CN112746907B - GPF city working condition active regeneration grading control method and system - Google Patents

GPF city working condition active regeneration grading control method and system Download PDF

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Publication number
CN112746907B
CN112746907B CN202010778111.0A CN202010778111A CN112746907B CN 112746907 B CN112746907 B CN 112746907B CN 202010778111 A CN202010778111 A CN 202010778111A CN 112746907 B CN112746907 B CN 112746907B
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gpf
temperature
engine
carbon loading
active regeneration
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CN112746907A (en
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张顺
彭浩
王冬
程晓军
谢程
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Dongfeng Motor Corp
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Dongfeng Motor Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
    • F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
    • F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P5/00—Advancing or retarding ignition; Control therefor
    • F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
    • F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
    • F02P5/15—Digital data processing
    • F02P5/1502—Digital data processing using one central computing unit
    • F02P5/1504—Digital data processing using one central computing unit with particular means during a transient phase, e.g. acceleration, deceleration, gear change
    • 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
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1606—Particle filter loading or soot amount
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0406—Intake manifold pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0812—Particle filter loading
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
    • F02D2200/501—Vehicle speed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention discloses a GPF city working condition active regeneration grading control method and a system, which relate to the technical field of automobile control, and the method comprises the following steps of S1: judging whether a first condition is met or not based on a carbon capacity signal of the GPF and the running time of the engine, if so, turning to S3, and if not, turning to S2; s2: GPF enters a passive regeneration mode; s3: judging whether the engine is in a low-temperature city operation condition, if not, turning to S4, and if so, turning to S5; s4: GPF enters a normal active regeneration mode; s5: and the GPF enters an urban working condition active regeneration mode, then whether a second condition is met is judged along with the active regeneration of the GPF, if not, the GPF continues to maintain the urban working condition active regeneration mode, and if so, the S4 is carried out. The method can effectively reduce the blocking risk of GPF under low-temperature urban working conditions, and effectively regenerate the GPF while considering both the dynamic property and the economical efficiency of the vehicle.

Description

GPF city working condition active regeneration grading control method and system
Technical Field
The invention relates to the technical field of automobile control, in particular to a GPF (general purpose filter) urban working condition active regeneration grading control method and system.
Background
Based on the promulgation of relevant emission regulations of automobiles, how to achieve the regulation and target of Particulate matters of Gasoline engines, particularly supercharged direct injection Gasoline engines, becomes a difficult point, and in such a situation, GPF (Gasoline Particulate Filter) is taken as an effective and direct external purifying device, and gradually becomes the standard of automobiles as the Particulate matters of Gasoline engines can be effectively removed.
When the vehicle is in winter low temperature city circulation operating mode, the engine speed is low, operating time is short, it is difficult to get into initiative regeneration, only rely on passive regeneration and can't consume the carbon loading capacity of particle trap completely, the car is long-time to be gone on winter urban road, easily leads to gasoline engine particle trap to block up, influences the engine performance, serious even damage engine, consequently, how to control GPF's regeneration becomes the current problem that needs to solve urgently.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a GPF (general purpose factor) urban working condition active regeneration grading control method and system, which can effectively reduce the blocking risk of GPF under a low-temperature urban working condition, effectively regenerate and simultaneously give consideration to the dynamic property and the economical efficiency of a vehicle.
In order to achieve the above purpose, the invention provides a GPF city working condition active regeneration grading control method, which comprises the following steps:
s1: judging whether a first condition is met or not based on a carbon load signal of the GPF and the operation time of the engine, wherein the first condition is that the carbon load of the GPF is greater than a first carbon load threshold value, the operation time of the engine is greater than a first preset time, if so, turning to S3, and if not, turning to S2;
s2: GPF enters a passive regeneration mode;
s3: judging whether the engine is in a low-temperature city operation condition, if not, turning to S4, and if so, turning to S5;
s4: GPF enters a normal active regeneration mode;
s5: and the GPF enters an urban working condition active regeneration mode, then whether a second condition is met is judged along with the active regeneration of the GPF, if not, the GPF continues to maintain the urban working condition active regeneration mode, if so, the operation goes to S4, and the second condition is that the engine exits the low-temperature urban operation working condition.
On the basis of the technical scheme, in the normal active regeneration mode and the urban working condition active regeneration mode, the rotating speed of the engine is increased, the ignition advance angle is delayed, the target air-fuel ratio of the engine is increased, the target rotating speed of the engine, the target ignition advance angle and the target air-fuel ratio are adjusted along with the increase of the carbon carrying capacity of GPF, the regeneration strength is enhanced step by step, and the regeneration strength in the urban working condition active regeneration mode is greater than that in the normal active regeneration mode.
