CN112523846B - Method for diagnosing urea consumption deviation based on rotating speed of pump motor - Google Patents
Method for diagnosing urea consumption deviation based on rotating speed of pump motor Download PDFInfo
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- CN112523846B CN112523846B CN202011166125.3A CN202011166125A CN112523846B CN 112523846 B CN112523846 B CN 112523846B CN 202011166125 A CN202011166125 A CN 202011166125A CN 112523846 B CN112523846 B CN 112523846B
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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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- 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]
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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
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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
- F01N2900/0418—Methods of control or diagnosing using integration or an accumulated value within an elapsed period
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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 discloses a method for diagnosing urea consumption deviation based on the rotating speed of a pump motor. The invention provides a method for diagnosing urea consumption deviation based on the rotating speed of a pump motor, wherein the urea consumption deviation is judged based on the rotating speed deviation of the urea pump motor, the urea consumption deviation is diagnosed by the difference between the theoretical motor rotating speed and the actual motor rotating speed of the urea pump, faults are sent to an ECU controller through messages, real-time diagnosis and monitoring are carried out, and the accuracy and the real-time performance of diagnosis results are ensured.
Description
Technical Field
The invention relates to the technical field of urea consumption deviation diagnosis, in particular to a method for diagnosing urea consumption deviation based on the rotating speed of a pump motor.
Background
In the prior art, the patent name "a method for diagnosing urea consumption deviation based on a urea level sensor", patent publication No. CN111075544A, the diagnostic logic of the method is: completing the power-on initialization of the engine management system; the urea solution and the pipeline are in an unfrozen state; the urea level sensor is normal; the urea liquid level value is in a certain range; the urea is in an injection state; the above conditions are simultaneously satisfied, and after a certain time delay confirmation processing, the diagnosis admission condition is satisfied, and after the condition is satisfied, data initialization operation is executed (the purpose is to clear the previously stored data and prepare for urea consumption diagnosis); a diagnostic duration counter counts; after the engine is powered off, the counter value is stored in an EEPROM (electrically erasable programmable read-only memory) of a data storage area of an engine management system, counting is carried out on the basis after the engine is powered on next time, time is set at intervals, integration is carried out on urea injection quantity set by a selective catalytic reduction System (SCR) to calculate theoretical urea consumption, actual urea consumption is calculated by combining a urea liquid level sensor, and finally, urea consumption deviation is judged by comparing the ratio of actual total urea consumption to theoretical consumption and a threshold value.
In the prior art, the following disadvantages exist:
1) the urea consumption is calculated based on the urea liquid level sensor signal, so that the urea consumption calculation deviation can be caused and misjudgment can be carried out when the urea liquid level sensor signal has poor precision or the signal jumps and is abnormal under special working conditions;
2) in the prior art, the steps of diagnosing the access conditions and calculating the logic are complicated, the difficulty of calibration is increased, more ECU resources are occupied, and the comprehensive development cost is increased;
3) in the prior art, the urea consumption deviation is diagnosed based on a urea liquid level sensor and a urea consumption calculation strategy in an ECU (electronic control unit), so that once a fault caused by misjudgment of overlarge/undersize urea consumption deviation occurs in the market, the after-sale problem is difficult to identify, and the responsibility is not clear;
4) in the prior art, the urea consumption deviation is a condition that urea is consumed by a liquid level signal of a urea liquid level sensor, so that the liquid level change is influenced when urea is filled midway, and the urea can not be diagnosed in real time by complicated judgment and calculation again, so that the urea consumption deviation has limitations.
Disclosure of Invention
In order to solve the problems, the invention provides a method for diagnosing urea consumption deviation based on the rotating speed of a pump motor, the urea consumption deviation is judged based on the rotating speed deviation of the urea pump motor, the urea consumption deviation is diagnosed according to the difference between the theoretical motor rotating speed and the actual motor rotating speed of the urea pump, faults are sent to an ECU controller through messages, real-time diagnosis and monitoring are carried out, and the accuracy and the real-time performance of diagnosis results are guaranteed.
