CN114439637B - Method and device for optimizing inlet temperature and reducing oil consumption of engine post-processor - Google Patents
Method and device for optimizing inlet temperature and reducing oil consumption of engine post-processor Download PDFInfo
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- CN114439637B CN114439637B CN202011235366.9A CN202011235366A CN114439637B CN 114439637 B CN114439637 B CN 114439637B CN 202011235366 A CN202011235366 A CN 202011235366A CN 114439637 B CN114439637 B CN 114439637B
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000012544 monitoring process Methods 0.000 claims abstract description 11
- 230000006870 function Effects 0.000 claims description 29
- 239000000446 fuel Substances 0.000 claims description 28
- 238000005457 optimization Methods 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 6
- 239000003344 environmental pollutant Substances 0.000 description 7
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- 239000000243 solution Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
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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
- F02D41/30—Controlling fuel injection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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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
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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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
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
- F02D41/0245—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus by increasing temperature of the exhaust gas leaving the engine
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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
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
- F02D2041/026—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus using an external load, e.g. by increasing generator load or by changing the gear ratio
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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
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
- F02D2250/24—Control of the engine output torque by using an external load, e.g. a generator
Abstract
The invention discloses a method and a device for optimizing inlet temperature and reducing oil consumption of an engine post-processor, a 48v system and a storage medium, wherein the method comprises the following steps: under the condition of controlling the engine to run in a thermal management mode, monitoring the inlet temperature of a post-emission processor of the engine in real time; judging whether the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met or not: if so, controlling the BRM motor to execute a function of reversely dragging the engine while controlling the engine to exit the non-thermal management mode and enter the thermal management mode to operate so as to increase the inlet temperature of the engine exhaust aftertreatment device by increasing the working load of the engine, so that the inlet temperature of the engine exhaust aftertreatment device is higher than or equal to the minimum working temperature of the engine exhaust aftertreatment device when the tail gas emission requirement of the whole vehicle is met; if not, controlling the engine to exit the thermal management mode and enter a non-thermal management mode to operate.
Description
Technical Field
The invention belongs to the technical field of vehicle emission application, and particularly relates to a method and a device for optimizing inlet temperature of an engine post-processor and reducing oil consumption, a 48v system and a storage medium.
Background
At present, stringent diesel vehicle pollutant emission regulations and fuel consumption standards are faced, and large diesel main engine plants and whole vehicle plants are continuously exploring new technical routes to face upcoming four-stage fuel consumption and emission pressure.
When the inlet temperature of the engine exhaust aftertreatment device is low, the engine exhaust aftertreatment device cannot effectively convert harmful pollutants, so that the emission of the engine and the whole vehicle exceeds the standard. In order to solve the problem, the emission regulation is met for emission requirements of engine pollutants, in an engine thermal management mode, when the inlet temperature of an engine exhaust aftertreatment device does not meet the minimum temperature requirement, multiple oil injections are carried out on the engine, so that the aftertreatment device temperature is rapidly increased to the working temperature capable of effectively converting harmful pollutants, and pollutant emission is reduced, therefore, the oil injection quantity in the engine thermal management mode is large, and the disadvantage of high oil consumption is caused.
To address the challenges of four-stage fuel consumption and emissions pressure, the 48v light-mix system of diesel vehicles has received considerable attention. The 48v light mixing system comprises a battery, a BRM (Boost Recuperation Machine, a power recovery motor) motor, a belt, an engine and other traditional whole vehicle components.
The BRM motor is used as a key component of a 48v light mixing system, plays a role in flexible and various adjustment and load control on the whole power system transmission system, and therefore, the role of the BRM motor is important. The engine thermal management system, which is an important component in the engine control unit, determines the emissions performance and the power performance of the engine and its entire vehicle.
There is a need for a method and apparatus for engine aftertreatment inlet temperature optimization and fuel consumption reduction, 48v system, and storage medium.
Disclosure of Invention
The invention aims to solve the technical problem of reducing oil consumption on the premise of ensuring the emission performance of an engine and the whole vehicle thereof.
