A vehicle and a fuel injection control method and apparatus therefor

Abstract

The application discloses a vehicle and an oil injection control method and device thereof. The oil injection control method comprises the following steps: obtaining the working mode of an engine; 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 injection amount and a first post-injection amount; if the engine works in an air-fuel ratio control working mode, obtaining a preset second air-fuel ratio and combining a second control model to calculate a second main injection amount and a second post-injection amount. In the working condition with the post-injection being turned on, the difference between the main injection injection efficiency and the post-injection injection efficiency is utilized to appropriately transfer the oil amount of the main injection and the post-injection, so as to realize the torque regulation by changing the fuel amount of the main injection and the post-injection, solve the problem that the engine air system hysteresis limits the torque change range, reduce the smoke degree and improve the dynamic performance of the engine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine, in particular to a vehicle and its fuel injection control method and device. BACKGROUND

[0002] Engine is the main component of vehicle. When engine works in steady state, the deviation between actual value and expected value of engine intake air quantity is small, which can meet the demand.

[0003] However, when engine works in transient state, the hysteresis of engine air system itself will limit the variation range of torque, which makes the power performance of engine worse, and the actual value of engine intake air quantity deviates from the expected value. If the post-injection is started, the actual value and the expected value of intake air quantity will have a large deviation, which will cause the ignition delay, noise, emission deterioration, and the problem of excessive smoke of engine. SUMMARY

[0004] The present application provides a vehicle and its fuel injection control method and device to solve the problem of excessive smoke and limited power performance of existing vehicle engine.

[0005] According to an aspect of the present application, a fuel injection control method is provided, which is applied to an engine, and the method comprises:

[0006] obtaining the working mode of the engine;

[0007] if the engine works in normal working mode, calculating the first air-fuel ratio and combining the first control model to calculate the first main injection quantity and the first post-injection quantity;

[0008] if the engine works in air-fuel ratio control working mode, obtaining the preset second air-fuel ratio and combining the second control model to calculate the second main injection quantity and the second post-injection quantity.

[0009] Further, the calculation of the first air-fuel ratio comprises: calculating the first air-fuel ratio according to the obtained intake air quantity and the rotational speed.

[0010] Further, the combination of the first control model to calculate the first main injection quantity and the first post-injection quantity comprises:

[0011] calculating the smoke limitation oil quantity and the total demand oil quantity according to the obtained intake air quantity and the first air-fuel ratio;

[0012] if the smoke limitation oil quantity is less than the total demand oil quantity, calculating the first post-injection quantity and the first main injection quantity according to the obtained demand torque oil quantity, the smoke limitation oil quantity and the first torque contribution coefficient.

[0013] Further, the first control model comprises:

[0014] qM+△qM+qPof=qSmk;

[0015] qM+△qM+qPof qfac=qBal;

[0016] Wherein, qM+△qM is the first main injection quantity, qPof is the first post-injection quantity, qSmk is the smoke limit injection quantity, qBal is the required torque injection quantity, and qfac is the first torque contribution coefficient.

[0017] Further, the calculating the second main injection quantity and the second post-injection quantity in combination with the second control model comprises:

[0018] According to the acquired required torque injection quantity, required total injection quantity and first torque contribution coefficient, the second post-injection quantity is calculated and then the second main injection quantity is calculated.

[0019] Further, the second control model comprises:

[0020] qM'+△qM'+qPof'=qSum;

[0021] qM'+△qM'+qPof' qfac=qBal;

[0022] Wherein, qM'+△qM' is the second main injection quantity, qPof' is the second post-injection quantity, qSum is the required total injection quantity, qBal is the required torque injection quantity, and qfac is the first torque contribution coefficient.

[0023] Further, the fuel injection control method further comprises: calculating the second air-fuel ratio according to the acquired intake air quantity and the required total injection quantity.

[0024] Further, the fuel injection control method further comprises: calculating the first torque contribution coefficient according to the acquired required torque injection quantity and the rotational speed.