On the basis of the technical scheme, when the engine is in a low-temperature city operation condition:
if the carbon loading of the GPF is in the first carbon loading range, the GPF enters a passive regeneration mode, and meanwhile, the target air-fuel ratio A is increased along with the increase of the regeneration time of the GPF and the increase of the inlet temperature of the GPFx,ySatisfies A1,1＝A1,2＝A1,3Target ignition efficiency Bx,ySatisfies B1,1＝B1,2＝B1,3Target Engine speed Cx,ySatisfies C1,1＝C1,2＝C1,3；
If the carbon loading of the GPF is in the second carbon loading range, the GPF enters an urban working condition active regeneration mode, and A is carried out along with the increase of the GPF regeneration time and the increase of the GPF inlet temperature2,1＜A2,2＜A2,3，B2,1＜B2,2＜B2,3＝1，C2,1＞C2,2＞C2,3；
If the carbon loading of the GPF is in the third carbon loading range, the GPF enters an urban working condition active regeneration mode, and A is carried out along with the increase of the GPF regeneration time and the increase of the GPF inlet temperature3,1＝A3,2＝A3,3，B3,1＜B3,2＜B3,3＝1，C3,1＞C3,2＞C3,3And A is3,1＞A2,1＞A1,1， B3,1＜B2,1＜B1,1，C3,1＞C2,1＞C1,1，A3,2＞A2,2＞A1,2，B3,2＜B2,2＜B1,2， C3,2＞C2,2＞C1,2，A3,3＞A2,3＞A1,3，B3,3＝B2,3＝B1,3，C3,3＞C2,3＞C1,3；
Wherein A isx,yIndicates the target air-fuel ratio in the x-th carbon loading range and the y-th temperature range, Bx,yIndicates the target ignition efficiency, C, at the x-th carbon loading range, y-th temperature rangex,yThe target engine speed in the x-th carbon loading range and the y-th temperature range is shown, wherein x is 12,3, respectively indicate a first carbon loading range, a second carbon loading range, and a third carbon loading range, y is 1,2,3, respectively indicate a first temperature range, a second temperature range, and a third temperature range, the first carbon loading range is less than a first carbon loading threshold, the second carbon loading range is greater than or equal to the first carbon loading threshold and is less than a second carbon loading threshold, the third carbon loading range is greater than or equal to the second carbon loading threshold, the first temperature range is less than a first preset temperature, the second temperature range is greater than or equal to a first preset temperature and is less than a second preset temperature, and the third temperature range is greater than or equal to the second preset temperature.
On the basis of the technical scheme, when the engine is not in the low-temperature city operation working condition:
if the carbon loading of the GPF is in the first carbon loading range, the GPF enters a passive regeneration mode, and simultaneously, A increases along with the increase of the regeneration time of the GPF and the increase of the inlet temperature of the GPF1,1＝A1,2＝A1,3，B1,1＝B1,2＝B1,3，C1,1＝C1,2＝C1,3And A is1,1、A1,2、A1,3、B1,1、 B1,2、B1,3、C1,1、C1,2、C1,3Equal to A under low-temperature city operation condition1,1、A1,2、A1,3、 B1,1、B1,2、B1,3、C1,1、C1,2、C1,3；
If the carbon loading of the GPF is in the second carbon loading range, the GPF enters a normal active regeneration mode, and A increases with the increase of the GPF regeneration time and the increase of the GPF inlet temperature2,1＜A2,2＜A2,3，B2,1＜B2,2＜B2,3＝1，C2,1＞C2,2＞C2,3And A is2,1、A2,2、 A2,3、C2,1、C2,2、C2,3Less than A under low-temperature city operation condition2,1、A2,2、A2,3、C2,1、C2,2、C2,3，B2,1、B2,2、B2,3Equal to B under low-temperature urban operation condition2,1、 B2,2、B2,3；
If the carbon loading of the GPF is in the third carbon loading range, the GPF enters a normal active regeneration mode, and A increases with the increase of the GPF regeneration time and the increase of the GPF inlet temperature3,1＝A3,2＝A3,3，B3,1＜B3,2＜B3,3＝1，C3,1＞C3,2＞C3,3And A is3,1、A3,2、A3,3、 C3,1、C3,2、C3,3Less than A under low-temperature city operation condition3,1、A3,2、A3,3、C3,1、 C3,2、C3,3，B3,1、B3,2、B3,3Equal to B under low-temperature urban operation condition3,1、B3,2、 B3,3And A is3,1＞A2,1＞A1,1，B3,1＜B2,1＜B1,1，C3,1＞C2,1＞C1,1， A3,2＞A2,2＞A1,2，B3,2＜B2,2＜B1,2，C3,2＞C2,2＞C1,2，A3,3＞A2,3＞A1,3， B3,3＝B2,3＝B1,3，C3,3＞C2,3＞C1,3。
On the basis of the technical proposal, the device comprises a shell,
the first carbon loading threshold is 35% of the maximum carbon loading of the GPF;
the second carbon loading threshold is 70% of the GPF maximum carbon loading.