The invention adopts the following technical scheme to realize the purpose:
a method for diagnosing urea consumption deviation based on pump motor rotating speed is applied to a urea pump module, the urea pump module comprises a urea pump device and an ECU controller, a motor rotating speed sensor is arranged in the urea pump device, the motor rotating speed sensor is electrically connected with the ECU controller after the urea pump device is monitored and diagnosed, and the urea pump device is also provided with a nozzle; the method comprises the following steps:
s1, controlling the nozzle to spray urea outwards by the urea pump device, monitoring the motor speed by the motor speed sensor, monitoring the deviation level of the actual injection quantity by the required injection quantity and the motor speed, and identifying the deviation of the actual urea injection quantity:
s2, judgment: when the urea injection demand is larger than or equal to a set value, the target injection quantity change rate is smaller than the set value, the urea pressure change amplitude is smaller than the set value, the urea injection quantity and the urea pump motor rotating speed are monitored, the difference between the theoretical motor rotating speed difference and the actual motor rotating speed difference is compared, if the difference between the theoretical motor rotating speed difference and the actual motor rotating speed difference is larger than the set value and continuously exceeds the set time, an error event that the actual injection quantity is small once is recorded, when the error event is accumulated and exceeds the set times, a urea consumption too low fault is reported, and fault information is sent to the ECU controller through a message 0x18F2D 43D;
when the urea injection demand is larger than or equal to a set value, the target injection quantity change rate is smaller than the set value, the urea pressure change amplitude is smaller than the set value, the urea injection quantity and the urea pump motor rotating speed are monitored, the difference between the theoretical motor rotating speed difference and the actual motor rotating speed difference is compared, if the difference between the theoretical motor rotating speed difference and the actual motor rotating speed difference is smaller than the set value and continuously exceeds the set time, an error event with larger actual injection quantity is recorded, when the error event is accumulated and exceeds the set times, a fault that the urea consumption is too high is reported, and fault information is sent to the ECU controller through a message 0x18F2D 43D;
the theoretical motor speed difference is the motor speed between the theoretical motor target speed and the zero injection amount, and the actual motor speed difference is the motor speed between the actual motor target speed and the zero injection amount.
Preferably, the motor speed sensor is electrically connected with the ECU controller through a CAN wire after being monitored and diagnosed inside the urea pump device.
Compared with the prior art, the invention has the following advantages:
1) the urea consumption deviation is judged based on the urea pump motor rotating speed deviation, the urea consumption deviation is diagnosed according to the difference between the theoretical motor rotating speed and the actual motor rotating speed of the urea pump, and the fault is sent to the ECU controller through a message, so that the deviation caused by the problem of a urea liquid level sensor can be effectively avoided;
2) the urea consumption deviation is judged based on the urea pump motor rotating speed deviation, the urea consumption deviation is diagnosed by the difference between the urea pump theoretical motor rotating speed and the actual motor rotating speed, and the fault is sent to the ECU controller through a message, so that a large amount of calculation logic of the ECU controller is saved, the calibration is simplified, the ECU controller resource is saved, and the comprehensive development cost is also reduced;
3) the urea consumption deviation is judged based on the urea pump motor rotating speed deviation, the urea consumption deviation is diagnosed through the difference between the urea pump theoretical motor rotating speed and the actual motor rotating speed, faults are sent to the ECU controller through messages, the ECU controller only receives the results fed back by the pump to display the faults, after-sale responsibilities can be accurately identified, and contradictions are avoided.
4) The urea consumption deviation is judged based on the urea pump motor rotating speed deviation, the urea consumption deviation is diagnosed by the difference between the theoretical motor rotating speed and the actual motor rotating speed of the urea pump, faults are sent to the ECU controller through messages to be diagnosed and monitored in real time, the influence caused by the liquid level change of the urea which is artificially filled is avoided, and the diagnosis limitation is effectively overcome.
The invention has the beneficial effects that:
according to the method for diagnosing the urea consumption deviation based on the rotating speed of the pump motor, the urea consumption deviation is judged based on the rotating speed deviation of the urea pump motor, the urea consumption deviation is diagnosed according to the difference between the theoretical motor rotating speed and the actual motor rotating speed of the urea pump, and faults are sent to the ECU controller through messages to be diagnosed and monitored in real time. The method thoroughly solves the problems of complicated calibration of the ECU controller, increased resource occupation, unclear after-sale responsibility, poorer precision and no timeliness of diagnosis in the prior art, and the diagnosis strategy of the invention has the advantages of reducing the after-sale cost and improving the product quality and the competitiveness.
