CN117090703A - Vehicle and fuel injection control method and device thereof - Google Patents

Abstract

The invention discloses a vehicle and an oil injection control method and device thereof, wherein the oil injection control method comprises the following steps: acquiring an operating mode of an engine; if the engine works in a normal working mode, calculating a first air-fuel ratio, and calculating a first main fuel injection quantity and a first post fuel injection quantity by combining a first control model; if the engine works in the air-fuel ratio control working mode, a preset second air-fuel ratio is obtained, and a second main fuel injection quantity and a second post fuel injection quantity are calculated by combining a second control model. In the invention, in the working condition of opening the post injection, the difference between the injection efficiency of the main injection and the injection efficiency of the post injection is utilized to properly transfer the oil quantity of the main injection and the post injection, thereby realizing torque adjustment by changing the fuel quantity of the main injection and the post injection, solving the problem that the hysteresis of an air system of an engine limits the torque variation amplitude, reducing the smoke intensity and improving the dynamic performance of the engine.

Description

Vehicle and fuel injection control method and device thereof

Technical Field

The invention relates to the technical field of engines, in particular to a vehicle and an oil injection control method and device thereof.

Background

The engine is the main component of the vehicle. When the engine works under the steady-state working condition, the deviation between the actual value and the expected value of the air inflow of the engine is small, and the requirement can be met.

However, in the transient working condition, the hysteresis of the air system of the engine can limit the change amplitude of the torque, so that the power performance of the engine is poor, and the actual value of the air inflow of the engine deviates from the expected value. If the post-injection is opened under the working condition, the actual value and the expected value of the air inflow can generate larger deviation, so that ignition delay is caused, noise is generated, emission is deteriorated, and the problem of overlarge smoke intensity of the engine is caused.

Disclosure of Invention

The invention provides a vehicle and an oil injection control method and device thereof, which aim to solve the problems of high smoke intensity and limited power performance of an existing vehicle engine.

According to an aspect of the present invention, there is provided an oil injection control method applied to an engine, the oil injection control method including:

acquiring a working mode of the engine;

if the engine works in a normal working mode, calculating a first air-fuel ratio, and calculating a first main fuel injection quantity and a first post fuel injection quantity by combining a first control model;

and if the engine works in the air-fuel ratio control working mode, acquiring a preset second air-fuel ratio, and calculating a second main fuel injection quantity and a second post fuel injection quantity by combining a second control model.

Further, calculating the first air-fuel ratio includes: the first air-fuel ratio is calculated based on the obtained intake air amount and the rotation speed.

Further, calculating the first main injection quantity and the first post injection quantity in combination with the first control model includes:

calculating smoke limit oil quantity and required total oil quantity according to the acquired air inflow and the first air-fuel ratio;

and if the smoke limit oil quantity is smaller than the required total oil quantity, calculating the first post-injection oil quantity and then calculating the first main injection oil quantity according to the acquired required torque oil quantity, the smoke limit oil quantity and the first torque contribution coefficient.

Further, the first control model includes:

qM+ΔqM+qPof＝qSmk；

qM+ΔqM+qPof*qfac＝qBal；

wherein qm+Δqm is the first main injection amount, qPof is the first post injection amount, qSmk is the smoke limit oil amount, qBal is the required torque oil amount, and qfac is the first torque contribution coefficient.

Further, calculating the second main injection quantity and the second post injection quantity in combination with the second control model includes:

and calculating the second post-injection oil quantity and then calculating the second main injection oil quantity according to the acquired required torque oil quantity, required total oil quantity and first torque contribution coefficient.

Further, the second control model includes:

qM+ΔqM+qPof＝qSum；

qM+ΔqM+qPof*qfac＝qBal；

wherein qm+Δqm is the second main injection amount, qPof is the second post injection amount, qSum is the total required oil amount, qBal is the required torque oil amount, and qfac is the first torque contribution coefficient.