In order to solve the problems, the invention provides a method and a device for optimizing inlet temperature of an engine after-processor and reducing oil consumption, a 48v system and a storage medium.
In a first aspect, the present invention provides a method for optimizing inlet temperature and reducing fuel consumption of an engine post-processor, applied to a 48v system, the 48v system including an engine and a BRM motor integrated at a rear end of the engine through a belt, and an engine control unit having an engine thermal management mode, the method comprising the steps of:
Under the condition of controlling the engine to run in a thermal management mode, monitoring the inlet temperature of a post-emission processor of the engine in real time;
Judging whether the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met;
When the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the whole vehicle exhaust emission requirement is met, controlling the BRM motor to execute a function of reversely dragging the engine while controlling the engine to exit a non-thermal management mode and enter a thermal management mode to operate so as to increase the inlet temperature of the engine exhaust aftertreatment device by increasing the working load of the engine, so that the inlet temperature of the engine exhaust aftertreatment device is larger than or equal to the lowest working temperature of the engine exhaust aftertreatment device when the whole vehicle exhaust emission requirement is met;
when the inlet temperature of the engine exhaust aftertreatment device is higher than or equal to the lowest working temperature of the engine exhaust aftertreatment device when the tail gas emission requirement of the whole vehicle is met, controlling the engine to exit from the thermal management mode and enter into the non-thermal management mode to operate.
Preferably, in accordance with an embodiment of the present invention, during controlling the engine to exit the thermal management mode and enter the non-thermal management mode of operation, the method further comprises the steps of:
Judging whether the inlet temperature of a processor after engine emission is greater than a preset temperature threshold in real time, wherein the preset temperature threshold is greater than the lowest working temperature;
When the inlet temperature of the engine exhaust aftertreatment device is greater than a preset temperature threshold, the BRM motor is controlled to perform a function of assisting the engine to reduce the inlet temperature of the engine exhaust aftertreatment device by reducing the working load of the engine.
According to an embodiment of the present invention, preferably, the method further comprises the steps of:
During the control of the BRM motor to perform the function of assisting the engine, judging whether the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the tail gas emission requirement of the whole vehicle is met in real time;
When the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met, controlling the engine to exit from a non-thermal management mode and enter into a thermal management mode to operate.
According to an embodiment of the present invention, preferably, the method further comprises:
and when the inlet temperature of the engine exhaust aftertreatment device is less than or equal to a preset temperature threshold value, controlling the BRM motor to keep the current torque unchanged.
According to the embodiment of the invention, preferably, the preset temperature threshold is different from the lowest working temperature of the engine exhaust after-treatment device when the exhaust emission requirement of the whole vehicle is met by 5-10 ℃.
According to the embodiment of the invention, preferably, the minimum working temperature of the engine exhaust after-treatment device when the exhaust emission requirement of the whole vehicle is met is 90 ℃.
In a second aspect, the present invention provides an engine post-processor inlet temperature optimization and fuel consumption reduction control device, including:
the monitoring module is used for monitoring the inlet temperature of the engine exhaust aftertreatment device in real time under the condition that the engine is controlled to run in a thermal management mode;
The judging module is used for judging whether the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the tail gas emission requirement of the whole vehicle is met;
The control module is used for controlling the BRM motor to execute the function of anti-dragging the engine when the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met and controlling the engine to exit the non-thermal management mode and enter the thermal management mode to operate, so that the inlet temperature of the engine exhaust aftertreatment device is increased by increasing the working load of the engine, and the inlet temperature of the engine exhaust aftertreatment device is larger than or equal to the lowest working temperature of the engine exhaust emission aftertreatment device when the exhaust emission requirement of the whole vehicle is met; and when the inlet temperature of the engine exhaust aftertreatment device is higher than or equal to the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met, controlling the engine to exit the thermal management mode and enter the non-thermal management mode to operate.
In a third aspect, the present invention provides a storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the above method.
In a fourth aspect, the present invention provides an engine post-processor inlet temperature optimization and fuel consumption reduction control device comprising a memory and a processor, the memory having stored thereon a computer program which when executed by the processor performs the steps of the above method.
