CN112211702A - Control method and device for DPF active regeneration oil injection system - Google Patents

Control method and device for DPF active regeneration oil injection system Download PDF

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Publication number
CN112211702A
CN112211702A CN202011028714.5A CN202011028714A CN112211702A CN 112211702 A CN112211702 A CN 112211702A CN 202011028714 A CN202011028714 A CN 202011028714A CN 112211702 A CN112211702 A CN 112211702A
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state
fuel
valve
dpf
pressure
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CN112211702B (en
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韩虎
陈玉俊
王梅俊
李芳�
郑攀
杨晓莹
程欢
蒋学锋
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Dongfeng Trucks Co ltd
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Dongfeng Trucks Co ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00Electrical control of exhaust gas treating apparatus
    • F01N9/002Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust 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
    • F01N3/023Exhaust 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
    • F01N3/025Exhaust 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
    • F01N3/0253Exhaust 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
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/40Engine 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)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

The application relates to a control method and a device for a DPF active regeneration oil injection system, which relate to the technical field of automobiles, and the method comprises the following steps: when the engine is not in the DPF active regeneration state, detecting the working states of a fuel cut-off valve and a fuel metering valve; detecting the magnitude of the regeneration oil supply pressure, and comparing the magnitude with a preset first pressure threshold value and a preset second pressure threshold value to obtain a pressure comparison result; according to the working state of the fuel cut-off valve and the fuel metering valve, the pressure comparison result and the temperature difference value between the DPF inlet temperature and the DOC inlet temperature, the out-of-control state judgment is carried out, and a state judgment result is obtained; and regulating and controlling the engine according to the state judgment result. According to the fuel cut-off valve and the fuel metering valve, the out-of-control state of the DPF active regeneration fuel injection system is judged according to the working state, the pressure comparison result and the temperature difference value, corresponding protection measures are taken, and safety guarantee is provided for vehicle running.

Description

Control method and device for DPF active regeneration oil injection system
Technical Field
The invention relates to the technical field of automobiles, in particular to a control method and a device for a DPF active regeneration oil injection system.
Background
DPF (Diesel Particulate Filter) technology is considered to be the most effective means for dealing with the emission of Diesel Particulate matter, and a DPF honeycomb-shaped ceramic carrier structure can effectively Filter and trap the Particulate matter in the exhaust gas of the Diesel engine. In the filtering and trapping process, as particulate matter is accumulated in the DPF, exhaust back pressure of the diesel engine rises to deteriorate the performance of the diesel engine, and it is necessary to periodically remove particulates in the DPF to restore the DPF to an initial state and regenerate the DPF.
For medium and heavy Diesel engines, to realize the active regeneration of the DPF, an active regeneration fuel injection system of the DPF is generally installed at the front end of a DOC (Diesel Oxidation Catalyst), fuel oil is injected into an exhaust pipe at the front end of the DOC, and a large amount of heat is released through the Oxidation of the DOC to raise the exhaust temperature inside the DPF downstream, so as to achieve high-temperature Oxidation of particulate matters.
The DPF active regeneration oil injection system has the function of controlling the amount of fuel oil injected into the exhaust pipe when the DPF is actively regenerated, and a great deal of fuel oil can be injected into the exhaust pipe when the regeneration oil injection system has a leakage fault or control failure, so that great potential safety hazards exist. Therefore, the control process of the DPF active regeneration oil injection system must be monitored, so that the regeneration oil injection system can be timely coped with and processed once an out-of-control state exists, and vehicle safety accidents are avoided.
Therefore, in order to meet the performance requirement, a control scheme of the DPF active regeneration fuel injection system is urgently needed.
Disclosure of Invention
The application provides a control method of a DPF active regeneration oil injection system, which is characterized in that the out-of-control state of the DPF active regeneration oil injection system is judged according to the working state, the pressure comparison result and the temperature difference value of a fuel oil cut-off valve and a fuel oil metering valve, and corresponding protective measures are taken to provide safety guarantee for the running of a vehicle.
In a first aspect, the present application provides a DPF active regeneration fuel injection system control method, comprising the steps of:
when the engine is not in the DPF active regeneration state, detecting the working states of a fuel cut-off valve and a fuel metering valve;
detecting the magnitude of the regeneration oil supply pressure, and comparing the magnitude with a preset first pressure threshold value and a preset second pressure threshold value to obtain a pressure comparison result;
according to the working state of the fuel cut-off valve and the fuel metering valve, the pressure comparison result and the temperature difference value between the DPF inlet temperature and the DOC inlet temperature, performing out-of-control state judgment to obtain a state judgment result;
and regulating and controlling the engine according to the state judgment result.