[0025] According to another aspect of the present application, a fuel injection control device is provided, which is applied to an engine, and comprises:

[0026] a working mode judging module, configured to acquire a working mode of the engine;

[0027] a first model control module, configured to, if the engine works in a normal working mode, calculate a first air-fuel ratio and calculate a first main injection quantity and a first post-injection quantity in combination with a first control model;

[0028] The second model control module is configured to, if the engine is operating in the air-fuel ratio control mode, obtain a preset second air-fuel ratio, and calculate a second main injection amount and a second post-injection amount based on the second control model.

[0029] According to another aspect of the present application, there is provided a vehicle comprising an engine and an injection control device as described above.

[0030] In the present application, in the working condition with the post-injection enabled, the difference between the main injection efficiency and the post-injection efficiency is utilized to appropriately transfer the oil amount of the main injection and the post-injection, so as to realize the torque regulation by changing the fuel amount of the main injection and the post-injection, solve the problem that the air system hysteresis of the engine limits the torque variation range, reduce the smoke degree, and improve the dynamic performance of the engine.

[0031] It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the present application or to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative effort based on these drawings.

[0033] Figure 1 is a schematic diagram of an injection control method provided by an embodiment of the present application;

[0034] Figure 2 is a schematic diagram of another injection control method provided by an embodiment of the present application;

[0035] Figure 3 is a schematic diagram of still another injection control method provided by an embodiment of the present application;

[0036] Figure 4 is a schematic diagram of an injection control device provided by an embodiment of the present application;

[0037] Figure 5 is a schematic diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0038] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of embodiments of the present application, rather than all embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work should fall within the protection scope of the present application.

[0039] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in other than the order illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a list of steps or units need not be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to such processes, methods, products or devices.

[0040] Figure 1 is a schematic diagram of an oil injection control method provided by an embodiment of the present application. The embodiment can be applicable to fuel quantity adjustment and control of an engine. The oil injection control method can be executed by an oil injection control device, which can be realized in the form of hardware and / or software, and can be configured in a controller of a vehicle. As shown in Figure 1 The oil injection control method comprises the following steps.

[0041] Step 110: obtaining an operating mode of the engine;

[0042] Step 120: if the engine operates in a normal operating mode, calculating a first air-fuel ratio, and calculating a first main injection quantity and a first post-injection quantity in combination with a first control model;

[0043] Step 130: if the engine operates in an air-fuel ratio control operating mode, obtaining a preset second air-fuel ratio, and calculating a second main injection quantity and a second post-injection quantity in combination with a second control model.

[0044] In this embodiment, the relationship between the different working condition parameters of the engine before leaving the factory and the working mode of the engine can be calibrated in advance and stored in the memory of the vehicle. The controller is connected to the memory and the engine, which can be the vehicle controller or other, not specifically limited. When the vehicle runs after leaving the factory, the controller adjusts the working condition parameters of the engine according to the driving operation of the driver, and then retrieves the related information in the memory for analysis. 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 switch to the working mode. The working mode of the engine under the current working condition is recorded in the controller, so that the working mode of the engine can be obtained in real time by the controller.

[0045] The pre-calibrated engine working mode includes a normal working mode and an air-fuel ratio control working mode. In the normal working mode, the air-fuel ratio of the engine is not fixed but changes according to the working parameters of the engine. In the air-fuel ratio control working mode, the air-fuel ratio of the engine is fixed.

[0046] The first control model of the engine in the normal working mode is also pre-calibrated before leaving the factory and stored in the memory of the vehicle, and the first control model includes the corresponding algorithm. The working mode of the engine can be obtained in real time by the controller. If the engine works in the normal working mode, the first air-fuel ratio is calculated according to the actual working condition parameters of the engine under the current working condition. Then, the first control model is called by the fuel injection control device, and the first main injection amount and the first post-injection amount are calculated by combining the calculated first air-fuel ratio.

