CN113958390B - Urea pump pressure building duty ratio self-learning method - Google Patents
Urea pump pressure building duty ratio self-learning method Download PDFInfo
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- CN113958390B CN113958390B CN202111202396.4A CN202111202396A CN113958390B CN 113958390 B CN113958390 B CN 113958390B CN 202111202396 A CN202111202396 A CN 202111202396A CN 113958390 B CN113958390 B CN 113958390B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
- F01N2610/144—Control thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0402—Methods of control or diagnosing using adaptive learning
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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 discloses a self-learning method of a urea pump pressure-building duty ratio, which comprises the steps of firstly, according to an external temperature T, adjusting a first pressure-building duty ratio N1, and according to the first pressure-building duty ratio N1, controlling the operation of a urea pump; judging whether the pressure building is successful or not, if not, calculating an updated duty ratio Nr1 to replace a first pressure building duty ratio N1 corresponding to the external temperature T, updating and simultaneously acquiring a first pressure building duty ratio N1 again until the pressure building success is according to the external temperature T, calling a working pressure building duty ratio N2, controlling the urea pump to operate, judging whether the pressure building is successful or not, if not, calculating an updated duty ratio Nr2, replacing a working pressure building duty ratio N2 corresponding to the external temperature T, acquiring a working pressure building duty ratio N2 again after updating, acquiring a working pressure building success again, acquiring a working pressure building duty ratio N2 again, and then carrying out the working pressure building. Therefore, the preset first pressure build-up duty ratio N1 and the preset working pressure build-up duty ratio N2 can be continuously updated, and the pressure build-up adaptability, the pressure reduction failure robustness, the pressure reduction stability and the durability of the urea pump are improved.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a self-learning method for a pressure build-up space ratio of a urea pump.
Background
According to the current control technology, the duty ratio fixed value of the urea pump is found out through modes such as product development and market experience accumulation, and the duty ratio fixed value of the whole engine life cycle is not changed any more. However, the failure rate of the pressure build failure of the urea pump is high, and problems such as poor adaptability to impurity accumulation, NTF (pressure build failure fault error report) and the like need to be solved urgently.
Disclosure of Invention
Aiming at the defects, the technical problems to be solved by the invention are as follows: according to the method, the first pressure building and working pressure building space ratio of the urea pump is recorded and updated along with the change of conditions such as external environment, part states and the like, and the market adaptability, the pressure reduction failure fault robustness, the pressure building stability and the durability of the urea pump of a urea pump pressure building system are improved.
In order to solve the technical problem, the technical scheme of the invention is as follows:
a urea pump pressure build space ratio self-learning method comprises the following steps:
s10, obtaining an external temperature T;
s20, according to the external temperature T, calling a first pressure-building space ratio N1;
s30, controlling the urea pump to operate according to the first pressure build space ratio N1;
s40, judging whether the pressure build-up of the urea pump is successful;
s50, if not, a corresponding correction coefficient k1 is adjusted, an updating duty ratio Nr1 is calculated by using a formula Nr 1-min (N1 x k 1%, Nmax), and the updating duty ratio Nr1 replaces a first pressure-build duty ratio N1 at the corresponding external temperature T, wherein Nmax is the maximum operating duty ratio of the urea pump; simultaneously executing S20;
s51, if yes, according to the external temperature T, the working pressure build-up duty ratio N2 is called;
s60, controlling the operation of the urea pump according to the working pressure-build space ratio N2;
s70, judging whether the pressure build-up of the urea pump is successful;
s80, if not, calling a corresponding correction coefficient k2, calculating an updated duty ratio Nr2 by using a formula Nr2 which is min (N2 x k 2%, Nmax), and replacing a working pressure-build space ratio N2 corresponding to the external temperature T by the updated duty ratio Nr2, wherein Nmax is the maximum operating duty ratio of the urea pump; then, in S51, according to the external temperature T, the working pressure-build space ratio N2 is called;
and S81, if yes, executing S51, and calling the working voltage-boosting space ratio N2 according to the external temperature T.