Specifically, the detecting of the regeneration oil supply pressure and the comparing with a preset first pressure threshold and a preset second pressure threshold to obtain a pressure comparison result specifically includes the following steps:
detecting to obtain the magnitude of the regeneration oil supply pressure;
when the numerical value of the regenerative oil supply pressure is not larger than a first pressure threshold value and the state maintaining time exceeds a third time threshold value, judging that the regenerative oil supply pressure belongs to a first preset pressure interval;
and when the numerical value of the regenerative oil supply pressure is greater than the first pressure threshold and not greater than the second pressure threshold and the state maintaining time exceeds a fourth time threshold, judging that the regenerative oil supply pressure belongs to a second preset pressure interval.
Specifically, according to the working condition of fuel trip valve with fuel metering valve, pressure ratio result and DPF inlet temperature and DOC inlet temperature's difference in temperature, carry out the out of control state and judge, obtain the state judgement result, it includes:
judging that the DPF active regeneration oil injection system is in a first-stage fault state;
judging that the DPF active regeneration fuel injection system is in a second-stage fault state;
and determining that the DPF active regeneration fuel injection system is in a third-stage fault state.
Specifically, when the DPF active regeneration fuel injection system is in the first-stage fault state, the following conditions are specifically included:
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value, the state maintaining time exceeds a preset first calibration time, the fuel cut-off valve and the fuel metering valve are in a driving state, and the regeneration fuel supply pressure belongs to a first preset pressure interval;
the temperature difference value of DPF inlet temperature and DOC inlet temperature is less than first difference in temperature threshold value to state holding time surpasss the first calibration time of predetermineeing, the fuel trip valve is in the drive condition, the fuel metering valve is in non-drive state, just regeneration fuel feeding pressure size belongs to first predetermined pressure interval.
Specifically, when the DPF active regeneration fuel injection system is in the second-stage fault state, the following conditions are specifically included:
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value, the state maintaining time exceeds a preset first calibration time, the fuel cut-off valve is in a non-driving state, the fuel metering valve is in a driving state, and the regeneration fuel supply pressure belongs to a first preset pressure interval;
the temperature difference value of DPF inlet temperature and DOC inlet temperature is less than first difference in temperature threshold value to state holding time surpasss the first calibration time of predetermineeing, the fuel trip valve is in the drive condition, the fuel metering valve is in non-drive state, just regeneration fuel feeding pressure size belongs to the second and predetermines the pressure interval.
Specifically, when the DPF active regeneration fuel injection system is in the third-stage fault state, the following conditions are specifically included:
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value, the state maintaining time exceeds a preset first calibration time, the fuel cut-off valve and the fuel metering valve are in a driving state, and the regeneration fuel supply pressure belongs to a second preset pressure interval;
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value, the state maintaining time exceeds a preset first calibration time, the fuel cut-off valve is in a non-driving state, the fuel metering valve is in a driving state, and the regeneration fuel supply pressure belongs to a second preset pressure interval;
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value, the state maintaining time exceeds a preset first calibration time, the fuel cut-off valve and the fuel metering valve are in a non-driving state, and the regeneration fuel supply pressure belongs to a second preset pressure interval;
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is not less than a first temperature difference threshold value, the state maintaining time exceeds the first calibration time, and any one of the fuel cut-off valve and the fuel metering valve is in a driving state.
Specifically, the controlling the engine according to the state determination result specifically includes the following steps:
when the DPF active regeneration oil injection system is in a first-stage fault state, carrying out speed-limiting operation on the engine;
when the DPF active regeneration oil injection system is in a second-stage fault state, carrying out speed limit operation and torque limit operation on the engine;
and when the DPF active regeneration oil injection system is in a third-stage fault state, stopping the engine.
Further, before the detecting the operating states of the fuel cut valve and the fuel metering valve, the method further comprises the steps of:
and identifying the state of a DPF active regeneration activation identifier, if the DPF active regeneration activation identifier is in an activated state, determining that the engine is in a DPF active regeneration state, and if the DPF active regeneration activation identifier is in an inactivated state, determining that the engine is not in the DPF active regeneration state.