On the basis of the technical scheme, the judgment of whether the engine is in the low-temperature city operation condition specifically comprises the following steps: and judging whether the engine is in the urban low-temperature operation working condition or not based on the vehicle speed, the engine rotating speed, the GPF inlet temperature, the engine coolant temperature, the pressure of the intake manifold and the ambient temperature.
On the basis of the technical scheme, when the vehicle speed is smaller than the vehicle speed limit value, the engine speed is smaller than the engine speed limit value, the GPF inlet temperature is smaller than the temperature limit value, the engine coolant temperature is smaller than the coolant temperature limit value, the pressure of the intake manifold is smaller than the pressure limit value, and the environment temperature is smaller than the environment temperature limit value, the engine is judged to be in the urban low-temperature operation working condition.
On the basis of the technical scheme, the judgment condition that the engine exits the low-temperature city operation condition is as follows: when the vehicle speed is greater than the vehicle speed limit value, the engine speed is greater than the engine speed limit value, the GPF inlet temperature is greater than the temperature limit value, the pressure of the intake manifold is greater than the pressure limit value, one of the conditions is met, and the duration of the continuous satisfaction of the current condition is greater than the set duration.
The invention provides a GPF city working condition active regeneration grading control system, which comprises:
the urban working condition identification module is used for judging whether the engine is in a low-temperature urban operation working condition or not according to a signal of the vehicle sensor;
the active regeneration control module is used for controlling the GPF to enter a normal active regeneration mode when the carbon loading of the GPF is larger than a first carbon loading threshold, the running time of the engine is larger than a first preset time and the engine is not in a low-temperature city running working condition based on the judgment of the city working condition identification module; when the carbon capacity of the GPF is larger than a first carbon capacity threshold, the running time of the engine is larger than a first preset time, and the engine is in a low-temperature city running working condition, the GPF is controlled to enter an city working condition active regeneration mode, then whether the engine exits the low-temperature city running working condition is judged along with the active regeneration of the GPF, if not, the GPF continues to maintain the city working condition active regeneration mode, and if so, the GPF enters a normal active regeneration mode.
On the basis of the technical scheme, the signals comprise a vehicle speed signal, an engine rotating speed signal, a GPF inlet temperature signal, an engine coolant temperature signal, an intake manifold pressure signal and an environment temperature signal.
Compared with the prior art, the invention has the advantages that: when the vehicle is in the low temperature city operating mode, implement the regeneration intensity of higher grade than ordinary regeneration operating mode, and along with the rising of GPF carbon loading capacity, shorten the time of admitting into regeneration step by step, improve the regeneration intensity step by step to reduce GPF's under the low temperature city operating mode jam risk, compromise the dynamic nature and the economic nature of vehicle when effectively regenerating.
Drawings
FIG. 1 is a flow chart of an active regeneration grading control method for GPF city operating conditions according to an embodiment of the present invention;
FIG. 2 is a graph of engine active regeneration operating time;
FIG. 3 is a schematic diagram of active regeneration control under low-temperature urban operating conditions;
fig. 4 is a schematic structural diagram of a GPF city operating condition active regeneration hierarchical control system according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a GPF city working condition active regeneration grading control method, which implements higher grade regeneration strength than common regeneration working conditions when a vehicle is in a low-temperature city running working condition, gradually shortens the time allowed to enter regeneration, and improves the regeneration strength, thereby reducing the blocking risk of GPF under the low-temperature city working condition. The embodiment of the invention correspondingly provides a GPF city working condition active regeneration grading control system.
The present invention will be described in further detail with reference to the accompanying drawings and examples. 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, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Referring to fig. 1, an embodiment of the invention provides a GPF city operating condition active regeneration hierarchical control method, which includes the following steps:
s1: and judging whether a first condition is met or not based on the carbon capacity signal of the GPF and the running time of the engine, wherein the first condition is that the carbon capacity of the GPF is greater than a first carbon capacity threshold value, and the running time of the engine is greater than a first preset time, if so, turning to S3, and if not, turning to S2. The first preset duration is influenced by the temperature of engine coolant and the carbon loading of GPF, the rotational speed stability of a heat engine of the engine is better than that of the engine at a lower temperature, the lower the temperature of the engine coolant is, the longer the engine needs to run when the engine reaches a heat engine state, and the earlier the engine enters the active regeneration, the more adverse the combustion stability of the engine is, so the lower the temperature of the coolant is, the longer the engine runs before the GPF enters the active regeneration, and the larger the first preset duration is. With the increase of the carbon load of the GPF, the longer the active regeneration time of the GPF is, the consumption of the carbon is facilitated, so with the increase of the carbon load of the GPF, the required running time of the engine is gradually shortened, and a long running map is shown in FIG. 2.
S2: GPF enters a passive regeneration mode;
s3: judging whether the engine is in a low-temperature city operation condition, if not, turning to S4, and if so, turning to S5;
in the embodiment of the invention, whether the engine is in the low-temperature city operation condition is judged, and the concrete steps are as follows: and judging whether the engine is in the urban low-temperature operation working condition or not based on the vehicle speed, the engine rotating speed, the GPF inlet temperature, the engine coolant temperature, the pressure of the intake manifold and the ambient temperature.
