CN113090367B - Control method and system for rapidly realizing DPF active regeneration - Google Patents
Control method and system for rapidly realizing DPF active regeneration Download PDFInfo
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- CN113090367B CN113090367B CN202110351234.0A CN202110351234A CN113090367B CN 113090367 B CN113090367 B CN 113090367B CN 202110351234 A CN202110351234 A CN 202110351234A CN 113090367 B CN113090367 B CN 113090367B
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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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- 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
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention discloses a control method and a control system for rapidly realizing DPF active regeneration, which relate to the field of engine control. And operating the engine according to the preset first fuel injection quantity and the first fuel injection time so as to switch the engine from the idle speed to the preset rotating speed. And operating the engine according to the preset second fuel injection quantity and the second fuel injection time so that the DOC inlet temperature is higher than the preset temperature. And calculating the oil injection quantity of the DPF according to the total exhaust quantity and the temperature difference, wherein the total exhaust quantity is equal to the sum of the first oil injection quantity, the second oil injection quantity and the air inflow, and the temperature difference is equal to the difference between the target temperature of the DPF inlet and the DOC inlet temperature. And controlling the HC injection valve to inject oil according to the oil injection quantity of the DPF to regenerate the DPF. The invention provides a control method of active regeneration.
Description
Technical Field
The invention relates to the field of engine control, in particular to a control method and a control system for rapidly realizing DPF active regeneration.
Background
The diesel engine has the advantages of high thermal efficiency, low fuel consumption, good durability and the like, and is widely applied to various industries. The diesel engine brings convenience to people and also brings serious environmental pollution problems. Particulate matter and nitrogen oxides in exhaust gas are the main targets of diesel emission control. To address the historically strict national six diesel emission regulations, diesel particulate trap DPF technology is currently considered the most effective means to address the diesel particulate emission problem. The honeycomb-shaped ceramic carrier structure filters and traps particulate matters in the exhaust gas of the diesel engine through diffusion, deposition and impact mechanisms. In the filtering and trapping process, as the particulates are accumulated in the DPF, the exhaust back pressure of the diesel engine rises to deteriorate the performance of the diesel engine, and it is necessary to periodically remove the particulates in the DPF to restore the DPF to an initial state and regenerate the DPF.
For medium and heavy diesel engines, the DPF is usually regenerated by active regeneration. Active regeneration increases the exhaust temperature by adding additional external energy or intervention to reach the desired oxidation combustion temperature (550-650 ℃) of the particulate matter, removing the particulate matter trapped in the DPF. The carbon loading amount trapped in the DPF is usually adopted to trigger the DPF to actively regenerate, and the carbon loading amount trapped in the DPF cannot be directly obtained and can only be indirectly obtained through an estimation method, so that the carbon loading amount is influenced by various actual running conditions and complex environmental factors in the running process of a vehicle, and the carbon loading amount obtained based on the estimation method sometimes cannot trigger the DPF to regenerate, so that the DPF is blocked. In order to enhance the trigger mechanism of DPF active regeneration and ensure the real-time activation requirement of DPF active regeneration, it is necessary to provide a control system and method for quickly implementing DPF active regeneration.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a control method and a control system for quickly realizing DPF active regeneration, which can quickly realize the DPF active regeneration function and avoid the problem of DPF blockage caused by the fact that a program cannot automatically trigger DPF active regeneration through the estimated carbon loading amount in a DPF.
In order to achieve the above object, in a first aspect, embodiments of the present invention provide a control method for quickly implementing DPF active regeneration
Receiving a DPF active regeneration command;
operating the engine according to a preset first oil injection quantity and a first oil injection moment so as to switch the engine from an idle speed to a preset rotating speed;
operating the engine according to a preset second oil injection quantity and a second oil injection moment so as to enable the DOC inlet temperature to be higher than the preset temperature;
calculating DPF oil injection quantity according to the total exhaust quantity and a temperature difference, wherein the total exhaust quantity is equal to the sum of the first oil injection quantity, the second oil injection quantity and the air inflow, and the temperature difference is equal to the difference between the DPF inlet target temperature and the DOC inlet temperature;
and controlling the HC injection valve to inject oil according to the oil injection quantity of the DPF to regenerate the DPF.
