CN111322134B - Engine aftertreatment HC injection system and OBD control method thereof - Google Patents
Engine aftertreatment HC injection system and OBD control method thereof Download PDFInfo
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- CN111322134B CN111322134B CN202010242985.4A CN202010242985A CN111322134B CN 111322134 B CN111322134 B CN 111322134B CN 202010242985 A CN202010242985 A CN 202010242985A CN 111322134 B CN111322134 B CN 111322134B
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
- F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
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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
-
- 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
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The application discloses an engine aftertreatment HC injection system, which relates to engine aftertreatment and mainly solves the technical problems that the existing HC injection system has potential safety hazards and cannot accurately diagnose faults. The application also discloses an OBD control method of the engine aftertreatment HC injection system. According to the application, by adding the stop valve, the risk of safety problems caused by fuel leakage into the DPF can be reduced, the electronic oil transfer pump is canceled, the hardware cost can be reduced, and the OBD control method can accurately diagnose faults.
Description
Technical Field
The present application relates to engine aftertreatment, and more particularly, to an engine aftertreatment HC injection system and a method of OBD control thereof.
Background
The existing engine aftertreatment route is DOC1+SCR+HC injection system+DOC2+DPF, and the HC injection system is an electronic fuel transfer pump, an electronic control metering fuel injector and a mechanical nozzle. OBD control for HC injection systems is primarily directed to diagnosing both leakage and clogging of "electronic metering injector + mechanical nozzle", which is based on DOC temperature rise.
The existing HC injection system is only provided with an electric control metering fuel injector and a mechanical nozzle, if the electric control metering fuel injector leaks, a large amount of fuel is injected into the DOC2 and the DPF, and great potential safety hazards exist.
In addition, the temperature rise change (rate) of the DOC2 is used for judging the leakage and blockage faults of the HC injection system, the leakage and blockage faults cannot be distinguished from the diagnosis of the DOC2 efficiency, and when the faults occur, whether the faults are caused by the reduction of the DOC2 efficiency or the blockage of the HC injection system cannot be clearly pointed out.
Disclosure of Invention
The present application has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present application is to provide an engine aftertreatment HC injection system that can improve the safety in use.
The application also provides an OBD control method of the engine aftertreatment HC injection system, which can improve detection accuracy.
In order to achieve the above object, the present application provides an engine aftertreatment HC injection system, which includes a controller, a common rail oil supply unit, an oil path cutting device, a pressure detection device, an electronic metering injector, and a mechanical nozzle, wherein the common rail oil supply unit is sequentially connected with the oil path cutting device, the pressure detection device, the electronic metering injector, and the mechanical nozzle through oil pipes, and the controller is electrically connected with the oil path cutting device, the pressure detection device, and the electronic metering injector.
As a further improvement, the oil passage shut-off device is an oil cut-off solenoid valve.
Further, the pressure detection device is a pressure sensor.
Further, the controller is an engine ECU.
Further, the hydraulic oil line cutting device further comprises a mounting plate for mounting the oil line cutting device and the pressure detection device, wherein a first mounting seat corresponding to the oil line cutting device and a second mounting seat corresponding to the pressure detection device are arranged on the mounting plate.
Further, a protective cover covering the oil way cutting device and the pressure detection device is arranged on the mounting plate, and the protective cover is connected with the mounting plate through bolts.
