CN103046989A - Plug-and-play urea spraying control method and system - Google Patents
Plug-and-play urea spraying control method and system Download PDFInfo
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- CN103046989A CN103046989A CN2012105330973A CN201210533097A CN103046989A CN 103046989 A CN103046989 A CN 103046989A CN 2012105330973 A CN2012105330973 A CN 2012105330973A CN 201210533097 A CN201210533097 A CN 201210533097A CN 103046989 A CN103046989 A CN 103046989A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention provides a plug-and-play urea spraying control method and system. An electronic control unit (ECU) calculates a urea spraying quantity needing spraying according to engine speed, circulation fuel oil spraying quantity, nitric oxide concentration in engine emission and exhaust gas flow; the calculated urea spraying quantity is sent to a data collection unit (DCU) through a controller area network (CAN) bus; and the DCU controls urea spraying according to the received urea spraying quantity. The ECU completes calculation of the urea spraying quantity, and the DCU only needs to execute the urea spraying according to the urea spraying quantity sent by the ECU. The DCU is only an actuator and does not need to calculate calculation of the urea spraying quantity, correspondingly data relative to the urea spraying quantity are not received any more, and the data are received by the ECU. Therefore, when an aftertreatment system (including DCU) is switched, re-standardization on aftertreatment data in the DCU is not needed, the aftertreatment data can be used after direct switching, and accordingly a plug-and-play mode is achieved. The plug-and-play urea spraying control method and system brings great convenience to production and follow-up management.
Description
Technical field
The present invention relates to the motor exhaust processing technology field, particularly a kind of method for urea injection control of plug and play and system.
Background technique
Selective catalytic reduction (SCR, Selective Catalytic Reduction) technology is one of main post-processing technology of eliminating nitrogen oxide in the diesel exhaust gas.
Mainly be divided into control unit, urea dosage device and catalytic reaction unit three parts according to function SCR system.
The control unit of SCR system and the control unit of motor (ECU) integrate, be mainly used in carrying out the SCR control strategy, and according to the sensor signals such as ambient temperature, delivery temperature, urea level, urea temperature, urea pressure, nitrogen oxide (NOx) concentration control urea dosage device, so that the urea dosage device is mapped to spraying urea liquid in the exhaust airstream according to demand at regular time and quantity; The urea dosage device mainly comprises urea box, urea supply unit, urea-spray unit, heating module and connecting pipeline and circuit, guarantees abundant atomizing and the decomposition of urea liquid; The catalytic reaction unit mainly comprises SCR catalyzer and encapsulation thereof, and the main harmful components reduction of nitrogen oxide that is used for diesel exhaust gas is the nitrogen G﹠W.
SCR system basic functional principle: exhaust enters the outlet pipe after booster turbine flows out, by the urea-spray unit that is installed on the outlet pipe quantitative aqueous solution of urea is sprayed in the outlet pipe with vaporific form simultaneously, urea droplets issues unboiled water solution and pyrolytic reaction in the high-temp waste gas effect, generate needed reducing agent ammonia (NH3), ammonia (NH3) is reduced to nitrogen (N2) selectively with the main harmful components nitrogen oxide (NOx) in the diesel exhaust gas under the effect of catalyzer.Sometimes cause secondary pollution in order to prevent that too much ammonia (NH3) from escaping, also need to arrange at SCR catalyzer rear and impel ammonia (NH3) to be oxidized to the catalyzer of nitrogen (N2).
The molecular formula of urea is NH2CONH2, at high temperature resolves into NH3 and CO2 after adding water H2O, and this reaction does not need catalytic condition to finish:
NH
2CONH
2+H
2O→2NH
3+CO
2 （1）
NH3 in the SCR catalyst converter and the NO in the exhaust, NO2 reaction produce N2 and H2O:
2NO+2NO
2+4NH
3→4N
2+6H
2O （2）
4NO+O
2+4NH
3→4N
2+6H
2O （3）
2NO
2+O
2+4NH
3→3N
2+6H
2O （4）
For preventing the leakage of ammonia in the whole using process of motor, the catalyst converter of eliminating ammonia need to be set after the SCR catalyst converter sometimes, NH3 and O2 reaction generates N2 and H2O in this catalyst converter:
4NH
3+3O
2→2N
2+6H
2O （5）
The urea-spray control unit of after-treatment system of the prior art (DCU, Dosing ControlUnit) is separate with the ECU (Electrical Control Unit) ECU of motor.The information such as the needed urea injecting quantity of after-treatment system are stored among the DCU, DCU calculates according to engine signal, the urea injecting quantity that acquisition needs, according to the sensor signals such as ambient temperature, delivery temperature, urea level, urea temperature, urea pressure, NOx concentration control urea dosage device, spraying urea liquid is mapped in the exhaust airstream according to demand simultaneously at regular time and quantity.