As a preferred embodiment, after receiving the DPF active regeneration command and before operating the engine according to the preset first fuel injection amount and the first fuel injection time, the method includes:
checking whether the state of the whole vehicle meets preset regeneration conditions, and if the detection conditions are not met, prompting the corresponding unsatisfied conditions until all regeneration conditions are met.
As a preferred embodiment, the preset regeneration conditions include:
the water temperature of the engine is within a preset threshold value;
the position of an accelerator pedal is not more than a preset accelerator threshold value;
the vehicle speed signal is not greater than a preset vehicle speed threshold value V0;
prohibiting the regeneration switch from being pressed;
the brake pedal is not stepped on;
the power takeoff switch is not activated;
the clutch is not disengaged;
the gear is in neutral;
the handbrake is pulled.
As a preferred embodiment, the calculating the DPF fuel injection amount according to the total exhaust amount equal to the sum of the first fuel injection amount, the second fuel injection amount, and the intake air amount and the temperature difference equal to the difference between the DPF inlet target temperature and the DOC inlet temperature comprises:
if the first fuel injection quantity Q1, the second fuel injection quantity Q2 and the intake air quantity Qair are set, the total exhaust quantity Qexh thereof is Q1+ Q2+ Q3;
setting a DPF inlet target temperature TDPF and a DOC actual inlet temperature TDOC, and setting a temperature difference delta T as TDPF-TDOC;
the DPF fuel injection amount Qfuel is Cp × Qexh × Δ T/Hfuel,
wherein Cp is the exhaust gas specific constant pressure heat capacity, and Hfuel is the low heating value of the fuel.
As a preferred embodiment, after the DOC inlet temperature is higher than the preset temperature, the method comprises the following steps:
setting a DPF regeneration time limit T;
controlling an HC injection valve to inject oil according to the oil injection quantity of the DPF to regenerate the DPF;
after the DPF regeneration time reaches the DPF regeneration time limit T, the DPF regeneration is ended.
In a preferred embodiment, the preset engine speed, the first fuel injection amount and the first fuel injection time are first instructions;
the second oil injection quantity, the second oil injection time and the air inlet throttling valve control instruction are second instructions;
the DPF oil injection quantity and HC regeneration instruction are the third instruction;
and generating and sending a first instruction and a second instruction in sequence, and calculating and sending a third instruction according to the first instruction, the second instruction and the DOC inlet temperature.
As a preferred embodiment, said receiving a DPF active regeneration command comprises:
the active regeneration button is pressed.
As a preferred embodiment, before the active regeneration button is pressed, the method further includes:
and after the driving mileage of the vehicle reaches a preset threshold value, sending a signal for prompting active regeneration.
In a second aspect, an embodiment of the present invention further provides a control system for quickly implementing active DPF regeneration, including:
the receiving module is used for receiving a DPF active regeneration command;
the switching module is used for operating the engine according to a preset first oil injection quantity and a first oil injection moment so as to switch the engine from an idle speed to a preset rotating speed;
the temperature rising module is used for operating the engine according to a preset second oil injection quantity and a second oil injection moment so as to enable the temperature of the DOC inlet to be higher than the preset temperature;
the calculation module is used for calculating DPF oil injection quantity according to total exhaust quantity and temperature difference, the total exhaust quantity is equal to the sum of the first oil injection quantity, the second oil injection quantity and air inflow, and the temperature difference is equal to the difference between DPF inlet target temperature and DOC inlet temperature;
and the regeneration module is used for controlling the HC injection valve to inject oil according to the oil injection quantity of the DPF to regenerate the DPF.
As a preferred embodiment, the computing module is further configured to:
setting a first fuel injection quantity Q1Second injection quantity Q2And an intake air quantity QairThen, the total amount of exhaust gas Q thereofexh＝Q1+Q2+Q3；
Let DPF inlet target temperature TDPFAnd DOC actual inlet temperature TDOCIf the temperature difference is TDPF-TDOC；
DPF oil injection quantity Qfuel＝Cp×Qexh×△T/Hfuel，
Wherein, CpFor exhaust gas ratio, constant pressure heat capacity, HfuelThe fuel oil has low heat value.
