CN112943427B - Diagnosis method for engine aftertreatment HC injection system - Google Patents
Diagnosis method for engine aftertreatment HC injection system Download PDFInfo
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- CN112943427B CN112943427B CN202110162484.XA CN202110162484A CN112943427B CN 112943427 B CN112943427 B CN 112943427B CN 202110162484 A CN202110162484 A CN 202110162484A CN 112943427 B CN112943427 B CN 112943427B
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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
- F01N3/02—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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- 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 diagnosis method for an engine aftertreatment HC injection system, which relates to the technical field of HC injection system diagnosis and solves the technical problem of fault misinformation caused by the existing diagnosis mode, and comprises the following steps: acquiring the running state of an engine, the rotating speed of the engine, the fuel injection pulse width, the state of a fuel pressure sensor, the temperature of a cooling liquid and the running time of the engine; marking each combustion mode of the working process of the engine as a regeneration mode and a non-regeneration mode; acquiring a combustion mode of actual work of an engine; setting the temperature delay and the rotation speed delay of the cooling liquid; if the engine running state is met, the oil injection pulse width is met, the fuel pressure sensor state is met, the combustion mode is a non-regeneration mode, the engine speed meets the condition that the engine enters the diagnosis lowest speed combined with the speed delay, the coolant temperature meets the condition that the engine enters the diagnosis lowest temperature combined with the coolant temperature delay, and the engine running time is larger than or equal to the time limit value, the HC injection system is allowed to be diagnosed; otherwise, no HC injection system diagnostics are allowed.
Description
Technical Field
The invention relates to the technical field of HC injection system diagnosis, in particular to a diagnosis method for an engine aftertreatment HC injection system.
Background
The HC injection system for the engine aftertreatment is a device which is arranged behind the second stage of the engine aftertreatment system and is used for heating DOC and promoting DPF regeneration. It can be understood that the injection of diesel fuel at the far end of the engine initiates combustion in a high exhaust temperature environment, which causes the DOC to rapidly heat up, and promotes DPF regeneration.
Current diagnostics of HC injection systems include: the method comprises the steps of fuel pressure sensor rationality fault diagnosis (diagnosis after shutdown), HC cut-off valve leakage diagnosis, fuel pressure sensor rationality diagnosis HI (diagnosis in operation), nozzle leakage fault diagnosis, nozzle blockage fault diagnosis and nozzle fuel injection characteristic drift fault diagnosis, wherein the 8 faults are sequentially carried out according to the sequence.
The existing general diagnostic logic only takes the engine running state, the engine speed, the fuel injection pulse width and the fuel pressure sensor state into consideration, and as shown in fig. 1, when the engine running state, the engine speed, the fuel injection pulse width and the fuel pressure sensor state are all satisfied, the HC injection system fault diagnosis can be started. The existing diagnosis mode can not avoid the problems of HC injection system diagnosis (OBD control stop valve switch) and regeneration conflict caused by that oil supplied by an oil pump is insufficient to fill an HC oil injection pipe when an engine is in cold start, so that fault misinformation is caused, and the problem that the HC injection system diagnosis (OBD control stop valve switch) and regeneration conflict caused by immediate regeneration can not be avoided when an engine is in hot start can not be avoided.
Disclosure of Invention
The technical problem to be solved by the present invention is to solve the above-mentioned deficiencies of the prior art, and the object of the present invention is to provide a diagnostic method for an engine aftertreatment HC injection system, which can improve the diagnostic accuracy.
The technical scheme of the invention is as follows: an engine aftertreatment (HC) injection system diagnostic method comprising:
acquiring the running state of an engine, the rotating speed of the engine, the fuel injection pulse width, the state of a fuel pressure sensor, the temperature of a cooling liquid and the running time of the engine;
marking each combustion mode of the working process of the engine as a regeneration mode and a non-regeneration mode; acquiring a combustion mode of actual work of an engine;
setting the temperature delay and the rotation speed delay of the cooling liquid;
if the engine running state is met, the oil injection pulse width is met, the fuel pressure sensor state is met, the combustion mode is a non-regeneration mode, the engine speed meets the condition that the engine enters the diagnosis lowest speed combined with the speed delay, the coolant temperature meets the condition that the engine enters the diagnosis lowest temperature combined with the coolant temperature delay, and the engine running time is larger than or equal to the time limit value, the HC injection system is allowed to be diagnosed; otherwise, no HC injection system diagnostics are allowed.
As a further improvement, the regeneration mode is an operation process of DPF regeneration of the engine, and the non-regeneration mode is an operation process of not carrying out DPF regeneration on the engine.