When the vehicle speed is less than the vehicle speed limit value V0The engine speed is less than the engine speed limit value N0GPF inlet temperature less than temperature limit T0The temperature of the engine coolant is less than the coolant temperature limit value T1Intake manifold pressure less than pressure limit P0And the ambient temperature is less than the ambient temperature limit value T2And when the conditions are met, judging that the engine is in the urban low-temperature operation working condition. Specifically, a vehicle speed limit value V0Can be set to 35km/h, engine speed limit N0Can be set to 1400km/h, and the temperature limit value range of the GPF inlet can be more than 350 ℃ < T0≤ 400℃，T0The temperature limit value of the GPF inlet is expressed, and the value range of the temperature limit value of the cooling liquid can be T being more than or equal to minus 45 DEG C1≤60℃，T1The value range of the pressure limit of the intake manifold can be 35 KPa-P0≤60KPa，P0The pressure limit value of the air inlet manifold is shown, and the value range of the environmental temperature limit value can be T being more than or equal to minus 45 DEG C2≤-10℃，T2Representing the ambient temperature limit. The above conditions are limitations, and actually are digital definitions of urban low-temperature operation conditions, in popular terms, the urban low-temperature operation conditions generally refer to that after a driver starts an engine, the engine is operated at a low rotating speed, a low load and a low vehicle speed, and at the moment, the GPF temperature is low, and the regeneration is difficult.
S4: GPF enters a normal active regeneration mode;
s5: and the GPF enters an urban working condition active regeneration mode, then whether a second condition is met is judged along with the active regeneration of the GPF, if not, the GPF continues to maintain the urban working condition active regeneration mode, if so, the operation goes to S4, and the second condition is that the engine exits the low-temperature urban operation working condition.
In the embodiment of the invention, the judgment condition for the engine to exit from the low-temperature city running working condition is as follows: when the vehicle speed is greater than the vehicle speed limit value V0The engine speed is greater than the engine speed limit value N0GPF inlet temperature greater than temperature limit T0Intake manifold pressure greater than pressure limit P0And one of the above conditions is satisfied, and the duration of the continuous satisfaction of the current condition is longer than the set duration. For example, when the vehicle speed is greater than the vehicle speed limit V0And the vehicle speed is greater than the vehicle speed limit value V0If the duration of the engine is longer than the set duration, the engine is judged to exit the low-temperature city operation condition. The set duration may range from 10s to 20 s.
In the embodiment of the invention, under a normal active regeneration mode and an urban working condition active regeneration mode, the rotating speed of an engine is increased, the ignition advance angle is delayed, the target air-fuel ratio of the engine is increased, the rotating speed of the target engine, the target ignition advance angle and the target air-fuel ratio are adjusted along with the increase of the carbon capacity of GPF, the regeneration strength is enhanced step by step, and the regeneration strength under the urban working condition active regeneration mode is greater than that under the normal active regeneration mode. Control of the active regeneration mode under urban conditions is illustrated with reference to FIG. 3.
Regeneration control is mainly to judge which regeneration strength to adopt according to GPF temperature and carbon loading capacity, and low-temperature city working condition is an extremely severe working condition, and higher regeneration strength than ordinary GPF regeneration needs to be adopted, for example: higher engine target speeds, leaner target air-fuel ratios, and more retarded firing angles, so that GPF can improve regeneration rates under this extreme harsher condition.
Specifically, when the engine is in a low-temperature city operating condition:
if the carbon loading of the GPF is in the first carbon loading range, the GPF enters a passive regeneration mode, and meanwhile, the target air-fuel ratio A is increased along with the increase of the regeneration time of the GPF and the increase of the inlet temperature of the GPFx,ySatisfies A1,1＝A1,2＝A1,3Target ignition efficiency Bx,ySatisfies B1,1＝B1,2＝B1,3Target Engine speed Cx，ySatisfies C1,1＝C1,2＝C1,3；
If the carbon loading of the GPF is in the second carbon loading range, the GPF enters an urban working condition active regeneration mode, and A is carried out along with the increase of the GPF regeneration time and the increase of the GPF inlet temperature2,1＜A2,2＜A2,3，B2,1＜B2,2＜B2,3＝1，C2,1＞C2,2＞C2,3；
If the carbon loading of the GPF is in the third carbon loading range, the GPF enters an urban working condition active regeneration mode, and A is carried out along with the increase of the GPF regeneration time and the increase of the GPF inlet temperature3,1＝A3,2＝A3,3，B3,1＜B3,2＜B3,3＝1，C3,1＞C3,2＞C3,3And A is3,1＞A2,1＞A1,1， B3,1＜B2,1＜B1,1，C3,1＞C2,1＞C1,1，A3,2＞A2,2＞A1,2，B3,2＜B2,2＜B1,2， C3,2＞C2,2＞C1,2，A3,3＞A2,3＞A1,3，B3,3＝B2,3＝B1,3，C3,3＞C2,3＞C1,3；
Wherein A isx,yIndicates the target air-fuel ratio in the x-th carbon loading range and the y-th temperature range, Bx,yIndicates the target ignition efficiency, C, at the x-th carbon loading range, y-th temperature rangex,yThe target engine speed in the x-th carbon loading range and the y-th temperature range is represented by x being 1,2 and 3, which respectively represent the first carbon loading range, the second carbon loading range and the third carbon loading range, and y being 1,2 and 3, which respectively represent the first temperature range, the second temperature range and the third temperature range. For example, B3,2Indicating a third carbon loading range, a target firing efficiency at a second temperature range. The first carbon loading range is less than a first carbon loading threshold, the second carbon loading range is greater than or equal to the first carbon loading threshold and less than a second carbon loading threshold, the third carbon loading range is greater than or equal to the second carbon loading threshold, the first temperature range is less than a first preset temperature, the second temperature range is greater than or equal to the first preset temperature and less than a second preset temperature, and the third temperature range is greater than or equal to the second preset temperature.