Compared with the prior art, the invention has the advantages that:
the DPF regeneration can be completed step by directly receiving an active regeneration request. The invention firstly adjusts the running state of the engine, so that the engine is in a more stable and efficient state, and the implementation of the subsequent steps is convenient. Furthermore, the temperature of the DOC inlet is improved through oil injection, the temperature of the DOC inlet is guaranteed to be higher than a set temperature threshold value, and therefore when the DPF is cleaned, DPF regeneration can be finally completed through oil injection of the HC injection valve.
Furthermore, the first oil injection quantity, the second oil injection quantity, the first oil injection time and the second oil injection time which are preset in the scheme ensure the smooth implementation of each stage by accurate and efficient quantity; simultaneously, according to first fuel injection quantity, second fuel injection quantity, calculate DPF fuel injection quantity for DPF regeneration can go on with the most reasonable fuel injection quantity, has both saved the fuel, and high efficiency has accomplished DPF regeneration again.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings corresponding to the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of steps of a control method for rapidly implementing DPF active regeneration according to an embodiment of the present invention, which is schematically illustrated in structure/exploded view/front view/left view/right view/top view/bottom view;
FIG. 2 is a schematic structural diagram of an embodiment of a control method for rapidly implementing DPF active regeneration according to the present invention
FIG. 3 is a flowchart illustrating steps of a control method for rapidly implementing DPF active regeneration according to another embodiment of the present invention.
In the figure: 1-crankshaft speed sensor, 2-signal acquisition module, 3-air flow sensor, 4-accelerator pedal sensor, 5-engine water temperature sensor, 6-vehicle speed sensor, 7-signal acquisition module, 8-quick regeneration request module, 9-operation condition identification module, 10-coordination control module, 11-temperature lifting module, 12-driving instruction output module, 13-actuator module, 14-air inlet throttle valve, 15-oil injector, 16-HC injection valve, 17-air-conditioning relay, 18-instrument component, 19-vehicle speed sensor, 20-DOC inlet temperature sensor, 21-DPF inlet temperature sensor, 22-fuel pressure sensor, 23-quick regeneration switch, 24-regeneration-forbidding switch, 25-braking switch, 26-hand braking switch, 27-clutch switch, 28-power-takeoff switch and 29-neutral switch.
Detailed Description
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 system for rapidly realizing DPF active regeneration, which can gradually complete the regeneration of a DPF by receiving an active regeneration instruction and performing three-stage oil injection, and can avoid the problem of DPF blockage caused by the fact that a program cannot automatically trigger the DPF active regeneration through the estimated carbon loading amount in the DPF.
In order to achieve the technical effects, the general idea of the application is as follows:
receiving a DPF active regeneration command;
operating the engine according to a preset first oil injection quantity and a first oil injection moment so as to switch the engine from an idle speed to a preset rotating speed;
operating the engine according to a preset second oil injection quantity and a second oil injection moment so as to enable the DOC inlet temperature to be higher than the preset temperature;
calculating DPF oil injection quantity according to the total exhaust quantity and a temperature difference, wherein the total exhaust quantity is equal to the sum of the first oil injection quantity, the second oil injection quantity and the air inflow, and the temperature difference is equal to the difference between the DPF inlet target temperature and the DOC inlet temperature;
and controlling the HC injection valve to inject oil according to the oil injection quantity of the DPF to regenerate the DPF.
In conclusion, the DPF regeneration is directly performed after the regeneration instruction is received, so that the problem that the DPF is blocked because the process cannot automatically trigger the DPF to actively regenerate through the estimated carbon loading amount in the DPF can be effectively avoided.
Furthermore, the engine state is switched through the first oil injection, the DOC temperature is increased through the second oil injection, the DPF regeneration is completed through the third oil injection, the process is continuous, the efficiency is high, and the oil injection amount and the oil injection time are set and calculated, so that the energy is saved, and the efficiency is high.
In order to better understand the technical solution, the following detailed description is made with reference to specific embodiments.
Referring to fig. 1, an embodiment of the present invention provides a control method for quickly implementing active regeneration of a DPF, which includes:
s1, receive a DPF active regeneration command.
The present case can carry out quick DPF regeneration after receiving the DPF instruction, for the carbon loading capacity passive triggering mode of estimating in the DPF among the traditional technical scheme, the present case has increased the controllability of accelerating personnel, intelligent on-vehicle system to DPF regeneration.