Drawings
FIG. 1 is a schematic diagram of a urea pump module in a method for diagnosing urea consumption deviation based on pump motor speed according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a pump diagnosis strategy in a method for diagnosing a urea consumption deviation based on the rotation speed of a pump motor according to an embodiment of the present invention;
fig. 3 is a pump feedback message interface definition diagram in the method for diagnosing urea consumption deviation based on the rotation speed of the pump motor according to the embodiment of the present invention.
In the attached drawing, 1-urea pump device, 2-ECU controller, 3-motor speed sensor, 4-nozzle.
Detailed Description
The present invention will be described in detail with reference to the accompanying fig. 1 to 3 and the embodiments.
Referring to fig. 1 to 3, the present embodiment provides a method for diagnosing a urea consumption deviation based on a rotation speed of a pump motor, which is applied to a urea pump module. The urea pump module comprises a urea pump device 1 and an ECU controller 2, a motor speed sensor 3 is arranged in the urea pump device 1, the motor speed sensor 3 is electrically connected with the ECU controller 2 after being monitored and diagnosed inside the urea pump device 1, and the urea pump device 1 is further provided with a nozzle 4. The method for diagnosing the urea consumption deviation based on the rotating speed of the pump motor comprises the following steps of:
s1, controlling the nozzle 4 to spray urea outwards by the urea pump device 1, monitoring the motor speed by the motor speed sensor, and monitoring the deviation level of the actual injection quantity by the required injection quantity and the motor speed, and identifying the deviation of the actual urea injection quantity:
s2, judgment: when the urea injection demand is larger than or equal to a set value, the target injection quantity change rate is smaller than the set value, the urea pressure change amplitude is smaller than the set value, the urea injection quantity and the urea pump motor rotating speed are monitored, the difference between the theoretical motor rotating speed difference and the actual motor rotating speed difference is compared, if the difference between the theoretical motor rotating speed difference and the actual motor rotating speed difference is larger than the set value and continuously exceeds the set time, an error event that the actual injection quantity is small once is recorded, when the error event is accumulated and exceeds the set times, a urea consumption too low fault is reported, and fault information is sent to the ECU controller through a message 0x18F2D 43D;
when the urea injection demand is larger than or equal to a set value, the target injection quantity change rate is smaller than the set value, the urea pressure change amplitude is smaller than the set value, the urea injection quantity and the urea pump motor rotating speed are monitored, the difference between the theoretical motor rotating speed difference and the actual motor rotating speed difference is compared, if the difference between the theoretical motor rotating speed difference and the actual motor rotating speed difference is smaller than the set value and continuously exceeds the set time, an error event with larger actual injection quantity is recorded, when the error event is accumulated and exceeds the set times, a fault that the urea consumption is too high is reported, and fault information is sent to the ECU controller through a message 0x18F2D 43D;
the theoretical motor speed difference is the theoretical motor target speed-the motor speed at zero injection quantity, and the actual motor speed difference is the actual motor target speed-the motor speed at zero injection quantity.
Preferably, in the present embodiment, when the number of error events exceeds a predetermined number, a failure that the urea consumption is too low or too high is reported. And calibrating the set times according to the actual condition. The accumulation of error events is too low, which easily causes unstable results and is prone to errors. If the accumulation of error events is too high, the period of fault reporting is affected, and the optimal fault processing time is easily missed.
As a preferable aspect of the present embodiment, the motor rotation speed sensor 3 is electrically connected to the ECU controller 2 through the CAN line after being monitored and diagnosed inside the urea pump apparatus 1, so that the urea pump apparatus 1 CAN quickly and accurately send information to the ECU controller 2.
Fig. 3 is a pump feedback message interface definition diagram in the method for diagnosing urea consumption deviation based on the rotation speed of the pump motor according to the embodiment of the present invention, from which it can be seen that the urea consumption is too high or too low.
According to the method for diagnosing the urea consumption deviation based on the rotating speed of the pump motor, the urea consumption deviation is judged based on the rotating speed deviation of the urea pump motor, the urea consumption deviation is diagnosed according to the difference between the theoretical motor rotating speed and the actual motor rotating speed of the urea pump, faults are sent to the ECU controller through messages, real-time diagnosis and monitoring are carried out, and the accuracy and the real-time performance of diagnosis results are guaranteed.