In a fifth aspect, the present invention provides a 48v system comprising:
The inlet temperature optimizing and oil consumption reducing control device of the engine post-processor;
the BRM motor is integrated at the rear end of the engine through a belt, is connected with the inlet temperature optimizing and oil consumption reducing control device of the engine post-processor and is used for executing a preset function to the engine under the control of the inlet temperature optimizing and oil consumption reducing control device of the engine post-processor; and
The engine is connected with the BRM motor and used for changing the work load of the engine by executing a preset function on the engine through the BRM motor so that the inlet temperature of the engine exhaust aftertreatment device is higher than or equal to the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met.
One or more embodiments of the above-described solution may have the following advantages or benefits compared to the prior art:
By applying the method for optimizing the inlet temperature of the engine post-processor and reducing the oil consumption, the inlet temperature of the engine exhaust post-processor is monitored in real time under the condition that the engine is controlled to run in a thermal management mode; judging whether the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met; when the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the whole vehicle exhaust emission requirement is met, controlling the BRM motor to execute a function of reversely dragging the engine while controlling the engine to exit a non-thermal management mode and enter a thermal management mode to operate so as to increase the inlet temperature of the engine exhaust aftertreatment device by increasing the working load of the engine, so that the inlet temperature of the engine exhaust aftertreatment device is larger than or equal to the lowest working temperature of the engine exhaust aftertreatment device when the whole vehicle exhaust emission requirement is met; when the inlet temperature of the engine exhaust aftertreatment device is higher than or equal to the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met, the engine is controlled to exit the thermal management mode and enter the non-thermal management mode to operate, the BRM motor is used for assisting in thermal management to reduce oil consumption, the optimization of the engine thermal management system is realized, the oil consumption of the engine and the whole vehicle is effectively reduced, and therefore the market competitiveness of the engine and the whole vehicle is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention, without limitation to the invention. In the drawings:
FIG. 1 is a flow chart of a method for engine aftertreatment inlet temperature optimization and fuel consumption reduction according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of a method for optimizing inlet temperature and reducing fuel consumption of an engine aftertreatment device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a method for optimizing inlet temperature and reducing fuel consumption of a three-engine aftertreatment device according to an embodiment of the present invention.
Detailed Description
The following will describe embodiments of the present invention in detail with reference to the drawings and examples, thereby solving the technical problems by applying technical means to the present invention, and realizing the technical effects can be fully understood and implemented accordingly. It should be noted that, as long as no conflict is formed, each embodiment of the present invention and each feature of each embodiment may be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.
Example 1
In order to solve the technical problems in the prior art, the embodiment of the invention provides a method for optimizing inlet temperature and reducing oil consumption of an engine post-processor, which is applied to a 48v system, wherein the 48v system comprises a BRM motor integrated at the rear end of an engine through a belt, and an engine control unit is provided with an engine thermal management mode.
Referring to fig. 1, the method for optimizing inlet temperature and reducing fuel consumption of an engine post-processor according to the present embodiment includes the following steps:
S110, under the condition that the engine is controlled to run in a thermal management mode, monitoring the inlet temperature of an exhaust aftertreatment device of the engine in real time;
S120, judging whether the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met:
If yes, go to step S130;
if not, executing step S140;
S130, controlling the BRM motor to execute a function of reversely dragging the engine while controlling the engine to exit from the non-thermal management mode and enter into the thermal management mode to operate, so as to increase the inlet temperature of the engine exhaust aftertreatment device by increasing the working load of the engine, and enabling the inlet temperature of the engine exhaust aftertreatment device to be greater than or equal to the minimum working temperature of the engine exhaust aftertreatment device when the tail gas emission requirement of the whole vehicle is met;
s140, controlling the engine to exit the thermal management mode and enter a non-thermal management mode to operate.
In step S120, the minimum operating temperature of the engine exhaust aftertreatment device is 90 ℃ when the exhaust emission requirement of the whole vehicle is met.
