CN105649735A - Online detecting method and device of SCR urea nozzle faults - Google Patents
Online detecting method and device of SCR urea nozzle faults Download PDFInfo
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- CN105649735A CN105649735A CN201510970009.XA CN201510970009A CN105649735A CN 105649735 A CN105649735 A CN 105649735A CN 201510970009 A CN201510970009 A CN 201510970009A CN 105649735 A CN105649735 A CN 105649735A
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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
Abstract
The invention provides an online detecting method of SCR urea nozzle faults. The method comprises the steps of: receiving a test triggering command of a diagnosis instrument by a driving computer ECU of a vehicle to be detected; obtaining a testing value of testing equipment according to the test triggering command, and judging if the testing value is in a preset range; if so, obtaining a upstream NOx measurement value of a SCR upstream NOx sensor in a first preset time period and a downstream NOx measurement value of a SCR downstream NOx sensor in the first preset time period; and obtaining a detection result of leakage of a urea nozzle according to the upstream NOx measurement value and the downstream NOx measurement value. The method obtains the detection result of leakage of the urea nozzle according to the upstream NOx measurement value of the upstream NOx sensor and the downstream NOx measurement value of the downstream NOx sensor, so that the leakage of the urea nozzle is judged online in real time, and the SCR reliability is improved. The invention further provides a detecting device.
Description
Technical field
The present invention relates to the urea nozzle failure on-line detecting method of a kind of SCR and device.
Background technology
SCR is finishing apparatus that Europe six route the is essential emission standard of heavy vehicle (Europe six be), for the Nox removed in diesel exhaust. With reference to Fig. 1, the physical construction of SCR is: comprise SCR case 1, an exhaust gases upstream pipe 2 and downstream flue gas pipe 3 it is separately installed with at the two ends of SCR case 1, exhaust gases upstream pipe 2 is provided with Upstream NOx sensor 5 and urea nozzle 4, urea nozzle 4 for spraying urea in waste pipe, being provided with downstream NOx sensor 6 on downstream flue gas pipe 3, Upstream NOx sensor 5, downstream NOx sensor 6 and urea nozzle 4 connect car running computer ECU (not shown) respectively. Ultimate principle sprays urea before SCR case 1, decomposes and produces NH3 and NOx generation redox reaction generation nitrogen and water. Urea nozzle sends pwm control signal by ECU and controls, frequency is 1HZ, can accurately control the injection of urea under normal circumstances, but owing to nozzle operation frequency is higher, and directly contact with high-temp waste gas, work under bad environment, in addition the individual difference of reliability, easily causes nozzle mechanical fault, and wherein in experiment, a kind of common mechanical fault is when not driving, urea nozzle has urea and flows out, namely urea nozzle is not controlled, not only causes the waste of urea, and very easily causes crystallization, reduce SCR conversion efficiency, endanger huge.
Easily there is mechanical fault in urea nozzle, in experiment, a kind of common fault is when not driving, and nozzle has urea and flows out, and not only causes urea waste but also very easily causes crystallization, endangers huge. The present invention proposes a kind of method that urea nozzle reveals fault of determining online, and convenient service station adopts diagnostic equipment to carry out the judgement of urea nozzle mechanical fault. It is an object of the invention to solve urea nozzle because of mechanical fault cause urea reveal crystallization problem.
Summary of the invention
The present invention provides urea nozzle failure on-line detecting method and the device of a kind of SCR, the detected result whether urea nozzle leak can be obtained by the upstream NOx observed value of Upstream NOx sensor and downstream NOx sensor and downstream NOx observed value, thus can real-time judge urea nozzle mechanical fault causes online leakage, thus effectively reduce the crystalline polamer revealed and cause.
First aspect, the present invention provides the urea nozzle failure on-line detecting method of a kind of SCR, comprising:
The car running computer ECU of vehicle to be measured receives the triggering test order of diagnostic equipment;
Trigger, according to described, the test value that test order obtains testing apparatus, and judge described test value whether in preset range;
If, then the upstream NOx observed value of the Upstream NOx sensor obtaining SCR in the first preset time period, and the downstream NOx observed value of the downstream NOx sensor of SCR in described first preset time period;
According to the detected result whether described upstream NOx observed value and downstream NOx observed value acquisition urea nozzle leak.
Preferably, according to the detected result whether described upstream NOx observed value and downstream NOx observed value acquisition urea nozzle leak, comprising:
Calculate the upstream NOx integrated value of described Upstream NOx sensor in described first preset time period according to described upstream NOx observed value, and calculate the downstream NOx integrated value of described downstream NOx sensor in described first preset time period according to described downstream NOx observed value;
Judge whether the difference that described upstream NOx integrated value subtracts downstream NOx integrated value is greater than a pre-set limit;
If being greater than, then output error mark.