Preferably, the S30 is specifically:
controlling the urea pump to operate according to the first pressure build-up duty ratio N1, and starting the pressure build-up times A to count;
then, between the S30 and the S40, the following steps are further included:
s31, judging whether the pressure building times A are larger than the preset times A1;
s320, if yes, reporting a pressure build failure fault of the urea pump;
s321, if not, executing S40.
Preferably, the S30 further includes: starting to time the first voltage building time t 1;
the corresponding correction coefficient k1 is retrieved according to the first voltage buildup time t1 in S50.
Preferably, the S51 is specifically:
s510, if yes, judging whether the first pressure building time t1 is greater than the preset first pressure building time;
s5110, if the temperature is not higher than the preset temperature T, calling a working pressure build-up duty ratio N2 according to the external temperature T;
s5111, if so, executing S20; and meanwhile, a corresponding correction coefficient k1 is adjusted, an updated duty ratio Nr1 is calculated by using a formula Nr 1-min (N1 × k 1%, Nmax), and the updated duty ratio Nr1 is used for replacing a first pressure-build air-to-space ratio N1 at the corresponding external temperature T, wherein Nmax is the maximum operating duty ratio of the urea pump.
Preferably, the S60 specifically includes:
controlling the urea pump to operate according to the working pressure buildup duty ratio N2, firstly clearing the working pressure buildup time t2, and then starting the working pressure buildup time t2 for timing;
then, the S81 further includes the following steps:
s810, if so, judging whether the working pressure buildup time t2 is greater than the preset working pressure buildup time;
s8110, if the temperature is not greater than the preset temperature, executing S51, and calling a working pressure-build space ratio N2 according to the external temperature T;
s8111, if the correction coefficient is larger than the correction coefficient, a corresponding correction coefficient k2 is called, an updated duty ratio Nr2 is calculated by using a formula Nr 2-min (N2 x k 2%, Nmax), an operating pressure buildup duty ratio N2 corresponding to the external temperature T is replaced by the updated duty ratio Nr2, wherein Nmax is the maximum duty ratio of the urea pump, and then S51 is carried out to call the operating pressure buildup duty ratio N2 according to the external temperature T.
Preferably, the S8111 specifically includes:
if the pressure is not greater than the preset value, acquiring a pump pressure P of the urea pump, calling a corresponding correction coefficient k2 according to the pump pressure P, calling a corresponding correction coefficient k2, calculating an updated duty ratio Nr2 by using a formula Nr 2-min (N2 × k 2%, Nmax), replacing a working pressure-building duty ratio N2 under the corresponding external temperature T by using the updated duty ratio Nr2, wherein Nmax is the maximum operating duty ratio of the urea pump, and calling a working pressure-building duty ratio N2 according to the external temperature T in S51.
Preferably, the external temperature T includes an ambient temperature T1, a urea tank temperature T2, and a urea pump temperature T3.
Preferably, a MAP1 table of a urea pump first pressurization duty ratio N1 is preset according to an ambient temperature T1, a urea tank temperature T2 and a urea pump temperature T3, and then in S20, the urea pump first pressurization duty ratio N1 is retrieved from the MAP1 table;
and/or the presence of a gas in the atmosphere,
and presetting a MAP2 table of the urea pump working pressure-building duty ratio N2 according to the ambient temperature T1, the urea box temperature T2 and the urea pump temperature T3, and then, in S51, calling the working pressure-building duty ratio N2 from the MAP2 table.
After the technical scheme is adopted, the invention has the beneficial effects that:
according to the self-learning method of the urea pump pressure build-up duty ratio, the external temperature T is obtained firstly, the first pressure build-up duty ratio N1 is adjusted according to the external temperature T, and the operation of the urea pump is controlled according to the first pressure build-up duty ratio N1; judging whether the pressure build-up of the urea pump is successful or not, if the pressure build-up is unsuccessful, updating the first pressure build-up duty ratio N1, at the moment, firstly calling a corresponding correction coefficient k1, calculating an updated duty ratio Nr1 by using a formula Nr1 as min (N1 x k 1% and Nmax), then replacing the first pressure build-up duty ratio N1 at the corresponding external temperature T with the updated duty ratio Nr1, simultaneously calling the first pressure build-up duty ratio N1, and controlling the urea pump to operate according to the first pressure build-up duty ratio N1 until the pressure build-up is successful; then according to the external temperature T, a working pressure build-up duty ratio N2 is called, the operation of the urea pump is controlled, whether the pressure build-up of the urea pump is successful or not is judged, if the pressure build-up of the urea pump is unsuccessful, a corresponding correction coefficient k2 is called, an updated duty ratio Nr2 is calculated by using a formula Nr 2-min (N2 xk 2%, Nmax), the working pressure build-up duty ratio N2 corresponding to the external temperature T is replaced by the updated duty ratio Nr2, the working pressure build-up duty ratio N2 is obtained again after the updating, and the working pressure build-up is carried out; and if the pressure building is successful, acquiring the working pressure building space ratio N2 to build the working pressure. Therefore, the method can continuously update the preset first pressure build-up duty ratio N1 and the preset working pressure build-up duty ratio N2, and improves the pressure build-up adaptability of the urea pump, the robustness of the pressure reduction failure fault, the pressure reduction stability and the durability of the urea pump.