Further, the fuel injection control method further comprises the following steps: and calculating the second air-fuel ratio according to the acquired air inflow and the required total oil quantity.

Further, the fuel injection control method further comprises the following steps: and calculating the first torque contribution coefficient according to the acquired required torque oil quantity and the acquired rotating speed.

According to another aspect of the present invention, there is provided an oil injection control apparatus for use in an engine, the oil injection control apparatus comprising:

the working mode judging module is used for acquiring the working mode of the engine;

the first model control module is used for calculating a first air-fuel ratio and calculating a first main fuel injection quantity and a first post fuel injection quantity by combining a first control model if the engine works in a normal working mode;

and the second model control module is used for acquiring a preset second air-fuel ratio and calculating a second main fuel injection quantity and a second post fuel injection quantity by combining a second control model if the engine works in an air-fuel ratio control working mode.

According to another aspect of the present invention, there is provided a vehicle including: an engine and an injection control device as described above.

In the invention, in the working condition of opening the post injection, the difference between the injection efficiency of the main injection and the injection efficiency of the post injection is utilized to properly transfer the oil quantity of the main injection and the post injection, thereby realizing torque adjustment by changing the fuel quantity of the main injection and the post injection, solving the problem that the hysteresis of an air system of an engine limits the torque variation amplitude, reducing the smoke intensity and improving the dynamic performance of the engine.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an oil injection control method according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of another fuel injection control method according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of another fuel injection control method according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of an injection control device according to an embodiment of the present disclosure;

fig. 5 is a schematic diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Fig. 1 is a schematic diagram of an oil injection control method according to an embodiment of the present invention, where the present embodiment is applicable to the case of fuel amount adjustment and control of an engine, the oil injection control method may be performed by an oil injection control device, and the oil injection control device may be implemented in hardware and/or software, and the oil injection control device may be configured in a controller of a vehicle. As shown in fig. 1, the fuel injection control method includes:

step 110, obtaining an operating mode of an engine;

step 120, if the engine works in a normal working mode, calculating a first air-fuel ratio and combining a first control model to calculate a first main fuel injection quantity and a first post fuel injection quantity;

and 130, if the engine works in the air-fuel ratio control working mode, acquiring a preset second air-fuel ratio, and calculating a second main fuel injection quantity and a second post fuel injection quantity by combining a second control model.

In this embodiment, the relationship between the information such as different working condition parameters of the engine before leaving the factory and the working mode of the engine may be calibrated in advance and stored in the memory of the vehicle. The controller is connected with the memory and the engine respectively, and can be a whole vehicle controller or other controllers, and is not particularly limited. When the vehicle runs after the vehicle leaves the scene, the controller adjusts working condition parameters of the engine according to driving operation of a driver, and then related information in the memory is called for analysis, so that the controller can determine the working mode of the engine under the current working condition according to the actual working condition parameters of the engine, and control the engine to be switched into the working mode. The controller records the working mode of the engine under the current working condition, and then the oil injection control device can acquire the working mode of the engine in real time through the controller.

The pre-calibrated engine operating modes include a normal operating mode and an air-fuel ratio control operating mode. In the normal operation mode, the air-fuel ratio of the engine is not fixed but varies according to the operation parameters of the engine. In the air-fuel ratio control operation mode, the air-fuel ratio of the engine is fixed.

And the first control model of the engine in the normal working mode is obtained by pre-calibration before delivery and is stored in a memory of the vehicle, and the first control model comprises a corresponding algorithm. The oil injection control device can acquire the working mode of the engine in real time through the controller. If the engine is operated in the normal operation mode, the fuel injection control device calculates the air-fuel ratio according to the actual operating condition parameters of the engine under the current operating condition, and the calculated air-fuel ratio is the first air-fuel ratio. Then, the fuel injection control device calls a first control model, and calculates a first main fuel injection amount and a first post fuel injection amount by combining the calculated first air-fuel ratio.