See table 1 below for a schematic diagram of the regeneration stage control under low-temperature city operation conditions.
TABLE 1
Figure RE-GDA0002840403430000091
Figure RE-GDA0002840403430000101
In the table, Climit1 is a first carbon load threshold, Climit2 is a second carbon load threshold, 0-Climit1 represents a first carbon load range, Climit1-Climit2 represents a second carbon load range, Climit2 or more represents a third carbon load range, Tlimit1 represents a first preset temperature, Tlimit2 represents a second preset temperature, 0-Tlimit1 represents a first temperature range, Tlimit1-Tlimit2 represents a second temperature range, Tlimit2 represents a third temperature range, Tlimit1 or more < 650 ℃,2 or more < 950 ℃ may be set as values of Tlimit1 or more than 1 and Tlimit 2. It can be seen that when the carbon load of GPF is in the range of 0-Climit1, the target air-fuel ratio, the target ignition efficiency and the target engine speed are not changed in the ranges of 0-Tlimit1, Tlimit1-Tlimit2 and Tlimit2 along with the increase of the GPF inlet temperature; when the carbon load of GPF is in the range of Climit1-Climit2, along with the increase of the GPF inlet temperature, in the ranges of 0-Tlimit1, Tlimit1-Tlimit2 and Tlimit2, the target air-fuel ratio is improved, the target ignition efficiency is improved, the target engine speed is reduced, and after the GPF inlet temperature is greater than or equal to Tlimit2, the target ignition efficiency is kept at 1, and the advance of the ignition angle is not delayed; when the carbon load of the GPF is larger than or equal to Climit2, the target air-fuel ratio is kept unchanged along with the increase of the GPF inlet temperature in the ranges of 0-Tlimit1, Tlimit1-Tlimit2 and Tlimit2, the target ignition efficiency is improved, the target engine speed is reduced, and after the GPF inlet temperature is larger than or equal to Tlimit2, the target ignition efficiency is kept at 1 and the ignition advance angle is not delayed.
In the embodiment of the invention, when the engine is not in the low-temperature city operation condition:
if the carbon loading of the GPF is in the first carbon loading range, the GPF enters a passive regeneration mode, and simultaneously, A increases along with the increase of the regeneration time of the GPF and the increase of the inlet temperature of the GPF1,1＝A1,2＝A1,3，B1,1＝B1,2＝B1,3，C1,1＝C1,2＝C1,3And A is1,1、A1,2、A1,3、B1,1、 B1,2、B1,3、C1,1、C1,2、C1,3Equal to A under low-temperature city operation condition1,1、A1,2、A1,3、B1,1、B1,2、B1,3、C1,1、C1,2、C1,3；
If the carbon loading of the GPF is in the second carbon loading range, the GPF enters a normal active regeneration modeFormula (I), and with increasing GPF regeneration time and increasing GPF inlet temperature, A2,1＜A2,2＜A2,3，B2,1＜B2,2＜B2,3＝1，C2,1＞C2,2＞C2,3And A is2,1、A2,2、 A2,3、C2,1、C2,2、C2,3Less than A under low-temperature city operation condition2,1、A2,2、A2,3、 C2,1、C2,2、C2,3，B2,1、B2,2、B2,3Equal to B under low-temperature urban operation condition2,1、 B2,2、B2,3；
If the carbon loading of the GPF is in the third carbon loading range, the GPF enters a normal active regeneration mode, and A increases with the increase of the GPF regeneration time and the increase of the GPF inlet temperature3,1＝A3,2＝A3,3，B3,1＜B3,2＜B3,3＝1，C3,1＞C3,2＞C3,3And A is3,1、A3,2、A3,3、 C3,1、C3,2、C3,3Less than A under low-temperature city operation condition3,1、A3,2、A3,3、C3,1、 C3,2、C3,3，B3,1、B3,2、B3,3Equal to B under low-temperature urban operation condition3,1、B3,2、 B3,3And A is3,1＞A2,1＞A1,1，B3,1＜B2,1＜B1,1，C3,1＞C2,1＞C1,1， A3,2＞A2,2＞A1,2，B3,2＜B2,2＜B1,2，C3,2＞C2,2＞C1,2，A3,3＞A2,3＞A1,3， B3,3＝B2,3＝B1,3，C3,3＞C2,3＞C1,3。
See table 2 below for a schematic diagram of the regeneration step control under non-low temperature city operating conditions.