And S2, operating the engine according to the preset first fuel injection quantity and the first fuel injection time so as to switch the engine from the idle speed to the preset rotating speed.
When the engine is in an idling state, the running efficiency is not high, and the engine needs to be switched to a certain rotating speed so that the subsequent steps can be performed more quickly and better.
Specifically, a coordination management module of the whole vehicle inquires the calibrated fuel injection quantity Q according to the set engine rotating speed1And injection time theta1Command Q of fuel injection quantity1And injection timing command theta1Sent to a driving instruction output module to control the oil injector to inject oil at a specified oil injection time theta1Injecting quantity Q on command1And injecting fuel, and controlling the engine to switch from the current idle speed state to the set rotating speed state.
And S3, operating the engine according to the preset second fuel injection quantity and the second fuel injection time so that the DOC inlet temperature is higher than the preset temperature.
After switching the engine state, the DOC inlet temperature is raised in preparation for DPF regeneration.
Specifically, a coordination management module of the whole vehicle inquires calibrated air inlet throttle valve control instruction beta and oil injection quantity instruction Q based on the current engine speed and the set DOC inlet target temperature of 300 DEG C2And injection timing command theta2The control instruction beta and the fuel injection quantity instruction Q of the air inlet throttle valve are calculated2And injection timing command theta2The control command is sent to a driving command output module to control the air inlet throttle valve and the oil injector to respectively control the command beta of the air inlet throttle valve and the oil injection time theta at the specified air inlet throttle valve and the specified oil injection time theta2Injecting quantity Q on command2And injecting fuel, and controlling the actual temperature of the DOC inlet to be higher than a set temperature threshold value of 280 ℃.
And S4, calculating the DPF oil injection quantity according to the total exhaust quantity and the temperature difference, wherein the total exhaust quantity is equal to the sum of the first oil injection quantity, the second oil injection quantity and the air inflow, and the temperature difference is equal to the difference between the DPF inlet target temperature and the DOC inlet temperature.
After the engine state is switched by the first-time oil injection and the DOC inlet temperature is increased by the second-time oil injection, the total exhaust amount can be calculated, and the oil injection amount required by DPF cleaning can be further calculated through the total exhaust amount.
For example, the coordination management module of the whole vehicle sets the target temperature according to the DPF inlet600 ℃ and the current actual DOC inlet temperature TDOCCalculating the temperature difference DeltaT, i.e. DeltaT being 600-TDOC；
The coordination management module of the whole vehicle obtains the air intake flow Q according to the signal acquisition moduleairAnd the fuel injection quantity Q obtained by the DOC inlet actual temperature control program1And Q2Obtaining the total exhaust gas quantity QexhI.e. Qexh＝Qair+Q1+Q2；
The coordination management module of the whole vehicle is used for coordinating and managing the temperature difference delta T and the exhaust gas medium quantity QexhCalculating the fuel injection quantity Qfuel, namely Q, required for increasing the DPF inlet temperaturefuel＝cp×Qexh×ΔT/Hfuel(ii) a In the formula, cpThe constant pressure heat capacity for the exhaust gas ratio is approximately constant, approximately 1.004kJ/(kg & lt K); hfuelThe fuel oil has low heat value of 42900 kJ/kg.
And S5, controlling the HC injection valve to inject oil according to the oil injection quantity of the DPF to regenerate the DPF.
After the calculation of the third injection is completed, the injection is performed by the HC injection valve.
Preferably, after the DOC inlet temperature is higher than the preset temperature, the method includes:
setting a DPF regeneration time limit T;
controlling an HC injection valve to inject oil according to the oil injection quantity of the DPF to regenerate the DPF;
after the DPF regeneration time reaches the DPF regeneration time limit T, the DPF regeneration is ended.
For example, when the system executes the actual temperature control program of the DPF inlet, the coordination management module starts to time, and when the time of the time is greater than the set time threshold value for minutes, the DPF parking regeneration function is completed quickly, and the engine speed is recovered to the initial idling state.
The present invention also provides a preferred embodiment on the basis of the above-mentioned embodiment, which includes: after receiving the DPF active regeneration command, before operating the engine according to a preset first fuel injection quantity and a first fuel injection time, the method comprises the following steps:
checking whether the state of the whole vehicle meets preset regeneration conditions, and if the detection conditions are not met, prompting the corresponding unsatisfied conditions until all regeneration conditions are met.