But, in the above technology, because engine model is different with former machine (engine system that does not comprise after-treatment system) discharging, cause the DCU reprocessing data relevant with urea injecting quantity (such as transformation efficiency etc.) also different, the DCU of SCR system data must be corresponding one by one with the ECU data of motor, if changing appears in the data relevant with emission performance in the Engine ECU, data also need again to demarcate among the DCU; If carry out the switching of the after-treatment system (comprising DCU) of different model, then need the emissions data among the DCU after switching is demarcated again.To increase like this DCU staking-out work and roll off the production line and write with a brush dipped in Chinese ink the data management problem that (EOL) brings, bring simultaneously the alteration problems of after-treatment system data in the subsequent production process, make troubles to production.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method for urea injection control and system of plug and play, do not need the reprocessing data among the DCU are demarcated again, can directly switch use, thereby realize the pattern of plug and play, for producing and follow-up management brings great convenience.
The embodiment of the invention provides a kind of method for urea injection control of plug and play, comprising:
The ECU (Electrical Control Unit) ECU of motor calculates the urea injecting quantity that needs spray according to nitrous oxides concentration and exhaust gas flow in engine speed, circulation fuel injection amount, the engine emission; And the urea injecting quantity that calculates sent to urea-spray control unit DCU by the CAN bus;
Described urea-spray control unit DCU is according to the injection of the described urea injecting quantity control urea that receives.
Preferably, before described DCU control urea-spray, also comprise:
Described DCU is by liquid level information and the temperature information of urea in the urea box of CAN bus reception ECU transmission;
The pressure information of urea, temperature information and compressed-air actuated pressure in the urea pump that described DCU directly receives;
Described DCU is according to liquid level information, the temperature information of urea in the described urea box, and pressure information, temperature information, the compressed-air actuated pressure of urea judges whether to satisfy urea injection conditions in the urea pump; If satisfy, then described DCU is according to the injection of the described urea injecting quantity control urea that receives.
Preferably, described urea-spray control unit DCU is according to the injection of the described urea injecting quantity control urea that receives, and be specially: described DCU sends the urea injecting quantity signal to urea pump, and the control urea pump is finished the injection of described urea injecting quantity by urea nozzle.
Preferably, described ECU calculates the urea injecting quantity that needs spray according to nitrous oxides concentration and exhaust gas flow in engine speed, circulation fuel injection amount, the engine emission, is specially:
Described ECU reads the nitrous oxides concentration of motor according to engine speed and circulation fuel injection amount, and described engine speed, circulation fuel injection amount and nitrous oxides concentration form MAP figure, are to concern one to one between the three;
Described ECU is scaled nitrogen oxide mass flow by the nitrous oxides concentration that reads according to exhaust gas flow again, multiply by ammonia nitrogen than calculate the urea injecting quantity that needs injection divided by concentration of aqueous solution of urea again.
Preferably, after calculating the urea injecting quantity that needs to spray, also comprise the urea injecting quantity that described ECU sprays according to delivery temperature correction needs.
The embodiment of the invention also provides a kind of urea-spray control system of plug and play, comprising: the ECU (Electrical Control Unit) ECU of urea-spray control unit DCU and motor;
The ECU (Electrical Control Unit) ECU of described motor is used for calculating the urea injecting quantity that needs spray according to engine speed, circulation fuel injection amount, engine emission nitrous oxides concentration and exhaust gas flow; And the urea injecting quantity of described calculating sent to urea-spray control unit DCU by the CAN bus;
Described urea-spray control unit DCU is used for the injection according to the described urea injecting quantity control urea that receives.
