CN109162817B - Diesel engine control method and device - Google Patents
Diesel engine control method and device Download PDFInfo
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- CN109162817B CN109162817B CN201811285156.3A CN201811285156A CN109162817B CN 109162817 B CN109162817 B CN 109162817B CN 201811285156 A CN201811285156 A CN 201811285156A CN 109162817 B CN109162817 B CN 109162817B
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- fuel 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
- 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
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention provides a method and a device for controlling a diesel engine, wherein the method is applied to a diesel engine controller and comprises the following steps: under the condition that the current smoke intensity limiting working condition is met, acquiring an air-fuel ratio corresponding to the preset smoke intensity limiting working condition; processing the air-fuel ratio to obtain a new air-fuel ratio, wherein the new air-fuel ratio is greater than the air-fuel ratio; acquiring the current air inflow of the diesel engine, and calculating a target oil injection quantity according to the current air inflow and the new air-fuel ratio; and controlling the diesel engine to execute the fuel injection operation according to the target fuel injection amount. Based on the invention, on one hand, the fuel injection quantity of the diesel engine can be limited by setting the air-fuel ratio, and on the other hand, under the condition that the current air inflow is certain, the target fuel injection quantity obtained by calculating the new air-fuel ratio is smaller than the air-fuel ratio, so that the fuel injection quantity of the diesel engine is further limited. Therefore, the problem that the smoke is generated due to the fact that the air inflow is obviously low and the air inflow rises slowly because of the fact that the oil injection quantity is large under the smoke intensity limiting working condition can be relieved or even avoided.
Description
Technical Field
The invention relates to the technical field of diesel engines, in particular to a diesel engine control method and device.
Background
At present, most diesel engines use a supercharging and intercooling technology, the turbo lag condition generally exists, and due to the fact that the resistance of an intercooler is long, an air inlet pipeline is long and the like, when a vehicle is stationary and an accelerator pedal is violently stepped down or the vehicle is stably stepped down after the accelerator is suddenly released at a high speed, due to the fact that oil injection quantity is large, air inflow is obviously low, and rising is slow, smoke is generated.
Disclosure of Invention
In view of the above, the present invention provides a control method and apparatus for solving the above problems. The technical scheme is as follows:
a diesel engine control method is applied to a diesel engine controller and comprises the following steps:
under the condition that the current smoke intensity limiting working condition is met, acquiring the preset air-fuel ratio corresponding to the preset smoke intensity limiting working condition;
processing the air-fuel ratio to obtain a new air-fuel ratio, wherein the new air-fuel ratio is larger than the air-fuel ratio;
acquiring the current air inflow of the diesel engine, and calculating a target oil injection quantity according to the current air inflow and the new air-fuel ratio;
and controlling the diesel engine to execute the fuel injection operation according to the target fuel injection quantity.
Preferably, the processing the air-fuel ratio to obtain a new air-fuel ratio includes:
acquiring a preset correction factor corresponding to the preset smoke intensity limiting working condition, wherein the correction factor is greater than 1;
and taking the product of the air-fuel ratio and the correction factor as a new air-fuel ratio.
Preferably, the method further comprises:
and generating prompt information for representing the smoke limit.
A diesel engine control device comprising:
the acquisition module is used for acquiring the preset air-fuel ratio corresponding to the preset smoke limit condition under the condition that the current smoke limit condition is met;
the processing module is used for processing the air-fuel ratio to obtain a new air-fuel ratio, and the new air-fuel ratio is larger than the air-fuel ratio;
the calculation module is used for acquiring the current air inflow of the diesel engine and calculating the target oil injection quantity according to the current air inflow and the new air-fuel ratio;
and the control module is used for controlling the diesel engine to execute the oil injection operation according to the target oil injection quantity.
Preferably, the processing module is specifically configured to:
acquiring a preset correction factor corresponding to the preset smoke intensity limiting working condition, wherein the correction factor is greater than 1; and taking the product of the air-fuel ratio and the correction factor as a new air-fuel ratio.
Preferably, the apparatus further comprises:
and the prompt module is used for generating prompt information for representing smoke intensity limit.
According to the diesel engine control method and the diesel engine control device, when the preset smoke intensity limiting working condition is identified, the air-fuel ratio corresponding to the preset smoke intensity limiting working condition is enlarged to obtain the new air-fuel ratio, the target fuel injection quantity is calculated by combining the current air inflow of the diesel engine, and therefore the diesel engine is controlled to execute fuel injection operation according to the target fuel injection quantity.
Based on the invention, on one hand, the fuel injection quantity of the diesel engine can be limited by setting the air-fuel ratio, and on the other hand, the air-fuel ratio is used for representing the ratio of the air inflow and the fuel injection quantity, which can show that under the condition that the current air inflow is certain, compared with the air-fuel ratio, the target fuel injection quantity obtained by calculating the new air-fuel ratio is smaller, so that the fuel injection quantity of the diesel engine is further limited. Therefore, the problem that the smoke is generated due to the fact that the air inflow is obviously low and the air inflow rises slowly because of the fact that the oil injection quantity is large under the smoke intensity limiting working condition can be relieved or even avoided.