TABLE 2
Figure RE-GDA0002840403430000111
It can be seen that when the carbon load of GPF is in the range of 0-Climit1, the target air-fuel ratio, the target ignition efficiency and the target engine speed are not changed in the ranges of 0-Tlimit1, Tlimit1-Tlimit2 and Tlimit2 along with the increase of the GPF inlet temperature; when the carbon load of GPF is in the range of Climit1-Climit2, along with the increase of the GPF inlet temperature, in the ranges of 0-Tlimit1, Tlimit1-Tlimit2 and Tlimit2, the target air-fuel ratio is improved, the target ignition efficiency is improved, the target engine speed is reduced, and after the GPF inlet temperature is greater than or equal to Tlimit2, the target ignition efficiency is kept at 1, and the advance of the ignition angle is not delayed; when the carbon load of the GPF is larger than or equal to Climit2, the target air-fuel ratio is kept unchanged along with the increase of the GPF inlet temperature in the ranges of 0-Tlimit1, Tlimit1-Tlimit2 and Tlimit2, the target ignition efficiency is improved, the target engine speed is reduced, and after the GPF inlet temperature is larger than or equal to Tlimit2, the target ignition efficiency is kept at 1 and the ignition advance angle is not delayed.
The GPF active regeneration control method of the embodiment of the invention is explained by combining a specific example, an automobile carrying a chassis type gasoline engine particle trap starts an engine at-24 ℃ under the urban driving working condition, the carbon capacity of the GPF is greater than Climit1, the running time of the whole urban driving working condition is about 600s, the urban working condition rotating speed is low, the engine load is small, the temperature of a cooling liquid of the engine is slowly increased, the inlet temperature of the GPF is low, the regeneration time of the engine is short or the engine cannot be regenerated due to low temperature of the cooling liquid, the regeneration strength cannot be effectively enhanced, through low-temperature urban working condition simulation, before the automobile is used, the average inlet temperature of the GPF under the low-temperature urban working condition is about 400 ℃, the time for the GPF carbon capacity to limit to reach a first carbon capacity threshold (3.5g) is 31 days, after the automobile is adopted, the low-temperature urban driving working condition can be effectively identified through the invention, and the automobile with the improved engine target idle speed is adopted, The average inlet temperature of GPF under the low-temperature urban working condition is about 480 ℃, the time for limiting the carbon capacity of the GPF to reach the first carbon capacity threshold (3.5g) is 45 days, and through the comparison of the tests, the congestion rate of the GPF under the low-temperature urban working condition is reduced, the GPF can be effectively and actively regenerated under the low-temperature urban driving working condition, and the problems of difficult GPF regeneration and the like caused by low rotating speed and low load of the engine under the urban working condition are solved.
In the embodiment of the invention, after the rotating speed is increased, the engine is under the same ignition advance angle, and after the rotating speed is increased, because the combustion time is basically kept consistent, the corresponding combustion continuous crankshaft rotation angle is increased, so that the exhaust temperature is increased; after the ignition advance angle is delayed, the combustion phase of the engine is correspondingly delayed, the piston moves downwards more to start combustion, and the combustion continues to the later stage of the expansion stroke or even to the exhaust stroke, so that the temperature of burnt gas in the later stage of the expansion stroke and the exhaust process is higher, wherein the specific calculation method of the ignition advance angle is as follows: the actual ignition advance angle is equal to the target ignition advance angle multiplied by the target ignition efficiency correction coefficient; after the air-fuel ratio is lowered, the engine combustion speed becomes slow, so that the exhaust gas temperature rises.
According to the GPF city working condition active regeneration grading control method provided by the embodiment of the invention, when the vehicle is in a low-temperature city running working condition, higher grade regeneration strength than that of a common regeneration working condition is implemented, and with the increase of the carbon loading capacity of the GPF, the time allowed to enter regeneration is gradually shortened, and the regeneration strength is gradually improved, so that the GPF blockage risk under the low-temperature city working condition is reduced, the effective regeneration is realized, and the dynamic property and the economical efficiency of the vehicle are considered.
Referring to fig. 4, an embodiment of the present invention provides a GPF urban condition active regeneration hierarchical control system, which includes an urban condition identification module and an active regeneration control module.