Drawings
FIG. 1 is a flow chart of a method of self-learning of the pressure build-up duty ratio of a urea pump according to the present invention;
fig. 2 is a flow chart of an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 and fig. 2, a method for self-learning of the pressure buildup duty ratio of a urea pump comprises the following steps:
s10, obtaining an external temperature T; wherein the external temperature T may include an ambient temperature T1, a urea tank temperature T2, and a urea pump temperature T3; a MAP1 table of the first pressurization duty ratio N1 of the urea pump is preset according to the ambient temperature T1, the temperature T2 of the urea tank and the temperature T3 of the urea pump, and/or a MAP2 table of the working pressurization duty ratio N2 of the urea pump is preset according to the ambient temperature T1, the temperature T2 of the urea tank and the temperature T3 of the urea pump, and the MAP1 table and the MAP2 table are calibrated according to actual conditions in the test stage.
S20, according to the external temperature T, calling a first pressure-building space ratio N1; the first-pressure-build space ratio N1 can be adjusted from a MAP1 table according to the ambient temperature T1, the urea tank temperature T2 and the urea pump temperature T3.
S30, controlling the urea pump to operate according to the first pressure-build space ratio N1; simultaneously starting the voltage building frequency A to count, and starting timing for the first voltage building time t 1;
s31, judging whether the pressure building times A are larger than the preset times A1;
s320, if the judgment result is yes (A > A1), indicating that the fault occurs, reporting a pressure build failure fault of the urea pump;
s321, if not (A is less than or equal to A1), executing S40.
S40, judging whether the pressure build-up of the urea pump is successful; whether the pressure build-up succeeds can be judged by detecting the pumping pressure of the urea pump.
S50, if not (pressure build-up is unsuccessful), calling a corresponding correction coefficient k1 according to the first pressure build-up time T1 without fault, calculating an updated duty ratio Nr1 by using a formula Nr1 which is min (N1 x k 1%, Nmax), and replacing the first pressure build-up duty ratio N1 corresponding to the external temperature T by the updated duty ratio Nr1, wherein Nmax is the maximum operating duty ratio of the urea pump; executing S20 at the same time (i.e., repeatedly executing S20 to S40);
s51, specifically, the method comprises the following steps:
s510, if yes (pressure build-up is successful), judging whether the first pressure build-up time t1 is greater than the preset first pressure build-up time;
s5110, if the voltage is not more than (T1 is not more than ts1), if no fault exists, the working voltage-build space ratio N2 is adjusted according to the external temperature T; the working pressure-build space ratio N2 can be adjusted from a MAP2 table according to the ambient temperature T1, the urea tank temperature T2 and the urea pump temperature T3.