In addition, the new air-fuel ratio is obtained by processing the air-fuel ratio instead of directly correlating the preset smoke limit working condition with the new air-fuel ratio, so that the problem of smoke limit in the original working condition without smoke limit can be solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method for controlling a diesel engine according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for controlling a diesel engine according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a diesel engine control device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a diesel engine control method, which is applied to a diesel engine controller, and the flow chart of the method is shown in figure 1, and comprises the following steps:
and S10, acquiring the air-fuel ratio corresponding to the preset smoke limit condition when the current smoke limit condition is met.
In the process of executing step S10, the smoke limit condition may be determined in advance, for example, the vehicle is stationary and the accelerator pedal is pressed down suddenly or the vehicle is stabilized at a high speed and the accelerator is released suddenly and then pressed down suddenly, and specifically, the smoke limit condition may be identified by the intake air amount and the rotation speed of the diesel engine, that is, the corresponding relationship between the intake air amount, the rotation speed and the air-fuel ratio of different diesel engines may be set in advance, so as to determine the current intake air amount of the diesel engine and the air-fuel ratio corresponding to the current rotation speed.
S20, the air-fuel ratio is processed to obtain a new air-fuel ratio, and the new air-fuel ratio is larger than the air-fuel ratio.
In the process of executing step S20, the processing means for making the new air-fuel ratio larger than the air-fuel ratio may be implemented, but the present embodiment is not limited to this, and for example, the product of the air-fuel ratio and a specified correction factor larger than 1 is used as the new air-fuel ratio.
In a specific implementation process, in order to reduce the influence on the vehicle dynamics, the step S20 "processing the air-fuel ratio to obtain the new air-fuel ratio" may adopt the following steps, and the method flowchart of the diesel engine control method is shown in fig. 2:
s201, obtaining a correction factor corresponding to a preset smoke intensity limiting working condition, wherein the correction factor is larger than 1.
In the process of presetting the correction factor corresponding to the preset smoke intensity limiting working condition, the rotating speed and the air inflow of the diesel engine are used as input, the correction factor with the optimal dynamic property can be determined through a real-time test, the corresponding relation among the air inflow, the rotating speed and the correction factor of different diesel engines is established, and then the current air inflow of the diesel engine and the correction factor corresponding to the current rotating speed are determined.
S202, the product of the air-fuel ratio and the correction factor is used as the new air-fuel ratio.
It should be noted that a correction factor smaller than 1 may be set, and in this case, the ratio of the air-fuel ratio and the correction factor is taken as the new air-fuel ratio.
And S30, acquiring the current air inflow of the diesel engine, and calculating the target fuel injection quantity according to the current air inflow and the new air-fuel ratio.
In the process of executing step S30, since the air-fuel ratio is used to characterize the ratio of the intake air amount to the fuel injection amount, the ratio of the current intake air amount and the new air-fuel ratio may be used as the target fuel injection amount.
And S40, controlling the diesel engine to execute the fuel injection operation according to the target fuel injection quantity.
Because the fuel injection quantity of the diesel engine is limited, certain dynamic performance can be reduced, in other embodiments, in order to improve user experience, on the basis of the diesel engine control method shown in fig. 1, the method further comprises the following steps:
and generating prompt information for representing the smoke limit.
The prompt message can be sent to a large central control screen of the vehicle to prompt a user in the forms of characters or voice broadcast and the like. Of course, other modes, such as color lamp flashing, etc., may also be adopted, which is not limited in this embodiment.
According to the diesel engine control method provided by the embodiment of the invention, on one hand, the fuel injection quantity of the diesel engine can be limited by setting the air-fuel ratio, and on the other hand, under the condition that the current air inflow is certain, the target fuel injection quantity obtained by calculating the new air-fuel ratio is smaller than the air-fuel ratio, so that the fuel injection quantity of the diesel engine is further limited. Therefore, the problem that the smoke is generated due to the fact that the air inflow is obviously low and the air inflow rises slowly because of the fact that the oil injection quantity is large under the smoke intensity limiting working condition can be relieved or even avoided.
Based on the diesel engine control method provided by the above embodiment, an embodiment of the present invention further provides a device for executing the diesel engine control method, where a schematic structural diagram of the device is shown in fig. 3, and the device includes:
the acquisition module 10 is configured to acquire an air-fuel ratio corresponding to a preset smoke limit condition when the current smoke limit condition is met;
the processing module 20 is used for processing the air-fuel ratio to obtain a new air-fuel ratio, and the new air-fuel ratio is greater than the air-fuel ratio;
the calculation module 30 is used for acquiring the current air inflow of the diesel engine and calculating the target oil injection quantity according to the current air inflow and the new air-fuel ratio;
and the control module 40 is used for controlling the diesel engine to execute the fuel injection operation according to the target fuel injection quantity.