Further, the preset regeneration conditions include:
the water temperature of the engine is within a preset threshold value;
the position of an accelerator pedal is not more than a preset accelerator threshold value;
the vehicle speed signal is not greater than a preset vehicle speed threshold value V0;
prohibiting the regeneration switch from not being pressed;
the brake pedal is not stepped on;
the power takeoff switch is not activated;
the clutch is not disengaged;
the gear is in neutral;
the handbrake is pulled.
Based on the same inventive concept, the invention also provides an embodiment of a control system for rapidly realizing DPF active regeneration, which comprises
The receiving module is used for receiving a DPF active regeneration command;
the switching module is used for operating the engine according to a preset first oil injection quantity and a first oil injection moment so as to switch the engine from an idle speed to a preset rotating speed;
the temperature rising module is used for operating the engine according to a preset second oil injection quantity and a second oil injection moment so as to enable the temperature of the DOC inlet to be higher than the preset temperature;
the calculation module is used for calculating DPF oil injection quantity according to total exhaust quantity and temperature difference, the total exhaust quantity is equal to the sum of the first oil injection quantity, the second oil injection quantity and air inflow, and the temperature difference is equal to the difference between the DPF inlet target temperature and the DOC inlet temperature;
and the regeneration module is used for controlling the HC injection valve to inject oil according to the oil injection quantity of the DPF to regenerate the DPF.
Preferably, the calculation module is further configured to:
setting a first fuel injection quantity Q1Second injection quantity Q2And an intake air quantity QairThen its total exhaust gas quantity Qexh＝Q1+Q2+Q3；
Setting DPF inlet target temperatureDegree TDPFAnd DOC actual inlet temperature TDOCIf the temperature difference is TDPF-TDOC；
DPF oil injection quantity Qfuel＝cp×Qexh×△T/Hfuel，
Wherein, cpFor exhaust gas ratio, constant pressure heat capacity, HfuelThe fuel oil has low heat value.
Various modifications and specific examples in the foregoing method embodiments are also applicable to the system of the present embodiment, and the detailed description of the method is clear to those skilled in the art, so that the detailed description is omitted here for the sake of brevity.
Specifically, as shown in fig. 2, the entire vehicle is provided with:
the system comprises a sensor module 2, a signal acquisition module 7, a quick regeneration request module 8, an operating condition identification module 9, a coordination management module 10, a temperature raising module 11, a driving instruction output module 12 and an actuator module 13.
The sensor module 2 comprises a crankshaft rotation speed sensor 1, a camshaft rotation speed sensor 3, an air flow sensor 4, an accelerator pedal sensor 5, an engine water temperature sensor 6, a vehicle speed sensor 19, a DOC inlet temperature sensor 20, a DPF inlet temperature sensor 21, a fuel pressure sensor 22, a quick regeneration switch 23, a regeneration prohibition switch 24, a brake switch 25, a hand brake switch 26, a clutch switch 27, a power takeoff switch 28 and a neutral gear switch 29;
the signal acquisition module 7 is used for acquiring an engine rotating speed signal, an engine oil injection time, an intake air flow signal, an accelerator pedal position signal, an engine water temperature signal, a vehicle speed signal, a DOC inlet temperature signal, a DPF inlet temperature signal, a fuel pressure signal, a quick regeneration signal, a regeneration prohibition signal, a brake pedal signal, a hand brake signal, a clutch signal, a power takeoff signal and a neutral gear signal;
the quick regeneration request module 8 is used for identifying whether a DPF quick regeneration request signal is activated or not and transmitting an activated quick DPF regeneration request instruction to the operation condition identification module 9; when the driving mileage of the vehicle is greater than the calibratable mileage threshold value of 1000 kilometers, the control instrument assembly displays a prompt of 'request for quick regeneration' and reminds a driver to trigger a quick regeneration switch signal; when the quick regeneration switch is pressed, the DPF quick regeneration request signal is activated; the fast DPF regeneration request signal is derived from the fast regeneration switch 23, or the fast regeneration switch signal is sent to the fast regeneration request module 8 by the vehicle controller VCU through the vehicle-mounted lan.