When the method for optimizing the inlet temperature of the engine post-processor and reducing the oil consumption is applied to the field of commercial vehicles, the heat management system of the engine can be assisted by precisely controlling the BRM motor in a 48v system, and the oil consumption of the engine and the whole vehicle of the engine can be reduced.
Example two
In order to solve the above technical problems in the prior art, an embodiment of the present invention provides a method for optimizing inlet temperature and reducing fuel consumption of an engine post-processor, which is applied to a 48v system, wherein the 48v system includes a BRM motor integrated at the rear end of the engine through a belt, and an engine control unit is provided with an engine thermal management mode, wherein the method in the embodiment of the present invention improves step S140 in the embodiment.
Referring to fig. 2, the method of the present embodiment includes the steps of:
s210, under the condition that the engine is controlled to run in a thermal management mode, monitoring the inlet temperature of an exhaust aftertreatment device of the engine in real time;
S220, judging whether the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met;
if yes, go to step S230;
if not, executing step S240;
S230, controlling the BRM motor to execute a function of anti-dragging the engine while controlling the engine to exit from the non-thermal management mode and enter into the thermal management mode to operate, so as to increase the inlet temperature of the engine exhaust aftertreatment device by increasing the working load of the engine, enable the inlet temperature of the engine exhaust aftertreatment device to be greater than or equal to the minimum working temperature of the engine exhaust aftertreatment device when the tail gas emission requirement of the whole vehicle is met, and returning to the step S220;
s240, controlling the engine to exit the thermal management mode and enter a non-thermal management mode to operate;
S250, judging whether the inlet temperature of the engine exhaust post-processor is greater than a preset temperature threshold in real time;
if yes, go to step S260;
if not, go to step S290;
S260, controlling the BRM motor to perform a function of assisting power to the engine so as to reduce the inlet temperature of the engine exhaust aftertreatment device by reducing the working load of the engine, so that the inlet temperature of the engine exhaust aftertreatment device is greater than or equal to the minimum working temperature of the engine exhaust aftertreatment device when the tail gas emission requirement of the whole vehicle is met;
S270, during the period of controlling the BRM motor to perform the function of assisting power to the engine, judging whether the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the whole vehicle exhaust emission requirement is met in real time;
if yes, go to step S280;
If not, returning to the step S250;
S280, controlling the engine to exit from the non-thermal management mode and enter into the thermal management mode to operate, and returning to the step S210;
S290, controlling the BRM motor to keep the current torque unchanged.
In step S250, the difference between the preset temperature threshold and the minimum working temperature of the engine exhaust after-treatment device when the preset temperature threshold is greater than or equal to the minimum working temperature meeting the exhaust emission requirement of the whole vehicle is 5-10 ℃.
After step S230, the method further comprises:
And controlling the BRM motor to keep the current torque unchanged when the inlet temperature of the engine exhaust aftertreatment device is increased to be higher than or equal to the lowest working temperature of the engine exhaust aftertreatment device when the exhaust aftertreatment device meets the tail gas emission requirement of the whole vehicle during the period of controlling the engine to exit from the non-thermal management mode and enter into the thermal management mode to run.
The inlet temperature optimization and oil consumption reduction method of the engine post-processor solves the problems of engine emission heat management and regulation oil consumption in a 48v system, and in a 48v light mixing system, the heat management of the engine is critical to pollutant emission of the engine and the whole vehicle, and is the key point of meeting the regulation. But simultaneously, the pressure of legal fuel consumption is faced, fuel consumption optimization is required to be carried out on the thermal management of the engine, the BRM motor in the 48V system has good flexibility, and the thermal management of the engine can be assisted by using the BRM motor through an accurate control algorithm, so that the BRM motor is used for assisting the thermal management system on the premise of ensuring the thermal management function, and finally, the thermal management system is optimized and the fuel consumption of the whole vehicle can be reduced.
According to the method for optimizing the inlet temperature of the engine post-processor and reducing the oil consumption, the operation of the engine is controlled to be switched between a thermal management mode and a non-thermal management mode according to the magnitude relation between the inlet temperature of the engine post-processor and the lowest working temperature of the engine exhaust post-processor when the exhaust emission requirement of the whole vehicle is met, and the purpose of reducing the fuel consumption is achieved while the inlet temperature of the engine post-processor is ensured to meet the lowest working temperature of the engine exhaust post-processor when the exhaust emission requirement of the whole vehicle is met.