S5111, if the voltage is larger than (t1> ts1), indicating that the normal voltage build-up time is exceeded, executing S20 (namely, repeatedly executing S20 to S40); simultaneously, a corresponding correction coefficient k1 is adjusted, a formula Nr1 is used for being min (N1 x k 1%, Nmax), an updated duty ratio Nr1 is calculated, the updated duty ratio Nr1 is used for replacing a first pressure-build air-to-space ratio N1 corresponding to the external temperature T, and Nmax is the maximum operating duty ratio of the urea pump;
s60, controlling the urea pump to operate according to the working pressure-build space ratio N2; clearing the working pressure buildup time t2, and starting the working pressure buildup time t2 for timing;
s70, judging whether the pressure build-up of the urea pump is successful;
s80, if not (pressure build-up is unsuccessful), a corresponding correction coefficient k2 can be adjusted according to the pump pressure P, then an updated duty ratio Nr2 is calculated by using a formula Nr2 which is min (N2 x k 2%, Nmax), and the updated duty ratio Nr2 replaces the working pressure build-up duty ratio N2 at the corresponding external temperature T, wherein Nmax is the maximum operating duty ratio of the urea pump; then, in S51, according to the external temperature T, the working pressure buildup duty ratio N2 is called (i.e. S51 to S70 are repeatedly executed);
s81, specifically comprising the following steps:
s810, if yes (pressure build-up is unsuccessful), judging whether the working pressure build-up time t2 is greater than the preset working pressure build-up time;
s8110, if the temperature is not more than (T2 is not more than ts2), the operation step S51 is carried out, and the working voltage-build space ratio N2 is called according to the external temperature T (namely, the steps S51 to S70 are repeatedly carried out);
s8111, if the pressure is larger than (T2> ts2), acquiring the pump pressure P of the urea pump without fault, adjusting a corresponding correction coefficient k2 according to the pump pressure P, adjusting a corresponding correction coefficient k2, calculating an updated duty ratio Nr2 by using a formula Nr2 which is min (N2 x k 2%, Nmax), replacing a working pressure-build space ratio N2 corresponding to the external temperature T by the updated duty ratio Nr2, wherein Nmax is the maximum operating duty ratio of the urea pump, and then executing S51 to adjust the working pressure-build space ratio N2 according to the external temperature T (namely repeatedly executing S51 to S70).
The urea pump pressure-building duty ratio is divided into a first pressure-building duty ratio N1 and a working pressure-building duty ratio N2, the main reason is that the first pressure-building duty ratio needs to extract urea from a urea tank to the urea pump, the working pressure-building duty ratio emphasizes urea circulation, and the required duty ratios are different due to different emphasis.
After the T15 is ignited and electrified, the ambient temperature T1, the urea box temperature T2 and the urea pump temperature T3 are obtained, then the corresponding first pressure build-up duty ratio N1 is called from MAP1 according to the ambient temperature T1, the urea box temperature T2 and the urea pump temperature T3, the urea pump operates to build pressure according to the first pressure build-up duty ratio N1, meanwhile, the first pressure build-up time T1 is started for timing and the pressure build-up times A are counted, when the first pressure build-up is unsuccessful and exceeds the preset times, the failure fault of the urea pump pressure build-up is reported, when the first pressure build-up is unsuccessful and does not exceed the preset times, the first pressure build-up can be carried out again, and the first pressure build-up duty ratio N1 corresponding to the external temperature T is updated.
According to the invention, the corresponding correction coefficient k1 is adjusted according to the first pressure building time T1, and the first pressure building duty ratio N1 is corrected in real time, so that the urea pump can adjust the proper duty ratio under the same external temperature T, and the success probability of pressure building is increased. In order to ensure that the updating does not have errors, Nmax is set as the maximum duty ratio of the operation of the urea pump, and the minimum value of Nmax and N1 xk 1% is selected during updating so as to prevent the updating errors from influencing the operation of the urea pump.
According to the invention, the first pressure building is unsuccessful, or the first pressure building time t1 is greater than the preset first pressure building time ts1, when no fault exists, the first pressure building duty ratio N1 is updated, and S20-S40 are repeatedly executed while updating.
The first pressure building is successful, the working pressure building stage is started, the corresponding working pressure building duty ratio N2 is called from MAP2 according to the ambient temperature T1, the temperature T2 of the urea box and the temperature T3 of the urea pump, the pressure building is successful, whether the working pressure building time T2 is greater than the preset working pressure building time ts2 is judged, if the working pressure building duty ratio N2 is called again according to the ambient temperature T, the urea pump operates according to the working pressure building duty ratio N2 to carry out the working pressure building; and if the working pressure is not greater than the preset pressure, updating the working pressure-building duty ratio N2, adjusting the working pressure-building duty ratio N2 after updating, and operating the urea pump according to the working pressure-building duty ratio N2 to build the working pressure. Namely, when the working pressure building is unsuccessful or the working pressure building time t2 is not more than the preset working pressure building time ts2 and no fault exists, the working pressure building duty ratio N2 is updated.