The running condition recognition module 9 is used for detecting whether the precondition of the rapid DPF active regeneration is met, if not, waiting for the running condition to be met, and sending a factor causing the precondition to be not met to the instrument assembly; if the precondition is satisfied, sending a rapid DPF active regeneration activation instruction to the coordination management module 10;
the coordination management module 10 is used for managing the DOC inlet actual temperature and the DPF inlet actual temperature to reach the temperature actually required in the DPF parking regeneration process;
the temperature raising module 11 is used for raising the DOC inlet actual temperature and the DPF inlet actual temperature, so as to ensure that the DOC inlet actual temperature is kept above a set temperature threshold value and the DPF inlet actual temperature is kept at a set target temperature in the DPF parking regeneration process;
the driving instruction output module 12 is used for realizing a control instruction output function of the actuator module 13;
the actuator module 13 comprises an air inlet throttle valve 14, an oil injector 15, an HC injection valve 16, an air-conditioning relay 17 and an instrument assembly 18, and executes corresponding control instructions to complete corresponding actions.
As shown in fig. 3, an embodiment of the present invention further provides a DPF regeneration step based on the foregoing, which specifically includes:
first, the presence of a fast DPF active regeneration request signal in the detection system can be determined by detecting the fast regeneration switch 23 signal. If not, the system is continuously in a detection state; if so, a fast DPF active regeneration request command is sent to the operating condition identification module 9.
Then the operation condition recognition module 9 starts to recognize and confirm the precondition of the rapid DPF active regeneration, and if the following conditions are simultaneously met, the rapid DPF active regeneration activation instruction is sent to the coordination management module 10;
the water temperature of an engine is 70 ℃ higher than a set water temperature threshold, and is 105 ℃ lower than or equal to the set water temperature threshold;
the position of an accelerator pedal is not more than 5% of a set accelerator threshold value;
thirdly, the vehicle speed signal is not more than a set vehicle speed threshold value of 0.5 km/h;
fourthly, forbidding the regeneration switch not to be pressed;
the brake pedal is not stepped down;
sixthly, the power takeoff switch is not activated;
the clutch is not disengaged;
eighthly, placing the gears in neutral;
ninthly, pulling the hand brake;
if any one of the conditions is not met, a factor causing the unsatisfied precondition of the rapid DPF active regeneration is sent out, and the running condition is waited to be met.
Thereafter, the coordination management module 10 detects that the fast DPF active regeneration identifier is activated, and starts to gradually start the DOC inlet actual temperature and DPF inlet actual temperature control procedure. Preferentially executing a DOC inlet actual temperature control program, and entering the DPF inlet actual temperature control program until the DOC inlet actual temperature is more than or equal to a set temperature threshold value of 280 ℃; and in the process of executing the DOC inlet actual temperature control program and the DPF inlet actual temperature control program, immediately exiting the corresponding control program once the rapid DPF active regeneration activation identifier is detected to be in an inactive state.
The present invention further provides a preferred embodiment based on the above embodiment, wherein the receiving a DPF active regeneration command comprises:
the active regeneration button is pressed.
Before the active regeneration button is pressed, the method further comprises the following steps:
and after the driving mileage of the vehicle reaches a preset threshold value, sending a signal for prompting active regeneration.
Generally speaking, the control method and system for rapidly realizing the DPF active regeneration provided by the embodiment of the invention can rapidly realize the DPF active regeneration function through three times of oil injection compared with the traditional technology, and avoid the problem of DPF blockage caused by the fact that the DPF active regeneration cannot be automatically triggered by a program through the carbon loading amount estimated in the DPF.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A control method for rapidly realizing DPF active regeneration is characterized by comprising the following steps:
receiving a DPF active regeneration command;
operating the engine according to a preset first oil injection quantity and a first oil injection moment so as to switch the engine from an idle speed to a preset rotating speed;
operating the engine according to a preset second oil injection quantity and a second oil injection moment so as to enable the DOC inlet temperature to be higher than the preset temperature;
calculating DPF oil injection quantity according to the total exhaust quantity and a temperature difference, wherein the total exhaust quantity is equal to the sum of the first oil injection quantity, the second oil injection quantity and the air inflow, and the temperature difference is equal to the difference between the DPF inlet target temperature and the DOC inlet temperature;
and controlling the HC injection valve to inject oil according to the oil injection quantity of the DPF to regenerate the DPF.