Specifically, when the working state of the fuel cut-off valve is detected, the method specifically comprises the following steps:
and identifying the driving signal of the fuel cut-off valve, and when the value of the driving signal of the fuel cut-off valve is not less than a first preset threshold value and the state retention time exceeds a first time threshold value, judging that the fuel cut-off valve is in a driving state, otherwise, judging that the fuel cut-off valve is in a non-driving state.
In a second aspect, the present application provides a DPF active regeneration fuel injection system control apparatus, the apparatus comprising:
the working state detection module is used for detecting the working states of the fuel cut-off valve and the fuel metering valve when the engine is not in the DPF active regeneration state;
the regeneration oil supply pressure detection module is used for detecting the magnitude of regeneration oil supply pressure and comparing the magnitude of the regeneration oil supply pressure with a preset first pressure threshold and a preset second pressure threshold to obtain a pressure comparison result;
the temperature difference detection module is used for detecting and obtaining a temperature difference value between the DPF inlet temperature and the DOC inlet temperature;
the out-of-control state monitoring module is used for judging the out-of-control state according to the working states of the fuel cut-off valve and the fuel metering valve, the pressure comparison result and the temperature difference value and combining a preset state judgment rule to obtain a state judgment result;
the regulation and control instruction issuing unit is used for generating a regulation and control instruction according to the state judgment result;
and the regulation and control execution unit regulates and controls the engine according to the regulation and control instruction.
The beneficial effect that technical scheme that this application provided brought includes:
according to the fuel cut-off valve and the fuel metering valve, the out-of-control state of the DPF active regeneration fuel injection system is judged according to the working state, the pressure comparison result and the temperature difference value, corresponding protection measures are taken, safety guarantee is provided for vehicle running, and the risks of casualties and property loss are reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flowchart illustrating steps of a control method for an active regeneration fuel injection system of a DPF according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart of a control method of a DPF active regeneration fuel injection system according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a control method for a DPF active regeneration fuel injection system according to an embodiment of the present disclosure;
FIG. 4 is a block diagram illustrating a control apparatus of a DPF active regeneration fuel injection system according to a second embodiment of the present disclosure;
the labels in the figure are:
1. a working state detection module; 2. a regenerative oil supply pressure detection module; 3. a temperature difference detection module; 4. an out-of-control state monitoring module; 5. a regulation instruction issue unit; 6. and a regulation and control execution unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The embodiment of the invention provides a control method and a control device for a DPF active regeneration oil injection system, which are used for judging the out-of-control state of the DPF active regeneration oil injection system according to the working state, the pressure comparison result and the temperature difference value of a fuel oil cut-off valve and a fuel oil metering valve, and adopting corresponding protection measures to provide safety guarantee for vehicle running and reduce the risks of casualties and property loss.
In order to achieve the technical effects, the general idea of the application is as follows:
a control method for a DPF active regeneration fuel injection system comprises the following steps:
s1, detecting the working states of the fuel cut-off valve and the fuel metering valve when the engine is not in the DPF active regeneration state;
s2, detecting the pressure of the regenerated oil supply, and comparing the pressure with a preset first pressure threshold and a preset second pressure threshold to obtain a pressure comparison result;
s3, performing out-of-control state judgment according to the working state of the fuel cut-off valve and the fuel metering valve, the pressure comparison result and the temperature difference value between the DPF inlet temperature and the DOC inlet temperature to obtain a state judgment result;
and S4, regulating and controlling the engine according to the state judgment result.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Example one
Referring to fig. 1 to 3, an embodiment of the present invention provides a control method for a DPF active regeneration fuel injection system, including the following steps:
s1, detecting the working states of the fuel cut-off valve and the fuel metering valve when the engine is not in the DPF active regeneration state;
s2, detecting the pressure of the regenerated oil supply, and comparing the pressure with a preset first pressure threshold and a preset second pressure threshold to obtain a pressure comparison result;
s3, performing out-of-control state judgment according to the working state of the fuel cut-off valve and the fuel metering valve, the pressure comparison result and the temperature difference value between the DPF inlet temperature and the DOC inlet temperature to obtain a state judgment result;
and S4, regulating and controlling the engine according to the state judgment result.
According to the working state, the pressure comparison result and the temperature difference value of the fuel cut-off valve and the fuel metering valve, the out-of-control state of the DPF active regeneration fuel injection system is judged, corresponding protection measures are taken, safety guarantee is provided for vehicle running, and risks of casualties and property loss are reduced.
