected volume is added in the control of using in a kind of SCR system of diesel engine, generate rotating speed, the torque of this diesel engine and add the three-dimensional matrice of blue injected volume, with the online diesel engine real time execution duty parameter that obtains, added blue injected volume in real time by the inquiry three-dimensional matrice, to implement injected volume control.
Technological scheme of the present invention: the controlling method of blue injected volume is added in the control of using in the SCR system of diesel engine of the present invention, the steps include:
The first step: divide by step-length by rotating speed and load respectively, obtain the two-dimensional grid of rotating speed and load, with grid cell [bin as the operating mode control point;
Second step: according to the rotating speed in the mapping characteristics data, torque, charge flow rate, row's temperature, NO
XConcentration and fuel consumption data generate rotating speed, torque, charge flow rate, row temperature, the NO corresponding with two-dimensional grid in the step 1 by interpolation processing
XThe mapping characteristics of representing with matrix form of concentration and oil consumption;
The 3rd step: the mapping characteristics of representing with matrix form by second step obtains the gentle exhaust gas flow of row on the corresponding operating mode control point, and then obtains corresponding NO
XConversion ratio;
The 4th step: by the NO of correspondence
XConversion ratio and NO
XConcentration obtains adding blue injected volume, generates rotating speed, the torque of this diesel engine and adds the three-dimensional matrice of blue injected volume;
The 5th step: obtain diesel engine speed, two parameters of torque in real time, by the three-dimensional matrice inquiry in the 4th step to should working condition down add blue injected volume, implement injected volume and control.
The controlling method of blue injected volume is added in the control of using in the described SCR system of diesel engine, and the step-length of first step medium speed and load is divided and is: rotating speed to be being that step-length is divided smaller or equal to 200 commentariess on classics/per minutes, and load is being the step-length division smaller or equal to 20%.
A kind of control gear of realizing said method comprises single-chip microcomputer and peripheral circuit, and control gear is provided with the CAN EBI, and single-chip microcomputer is accepted the data that motor hand is made state by the CAN bus of electronic Control for Diesel Engine device ECU; Rotating speed, the torque of this diesel engine of storage and add the three-dimensional matrice of blue injected volume in the storage.
The rotating speed of storage, torque and the three-dimensional matrice that adds blue injected volume are to be step-length with rotating speed smaller or equal to 200 commentaries on classics/per minutes in the described control gear, and load is be that the two-dimensional grid of the rotating speed that obtains of step-length division and load is a benchmark smaller or equal to 20%.
Superiority of the present invention is:
(1) a kind of controlling method based on mapping characteristics and conversion ratio characteristic is proposed.This method is that the mapping characteristics by diesel engine sets up with rotating speed, torque is the control point of coordinate, and will add the function that blue flow is expressed as rotating speed, torque.Therefore, the diesel engine condition control point only need be judged simply by obtaining diesel engine speed and torque by the SCR system, and blue flow is added in control, with NO
XIn the scope that is controlled at laws and regulations requirement of discharging.
(2) a kind of feasible implementation is proposed.This mode be design with the single-chip microcomputer be main body constitute with electronic Control for Diesel Engine device (ECU) control gear independently, device is accepted the data that motor hand is made state by the CAN bus of electronic Control for Diesel Engine device (ECU), obtains rotating speed and torque parameter.Add blue flow by single-chip microcomputer according to diesel engine speed and torque control.This mode makes that not only obtaining of duty parameter is simple, and main is this independently mode, can not change original design of diesel engine control system, directly disposes the SCR system.
Description of drawings
Fig. 1 is a controlling method principle logic diagram of the present invention.
Fig. 2 is a control gear structure principle chart of the present invention.
Embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing.
As Fig. 1: the basic point of controlling method of the present invention is: with the mapping characteristics and the NO of diesel engine
XThe conversion ratio characteristic is as known conditions.The steps include:
The first step: divide by step-length by rotating speed and load respectively, obtain the two-dimensional grid of rotating speed and load, with grid cell [bin as the operating mode control point;
Second step: according to the rotating speed in the mapping characteristics data, torque, charge flow rate, row's temperature, NO
XConcentration and fuel consumption data generate rotating speed, torque, charge flow rate, row temperature, the NO corresponding with two-dimensional grid in the step 1 by interpolation processing
XConcentration and oil consumption, promptly matrix form represent mapping characteristics;
The 3rd step: the mapping characteristics of matrix form by second step obtains the gentle exhaust gas flow of row on the corresponding operating mode control point, and then obtains corresponding NO
XConversion ratio;
The 4th step: by the NO of correspondence
XConversion ratio and NO
XConcentration amounts obtains adding blue injected volume, generates rotating speed, the torque of this diesel engine and adds the three-dimensional matrice of blue injected volume;
The 5th step: obtain diesel engine speed, two parameters of torque in real time, by the three-dimensional matrice inquiry in the 4th step to should working condition down add blue injected volume, implement injected volume and control.