Optionally, the processing module 20 is specifically configured to:
acquiring a correction factor corresponding to a preset smoke intensity limiting working condition, wherein the correction factor is greater than 1; the product of the air-fuel ratio and the correction factor is taken as the new air-fuel ratio.
Optionally, on the basis of the diesel engine control device shown in fig. 3, the diesel engine control device further includes the following modules:
and the prompt module is used for generating prompt information for representing smoke intensity limit.
The diesel engine control device provided by the embodiment of the invention can limit the fuel injection quantity of the diesel engine by setting the air-fuel ratio on one hand, and on the other hand, under the condition that the current air inflow is certain, the target fuel injection quantity obtained by calculating the new air-fuel ratio is smaller than the air-fuel ratio, so that the fuel injection quantity of the diesel engine is further limited. Therefore, the problem that the smoke is generated due to the fact that the air inflow is obviously low and the air inflow rises slowly because of the fact that the oil injection quantity is large under the smoke intensity limiting working condition can be relieved or even avoided.
The method and the device for controlling the diesel engine provided by the invention are described in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include or include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. A diesel engine control method is applied to a diesel engine controller and comprises the following steps:
under the condition that the current smoke intensity limiting working condition is met, acquiring the preset air-fuel ratio corresponding to the preset smoke intensity limiting working condition;
processing the air-fuel ratio to obtain a new air-fuel ratio, wherein the new air-fuel ratio is larger than the air-fuel ratio;
acquiring the current air inflow of the diesel engine, and calculating a target oil injection quantity according to the current air inflow and the new air-fuel ratio;
controlling the diesel engine to execute oil injection operation according to the target oil injection quantity;
wherein the processing the air-fuel ratio to obtain a new air-fuel ratio comprises:
acquiring a preset correction factor corresponding to the preset smoke intensity limiting working condition, wherein the correction factor is greater than 1;
and taking the product of the air-fuel ratio and the correction factor as a new air-fuel ratio.
2. The method of claim 1, further comprising:
and generating prompt information for representing the smoke limit.
3. A diesel engine control device characterized by comprising:
the acquisition module is used for acquiring the preset air-fuel ratio corresponding to the preset smoke limit condition under the condition that the current smoke limit condition is met;
the processing module is used for processing the air-fuel ratio to obtain a new air-fuel ratio, and the new air-fuel ratio is larger than the air-fuel ratio;
the calculation module is used for acquiring the current air inflow of the diesel engine and calculating the target oil injection quantity according to the current air inflow and the new air-fuel ratio;
the control module is used for controlling the diesel engine to execute oil injection operation according to the target oil injection quantity;
wherein, the processing module is specifically configured to:
acquiring a preset correction factor corresponding to the preset smoke intensity limiting working condition, wherein the correction factor is greater than 1; and taking the product of the air-fuel ratio and the correction factor as a new air-fuel ratio.
4. The apparatus of claim 3, further comprising:
and the prompt module is used for generating prompt information for representing smoke intensity limit.
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| CN201811285156.3A CN109162817B (en) | 2018-10-31 | 2018-10-31 | Diesel engine control method and device |
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| CN201811285156.3A CN109162817B (en) | 2018-10-31 | 2018-10-31 | Diesel engine control method and device |
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| CN112096532B (en) * | 2019-06-18 | 2023-03-14 | 北京福田康明斯发动机有限公司 | Method and system for limiting fuel injection quantity |
| CN110318897B (en) * | 2019-06-27 | 2022-04-15 | 潍柴重机股份有限公司 | Electronic control engine control method based on smoke intensity limitation |
| CN110389037B (en) * | 2019-07-23 | 2021-03-09 | 哈尔滨工程大学 | Diesel engine air intake measuring system |
| CN110671218B (en) * | 2019-09-30 | 2022-04-26 | 潍柴动力股份有限公司 | Control method and device for gas machine |
| CN113266483B (en) * | 2021-05-24 | 2022-10-28 | 潍柴动力股份有限公司 | Smoke intensity control method and system after exhaust braking, storage medium and electronic equipment |
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| JP2009097440A (en) * | 2007-10-17 | 2009-05-07 | Toyota Motor Corp | Combustion state-measuring device of internal combustion engine and control system of internal combustion engine |
| CN103527349A (en) * | 2013-10-31 | 2014-01-22 | 南京林业大学 | Device and method for air supply of diesel engine |
| CN104265474B (en) * | 2014-07-28 | 2016-06-15 | 北京理工大学 | Plateau starting fuel-flow control method equipped with highly supercharged diesel engine vehicle |
| CN106285989A (en) * | 2016-08-15 | 2017-01-04 | 江西汇尔油泵油嘴有限公司 | Distributive value modification method based on rotation speed change and fuel injection control method |
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