In order to achieve the second object, the present application provides an OBD control method of an engine aftertreatment HC injection system, the method comprising:
before starting, if the engine is confirmed to be decompressed after the last stop and power-off, reading a pressure value of the pressure detection device after delaying a first set time, and comparing the pressure value with a zero point credible pressure value to diagnose zero point drift of the pressure detection device;
after stopping, the switching oil way cutting device completes pressure relief, the pressure relief state is recorded, the pressure value of the pressure detection device is read after a second set time is delayed, and the pressure value and the zero point credible pressure value are compared to diagnose zero point drift of the pressure detection device;
in a driving cycle under a DPF non-regeneration mode, switching an oil circuit cutting device to charge oil into an oil pipe between the oil circuit cutting device and an electronic metering oil injector, reading a pressure value of the pressure detection device after delaying a third set time, and comparing the pressure value with a full-scale trusted pressure value to diagnose the full scale of the pressure detection device;
if the engine is completely depressurized after the last stop and power-off in the driving cycle under the DPF non-regeneration mode, reading the pressure value of the pressure detection device after delaying the fourth set time, and diagnosing the leakage of the oil circuit cutting device according to the rising condition of the pressure value;
if the engine is completely depressurized after the last stop and power-off in the driving cycle in the DPF non-regeneration mode, opening the oil circuit cutting device, reading the pressure value of the pressure detection device after delaying the fifth set time, and comparing the pressure value with the rising trusted value to diagnose the blockage of the oil circuit cutting device;
in the driving cycle under the DPF non-regeneration mode, switching the oil way cutting device to charge oil into an oil pipe between the oil way cutting device and the electronic metering oil injector, reading a pressure value of the pressure detection device after delaying a sixth set time, and diagnosing leakage of the electronic metering oil injector according to the descending condition of the pressure value;
in a driving cycle in a DPF regeneration mode, switching an oil circuit cutting device to charge oil pipes between the oil circuit cutting device and an electronic metering oil injector, injecting fuel according to a fixed pulse width, reading a pressure value of a pressure detection device after a seventh set time is delayed, calculating a pressure change rate, and comparing the pressure change rate with a first trusted range to perform blockage diagnosis on the electronic metering oil injector or a mechanical nozzle;
in the driving cycle under the DPF regeneration mode, a switching oil circuit cutting device charges oil into an oil pipe between the oil circuit cutting device and an electronic metering oil injector, and fuel is injected according to a specific pulse width, and the pressure value of the pressure detection device is read in real time; when the pressure value is close to the opening pressure of the mechanical nozzle, fuel is injected after pulse width is modified, the pressure value of the pressure detection device is read in real time, and the pressure value is compared with the pressure credible range of the mechanical nozzle to carry out leakage diagnosis on the mechanical nozzle;
and in a driving cycle in a DPF regeneration mode, the switching oil way cutting device charges oil pipes between the oil way cutting device and the electronic metering oil injector, injects fuel according to a fixed pulse width, reads a pressure value of the pressure detection device after an eighth set time is delayed, calculates a pressure change rate, and compares the pressure change rate with a second trusted range to diagnose the oil injection characteristic drift of the electronic metering oil injector and the mechanical nozzle.
Advantageous effects
Compared with the prior art, the application has the advantages that: according to the application, by adding the stop valve, the risk of safety problems caused by fuel leakage into the DPF can be reduced, and meanwhile, the electronic oil transfer pump is canceled, so that the hardware cost can be reduced. The application can diagnose the HC injection system by adopting the pressure change (rate) to replace the temperature change (rate), can realize the diagnosis of a plurality of parts of the HC injection system, can accurately distinguish the DOC2 efficiency from the HC injection system failure, can realize targeted maintenance and improves the maintenance convenience.
Drawings
FIG. 1 is a schematic diagram of the structure of the present application;
fig. 2 is a schematic structural view of the mounting plate according to the present application.
Wherein: 1-controller, 2-common rail oil supply unit, 3-oil circuit cutting device, 4-pressure detection device, 5-electronic metering fuel injector, 6-mechanical nozzle, 7-oil pipe, 8-mounting panel.
Detailed Description
The application will be further described with reference to specific embodiments in the drawings.
Referring to fig. 1-2, an engine aftertreatment HC injection system includes a controller 1, a common rail oil supply unit 2, an oil path cutting device 3, a pressure detection device 4, an electronic metering injector 5, and a mechanical nozzle 6, wherein the common rail oil supply unit 2 is sequentially connected with the oil path cutting device 3, the pressure detection device 4, the electronic metering injector 5, and the mechanical nozzle 6 through an oil pipe 7, and the controller 1 is electrically connected with the oil path cutting device 3, the pressure detection device 4, and the electronic metering injector 5. The controller 1 is used for controlling the oil path cut-off device 3 and the electronic metering injector 5 to work, and reading the oil pressure in the oil pipe 7 through the pressure detection device 4.