And before leaving the factory, calibrating in advance to obtain a second control model of the engine in the air-fuel ratio control working mode, and storing the second control model in a memory of the vehicle, wherein the second control model comprises a corresponding algorithm. The oil injection control device can acquire the working mode of the engine in real time through the controller. If the engine is operated in the air-fuel ratio control operation mode, the fuel injection control device obtains the air-fuel ratio according to the actual working condition parameters of the engine under the current working condition, the calculated air-fuel ratio is the second air-fuel ratio, and it can be understood that the calculated second air-fuel ratio in the air-fuel ratio control operation mode is a stable value. Then, the fuel injection control device calls a second control model, and calculates a second main fuel injection amount and a second post fuel injection amount by combining the calculated second air-fuel ratio.

The air-fuel ratio is the ratio of the air mass to the fuel mass. The main injection is used to initiate the contribution of torque during the main injection phase of the combustion process. Post-injection is used for injection after the main injection phase, the main effect being to burn off particulates in the combustion chamber and aftertreatment regeneration, the post-injection contributing in part to torque.

In the invention, in the working condition of opening the post injection, the difference between the injection efficiency of the main injection and the injection efficiency of the post injection is utilized to properly transfer the oil quantity of the main injection and the post injection, thereby realizing torque adjustment by changing the fuel quantity of the main injection and the post injection, solving the problem that the hysteresis of an air system of an engine limits the torque variation amplitude, reducing the smoke intensity and improving the dynamic performance of the engine.

The above is the core technology of the present invention, and the engine will be in different operation modes in actual operation, and the fuel injection control process of the engine in different operation modes will be described in detail below.

For the case where the engine is operating in the normal operating mode, a first air-fuel ratio is calculated and a first main injection amount and a first post injection amount are calculated in combination with a first control model. FIG. 2 is a schematic diagram of another fuel injection control method according to an embodiment of the present invention.

As shown in fig. 2, the optional calculation of the first air-fuel ratio includes: a first air-fuel ratio (lambda) is calculated based on the obtained intake air amount and the rotation speed.

The intake air amount is the air flow amount. The air flow rate affects the air-fuel ratio, and in this embodiment, the influence of the rotation speed on the air-fuel ratio is taken into consideration. Before leaving the factory, the engine is tested according to different air flow rates and rotating speeds to obtain corresponding air-fuel ratios, the corresponding air-fuel ratios are calibrated, the corresponding air-fuel ratios are formed into an air flow rate-rotating speed-air-fuel ratio table, and the mapping table is stored in a memory.

The engine is provided with a sensor for monitoring the air flow. The fuel injection control device obtains the current actual air inflow of the engine through a sensor and the current actual rotating speed of the engine; then, the air flow-speed-air-fuel ratio table is called from the memory, and the air-fuel ratio corresponding to the current actual air inflow and the actual speed can be obtained through table lookup, and the obtained air-fuel ratio is the first air-fuel ratio. Obviously, a change in at least one of the rotational speed of the engine and the air flow rate affects a specific value of the first air-fuel ratio.

Optionally calculating the first main injection quantity and the first post injection quantity in combination with the first control model includes:

step one, calculating smoke limit oil quantity and required total oil quantity according to the acquired air inflow and a first air-fuel ratio;

and if the smoke limit oil quantity is smaller than the required total oil quantity, calculating a first post-injection oil quantity and then calculating a first main injection oil quantity according to the acquired required torque oil quantity, smoke limit oil quantity and a first torque contribution coefficient.

An algorithm for smoke limit oil amount, which is equal to the intake air amount divided by the first air-fuel ratio, is provided in the first control model. In this embodiment, the fuel injection control device obtains the current actual air input of the engine through the sensor, and calculates the current first air-fuel ratio, so that the current air input divided by the first air-fuel ratio is determined as the current smoke limit fuel amount according to the smoke limit fuel amount algorithm in the first control model.