The city working condition identification module is used for judging whether the engine is in a low-temperature city operation working condition or not based on a signal of the vehicle sensor; the active regeneration control module is used for controlling the GPF to enter a normal active regeneration mode when the carbon loading of the GPF is larger than a first carbon loading threshold, the running time of the engine is larger than a first preset time and the engine is not in a low-temperature city running working condition based on the judgment of the city working condition identification module; when the carbon capacity of the GPF is larger than a first carbon capacity threshold, the running time of the engine is larger than a first preset time, and the engine is in a low-temperature city running working condition, the GPF is controlled to enter an city working condition active regeneration mode, then whether the engine exits the low-temperature city running working condition is judged along with the active regeneration of the GPF, if not, the GPF continues to maintain the city working condition active regeneration mode, and if so, the GPF enters a normal active regeneration mode. The signals include a vehicle speed signal, an engine speed signal, a GPF inlet temperature signal, an engine coolant temperature signal, an intake manifold pressure signal, and an ambient temperature signal.
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.

Claims (8)

1. A GPF city working condition active regeneration grading control method is characterized by comprising the following steps:
s1: judging whether a first condition is met or not based on a carbon load signal of the GPF and the operation time of the engine, wherein the first condition is that the carbon load of the GPF is greater than a first carbon load threshold value, the operation time of the engine is greater than a first preset time, if so, turning to S3, and if not, turning to S2;
s2: GPF enters a passive regeneration mode;
s3: judging whether the engine is in a low-temperature city operation condition, if not, turning to S4, and if so, turning to S5;
s4: GPF enters a normal active regeneration mode;
s5: the GPF enters an urban working condition active regeneration mode, then whether a second condition is met is judged along with the active regeneration of the GPF, if not, the GPF continues to maintain the urban working condition active regeneration mode, if yes, the operation goes to S4, and the second condition is that the engine exits the low-temperature urban operation working condition;
wherein, judge whether the engine is in low temperature city operating condition, specifically do: and judging whether the engine is in the urban low-temperature operation working condition or not based on the vehicle speed, the engine rotating speed, the GPF inlet temperature, the engine coolant temperature, the pressure of the intake manifold and the ambient temperature.
2. The GPF city operating condition active regeneration grading control method as claimed in claim 1, characterized in that: under the normal active regeneration mode and the urban working condition active regeneration mode, the rotating speed of the engine is increased, the ignition advance angle is delayed, the target air-fuel ratio of the engine is increased, the rotating speed of the target engine, the target ignition advance angle and the target air-fuel ratio are adjusted along with the increase of the carbon carrying capacity of GPF, the regeneration strength is enhanced step by step, and the regeneration strength under the urban working condition active regeneration mode is greater than that under the normal active regeneration mode.
3. The GPF city operating condition active regeneration staging control method of claim 2, wherein when the engine is in a low temperature city operating condition:
if the carbon loading of the GPF is in the first carbon loading range, the GPF enters a passive regeneration mode, and meanwhile, the target air-fuel ratio A is increased along with the increase of the regeneration time of the GPF and the increase of the inlet temperature of the GPFx,ySatisfies A1,1＝A1,2＝A1,3Target ignition efficiency Bx,ySatisfies B1,1＝B1,2＝B1,3Target Engine speed Cx,ySatisfies C1,1＝C1,2＝C1,3；
If the carbon loading capacity of the GPF is in the second carbon loading capacity range, the GPF enters an urban working condition active regeneration modeFormula (I), and with increasing GPF regeneration time and increasing GPF inlet temperature, A2,1＜A2,2＜A2,3，B2,1＜B2,2＜B2,3＝1，C2,1＞C2,2＞C2,3；
If the carbon loading of the GPF is in the third carbon loading range, the GPF enters an urban working condition active regeneration mode, and A is carried out along with the increase of the GPF regeneration time and the increase of the GPF inlet temperature3,1＝A3,2＝A3,3，B3,1＜B3,2＜B3,3＝1，C3,1＞C3,2＞C3,3And A is3,1＞A2,1＞A1,1，B3,1＜B2,1＜B1,1，C3,1＞C2,1＞C1,1，A3,2＞A2,2＞A1,2，B3,2＜B2,2＜B1,2，C3,2＞C2,2＞C1,2，A3,3＞A2,3＞A1,3，B3,3＝B2,3＝B1,3，C3,3＞C2,3＞C1,3；
Wherein A isx,yIndicates the target air-fuel ratio in the x-th carbon loading range and the y-th temperature range, Bx,yIndicates the target ignition efficiency, C, at the x-th carbon loading range, y-th temperature rangex,yThe method comprises the steps of representing an x-th carbon loading range and a target engine speed in a y-th temperature range, wherein x is 1,2 and 3, and respectively represents a first carbon loading range, a second carbon loading range and a third carbon loading range, y is 1,2 and 3, and respectively represents a first temperature range, a second temperature range and a third temperature range, the first carbon loading range is smaller than a first carbon loading threshold, the second carbon loading range is larger than or equal to the first carbon loading threshold and smaller than a second carbon loading threshold, the third carbon loading range is larger than or equal to the second carbon loading threshold, the first temperature range is smaller than a first preset temperature, the second temperature range is larger than or equal to a first preset temperature and smaller than a second preset temperature, and the third temperature range is larger than or equal to the second preset temperature.