Therefore, according to the method for self-learning the pressure build-up duty ratio of the urea pump, the first pressure build-up duty ratio and the working pressure build-up duty ratio of the urea pump are recorded and updated along with the change of conditions such as the external environment, the state of parts and the like, and the market adaptability, the pressure reduction failure fault robustness, the pressure build-up stability and the durability of the urea pump of the pressure build-up system of the urea pump are improved.
The duty ratio is inquired through an MAP graph according to the environment temperature, the urea box temperature and the urea pump temperature, the pressure building failure occurs under the fault-free condition, the duty ratio of the urea pump is adjusted through the product characteristics and the change of the duty ratio coefficient of the market experience machine type, the first pressure building duty ratio coefficient is adjusted according to the pressure building time, and the working pressure building duty ratio coefficient is adjusted according to the pumping pressure of the current period.
In addition, the system can be applied to a urea pump pressure build-up duty ratio self-learning system, and comprises a main control unit, a preset unit and a storage unit, wherein the preset unit can input a MAP1 table, a MAP2 table, preset times A1 and preset first pressure build-up time into the main control unit, and the main control unit is stored in the storage unit; the ambient temperature T1, the urea tank temperature T2, and the urea pump temperature T3 are collected by temperature sensors.
The above-described preferred embodiments of the present invention are not intended to limit the present invention, and any modifications, equivalent to a urea pump pressure build-up ratio self-learning method, etc. within the spirit and principle of the present invention shall be included in the scope of the present invention.
Claims (6)
1. A urea pump pressure build space ratio self-learning method is characterized by comprising the following steps:
s10, obtaining an external temperature T;
s20, according to the external temperature T, calling a first pressure-building space ratio N1;
s30, controlling the urea pump to operate according to the first pressure build space ratio N1;
s40, judging whether the pressure build-up of the urea pump is successful;
s50, if not, calling a corresponding correction coefficient k1, calculating an updated duty ratio Nr1 by using a formula Nr1 which is min (N1 x k 1%, Nmax), and replacing a first pressure-build duty ratio N1 corresponding to the external temperature T by the updated duty ratio Nr1, wherein Nmax is the maximum operating duty ratio of the urea pump; simultaneously executing S20;
s51, if yes, according to the external temperature T, calling the working pressure build-up duty ratio N2;
s60, controlling the operation of the urea pump according to the working pressure-build space ratio N2;
s70, judging whether the pressure build-up of the urea pump is successful;
s80, if not, a corresponding correction coefficient k2 is called, then an updated duty ratio Nr2 is calculated by using a formula Nr 2-min (N2 x k 2%, Nmax), and the updated duty ratio Nr2 replaces the working pressure-build duty ratio N2 at the corresponding external temperature T, wherein Nmax is the maximum operating duty ratio of the urea pump; then, in S51, according to the external temperature T, the working pressure build-up duty ratio N2 is called;
s81, if yes, the working voltage-build space ratio N2 is called again according to the external temperature T in S51;
the S30 specifically includes:
controlling the urea pump to operate according to the first pressure build-up duty ratio N1, and starting the pressure build-up times A to count;
then, between the S30 and the S40, the following steps are further included:
s31, judging whether the pressure buildup times A are larger than the preset times A1;
s320, if yes, reporting a pressure build failure fault of the urea pump;
s321, if not, executing S40;
the S30 further includes: starting to time the first voltage building time t 1;
the corresponding correction coefficient k1 is retrieved according to the first voltage buildup time t1 in S50.
2. The urea pump pressure buildup duty ratio self-learning method according to claim 1, wherein the step S51 is specifically as follows:
s510, if yes, judging whether the first pressure building time t1 is greater than the preset first pressure building time;
s5110, if the temperature is not higher than the preset temperature T, calling a working pressure build-up duty ratio N2 according to the external temperature T;
s5111, if so, executing S20; and meanwhile, a corresponding correction coefficient k1 is adjusted, an updated duty ratio Nr1 is calculated by using a formula Nr 1-min (N1 × k 1%, Nmax), and the updated duty ratio Nr1 is used for replacing a first pressure-build air-to-space ratio N1 at the corresponding external temperature T, wherein Nmax is the maximum operating duty ratio of the urea pump.
