CN102748101B - Urea injection system for reducing NOx discharge of engine and control method thereof - Google Patents
Urea injection system for reducing NOx discharge of engine and control method thereof Download PDFInfo
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- CN102748101B CN102748101B CN201210237631.6A CN201210237631A CN102748101B CN 102748101 B CN102748101 B CN 102748101B CN 201210237631 A CN201210237631 A CN 201210237631A CN 102748101 B CN102748101 B CN 102748101B
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Abstract
The invention discloses a urea injection system for reducing the NOx discharge of an engine. The urea injection system mainly comprises a urea supply unit, an injection unit, an unfreezing unit and a control unit. The urea supply unit comprises a urea unidirectional flow pump, a secondary filter, a first electromagnetic valve and a gas liquid mixer which are sequentially connected with a urea tank by a first pipeline; and a spray nozzle part in the injection unit is used for spraying the gas liquid mixture into an exhaust pipeline communicated with the upstream of an SCR (Selective Catalytic Reduction) catalyst; according to the system disclosed by the invention, urea is sucked out of the urea tank and a certain pressure is formed, the injection quantity of the urea is automatically regulated according to the operation working condition of the engine, and the urea is sprayed into the exhaust pipe of the engine after the urea is atomized by high pressure air so as to react with NOx discharged from the engine on the SCR catalyst, and thus, the aim of reducing the NOx discharge is fulfilled; and the control unit is communicated with an engine controller to coordinate the normal work of the integral system and monitor the working conditions of the system and the parts.
Description
Technical field
The present invention relates to a kind of motor emission purifying system, specifically a kind of urea-spray system for reducing motor NOx discharge.
Background technique
Rapid growth along with Chinese automobile output and recoverable amount, motor vehicle exhaust emission pollution problem is increasingly serious, in order to tackle this outstanding problem, country has put into effect the automobile emissions standards rules of different phase successively, and each automobile and motor enterprise have also progressively taked corresponding technical measures to meet to motor car engine to add gradually tight Abgasgesetz.Heavy Duty Diesel Engine aspect, state III emission standard and before substantially all adopt measure in machine to reach target, such as using high-pressure common rail, improve fuel-injection pressure, the discharge time of accurately controlling fuel oil and angle, use exhaust gas turbocharge improves motor charging efficiency, use EGR EGR Technology to reduce combustion temperature etc.; But at state IV Abgasgesetz and afterwards, only adopt measure in motor machine cannot reach the requirement of Abgasgesetz, at present more concernedly in Heavy Duty Diesel Engine discharge mainly contain two kinds of technology paths, be DPF particle trap and SCR selective reduction technology: the former need to be combined with EGR technology in machine, EGR object is the NOx discharge in reduction machine, and DPF is granular material discharged for reducing outside machine; Use SCR selective reduction technology, the means that can improve burning by some are carried out the generation of the particle emission in reduction machine, and by reducing agent and catalyzer, carry out the NOx discharge outside reduction machine in exhaust.
But use DPF technology to have higher requirement for the regeneration of Sulpher content in fuel oil and DPF, if Sulfur Content in Petroleum Products is too high, can directly have influence on the working life of catalyzer and DPF, therefore domestic most of enterprise all tends to meet by SCR technology the target call of discharge phase after state III at present.
SCR is a kind of selective catalytic reduction technology, and SCR technology is utilized NH
3(resultant after hydrolysis of urea), as reducing substances, under uniform temperature and catalyst action, utilizes NH
3nOx is reduced to N
2and H
2o.Due to NH
3optionally preferential reducing NOx and not elder generation and O under the effect of catalyzer
2reaction, therefore be called " selective catalytic reduction ".NH
3it is good reducing agent, but there is very strong excitant, be not easy to directly on automobile, use, and aqueous solution of urea is nontoxic, harmless, storage and convenient transportation and do not there is penetrating odor, therefore the general aqueous solution of urea of 32.5% concentration that uses is as the reducing agent of vehicle-mounted SCR system, in Europe, be referred to as Adblue, the U.S. is called as Diesel Exhaust Fluid (DEF), international standard ISO22241-1 < < Adblue Standard > > has also carried out the requirement of quality standard to the NOx reducing agent of diesel engine vent gas processing use.Use SCR technology, need to design a system, can be by urea-spray in engine exhaust pipe, this system need to meet following requirement:
1) how aqueous solution of urea is ejected in outlet pipe quantitatively, makes it to react on catalyzer with NOx effulent efficiently, this not only needs urea-spray system to control accurately urea injecting quantity, but also extraordinary atomizing effect need to be provided;
2) because aqueous solution of urea (conventionally at-11 ℃) at lower temperature can freeze, so system also needs to take the measure of thawing;
3) consider that the urea quality on market is very different, and also have particle residue in the course of working of system, need to design some measures in case locking system is blocked;
4) because the NOx generating under the different Operation Conditions of motor discharges pollutants, have a greater change, the working conditions change of motor is very frequent, therefore needs system according to engine operating condition, automatically to adjust and accurately control emitted dose;