The engine aftertreatment HC injection system further comprises a mounting plate 8 for mounting the oil circuit cutting device 3 and the pressure detection device 4, wherein a first mounting seat corresponding to the oil circuit cutting device 3 and a second mounting seat corresponding to the pressure detection device 4 are arranged on the mounting plate 8. The oil circuit cutting device 3 and the pressure detection device 4 are convenient to install and maintain. Be equipped with the protection casing that covers oil circuit cutting device 3, pressure detection device 4 on the mounting panel 8, the protection casing passes through the bolt and is connected with mounting panel 8, and the protection casing can play waterproof dirt-proof effect, protects oil circuit cutting device 3, pressure detection device 4, guarantees oil circuit cutting device 3, pressure detection device 4's job stabilization nature.
Preferably, the oil passage shut-off device 3 is an oil shutoff solenoid valve, the pressure detection device 4 is a pressure sensor, and the controller 1 is an engine ECU.
The HC injection system of the application can at least carry out the following OBD control method:
before starting, if the engine is confirmed to be decompressed after the last stop and power-off, reading the pressure value of the pressure detection device 4 after delaying the first set time, and comparing the pressure value with the zero point credible pressure value to diagnose zero point drift of the pressure detection device 4;
after stopping, the switching oil way cutting device 3 completes pressure relief, records the pressure relief state, reads the pressure value of the pressure detection device 4 after delaying the second set time, and compares the pressure value with the zero point credible pressure value to diagnose zero point drift of the pressure detection device 4;
in the driving cycle under the DPF non-regeneration mode, the switching oil circuit cutting device 3 charges the oil pipe 7 between the oil circuit cutting device 3 and the electronic metering oil injector 5, reads the pressure value of the pressure detection device 4 after delaying for a third set time, compares the pressure value with the full-scale reliable pressure value and diagnoses the full scale of the pressure detection device 4;
if it is confirmed that the engine is completely depressurized after the last stop and power-off in the drive cycle in the DPF non-regeneration mode, the pressure value of the pressure detection device 4 is read after a fourth set time is delayed, the leak diagnosis is performed on the oil passage cutting device 3 according to the rising condition of the pressure value, and if the pressure value is abnormally increased, the leak of the oil passage cutting device 3 is indicated;
if the engine is completely depressurized after the last stop and power-off in the driving cycle in the DPF non-regeneration mode, opening the oil circuit cutting device 3, reading a pressure value of the pressure detection device 4 after a fifth set time is delayed, comparing the pressure value with an ascending trusted value to perform blockage diagnosis on the oil circuit cutting device 3, and if the pressure value is smaller than the ascending trusted value, indicating that the oil circuit cutting device 3 is blocked;
in the driving cycle in the DPF non-regeneration mode, the switching oil path cutting device 3 charges the oil pipe 7 between the oil path cutting device 3 and the electronic metering oil injector 5, reads the pressure value of the pressure detection device 4 after the sixth set time, carries out leakage diagnosis on the electronic metering oil injector 5 according to the descending condition of the pressure value, and if the pressure value abnormally descends, indicates that the electronic metering oil injector 5 leaks;
in the driving cycle in the DPF regeneration mode, the switching oil path cutting device 3 charges the oil pipe 7 between the oil path cutting device 3 and the electronic metering oil injector 5, injects fuel according to a fixed pulse width, reads the pressure value of the pressure detection device 4 after delaying a seventh set time, calculates the pressure change rate, compares the pressure change rate with a first trusted range to perform blockage diagnosis on the electronic metering oil injector 5 or the mechanical nozzle 6, and if the pressure change rate exceeds the first trusted range, indicates that the electronic metering oil injector 5 or the mechanical nozzle 6 is blocked;
in the driving cycle under the DPF regeneration mode, the switching oil way cutting device 3 charges oil in an oil pipe 7 between the oil way cutting device 3 and the electronic metering oil injector 5, and fuel is injected according to a specific pulse width, so that the pressure value of the pressure detection device 4 is read in real time; when the pressure value is close to the opening pressure of the mechanical nozzle 6, the pulse width is modified, the fuel is injected, the pressure value of the pressure detection device 4 is read in real time, the pressure value is compared with the reliable range of the pressure of the mechanical nozzle to carry out leakage diagnosis on the mechanical nozzle 6, and if the pressure value exceeds the reliable range of the pressure of the mechanical nozzle, the leakage of the mechanical nozzle 6 is indicated;
in the driving cycle in the DPF regeneration mode, the switching oil path cut-off device 3 charges the oil pipe 7 between the oil path cut-off device 3 and the electronic metering injector 5 with oil, injects the oil according to a fixed pulse width, reads the pressure value of the pressure detection device 4 after delaying the eighth set time, calculates the pressure change rate, and compares the pressure change rate with the second trusted range to diagnose the drift of the injection characteristics of the electronic metering injector 5 and the mechanical nozzle 6.