Further, obtain the upstream NOx observed value of Upstream NOx sensor in the first preset time period of SCR, and before the downstream NOx observed value of the downstream NOx sensor of SCR in described first preset time period, described method also comprises:
Send to urea nozzle and close order;
Close after the 2nd preset time period in urea nozzle, the upstream NOx observed value of the Upstream NOx sensor obtaining SCR in the first preset time period, and the downstream NOx observed value of the downstream NOx sensor of SCR in described first preset time period.
Further, after obtaining, according to described upstream NOx observed value and downstream NOx observed value, the detected result whether described urea nozzle leaks, described method also comprises:
Described detected result is sent to described diagnostic equipment.
Preferably, described test value comprises: the absolute value of the undulating quantity of the flux values of waste gas, Upstream NOx sensor in temperature value, SCR before the running status value of described vehicle startup machine to be measured, the tachometer value of described vehicle startup machine to be measured, SCR, the undulating quantity of downstream NOx sensor, the historical measurements of Upstream NOx sensor and the deviation of the model calculation value preset, and the absolute value of the historical measurements of downstream NOx sensor and the deviation of the model calculation value preset.
Second aspect, the present invention also provides the urea nozzle On-line Fault Detection device of a kind of SCR, comprising:
Receiving unit, the car running computer ECU of vehicle to be measured receives the triggering test order of diagnostic equipment;
Judging unit, triggers, according to described, the test value that test order obtains testing apparatus, and judges described test value whether in preset range;
Observed value acquiring unit, if, then the upstream NOx observed value of the Upstream NOx sensor obtaining SCR in the first preset time period, and the downstream NOx observed value of the downstream NOx sensor of SCR in described first preset time period;
Detected result acquiring unit, obtains, according to described upstream NOx observed value and downstream NOx observed value, the detected result whether described urea nozzle leak.
Preferably, detected result acquiring unit, comprising:
Computation subunit, calculate the upstream NOx integrated value of described Upstream NOx sensor in described first preset time period according to described upstream NOx observed value, and calculate the downstream NOx integrated value of described downstream NOx sensor in described first preset time period according to described downstream NOx observed value;
Judgment sub-unit, judges whether the difference that described upstream NOx integrated value subtracts downstream NOx integrated value is greater than a pre-set limit;
Error identification exports subelement, if being greater than, then and output error mark.
Preferably, described device also comprises:
Before closedown command sending unit, the upstream NOx observed value of the Upstream NOx sensor of acquisition SCR in the first preset time period, and the downstream NOx sensor of the SCR downstream NOx observed value in described first preset time period, send to urea nozzle and close order;
Wait unit, close after the 2nd preset time period in urea nozzle, the upstream NOx observed value of the Upstream NOx sensor obtaining SCR in the first preset time period, and the downstream NOx observed value of the downstream NOx sensor of SCR in described first preset time period.
Preferably, described device also comprises:
Detected result sends unit, after obtaining, according to described upstream NOx observed value and downstream NOx observed value, the detected result whether described urea nozzle leaks, described detected result is sent to described diagnostic equipment.
Preferably, the absolute value of the undulating quantity of the flux values of waste gas, Upstream NOx sensor in temperature value, SCR before the running status value of described vehicle startup machine to be measured, the tachometer value of described vehicle startup machine to be measured, SCR, the undulating quantity of downstream NOx sensor, the historical measurements of Upstream NOx sensor and the deviation of the model calculation value preset, and the absolute value of the historical measurements of downstream NOx sensor and the deviation of the model calculation value preset.
As shown from the above technical solution, the present invention obtains upstream NOx observed value and downstream NOx observed value by Upstream NOx sensor and downstream NOx sensor, and obtain, by upstream NOx observed value and downstream NOx observed value, the detected result whether urea nozzle leak, thus can real-time judge urea nozzle mechanical fault causes online leakage, thus effectively reduce the crystalline polamer revealed and cause, it is to increase the reliability of SCR.
Accompanying drawing explanation
Fig. 1 is the part-structure schematic diagram of existing SCR;
The schema of the urea nozzle failure on-line detecting method of a kind of SCR that Fig. 2 provides for one embodiment of the invention;
The functional block diagram of the urea nozzle On-line Fault Detection device of a kind of SCR that Fig. 3 provides for one embodiment of the invention.