Preferably, also comprise: urea liquid level sensor, urea the first temperature transducer, baroceptor, urea temperature and pressure transmitter;
Described urea liquid level sensor is arranged in the urea box, for detection of the liquid level of urea in the urea box, and the urea level information that detects is directly sent to described ECU;
Described urea the first temperature transducer is arranged in the urea box, for detection of the temperature of urea in the urea box, and the urea temperature information that detects is directly sent to described ECU;
Described ECU sends to described DCU with the urea level information in the described urea box and urea temperature information by the CAN bus;
Described baroceptor is arranged on the urea pump, and for detection of the compressed-air actuated pressure behind the pressurized air process air-regulating valve, and this compressed-air actuated pressure information sends to described DCU;
Described urea temperature and pressure transmitter is arranged on the urea pump, for detection of the temperature and pressure of urea in the urea pump, and temperature information and pressure information is sent to described DCU;
Described DCU, according to the urea level information in the described urea box that receives, urea temperature information, pressure information, temperature information and compressed-air actuated pressure information with urea in the urea pump, judge whether to satisfy the condition of urea-spray, if satisfy, then send the urea injecting quantity signal to urea pump, the control urea pump is finished urea-spray by urea nozzle.
Preferably, described urea nozzle is integrated on the SCR catalytic muffler;
Described DCU and urea pump are assemblied on the described urea box;
Described DCU sends the urea injecting quantity signal to urea pump, and the control urea pump is finished the injection of described urea injecting quantity by urea nozzle.
Preferably, the ECU (Electrical Control Unit) ECU of described motor is used for calculating the urea injecting quantity that needs spray according to engine speed, circulation fuel injection amount, engine emission nitrous oxides concentration and exhaust gas flow; Be specially: described ECU reads the nitrous oxides concentration of motor according to engine speed and circulation fuel injection amount, and described engine speed, circulation fuel injection amount and nitrous oxides concentration form MAP figure, are to concern one to one between the three;
Described ECU is scaled nitrogen oxide mass flow by the nitrous oxides concentration that reads according to exhaust gas flow again, multiply by ammonia nitrogen than calculate the urea injecting quantity that needs injection divided by concentration of aqueous solution of urea again.
Preferably, also comprise: exhaust gas temperature sensor, the delivery temperature for measuring motor sends to described ECU with delivery temperature;
Described ECU is according to described delivery temperature corrected Calculation urea injecting quantity out, and revised urea injecting quantity is sent to described DCU by the CAN bus.
Compared with prior art, the present invention has the following advantages:
The method and system that the embodiment of the invention provides is finished the calculating of urea injecting quantity by ECU, and DCU only need to get final product according to the injection that the urea injecting quantity that ECU sends is carried out urea.Be that DCU only is final controlling element, no longer need to carry out the calculating of urea injecting quantity, correspondingly, the data relevant with urea injecting quantity also no longer receive, receive but turn by ECU, be the information that ECU receives nitrous oxides concentration and exhaust gas flow in engine speed, circulation fuel injection amount, the engine emission, ECU calculates according to the above data relevant with urea injecting quantity that receive.Like this, when switching after-treatment system when (comprising DCU), do not need the reprocessing data among the DCU are demarcated again, and can directly switch use, thereby realized the pattern of plug and play.For producing and follow-up management brings great convenience.
Description of drawings
Fig. 1 is method for urea injection control embodiment one flow chart of plug and play provided by the invention;
Fig. 2 is method for urea injection control embodiment two flow charts of plug and play provided by the invention;
Fig. 3 is urea-spray control system embodiment one schematic representation of plug and play provided by the invention;
Fig. 4 is urea-spray control system embodiment two schematic representation of plug and play provided by the invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.
In the prior art, DCU oneself calculates the urea injecting quantity that needs injection.Because the motor of same type different capacity section is corresponding a DCU all, is integrated with the reprocessing data among the DCU.The type of motor is more, and then the version of the reprocessing data among the DCU is also more.If carry out the switching of the after-treatment system (comprising DCU) of different model, then need the emissions data among the DCU after switching is demarcated again.To increase like this DCU staking-out work and roll off the production line and write with a brush dipped in Chinese ink the data management problem that (EOL) brings, bring simultaneously the alteration problems of after-treatment system data in the subsequent production process, make troubles to production.
The present invention is based on above deficiency of the prior art, a kind of method for urea injection control and system of new plug and play have been proposed, finish the calculating of urea injecting quantity by ECU, DCU only need to get final product according to the injection that the urea injecting quantity that ECU sends is carried out urea.Be that DCU only is final controlling element.Like this, when switching after-treatment system when (comprising DCU), do not need the reprocessing data among the DCU are demarcated again, and can directly switch use, thereby realized the pattern of plug and play.For producing and follow-up management brings great convenience.
