CN102808680A - Control method for SCR system low-temperature thawing - Google Patents
Control method for SCR system low-temperature thawing Download PDFInfo
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- CN102808680A CN102808680A CN2012102945603A CN201210294560A CN102808680A CN 102808680 A CN102808680 A CN 102808680A CN 2012102945603 A CN2012102945603 A CN 2012102945603A CN 201210294560 A CN201210294560 A CN 201210294560A CN 102808680 A CN102808680 A CN 102808680A
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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
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Abstract
The invention discloses a control method for SCR system low-temperature thawing. The SCR system includes a urea pump and a urea pipe. The method is as follows: 11) selecting at least one of the urea pump and the urea pipe as the detection object, detecting the temperature of the detection object, and judging whether the detected temperature is lower than the thawing preset temperature of the detection object, and if the result is positive, the first condition for the detection object thawing is met; and detecting the temperature in the urea box and calculating the thawing delay time of the detection object based on the detected temperature, and judging whether the thawing completion time of the urea box is no less than the thawing delay time of the detection object, and if the result is positive, the second condition of the detection object thawing is met; 12) judging whether the first and second conditions of the detection object thawing are both met, if the result is positive, the thawing program is started for the detection object to complete thawing; and 13) and starting the heating program for the detection object to complete heating. The control method can reduce the heating power consumption of the SCR system during the cold start of the engine.
Description
Technical field
The present invention relates to the SCR system, particularly relate to the controlling method that a kind of SCR system hypothermia thaws.
Background technique
Along with the requirement of countries in the world to the continuous strictness of engine emission rules, the engine exhaust post-processing technology is constantly development also.China will implement state IV Abgasgesetz on July 1st, 2013, and in order to satisfy the restriction of state IV Abgasgesetz to soot and nitrogen oxide, motor mainly utilizes SCR (SCR) system to reduce the discharging of nitrogen oxide.
The SCR system mainly is divided into control unit, urea dosage device and catalytic reaction unit three parts according to function; Wherein the control unit of the control unit of SCR and motor (ECU) integrates; Be used to carry out the SCR control strategy; And according to sensor signals such as ambient temperature, delivery temperature, urea level, urea temperature, urea pressure, nitrous oxides concentration control urea dosage device, thereby at regular time and quantity spraying urea liquid is mapped in the exhaust airstream by demand; The urea dosage device mainly comprises urea box, urea supply unit, urea-spray unit, heating module and connecting pipeline and circuit, guarantees the abundant atomizing and the decomposition of urea liquid; The catalytic reaction unit mainly comprises SCR catalyzer, carrier and encapsulation thereof, is used for the main harmful components nitrogen oxide of diesel exhaust gas is reduced to the nitrogen G&W.
The basic functional principle of SCR system sprays into quantitative aqueous solution of urea in the outlet pipe with vaporific form for the urea-spray unit; Urea droplets issues in the high-temp waste gas effect that unboiled water is separated and pyrolytic reaction; Produce required reducing agent ammonia, ammonia is reduced to nitrogen with nitrogen oxide selectively under catalyst action.
The physical property of urea has determined it will freeze at-11 ℃; So in actual motion; In order to guarantee also can proper functioning, need guarantee that urea can normally circulate to the heating of thawing of urea box, urea pump and urea pipe than SCR system under the low ambient temperature.
The heating measure that existing technology adopts is described below: when vehicle when low temperature environment moves; If the urea box temperature transducer records temperature and is lower than specified value (generally being set at 0 ℃); Engine electric-controlled unit can send instruction and open the cooling liquid pipeline control electromagnetic valve that motor leads to urea box; Utilize the cooling liquid of motor to heat, prevent the urea liquid frozen urea liquid that freezes or thaw, guarantee the exhaust after treatment system proper functioning to urea box.When the urea liquid temperature rises to specified value (generally being set at about 5 ℃), then break off control electromagnetic valve, prevent that urea liquid is overheated.