The first setting time, the second setting time, the third setting time, the fourth setting time, the fifth setting time, the sixth setting time, the seventh setting time, and the eighth setting time may be set according to a specific model, and the present application is not limited thereto.
In the present embodiment, the switching oil passage cutting device 3 is effective to open and close the oil passage cutting device 3, and the oil pipe 7 between the oil passage cutting device 3 and the electronic metering injector 5 is filled with oil.
According to the application, by adding the stop valve, the risk of safety problems caused by fuel leakage into the DPF can be reduced, and meanwhile, the electronic oil transfer pump is canceled, so that the hardware cost can be reduced. The application can diagnose the HC injection system by adopting the pressure change (rate) to replace the temperature change (rate), can realize the diagnosis of a plurality of parts of the HC injection system, can accurately distinguish the DOC2 efficiency from the HC injection system failure, can realize targeted maintenance and improves the maintenance convenience.
The foregoing is merely a preferred embodiment of the present application, and it should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present application, and these do not affect the effect of the implementation of the present application and the utility of the patent.
Claims (6)
1. The engine aftertreatment HC injection system is characterized by comprising a controller (1), a common rail oil supply unit (2), an oil path cutting device (3), a pressure detection device (4), an electronic metering oil injector (5) and a mechanical nozzle (6), wherein the common rail oil supply unit (2) is sequentially connected with the oil path cutting device (3), the pressure detection device (4), the electronic metering oil injector (5) and the mechanical nozzle (6) through oil pipes (7), and the controller (1) is electrically connected with the oil path cutting device (3), the pressure detection device (4) and the electronic metering oil injector (5);
the OBD control method of the system comprises the following steps:
before starting, if the engine is confirmed to be completely depressurized after the last stop and power-off, reading a pressure value of the pressure detection device (4) after delaying a first set time, and comparing the pressure value with a zero point credible pressure value to diagnose zero point drift of the pressure detection device (4);
after stopping, the switching oil way cutting device (3) finishes pressure relief, records the pressure relief state, reads the pressure value of the pressure detection device (4) after delaying a second set time, and compares the pressure value with a zero point credible pressure value to diagnose zero point drift of the pressure detection device (4);
in a driving cycle under a DPF non-regeneration mode, the switching oil circuit cutting device (3) charges oil in an oil pipe (7) between the oil circuit cutting device (3) and the electronic metering oil injector (5), reads a pressure value of the pressure detection device (4) after delaying a third set time, and compares the pressure value with a full-scale credible pressure value to diagnose the full scale of the pressure detection device (4);
if the engine is completely depressurized after the last stop and power-off in a driving cycle in a DPF non-regeneration mode, reading a pressure value of the pressure detection device (4) after delaying a fourth set time, and diagnosing leakage of the oil circuit cutting device (3) according to the rising condition of the pressure value;
if the engine is completely depressurized after the last stop and power failure is confirmed in a driving cycle in a DPF non-regeneration mode, opening the oil circuit cutting device (3), reading a pressure value of the pressure detection device (4) after a fifth set time is delayed, and comparing the pressure value with a rising trusted value to perform blockage diagnosis on the oil circuit cutting device (3);
in a driving cycle in a DPF non-regeneration mode, a switching oil path cutting device (3) charges an oil pipe (7) between the oil path cutting device (3) and an electronic metering oil injector (5), and reads a pressure value of the pressure detection device (4) after a sixth set time is delayed, and the electronic metering oil injector (5) is subjected to leakage diagnosis according to the descending condition of the pressure value;