Introduce in detail implementation of the present invention below in conjunction with accompanying drawing.
Referring to Fig. 1, this figure is method for urea injection control embodiment one flow chart of plug and play provided by the invention.
The method for urea injection control of the plug and play that present embodiment provides comprises:
S101: the ECU (Electrical Control Unit) ECU of motor calculates the urea injecting quantity that needs spray according to nitrous oxides concentration and exhaust gas flow in engine speed, circulation fuel injection amount, the engine emission; And the urea injecting quantity that calculates sent to urea-spray control unit DCU by the CAN bus;
Need to prove that described engine speed is measured by speed probe, speed probe directly sends to ECU with the engine speed of measuring.
Engine speed, circulation fuel injection amount and nitrous oxides concentration form MAP figure, are to concern one to one between the three.
Need to prove that MAP figure is the term of the control plotted curve in the motor.
Described ECU calculates the urea injecting quantity that needs spray according to nitrous oxides concentration and exhaust gas flow in engine speed, circulation fuel injection amount, the engine emission, is specially:
Described ECU reads the nitrous oxides concentration of motor according to engine speed and circulation fuel injection amount, and described engine speed, circulation fuel injection amount and nitrous oxides concentration form MAP figure, are to concern one to one between the three;
Described ECU is scaled nitrogen oxide mass flow by the nitrous oxides concentration that reads according to exhaust gas flow again, multiply by ammonia nitrogen than calculate the urea injecting quantity that needs injection divided by concentration of aqueous solution of urea again.
S102: described urea-spray control unit DCU is according to the injection of the described urea injecting quantity control urea that receives.
The method that the embodiment of the invention provides is finished the calculating of urea injecting quantity by ECU, and DCU only need to get final product according to the injection that the urea injecting quantity that ECU sends is carried out urea.Be that DCU only is final controlling element, no longer need to carry out the calculating of urea injecting quantity, correspondingly, the data relevant with urea injecting quantity also no longer receive, receive but turn by ECU, be the information that ECU receives nitrous oxides concentration and exhaust gas flow in engine speed, circulation fuel injection amount, the engine emission, ECU calculates according to the above data relevant with urea injecting quantity that receive.Like this, when switching after-treatment system when (comprising DCU), do not need the reprocessing data among the DCU are demarcated again, and can directly switch use, thereby realized the pattern of plug and play.For producing and follow-up management brings great convenience.
Referring to Fig. 2, this figure is method for urea injection control embodiment two flow charts of plug and play provided by the invention.
The embodiment's that present embodiment is corresponding with Fig. 1 difference is also to comprise before described DCU control urea-spray:
S201: described DCU is by liquid level information and the temperature information of urea in the urea box of CAN bus reception ECU transmission;
The pressure information of urea, temperature information and compressed-air actuated pressure in the urea pump that described DCU directly receives;
Described DCU is according to liquid level information, the temperature information of urea in the described urea box, and pressure information, temperature information, the compressed-air actuated pressure of urea judges whether to satisfy urea injection conditions in the urea pump; If satisfy, then described DCU is according to the injection of the described urea injecting quantity control urea that receives.
Need to prove, judge that the reason whether above condition satisfies is respectively:
Urea level information in the urea box is for judging whether urea box has enough urea to be transferred to urea pump;
The temperature information of urea is whether to reach-7 ℃ and then judge whether to start the heating function of urea box for the urea of judging urea box in the urea box;
The pressure information of urea is for judging whether the urea that urea pump pumps has enough pressure to reach urea nozzle in the urea pump;
Temperature information in the urea pump is for judging whether the urea that urea pump pumps reaches the freezing point of urea liquid and then judge whether to start heating function;
When only having the above-mentioned condition of judgement all to satisfy, DCU just controls injection urea.
Need to prove, if when DCU judgement urea injection conditions does not satisfy, then judge whether to satisfy always, when treating that urea injection conditions satisfies, just control urea-spray.
S102 in the present embodiment is specifically as follows: described DCU sends the urea injecting quantity signal to urea pump, and the control urea pump is finished urea-spray by urea nozzle.
Need to prove that more accurate for the urea injecting quantity that calculates, ECU also comprises, the urea injecting quantity that described ECU sprays according to delivery temperature correction needs after calculating the urea injecting quantity that needs to spray.