Although the invention has been described in detail above with reference to specific embodiments, it will be apparent to one skilled in the art that modifications or improvements may be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (2)
1. A method for diagnosing urea consumption deviation based on the rotating speed of a pump motor is characterized by being applied to a urea pump module, wherein the urea pump module comprises a urea pump device and an ECU (electronic control unit) controller, a motor rotating speed sensor is arranged in the urea pump device and is electrically connected with the ECU controller, and the urea pump device is also provided with a nozzle; the method comprises the following steps:
s1, controlling the nozzle to spray urea outwards by the urea pump device, monitoring the motor speed by the motor speed sensor, monitoring the deviation level of the actual injection quantity by the required injection quantity and the motor speed, and identifying the deviation of the actual urea injection quantity:
s2, judgment: when the urea injection demand is larger than or equal to a set value, the target injection quantity change rate is smaller than the set value, the urea pressure change amplitude is smaller than the set value, the urea injection quantity and the urea pump motor rotating speed are monitored, the difference between the theoretical motor rotating speed difference and the actual motor rotating speed difference is compared, if the difference between the theoretical motor rotating speed difference and the actual motor rotating speed difference is larger than the set value and continuously exceeds the set time, an error event that the actual injection quantity is small once is recorded, when the error event is accumulated and exceeds the set times, a urea consumption too low fault is reported, and fault information is sent to the ECU controller through a message 0x18F2D 43D;
when the urea injection demand is larger than or equal to a set value, the target injection quantity change rate is smaller than the set value, the urea pressure change amplitude is smaller than the set value, the urea injection quantity and the urea pump motor rotating speed are monitored, the difference between the theoretical motor rotating speed difference and the actual motor rotating speed difference is compared, if the difference between the theoretical motor rotating speed difference and the actual motor rotating speed difference is smaller than the set value and continuously exceeds the set time, an error event with larger actual injection quantity is recorded, when the error event is accumulated and exceeds the set times, a fault that the urea consumption is too high is reported, and fault information is sent to the ECU controller through a message 0x18F2D 43D;
the theoretical motor speed difference is the motor speed between the theoretical motor target speed and the zero injection amount, and the actual motor speed difference is the motor speed between the actual motor target speed and the zero injection amount.
2. The method for diagnosing urea consumption deviation based on pump motor speed as recited in claim 1, wherein the motor speed sensor is electrically connected to the ECU controller through a CAN line.
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| CN102155279A (en) * | 2011-04-19 | 2011-08-17 | 潍柴动力股份有限公司 | Device and method for controlling urea injection system of diesel engine |
| JP2017082633A (en) * | 2015-10-27 | 2017-05-18 | 株式会社デンソー | Diagnostic system |
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| CN111075544A (en) * | 2019-12-20 | 2020-04-28 | 一汽解放汽车有限公司 | Urea consumption deviation diagnosis method based on urea liquid level sensor |
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| US8316636B2 (en) * | 2006-06-01 | 2012-11-27 | Hitachi Construction Machinery Co., Ltd. | Exhaust gas purifier of construction machine |
| FR2915765B1 (en) * | 2007-05-02 | 2009-06-05 | Renault Sas | METHOD AND SYSTEM FOR DIAGNOSING THE COMPOSITION OF A RESERVOIR TO CONTROL INJECTION ON CATALYST OF REDUCTION OF OXIDES OF NITROGEN |
| CN107060969A (en) * | 2016-12-26 | 2017-08-18 | 潍柴动力空气净化科技有限公司 | SCR spraying systems test device and method |
| CN107060968B (en) * | 2016-12-26 | 2019-11-01 | 潍柴动力股份有限公司 | A kind of method and system judging urea pump pipeline blockage or gas leakage |
| JP6939739B2 (en) * | 2018-08-21 | 2021-09-22 | トヨタ自動車株式会社 | Failure diagnosis device for fluid supply device and failure diagnosis method for fluid supply device |
| CN110925952A (en) * | 2019-12-13 | 2020-03-27 | 雷勃电气(常州)有限公司 | Method for realizing filter screen blockage detection function through motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155279A (en) * | 2011-04-19 | 2011-08-17 | 潍柴动力股份有限公司 | Device and method for controlling urea injection system of diesel engine |
| JP2017082633A (en) * | 2015-10-27 | 2017-05-18 | 株式会社デンソー | Diagnostic system |
| CN107687358A (en) * | 2016-08-04 | 2018-02-13 | 广州市新力汽车技术有限公司 | The control method of air-assisted gas drive SCR system |
| CN111075544A (en) * | 2019-12-20 | 2020-04-28 | 一汽解放汽车有限公司 | Urea consumption deviation diagnosis method based on urea liquid level sensor |
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