Description of reference numerals
SCR case 1 exhaust gases upstream pipe 2 downstream flue gas pipe 3 urea nozzle 4 Upstream NOx sensor 5 downstream NOx sensor 6
Receive unit 401 judging unit 402 observed value acquiring unit 403 detected result acquiring unit 404.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail. Following examples are for illustration of the present invention, but are not used for limiting the scope of the invention.
The explanation of nouns related in the present invention:
NOx: oxynitrides, mainly comprises nitrogen protoxide NO and nitrogen peroxide NO2.
SCR: selective catalytic reduction system operating, utilizes urea decomposition to produce ammonia, and under catalyst action, ammonia and NOx carry out reacting thus reduce NOx emission.
Store the region of some variable in EEPROM:ECU for lower electricity, the variable being stored in this region powers on and can read the value of last stored.
NH3: ammonia, the input of SCR system is used for reducing NOx, and poisonous, Abgasgesetz strictly controls.
NOx sensor: a kind of sensor that can test real-time NOx concentration.
NO: nitrogen protoxide, one of main noxious emission of diesel engine.
NO2: nitrogen peroxide, one of main noxious emission of diesel engine.
Fig. 2 shows the schema of the urea nozzle failure on-line detecting method of a kind of SCR that one embodiment of the invention provides.
As shown in Figure 2, the urea nozzle failure on-line detecting method of a kind of SCR of the present embodiment, comprising:
The car running computer ECU of S201, vehicle to be measured receives the triggering test order of diagnostic equipment; It should be noted that, ECU itself cannot start the test of the present invention herein, can only be that ECU sends triggering test order by the diagnostic equipment in service station.
S202, trigger, according to described, the test value that test order obtains testing apparatus, and judge described test value whether in preset range; If then performing step S203, otherwise, perform step S204;
If S203, then the upstream NOx observed value of the Upstream NOx sensor obtaining SCR in the first preset time period, and the downstream NOx sensor of the SCR downstream NOx observed value in described first preset time period;
S204, continue to perform step S202 judges described test value whether step in preset range;
S205, the detected result whether leaked according to described upstream NOx observed value and downstream NOx observed value acquisition urea nozzle.
It is understandable that, the present invention first started heavy goods vehicles before Upstream NOx sensor and downstream NOx sensor work, logical waste gas in SCR case, meeting certain condition, in such as SCR, the temperature of waste gas reaches preset value (having temperature sensor in SCR), SCR is when reaching default thawed state etc., SCR starts working, and Upstream NOx sensor, downstream NOx sensor start real-time measurement.
Therefore, the present invention obtains upstream NOx observed value and downstream NOx observed value by Upstream NOx sensor and downstream NOx sensor, and obtain, by upstream NOx observed value and downstream NOx observed value, the detected result whether urea nozzle leak, thus can real-time judge urea nozzle mechanical fault causes online leakage, thus effectively reduce the crystalline polamer revealed and cause, it is to increase the reliability of SCR.
Preferably, described step S205, comprising:
S301, calculate the upstream NOx integrated value of described Upstream NOx sensor in described first preset time period according to described upstream NOx observed value, and calculate the downstream NOx integrated value of described downstream NOx sensor in described first preset time period according to described downstream NOx observed value;
Whether S302, the difference judging described upstream NOx integrated value and subtracting downstream NOx integrated value are greater than a pre-set limit; If being greater than, then perform step S303, otherwise, perform step S304;
If S303 is greater than, then output error mark; Now show that urea nozzle is leaked. Now upstream NOx observed value and downstream NOx observed value should be basically identical in theory, if urea nozzle exists mechanical fault, then downstream NOx observed value can lower than upstream NOx observed value.
If S304 is less than or equal to, then export correct mark. Now show that urea nozzle is not leaked, wait the triggering test order of diagnostic equipment.
Herein according to the NOx observed value in the time period as judging the foundation whether urea nozzle leaks, it is convenient to obtain accurate detected result.
Further, before described step S203, described method also comprises:
S206, to urea nozzle send close order;
After S207, urea nozzle close the 2nd preset time period, perform step S203, obtain the upstream NOx observed value of Upstream NOx sensor in the first preset time period of SCR, and the downstream NOx observed value of the downstream NOx sensor of SCR in described first preset time period.
What deserves to be explained is, this step carries out after the test value of described testing apparatus is in preset range.
First close urea nozzle, and to wait for a period of time be the level that can ignore storage ammonia in order to allow storage ammonia (ammonia of the storage) level in SCR drop to, to reduce storage ammonia to the impact (owing to the present invention is exactly as reactant with the ammonia of urea decomposition) of detected result.