Delivery temperature is measured by exhaust gas temperature sensor and is obtained, and exhaust gas temperature sensor sends to described ECU with the delivery temperature of measuring.
Need to prove that in the above embodiment of the method, described ECU sends to described DCU by described CAN bus with the urea injecting quantity that calculates.
The method for urea injection control of the plug and play that the embodiment of the invention provides, ECU calculates urea injecting quantity, before dispatching from the factory, just demarcates by motor, DCU in the after-treatment system is equivalent to final controlling element, by the urea injecting quantity that the passive reception of CAN bus ECU sends, DCU is by demand injection urea at regular time and quantity.DCU self no longer needs to carry out calculating and the staking-out work of urea injecting quantity, can solve because DCU need to demarcate and roll off the production line and write with a brush dipped in Chinese ink the data management problem that (EOL) brings, and can realize the versatility of single automatically controlled data for different urea-spray systems.By the ECU unified management.Thereby can realize the versatility of whole after-treatment system under the different urea-spray system, reduce because component are numerous that the rate of fault that causes has further improved the adaptability of after-treatment system in car load mounting arrangements process.
Based on the method for urea injection control of above-mentioned plug and play, the present invention also provides the urea-spray control system of plug and play, describes its constituent element in detail below in conjunction with specific embodiment.
Referring to Fig. 3, this figure is urea-spray control system embodiment one schematic representation of plug and play provided by the invention.
The urea-spray control system of the plug and play that the embodiment of the invention provides comprises: the ECU (Electrical Control Unit) ECU302 of urea-spray control unit DCU301 and motor;
The ECU (Electrical Control Unit) ECU302 of described motor is used for calculating the urea injecting quantity that needs spray according to engine speed, circulation fuel injection amount, engine emission nitrous oxides concentration and exhaust gas flow; And the urea injecting quantity of described calculating sent to urea-spray control unit DCU301 by the CAN bus;
The ECU (Electrical Control Unit) ECU302 of described motor is used for calculating the urea injecting quantity that needs spray according to engine speed, circulation fuel injection amount, engine emission nitrous oxides concentration and exhaust gas flow; Be specially: described ECU302 reads the nitrous oxides concentration of motor according to engine speed and circulation fuel injection amount, and described engine speed, circulation fuel injection amount and nitrous oxides concentration form MAP figure, are to concern one to one between the three;
Described ECU302 is scaled nitrogen oxide mass flow by the nitrous oxides concentration that reads according to exhaust gas flow again, multiply by ammonia nitrogen than calculate the urea injecting quantity that needs injection divided by concentration of aqueous solution of urea again.
Described urea-spray control unit DCU301 is used for the injection according to the described urea injecting quantity control urea that receives.
The system that the embodiment of the invention provides finishes the calculating of urea injecting quantity by ECU302, and DCU301 only need to get final product according to the injection that the urea injecting quantity that ECU302 sends is carried out urea.Be that DCU301 only is final controlling element, no longer need to carry out the calculating of urea injecting quantity, correspondingly, the data relevant with urea injecting quantity also no longer receive, receive but turn by ECU302, be the information that ECU302 receives nitrous oxides concentration, exhaust gas flow and delivery temperature in engine speed, circulation fuel injection amount, the engine emission, ECU302 calculates according to the data relevant with urea injecting quantity that receive.Like this, when switching after-treatment system when (comprising DCU), do not need the reprocessing data among the DCU301 are demarcated again, and can directly switch use, thereby realized the pattern of plug and play.For producing and follow-up management brings great convenience.
Referring to Fig. 4, this figure is urea-spray control system embodiment two schematic representation of plug and play provided by the invention.