At present, there is the automobile exhaust gas SCR reprocessing urea-spray system that can meet above requirement abroad, urea-spray system such as the exploitation of the disclosed PUREM of DE102006040411A1 company, the SCR system of the disclosed SIEMENS of US6209315B1, comprise the Grandfos company that applies on domestic market and the system of company of German Bosch, wherein some system adopts gas secondary injection, design comparison is ingenious, also there is reasonable atomizing effect, but be all below external system, the Design and manufacture cost of parts is very high, be unfavorable for SCR system spread at home.Domesticly in recent years, also there is similar system, the SCR urea-spray system that comprises the exploitation of the disclosed Wuxi Oil Pump Nozzle Inst of CN101737127A, the quantitative spraying device of the disclosed Suzhou PowerGreen Emission Solution System Co., Ltd. of CN101818677A, but above system is all also not too perfect, there are some problems, such as the scheme of thawing by engine exhaust of mentioning in the former system is not easy to realize, control; Though latter system is fairly simple, but in system, lack filter, cannot solve the problem of obstruction, and the passive voltage stabilizing air bag of its design, in the situation that closing, source of the gas cannot play the effect of accumulation of energy, during system closing, cannot effectively reflux, and without thawing measure, cannot solve the problem of freezing under urea low temperature.
Summary of the invention
For above-mentioned prior art, the invention provides a kind of urea-spray system for reducing motor NOx discharge, can be according to engine operating condition by the quantitative outlet pipe that is ejected into SCR catalyst converter upstream of urea, and under the effect of high-pressure air by its good atomization, the NOx pollutant that makes it to discharge with motor on SCR catalyst converter reacts, and reaches the object that reduces motor discharge; And the measure such as have good anti-plugging crystallization in urea-spray system of the present invention, thaw, can meet the requirement that motor reaches state IV and above emissions object.
In order to solve the problems of the technologies described above, the present invention for realizing the technological scheme of the urea-spray system that reduces motor NOx discharge is: comprise urea feeding unit, injection unit, unit and control unit thaw; Described urea feeding unit comprise by the first pipeline in turn with the tank connected urea straightway pump of urea, secondary filter cleaner, the first solenoid valve and air and liquid mixer; In described urea tank, be provided with one-level filter cleaner, the first temperature transducer and liquid level sensor; Pipeline between described urea straightway pump and described secondary filter cleaner is provided with a threeway, and this three pipeline passing between described urea tank is the second pipeline certainly, and described the second pipeline is connected with one end of a urea backflow Pneumatic valve; On described the first pipeline, between described secondary filter cleaner and described the first solenoid valve, be provided with the second temperature transducer, urea pressure transducer and accumulator; Described accumulator is bag type accumulator, and described accumulator is communicated with the gas piping that comes from vehicle-mounted source of the gas by the first one-way valve; On described gas piping, from vehicle-mounted source of the gas, between described the first one-way valve, be provided with successively gas cleaner, gas pressure reducer, the second solenoid valve and the second one-way valve; The other end of described urea backflow Pneumatic valve is communicated with described gas piping, and this connection node is a four-way, and described four-way is also communicated with a gas throttling orifice plate, described the first one-way valve and described the second one-way valve; The other end of described gas throttling orifice plate is connected to described air and liquid mixer; Described injection unit comprises nozzle component, described nozzle component is for being ejected into by gas-liquid mixture the gas exhaust piping being communicated with the SCR catalyst converter upstream of vehicle, described nozzle component comprises nozzle, body and the interface tube connecting successively, on described body, be set with set screw nut, between described set screw nut and described body, be provided with retaining washer, in described nozzle, be inlaid with fan nozzle core, described nozzle is provided with a plurality of spray-holes, described spray-hole axially consistent with engine exhaust airflow direction; Described interface tube is connected with described air and liquid mixer; The downstream of described SCR catalyst converter is provided with three-temperature sensor and NOx sensor; The described unit that thaws comprises cooling water thawing structure and electric heating device structure, wherein, described cooling water thawing structure is to utilize the cooling water on vehicle motor to realize thawing of urea tank, described cooling water thawing structure comprises and the tank connected water thawing pipeline of described urea, and described water thawing pipeline is provided with the 3rd solenoid valve; Described electric heating device structure is thawed for system the first pipeline and the second pipeline; Described electric heating device structure comprises resistance wire; Described control unit is comprised of signal processing module, power driver module, bus driver module, power module and single-chip microcomputer; Described control unit carries out communication by the control unit of engine of CAN bus and vehicle, to obtain engine speed, torque signal; Simultaneously, described control unit and described urea feeding unit with described in the thaw urea straightway pump in unit, all solenoid valves be connected with all the sensors, described control unit receives the signal of all the sensors, described control unit is controlled the running of described urea straightway pump or is stopped, and described control unit is controlled the unlatching of all solenoid valves or closed.