Example III
In order to solve the technical problems in the prior art, the embodiment of the invention also provides a model of an engine post-processor inlet temperature optimization and oil consumption reduction method.
As shown in FIG. 3, TM is an engine thermal management mode of operation; the BRM is a 48v light mixing system motor; the torque is the output torque of the flywheel end of the engine; T_SCR_in is the inlet temperature of the engine exhaust aftertreatment device; normal is the engine non-thermal management mode of operation; total fueling is the overall fuel consumption.
The model of this embodiment consists of three functional modules, a BRM motor operating module, a TM engine thermal management operating module, and a normal engine non-thermal management operating module, respectively.
When the inlet temperature of the engine exhaust after-treatment processor in the TM module is not met with the minimum temperature requirement, the engine load is increased by controlling the BRM motor to reversely drag the engine, so that the engine torque is increased, and the inlet temperature of the engine exhaust after-treatment processor is increased; when the temperature rises, the engine exits from the thermal management operation mode according to the judgment of the thermal management control logic, and enters into the non-thermal management operation with low oil consumption, so that the oil consumption of the engine and the whole vehicle of the engine is reduced on the premise that the requirement of the inlet temperature of a processor after the engine is discharged is finally met.
Specifically, the engine is operated in a thermal management mode, and the engine thermal management controller performs real-time judgment control by judging whether the inlet temperature of the post-processor meets the minimum working temperature h. At this time, when the BRM motor controller detects that the post-processor temperature is lower than h, the BRM reversely drags the engine, increases the working load of the engine, increases the working rotation speed and torque of the engine, and increases the exhaust temperature, thereby increasing the post-processing inlet temperature at this time.
When the inlet temperature of the post-processor is higher than h, the engine exits the thermal management mode and enters the non-thermal management mode, and the combustion fuel injection quantity of the engine is reduced. At the moment, the BRM motor controller also detects that the temperature of the post-processor is higher than h, the BRM motor stops the anti-dragging function, the working load of the engine is reduced, and the fuel injection quantity of the engine is secondarily reduced, so that the overall fuel consumption of the engine and the whole vehicle of the engine is reduced.
When the BRM motor controller detects that the post-treatment temperature is higher than h and reachesWhen the order of magnitude is reached, the BRM motor starts to send positive torque, and a booster function is provided for the engine, so that the working load of the engine is reduced again, the fuel injection quantity of the engine is reduced for three times, and the overall fuel consumption of the engine and the whole vehicle is optimized again.
The control of the three stages is to collect signals in real time and judge and execute the signals, and the operation of the engine is optimized in real time, so that the engine and the whole vehicle are always in the optimal operation interval of performance, emission and oil consumption.
According to the embodiment, on the premise that the temperature requirement of the processor after the emission of the pollutants of the engine is met, the fuel consumption is reduced by changing the running mode of the engine;
the control model of the embodiment can realize the target function on the premise of not changing hardware on a 48v system, optimize products and improve performance and competitiveness;
the control model of the embodiment can provide powerful technical support and a product technical route for four-stage oil consumption and severe emission regulations of the commercial vehicle.
According to the embodiment, the heat management mode and the non-heat management mode are combined, on one hand, when the inlet temperature of the exhaust after-treatment device of the engine does not meet the minimum temperature requirement, the engine is controlled to exit the non-heat management mode and enter the heat management mode to operate, the work load of the engine is increased by reversely dragging the engine through the BRM motor while the engine is subjected to multi-oil injection to improve the inlet temperature of the exhaust after-treatment device of the engine, the work load of the engine is increased by reversely dragging the engine through the BRM motor, the time of multi-oil injection to the engine can be reduced, the purpose of saving fuel is achieved, on the other hand, when the inlet temperature of the exhaust after-treatment device of the engine does not meet the minimum temperature requirement, the engine is controlled to operate in the non-heat management mode, and the purpose of saving fuel is further achieved.