[0047] The second control model of the engine in the air-fuel ratio control working mode is also pre-calibrated before leaving the factory and stored in the memory of the vehicle, and the second control model includes the corresponding algorithm. The working mode of the engine can be obtained in real time by the controller. If the engine works in the air-fuel ratio control working mode, the second air-fuel ratio is obtained according to the actual working condition parameters of the engine under the current working condition. It can be understood that the second air-fuel ratio calculated in the air-fuel ratio control working mode is a stable value. Then, the second control model is called by the fuel injection control device, and the second main injection amount and the second post-injection amount are calculated by combining the calculated second air-fuel ratio.

[0048] The air-fuel ratio is the ratio of air mass to fuel mass. The main injection is used for the main injection stage in the combustion process to start the contribution torque. The post-injection is used for injection after the main injection stage, and the main function is to burn the particles in the combustion chamber and regenerate the aftertreatment. The post-injection has a partial contribution to the torque.

[0049] In the present application, in the working condition with the post-injection enabled, the oil quantity of the main injection and the post-injection is appropriately transferred by using the difference between the injection efficiency of the main injection and the injection efficiency of the post-injection, so as to realize the torque regulation by changing the fuel quantity of the main injection and the post-injection, solve the problem that the hysteresis of the engine air system limits the torque variation range, reduce the smoke degree, and improve the dynamic performance of the engine.

[0050] The above is the core technology of the present application. The engine is in different working modes in actual work, and the fuel injection control process of the engine in different working modes is described in detail below.

[0051] For the case that the engine works in the normal working mode, the first air-fuel ratio is calculated, and the first main injection quantity and the first post-injection quantity are calculated in combination with the first control model. Figure 2 is a schematic diagram of another fuel injection control method provided by the embodiment of the present application.

[0052] As shown in Figure 2 , the first air-fuel ratio can be calculated by calculating the first air-fuel ratio (lambda) according to the obtained intake air quantity and the speed.

[0053] The intake air quantity is the air flow. The air flow affects the air-fuel ratio, and in the present embodiment, the influence of the speed on the air-fuel ratio is also considered. Before leaving the factory, the engine is tested according to different air flow and speed to obtain the corresponding air-fuel ratio, which is calibrated and formed into an air flow-speed-air-fuel ratio table, and the mapping table is saved in the memory.

[0054] A sensor for monitoring the air flow is arranged in the engine. The fuel injection control device obtains the actual intake air quantity and the actual speed of the engine at present through the sensor; then, the air flow-speed-air-fuel ratio table is called from the memory, and the air-fuel ratio corresponding to the actual intake air quantity and the actual speed can be obtained by looking up the table. The obtained air-fuel ratio is the first air-fuel ratio. Obviously, at least one of the speed and the air flow of the engine changes, which will affect the specific value of the first air-fuel ratio.

[0055] Optionally, the first main injection quantity and the first post-injection quantity are calculated in combination with the first control model, which includes:

[0056] Step one, according to the obtained intake air quantity and the first air-fuel ratio, calculate the smoke limit oil quantity and the total required oil quantity;

[0057] Step two, if the smoke limit oil quantity is less than the total required oil quantity, calculate the first post-injection quantity according to the obtained required torque oil quantity, the smoke limit oil quantity and the first torque contribution coefficient, and then calculate the first main injection quantity.

[0058] The first control model is provided with an algorithm for calculating the smoke-limiting oil amount, which is equal to the intake air amount divided by the first air-fuel ratio. In this embodiment, the oil injection control device acquires the actual intake air amount of the engine at present through the sensor, and also calculates the first air-fuel ratio at present. Then, according to the smoke-limiting oil amount algorithm in the first control model, the value of the current intake air amount divided by the first air-fuel ratio is determined as the current smoke-limiting oil amount.

[0059] The first control model is provided with a mapping table of engine operating condition parameters and the required total oil amount. Before leaving the factory, the engine is tested under different operating conditions, and the corresponding required total oil amount of the engine under different operating conditions is obtained and calibrated, and a mapping table of the required total oil amount and the engine operating condition is obtained. Then, when the engine operating condition parameters are known, the corresponding required total oil amount can be obtained according to the mapping table. In this embodiment, the oil injection control device acquires the required total oil amount of the engine.