Further, the lowest diagnostic rotating speed is 700-800 rpm, and the rotating speed delay is 100-150 rpm; the combination of the engine speed meeting the minimum diagnostic speed and the speed delay is specifically as follows: if the engine speed is in an ascending state and reaches the lowest diagnostic speed, allowing to enter HC injection system diagnosis; if the engine speed is in a descending state and the engine speed is not less than the lowest diagnostic speed, namely the engine speed is delayed, allowing to enter an HC injection system for diagnosis; otherwise, no HC injection system diagnostics are allowed.
Further, the lowest diagnosis temperature is-7 to-5 ℃, and the temperature lag of the cooling liquid is 3 to 5 ℃; the coolant temperature meeting the minimum diagnostic temperature combined with coolant temperature hysteresis is specifically: if the coolant temperature is in an ascending state and reaches the lowest diagnosis entering temperature, the HC injection system diagnosis is allowed to enter; if the coolant temperature is in a descending state and the coolant temperature is not lower than the minimum diagnostic temperature-coolant temperature hysteresis, allowing to enter HC injection system diagnosis; otherwise, no HC injection system diagnostics are allowed.
Further, the time limit is 15s to 20 s.
Advantageous effects
Compared with the prior art, the invention has the advantages that:
according to the invention, the HC injection system can be allowed to enter for diagnosis only by judging that the combustion mode is the non-regeneration mode, so that the conflict between diagnosis and regeneration caused by directly entering the regeneration mode after the heat engine is started can be avoided; by judging that the engine speed meets the condition of entering the diagnosis lowest speed and combining with the speed delay, the frequent entering and exiting of the diagnosis after the speed reaches or is less than the entering diagnosis lowest speed can be avoided; by judging whether the temperature of the cooling liquid meets the minimum entering diagnosis temperature and combining with the temperature delay of the cooling liquid, the situation that the cooling liquid frequently enters and exits diagnosis when the temperature of the cooling liquid reaches or is lower than the minimum entering diagnosis temperature during the cold start of the engine can be avoided; by judging that the running time of the engine is larger than or equal to the time limit value, the risk that the oil pump supplies oil to the engine and the HC system at the same time when the engine is in cold start and the oil pump supplies oil insufficiently to fill an HC oil injection pipe can be avoided, the diagnosis accuracy can be improved, and the false alarm of faults can be greatly reduced.
Drawings
FIG. 1 is a schematic diagram of a conventional technique;
FIG. 2 is a schematic diagram of the present invention.
Detailed Description
The invention will be further described with reference to specific embodiments shown in the drawings.
Referring to FIG. 2, an engine aftertreatment HC injection system diagnostic method includes:
acquiring the running state of an engine, the rotating speed of the engine, the fuel injection pulse width, the state of a fuel pressure sensor, the temperature of a cooling liquid and the running time of the engine;
marking each combustion mode of the working process of the engine as a regeneration mode and a non-regeneration mode; acquiring a combustion mode of actual work of an engine;
setting the temperature delay and the rotation speed delay of the cooling liquid;
if the engine running state is met, the oil injection pulse width is met, the fuel pressure sensor state is met, the combustion mode is a non-regeneration mode, the engine speed meets the condition that the engine enters the diagnosis lowest speed combined with the speed delay, the coolant temperature meets the condition that the engine enters the diagnosis lowest temperature combined with the coolant temperature delay, and the engine running time is larger than or equal to the time limit value, the HC injection system is allowed to be diagnosed; otherwise, no HC injection system diagnostics are allowed.
In this embodiment, the regeneration mode is an operation of regenerating the DPF of the engine, the non-regeneration mode is an operation of not performing the DPF regeneration of the engine, and the regeneration mode may be automatically entered or manually set to be entered. The HC injection system diagnosis can be allowed to enter only by judging that the combustion mode is the non-regeneration mode, so that the conflict between diagnosis and regeneration caused by directly entering the regeneration mode after the heat engine is started can be avoided.
The lowest diagnostic rotation speed is 700-800 rpm, and the rotation speed delay is 100-150 rpm; the combination of the engine speed meeting the minimum diagnostic speed and the speed delay is specifically as follows: if the engine speed is in an ascending state and reaches the lowest diagnostic speed, allowing to enter HC injection system diagnosis; if the engine speed is in a descending state and the engine speed is not less than the lowest diagnostic speed, namely the engine speed is delayed, allowing to enter an HC injection system for diagnosis; otherwise, no HC injection system diagnostics are allowed. For example, when the engine reaches the lowest diagnostic rotation speed of 700rpm, the diagnosis is started, when the rotation speed fluctuates to 700-600 rpm, the diagnosis is still carried out, and when the rotation speed is lower than 600rpm, the diagnosis is forbidden; but when the rotating speed is increased from 600rpm to 600-700 rpm, the diagnosis is still forbidden, and when the rotating speed reaches 700rpm, the diagnosis is re-allowed to enter. By judging that the engine speed meets the minimum entering diagnosis speed and combining with the speed delay, the situation that the engine frequently enters and exits the diagnosis after the speed reaches or is less than the minimum entering diagnosis speed can be avoided.