The present invention is for reducing the method for urea injection control of motor NOx discharge, comprise: the signal processing module in described control unit continues to receive the signal that comes from the first temperature transducer, the second temperature transducer, three-temperature sensor, liquid level sensor and pressure transducer, and signal is carried out to data transfer, be then sent to single-chip microcomputer; Described control unit is controlled by power driver module as follows according to the data that receive: control the start and stop of urea straightway pump, in order to realize the startup of urea-spray system; Control the closure or openness of start and stop, the break-make of the first solenoid valve, the unlatching cycle of the second solenoid valve and the urea backflow Pneumatic valve of urea straightway pump, in order to realize the metered injection of urea-spray system; Control the break-make of the first solenoid valve, the closure or openness of the break-make of the second solenoid valve and urea backflow Pneumatic valve, in order to realize emptying in the shutdown of urea-spray system and stopping process; Control energising and the power-off of resistance wire in the closure or openness, electric heating device structure of the 3rd solenoid valve, in order to realize thawing of urea-spray system; Control unit continues to monitor the NOx emissions data recording according to described NOx sensor, and binding engine rotating speed and torque load information calculate the emission result of NOx, when this result is during higher than limit value under normal circumstances of motor, control unit is pointed out by warning.
Further, described motor limit value under normal circumstances refers to the requirement that will meet in automobile-used compression-ignited, the gaseous fuel spark-ignition engine of NBS < < GB17691-2005 and automobile exhaust pollutant discharge limit value and method of measurement > >.
Compared with prior art, the invention has the beneficial effects as follows:
(1) urea-spray system of the present invention adopts the auxiliary atomizing type of air, and gas can be from the air pressure pump on car, also can be from additional compressed air pump; In the middle of gas piping and air and liquid mixer, be designed with gas throttling hole excessive to prevent gas flow;
2), in order to guarantee the life-span of urea straightway pump, this urea straightway pump adopts intermittent work mode;
3) in the urea feeding unit of urea-spray system of the present invention, adopt bag type accumulator to put aside urea pressure, the in the situation that of urea straightway pump service intermittent, guarantee that urea-spray system still can have enough pressure to spray;
4) in urea-spray system of the present invention, designed multistage cleaner structure, for filter the impurity of urea and produce in the particle that generates, prevent from stopping up;
5) in urea-spray system of the present invention, adopt gas backstreaming control valve, when gas pressure is eliminated, the urea liquid in the first pipeline and the second pipeline can be back in urea tank;
6) urea-spray system of the present invention by the measure of thawing of engine cooling water heating and electric heating hybrid mode, can eliminate urea and freeze phenomenon;
7) in order to reach good atomizing effect, urea-spray system of the present invention has air and liquid mixer; In addition, in nozzle component, be designed with miniature mixed aerosol structure.
Accompanying drawing explanation
Fig. 1-1st, the present invention forms schematic diagram for the urea-spray system of engine exhaust reprocessing;
Fig. 1-2 is that in urea-spray system of the present invention, urea feeding unit forms schematic diagram;
Fig. 1-3rd, cell formation schematic diagram thaws in urea-spray system of the present invention;
Fig. 2 is the sectional view of injection unit 15 in urea-spray system of the present invention;
Fig. 3-1st, the master of the core of fan nozzle shown in Fig. 2 looks zoomed-in view;
Fig. 3-2nd, the plan view of the core of fan nozzle shown in Fig. 3-1;
Fig. 3-3rd, the side view of the core of fan nozzle shown in Fig. 3-1;
Fig. 4 be in urea-spray system of the present invention control unit form and with the block diagram that is connected of associated components;
Fig. 5 is the main flow chart of method for urea injection control of the present invention;
Fig. 6 is the startup flow chart of urea-spray system of the present invention;
Fig. 7 is the flow chart that stops of urea-spray system of the present invention.
In figure:
1-liquid level sensor 2-the first temperature transducer 3-urea tank
4-one-level filter cleaner 5-the 3rd solenoid valve 6-water thawing pipeline
7-urea straightway pump 8-secondary filter cleaner 9-accumulator
10-first one-way valve 11-the first solenoid valve 12-SCR catalyst converter
13-NOx sensor 14-three-temperature sensor 15-injection unit
16-air and liquid mixer 17-control unit 18-gas throttling orifice plate
19-pressure transducer 20-the second temperature transducer 21-backflow Pneumatic valve
22-second one-way valve 23-the second solenoid valve 24-gas pressure reducer
Vehicle-mounted source of the gas 27-the first pipeline of 25-gas cleaner 26-
28-the second pipeline 31-nozzle 32-body
33-interface tube 34-retaining washer 35-set screw nut
36-fan nozzle core 37-spray-hole.