Urea pump to thaw with temperature in the pump be benchmark, be lower than specified value (8 ℃) when the internal ambient temperature sensor of urea pump records temperature, and after the lasting regular hour (4s), urea pump begins to thaw.Be higher than specified value (8 ℃) when the urea pump internal temperature sensor records temperature, and after the lasting regular hour (1s), the urea completion of thawing gets into heated condition.When ambient temperature less than specified value (2 ℃), urea pump begin the heating.When ambient temperature greater than specified value (0 ℃), urea pump is accomplished heating.
The urea pipe to thaw with the ambient temperature be benchmark; According to current environmental temperature; Calculate the needed time of urea pipe of thawing,, think the completion of thawing as long as when the time of the accumulative total of thawing reaches needed time; System gets into heated condition, and system judges according to current environmental temperature whether current heating begins or finish.
The SCR system at low temperatures whether can proper functioning depends on the completion that whether unfreezes all of urea box, urea pump and urea pipe.Because the mode of heating that thaws of urea box is the water heating, it is bigger influenced by engine water temperature, and the urea box volume is bigger, and the mode of heating that thaws of urea pump and urea pipe is electric heating, so general the thawing faster than urea box of thawing of urea pump and urea pipe.Show that through low temperature thawing test empirical value urea box thaws and consuming timely is respectively 3.6 times and 1.9 times that urea pump, urea pipe thaw consuming time.Ambient temperature is similar to ambient temperature in the urea pump; So can think that thawing of urea pump is as the criterion with ambient temperature, thawing of urea pipe also is as the criterion with ambient temperature, as long as ambient temperature is lower than specified value and just begins to thaw; Thaw and promptly get into repetitive heating-stop-heated condition after accomplishing; And the success of thawing also of urea box at this moment, so caused when waiting for that urea box thaws success electrically heated energy dissipation; Vehicle accumulator electric weight when having consumed cold start-up, thus carrying out smoothly of cold start-up influenced.
Therefore, the controlling method that how to provide a kind of SCR system hypothermia to thaw can reduce SCR system heating power consumption under the low temperature, reduces energy dissipation, is the present technical issues that need to address of those skilled in the art.
Summary of the invention
The purpose of this invention is to provide the controlling method that a kind of SCR system hypothermia thaws, can reduce SCR system heating power consumption under the low temperature, reduce energy dissipation.
For solving the problems of the technologies described above, the controlling method that the present invention provides a kind of SCR system hypothermia to thaw, SCR system comprise urea pump and urea pipe, and said method step is following:
11) choose at least urea pump and urea pipe in the two one as detected object, the thaw preset temperature corresponding with detected object prestores; Detect the temperature of detected object, and judge whether the temperature that detects is lower than the thaw preset temperature corresponding with detected object, if then satisfy the first condition that detected object thaws;
Detect urea the temperature inside the box and calculate thawing retard time of detected object based on measured temperature, judge urea box thawing time whether be not less than thawing retard time of detected object, if satisfy the second condition that detected object thaws;
12) judge whether first condition and second condition that detected object thaws all satisfy, if detected object gets into the thaw routine completion and thaws;
13) detected object gets into heating schedule and accomplishes heating.
Preferably, in the step 11), prestore and detected object corresponding preset water temperature;
Further may further comprise the steps between step 11) and the said step 12):
111) detection of engine water temperature judges whether engine water temperature is higher than and detected object corresponding preset water temperature, if satisfy the 3rd condition that detected object thaws;
In the step 12), judge whether first condition, second condition and the 3rd condition that detected object thaws all satisfy, if detected object gets into the thaw routine completion and thaws.
Preferably, in the said step 11), the low temperature corresponding with detected object that prestores continues Preset Time; The temperature of detected object is if be lower than the corresponding with it preset temperature that thaws; Record detected object temperature is lower than the endurance of the corresponding with it preset temperature that thaws; Judge whether this endurance surpasses corresponding with it low temperature and continue Preset Time; If then satisfy the first condition that detected object thaws.