After described step S205, described method also comprises:
S208, described detected result is sent to described diagnostic equipment. Detected result is shown by diagnostic equipment, is convenient to viewing.
Described test value comprises: the absolute value of the undulating quantity of the flux values of waste gas, Upstream NOx sensor in temperature value, SCR before the running status value of described vehicle startup machine to be measured, the tachometer value of described vehicle startup machine to be measured, SCR, the undulating quantity of downstream NOx sensor, the historical measurements of Upstream NOx sensor and the deviation of the model calculation value preset, and the absolute value of the historical measurements of downstream NOx sensor and the deviation of the model calculation value preset. Before SCR, temperature value is the temperature in the exhaust gases upstream pipe of SCR.
The present invention ensure above-mentioned parts all normal operation time just start to measure, get rid of the impact that sensor measured deviation etc. causes, guarantee test result is accurate.
The functional block diagram of the urea nozzle On-line Fault Detection device of a kind of SCR that Fig. 3 provides for one embodiment of the invention.
As shown in Figure 3, the urea nozzle On-line Fault Detection device of a kind of SCR, comprising:
Receiving unit 401, the car running computer ECU of vehicle to be measured receives the triggering test order of diagnostic equipment;
Judging unit 402, triggers, according to described, the test value that test order obtains testing apparatus, and judges described test value whether in preset range;
Observed value acquiring unit 403, if, then the upstream NOx observed value of the Upstream NOx sensor obtaining SCR in the first preset time period, and the downstream NOx observed value of the downstream NOx sensor of SCR in described first preset time period;
Detected result acquiring unit 404, obtains, according to described upstream NOx observed value and downstream NOx observed value, the detected result whether described urea nozzle leak.
Preferably, detected result acquiring unit 404, comprising:
Computation subunit, calculate the upstream NOx integrated value of described Upstream NOx sensor in described first preset time period according to described upstream NOx observed value, and calculate the downstream NOx integrated value of described downstream NOx sensor in described first preset time period according to described downstream NOx observed value;
Judgment sub-unit, judges whether the difference that described upstream NOx integrated value subtracts downstream NOx integrated value is greater than a pre-set limit;
Error identification exports subelement, if being greater than, then and output error mark.
Further, described device also comprises:
Before closedown command sending unit, the upstream NOx observed value of the Upstream NOx sensor of acquisition SCR in the first preset time period, and the downstream NOx sensor of the SCR downstream NOx observed value in described first preset time period, send to urea nozzle and close order;
Wait unit, close after the 2nd preset time period in urea nozzle, the upstream NOx observed value of the Upstream NOx sensor obtaining SCR in the first preset time period, and the downstream NOx observed value of the downstream NOx sensor of SCR in described first preset time period.
Further, described device also comprises:
Detected result sends unit, after obtaining, according to described upstream NOx observed value and downstream NOx observed value, the detected result whether described urea nozzle leaks, described detected result is sent to described diagnostic equipment.
Described test value can comprise: the absolute value of the undulating quantity of the flux values of waste gas, Upstream NOx sensor in temperature value, SCR before the running status value of described vehicle startup machine to be measured, the tachometer value of described vehicle startup machine to be measured, SCR, the undulating quantity of downstream NOx sensor, the historical measurements of Upstream NOx sensor and the deviation of the model calculation value preset, and the absolute value of the historical measurements of downstream NOx sensor and the deviation of the model calculation value preset.
Owing to the urea nozzle On-line Fault Detection device of a kind of SCR in the present invention and the urea nozzle failure on-line detecting method of a kind of SCR are one to one, therefore it is not described in detail in this this device.
One of ordinary skill in the art will appreciate that: above each embodiment, only in order to the technical scheme of the present invention to be described, is not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technology feature is carried out equivalent replacement; And these amendments or replacement, do not make the essence disengaging the scope of the claims in the present invention of appropriate technical solution.
Claims (10)
1. the urea nozzle failure on-line detecting method of a SCR, it is characterised in that, comprising:
The car running computer ECU of vehicle to be measured receives the triggering test order of diagnostic equipment;
Trigger, according to described, the test value that test order obtains testing apparatus, and judge described test value whether in preset range;
If, then the upstream NOx observed value of the Upstream NOx sensor obtaining SCR in the first preset time period, and the downstream NOx observed value of the downstream NOx sensor of SCR in described first preset time period;
According to the detected result whether described upstream NOx observed value and downstream NOx observed value acquisition urea nozzle leak.