Specifically, the method includes the following steps of detecting the magnitude of the regeneration oil supply pressure, comparing the magnitude of the regeneration oil supply pressure with a preset first pressure threshold and a preset second pressure threshold, and obtaining a pressure comparison result:
s200, detecting to obtain the size of the regeneration oil supply pressure;
s201, when the numerical value of the regenerative oil supply pressure is not larger than a first pressure threshold value and the state maintaining time exceeds a third time threshold value, judging that the regenerative oil supply pressure belongs to a first preset pressure interval;
s202, when the numerical value of the regenerative oil supply pressure is larger than the first pressure threshold and not larger than the second pressure threshold, and the state maintaining time exceeds a fourth time threshold, judging that the regenerative oil supply pressure belongs to a second preset pressure interval.
The concrete operating condition, pressure ratio result and DPF inlet temperature and DOC inlet temperature's difference in temperature according to fuel trip valve and fuel metering valve carry out the out of control state and judge, obtain the state judgement result, it includes:
judging that the DPF active regeneration oil injection system is in a first-stage fault state;
judging that the DPF active regeneration oil injection system is in a second-stage fault state;
and judging that the DPF active regeneration fuel injection system is in a third-stage fault state.
Specifically, when the DPF active regeneration fuel injection system is in a first-stage fault state, the following conditions are specifically included:
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value, the state maintaining time exceeds a preset first calibration time, the fuel cut-off valve and the fuel metering valve are in a driving state, and the regeneration fuel supply pressure belongs to a first preset pressure interval;
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value, the state maintaining time exceeds a preset first calibration time, the fuel cut-off valve is in a driving state, the fuel metering valve is in a non-driving state, and the regeneration fuel supply pressure belongs to a first preset pressure interval.
Specifically, when the DPF active regeneration fuel injection system is in a second-stage fault state, the following conditions are specifically included:
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value, the state maintaining time exceeds a preset first calibration time, the fuel cut-off valve is in a non-driving state, the fuel metering valve is in a driving state, and the regeneration fuel supply pressure belongs to a first preset pressure interval;
the temperature difference value of DPF inlet temperature and DOC inlet temperature is less than a first temperature difference threshold value, the state retention time exceeds a preset first calibration time, the fuel cut-off valve is in a driving state, the fuel metering valve is in a non-driving state, and the regeneration fuel supply pressure belongs to a second preset pressure interval.
Specifically, when the DPF active regeneration fuel injection system is in a third-stage fault state, the following conditions are specifically included:
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value, the state maintaining time exceeds a preset first calibration time, the fuel cut-off valve and the fuel metering valve are in a driving state, and the regeneration fuel supply pressure belongs to a second preset pressure interval;
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value, the state retention time exceeds a preset first calibration time, the fuel cut-off valve is in a non-driving state, the fuel metering valve is in a driving state, and the regeneration fuel supply pressure belongs to a second preset pressure interval;
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value, the state maintaining time exceeds a preset first calibration time, the fuel cut-off valve and the fuel metering valve are in a non-driving state, and the regeneration fuel supply pressure belongs to a second preset pressure interval;
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is not less than a first temperature difference threshold value, the state maintaining time exceeds a first calibration time, and any one of the fuel cut-off valve and the fuel metering valve is in a driving state.
Specifically, the engine regulation and control method specifically comprises the following steps of:
when the DPF active regeneration oil injection system is in a first-stage fault state, carrying out speed-limiting operation on the engine;
when the DPF active regeneration oil injection system is in a second-stage fault state, carrying out speed limit operation and torque limit operation on the engine;
and when the DPF active regeneration oil injection system is in a third-stage fault state, stopping the engine.
Further, before detecting the operating states of the fuel cut valve and the fuel metering valve, i.e., before step S1, the method further includes the steps of:
and identifying the state of the DPF active regeneration activation identifier, if the DPF active regeneration activation identifier is in an activated state, determining that the engine is in the DPF active regeneration state, and if the DPF active regeneration activation identifier is in an inactivated state, determining that the engine is not in the DPF active regeneration state.
Specifically, when detecting the operating condition of the fuel cut-off valve, the method specifically comprises the following steps:
and identifying a driving signal of the fuel cut-off valve, and when the value of the driving signal of the fuel cut-off valve is not less than a first preset threshold value and the state retention time exceeds a first time threshold value, determining that the fuel cut-off valve is in a driving state, otherwise, determining that the fuel cut-off valve is in a non-driving state.