The urea-spray control system of the plug and play that present embodiment provides also comprises: urea liquid level sensor 300a, urea the first temperature transducer 300b, baroceptor 400a, urea temperature and pressure transmitter 400b;
Described urea liquid level sensor 300a is arranged in the urea box 300, for detection of the liquid level of urea in the urea box 300, and the urea level information that detects is directly sent to described ECU302;
Described urea the first temperature transducer 300b is arranged in the urea box 300, for detection of the temperature of urea in the urea box 300, and the urea temperature information that detects is directly sent to described ECU302;
Described ECU302 sends to described DCU301 with the urea level information in the described urea box 300 and urea temperature information by the CAN bus;
Described baroceptor 400a is arranged on the urea pump 400, and for detection of the compressed-air actuated pressure behind the pressurized air process air-regulating valve, and this compressed-air actuated pressure information sends to described DCU301;
Described urea temperature and pressure transmitter 400b is arranged on the urea pump 400, for detection of temperature information and the pressure of urea in the urea pump 400, and temperature, pressure information is sent to described DCU301;
Described DCU301, according to the urea level information in the described urea box that receives, urea temperature information, pressure information, temperature information and compressed-air actuated pressure information with urea in the urea pump, judge whether to satisfy the condition of urea-spray, if satisfy, then send the urea injecting quantity signal to urea pump 400, control urea pump 400 is finished urea-spray by urea nozzle 500.
Need to prove that this control system also comprises the CAN bus, described ECU301 sends to described DCU302 by described CAN bus with the urea injecting quantity that calculates.
In the present embodiment, described urea nozzle 500 is integrated on the SCR catalytic muffler 600.
Described DCU302 and urea pump 400 are assemblied on the described urea box 300.And the design that electric interfaces and pipeline connect has the characteristics of versatility, interchangeability and mistake proofing design, and this after-treatment system can be applicable to all engine model, is conducive to mounting arrangements and the reliability of after-treatment system on car load.
The urea-spray control system of plug and play provided by the invention, ECU calculates urea injecting quantity, before dispatching from the factory, just demarcates by motor, DCU in the after-treatment system is equivalent to final controlling element, by the urea injecting quantity that the passive reception of CAN bus ECU sends, DCU is by demand injection urea at regular time and quantity.DCU self no longer needs to carry out calculating and the staking-out work of urea injecting quantity, can solve because DCU need to demarcate and roll off the production line and write with a brush dipped in Chinese ink the data management problem that (EOL) brings, and can realize the versatility of single automatically controlled data for different urea-spray systems.By the ECU unified management.Thereby can realize the versatility of whole after-treatment system under the different urea-spray system, reduce because component are numerous that the rate of fault that causes has further improved the adaptability of after-treatment system in car load mounting arrangements process.
For the accuracy of the urea injecting quantity that improves calculating, exhaust gas temperature sensor 800 is used for measuring the delivery temperature of motor, and delivery temperature is sent to described ECU302; As shown in Figure 4.
Described ECU302 is according to described delivery temperature corrected Calculation urea injecting quantity out, and revised urea injecting quantity is sent to described DCU301 by the CAN bus.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Although the present invention discloses as above with preferred embodiment, yet is not to limit the present invention.Any those of ordinary skill in the art, do not breaking away from the technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention according to any simple modification, equivalent variations and the modification that technical spirit of the present invention is done above embodiment, all still belongs in the scope of technical solution of the present invention protection.
Claims (10)
1. the method for urea injection control of a plug and play is characterized in that, comprising:
The ECU (Electrical Control Unit) ECU of motor calculates the urea injecting quantity that needs spray according to nitrous oxides concentration and exhaust gas flow in engine speed, circulation fuel injection amount, the engine emission; And the urea injecting quantity that calculates sent to urea-spray control unit DCU by the CAN bus;
Described urea-spray control unit DCU is according to the injection of the described urea injecting quantity control urea that receives.
2. the method for urea injection control of plug and play according to claim 1 is characterized in that, also comprises before described DCU control urea-spray:
Described DCU is by liquid level information and the temperature information of urea in the urea box of CAN bus reception ECU transmission;
The pressure information of urea, temperature information and compressed-air actuated pressure in the urea pump that described DCU directly receives;
Described DCU is according to liquid level information, the temperature information of urea in the described urea box, and pressure information, temperature information, the compressed-air actuated pressure of urea judges whether to satisfy urea injection conditions in the urea pump; If satisfy, then described DCU is according to the injection of the described urea injecting quantity control urea that receives.
3. the method for urea injection control of plug and play according to claim 2, it is characterized in that, described urea-spray control unit DCU is according to the injection of the described urea injecting quantity control urea that receives, be specially: described DCU sends the urea injecting quantity signal to urea pump, and the control urea pump is finished the injection of described urea injecting quantity by urea nozzle.
