CN113648831B - NSC denitrification method and device - Google Patents
NSC denitrification method and device Download PDFInfo
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- CN113648831B CN113648831B CN202111044346.8A CN202111044346A CN113648831B CN 113648831 B CN113648831 B CN 113648831B CN 202111044346 A CN202111044346 A CN 202111044346A CN 113648831 B CN113648831 B CN 113648831B
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- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
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Abstract
The application discloses a nitrogen removal method and a nitrogen removal device for NSC, wherein the nitrogen removal method for NSC comprises the following steps: detecting a first temperature of a current NSC and a first accumulated nitrogen amount of the NSC; judging whether the first nitrogen accumulation amount is larger than a denitrification threshold value of a first temperature; if yes, judging whether the current condition of the engine meets the denitrification condition; if yes, starting denitrification operation; wherein the denitrification condition comprises that the temperature of cooling water in the engine is greater than a first temperature threshold value; the carrier temperature of the NSC is greater than a second temperature threshold; and the rotating speed and the torque of the engine are in a preset interval. The method and the device start the denitrification operation under the appropriate environmental condition, ensure the effectiveness of the denitrification operation and are beneficial to controlling the oil consumption and the temperature of the post-treatment.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to a nitrogen removal method and a nitrogen removal device for NSC.
Background
At present, a light-duty diesel vehicle usually adopts an NSC + DPF + SCR post-treatment route so as to meet the national light-duty vehicle national Liu B regulatory emission requirements. The NSC is named as NOx Storage Catalyst, is a nitrogen oxide Storage reduction technology, and barium carbonate in a Catalyst is used for adsorbing NOx emission at low temperature and plays a role in reducing the emission.
The adsorbed NOx reacts with the catalyst to generate barium nitrate, the barium nitrate occupies an adsorption space, and in order to ensure the continuous and effective adsorption of NSC, the generated barium nitrate needs to be regenerated and reduced into barium carbonate in time, N2 is generated, and the space of the catalyst is released. The denitrification operation needs to utilize a large amount of post-injection oil to form a lean burn condition, CO is generated to carry out reduction reaction, the increase of oil consumption and the rise of post-treatment temperature are easily caused, and the phenomena of oil consumption increase and over-temperature of a post-treatment system are caused by long-time denitrification.
Disclosure of Invention
The application provides a nitrogen removal method and a nitrogen removal device of NSC, which start the nitrogen removal operation under a proper environmental condition, ensure the effectiveness of the nitrogen removal operation and are beneficial to controlling the oil consumption and the temperature of post-treatment.
The application provides a method for denitrifying NSC, which comprises the following steps:
detecting a first temperature of a current NSC and a first accumulated nitrogen amount of the NSC;
judging whether the first nitrogen accumulation amount is larger than a denitrification threshold value of a first temperature;
if yes, judging whether the current condition of the engine meets the denitrification condition;
if yes, starting denitrification operation;
wherein the denitrification condition comprises that the temperature of cooling water in the engine is greater than a first temperature threshold value; the carrier temperature of the NSC is greater than a second temperature threshold; and the rotating speed and the torque of the engine are in a preset interval.
Preferably, the method further comprises the following steps:
and in the denitrification state, if the current condition of the engine does not meet the denitrification condition, forcibly exiting the denitrification operation.
Preferably, in the denitrification state, if the current condition of the engine meets the denitrification condition, judging whether the denitrification accumulated time is less than a first time threshold value;
if yes, calculating a second nitrogen accumulation amount in real time according to the denitrification rate;
if the second accumulated nitrogen amount is 0, the denitrification operation is completed.
Preferably, the method further comprises the steps of calculating a second accumulated nitrogen amount and simultaneously acquiring signals of the front oxygen sensor and the rear oxygen sensor;
if the second accumulated nitrogen amount is 0 or the signal of the front oxygen sensor is equal to the signal of the rear oxygen sensor, the denitrification operation is completed.
Preferably, if the denitrification accumulated time is greater than the first time threshold, the denitrification operation is forcibly exited;
and is
And if the accumulated time after the forced exiting of the denitrification operation is greater than the second time threshold and the current third accumulated nitrogen amount is greater than half of the denitrification threshold of the current second temperature of the NSC, restarting the denitrification operation.