Specifically, when the fuel metering valve is in a working state, the method specifically comprises the following steps:
and identifying a driving signal of the fuel metering valve, and when the value of the driving signal of the fuel metering valve is not less than a second preset threshold value and the state maintaining time exceeds a second time threshold value, determining that the fuel metering valve is in a driving state, otherwise, determining that the fuel metering valve is in a non-driving state.
In addition, the method further comprises a state judgment rule, wherein the state judgment rule comprises a first state judgment rule and a second state judgment rule;
in step S3, a temperature difference between the DPF inlet temperature and the DOC inlet temperature is detected, and a runaway state determination is performed according to the operating state of the fuel cut-off valve, the operating state of the fuel metering valve, a pressure comparison result, and a temperature difference value, in combination with a preset determination rule, and step S3 specifically includes the following steps:
s300, judging an out-of-control state according to the working state of the fuel cut-off valve, the working state of the fuel metering valve, a pressure comparison result and a temperature difference value by combining a first state judgment rule according to the working state of the fuel cut-off valve, the working state of the fuel metering valve, a pressure comparison result and the temperature difference value if the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value and the state retention time exceeds a preset first calibration time;
s301, judging the out-of-control state by combining a second state judgment rule according to the working state of the fuel cut-off valve, the working state of the fuel metering valve, a pressure comparison result and a temperature difference value and according to the working state of the fuel cut-off valve, the temperature difference value between the DPF inlet temperature and the DOC inlet temperature not less than a first temperature difference threshold value and the state keeping time exceeding a first calibration time.
Specifically, the first state determination rule is:
when the fuel cut-off valve and the fuel metering valve are in a driving state and the regeneration fuel supply pressure belongs to a first preset pressure interval, judging that the DPF active regeneration fuel injection system is in a first-stage fault state;
when the fuel cut-off valve is in a driving state, the fuel metering valve is in a non-driving state, and the regeneration fuel supply pressure belongs to a first preset pressure interval, judging that the DPF active regeneration fuel injection system is in a first-stage fault state;
when the fuel cut-off valve is in a non-driving state, the fuel metering valve is in a driving state, and the regeneration fuel supply pressure belongs to a first preset pressure interval, judging that the DPF active regeneration fuel injection system is in a second-stage fault state;
when the fuel cut-off valve and the fuel metering valve are in a driving state and the regeneration fuel supply pressure belongs to a second preset pressure interval, judging that the DPF active regeneration fuel injection system is in a third-stage fault state;
when the fuel cut-off valve is in a driving state, the fuel metering valve is in a non-driving state, and the regeneration fuel supply pressure belongs to a second preset pressure interval, it is judged that the DPF active regeneration fuel injection system is in a second-stage fault state;
when the fuel cut-off valve is in a non-driving state, the fuel metering valve is in a driving state, and the regeneration fuel supply pressure belongs to a second preset pressure interval, it is judged that the DPF active regeneration fuel injection system is in a third-stage fault state;
and when the fuel cut-off valve and the fuel metering valve are in a non-driving state and the regeneration fuel supply pressure belongs to a second preset pressure interval, judging that the DPF active regeneration fuel injection system is in a third-stage fault state.
Specifically, the second state determination rule is:
and when any one of the fuel cut-off valve and the fuel metering valve is in a driving state, judging that the DPF active regeneration fuel injection system is in a third-stage fault state.
Here, a workflow of the embodiment of the present application in implementation is provided, which specifically includes the following steps:
step 1, judging whether the current engine is in a DPF active regeneration state or not according to the DPF active regeneration activation identifier, if the DPF active regeneration activation identifier is activated, keeping a monitoring state, and if the DPF active regeneration activation identifier is not activated, starting to perform a control step.
Step 2, detecting the states of the driving signals corresponding to the fuel cut-off valve and the fuel metering valve respectively, so as to detect the working states of the fuel cut-off valve and the fuel metering valve;
the driving state of the fuel cut-off valve is divided into two states, namely a driving state and a non-driving state, when the driving signal of the fuel cut-off valve is greater than or equal to a set threshold value gamma 1 and the driving state is maintained for at least a calibrated threshold value time T1 (namely a first time threshold value), the fuel cut-off valve is judged to be in the driving state (marked as a state A for the convenience of brief description), otherwise, the fuel cut-off valve is in the non-driving state (marked as a state B);
similarly, for the actuation state of the fuel metering valve, there are two states, an actuated state and a non-actuated state, and when the fuel metering valve actuation signal is greater than or equal to the set threshold γ 2 and remains in this state for at least the calibrated threshold time T2 (i.e., the second time threshold), it is determined that the fuel metering valve is currently in the actuated state (labeled as state C), otherwise, it is in the non-actuated state (labeled as state D).