Embodiment
A kind of urea-spray system for reducing motor NOx discharge of the present invention mainly comprises urea feeding unit, injection unit, thaw unit and control unit, below in conjunction with accompanying drawing, technical solution of the present invention is described in further detail.
As shown in Figure 1-2, the described urea feeding unit in system of the present invention mainly comprise urea straightway pump 7, secondary filter cleaner 8, accumulator 9, urea backflow Pneumatic valve 21, the second one-way valve 22 of controlling for gas circuit and the second solenoid valve 23, the first solenoid valve 11 of controlling for urea supply amount, air and liquid mixer 16, for monitoring the pressure transducer 19 of pipeline urea pressure and temperature and the second temperature transducer 20 etc.
As Fig. 1-1, urea straightway pump 7, secondary filter cleaner 8, the first solenoid valve 11 and air and liquid mixer 16 that described urea tank 3 is connected with urea tank 3 in turn by the first pipeline 27; In described urea tank 3, be provided with one-level filter cleaner 4, the first temperature transducer 2 and liquid level sensor 1.
Pipeline between described urea straightway pump 7 and described secondary filter cleaner 8 is provided with a threeway, and this three pipeline passing between described urea tank 3 is the second pipeline 28 certainly, and described the second pipeline 28 is connected with one end of a urea backflow Pneumatic valve 21.Described the first pipeline 27 is being provided with the second temperature transducer 20, urea pressure transducer 19 and accumulator 9 between described secondary filter cleaner 8 and described the first solenoid valve 11; Described accumulator 9 is bag type accumulator, and described accumulator 9 is communicated with the gas piping that comes from vehicle-mounted source of the gas by the first one-way valve 10; On described gas piping from vehicle-mounted source of the gas 26 to being provided with successively gas cleaner 25, gas pressure reducer 24, the second solenoid valve 23 and the second one-way valve 22 between described the first one-way valve 10; The other end of described urea backflow Pneumatic valve 21 is communicated with described gas piping, and this connection node is a four-way, and described four-way is also communicated with a gas throttling orifice plate 18, described the first one-way valve 10 and described the second one-way valve 22; The other end of described gas throttling orifice plate 18 is connected to described air and liquid mixer 16.
After startup system, urea straightway pump 7 by urea from the interior sucking-off of urea tank 3, after urea secondary filter cleaner 8, be fed in the first pipeline, at the second solenoid valve 23, do not open in situation, there is no gas in gas piping, urea backflow Pneumatic valve 21 is in normally open, urea is back in urea tank 3 by urea backflow Pneumatic valve 21, and the first pipeline 27 pressure cannot reach the minimum requirements that system is sprayed.When the second solenoid valve 23 is opened, in gas piping, there is certain gas pressure, urea backflow Pneumatic valve 21 is closed, the interior build-up pressure of the first pipeline 27, under this pressure-acting, urea enters in accumulator 9, when pressure reaches after certain upper limit, 17 of control units are closed urea straightway pump 7.
Accumulator in the present invention 9 adopts bag type accumulators, can when 7 running of urea straightway pump, put aside a certain amount of urea, and when this urea straightway pump 7 stops, the urea of accumulator 9 interior savings is that the first pipeline is supplied urea and sprayed needed pressure.The fluctuation that accumulator 9 can also be stablized the first pipeline inner pressure simultaneously.Other one end of bag type accumulator connects gas piping by the first one-way valve 10.When the second solenoid valve 23 is opened, when gas enters system, pressure and gas pressure in accumulator leather bag are suitable; When the second solenoid valve 23 cuts out, during gas piping pressure drop, accumulator leather bag internal pressure remains unchanged, and has avoided, because of the gas in the long-term not used time leather bag of accumulator, the problem that cannot normally work occurs to leak.
In the present invention, adopt two-stage depuration structure, realize one-level filtering urea tank 3 is interior, in the first pipeline 27, realize secondary filtering, the secondary filter cleaner 8 being arranged on the first pipeline 27 is mainly used in filtering the impurity in aqueous solution of urea, can prevent because impurity enters the phenomenon that the first solenoid valve 11 that liquid line causes stops up, having eliminated affects the first solenoid valve 11 and sprays the undesirable element of accuracys.
When controlling the second solenoid valve 23 of gas break-make and open, the pressurized gas on car can be incorporated in system pipeline by a gas pressure reducer 24.In general commercial car, there is air pressure pump, to offer the systems such as brake, power steering, use.The gas of drawing-in system can, for the atomization of aqueous solution of urea, can also play the effect that urea refluxes of interrupting by controlling urea backflow Pneumatic valve 21 on the one hand on the other hand.