The step-length of described rotating speed and load is divided: rotating speed to be being that step-length is divided smaller or equal to 200 commentariess on classics/per minutes, and load is being the step-length division smaller or equal to 20%.
Fig. 2 is a control gear structure principle chart of the present invention:
Device comprises single-chip microcomputer and peripheral circuit, comprises single-chip microcomputer fundamental system, outside extended menory, CAN EBI, the input interface of switching value, analog amount, switching value, analog output interface circuit.
Single-chip microcomputer is accepted the data that motor hand is made state by the CAN bus of electronic Control for Diesel Engine device (ECU); Rotating speed, the torque of this diesel engine of storage and add the three-dimensional matrice of blue injected volume in the storage.This three-dimensional matrice is to be step-length with rotating speed smaller or equal to 200 commentaries on classics/per minutes, and load is be that the two-dimensional grid of the rotating speed that obtains of step-length division and load is a benchmark smaller or equal to 20%.
Single-chip microcomputer obtains diesel engine speed, dtc signal, by rotating speed, torque with add blue traffic matrix, obtains and adds blue emitted dose, exports control signal corresponding then, and control dosing unit sprays in Diesel Engine Exhaust Pipe and adds indigo plant.The major function of CAN bus is transmission rotating speed and the dtc signal that receives electronic Control for Diesel Engine device (ECU); Other has the sensor of CAN interface or the data of instrument simultaneously also can to accept diesel engine system; Can add blue injected volume control signal to actuator's transmission of band CAN interface by the CAN bus, and send the state video data to instrument with CAN interface.
For the sensor that does not have the CAN bus, final controlling element is Displaying Meter, and single-chip microcomputer can be by the input interface of switching value and analog amount, monitoring CSR system running state, and by corresponding status information of the output interface of switching value and analog amount or alarm signal.
The analog amount input interface mainly gathers catalyst converter entrance and exit temperature, add blue jar liquid level and add analogue signal such as blue temperature.Analog output interface circuit exports mainly that to add blue liquid level index signal be status alert tutorial light etc.
The function of switching value input/output interface is to gather the key operation signal, output Single-chip Controlling antifreeze liquid solenoid valve switching signal; For utilizing the blue actuator of throwing in of adding of switching value or pulse frequency control, then single-chip microcomputer can utilize PWM interface output control signal.
Its memory cell is divided into program storage and data storage, and data storage is deposited rotating speed, torque and added blue traffic matrix.
According to the method for proposition of the present invention, control gear should be provided with the CAN EBI, accepts the diesel engine work status parameter (rotating speed, torque, cooling water temperature etc.) that electronic Control for Diesel Engine device (ECU) provides by the CAN bus.Like this, can make system architecture simple (not needing to install rotating speed, temperature etc. and the relevant sensor of diesel engine work state).For delivery device with CAN interface, also can be by CAN bus output control command.
According to the method for proposition of the present invention, control gear hardware configuration and system program can be independently and electronic Control for Diesel Engine device (ECU).Like this for ripe diesel engine product, under the prerequisite that does not change original structure, direct supporting installation SCR system becomes possibility.
This device is independent of electronic Control for Diesel Engine device (ECU), its function is: the data (rotating speed of diesel engine and torque) that provide by the CAN bus from ECU are provided, then according to being solidificated in its inner rotating speed, torque, adding blue traffic matrix, search according to the operating conditions (rotating speed, torque) of diesel engine and to add blue flow, add blue injected volume by control executing mechanism control, with NO
XIn the scope that is controlled at laws and regulations requirement of discharging.
According to the method for proposition of the present invention, also can be directly used in the electronic Control for Diesel Engine device (ECU).
Core of the present invention is by rotating speed and torque the operating mode of diesel engine to be divided into limited grid, utilizes the mapping characteristics and the NO of diesel engine
XThe conversion ratio characteristic obtains rotating speed, the torque of this diesel engine and adds the three-dimensional matrice of blue injected volume by approach based on linear interpolation, is added blue injected volume in real time by the inquiry three-dimensional matrice.
Claims (4)
1. the control of using in the SCR system of diesel engine controlling method of adding blue injected volume the steps include:
The first step: divide by step-length by rotating speed and load respectively, obtain the two-dimensional grid of rotating speed and load, with grid cell [bin as the operating mode control point;
Second step: according to the rotating speed in the mapping characteristics data, torque, charge flow rate, row's temperature, NO
XConcentration and fuel consumption data generate rotating speed, torque, charge flow rate, row temperature, the NO corresponding with two-dimensional grid in the step 1 by interpolation processing
XThe mapping characteristics of representing with matrix form of concentration and oil consumption;
The 3rd step: the mapping characteristics of representing with matrix form by second step obtains the gentle exhaust gas flow of row on the corresponding operating mode control point, and then obtains corresponding NO
XConversion ratio;
The 4th step: by the NO of correspondence
XConversion ratio and NO
XConcentration obtains adding blue injected volume, generates rotating speed, the torque of this diesel engine and adds the three-dimensional matrice of blue injected volume;
The 5th step: obtain diesel engine speed, two parameters of torque in real time, by the three-dimensional matrice inquiry in the 4th step to should working condition down add blue injected volume, implement injected volume and control.