For convenience of description, 4 combinations of 2 states of the fuel cut valve and the fuel metering valve can be carried out, namely a combination AC (defined as simultaneously satisfying a driving state A of the fuel cut valve and a driving state C of the fuel metering valve), a combination AD (defined as simultaneously satisfying a driving state A of the fuel cut valve and a driving state D of the fuel metering valve), a combination BC (defined as simultaneously satisfying a driving state B of the fuel cut valve and a driving state C of the fuel metering valve) and a combination BD (defined as simultaneously satisfying a driving state B of the fuel cut valve and a driving state D of the fuel metering valve).
And 3, detecting the actual size of the regeneration oil supply pressure p, setting a first pressure threshold p1 and a second pressure threshold p2, dividing the actual regeneration oil supply pressure value p into 3 sections, if p is detected to be more than or equal to 0 and less than or equal to p1, and at least keeping the state for a calibrated threshold time T3 (namely a third time threshold), determining that the actual regeneration oil supply pressure signal is currently in the section (i), and if p is detected to be more than or equal to p1 and less than or equal to p2, and at least keeping the state for a calibrated threshold time T4 (namely a fourth time threshold), determining that the actual regeneration oil supply pressure signal is currently in the section (ii).
Step 4, judging the grades (defined as grades I, II and III) of the uncontrolled state of the DPF active regeneration oil injection system according to the different states in the step 2 and the different intervals in the step 4, namely a first-stage fault state, a second-stage fault state and a third-stage fault state;
if it is detectedThe temperature difference delta T between the DPF inlet temperature and the DOC inlet temperature is less than the set temperature difference threshold delta Tlim(i.e., the first temperature differential threshold) and for at least a calibration time Ts1(first calibration time), the determination is performed according to the first state determination rule, i.e., the following table 1:
TABLE 1
Figure BDA0002701430990000141
Figure BDA0002701430990000151
If the temperature difference delta T between the DPF inlet temperature and the DOC inlet temperature is detected to be not less than the set temperature difference threshold delta TlimAnd continues for at least a calibration time Ts2(second calibration time), the determination is made according to the second state determination rule, i.e., the following table 2:
TABLE 2
Section 1 Interval 2
Combined AC
Combined AD
Combination ofBC
Combined BD -
Step 5, the processing decision module carries out corresponding countermeasure processing according to the stage of the out-of-control state of the DPF active regeneration oil injection system determined in the step 4, outputs a corresponding control instruction and transmits the control instruction to the instruction execution module to enable the instruction execution module to act, so that the vehicle running danger caused by the out-of-control of the DPF active regeneration oil injection system is avoided, and the specific countermeasure processing is described as follows:
when the class of the out-of-control state of the DPF active regeneration oil injection system is I, sending an out-of-control state I fault instruction and a speed limiting instruction, limiting the speed of the engine, displaying the I-class fault of the out-of-control state of the regeneration oil injection system, and reminding a driver of going to a service station for maintenance;
when the class of the out-of-control state of the DPF active regeneration oil injection system is II, sending an out-of-control state II fault instruction and a speed-limiting and torque-limiting instruction, limiting the speed and torque of the engine, displaying the II-class fault of the out-of-control state of the regeneration oil injection system, and reminding a driver to go to a service station for maintenance as soon as possible;
when the class of the uncontrolled state of the DPF active regeneration oil injection system is III, a stop instruction is sent to an instruction actuator module, and the engine is controlled to enter a stop state immediately after a calibration time T5 (a fifth time threshold value) passes.
Example two
Referring to fig. 4, an embodiment of the present invention provides a DPF active regeneration fuel injection system control apparatus, which implements the DPF active regeneration fuel injection system control method in the first embodiment, and the apparatus includes:
the working state detection module 1 is used for detecting the working states of the fuel cut-off valve and the fuel metering valve when the engine is not in the DPF active regeneration state;
the regeneration oil supply pressure detection module 2 is used for detecting the magnitude of regeneration oil supply pressure and comparing the magnitude with a preset first pressure threshold and a preset second pressure threshold to obtain a pressure comparison result;
the temperature difference detection module 3 is used for detecting and obtaining a temperature difference value between the DPF inlet temperature and the DOC inlet temperature;
the out-of-control state monitoring module 4 is used for judging the out-of-control state according to the working states of the fuel cut-off valve and the fuel metering valve, the pressure comparison result and the temperature difference value and combining a preset state judgment rule to obtain a state judgment result;
a regulation instruction issuing unit 5 for generating a regulation instruction according to the state determination result;
and the regulation and control execution unit 6 regulates and controls the engine according to the regulation and control instruction.