Preferably, the detected object in the step 11) comprises urea pump, and the thaw completion preset temperature corresponding with urea pump prestores; When detecting the urea pump temperature, detect the interior temperature of pump of urea pump;
After urea pump gets into thaw routine in the step 12), when temperature in the urea pump is higher than corresponding with it thawing and accomplishes preset temperature, the urea pump completion of thawing.
Preferably, in the step 11), the Preset Time that thaws of the urea pump that prestores;
In the step 12); If temperature is higher than corresponding with it thawing when accomplishing preset temperature in the urea pump, record urea pump temperature is higher than corresponding with it thawing to be accomplished the endurance of preset temperature, judges whether this endurance surpasses the Preset Time that thaws of urea pump; If, the urea pump completion of thawing.
Preferably, the detected object in the step 11) comprises the urea pipe, when detecting urea pipe temperature, detects the ambient temperature of urea pipe;
In the step 12), after the urea pipe gets into thaw routine, calculate the urea pipe needed time that thaws, surpass when thawing urea pipe needed time, the completion of thawing of urea pipe when urea pipe Cumulative time of thawing based on the current environmental temperature that detects.
Preferably, in the step 11), the heating preset temperature that prestores corresponding with detected object;
In the step 13), if when the temperature of detected object is higher than corresponding with it heating preset temperature, then heating is accomplished.
Preferably, in the step 11), the heating Preset Time that prestores corresponding with detected object;
In the step 13); When if the temperature of detected object is higher than corresponding with it heating completion preset temperature; Record detected object temperature is higher than the endurance that preset temperature is accomplished in corresponding with it heating; And judge whether this endurance be higher than with it corresponding heating Preset Time, if the detected object heating is accomplished.
Above-mentioned background is technological relatively; At least one is as detected object in the two with urea pump and urea pipe for SCR system hypothermia unfreezing control method provided by the present invention, and the control of thawing has added based on the time of urea box temperature and revises to its low temperature, and the low temperature of promptly calculating detected object based on the urea box thermometer thaws retard time; After urea box thawing time is greater than the thaw retard time corresponding with detected object; Detected object gets into thaw routine and thaws, and gets into the heating schedule heating at last, thereby has avoided when urea box does not also thaw success; Detected object thawed success and repetitive heating-stop-heating; Reduced detected object and added the energy dissipation that the hot standby urea box thaws, SCR system heating power consumption has guaranteed carrying out smoothly of engine cold-start when having reduced engine cold-start.
A kind of preferred embodiment in; The present invention has further increased the engine water temperature restrictive condition on the time modified basis based on the urea box temperature; Because it is bigger that the urea box thawing time is influenced by engine water temperature; After adding the engine water temperature restrictive condition, can calculate thawing retard time of detected object more accurately, further reduce the energy dissipation that detected object is waited for repetitive heating when urea box thaws.
Description of drawings
Fig. 1 is thaw first kind of embodiment's control logic figure of SCR system hypothermia provided by the present invention;
Fig. 2 is thaw second kind of embodiment's control logic figure of SCR system hypothermia provided by the present invention;
Fig. 3 is thaw the third embodiment's control logic figure of SCR system hypothermia provided by the present invention;
Fig. 4 is thaw the 4th kind of embodiment's control logic figure of SCR system hypothermia provided by the present invention;
Fig. 5 is thaw the 5th kind of embodiment's control logic figure of SCR system hypothermia provided by the present invention;
Fig. 6 is thaw the 6th kind of embodiment's control logic figure of SCR system hypothermia provided by the present invention.
Embodiment
Core of the present invention provides the controlling method that a kind of SCR system hypothermia thaws, and can reduce SCR system heating power consumption under the low temperature, reduces energy dissipation.
In order to make those skilled in the art person understand the present invention program better, the present invention is done further detailed description below in conjunction with accompanying drawing and embodiment.
Please refer to Fig. 1, Fig. 1 is thaw first kind of embodiment's control logic figure of SCR system hypothermia provided by the present invention.