The lowest diagnosis temperature is-7 to-5 ℃, and the temperature delay of the cooling liquid is 3 to 5 ℃; the coolant temperature meeting the entry into the diagnostic minimum temperature in combination with coolant temperature hysteresis is specifically: if the coolant temperature is in an ascending state and reaches the lowest diagnosis entering temperature, the HC injection system diagnosis is allowed to enter; if the coolant temperature is in a descending state and the coolant temperature is not less than the entering diagnosis minimum temperature-coolant temperature hysteresis, entering HC injection system diagnosis; otherwise, no HC injection system diagnostics are allowed. For example, the coolant temperature reaches the lowest diagnostic temperature of-7 ℃, diagnosis is performed, diagnosis is still performed when the coolant temperature fluctuates between-7 ℃ and-10 ℃, and diagnosis is prohibited when the coolant temperature is lower than-10 ℃; when the temperature of the cooling liquid is increased to-10 to-7 ℃, the diagnosis is still forbidden, and when the temperature of the cooling liquid reaches the lowest diagnosis entering temperature of-7 ℃, the diagnosis entering is re-allowed. By judging that the coolant temperature meets the minimum entering diagnosis temperature and combining with coolant temperature hysteresis, frequent entering and exiting diagnosis when the coolant temperature reaches or is lower than the minimum entering diagnosis temperature during cold start of the engine can be avoided.
The time limit is 15 s-20 s. By judging that the running time of the engine is larger than or equal to the time limit value, the risk that the oil pump supplies oil to the engine and the HC system at the same time and the oil pump supplies oil insufficiently to fill the HC oil injection pipe when the engine is in cold start can be avoided.
The minimum entering diagnosis rotating speed, the rotating speed delay, the minimum entering diagnosis temperature, the cooling liquid temperature delay and the time limit value can be calibrated according to the actual model, and the given values are the optimal empirical values in the embodiment. The invention can improve the diagnosis accuracy and greatly reduce the false alarm of the fault.
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 (3)
1. An engine aftertreatment HC injection system diagnostic method comprising:
acquiring the running state of an engine, the rotating speed of the engine, the fuel injection pulse width, the state of a fuel pressure sensor, the temperature of a cooling liquid and the running time of the engine;
marking each combustion mode of the working process of the engine as a regeneration mode and a non-regeneration mode; acquiring a combustion mode of actual work of an engine;
setting the temperature delay and the rotation speed delay of the cooling liquid;
if the engine running state is met, the oil injection pulse width is met, the fuel pressure sensor state is met, the combustion mode is a non-regeneration mode, the engine speed meets the condition that the engine enters the diagnosis lowest speed combined with the speed delay, the coolant temperature meets the condition that the engine enters the diagnosis lowest temperature combined with the coolant temperature delay, and the engine running time is larger than or equal to the time limit value, the HC injection system is allowed to be diagnosed; otherwise, not allowing access to HC injection system diagnostics;
the minimum diagnostic rotating speed is 700-800 rpm, and the rotating speed delay is 100-150 rpm; the combination of the engine speed meeting the minimum diagnostic speed and the speed delay is specifically as follows: if the engine speed is in an ascending state and reaches the lowest diagnostic speed, allowing to enter HC injection system diagnosis; if the engine speed is in a descending state and the engine speed is not less than the lowest diagnostic speed, namely the engine speed is delayed, allowing to enter an HC injection system for diagnosis; otherwise, not allowing access to HC injection system diagnostics;
the lowest diagnosis temperature is-7 to-5 ℃, and the temperature delay of the cooling liquid is 3 to 5 ℃; the coolant temperature meeting the minimum diagnostic temperature combined with coolant temperature hysteresis is specifically: if the coolant temperature is in an ascending state and reaches the lowest diagnosis entering temperature, the HC injection system diagnosis is allowed to enter; if the coolant temperature is in a descending state and the coolant temperature is not less than the entering diagnosis minimum temperature-coolant temperature hysteresis, entering HC injection system diagnosis; otherwise, no HC injection system diagnostics are allowed.
2. The engine aftertreatment HC injection system diagnostic method of claim 1, wherein the regeneration mode is an operation of engine DPF regeneration, and the non-regeneration mode is an operation of engine without DPF regeneration.
3. An engine aftertreatment HC injection system diagnostic method according to claim 1, wherein the time limit is 15 s-20 s.
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