in a driving cycle in a DPF regeneration mode, the switching oil way cutting device (3) charges oil in an oil pipe (7) between the oil way cutting device (3) and the electronic metering oil injector (5), fuel is injected according to a fixed pulse width, a pressure value of the pressure detection device (4) is read after a seventh set time is delayed, a pressure change rate is calculated, and the pressure change rate is compared with a first trusted range to perform blockage diagnosis on the electronic metering oil injector (5) or the mechanical nozzle (6);
in the driving cycle under the DPF regeneration mode, the switching oil way cutting device (3) charges oil in an oil pipe (7) between the oil way cutting device (3) and the electronic metering oil injector (5), and fuel is injected according to a specific pulse width, so that the pressure value of the pressure detection device (4) is read in real time; when the pressure value is close to the opening pressure of the mechanical nozzle (6), fuel is injected after pulse width is modified, the pressure value of the pressure detection device (4) is read in real time, and the pressure value is compared with the pressure credible range of the mechanical nozzle to carry out leakage diagnosis on the mechanical nozzle (6);
and in a driving cycle in a DPF regeneration mode, the switching oil way cutting device (3) charges oil pipes (7) between the oil way cutting device (3) and the electronic metering oil injector (5), injects fuel according to a fixed pulse width, reads the pressure value of the pressure detection device (4) after delaying an eighth set time, calculates a pressure change rate, and compares the pressure change rate with a second trusted range to diagnose the oil injection characteristic drift of the electronic metering oil injector (5) and the mechanical nozzle (6).
2. The engine aftertreatment HC injection system according to claim 1, characterized in that the oil circuit shut-off device (3) is a fuel cut-off solenoid valve.
3. The engine aftertreatment HC injection system according to claim 1, characterized in that the pressure detection device (4) is a pressure sensor.
4. The engine aftertreatment HC injection system according to claim 1, characterized in that the controller (1) is an engine ECU.
5. The engine aftertreatment HC injection system according to claim 1, further comprising a mounting plate (8) for mounting the oil passage shut-off device (3) and the pressure detection device (4), wherein the mounting plate (8) is provided with a first mounting seat corresponding to the oil passage shut-off device (3) and a second mounting seat corresponding to the pressure detection device (4).
6. The engine aftertreatment HC injection system according to claim 5, characterized in that a shield covering the oil passage shut-off device (3) and the pressure detection device (4) is provided on the mounting plate (8), and the shield is connected to the mounting plate (8) by bolts.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010242985.4A CN111322134B (en) | 2020-03-31 | 2020-03-31 | Engine aftertreatment HC injection system and OBD control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010242985.4A CN111322134B (en) | 2020-03-31 | 2020-03-31 | Engine aftertreatment HC injection system and OBD control method thereof |
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| CN111322134A CN111322134A (en) | 2020-06-23 |
| CN111322134B true CN111322134B (en) | 2023-09-19 |
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Families Citing this family (3)
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| CN112943429B (en) * | 2021-02-05 | 2022-03-11 | 广西玉柴机器股份有限公司 | Engine aftertreatment HC injection system diagnosis method capable of avoiding air influence |
| CN112943428B (en) * | 2021-02-05 | 2022-04-19 | 广西玉柴机器股份有限公司 | High-accuracy engine aftertreatment HC injection system diagnosis method |
| CN112943427B (en) * | 2021-02-05 | 2022-05-17 | 广西玉柴机器股份有限公司 | Diagnosis method for engine aftertreatment HC injection system |
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