The first control model is provided with a mapping table of engine working condition parameters and total oil demand. Before leaving the factory, engines under different working conditions are tested, the corresponding required total oil quantity of the engine under different working conditions can be obtained and calibrated, and a mapping table of the required total oil quantity and the working conditions of the engine can be obtained. And when the controller knows the working condition parameters of the engine, the controller can obtain the corresponding required total oil quantity according to the mapping table. In this embodiment, the fuel injection control device obtains the required total fuel amount of the engine.

The first control model is provided with a mapping table of the required torque and the required torque oil quantity. Before leaving the factory, the engine is tested according to different fuel oil demands, corresponding required torque of the engine under different fuel oil demands can be obtained and calibrated, and a mapping table of the required torque and the fuel oil demands can be obtained. Or testing the engine according to different required torques, obtaining the corresponding fuel oil required amounts of the engine under different required torques, calibrating the fuel oil required amounts, and obtaining a mapping table of the required torques and the fuel oil required amounts. The map includes a correspondence between the required torque and the fuel demand. When the controller knows the required torque of the engine, the controller can obtain the corresponding fuel oil required quantity according to the mapping table; or when the fuel demand of the engine is known, the corresponding demand torque can be obtained according to the mapping table. The fuel demand corresponding to the required torque is defined as the required torque oil amount, and the required torque oil amounts corresponding to different required torques may be different. In this embodiment, the fuel injection control device obtains the required torque fuel amount of the engine.

An algorithm for the first torque contribution coefficient is provided in the first control model. The optional fuel injection control method further comprises the following steps: and calculating a first torque contribution coefficient according to the acquired required torque oil quantity and the acquired rotating speed. Before leaving the factory, the engine is tested according to different rotating speeds and required torque oil quantity, corresponding torque contribution coefficients of post-injection of the engine under different rotating speeds and required torque oil quantity can be obtained and calibrated, and a mapping table of the rotating speeds, the required torque oil quantity and the post-injection torque contribution coefficients can be obtained, wherein the mapping table comprises corresponding relations of the rotating speeds, the required torque oil quantity and the post-injection torque contribution coefficients. When the rotational speed of the engine and the required torque oil quantity are known, the controller can obtain a corresponding post-injection torque contribution coefficient according to the mapping table, wherein the post-injection torque contribution coefficient is the first torque contribution coefficient. In this embodiment, the controller obtains a corresponding post-injection torque contribution coefficient according to the map according to the current rotation speed and the required torque oil amount of the engine, and the fuel injection control device determines the post-injection torque contribution coefficient as the first torque contribution coefficient.

The fuel injection control device detects whether the smoke limit fuel quantity is smaller than the required total fuel quantity, and if the smoke limit fuel quantity is larger than or equal to the required total fuel quantity, the post fuel injection quantity and the main fuel injection quantity maintain the current fuel quantity state and are not adjusted.

The fuel injection control device detects whether the smoke limit fuel quantity is smaller than the required total fuel quantity, if the smoke limit fuel quantity is smaller than the required total fuel quantity, the required total fuel quantity cannot be completely combusted, and the total contribution torque cannot reach the required torque because the post injection also contributes part of torque. Because the contribution torque of the post injection is determined by the efficiency factor, part of the oil quantity of the post injection can be transferred to the main injection, the oil quantity of the main injection is increased, the oil quantity of the post injection is reduced, and the torque requirement is met while the oil quantity meets the smoke limit requirement. The first post-injection oil quantity is calculated according to the current required torque oil quantity, smoke limit oil quantity and a first torque contribution coefficient, and then the first main injection oil quantity is calculated according to the first post-injection oil quantity. The adjustment of the post-injection quantity and the main injection quantity is realized.

The optional first control model includes:

qM+ΔqM+qPof＝qSmk；

qM+ΔqM+qPof*qfac＝qBal；

wherein qm+Δqm is the first main injection amount, qPof is the first post injection amount, qSmk is the smoke limit oil amount, qBal is the required torque oil amount, and qfac is the first torque contribution coefficient.