In first kind of embodiment, the controlling method that SCR system hypothermia provided by the present invention thaws comprises the steps:
Step S11: the preset temperature that thaws of the urea pump that prestores; Detect temperature in the urea pump, and judge whether measured temperature is lower than the preset temperature that thaws of urea pump, if satisfy the first condition that urea pump thaws;
Detect urea the temperature inside the box and calculate thawing retard time of urea pump based on measured temperature, judge urea box thawing time whether be not less than thawing retard time of urea pump, if satisfy the second condition that urea pump thaws.
Wherein, the first condition that urea pump thaws is that urea pump objectively need thaw, and freezes in order to prevent the urea liquid in the urea pump; The second condition that urea pump thaws is when urea pump begins to thaw, and is the control to the urea pump thawing time.
Step S12: judge whether first condition and second condition that urea pump thaws all satisfy, if urea pump gets into the thaw routine completion and thaws.
When having only the first condition that thaws when urea pump and second condition all to satisfy, urea pump just gets into thaw routine and accomplishes and thaw.All cannot get into thaw routine if having only first condition to satisfy or have only second condition to satisfy, need to continue to detect temperature and urea box thawing time in the urea pump, so that continue to do two judgements whether thawing condition is set up, until the entering thaw routine.
Step S13: urea pump gets into heating schedule and accomplishes heating.
Thaw or accomplish heating in order to guarantee that urea pump can be accomplished, the urea pump that can in step S11, further prestore thaws and accomplishes preset temperature and urea pump heating completion preset temperature.
At this moment, among the step S12, after urea pump gets into thaw routine,, temperature in the urea pump thaws when accomplishing preset temperature the urea pump completion of thawing when being higher than urea pump.
At this moment, among the step S13, after urea pump got into heating schedule, when temperature in the urea pump was higher than urea pump heating completion preset temperature, the urea pump heating was accomplished.
Promptly thaw and accomplish preset temperature and urea pump heating completion preset temperature, for thawing and heat a judging standard setting up finishing stage, thaw or heat so that guarantee that urea pump can be accomplished through the urea pump that prestores.Urea pump thaws and accomplishes preset temperature and can obtain according to modes such as experiment, emulation, theoretical calculation with setting up of preset temperature of urea pump heating completion.Certainly, also can guarantee that urea pump is accomplished and thaw and heat that such as time qualified etc., to urea pump, the mode of temperature qualification is more suitable for accurate and direct clear and definite urea pump and whether accomplishes and thaw and heat in the pump through other modes.
In the foregoing description; Owing in the low temperature of urea pump thaws control logic, added the time correction, calculate urea pump through thermometer in the urea box and thaw retard time based on what urea box thawed, make the delay of thawing of urea pump; Thereby avoided urea pump not accomplish when thawing because of urea box; Urea pump has thawed accomplish to get into and has heated-stop-circulation repeatedly of heating, and then has reduced the waste of urea pump heat energy, the heating power consumption of SCR system when having reduced cold start-up.
Thermometry in above-mentioned each step all can realize through being provided with of temperature transducer; Because thermometry realizes through temperature transducer, malfunctioning or error occurs for fear of temperature transducer in the course of the work, control thawing and heating of urea pump more accurately.Can make further improvement to the judgement in above-mentioned each step.
In step S11, the low temperature of the urea pump that prestores continues Preset Time; When temperature in the urea pump is lower than thawing during preset temperature of urea pump; Temperature is lower than the endurance of its preset temperature that thaws in the record urea pump; Judge that whether this endurance is above the lasting Preset Time of the low temperature of urea pump, if then satisfy the first condition that urea pump thaws.
In step S11, the Preset Time that thaws of the urea pump that prestores; Among the step S12; If temperature is higher than thawing when accomplishing preset temperature of urea pump in the urea pump, record urea pump temperature is higher than it thaws the endurance of completion preset temperature, and judges whether this endurance surpasses the Preset Time that thaws of urea pump; If, the urea pump completion of thawing.