Example IV
In order to solve the technical problems in the prior art, the embodiment of the invention also provides a device for optimizing the inlet temperature of the engine post-processor and controlling the reduction of oil consumption.
The engine post-processor inlet temperature optimizing and oil consumption reducing control device of the embodiment comprises:
the monitoring module is used for monitoring the inlet temperature of the engine exhaust aftertreatment device in real time under the condition that the engine is controlled to run in a thermal management mode;
The judging module is used for judging whether the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the tail gas emission requirement of the whole vehicle is met;
The control module is used for controlling the BRM motor to execute the function of anti-dragging the engine when the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met and controlling the engine to exit the non-thermal management mode and enter the thermal management mode to operate, so that the inlet temperature of the engine exhaust aftertreatment device is increased by increasing the working load of the engine, and the inlet temperature of the engine exhaust aftertreatment device is larger than or equal to the lowest working temperature of the engine exhaust emission aftertreatment device when the exhaust emission requirement of the whole vehicle is met; and when the inlet temperature of the engine exhaust aftertreatment device is higher than or equal to the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met, controlling the engine to exit the thermal management mode and enter the non-thermal management mode to operate.
Example five
In order to solve the technical problems in the prior art, the embodiment of the invention also provides a storage medium.
The storage medium of the present embodiment has stored thereon a computer program which, when executed by a processor, implements the steps of the method of the above embodiment.
Example six
In order to solve the technical problems in the prior art, the embodiment of the invention also provides a device for optimizing the inlet temperature of an engine post-processor and reducing oil consumption, which comprises a memory and a processor, and is characterized in that the memory is stored with a computer program which realizes the steps of the method when being executed by the processor.
Example seven
In order to solve the technical problems in the prior art, the embodiment of the invention also provides a 48v system.
The 48v system of this embodiment includes:
The inlet temperature optimizing and oil consumption reducing control device of the engine post-processor;
the BRM motor is integrated at the rear end of the engine through a belt, is connected with the inlet temperature optimizing and oil consumption reducing control device of the engine post-processor and is used for executing a preset function to the engine under the control of the inlet temperature optimizing and oil consumption reducing control device of the engine post-processor; and
The engine is connected with the BRM motor and used for changing the work load of the engine by executing a preset function on the engine through the BRM motor so that the inlet temperature of the engine exhaust aftertreatment device is higher than or equal to the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met.
Although the embodiments of the present invention are disclosed above, the embodiments are only used for the convenience of understanding the present invention, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is still subject to the scope of the present disclosure as defined by the appended claims.
Claims (7)
1. A method for optimizing inlet temperature and reducing oil consumption of an engine post-processor, which is applied to a 48v system, wherein the 48v system comprises an engine and a BRM motor integrated at the rear end of the engine through a belt, and an engine control unit is provided with an engine thermal management mode, and the method comprises the following steps:
under the condition of controlling the engine to run in a non-thermal management mode, monitoring the inlet temperature of a post-emission processor of the engine in real time;
Judging whether the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met;
When the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the whole vehicle exhaust emission requirement is met, controlling the BRM motor to execute a function of reversely dragging the engine while controlling the engine to exit a non-thermal management mode and enter a thermal management mode to operate so as to increase the inlet temperature of the engine exhaust aftertreatment device by increasing the working load of the engine, so that the inlet temperature of the engine exhaust aftertreatment device is larger than or equal to the lowest working temperature of the engine exhaust aftertreatment device when the whole vehicle exhaust emission requirement is met;
When the inlet temperature of the engine exhaust aftertreatment device is higher than or equal to the lowest working temperature of the engine exhaust aftertreatment device when the tail gas exhaust emission requirement of the whole vehicle is met, controlling the BRM motor to stop reversely dragging the engine, controlling the engine to exit a thermal management mode and enter a non-thermal management mode to operate;
Judging whether the inlet temperature of a processor after engine emission is greater than a preset temperature threshold in real time, wherein the preset temperature threshold is greater than the lowest working temperature;
When the inlet temperature of the engine exhaust aftertreatment device is greater than a preset temperature threshold value, controlling the BRM motor to perform a function of assisting power to the engine so as to reduce the inlet temperature of the engine exhaust aftertreatment device by reducing the working load of the engine;
When the inlet temperature of the engine exhaust aftertreatment device is smaller than or equal to a preset temperature threshold value, controlling the BRM motor to keep the current torque unchanged;
During the control of the BRM motor to perform the function of assisting the engine, judging whether the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the tail gas emission requirement of the whole vehicle is met in real time;
When the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met, controlling the engine to exit from a non-thermal management mode and enter into a thermal management mode to operate.