In this embodiment, the fuel injection control device calculates the first main fuel injection amount and the first post fuel injection amount according to the first control model. Specifically, the calculation process of the oil injection control device is as follows:

1) Subtracting the first torque contribution coefficient from 1 to obtain a value a;

2) Subtracting the required torque oil quantity from the smoke limit oil quantity to obtain a value b;

3) Dividing the value b by the value a to obtain a first post-injection quantity;

4) Multiplying the first post-injection quantity by a first torque contribution coefficient to obtain a value c;

5) The first main fuel injection quantity is obtained by subtracting the value c from the required torque fuel quantity.

qM is the original main injection quantity, the value obtained by subtracting the first main injection quantity from the original main injection quantity is deltaqM, and deltaqM is the quantity of oil to be regulated for main injection. The first main oil injection quantity and the first post oil injection quantity are obtained, the oil injection control device adjusts the post oil injection quantity according to the first post oil injection quantity, and meanwhile, the oil injection control device increases delta qM on the basis of the original main oil injection quantity so as to adjust the main oil injection quantity to be the first main oil injection quantity.

As described above, the engine operates in the normal operation mode. And in the steady-state working condition, the deviation between the actual value and the expected value of the air inflow of the engine is small, so that the requirement can be met. However, in the transient working condition, the hysteresis of the air system of the engine can limit the change amplitude of the torque, so that the power performance of the engine is poor, and the actual value of the air inflow of the engine deviates from the expected value. If the post-injection is opened under the working condition, the actual value and the expected value of the air inflow can generate larger deviation, then ignition delay is caused, noise is generated, emission is deteriorated, and the problem of overlarge smoke intensity of the engine occurs. In the embodiment, in the working condition that the post injection is opened, the difference between the injection efficiency of the main injection and the injection efficiency of the post injection is utilized to properly transfer the oil quantity of the main injection and the post injection, so that the torque adjustment is realized on the premise of meeting the smoke limit oil quantity, the problem of the hysteresis limit torque variation amplitude of an air system of the engine is solved, the smoke is reduced, and the dynamic performance of the engine is improved.

And under the condition that the engine works in the air-fuel ratio control working mode, acquiring a preset second air-fuel ratio, and calculating a second main fuel injection quantity and a second post fuel injection quantity by combining a second control model. Fig. 3 is a schematic diagram of another fuel injection control method according to an embodiment of the present invention.

An algorithm for air-fuel ratio, which is the ratio of air mass to fuel mass, is provided in the second control model. The fuel quality is the total oil quantity required, and the air quality is the air inflow. In the air-fuel ratio control operation mode, the air-fuel ratio needs to be fixed. The engine is provided with a sensor for monitoring air flow, and the fuel injection control device obtains the current actual air inflow of the engine through the sensor. The total required oil quantity of the engine can be determined according to the current working condition parameters, and the oil injection control device obtains the total required oil quantity of the engine. The optional fuel injection control method further comprises the following steps: and calculating a second air-fuel ratio according to the acquired air inflow and the required total oil quantity. The fuel injection control means determines a value obtained by dividing the required total fuel amount by the intake air amount as the second air-fuel ratio.

In the air-fuel ratio control operation mode, the required total oil amount is a stable value, and the intake air amount is a stable value, so the calculated second air-fuel ratio is a fixed value in this mode. In addition, in the air-fuel ratio control operation mode, the required total oil amount is almost equal to the smoke limit oil amount, so the smoke limit oil amount may be used instead of the required total oil amount.

Optionally calculating the second main injection quantity and the second post injection quantity in combination with the second control model includes: and calculating a second post-injection quantity and then calculating a second main injection quantity according to the acquired required torque oil quantity, the required total oil quantity and the first torque contribution coefficient.

