CN111322134A - 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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- CN111322134A CN111322134A CN202010242985.4A CN202010242985A CN111322134A CN 111322134 A CN111322134 A CN 111322134A CN 202010242985 A CN202010242985 A CN 202010242985A CN 111322134 A CN111322134 A CN 111322134A
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- oil
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- detection device
- pressure value
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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
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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
- 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
Abstract
The invention discloses an engine post-processing HC injection system, which relates to engine post-processing and mainly solves the technical problems that the existing HC injection system has potential safety hazard and can not accurately diagnose faults. The invention also discloses an OBD control method of the engine aftertreatment HC injection system. According to the invention, by adding the stop valve, the risk of safety problems caused by fuel oil leakage to the DPF can be reduced, and meanwhile, an electronic fuel delivery pump is cancelled, so that the hardware cost can be reduced, and the OBD control method can accurately diagnose faults.
Description
Technical Field
The present invention relates to engine aftertreatment, and more particularly, it relates to an engine aftertreatment HC injection system and its OBD control method.
Background
The existing engine post-processing route is DOC1+ SCR + HC injection system + DOC2+ DPF, and the HC injection system is an electronic fuel delivery pump + an electric control metering fuel injector + a mechanical nozzle. The OBD control of the HC injection system mainly diagnoses the leakage and blockage of the 'electronic metering injector + mechanical nozzle', and the diagnosis is realized based on DOC temperature rise.
The existing HC injection system is only provided with an electric control metering oil injector and a mechanical nozzle, if the electric control metering oil injector leaks, a large amount of fuel oil is injected into DOC2 and DPF, and great potential safety hazards exist.
Further, the use of the DOC2 temperature rise change (rate) to judge HC injection system leakage and clogging failure cannot be distinguished from the DOC2 efficiency diagnosis, and when a failure occurs, it cannot be clearly specified whether the DOC2 efficiency drop or the HC injection system clogging is caused.
Disclosure of Invention
The technical problem to be solved by the present invention is to solve the above-mentioned shortcomings of the prior art, and an object of the present invention is to provide an engine aftertreatment HC injection system which can improve the safety of use.
The invention also aims to provide an OBD control method of the engine aftertreatment HC injection system, which can improve the detection accuracy.
In order to achieve the first purpose, the invention provides an engine aftertreatment HC injection system, which comprises a controller, a common rail oil supply unit, an oil path cutting device, a pressure detection device, an electronic metering oil 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 oil 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 oil injector.
As a further improvement, the oil path cutoff device is an oil cut solenoid valve.
Further, the pressure detection device is a pressure sensor.
Further, the controller is an engine ECU.
The oil circuit cutting device comprises an oil circuit cutting device body, an oil circuit cutting device body and a pressure detection device body, and is characterized by further comprising a mounting plate used for mounting the oil circuit cutting device body and the pressure detection device body, wherein a first mounting seat corresponding to the oil circuit cutting device body and a second mounting seat corresponding to the pressure detection device body are arranged on the mounting plate.
Furthermore, a protective cover which covers the oil circuit cutting device and the pressure detection device is arranged on the mounting plate, and the protective cover is connected with the mounting plate through a bolt.