2. the controlling method that blue injected volume is added in the control of using in the SCR system of diesel engine according to claim 1, it is characterized in that: the step-length of first step medium speed and load is divided and is: rotating speed to be being that step-length is divided smaller or equal to 200 commentariess on classics/per minutes, and load is being the step-length division smaller or equal to 20%.
3. control gear of realizing claim 1 or 2 methods, device comprises single-chip microcomputer and peripheral circuit, it is characterized in that: control gear is provided with the CAN EBI, and single-chip microcomputer is accepted the data that motor hand is made state by the CAN bus of electronic Control for Diesel Engine device ECU; Rotating speed, the torque of this diesel engine of storage and add the three-dimensional matrice of blue injected volume in the storage.
4. control gear according to claim 3, it is characterized in that: rotating speed, torque and the three-dimensional matrice that adds blue injected volume are to be step-length with rotating speed smaller or equal to 200 commentaries on classics/per minutes, and load is be that the two-dimensional grid of the rotating speed that obtains of step-length division and load is a benchmark smaller or equal to 20%.
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|---|---|---|---|
| CN2008100471146A CN101245727B (en) | 2008-03-20 | 2008-03-20 | Control method and control device for controlling input amount in diesel engine SCR system |
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|---|---|---|---|
| CN2008100471146A CN101245727B (en) | 2008-03-20 | 2008-03-20 | Control method and control device for controlling input amount in diesel engine SCR system |
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Cited By (5)
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| CN102230413A (en) * | 2011-05-20 | 2011-11-02 | 潍柴动力股份有限公司 | SCR (Selective Catalytic Reduction) control device, system and method thereof |
| CN102383902A (en) * | 2011-10-31 | 2012-03-21 | 武汉添蓝发动机排放控制技术有限公司 | Control and treatment method and system for emission of non-electric-control diesel engine |
| CN102619601A (en) * | 2012-04-18 | 2012-08-01 | 潍柴动力扬州柴油机有限责任公司 | SCR (Selective Catalytic Reduction) system of electrical control diesel engine and control method of SCR system |
| CN106121796A (en) * | 2016-08-23 | 2016-11-16 | 成都乾威科技有限公司 | A kind of method and device detecting emission from vehicles state up to standard |
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| FR2900063B1 (en) * | 2006-04-25 | 2009-04-17 | Nobel Plastiques Soc Par Actio | POLLUTION REDUCTION DEVICE FOR A MOTOR VEHICLE, MOTOR VEHICLE COMPRISING SUCH A DEVICE AND PIPE FOR TRANSPORTING A CORRESPONDING FLUID. |
| DE202006016391U1 (en) * | 2006-10-10 | 2007-02-22 | Lutz Pumpen Gmbh | Pumping mechanism for use in e.g. barrel pump, has discharge line pumping medium from container, and check valve attached to discharge and/or intake lines so that valve closes lines and temporarily releases lines based on delivery pressure |
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| CN102230413A (en) * | 2011-05-20 | 2011-11-02 | 潍柴动力股份有限公司 | SCR (Selective Catalytic Reduction) control device, system and method thereof |
| CN102383902A (en) * | 2011-10-31 | 2012-03-21 | 武汉添蓝发动机排放控制技术有限公司 | Control and treatment method and system for emission of non-electric-control diesel engine |
| CN102383902B (en) * | 2011-10-31 | 2013-05-01 | 武汉添蓝发动机排放控制技术有限公司 | Control and treatment method and system for emission of non-electric-control diesel engine |
| CN102619601A (en) * | 2012-04-18 | 2012-08-01 | 潍柴动力扬州柴油机有限责任公司 | SCR (Selective Catalytic Reduction) system of electrical control diesel engine and control method of SCR system |
| CN106121796A (en) * | 2016-08-23 | 2016-11-16 | 成都乾威科技有限公司 | A kind of method and device detecting emission from vehicles state up to standard |
| CN106682428A (en) * | 2016-12-29 | 2017-05-17 | 无锡威孚力达催化净化器有限责任公司 | SCR ammonia storage amount calculating method |
| CN106682428B (en) * | 2016-12-29 | 2019-03-19 | 无锡威孚力达催化净化器有限责任公司 | SCR ammonia amount of storage calculation method |
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Effective date of registration: 20200720 Address after: No.151, Jinling East Road, Weiting Town, Suzhou Industrial Park, Jiangsu Province, 215000 Patentee after: SUZHOU TIANLAN POWER TECHNOLOGY Co.,Ltd. Address before: 430070 Wuhan science and Technology Development Zone, East Lake hi tech Development Zone, Hubei, Patentee before: WUHAN TIANLAN ENGINE EMISSION TECHNOLOGY Co.,Ltd. |