[0060] The first control model is provided with a mapping table of the required torque and the required torque oil amount. Before leaving the factory, the engine is tested according to different fuel requirements, and the corresponding required torque of the engine under different fuel requirements is obtained and calibrated, and a mapping table of the required torque and the fuel requirement is obtained. Alternatively, the engine is tested according to different required torques, and the corresponding fuel requirement of the engine under different required torques is obtained and calibrated, and a mapping table of the required torque and the fuel requirement is obtained. The mapping table includes the corresponding relationship between the required torque and the fuel requirement. Then, when the required torque of the engine is known, the corresponding fuel requirement can be obtained according to the mapping table; or, when the fuel requirement of the engine is known, the corresponding required torque can be obtained according to the mapping table. The fuel requirement corresponding to the required torque is defined as the required torque oil amount, and the required torque oil amount corresponding to different required torques can be different. In this embodiment, the oil injection control device acquires the required torque oil amount of the engine.

[0061] The first control model is provided with an algorithm of the first torque contribution coefficient. The optional fuel injection control method further comprises: calculating the first torque contribution coefficient according to the obtained required torque oil quantity and the rotation speed. Before leaving the factory, the engine is tested according to different rotation speeds and required torque oil quantities, the torque contribution coefficient of the post-injection corresponding to different rotation speeds and required torque oil quantities can be obtained, and the torque contribution coefficient of the post-injection is calibrated, and a mapping table of the rotation speed, the required torque oil quantity and the torque contribution coefficient of the post-injection is obtained, which comprises the corresponding relationship among the rotation speed, the required torque oil quantity and the torque contribution coefficient of the post-injection. Then, when the rotation speed and the required torque oil quantity of the engine are known, the corresponding torque contribution coefficient of the post-injection can be obtained according to the mapping table, and the torque contribution coefficient of the post-injection is the first torque contribution coefficient. In the embodiment, the controller obtains the corresponding torque contribution coefficient of the post-injection according to the current rotation speed and the required torque oil quantity of the engine and according to the mapping table, and the fuel injection control device determines the torque contribution coefficient of the post-injection as the first torque contribution coefficient.

[0062] The fuel injection control device detects whether the smoke limit oil quantity is less than the required total oil quantity. If the smoke limit oil quantity is greater than or equal to the required total oil quantity, the post-injection oil quantity and the main injection oil quantity are maintained in the current oil quantity state, and no adjustment is performed.

[0063] The fuel injection control device detects whether the smoke limit oil quantity is less than the required total oil quantity. If the smoke limit oil quantity is less than the required total oil quantity, it indicates that the required total oil quantity at this time cannot be completely combusted, and since the post-injection also contributes part of the torque, the total contribution torque cannot meet the required torque at this time. Since 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, and the oil quantity of the post-injection is reduced, so that the oil quantity meets the smoke limit requirement and also meets the torque requirement. That is, the first post-injection oil quantity is calculated according to the current required torque oil quantity, the smoke limit oil quantity and the first torque contribution coefficient, and the first main injection oil quantity is calculated according to the first post-injection oil quantity. The adjustment of the post-injection oil quantity and the main injection oil quantity is realized.

[0064] The optional first control model comprises:

[0065] qM+△qM+qPof=qSmk;

[0066] qM+△qM+qPof qfac=qBal;

[0067] Wherein, qM+△qM is the first main injection oil quantity, qPof is the first post-injection oil quantity, qSmk is the smoke limit oil quantity, qBal is the required torque oil quantity, and qfac is the first torque contribution coefficient.

[0068] In the embodiment, the fuel injection control device calculates the first main injection oil quantity and the first post-injection oil quantity according to the first control model. Specifically, the calculation process of the fuel injection control device is as follows:

[0069] 1) 1 minus the first torque contribution coefficient, to obtain a value a;

[0070] 2) the smoke limit oil amount minus the required torque oil amount, to obtain a value b;

[0071] 3) the value b divided by the value a, to obtain a first post-injection oil amount;

[0072] 4) the first post-injection oil amount multiplied by the first torque contribution coefficient, to obtain a value c;

[0073] 5) the required torque oil amount minus the value c, to obtain a first main injection oil amount.