In step S11, the heating Preset Time of the urea pump that prestores; Among the step S13; If when temperature was higher than the heating completion preset temperature of urea pump in the urea pump, record urea pump temperature was higher than its heating and accomplishes the endurance of preset temperature, and judged whether this endurance surpasses the heating Preset Time of urea pump; If the urea pump heating is accomplished.
With reference to figure 2, Fig. 2 is thaw second kind of embodiment's control logic figure of SCR system hypothermia provided by the present invention.
In second kind of embodiment, the controlling method that SCR system hypothermia provided by the present invention thaws comprises the steps:
Step S21: the preset temperature that thaws of the urea pipe that prestores; Detect the ambient temperature of urea pipe, and judge whether measured temperature is lower than the preset temperature that thaws of urea pipe, if satisfy the first condition that urea pump thaws;
Detect urea the temperature inside the box and calculate thawing retard time of urea pipe based on measured temperature, judge urea box thawing time whether be not less than thawing retard time of urea pipe, if satisfy the second condition that the urea pipe thaws.
Wherein, the first condition that the urea pipe thaws is that the urea pipe objectively need thaw, and freezes in order to prevent the urea liquid in the urea pipe; The second condition that the urea pipe thaws is when the urea pipe begins to thaw, and is the control to urea pipe thawing time.
It is pointed out that thawing of urea pipe is benchmark with the ambient temperature preferably, judge whether the urea pipe need thaw so detect the ambient temperature of urea pipe among this embodiment.
Step S22: judge whether first condition and second condition that the urea pipe thaws all satisfy, if the urea pipe gets into the thaw routine completion and thaws.
When having only the first condition that thaws when the urea pipe and second condition all to satisfy, the urea pipe just gets into thaw routine and accomplishes and thaw.If have only first condition to satisfy or have only second condition to satisfy and all cannot get into thaw routine; The ambient temperature of needs continuation detection urea pipe and urea box be thawing time; So that continue to do two judgements whether thawing condition is set up, until getting into thaw routine.
Particularly, after the urea pipe gets into thaw routine, calculate the urea pipe needed time that thaws, surpass when thawing urea pipe needed time, the completion of thawing of urea pipe when urea pipe Cumulative time of thawing based on the current environmental temperature that detects.
Step S23: the urea pipe gets into heating schedule and accomplishes heating.
Can accomplish heating, the urea pipe that can in step S21, further prestore heating completion preset temperature in order to guarantee the urea pipe; Among the step S23, after the urea pipe got into heating schedule, when the ambient temperature of urea pipe was higher than urea pipe heating completion preset temperature, the heating of urea pipe was accomplished.The principle of this step and above-mentioned urea pump embodiment's principle is similar, repeats no more here.
Owing in the low temperature of urea pipe thaws control logic, added the time correction; Calculating the urea pipe through thermometer in the urea box thaws retard time based on what urea box thawed; Make the delay of thawing of urea pipe, thereby avoid the urea pipe not accomplish when thawing because of urea box, the urea pipe has thawed to accomplish to get into and has heated-stop-circulation repeatedly of heating; And then the waste of urea pipe heat energy, the heating power consumption of SCR system when having reduced cold start-up have been reduced.
Thermometry in above-mentioned each step is to realize through being provided with of temperature transducer equally; Because thermometry realizes through temperature transducer, malfunctioning or error occurs for fear of temperature transducer in the course of the work, control thawing and heating of urea pipe more accurately.Can make further improvement to the judgement in above-mentioned each step.
In step S21, the low temperature of the urea pipe that prestores continues Preset Time; When the ambient temperature of urea pipe is lower than thawing during preset temperature of urea pipe; The ambient temperature of record urea pipe is lower than the endurance of its preset temperature that thaws; Judge this endurance whether surpass the urea pipe low temperature continue Preset Time, if then satisfy the first condition that the urea pipe thaws.
In step S21, the heating Preset Time of the urea pipe that prestores; Among the step S23; When if the ambient temperature of urea pipe is higher than the heating completion preset temperature of urea pipe, the ambient temperature of record urea pipe is higher than its heating and accomplishes the endurance of preset temperature, and judges whether this endurance surpasses the heating Preset Time of urea pipe; If the heating of urea pipe is accomplished.