According to the working state, the pressure comparison result and the temperature difference value of the fuel cut-off valve and the fuel metering valve, the out-of-control state of the DPF active regeneration fuel injection system is judged, corresponding protection measures are taken, safety guarantee is provided for vehicle running, and risks of casualties and property loss are reduced.
Specifically, the working state detection module 1 is used for acquiring signals required for detecting the failure of the DPF active regeneration fuel injection system, and includes a DPF active regeneration activation identifier, a fuel cut-off valve drive signal, and a fuel metering valve drive signal
The regeneration oil supply pressure detection module 2 is used for detecting regeneration oil supply pressure;
the temperature difference detection module 3 is used for detecting a DOC inlet temperature signal and a DPF inlet temperature signal;
the out-of-control state monitoring module 4 identifies and detects the out-of-control of the DPF active regeneration oil injection system according to the signals obtained by the signal acquisition module, and judges whether the DPF active regeneration oil injection system is in the out-of-control state or not.
And the regulation and control instruction issuing unit 5 is used for carrying out decision processing aiming at the condition that the DPF active regeneration oil injection system is in an out-of-control state, and sending a corresponding regulation and control instruction to the regulation and control execution unit 6.
And the regulation and control execution unit 6 executes a corresponding action instruction according to the instruction requirement of the processing decision, so that the driving safety of the vehicle is protected.
The DPF active regeneration activation identifier, a fuel cut-off valve driving signal and a fuel metering valve driving signal can be directly obtained from the interior of an engine ECU;
the regenerated fuel supply pressure signal is derived from a fuel pressure sensor;
the DOC inlet temperature signal is derived from a DOC inlet temperature sensor;
the DPF inlet temperature signal is derived from a DPF inlet temperature sensor.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present application and are presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A control method for a DPF active regeneration fuel injection system is characterized by comprising the following steps:
when the engine is not in the DPF active regeneration state, detecting the working states of a fuel cut-off valve and a fuel metering valve;
detecting the magnitude of the regeneration oil supply pressure, and comparing the magnitude with a preset first pressure threshold value and a preset second pressure threshold value to obtain a pressure comparison result;
according to the working state of the fuel cut-off valve and the fuel metering valve, the pressure comparison result and the temperature difference value between the DPF inlet temperature and the DOC inlet temperature, performing out-of-control state judgment to obtain a state judgment result;
and regulating and controlling the engine according to the state judgment result.
2. The DPF active regeneration fuel injection system control method of claim 1, wherein the detecting of the regeneration fuel supply pressure and the comparing with the preset first pressure threshold and the second pressure threshold to obtain the pressure comparison result specifically includes the following steps:
detecting to obtain the magnitude of the regeneration oil supply pressure;
when the numerical value of the regenerative oil supply pressure is not larger than a first pressure threshold value and the state maintaining time exceeds a third time threshold value, judging that the regenerative oil supply pressure belongs to a first preset pressure interval;
and when the numerical value of the regenerative oil supply pressure is greater than the first pressure threshold and not greater than the second pressure threshold and the state maintaining time exceeds a fourth time threshold, judging that the regenerative oil supply pressure belongs to a second preset pressure interval.
3. The DPF active regeneration fuel injection system control method of claim 2, wherein performing the runaway state determination according to the operating state of the fuel cut-off valve and the fuel metering valve, the pressure comparison result, and the temperature difference between the DPF inlet temperature and the DOC inlet temperature to obtain a state determination result comprises:
judging that the DPF active regeneration oil injection system is in a first-stage fault state;
judging that the DPF active regeneration fuel injection system is in a second-stage fault state;
and determining that the DPF active regeneration fuel injection system is in a third-stage fault state.