Urea backflow Pneumatic valve 21 in system of the present invention adopts diaphragm type control valve, and wherein, a side of diaphragm is gas, and the opposite side of diaphragm is liquid, is controlled the break-make of the second pipeline 28 by the displacement of diaphragm.That is,, when control end has certain gas pressure, now the second pipeline cut-off, can prevent that the interior aqueous solution of urea of the first pipeline 27 is back in urea tank 3 by the second pipeline 28, thereby guarantees the foundation of the pressure of urea main pipeline; When system has just started or will stop, the second solenoid valve 23 cuts out, gas pressure declines, urea backflow Pneumatic valve 21 is opened, accumulator and the interior aqueous solution of urea of the first pipeline 27 are back in urea tank 3 by the second pipeline 28, thereby prevent that the urea liquid being accumulated in the situation that temperature is lower in ejecting system from freezing.
Air and liquid mixer 16 in system of the present invention is for mixing liquids and gases, liquid is sprayed onto in air and liquid mixer 16 by the first solenoid valve 11, the another one path of air and liquid mixer 16 connects pressurized gas, gas is to be connected in air and liquid mixer 16 by gas throttling orifice plate 18, not too big to guarantee gas flow, avoid consuming excessively Vehicular compressed air.Gas and liquid are connected to the nozzle component in injection unit 15 after the interior abundant mixing of air and liquid mixer 16.When system cisco unity malfunction, in order to guarantee that liquid can not enter into gas circuit, in the rear end of the second solenoid valve 23, be furnished with the second one-way valve 22.
The first solenoid valve 11 in system of the present invention is for controlling the emitted dose of urea, one end of this first solenoid valve 11 is connected with the downstream of the first pipeline, the other end is connected in air and liquid mixer 16, this first solenoid valve 11 is controlled by pulsewidth modulation (PWM) by control unit 17, control unit 17 is adjusted PWM dutycycle automatically according to the pressure at engine operating condition and these the first solenoid valve 11 two ends, thereby reaches the object of controlling emitted dose.In addition, when supply voltage is during higher than the voltage rating of the first solenoid valve 11, use the mode of pulsewidth modulation (PWM) to control inputting the voltage of the first solenoid valve 11, it is conformed to, to protect the first solenoid valve 11 with the voltage rating of demand.
As Figure 1-3, the unit that thaws in system of the present invention is thawed by cooling water and electric heating thawing structure combines, wherein, described cooling water thawing structure is to utilize the cooling water of motor to solve the problem of thawing of urea tank 3, comprise the water thawing pipeline 6 being connected with urea tank 3, on water thawing pipeline 6, be provided with the 3rd solenoid valve 5; Electric heating thawing structure for resolution system for entering the pipeline (the first pipeline 27 connects the part of urea box and urea straightway pump) of urea and for the second pipeline 28 of the urea that refluxes and the problem of thawing of pipeline upper connection, in pipeline outside, cover electric heater, most typical is, in pipeline outside, resistive heater is set.
As Figure 1-1, described injection unit 15 in system of the present invention comprises nozzle component, described nozzle component is for being ejected into by gas-liquid mixture the gas exhaust piping being communicated with SCR catalyst converter 12 upstreams of vehicle, and the downstream of described SCR catalyst converter 12 is provided with three-temperature sensor 14 and NOx sensor 13.As shown in Figure 2, described nozzle component comprises the nozzle 31 connecting successively, body 32 and interface tube 33, on described body 32, be set with set screw nut 35, between described set screw nut 35 and described body 32, be provided with retaining washer 34, in described nozzle 31, be inlaid with fan nozzle core 36, as Fig. 3-1, shown in Fig. 3-2 and Fig. 3-3, described fan nozzle core 36 consists of the limb of two intersections, on each limb, be equipped with the flow guide structure of rectangular indentation, in nozzle 31, the design of fan-shaped nozzle core 36 can reach the effect that disperses and dredge urea and gas fluid-mixing, can make atomizing effect more evenly fine and closely woven, described nozzle 31 is provided with a plurality of spray-holes 37, described spray-hole 37 be axially that the opening direction of jetburner is all consistent with engine exhaust airflow direction, thereby can reduce inner pressure surge, increase the continuity of jet-stream wind, improve its reliability.Described interface tube 33 is connected with described air and liquid mixer 16, and described interface tube meets SAE J2044-2002 standard, can adopt rapid pipe joint, is convenient to be connected with air and liquid mixer 16.The fluid-mixing of urea liquid and gas by air and liquid mixer 16 through interface tube 33 and body 32, and by dispersion and the drainage of fan nozzle core 36, last by even and continuous being ejected in the gas exhaust piping being communicated with SCR catalyst converter 12 upstreams of nozzle 31, realize the good atomizing effect of aqueous solution of urea.Whole injection unit parts all adopt stainless steel to process, can be in case urea corrosion has the feature high temperature resistant, reliability is high, simple and practical.