With reference to figure 3, Fig. 3 is thaw the third embodiment's control logic figure of SCR system hypothermia provided by the present invention.
In the third embodiment; The SCR system thaws to the low temperature of urea pump and urea pipe and revises simultaneously; After detecting urea the temperature inside the box; Calculating thaw retard time and urea pipe of urea pump simultaneously based on this temperature thaws retard time; The concrete steps that urea pump and urea pipe low temperature thaw respectively with above-mentioned first kind of embodiment in urea pump low temperature the thaw concrete steps controlled of control and urea pipe low temperature among second kind of embodiment of thawing similar, be equivalent to first embodiment and second embodiment carries out simultaneously, repeat no more here.
Hence one can see that, the controlling method that SCR system hypothermia provided by the invention thaws, need choose at least urea pump and urea pipe in the two one as detected object; Among first embodiment, choose urea pump as detected object; Among second embodiment, choose the urea pipe as detected object; Among the 3rd embodiment, urea pump and urea Guan Jun are as detected object.After detected object is confirmed, can detect the temperature of detected object accordingly, according to the urea pump characteristics, can detect the interior temperature of its pump is the temperature of urea pump, according to the characteristic of urea pipe, can detect the temperature of its ambient temperature as the urea pipe; And parameters such as all kinds of preset temperatures mentioned in the foregoing description corresponding with detected object, Preset Time can be set, in order to using in the control procedure of thawing.
Revise owing to simultaneously the low temperature of the urea pump of SCR system and urea pipe is thawed; Realize thawing simultaneously completion so can make urea pump, urea pipe and urea box; Avoided urea pump and urea pipe not to accomplish when thawing because of urea box, urea pump and urea pipe have thawed to accomplish to get into and have heated-stop-circulation repeatedly of heating, and then have reduced the waste of urea pump and urea pipe heat energy; Compare with second kind of embodiment with first kind of embodiment, further reduced the waste of heat energy.
Because the mode of heating of urea box is the water heating; Promptly when urea box need heat; Engine electric-controlled unit sends instruction and opens the cooling liquid pipeline control electromagnetic valve that motor leads to urea box; Utilize the cooling liquid of motor to heat, so the thawing time of urea box also receives the influence of engine water temperature to urea box.If engine water temperature is lower, then thawing of urea box needs the longer time, for the heating of thawing of control detection object more accurately, can be further in the low temperature of detected object thaws control introducing engine water temperature restrictive condition.The detected object here comprises urea pump and urea pipe.
Please refer to Fig. 4, Fig. 4 is thaw the 4th kind of embodiment's control logic figure of SCR system hypothermia provided by the present invention.
In the 4th kind of embodiment, the controlling method that SCR system hypothermia provided by the present invention thaws comprises the steps:
Step S31: the preset temperature that thaws of the urea pump that prestores; Detect temperature in the urea pump, and judge whether measured temperature is lower than the preset temperature that thaws of urea pump, if satisfy the first condition that urea pump thaws;
Detect urea the temperature inside the box and calculate thawing retard time of urea pump based on measured temperature, judge urea box thawing time whether be not less than thawing retard time of urea pump, if satisfy the second condition that urea pump thaws.
The preset water temperature of urea pump prestores; The detection of engine water temperature judges whether engine water temperature is higher than the preset water temperature of urea pump, if satisfy the 3rd condition that urea pump thaws.
Step S32: judge whether first condition, second condition and the 3rd condition that urea pump thaws all satisfy, if urea pump gets into the thaw routine completion and thaws.
Step S33: urea pump gets into heating schedule and accomplishes heating.
In this embodiment; The low temperature of urea pump thawed further introduced the restrictive condition of engine water temperature; Be that urea pump gets into thaw routine except receiving temperature conditions and time restriction, also receive the restriction of engine water temperature, promptly on first kind of embodiment's basis, revised the influence that the variation of urea box thawing time is thawed to urea pump low temperature; The low temperature of having controlled urea pump more accurately thaws; Can further reduce urea pump and add the energy dissipation that the hot standby urea box thaws, SCR system heating power consumption ensures carrying out smoothly of cold start-up when reducing cold start-up.