In this embodiment, the process of obtaining the required torque oil amount, the required total oil amount and the first torque contribution coefficient by the fuel injection control device is the same as that of the normal operation mode, and the description thereof will not be repeated.

The second control model is provided with a mapping table of the required torque and the required torque oil quantity. The controller can obtain the corresponding required torque oil amount according to the mapping table when knowing the required torque of the engine. In this embodiment, the fuel injection control device obtains the required torque fuel amount of the engine.

And a mapping table of the working condition parameters of the engine and the total oil quantity required is arranged in the second control model. And when the controller knows the working condition parameters of the engine, the controller can obtain the corresponding required total oil quantity according to the mapping table. In this embodiment, the fuel injection control device obtains the required total fuel amount of the engine.

The algorithm of the first torque contribution coefficient is arranged in the second control model. The optional fuel injection control method further comprises the following steps: and calculating a first torque contribution coefficient according to the acquired required torque oil quantity and the acquired rotating speed. When the rotational speed of the engine and the required torque oil quantity are known, the controller can obtain a corresponding post-injection torque contribution coefficient, and the post-injection torque contribution coefficient is the first torque contribution coefficient. In this embodiment, the controller calculates a corresponding post-injection torque contribution coefficient according to the current rotation speed and the required torque oil amount of the engine, and the fuel injection control device determines the post-injection torque contribution coefficient as the first torque contribution coefficient.

The fuel injection control device calculates a second post-fuel injection quantity and then calculates a second main fuel injection quantity according to the acquired required torque fuel quantity, required total fuel quantity and the first torque contribution coefficient.

The optional second control model includes:

qM+ΔqM+qPof＝qSum；

qM+ΔqM+qPof*qfac＝qBal；

wherein qm+Δqm is the second main injection amount, qPof is the second post injection amount, qSum is the total required oil amount, qBal is the required torque oil amount, and qfac is the first torque contribution coefficient.

In this embodiment, the fuel injection control device calculates the second main fuel injection amount and the second post-fuel injection amount according to the second control model. Specifically, the calculation process of the oil injection control device is as follows:

1) Subtracting the first torque contribution coefficient from 1 to obtain a value a1;

2) Subtracting the required torque oil quantity from the required total oil quantity to obtain a value b1;

3) Dividing the value b1 by the value a1 to obtain a second post-injection quantity;

4) Multiplying the second post-injection quantity by the first torque contribution coefficient to obtain a value c1;

5) The required torque oil quantity is subtracted by the value c1 to obtain a second main fuel injection quantity.

qM is the original main injection quantity, the value obtained by subtracting the second main injection quantity from the original main injection quantity is deltaqM, and deltaqM is the quantity of oil to be regulated for main injection. The second main oil injection quantity and the second post oil injection quantity are obtained, the oil injection control device adjusts the post oil injection quantity according to the second post oil injection quantity, and meanwhile, the oil injection control device increases delta qM on the basis of the original main oil injection quantity so as to adjust the main oil injection quantity to the second main oil injection quantity.

As described above, the engine is operated in the air-fuel ratio control operation mode, and the second air-fuel ratio is kept unchanged so that the torque change due to the change in the amount of injected oil will be limited by the aerodynamics. In the embodiment, in the working condition that the post injection is opened, the difference between the injection efficiency of the main injection and the injection efficiency of the post injection is utilized, and the oil quantity of the main injection and the post injection is properly transferred under the condition that the total oil quantity is unchanged, so that the torque adjustment is realized by changing the oil quantity of the main injection and the post injection without changing the total injection oil quantity, the problem that the hysteresis of an air system of an engine limits the torque change amplitude is solved, the smoke intensity is reduced, and the dynamic performance of the engine is improved. This oil mass transfer process is a "dynamic mass transfer" that allows decoupling between the mass and torque changes, thereby improving the dynamic performance of the engine. It will be appreciated that in the air-fuel ratio control mode of operation, torque increase or decrease may be accomplished by shifting the amount of fuel in the post-injection and main injection, taking care that the total fuel amount is maintained during the fuel transfer and that torque changes are accomplished.