The application provides a NSC denitrification device, which comprises a detection module, a judgment module and a denitrification module;
the detection module is used for detecting a first temperature of the current NSC and a first accumulated nitrogen amount of the NSC;
the judging module is used for judging whether the first accumulated nitrogen amount is larger than a denitrification threshold of a first temperature or not and whether the current condition of the engine meets the denitrification condition or not, wherein the denitrification condition comprises that the temperature of cooling water in the engine is larger than the first temperature threshold; the carrier temperature of the NSC is greater than a second temperature threshold; the rotating speed and the torque of the engine are in a preset interval;
the denitrification module is used for starting denitrification operation.
Preferably, the device further comprises an exit module for forcibly exiting the denitrification operation if the current condition of the engine does not meet the denitrification condition in the denitrification state.
Preferably, the system further comprises a timer and a calculation module;
the timer is used for collecting denitrification accumulated time;
the calculation module is used for calculating a second nitrogen accumulation amount in real time according to the denitrification rate;
the judging module is also used for judging whether the denitrification accumulated time is less than a first time threshold value and judging whether the second nitrogen accumulated amount is 0.
Preferably, the detection module is further used for acquiring signals of the front oxygen sensor and the rear oxygen sensor;
the judging module is also used for judging that the signal of the front oxygen sensor is equal to the signal of the rear oxygen sensor.
Preferably, the timer is further configured to collect accumulated time after the forced exiting of the denitrification operation;
the judging module is further used for judging whether the accumulated time after the forced denitrification operation is exited is greater than a second time threshold and whether the current third accumulated nitrogen amount is greater than half of the denitrification threshold of the current NSC at the second temperature;
and the denitrification device also comprises a restarting module used for restarting denitrification operation.
Further features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
FIG. 1 is a flow diagram of a method for denitrogenation of NSCs provided herein;
fig. 2 is a structural diagram of a denitrification apparatus for NSCs provided by the present application.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
The application provides a nitrogen removal method and a nitrogen removal device of NSC, which start the nitrogen removal operation under a proper environmental condition, ensure the effectiveness of the nitrogen removal operation and are beneficial to controlling the oil consumption and the temperature of post-treatment; and the time for denitrification is controlled, so that the increase of oil consumption and the over-temperature risk caused by long-time denitrification are avoided, and the safety and the accuracy of denitrification operation are ensured.
Example one
As shown in fig. 1, the NSC denitrification method provided by the present application includes the following steps:
s1010: a first temperature of the current NSC and a first nitrogen accumulation amount NSC1_ mNOx of the NSC are detected.
The ECU records the first temperature of the current NSC and the amount of nitrogen oxides NOx currently adsorbed by the NSC in real time, namely the first accumulated nitrogen amount.
S1020: and judging whether the first nitrogen accumulation amount is larger than the nitrogen removal threshold NSC1_ mNOxMin of the first temperature. If yes, NSC1_ mNOx > NSC1_ mNOxMin, then S1030 is executed; otherwise, return to S1010.
The denitrification threshold for the first temperature is the minimum amount of nitrogen accumulated for which the NSC corresponding to the first temperature allows denitrification. As an example, the denitrification threshold for each temperature is shown in table 1.
TABLE 1
If the first accumulated nitrogen amount is larger than the denitrification threshold value of the first temperature, denitrification operation is required.
S1030: judging whether the current condition of the engine meets a denitrification condition or not, wherein the denitrification condition comprises that the temperature of cooling water in the engine is greater than a first temperature threshold value; the carrier temperature of the NSC is greater than a second temperature threshold; and the rotating speed and the torque of the engine are in a preset interval. If yes, go to S1040; otherwise, return to S1010.
If the temperature of the cooling water in the engine is greater than the first temperature threshold Twater, the temperature of the carrier of the NSC is greater than the second temperature threshold Tnsc, and the engine is operated within the set speed and torque interval (for example, the maximum and minimum limits of the speed and torque are shown in tables 2 and 3), the current conditions of the engine are satisfactory, and the denitrification operation can be started.
TABLE 2
TABLE 3
S1040: and starting denitrification operation.
In the denitrification state, the ECU records the cooling water temperature in the engine, the carrier temperature of NSC and the rotating speed and torque of the engine in real time, executes step S1050 in real time, judges whether the current condition of the engine meets the denitrification condition, and executes step S1070 if any one of the three parameters does not meet the requirement; otherwise, step S1060 is executed.