In order to achieve the second object, the present invention provides an OBD control method of an engine aftertreatment HC injection system, the method comprising:
before starting, if the pressure relief of the engine is finished after the engine is shut down and powered off last time, 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 the zero point drift of the pressure detection device;
after the pressure detection device is shut down, the oil way switching-off device completes pressure relief, the pressure relief state is recorded, the pressure value of the pressure detection device is read after the second set time is delayed, and the pressure value is compared with the zero point credible pressure value to diagnose the zero point drift of the pressure detection device;
in a driving cycle in a DPF non-regeneration mode, the oil pipe between the oil circuit cutting device and the electronic metering oil injector is filled with oil by switching on and off the oil circuit cutting device, the pressure value of the pressure detection device is read after the third set time is delayed, and the full range of the pressure detection device is diagnosed by comparing the pressure value with the full range credible pressure value;
in a driving cycle in a DPF non-regeneration mode, if the pressure relief of the engine is finished after the engine is stopped and powered off for the last time, reading the pressure value of the pressure detection device after delaying a fourth set time, and performing leakage diagnosis on the oil way cutting device according to the rising condition of the pressure value;
in a driving cycle in a DPF non-regeneration mode, if the pressure relief of the engine is finished after the engine is stopped and powered off for the last time, opening the oil path cut-off device, reading a pressure value of the pressure detection device after delaying a fifth set time, and comparing the pressure value with a rising credible value to perform blockage diagnosis on the oil path cut-off device;
in a driving cycle under a DPF non-regeneration mode, the oil pipe between the oil circuit cutting device and the electronic metering oil injector is filled with oil by switching the oil circuit cutting device, the pressure value of the pressure detection device is read after the sixth set time is delayed, and the electronic metering oil injector is subjected to leakage diagnosis 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 fill oil into an oil pipe between the oil circuit cutting device and an electronic metering oil injector, injecting fuel oil according to a fixed pulse width, reading a pressure value of a pressure detection device after delaying a seventh set time, calculating a pressure change rate, and comparing the pressure change rate with a first reliable range to perform blockage diagnosis on the electronic metering oil injector or a mechanical nozzle;
in a driving cycle in a DPF regeneration mode, switching an oil circuit cutting device to fill oil into an oil pipe between the oil circuit cutting device and an electronic metering oil injector, injecting fuel oil according to a specific pulse width, and reading a pressure value of a pressure detection device in real time; when the pressure value is close to the opening pressure of the mechanical nozzle, fuel oil is injected after the pulse width is modified, the pressure value of the pressure detection device is read in real time, and the pressure value is compared with a reliable range of the pressure of the mechanical nozzle to perform leakage diagnosis on the mechanical nozzle;
and in the driving circulation under the DPF regeneration mode, the oil pipe between the oil circuit cutting device and the electronic metering oil injector is filled with oil by the oil circuit cutting device, fuel oil is injected according to a fixed pulse width, the pressure value of the pressure detection device is read after the eighth set time is delayed, the pressure change rate is calculated, and the pressure change rate is compared with a second credible 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 invention has the advantages that: according to the invention, the risk of safety problems caused by fuel oil leakage to the DPF can be reduced by adding the stop valve, and meanwhile, the hardware cost can be reduced by canceling the electronic fuel delivery pump. The invention 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 and the HC injection system fault, can realize targeted maintenance and improve the convenience of the maintenance.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of the mounting plate of the present invention.
Wherein: the device comprises a controller 1, a common rail oil supply unit 2, an oil circuit cutting device 3, a pressure detection device 4, an electronic metering oil injector 5, a mechanical nozzle 6, an oil pipe 7 and an installation plate 8.
Detailed Description
The invention will be further described with reference to specific embodiments shown 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 cut-off device 3, a pressure detection device 4, an electronic metering injector 5, and a mechanical nozzle 6, where the common rail oil supply unit 2 is connected to the oil path cut-off device 3, the pressure detection device 4, the electronic metering injector 5, and the mechanical nozzle 6 in sequence through an oil pipe 7, and the controller 1 is electrically connected to the oil path cut-off device 3, the pressure detection device 4, and the electronic metering injector 5. The controller 1 is used for controlling the oil circuit cutting 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 used 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 way 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 measurement 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 measurement device 4, guarantees oil circuit cutting device 3, pressure measurement device 4's job stabilization nature.
Preferably, the oil passage blocking device 3 is a fuel cut solenoid valve, the pressure detecting device 4 is a pressure sensor, and the controller 1 is an engine ECU.