2. method according to claim 1, it is characterised in that, according to the detected result whether described upstream NOx observed value and downstream NOx observed value acquisition urea nozzle leak, comprising:
Calculate the upstream NOx integrated value of described Upstream NOx sensor in described first preset time period according to described upstream NOx observed value, and calculate the downstream NOx integrated value of described downstream NOx sensor in described first preset time period according to described downstream NOx observed value;
Judge whether the difference that described upstream NOx integrated value subtracts downstream NOx integrated value is greater than a pre-set limit;
If being greater than, then output error mark.
3. method according to claim 1, it is characterized in that, obtain the upstream NOx observed value of Upstream NOx sensor in the first preset time period of SCR, and before the downstream NOx observed value of the downstream NOx sensor of SCR in described first preset time period, described method also comprises:
Send to urea nozzle and close order;
Close after the 2nd preset time period in urea nozzle, the upstream NOx observed value of the Upstream NOx sensor obtaining SCR in the first preset time period, and the downstream NOx observed value of the downstream NOx sensor of SCR in described first preset time period.
4. method according to claim 1, it is characterised in that, after obtaining, according to described upstream NOx observed value and downstream NOx observed value, the detected result whether described urea nozzle leaks, described method also comprises:
Described detected result is sent to described diagnostic equipment.
5. method according to claim 1, it is characterized in that, described test value comprises: the absolute value of the undulating quantity of the flux values of waste gas, Upstream NOx sensor in temperature value, SCR before the running status value of described vehicle startup machine to be measured, the tachometer value of described vehicle startup machine to be measured, SCR, the undulating quantity of downstream NOx sensor, the historical measurements of Upstream NOx sensor and the deviation of the model calculation value preset, and the absolute value of the historical measurements of downstream NOx sensor and the deviation of the model calculation value preset.
6. the urea nozzle On-line Fault Detection device of a SCR, it is characterised in that, comprising:
Receiving unit, the car running computer ECU of vehicle to be measured receives the triggering test order of diagnostic equipment;
Judging unit, triggers, according to described, the test value that test order obtains testing apparatus, and judges described test value whether in preset range;
Observed value acquiring unit, if, then the upstream NOx observed value of the Upstream NOx sensor obtaining SCR in the first preset time period, and the downstream NOx observed value of the downstream NOx sensor of SCR in described first preset time period;
Detected result acquiring unit, obtains, according to described upstream NOx observed value and downstream NOx observed value, the detected result whether described urea nozzle leak.
7. device according to claim 6, it is characterised in that, detected result acquiring unit, comprising:
Computation subunit, calculate the upstream NOx integrated value of described Upstream NOx sensor in described first preset time period according to described upstream NOx observed value, and calculate the downstream NOx integrated value of described downstream NOx sensor in described first preset time period according to described downstream NOx observed value;
Judgment sub-unit, judges whether the difference that described upstream NOx integrated value subtracts downstream NOx integrated value is greater than a pre-set limit;
Error identification exports subelement, if being greater than, then and output error mark.
8. device according to claim 6, it is characterised in that, described device also comprises:
Before closedown command sending unit, the upstream NOx observed value of the Upstream NOx sensor of acquisition SCR in the first preset time period, and the downstream NOx sensor of the SCR downstream NOx observed value in described first preset time period, send to urea nozzle and close order;
Wait unit, close after the 2nd preset time period in urea nozzle, the upstream NOx observed value of the Upstream NOx sensor obtaining SCR in the first preset time period, and the downstream NOx observed value of the downstream NOx sensor of SCR in described first preset time period.
9. device according to claim 6, it is characterised in that, described device also comprises:
Detected result sends unit, after obtaining, according to described upstream NOx observed value and downstream NOx observed value, the detected result whether described urea nozzle leaks, described detected result is sent to described diagnostic equipment.
10. method according to claim 6, it is characterized in that, described test value comprises: the absolute value of the undulating quantity of the flux values of waste gas, Upstream NOx sensor in temperature value, SCR before the running status value of described vehicle startup machine to be measured, the tachometer value of described vehicle startup machine to be measured, SCR, the undulating quantity of downstream NOx sensor, the historical measurements of Upstream NOx sensor and the deviation of the model calculation value preset, and the absolute value of the historical measurements of downstream NOx sensor and the deviation of the model calculation value preset.
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| CN109141560A (en) * | 2018-06-27 | 2019-01-04 | 潍柴动力股份有限公司 | Prevent the detection method and detection device of nitrogen oxide sensor misloading |
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