As shown in Figure 5, the control unit in system of the present invention be mainly used in controlling whole system startup, stop, according to urea pipe pressure, control the running of urea straightway pump and stop; According to engine operation condition, the aperture by controlling the first solenoid valve is to adjust emitted dose; According to information such as urea and ambient temperatures, control the unit that thaws, and be responsible for carrying out the diagnosis to all various sensors and performer; Carry out communication with control unit of engine and other control unit for vehicle, SCR system operation information is passed to other control units and carries out corresponding actions according to the information of other control unit transmission; Control unit 17 is also responsible for continuing to monitor motor discharge in addition, when causing for a certain reason motor discharge to exceed standard, relevant information is passed to control unit of engine.
The basic controlling flow process of 17 pairs of ejecting systems of control unit is as shown in Fig. 5, Fig. 6 and Fig. 7.Control unit 17 is when "on" position, and after receiving actuating signal, the system that enters starts flow process, as shown in Figure 6, starts urea-spray system; By judging that the temperature value of the first temperature transducer 2, the second temperature transducer 20 feedbacks judge that whether system is icing, the demand motive unit that thaws thaws; In the situation of having thawed or not needed to thaw, whether the force value by judging pressure transducer feedback is higher than the lower limit of setting or lower than CLV ceiling limit value, start or stop urea straightway pump 7, pressure in the first pipeline 27 is remained in the pressure range of setting, and lasting control the first solenoid valve 11, accurately metered injection aqueous solution of urea; When control unit 17 receives after stop signal, stop urea straightway pump 7, enter shutdown flow process, as shown in Figure 7.
As shown in Figure 4, the described control unit 17 in system of the present invention is comprised of signal processing module, power driver module, bus driver module, power module and single-chip microcomputer; Described control unit 17 carries out communication by the control unit of engine of CAN bus and vehicle, to obtain engine speed, torque signal; Simultaneously, described control unit 17 and described urea feeding unit with described in the thaw urea straightway pump 7 in unit, all solenoid valves be connected with all the sensors, described control unit 17 receives the signal of all the sensors, described control unit 17 is controlled the running of described urea straightway pump 7 or stops, and described control unit 17 is controlled the unlatching of all solenoid valves or closes.
Signal processing module in described control unit 17 continues to receive the signal that comes from the first temperature transducer 2, the second temperature transducer 20, three-temperature sensor 14, liquid level sensor 1 and pressure transducer 19, and signal is carried out to data transfer, be then sent to single-chip microcomputer; Described control unit 17 is controlled by power driver module as follows according to the data that receive:
Described control unit 17 is controlled the start and stop of urea straightway pump 7, in order to realize the startup of urea-spray system; As shown in Figure 4, Figure 5 and Figure 6, in system starting process, the second solenoid valve 23 cuts out, and urea backflow Pneumatic valve 21 is in opening state; 7 runnings of urea straightway pump, system stop urea straightway pump 7 after being full of urea, and the second solenoid valve 23 is opened simultaneously, and urea backflow Pneumatic valve 21 is closed.
Described control unit 17 is controlled the closure or openness of start and stop, the unlatching cycle of the first solenoid valve 11, the break-make of the second solenoid valve 23 and the urea backflow Pneumatic valve 21 of urea straightway pump 7, in order to realize the metered injection of urea-spray system.
Described control unit 17 is controlled the closure or openness of the break-make of the first solenoid valve 11, the break-make of the second solenoid valve 23 and urea backflow Pneumatic valves 21, in order to realize emptying in the shutdown of urea-spray system and stopping process; As shown in Figure 7, in system stopped process, first urea straightway pump 7 cuts out, then the second solenoid valve 23 and the first solenoid valve 11 successively opening and closing for several times, make urea residual in system pipeline thoroughly be back in urea tank 3 along the second pipeline.
Energising and the power-off of resistance wire in the closure or openness of described control unit 17 control the 3rd solenoid valves 5, electric heating device structure, in order to realize thawing of urea-spray system; As shown in Fig. 1-1, Fig. 4 and Fig. 5, in the urea tank 3 being recorded by the first temperature transducer 2 and the second temperature transducer 20 record temperature in pipeline lower than set lower limit time, control unit 17 will be opened the 3rd solenoid valve 5, and connect the resistance wire for heating pipe; In the urea tank 3 being recorded by the first temperature transducer 2 and the second temperature transducer 20 record temperature in pipeline higher than set CLV ceiling limit value time, control unit 17 is closed the 3rd solenoid valve 5, and cuts off the power supply of described resistance wire.