Based on the same inventive concept, an embodiment of the present invention provides an oil injection control device, which is applied to the engine according to any of the above embodiments, and is configured to execute the oil injection control method according to any of the above embodiments. Fig. 4 is a schematic diagram of an oil injection control device according to an embodiment of the present invention, where, as shown in fig. 4, the oil injection control device includes: the working mode judging module 210 is configured to obtain a working mode of the engine; the first model control module 220 is configured to calculate a first air-fuel ratio and calculate a first main injection amount and a first post injection amount in combination with the first control model if the engine is operating in a normal operation mode; the second model control module 230 is configured to obtain a preset second air-fuel ratio and calculate a second main injection amount and a second post injection amount in combination with the second control model if the engine is operating in the air-fuel ratio control operation mode.

In this embodiment, in the normal operation mode, when a transient operation condition occurs, the hysteresis of the air system limits the variation range of the torque, and based on the difference between the main injection and the post injection efficiency, the amounts of oil of the main injection and the post injection can be appropriately transferred to reduce smoke, and the power performance of the engine can be improved.

In the air-fuel ratio control operation mode, the value of the air-fuel ratio is kept unchanged, so that torque variation due to variation in the amount of injected oil is also limited by the aerodynamics. Based on the difference between the main injection and the post injection efficiencies, the change in torque can be achieved by changing the amount of fuel between the main injection and the post injection without changing the total injection amount.

Based on the same inventive concept, an embodiment of the present invention provides a vehicle including: an engine and an injection control device as described in any of the above embodiments.

In this embodiment, the engine is the engine according to any of the above embodiments, and the engine has a function of a fuel engine, and includes a main injection and a post injection. The fuel injection control device is used to execute the fuel injection control method described in any of the above embodiments, and the fuel injection control device may be integrated in a controller of a vehicle, but is not limited thereto. The vehicle may be a fuel vehicle or a hybrid vehicle, but is not limited thereto.

Based on the same inventive concept, an embodiment of the present invention provides an electronic device including: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores a computer program executable by the at least one processor, so that the at least one processor can execute the fuel injection control method according to any embodiment of the present invention. The embodiment of the invention also provides a computer readable storage medium, wherein the computer readable storage medium stores computer instructions, and the computer instructions are used for realizing the fuel injection control method according to any embodiment of the invention when being executed by a processor.

Fig. 5 is a schematic diagram of an electronic device according to an embodiment of the present invention. Electronic device 310 is intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic device 310 may also represent various forms of mobile equipment, such as personal digital processing, cellular telephones, smart phones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing equipment. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.

As shown in fig. 5, the electronic device 310 includes at least one processor 311, and a memory communicatively connected to the at least one processor 311, such as a Read Only Memory (ROM) 312, a Random Access Memory (RAM) 313, etc., in which the memory stores computer programs executable by the at least one processor, and the processor 311 may perform various suitable actions and processes according to the computer programs stored in the Read Only Memory (ROM) 312 or the computer programs loaded from the storage unit 318 into the Random Access Memory (RAM) 313. In the RAM313, various programs and data required for the operation of the electronic device 310 may also be stored. The processor 311, the ROM312, and the RAM313 are connected to each other through a bus 314. An input/output (I/O) interface 315 is also connected to bus 314.

Various components in electronic device 310 are connected to I/O interface 315, including: an input unit 316 such as a keyboard, mouse, etc.; an output unit 317 such as various types of displays, speakers, and the like; a storage unit 318 such as a magnetic disk, optical disk, or the like; and a communication unit 319 such as a network card, modem, wireless communication transceiver, or the like. The communication unit 319 allows the electronic device 310 to exchange information/data with other devices through a computer network such as the internet and/or various telecommunication networks.