4. the method for urea injection control of plug and play according to claim 1, it is characterized in that, described ECU calculates the urea injecting quantity that needs spray according to nitrous oxides concentration and exhaust gas flow in engine speed, circulation fuel injection amount, the engine emission, is specially:
Described ECU reads the nitrous oxides concentration of motor according to engine speed and circulation fuel injection amount, and described engine speed, circulation fuel injection amount and nitrous oxides concentration form MAP figure, are to concern one to one between the three;
Described ECU is scaled nitrogen oxide mass flow by the nitrous oxides concentration that reads according to exhaust gas flow again, multiply by ammonia nitrogen than calculate the urea injecting quantity that needs injection divided by concentration of aqueous solution of urea again.
5. the method for urea injection control of plug and play according to claim 1 is characterized in that, after calculating the urea injecting quantity that needs to spray, also comprises the urea injecting quantity that described ECU sprays according to delivery temperature correction needs.
6. the urea-spray control system of a plug and play is characterized in that, comprising: the ECU (Electrical Control Unit) ECU of urea-spray control unit DCU and motor;
The ECU (Electrical Control Unit) ECU of described motor is used for calculating the urea injecting quantity that needs spray according to engine speed, circulation fuel injection amount, engine emission nitrous oxides concentration and exhaust gas flow; And the urea injecting quantity of described calculating sent to urea-spray control unit DCU by the CAN bus;
Described urea-spray control unit DCU is used for the injection according to the described urea injecting quantity control urea that receives.
7. the urea-spray control system of plug and play according to claim 6 is characterized in that, also comprises: urea liquid level sensor, urea the first temperature transducer, baroceptor, urea temperature and pressure transmitter;
Described urea liquid level sensor is arranged in the urea box, for detection of the liquid level of urea in the urea box, and the urea level information that detects is directly sent to described ECU;
Described urea the first temperature transducer is arranged in the urea box, for detection of the temperature of urea in the urea box, and the urea temperature information that detects is directly sent to described ECU;
Described ECU sends to described DCU with the urea level information in the described urea box and urea temperature information by the CAN bus;
Described baroceptor is arranged on the urea pump, and for detection of the compressed-air actuated pressure behind the pressurized air process air-regulating valve, and this compressed-air actuated pressure information sends to described DCU;
Described urea temperature and pressure transmitter is arranged on the urea pump, for detection of the temperature and pressure of urea in the urea pump, and temperature information and pressure information is sent to described DCU;
Described DCU, according to the urea level information in the described urea box that receives, urea temperature information, pressure information, temperature information and compressed-air actuated pressure information with urea in the urea pump, judge whether to satisfy the condition of urea-spray, if satisfy, then send the urea injecting quantity signal to urea pump, the control urea pump is finished urea-spray by urea nozzle.
8. according to claim 6 or the urea-spray control system of 7 described plug and play, it is characterized in that described urea nozzle is integrated on the SCR catalytic muffler;
Described DCU and urea pump are assemblied on the described urea box;
Described DCU sends the urea injecting quantity signal to urea pump, and the control urea pump is finished the injection of described urea injecting quantity by urea nozzle.
9. according to claim 6 or the urea-spray control system of 7 described plug and play, it is characterized in that, the ECU (Electrical Control Unit) ECU of described motor is used for calculating the urea injecting quantity that needs spray according to engine speed, circulation fuel injection amount, engine emission nitrous oxides concentration and exhaust gas flow; Be specially: described ECU reads the nitrous oxides concentration of motor according to engine speed and circulation fuel injection amount, and described engine speed, circulation fuel injection amount and nitrous oxides concentration form MAP figure, are to concern one to one between the three;
Described ECU is scaled nitrogen oxide mass flow by the nitrous oxides concentration that reads according to exhaust gas flow again, multiply by ammonia nitrogen than calculate the urea injecting quantity that needs injection divided by concentration of aqueous solution of urea again.
10. the urea-spray control system of plug and play according to claim 6 is characterized in that, also comprises: exhaust gas temperature sensor, and the delivery temperature for measuring motor sends to described ECU with delivery temperature;
Described ECU is according to described delivery temperature corrected Calculation urea injecting quantity out, and revised urea injecting quantity is sent to described DCU by the CAN bus.
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Application publication date: 20130417 Assignee: Weichai Power Air Purification Technology Co. Ltd. Assignor: Weichai Dynamic Co., Ltd. Contract record no.: 2015990000854 Denomination of invention: Plug-and-play urea spraying control method and system Granted publication date: 20141210 License type: Exclusive License Record date: 20151015 |
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