2. The method of claim 1, wherein the preset temperature threshold differs from a minimum operating temperature of the engine exhaust aftertreatment device when the vehicle exhaust emission requirements are met by 5-10 ℃.
3. The method of claim 1, wherein the minimum operating temperature of the engine exhaust aftertreatment device is 90 ℃ when the vehicle exhaust emission requirements are met.
4. An engine aftertreatment device inlet temperature optimization and fuel consumption reduction control device, characterized by comprising:
the monitoring module is used for monitoring the inlet temperature of the engine exhaust aftertreatment device in real time under the condition that the engine is controlled to run in a non-thermal management mode;
The judging module is used for judging whether the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the tail gas emission requirement of the whole vehicle is met;
The control module is used for controlling the BRM motor to execute the function of anti-dragging the engine when the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met and controlling the engine to exit the non-thermal management mode and enter the thermal management mode to operate, so that the inlet temperature of the engine exhaust aftertreatment device is increased by increasing the working load of the engine, and the inlet temperature of the engine exhaust aftertreatment device is larger than or equal to the lowest working temperature of the engine exhaust emission aftertreatment device when the exhaust emission requirement of the whole vehicle is met; when the inlet temperature of the engine exhaust aftertreatment device is higher than or equal to the lowest working temperature of the engine exhaust aftertreatment device when the tail gas exhaust emission requirement of the whole vehicle is met, controlling the BRM motor to stop reversely dragging the engine, and controlling the engine to exit a thermal management mode and enter a non-thermal management mode to operate;
The functional module is used for judging whether the inlet temperature of the engine exhaust post-processor is greater than a preset temperature threshold in real time, wherein the preset temperature threshold is greater than the lowest working temperature;
A function module for controlling the BRM motor to perform a function of boosting the engine to reduce an inlet temperature of the engine exhaust aftertreatment device by reducing a work load of the engine when the inlet temperature of the engine exhaust aftertreatment device is greater than a preset temperature threshold;
The function module is used for controlling the BRM motor to keep the current torque unchanged when the inlet temperature of the engine exhaust postprocessor is smaller than or equal to a preset temperature threshold value;
The function module is used for judging whether the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the whole vehicle exhaust emission requirement is met in real time during the period of controlling the BRM motor to execute the function of assisting the engine;
And the functional module is used for controlling the engine to exit the non-thermal management mode and enter the thermal management mode to operate when the inlet temperature of the engine exhaust aftertreatment device is smaller than the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met.
5. A storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method according to any of claims 1 to 3.
6. An engine post-processor inlet temperature optimization and fuel consumption reduction control device comprising a memory and a processor, characterized in that the memory has stored thereon a computer program which, when executed by the processor, implements the steps of the method according to any of claims 1 to 3.
7. A 48v system, comprising:
the engine aftertreatment processor inlet temperature optimization and fuel consumption reduction control device of claim 6;
the BRM motor is integrated at the rear end of the engine through a belt, is connected with the inlet temperature optimizing and oil consumption reducing control device of the engine post-processor and is used for executing a preset function to the engine under the control of the inlet temperature optimizing and oil consumption reducing control device of the engine post-processor; and
The engine is connected with the BRM motor and used for changing the work load of the engine by executing a preset function on the engine through the BRM motor so that the inlet temperature of the engine exhaust aftertreatment device is higher than or equal to the lowest working temperature of the engine exhaust aftertreatment device when the exhaust emission requirement of the whole vehicle is met.
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