The HC injection system described herein can perform at least the following OBD control methods:
before starting, if the pressure relief of the engine is finished after the engine is shut down and powered off last time, reading the pressure value of the pressure detection device 4 after delaying the first set time, and comparing the pressure value with a zero-point credible pressure value to diagnose the zero-point drift of the pressure detection device 4;
after the machine is shut down, the oil circuit switching-off 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 the zero-point drift of the pressure detection device 4;
in a driving cycle in a DPF non-regeneration mode, the oil pipe 7 between the oil circuit cutting device 3 and the electronic metering oil injector 5 is filled with oil by switching on and off the oil circuit cutting device 3, the pressure value of the pressure detection device 4 is read after the third set time is delayed, and the full range of the pressure detection device 4 is diagnosed by comparing the pressure value with the full range credible pressure value;
in the driving cycle in the DPF non-regeneration mode, if the pressure relief of the engine is finished after the power off of the engine is stopped last time, reading the pressure value of the pressure detection device 4 after delaying the fourth set time, carrying out leakage diagnosis on the oil path cutting device 3 according to the rising condition of the pressure value, and if the pressure value abnormally rises, indicating that the oil path cutting device 3 has leakage;
in a driving cycle in a DPF non-regeneration mode, if the pressure relief of the engine is finished after the engine is stopped and powered off for the last time, opening the oil circuit cutting device 3, reading the pressure value of the pressure detection device 4 after delaying the fifth set time, comparing the pressure value with a rising confidence value to perform blockage diagnosis on the oil circuit cutting device 3, and if the pressure value is smaller than the rising confidence value, indicating that the oil circuit cutting device 3 is blocked;
in a driving cycle in a DPF non-regeneration mode, the oil pipe 7 between the oil circuit cutting device 3 and the electronic metering oil injector 5 is filled with oil by switching the oil circuit cutting device 3, the pressure value of the pressure detection device 4 is read after the sixth set time is delayed, leakage diagnosis is carried out on the electronic metering oil injector 5 according to the descending condition of the pressure value, and if the pressure value is abnormally reduced, the electronic metering oil injector 5 is indicated to have leakage;
in a driving cycle in a DPF regeneration mode, switching the oil circuit cutting device 3 to fill oil into an oil pipe 7 between the oil circuit cutting device 3 and the electronic metering oil injector 5, injecting fuel oil according to a fixed pulse width, delaying a seventh set time, reading a pressure value of the pressure detection device 4, calculating a pressure change rate, comparing the pressure change rate with a first reliable 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 reliable range, indicating that the electronic metering oil injector 5 or the mechanical nozzle 6 is blocked;
in a driving cycle in a DPF regeneration mode, the oil pipe 7 between the oil circuit cutting device 3 and the electronic metering oil injector 5 is filled with oil by switching the oil circuit cutting device 3 on and off, fuel oil is injected according to a specific pulse width, and 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 oil is injected after the pulse width is modified, the pressure value of the pressure detection device 4 is read in real time, the pressure value is compared with a 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 represented;
in a driving cycle in a DPF regeneration mode, the oil pipe 7 between the oil circuit cutting device 3 and the electronic metering oil injector 5 is filled with oil by switching the oil circuit cutting device 3 on and off, fuel oil is injected according to a fixed pulse width, the pressure value of the pressure detection device 4 is read after the eighth set time is delayed, the pressure change rate is calculated, and the pressure change rate is compared with a second credible range to diagnose the drift of the oil injection characteristics of the electronic metering oil injector 5 and the mechanical nozzle 6.
The first set time, the second set time, the third set time, the fourth set time, the fifth set time, the sixth set time, the seventh set time, and the eighth set time may be set according to a specific model, and the present invention is not particularly limited.
In the present embodiment, switching the oil passage cut-off device 3 means effectively opening and closing the oil passage cut-off device 3, and filling the oil pipe 7 between the oil passage cut-off device 3 and the electronic metering injector 5 with oil.
According to the invention, the risk of safety problems caused by fuel oil leakage to the DPF can be reduced by adding the stop valve, and meanwhile, the hardware cost can be reduced by canceling the electronic fuel delivery pump. The invention 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 and the HC injection system fault, can realize targeted maintenance and improve the convenience of the maintenance.
The above is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that several variations and modifications can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (7)
1. The HC injection system for the post-processing of the engine is characterized by comprising a controller (1), a common rail oil supply unit (2), an oil circuit 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 circuit cutting device (3), the pressure detection device (4), the electronic metering oil injector (5) and the mechanical nozzle (6) through an oil pipe (7), and the controller (1) is electrically connected with the oil circuit cutting device (3), the pressure detection device (4) and the electronic metering oil injector (5).