[0074] qM is the original main injection oil amount, the value of the original main injection oil amount minus the first main injection oil amount is △qM, and △qM is the main injection oil amount that needs to be adjusted. That is, the first main injection oil amount and the first post-injection oil amount are obtained, the injection control device adjusts the post-injection oil amount according to the first post-injection oil amount, and the injection control device increases △qM on the basis of the original main injection oil amount to adjust the main injection oil amount to the first main injection oil amount.

[0075] As described above, the engine works in the normal working mode. In the steady state working condition, the deviation between the actual value and the expected value of the engine intake amount is small, which can meet the requirements. However, in the transient working condition, the hysteresis of the air system of the engine itself will limit the torque change range, which will make the power performance of the engine worse, and the actual value of the engine intake amount will deviate from the expected value. If there is a working condition in which the post-injection is turned on, the actual value and the expected value of the intake amount will have a large deviation, which will cause the ignition delay, the noise, the emission deterioration, and the problem of excessive smoke of the engine. In the embodiment, in the working condition in which the post-injection is turned on, the difference between the main injection efficiency and the post-injection efficiency is utilized to appropriately transfer the oil amount of the main injection and the post-injection, so as to realize the torque adjustment under the premise of meeting the smoke limit oil amount, solve the problem of the hysteresis of the air system of the engine limiting the torque change range, reduce the smoke, and improve the dynamic performance of the engine.

[0076] For the case that the engine works in the air-fuel ratio control working mode, a preset second air-fuel ratio is obtained, and a second main injection oil amount and a second post-injection oil amount are calculated in combination with a second control model. Figure 3 is a schematic diagram of another injection control method provided by the embodiment of the application.

[0077] The second control model is provided with an algorithm of air-fuel ratio, the air-fuel ratio being a ratio of air mass to fuel mass. In this case, the fuel mass is the total required fuel quantity, and the air mass is the intake air quantity. In the air-fuel ratio control mode, the air-fuel ratio needs to be fixed. The engine is provided with a sensor for monitoring the air flow, and the fuel injection control device obtains the actual intake air quantity of the engine at present through the sensor. The engine can determine the total required fuel quantity according to the current working condition parameters, and the fuel injection control device obtains the total required fuel quantity of the engine. The optional fuel injection control method further comprises: calculating the second air-fuel ratio according to the obtained intake air quantity and total required fuel quantity. The fuel injection control device determines the second air-fuel ratio as the value obtained by dividing the total required fuel quantity by the intake air quantity.

[0078] It should be noted that in the air-fuel ratio control mode, the total required fuel quantity is a stable value, and the intake air quantity is a stable value, so the second air-fuel ratio calculated is a fixed value in this mode. In addition, in the air-fuel ratio control mode, the total required fuel quantity is almost equal to the smoke limit fuel quantity, so the smoke limit fuel quantity can also be used instead of the total required fuel quantity.

[0079] The optional combination of the second control model for calculating the second main injection quantity and the second post-injection quantity comprises: calculating the second post-injection quantity and then calculating the second main injection quantity according to the obtained required torque fuel quantity, total required fuel quantity and first torque contribution coefficient.

[0080] In this embodiment, the fuel injection control device obtains the required torque fuel quantity, total required fuel quantity and first torque contribution coefficient in the same way as in the normal working mode, which will not be repeated here.

[0081] The second control model is provided with a mapping table of required torque and required torque fuel quantity. Therefore, when the controller knows the required torque of the engine, the corresponding required torque fuel quantity can be obtained according to the mapping table. In this embodiment, the fuel injection control device obtains the required torque fuel quantity of the engine.