4. The GPF city operating condition active regeneration staging control method of claim 3, wherein when the engine is not in a low temperature city operating condition:
if the carbon loading of the GPF is in the first carbon loading range, the GPF enters a passive regeneration mode, and simultaneously, A increases along with the increase of the regeneration time of the GPF and the increase of the inlet temperature of the GPF1,1＝A1,2＝A1,3，B1,1＝B1,2＝B1,3，C1,1＝C1,2＝C1,3And A is1,1、A1,2、A1,3、B1,1、B1,2、B1,3、C1,1、C1,2、C1,3Equal to A under low-temperature city operation condition1,1、A1,2、A1,3、B1,1、B1,2、B1,3、C1,1、C1,2、C1,3；
If the carbon loading of the GPF is in the second carbon loading range, the GPF enters a normal active regeneration mode, and A increases with the increase of the GPF regeneration time and the increase of the GPF inlet temperature2,1＜A2,2＜A2,3，B2,1＜B2,2＜B2,3＝1，C2,1＞C2,2＞C2,3And A is2,1、A2,2、A2,3、C2,1、C2,2、C2,3Less than A under low-temperature city operation condition2,1、A2,2、A2,3、C2,1、C2,2、C2,3，B2,1、B2,2、B2,3Equal to B under low-temperature urban operation condition2,1、B2,2、B2,3；
If the carbon loading of the GPF is in the third carbon loading range, the GPF enters a normal active regeneration mode, and A increases with the increase of the GPF regeneration time and the increase of the GPF inlet temperature3,1＝A3,2＝A3,3，B3,1＜B3,2＜B3,3＝1，C3,1＞C3,2＞C3,3And A is3,1、A3,2、A3,3、C3,1、C3,2、C3,3Less than A under low-temperature city operation condition3,1、A3,2、A3,3、C3,1、C3,2、C3,3，B3,1、B3,2、B3,3Equal to B under low-temperature urban operation condition3,1、B3,2、B3,3And A is3,1＞A2,1＞A1,1，B3,1＜B2,1＜B1,1，C3,1＞C2,1＞C1,1，A3,2＞A2,2＞A1,2，B3,2＜B2,2＜B1,2，C3,2＞C2,2＞C1,2，A3,3＞A2,3＞A1,3，B3,3＝B2,3＝B1,3，C3,3＞C2,3＞C1,3。
5. The GPF city condition active regeneration grading control method as in claim 3 or 4, characterized by comprising the following steps:
the first carbon loading threshold is 35% of the maximum carbon loading of the GPF;
the second carbon loading threshold is 70% of the GPF maximum carbon loading.
6. The GPF city operating condition active regeneration grading control method of claim 3, wherein: when the vehicle speed is less than the vehicle speed limit value, the engine speed is less than the engine speed limit value, the GPF inlet temperature is less than the temperature limit value, the engine coolant temperature is less than the coolant temperature limit value, the intake manifold pressure is less than the pressure limit value, and the environment temperature is less than the environment temperature limit value, all the conditions are met, the engine is judged to be in the urban low-temperature operation working condition.
7. The GPF urban operating condition active regeneration grading control method according to claim 3, characterized in that the engine exit low temperature urban operating condition is determined under the following conditions: when the vehicle speed is greater than the vehicle speed limit value, the engine speed is greater than the engine speed limit value, the GPF inlet temperature is greater than the temperature limit value, the pressure of the intake manifold is greater than the pressure limit value, one of the conditions is met, and the duration of the continuous satisfaction of the current condition is greater than the set duration.
8. A GPF city working condition active regeneration grading control system is characterized by comprising:
the urban working condition identification module is used for judging whether the engine is in a low-temperature urban operation working condition or not according to a signal of the vehicle sensor;
the active regeneration control module is used for controlling the GPF to enter a normal active regeneration mode when the carbon loading of the GPF is larger than a first carbon loading threshold, the running time of the engine is larger than a first preset time and the engine is not in a low-temperature city running working condition based on the judgment of the city working condition identification module; when the carbon capacity of the GPF is greater than a first carbon capacity threshold, the running time of the engine is greater than a first preset time, and the engine is in a low-temperature city running working condition, controlling the GPF to enter an city working condition active regeneration mode, then judging whether the engine exits the low-temperature city running working condition along with the active regeneration of the GPF, if not, continuing to maintain the city working condition active regeneration mode by the GPF, and if so, entering a normal active regeneration mode by the GPF;
wherein the signals include a vehicle speed signal, an engine speed signal, a GPF inlet temperature signal, an engine coolant temperature signal, an intake manifold pressure signal, and an ambient temperature signal.
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