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. An engine aftertreatment HC injection system according to claim 1, wherein the pressure detection means (4) is a pressure sensor.
4. An engine aftertreatment HC injection system according to claim 1, wherein 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 circuit shutoff device (3) and the pressure detection device (4), wherein a first mounting seat corresponding to the oil circuit shutoff device (3) and a second mounting seat corresponding to the pressure detection device (4) are provided on the mounting plate (8).
6. The engine aftertreatment HC injection system according to claim 5, wherein a protective cover that covers the oil passage shut-off device (3) and the pressure detection device (4) is provided on the mounting plate (8), and the protective cover is connected to the mounting plate (8) by a bolt.
7. An OBD control method of an engine aftertreatment HC injection system, the method comprising:
before starting, if the pressure relief of the engine is finished after the engine is stopped and powered off for the last time, 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 the zero-point drift of the pressure detection device (4);
after the machine is shut down, the oil circuit switching-off device (3) completes pressure relief, the pressure relief state is recorded, the pressure value of the pressure detection device (4) is read after the second set time is delayed, and the pressure value is compared with the zero-point credible pressure value to diagnose the zero-point drift of the pressure detection device (4);
in a driving cycle under a DPF non-regeneration mode, the oil pipe (7) between the oil circuit cut-off device (3) and the electronic metering oil injector (5) is filled with oil by switching on and off the oil circuit cut-off device (3), the pressure value of the pressure detection device (4) is read after the third set time is delayed, and the full range of the pressure detection device (4) is diagnosed by comparing the pressure value with the full range credible pressure value;
in a driving cycle in a DPF non-regeneration mode, if the pressure relief of the engine is finished after the engine is stopped and powered off for the last time, reading the pressure value of the pressure detection device (4) after delaying a fourth set time, and performing leakage diagnosis on the oil way cutting device (3) according to the rising condition of the pressure value;
in a driving cycle in a DPF non-regeneration mode, if the pressure relief of the engine is finished after the engine is stopped and powered off for the last time, opening the oil path cut-off device (3), reading a pressure value of the pressure detection device (4) after delaying a fifth set time, and comparing the pressure value with an ascending credible value to perform blockage diagnosis on the oil path cut-off device (3);
in a driving cycle under a DPF non-regeneration mode, the oil pipe (7) between the oil way cut-off device (3) and the electronic metering oil injector (5) is filled with oil by switching the oil way cut-off device (3), the pressure value of the pressure detection device (4) is read after the 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 oil pipe (7) between the oil way cut-off device (3) and the electronic metering oil injector (5) is filled with oil by switching the oil way cut-off device (3), fuel oil is injected according to a fixed pulse width, the pressure value of the pressure detection device (4) is read after a seventh set time is delayed, the pressure change rate is calculated, and the electronic metering oil injector (5) or the mechanical nozzle (6) is subjected to blockage diagnosis by comparing the pressure change rate with a first reliable range;
in a driving cycle in a DPF regeneration mode, the oil pipe (7) between the oil circuit cutting device (3) and the electronic metering oil injector (5) is filled with oil by switching the oil circuit cutting device (3), fuel oil is injected according to a specific pulse width, and 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 oil is injected after the 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 a reliable range of the mechanical nozzle pressure to perform leakage diagnosis on the mechanical nozzle (6);
in a driving cycle in a DPF regeneration mode, the oil pipe (7) between the oil way cut-off device (3) and the electronic metering oil injector (5) is filled with oil through the oil way cut-off device (3) in a switching mode, fuel oil is injected according to a fixed pulse width, the pressure value of the pressure detection device (4) is read after the eighth set time is delayed, the pressure change rate is calculated, and the pressure change rate is compared with a second reliable range to diagnose the drift of the oil injection characteristics of the electronic metering oil injector (5) and the mechanical nozzle (6).
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| CN112943427A (en) * | 2021-02-05 | 2021-06-11 | 广西玉柴机器股份有限公司 | Diagnosis method for engine aftertreatment HC injection system |
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| CN111322134B (en) | 2023-09-19 |
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