4. The DPF active regeneration fuel injection system control method of claim 3, wherein the DPF active regeneration fuel injection system in the first stage fault state specifically includes the following conditions:
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value, the state maintaining time exceeds a preset first calibration time, the fuel cut-off valve and the fuel metering valve are in a driving state, and the regeneration fuel supply pressure belongs to a first preset pressure interval;
the temperature difference value of DPF inlet temperature and DOC inlet temperature is less than first difference in temperature threshold value to state holding time surpasss the first calibration time of predetermineeing, the fuel trip valve is in the drive condition, the fuel metering valve is in non-drive state, just regeneration fuel feeding pressure size belongs to first predetermined pressure interval.
5. The DPF active regeneration fuel injection system control method of claim 3, wherein the DPF active regeneration fuel injection system in the second stage fault state specifically includes the following conditions:
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value, the state maintaining time exceeds a preset first calibration time, the fuel cut-off valve is in a non-driving state, the fuel metering valve is in a driving state, and the regeneration fuel supply pressure belongs to a first preset pressure interval;
the temperature difference value of DPF inlet temperature and DOC inlet temperature is less than first difference in temperature threshold value to state holding time surpasss the first calibration time of predetermineeing, the fuel trip valve is in the drive condition, the fuel metering valve is in non-drive state, just regeneration fuel feeding pressure size belongs to the second and predetermines the pressure interval.
6. The DPF active regeneration fuel injection system control method of claim 3, wherein the DPF active regeneration fuel injection system in the third stage fault state specifically includes the following conditions:
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value, the state maintaining time exceeds a preset first calibration time, the fuel cut-off valve and the fuel metering valve are in a driving state, and the regeneration fuel supply pressure belongs to a second preset pressure interval;
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value, the state maintaining time exceeds a preset first calibration time, the fuel cut-off valve is in a non-driving state, the fuel metering valve is in a driving state, and the regeneration fuel supply pressure belongs to a second preset pressure interval;
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is smaller than a first temperature difference threshold value, the state maintaining time exceeds a preset first calibration time, the fuel cut-off valve and the fuel metering valve are in a non-driving state, and the regeneration fuel supply pressure belongs to a second preset pressure interval;
the temperature difference value between the DPF inlet temperature and the DOC inlet temperature is not less than a first temperature difference threshold value, the state maintaining time exceeds the first calibration time, and any one of the fuel cut-off valve and the fuel metering valve is in a driving state.
7. The DPF active regeneration fuel injection system control method according to claims 3 to 6, wherein the controlling the engine according to the state determination result includes the steps of:
when the DPF active regeneration oil injection system is in a first-stage fault state, carrying out speed-limiting operation on the engine;
when the DPF active regeneration oil injection system is in a second-stage fault state, carrying out speed limit operation and torque limit operation on the engine;
and when the DPF active regeneration oil injection system is in a third-stage fault state, stopping the engine.
8. The DPF active regeneration fuel injection system control method of claim 1, further comprising, prior to said detecting the operating status of the fuel shut-off valve and fuel metering valve, the steps of:
and identifying the state of a DPF active regeneration activation identifier, if the DPF active regeneration activation identifier is in an activated state, determining that the engine is in a DPF active regeneration state, and if the DPF active regeneration activation identifier is in an inactivated state, determining that the engine is not in the DPF active regeneration state.
9. The DPF active regeneration fuel injection system control method of claim 1, wherein detecting the operating state of the fuel cut-off valve specifically comprises the steps of:
and identifying the driving signal of the fuel cut-off valve, and when the value of the driving signal of the fuel cut-off valve is not less than a first preset threshold value and the state retention time exceeds a first time threshold value, judging that the fuel cut-off valve is in a driving state, otherwise, judging that the fuel cut-off valve is in a non-driving state.
10. A DPF active regeneration fuel injection system control apparatus, comprising:
the working state detection module is used for detecting the working states of the fuel cut-off valve and the fuel metering valve when the engine is not in the DPF active regeneration state;
the regeneration oil supply pressure detection module is used for detecting the magnitude of regeneration oil supply pressure and comparing the magnitude of the regeneration oil supply pressure with a preset first pressure threshold and a preset second pressure threshold to obtain a pressure comparison result;
the temperature difference detection module is used for detecting and obtaining a temperature difference value between the DPF inlet temperature and the DOC inlet temperature;
the out-of-control state monitoring module is used for judging the out-of-control state according to the working states of the fuel cut-off valve and the fuel metering valve, the pressure comparison result and the temperature difference value and combining a preset state judgment rule to obtain a state judgment result;
the regulation and control instruction issuing unit is used for generating a regulation and control instruction according to the state judgment result;
and the regulation and control execution unit regulates and controls the engine according to the regulation and control instruction.
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