To sum up, the present invention is the urea metering injection system for reducing motor NOx discharge, adopts the auxiliary atomizing type of air, and gas can be from the air pressure pump on car, also can be from additional compressed air pump.In the middle of gas piping and air and liquid mixer 16, be designed with gas throttling orifice plate 18 excessive to prevent gas flow.In order to guarantee the life-span of urea direct current urine 7, urea straightway pump 7 adopts intermittent work mode.In urea feeding unit, adopt bag type accumulator to put aside urea, the in the situation that of urea straightway pump 7 service intermittent, assurance system can be carried out normal injection.The fluctuation that accumulator 9 can also be stablized main line internal pressure simultaneously.In addition, in system of the present invention, designed have two-stage filtering filter the impurity in urea and produce in the particle that generates, prevent that stopping up from appearring in pipeline, valve body and shower nozzle; In order to prevent that residual liquid from causing destroying pump body structure because of sharp freezing, volumetric expansion, near urea straightway pump 7, be provided with urea backflow Pneumatic valve 21, when gas pressure is eliminated after system closedown, the liquid backflow in main line can be disposed in urea tank 3; Also have, in the process of system closing, introduce gas, by the control of logic, realize necessary evacuation step and method, thereby discharge the residual liquid of internal system.In order to prevent from using in cold area, urea liquid is located to freeze, stop up at urea box, pipeline and urea straightway pump etc., has designed the measure of thawing by engine cooling water heating and electric heating hybrid mode in system of the present invention.
Although in conjunction with figure, invention has been described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present invention; in the situation that not departing from aim of the present invention, can also make a lot of distortion, within these all belong to protection of the present invention.
Claims (10)
1. for reducing a urea-spray system for motor NOx discharge, comprise urea feeding unit, injection unit and control unit, it is characterized in that, also comprise the unit that thaws;
Described urea feeding unit comprises urea straightway pump (7), secondary filter cleaner (8), the first solenoid valve (11) and the air and liquid mixer (16) being connected with urea tank (3) in turn by the first pipeline; In described urea tank (3), be provided with one-level filter cleaner (4), the first temperature transducer (2) and liquid level sensor (1);
Pipeline between described urea straightway pump (7) and described secondary filter cleaner (8) is provided with a threeway, and this three pipeline passing between described urea tank (3) is the second pipeline certainly, and described the second pipeline is connected with one end of a urea backflow Pneumatic valve (21);
On described the first pipeline, between described secondary filter cleaner (8) and described the first solenoid valve (11), be provided with the second temperature transducer (20), urea pressure transducer (19) and accumulator (9) being positioned at; Described accumulator (9) is bag type accumulator, and described accumulator (9) is communicated with the gas piping that comes from vehicle-mounted source of the gas by the first one-way valve (10);
On described gas piping, from vehicle-mounted source of the gas (26), between described the first one-way valve (10), be provided with successively gas cleaner (25), gas pressure reducer (24), the second solenoid valve (23) and the second one-way valve (22);
The other end of described urea backflow Pneumatic valve (21) is communicated with described gas piping, and this connection node is a four-way, and described four-way is also communicated with a gas throttling orifice plate (18), described the first one-way valve (10) and described the second one-way valve (22); The other end of described gas throttling orifice plate is connected to described air and liquid mixer (16);
Described injection unit (15) comprises nozzle component, described nozzle component is for being sprayed onto by gas-liquid mixture the gas exhaust piping being communicated with SCR catalyst converter (12) upstream of vehicle, described nozzle component comprises the nozzle (31) connecting successively, body (32) and interface tube (33), on described body (32), be set with set screw nut (35), between described set screw nut (35) and described body (32), be provided with retaining washer (34), in described nozzle (31), be inlaid with fan nozzle core (36), described nozzle (31) is provided with a plurality of spray-holes (37), described spray-hole (37) axially consistent with engine exhaust airflow direction, described interface tube (33) is connected with described air and liquid mixer (16), the downstream of described SCR catalyst converter (12) is provided with three-temperature sensor (14) and NOx sensor (13),
The described unit that thaws comprises cooling water thawing structure and electric heating device structure, wherein, described cooling water thawing structure is to utilize the cooling water on vehicle motor to realize thawing of urea tank (3), described cooling water thawing structure comprises the water thawing pipeline (6) being connected with described urea tank (3), and described water thawing pipeline (6) is provided with the 3rd solenoid valve (5); Described electric heating device structure is thawed for system the first pipeline and the second pipeline; Described electric heating device structure comprises resistance wire;
Described control unit (17) is comprised of signal processing module, power driver module, bus driver module, power module and single-chip microcomputer; Described control unit (17) carries out communication by the control unit of engine of CAN bus and vehicle, to obtain engine speed, torque signal; Simultaneously, described control unit (17) and described urea feeding unit with described in the thaw urea straightway pump (7) in unit, all solenoid valves be connected with all the sensors, described control unit (17) receives the signal of all the sensors, described control unit (17) is controlled the running of described urea straightway pump (7) or is stopped, and described control unit (17) is controlled the unlatching of all solenoid valves or closes.