The processor 311 may be a variety of general and/or special purpose processing components with processing and computing capabilities. Some examples of processor 311 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 311 performs the various methods and processes described above, such as the fuel injection control method.

In some embodiments, the fuel injection control method may be implemented as a computer program tangibly embodied on a computer-readable storage medium, such as storage unit 318. In some embodiments, some or all of the computer program may be loaded and/or installed onto the electronic device 310 via the ROM312 and/or the communication unit 319. When a computer program is loaded into RAM313 and executed by processor 311, one or more steps of the fuel injection control method described above may be performed. Alternatively, in other embodiments, processor 311 may be configured to perform the fuel injection control method by any other suitable means (e.g., by means of firmware).

Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.

A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.

In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.

The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.

The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.

It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.

The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. An oil injection control method, characterized in that it is applied to an engine, comprising:

acquiring a working mode of the engine;

if the engine works in a normal working mode, calculating a first air-fuel ratio, and calculating a first main fuel injection quantity and a first post fuel injection quantity by combining a first control model;

and if the engine works in the air-fuel ratio control working mode, acquiring a preset second air-fuel ratio, and calculating a second main fuel injection quantity and a second post fuel injection quantity by combining a second control model.

2. The fuel injection control method according to claim 1, characterized in that calculating the first air-fuel ratio includes: the first air-fuel ratio is calculated based on the obtained intake air amount and the rotation speed.

3. The fuel injection control method according to claim 1, characterized in that calculating the first main fuel injection quantity and the first post fuel injection quantity in conjunction with the first control model includes:

calculating smoke limit oil quantity and required total oil quantity according to the acquired air inflow and the first air-fuel ratio;

and if the smoke limit oil quantity is smaller than the required total oil quantity, calculating the first post-injection oil quantity and then calculating the first main injection oil quantity according to the acquired required torque oil quantity, the smoke limit oil quantity and the first torque contribution coefficient.

4. The fuel injection control method according to claim 3, characterized in that the first control model includes:

qM+ΔqM+qPof＝qSmk；

qM+ΔqM+qPof*qfac＝qBal；

wherein qm+Δqm is the first main injection amount, qPof is the first post injection amount, qSmk is the smoke limit oil amount, qBal is the required torque oil amount, and qfac is the first torque contribution coefficient.

5. The fuel injection control method according to claim 1, characterized in that calculating the second main fuel injection amount and the second post-fuel injection amount in conjunction with the second control model includes:

and calculating the second post-injection oil quantity and then calculating the second main injection oil quantity according to the acquired required torque oil quantity, required total oil quantity and first torque contribution coefficient.

6. The fuel injection control method according to claim 5, characterized in that the second control model includes:

qM+ΔqM+qPof＝qSum；

qM+ΔqM+qPof*qfac＝qBal；

wherein qm+Δqm is the second main injection amount, qPof is the second post injection amount, qSum is the total required oil amount, qBal is the required torque oil amount, and qfac is the first torque contribution coefficient.

7. The fuel injection control method according to claim 5, characterized by further comprising: and calculating the second air-fuel ratio according to the acquired air inflow and the required total oil quantity.

8. The fuel injection control method according to claim 3 or 5, characterized by further comprising: and calculating the first torque contribution coefficient according to the acquired required torque oil quantity and the acquired rotating speed.

9. An oil injection control device, characterized by being applied to an engine, comprising:

the working mode judging module is used for acquiring the working mode of the engine;

the first model control module is used for calculating a first air-fuel ratio and calculating a first main fuel injection quantity and a first post fuel injection quantity by combining a first control model if the engine works in a normal working mode;

and the second model control module is used for acquiring a preset second air-fuel ratio and calculating a second main fuel injection quantity and a second post fuel injection quantity by combining a second control model if the engine works in an air-fuel ratio control working mode.

10. A vehicle, characterized by comprising: an engine and an injection control device according to claim 9.