In this embodiment, except in step S31, having added the restrictive condition of engine water temperature, the thaw routine of urea pump and heating schedule all with similar described in first kind of embodiment, repeat no more at this.
Need to prove that the preset water temperature of above-mentioned urea pump is the engine water temperature critical value of thawing to urea pump.
With reference to figure 5, Fig. 5 is thaw the 5th kind of embodiment's control logic figure of SCR system hypothermia provided by the present invention.
In the 5th kind of embodiment, the controlling method that SCR system hypothermia provided by the present invention thaws comprises the steps:
Step S41: the preset temperature that thaws of the urea pipe that prestores; Detect the ambient temperature of urea pipe, and judge whether measured temperature is lower than the preset temperature that thaws of urea pipe, if satisfy the first condition that the urea pipe thaws;
Detect urea the temperature inside the box and calculate thawing retard time of urea pipe based on measured temperature, judge urea box thawing time whether be not less than thawing retard time of urea pipe, if satisfy the second condition that the urea pipe thaws.
The preset water temperature of urea pipe prestores; The detection of engine water temperature judges whether engine water temperature is higher than the preset water temperature of urea pipe, if satisfy the 3rd condition that the urea pipe thaws.
Step S42: judge whether first condition, second condition and the 3rd condition that the urea pipe thaws all satisfy, if the urea pipe gets into the thaw routine completion and thaws.
Step S43: the urea pipe gets into heating schedule and accomplishes heating.
In this embodiment; The low temperature of urea pipe thawed further introduced the restrictive condition of engine water temperature; The variation of promptly on second kind of embodiment's basis, having revised the urea box thawing time is to the influence that urea pipe low temperature thaws, and the low temperature of having controlled the urea pipe more accurately thaws, and can further reduce the urea pipe and add the energy dissipation that the hot standby urea box thaws; SCR system heating power consumption ensures carrying out smoothly of cold start-up when reducing cold start-up.
The preset water temperature that it is pointed out that above-mentioned urea pipe is the engine water temperature critical value of thawing to the urea pipe.
In this embodiment, except in step S41, having added the restrictive condition of engine water temperature, the thaw routine of urea pipe and heating schedule all with similar described in second kind of embodiment, repeat no more at this.
With reference to figure 6, Fig. 6 is thaw the 6th kind of embodiment's control logic figure of SCR system hypothermia provided by the present invention.
In the 6th kind of embodiment; The SCR system thaws to the low temperature of urea pump and urea pipe and revises simultaneously; The concrete steps that its urea pump and urea pipe low temperature thaw respectively with above-mentioned the 4th kind of embodiment in urea pump low temperature the thaw concrete steps controlled of control and urea pipe low temperature among the 5th kind of embodiment of thawing similar; Be equivalent to the 4th embodiment and the 5th embodiment carries out simultaneously, repeat no more here.
Revise owing to simultaneously the low temperature of the urea pump of SCR system and urea pipe is thawed, so compare with the 5th kind of embodiment with the 4th kind of embodiment, the 6th kind of embodiment can further reduce the waste of heat energy, the carrying out smoothly of guarantee cold start-up.
Here need to prove that urea pump is different with the thawing mode of urea pipe, the logic of accomplishing is judged also different so it thaws; Likewise, mode of heating is different, and the logic that its heating is accomplished is judged also different.When real work, can choose different thawing modes and mode of heating and the corresponding logic of thawing as required and judge and the judgement of heating logic.
Also need to prove, is that calibration result according to existing test draws based on the calculating of retard time of thawing of the urea pump of urea box temperature or urea pipe, certainly, also can take other modes to draw, like theoretical calculation etc.