2. the urea-spray system of discharging for reducing motor NOx according to claim 1, it is characterized in that, described urea reflux gas control valve (21) adopts diaphragm type control valve, wherein, one side of diaphragm is gas, the opposite side of diaphragm is liquid, is controlled the open and close of the second pipeline by the displacement of diaphragm.
3. according to claim 1 for reducing the urea-spray system of motor NOx discharge, it is characterized in that, described urea straightway pump (7) for by urea from urea tank (3) extraction, and be liquid carrying in the first pipeline pressure for liquid.
4. for reducing a method for urea injection control for motor NOx discharge, it is characterized in that, adopt the urea-spray system of discharging for reducing motor NOx as claimed in claim 1, its controlling method comprises:
Signal processing module in described control unit (17) continues to receive the signal that comes from the first temperature transducer (2), the second temperature transducer (20), three-temperature sensor (14), liquid level sensor (1) and pressure transducer (19), and signal is carried out to data transfer, be then sent to single-chip microcomputer;
Described control unit (17), according to the data that receive, is controlled as follows by power driver module:
Control the start and stop of urea straightway pump (7), in order to realize the startup of urea-spray system;
Control start and stop, the break-make of the first solenoid valve (11), the closure or openness of the unlatching cycle of the second solenoid valve (23) and urea backflow Pneumatic valve (21) of urea straightway pump (7), in order to realize the metered injection of urea-spray system;
Control the closure or openness of the break-make of the first solenoid valve (11), the break-make of the second solenoid valve (23) and urea backflow Pneumatic valve (21), in order to realize emptying in the shutdown of urea-spray system and stopping process;
Control energising and the power-off of resistance wire in the closure or openness, electric heating device structure of the 3rd solenoid valve (5), in order to realize thawing of urea-spray system;
Control unit (17) continues to monitor the NOx emissions data recording according to described NOx sensor (13), and binding engine rotating speed and torque load information calculate the emission result of NOx, when this result is during higher than limit value under normal circumstances of motor, control unit (17) is pointed out by warning.
5. the method for urea injection control discharging for reducing motor NOx according to claim 4, it is characterized in that, described urea straightway pump (7) adopts intermittent work mode, by described control unit (17), according to the measured pressure of pressure transducer (19), controls described urea straightway pump (7) start and stop.
6. the method for urea injection control discharging for reducing motor NOx according to claim 4, it is characterized in that, described motor limit value under normal circumstances refers to the requirement that will meet in automobile-used compression-ignited, the gaseous fuel spark-ignition engine of NBS < < GB17691-2005 and automobile exhaust pollutant discharge limit value and method of measurement > >.
7. according to claim 4 for reducing the method for urea injection control of motor NOx discharge, it is characterized in that, in system starting process, the second solenoid valve (23) cuts out, and urea backflow Pneumatic valve (21) is in opening state; Urea straightway pump (7) running, system stop urea straightway pump (7) after being full of urea, and the second solenoid valve (23) is opened simultaneously, and urea backflow Pneumatic valve (21) is closed.
8. the method for urea injection control discharging for reducing motor NOx according to claim 4, it is characterized in that, in system stopped process, first urea straightway pump (7) cuts out, then the successively opening and closing of the second solenoid valve (23) and the first solenoid valve (11) for several times, make urea residual in system pipeline thoroughly be back in urea tank (3) along the second pipeline.
9. the method for urea injection control discharging for reducing motor NOx according to claim 4; it is characterized in that; when supply voltage is during higher than the voltage rating of the second solenoid valve (11); use the mode of pulsewidth modulation to control inputting the voltage of the second solenoid valve (11); it is conformed to, to protect the second solenoid valve (11) with the voltage rating of demand.
10. the method for urea injection control discharging for reducing motor NOx according to claim 4, it is characterized in that, in the urea tank (3) being recorded by the first temperature transducer (2) and when the second temperature transducer (20) records temperature pipeline in lower than the lower limit of setting, control unit (17) will be opened the 3rd solenoid valve (5), and connect the resistance wire for heating pipe; In the urea tank (3) being recorded by the first temperature transducer (2) and when the second temperature transducer (20) records temperature pipeline in higher than the CLV ceiling limit value of setting, control unit (17) is closed the 3rd solenoid valve (5), and cuts off the power supply of described resistance wire.
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