3. The method for self-learning of the pressure buildup duty ratio of the urea pump according to claim 1 or 2, wherein the step S60 specifically comprises the steps of:
controlling the operation of the urea pump according to the working pressure buildup duty ratio N2, firstly clearing the working pressure buildup time t2, and then starting the working pressure buildup time t2 for timing;
then, the S81 further includes the following steps:
s810, if so, judging whether the working pressure buildup time t2 is greater than the preset working pressure buildup time;
s8110, if the temperature is not larger than the preset temperature T, executing S51, and calling a working voltage-build space ratio N2 according to the external temperature T;
s8111, if the correction coefficient is larger than the correction coefficient, a corresponding correction coefficient k2 is called, an updated duty ratio Nr2 is calculated by using a formula Nr 2-min (N2 x k 2%, Nmax), an operating pressure buildup duty ratio N2 corresponding to the external temperature T is replaced by the updated duty ratio Nr2, wherein Nmax is the maximum duty ratio of the urea pump, and then S51 is carried out to call the operating pressure buildup duty ratio N2 according to the external temperature T.
4. The urea pump pressure buildup duty ratio self-learning method according to claim 3, wherein the S8111 specifically is:
if the difference is larger than the preset value, acquiring a pump pressure P of the urea pump, calling a corresponding correction coefficient k2 according to the pump pressure P, calling a corresponding correction coefficient k2, calculating an updated duty ratio Nr2 by using a formula Nr 2-min (N2 × k 2%, Nmax), replacing a working pressure-building duty ratio N2 under the corresponding external temperature T by using the updated duty ratio Nr2, wherein Nmax is the maximum operating duty ratio of the urea pump, and calling a working pressure-building duty ratio N2 according to the external temperature T in S51.
5. The urea pump pressure buildup duty cycle self-learning method of claim 3, wherein said external temperature T comprises ambient temperature T1, urea tank temperature T2 and urea pump temperature T3.
6. The self-learning method of the urea pump pressure-build space ratio according to claim 5, wherein a MAP1 table of a urea pump first pressure-build space ratio N1 is preset according to an ambient temperature T1, a urea tank temperature T2 and a urea pump temperature T3, and then the urea pump first pressure-build space ratio N1 is adjusted from a MAP1 table in S20;
and/or the presence of a gas in the gas,
and presetting a MAP2 table of the operating pressure buildup duty ratio N2 of the urea pump according to the ambient temperature T1, the urea box temperature T2 and the urea pump temperature T3, and then in S51, calling the operating pressure buildup duty ratio N2 from the MAP2 table.
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| CN202111202396.4A CN113958390B (en) | 2021-10-15 | 2021-10-15 | Urea pump pressure building duty ratio self-learning method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013080805A1 (en) * | 2011-11-30 | 2013-06-06 | アイシン精機株式会社 | Pump control unit |
| CN107255071A (en) * | 2017-08-09 | 2017-10-17 | 上海星融汽车科技有限公司 | It is pumped control method and its control system |
| CN108691623A (en) * | 2017-04-12 | 2018-10-23 | 天纳克（苏州）排放***有限公司 | The method for building pressure is segmented to exhaust gas aftertreatment system |
| CN110953055A (en) * | 2019-12-11 | 2020-04-03 | 潍柴动力股份有限公司 | Fault detection method and device for urea pump |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013080805A1 (en) * | 2011-11-30 | 2013-06-06 | アイシン精機株式会社 | Pump control unit |
| CN108691623A (en) * | 2017-04-12 | 2018-10-23 | 天纳克（苏州）排放***有限公司 | The method for building pressure is segmented to exhaust gas aftertreatment system |
| CN107255071A (en) * | 2017-08-09 | 2017-10-17 | 上海星融汽车科技有限公司 | It is pumped control method and its control system |
| CN110953055A (en) * | 2019-12-11 | 2020-04-03 | 潍柴动力股份有限公司 | Fault detection method and device for urea pump |
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