S1060: and judging whether the denitrification accumulated time T1 is smaller than a first time threshold Ta. If yes, i.e., T1 < Ta, S1090 is executed, otherwise, S1070 is executed.
The first time threshold is the longest denitrification time corresponding to the current NSC internal temperature.
For example, the correspondence between the NSC internal temperature and the maximum denitrification time is shown in table 4.
TABLE 4
S1090: and calculating a second nitrogen accumulation amount NSC2_ mNOx in real time according to the denitrification rate.
Specifically, as one embodiment, the ECU detects the rotation speed of the engine and the amount of oil (i.e., the amount of injected oil) of the engine in real time, obtains the denitrification rate NSC _ dmNoxUnld from the rotation speed and the amount of injected oil, and calculates the second accumulated nitrogen amount from the denitrification rate:
NSC2_mNOx＝NSC1_mNOx+NSC_dmNoxUnld*T1
wherein the denitrification rate NSC _ dmNoxUnld is negative.
As an example, the engine speed, oil mass, and denitrification rate of NSC are shown in Table 5.
TABLE 5
Preferably, the second accumulated nitrogen amount is calculated while detecting detection signals of a pre-oxygen sensor of the NSC and a post-oxygen sensor of the NSC.
The NSC can generate oxygen in the denitrification process, the oxygen content value of the rear oxygen sensor is higher than that of the front oxygen sensor in the initial stage, the oxygen content value of the rear oxygen sensor is gradually reduced until the signal of the rear oxygen sensor is reduced to be equal to that of the front oxygen sensor to form crossing, and the completion of denitrification is represented.
S1100: and judging whether the second accumulated nitrogen amount is 0 or not, or whether the signal of the front oxygen sensor is equal to the signal of the rear oxygen sensor or not. If any of the two conditions is satisfied, go to step S1110; otherwise, continuing the denitrification operation.
S1110: and (4) finishing the denitrification operation, and normally exiting the denitrification operation.
S1070, forcibly quitting the denitrification operation.
The denitrification operation is forcibly quitted under the condition that the denitrification condition is not met or the denitrification accumulated time is greater than the first time threshold, so that the denitrification efficiency is improved, and the conditions of increased oil consumption and too high aftertreatment temperature caused by long-time denitrification are avoided.
Preferably, in the case of forcibly exiting the denitrification operation, after waiting for a period of time to lower the internal temperature of the NSC, the denitrification operation is restarted according to the corresponding conditions.
In view of the above, preferably, the method for denitrifying NSC further comprises the steps of:
s1080: it is determined whether the accumulated time T2 after the forcible exit of the denitrification operation is greater than the second time threshold Tb and whether the current third accumulated nitrogen amount NSC3_ mNOx detected by the ECU is greater than half of the denitrification threshold NSC2_ mNOxMin for the second temperature of the current NSC (i.e., NSC3_ mNOx > 1/2NSC1_ mNOxMin). If the above two conditions are satisfied (i.e. T2 > Tb and NSC3_ mNOx > 1/2NSC1_ mNOxMin), returning to step S1040, and restarting the denitrification operation; otherwise, return to S1010.
Example two
The application also provides a NSC denitrification device corresponding to the NSC denitrification method. As shown in fig. 2, the apparatus for denitrification of NSC includes a detection module 210, a determination module 220, and a denitrification module 230.
The detection module 210 is configured to detect a first temperature of a current NSC and a first accumulated nitrogen amount of the NSC.
The judging module 220 is configured to judge whether the first accumulated nitrogen amount is greater than a denitrification threshold of a first temperature, and whether a current condition of the engine meets a denitrification condition, where the denitrification condition includes that a cooling water temperature in the engine is greater than the first temperature threshold; the carrier temperature of the NSC is greater than a second temperature threshold; and the rotating speed and the torque of the engine are in a preset interval.
The denitrification module 230 is used to initiate denitrification operations.
Preferably, the denitrification facility for NSCs further includes an exit module 240 for forcing exit of denitrification operation if the current conditions of the engine do not meet denitrification conditions in the denitrification state.
Preferably, the denitrification facility for NSC further comprises a timer 250 and a calculation module 260. The timer 250 is used for collecting the denitrification accumulated time. The calculating module 260 is configured to calculate the second accumulated nitrogen amount in real time according to the denitrification rate. In the preferred embodiment, the determining module 220 is further configured to determine whether the denitrification accumulated time is less than a first time threshold, and determine whether the second accumulated nitrogen amount is 0.