More than controlling method that SCR system hypothermia provided by the present invention is thawed carried out detailed introduction.Used concrete example among this paper principle of the present invention and mode of execution are set forth, above embodiment's explanation just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (8)
1. controlling method that the SCR system hypothermia thaws, the SCR system comprises urea pump and urea pipe, said method step is following:
11) choose at least urea pump and urea pipe in the two one as detected object, the thaw preset temperature corresponding with detected object prestores; Detect the temperature of detected object, and judge whether the temperature that detects is lower than the thaw preset temperature corresponding with detected object, if then satisfy the first condition that detected object thaws;
Detect urea the temperature inside the box and calculate thawing retard time of detected object based on measured temperature, judge urea box thawing time whether be not less than thawing retard time of detected object, if satisfy the second condition that detected object thaws;
12) judge whether first condition and second condition that detected object thaws all satisfy, if detected object gets into the thaw routine completion and thaws;
13) detected object gets into heating schedule and accomplishes heating.
2. the controlling method that SCR system hypothermia as claimed in claim 1 thaws is characterized in that, in the step 11), prestores and detected object corresponding preset water temperature;
Further may further comprise the steps between step 11) and the said step 12):
111) detection of engine water temperature judges whether engine water temperature is higher than and detected object corresponding preset water temperature, if satisfy the 3rd condition that detected object thaws;
In the step 12), judge whether first condition, second condition and the 3rd condition that detected object thaws all satisfy, if detected object gets into the thaw routine completion and thaws.
3. according to claim 1 or claim 2 the SCR system hypothermia controlling method of thawing is characterized in that in the said step 11), the low temperature corresponding with detected object that prestores continues Preset Time; The temperature of detected object is if be lower than the corresponding with it preset temperature that thaws; Record detected object temperature is lower than the endurance of the corresponding with it preset temperature that thaws; Judge whether this endurance surpasses corresponding with it low temperature and continue Preset Time; If then satisfy the first condition that detected object thaws.
4. according to claim 1 or claim 2 the SCR system hypothermia controlling method of thawing is characterized in that,
Detected object in the step 11) comprises urea pump, and the thaw completion preset temperature corresponding with urea pump prestores; When detecting the urea pump temperature, detect the interior temperature of pump of urea pump;
After urea pump gets into thaw routine in the step 12), when temperature in the urea pump is higher than corresponding with it thawing and accomplishes preset temperature, the urea pump completion of thawing.
5. the controlling method that SCR system hypothermia as claimed in claim 4 thaws is characterized in that,
In the step 11), the Preset Time that thaws of the urea pump that prestores;
In the step 12); If temperature is higher than corresponding with it thawing when accomplishing preset temperature in the urea pump, record urea pump temperature is higher than corresponding with it thawing to be accomplished the endurance of preset temperature, judges whether this endurance surpasses the Preset Time that thaws of urea pump; If, the urea pump completion of thawing.
6. according to claim 1 or claim 2 the SCR system hypothermia controlling method of thawing is characterized in that,
Detected object in the step 11) comprises the urea pipe, when detecting urea pipe temperature, detects the ambient temperature of urea pipe;
In the step 12), after the urea pipe gets into thaw routine, calculate the urea pipe needed time that thaws, surpass when thawing urea pipe needed time, the completion of thawing of urea pipe when urea pipe Cumulative time of thawing based on the current environmental temperature that detects.
7. according to claim 1 or claim 2 the SCR system hypothermia controlling method of thawing is characterized in that,
In the step 11), preset temperature is accomplished in the heating that prestores corresponding with detected object;
In the step 13), if the temperature of detected object is higher than when preset temperature is accomplished in the heating of correspondence with it, then heating is accomplished.
8. the controlling method that SCR system hypothermia as claimed in claim 7 thaws is characterized in that,
In the step 11), the heating Preset Time that prestores corresponding with detected object;
In the step 13); When if the temperature of detected object is higher than corresponding with it heating completion preset temperature; Record detected object temperature is higher than the endurance that preset temperature is accomplished in corresponding with it heating; And judge whether this endurance be higher than with it corresponding heating Preset Time, if the detected object heating is accomplished.
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