2. The control method for rapidly implementing the DPF active regeneration according to claim 1, wherein after receiving the DPF active regeneration command and before operating the engine according to the preset first fuel injection amount and the first fuel injection time, the method comprises:
checking whether the state of the whole vehicle meets preset regeneration conditions, and if the detection conditions are not met, prompting the corresponding unsatisfied conditions until all regeneration conditions are met.
3. A control method for rapidly implementing DPF active regeneration as set forth in claim 2, wherein said preset regeneration conditions include:
the water temperature of the engine is within a preset threshold value;
the position of an accelerator pedal is not more than a preset accelerator threshold value;
the vehicle speed signal is not greater than a preset vehicle speed threshold value V0;
prohibiting the regeneration switch from not being pressed;
the brake pedal is not stepped on;
the power takeoff switch is not activated;
the clutch is not disengaged;
the gear is in neutral;
the handbrake is pulled.
4. A control method for rapidly implementing DPF active regeneration according to claim 1, wherein said calculating DPF fuel injection amount according to a total exhaust amount equal to a sum of the first fuel injection amount, the second fuel injection amount and an intake air amount and a temperature difference equal to a difference between a DPF inlet target temperature and DOC inlet temperature comprises:
setting a first fuel injection quantity Q1Second injection quantity Q2And an intake air quantity QairThen, the total amount of exhaust gas Q thereofexh＝Q1+Q2+Q3；
Let DPF inlet target temperature TDPFAnd DOC actual inlet temperature TDOCIf the temperature difference is TDPF-TDOC；
DPF oil injection quantity Qfuel＝Cp×Qexh×△T/Hfuel，
Wherein, CpFor exhaust gas ratio, constant pressure heat capacity, HfuelThe fuel oil has low heat value.
5. A control method for rapidly implementing DPF active regeneration as set forth in claim 1, wherein said DOC inlet temperature is higher than a preset temperature, comprising:
setting a DPF regeneration time limit T;
controlling an HC injection valve to inject oil according to the oil injection quantity of the DPF to regenerate the DPF;
after the DPF regeneration time reaches the DPF regeneration time limit T, the DPF regeneration is ended.
6. A control method for rapidly implementing DPF active regeneration as set forth in claim 1, wherein said receiving a DPF active regeneration command comprises:
the active regeneration button is pressed.
7. A control method for rapidly effecting the active regeneration of a DPF as set forth in claim 6, wherein before the active regeneration button is pressed, further comprising:
and after the driving mileage of the vehicle reaches a preset threshold value, sending a signal for prompting active regeneration.
8. A control system for rapidly effecting active regeneration of a DPF, comprising:
the receiving module is used for receiving a DPF active regeneration command;
the switching module is used for operating the engine according to a preset first oil injection quantity and a first oil injection moment so as to switch the engine from an idle speed to a preset rotating speed;
the temperature rising module is used for operating the engine according to a preset second oil injection quantity and a second oil injection moment so as to enable the temperature of the DOC inlet to be higher than the preset temperature;
the calculation module is used for calculating DPF oil injection quantity according to total exhaust quantity and temperature difference, the total exhaust quantity is equal to the sum of the first oil injection quantity, the second oil injection quantity and air inflow, and the temperature difference is equal to the difference between the DPF inlet target temperature and the DOC inlet temperature;
and the regeneration module is used for controlling the HC injection valve to inject oil according to the oil injection quantity of the DPF to regenerate the DPF.
9. A control system for rapidly implementing active regeneration of a DPF as defined in claim 8, wherein said calculation module is further configured to:
setting a first fuel injection quantity Q1Second injection quantity Q2And an intake air quantity QairThen, the total amount of exhaust gas Q thereofexh＝Q1+Q2+Q3；
Let DPF inlet target temperature TDPFAnd DOC actual inlet temperature TDOCIf the temperature difference is TDPF-TDOC；
DPF oil injection quantity Qfuel＝cp×Qexh×△T/Hfuel，
Wherein, cpFor exhaust gas ratio, constant pressure heat capacity, HfuelThe fuel oil has low heat value.
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| CN114033537B (en) * | 2022-01-10 | 2022-03-15 | 潍柴动力股份有限公司 | Regeneration control method and device of double DPF and engine |
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