Preferably, the detection module 210 is further configured to collect signals of the front oxygen sensor and the rear oxygen sensor. The determining module 220 is further configured to determine that the signal of the front oxygen sensor is equal to the signal of the rear oxygen sensor.
Preferably, the timer 250 is also used to collect the accumulated time after the forced exit of the denitrification operation. The determining module 220 is further configured to determine whether the accumulated time after the forced exiting of the denitrification operation is greater than the second time threshold and whether the current third accumulated nitrogen amount is greater than half of the denitrification threshold of the second temperature of the current NSC. In the preferred embodiment, the denitrification facility also includes a restart module 270 for restarting denitrification operations.
This application can make the engine carry out the denitrogenation operation at reasonable operating mode, ensures safe effective, and it is long when simultaneously through accurate control denitrogenation, reduces aftertreatment oxygen deficiency overtemperature risk, reduces the oil consumption.
Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.
Claims (6)
1. A method for denitrogenation of NSC, comprising:
detecting a first temperature of a current NSC and a first accumulated nitrogen amount of the NSC;
judging whether the first accumulated nitrogen amount is larger than a denitrification threshold value of the first temperature;
if yes, judging whether the current condition of the engine meets the denitrification condition;
if yes, starting denitrification operation;
wherein the denitrification condition comprises that the temperature of cooling water in the engine is greater than a first temperature threshold value; the carrier temperature of the NSC is greater than a second temperature threshold; the rotating speed and the torque of the engine are in a preset interval;
further comprising:
in the denitrification state, if the current condition of the engine does not meet the denitrification condition, the denitrification operation is forcibly quitted;
in the denitrification state, if the current condition of the engine meets the denitrification condition, judging whether the denitrification accumulated time is less than a first time threshold value;
if so, calculating a second accumulated nitrogen amount in real time according to the denitrification rate, and simultaneously acquiring signals of a front oxygen sensor and a rear oxygen sensor;
if the second accumulated nitrogen amount is 0 or the signal of the front oxygen sensor is equal to the signal of the rear oxygen sensor, the denitrification operation is finished; if the denitrification accumulated time is greater than a first time threshold, forcibly exiting the denitrification operation;
and is
And if the accumulated time after the forced exiting of the denitrification operation is greater than the second time threshold and the current third accumulated nitrogen amount is greater than half of the denitrification threshold of the current second temperature of the NSC, restarting the denitrification operation.
2. A denitrification facility for NSCs for performing the method of claim 1, comprising a detection module, a determination module, and a denitrification module;
the detection module is used for detecting a first temperature of the current NSC and a first accumulated nitrogen amount of the NSC;
the judging module is used for judging whether the first accumulated nitrogen amount is larger than a denitrification threshold of the first temperature or not and whether the current condition of the engine meets a denitrification condition or not, wherein the denitrification condition comprises that the temperature of cooling water in the engine is larger than the first temperature threshold; the carrier temperature of the NSC is greater than a second temperature threshold; the rotating speed and the torque of the engine are in a preset interval;
the denitrification module is used for starting denitrification operation.
3. The NSC denitrification apparatus according to claim 2, further comprising an exit module for forcing exit of denitrification operation if current engine conditions do not meet said denitrification conditions in a denitrification state.
4. The apparatus for denitrification of NSCs according to claim 3, further comprising a timer and a calculation module;
the timer is used for collecting denitrification accumulated time;
the calculation module is used for calculating a second nitrogen accumulation amount in real time according to the denitrification rate;
the judging module is further used for judging whether the denitrification accumulated time is smaller than a first time threshold value and judging whether the second nitrogen accumulation amount is 0.
5. The NSC denitrification device according to claim 4, wherein the detection module is further configured to collect signals from a pre-oxygen sensor and a post-oxygen sensor;
the judging module is also used for judging that the signal of the front oxygen sensor is equal to the signal of the rear oxygen sensor.
6. The NSC denitrification apparatus according to claim 4, wherein the timer is further configured to collect a cumulative time after the forced exit of the denitrification operation;
the judging module is further configured to judge whether the accumulated time after the forced exiting of the denitrification operation is greater than a second time threshold and whether a current third accumulated nitrogen amount is greater than half of a denitrification threshold of a second temperature of the current NSC;
and the denitrification device also comprises a restarting module used for restarting denitrification operation.
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