[0082] The second control model is provided with a mapping table of engine working condition parameters and total required fuel quantity. Therefore, when the controller knows the working condition parameters of the engine, the corresponding total required fuel quantity can be obtained according to the mapping table. In this embodiment, the fuel injection control device obtains the total required fuel quantity of the engine.

[0083] The second control model is provided with an algorithm of the first torque contribution coefficient. The optional fuel injection control method further comprises: calculating the first torque contribution coefficient according to the obtained required torque fuel quantity and engine speed. Therefore, when the controller knows the engine speed and required torque fuel quantity, the corresponding post-injection torque contribution coefficient can be obtained, which is the first torque contribution coefficient. In this embodiment, the controller calculates the corresponding post-injection torque contribution coefficient according to the current engine speed and required torque fuel quantity, and the fuel injection control device determines the post-injection torque contribution coefficient as the first torque contribution coefficient.

[0084] The fuel injection control device calculates the second post-injection amount and the second main-injection amount based on the required torque oil amount, the total required oil amount, and the first torque contribution factor.

[0085] The optional second control model includes:

[0086] qM' + ΔqM' + qPof' = qSum;

[0087] qM' + ΔqM' + qPof' qfac = qBal;

[0088] where 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 factor.

[0089] In this embodiment, the fuel injection control device calculates the second main-injection amount and the second post-injection amount based on the second control model. Specifically, the calculation process of the fuel injection control device is as follows:

[0090] 1) Subtract the first torque contribution factor from 1 to obtain a value a1;

[0091] 2) Subtract the required torque oil amount from the total required oil amount to obtain a value b1;

[0092] 3) Divide the value b1 by the value a1 to obtain the second post-injection amount;

[0093] 4) Multiply the second post-injection amount by the first torque contribution factor to obtain a value c1;

[0094] 5) Subtract the value c1 from the required torque oil amount to obtain the second main-injection amount.

[0095] qM' is the original main-injection amount, the value obtained by subtracting the second main-injection amount from the original main-injection amount is ΔqM', and ΔqM' is the main-injection oil amount that needs to be adjusted. That is, the second main-injection amount and the second post-injection amount are obtained, the fuel injection control device adjusts the oil amount of the post-injection according to the second post-injection amount, and the fuel injection control device increases ΔqM' based on the original main-injection amount to adjust the oil amount of the main-injection to the second main-injection amount.

[0096] As described above, when the engine operates in the air-fuel ratio control mode, the second air-fuel ratio is kept unchanged, so that the torque change caused by the change of the injection amount is limited by the air system dynamics. In the embodiment, in the working condition with the post-injection enabled, the injection amount of the main injection and the post-injection is appropriately transferred based on the difference between the injection efficiency of the main injection and the post-injection, so that the torque is adjusted by changing the injection amount of the main injection and the post-injection without changing the total injection amount, thereby solving the problem that the air system dynamics of the engine limits the torque change range, reducing the smoke, and improving the dynamic performance of the engine. The injection amount transfer process is a "dynamic amount transfer", which allows the decoupling between the amount change and the torque change, thereby improving the dynamic performance of the engine. It can be understood that, in the air-fuel ratio control mode, the torque increase or decrease can be completed by the injection amount transfer of the post-injection and the main injection, and it needs to be noted that the total injection amount needs to be kept unchanged and the torque change needs to be completed during the injection amount transfer.

[0097] Based on the same inventive concept, the embodiment of the present application provides an injection control device applied to the engine described in any of the above embodiments, and used for executing the injection control method described in any of the above embodiments. Figure 4 is a schematic diagram of the injection control device provided by the embodiment of the present application, as shown in Figure 4 the injection control device comprises: a working mode judgment module 210, configured to acquire the working mode of the engine; a first model control module 220, configured to calculate the first air-fuel ratio and calculate the first main injection amount and the first post-injection amount based on the first control model if the engine operates in the normal working mode; and a second model control module 230, configured to acquire the preset second air-fuel ratio and calculate the second main injection amount and the second post-injection amount based on the second control model if the engine operates in the air-fuel ratio control mode.

[0098] In the embodiment, in the normal working mode, when the transient working condition occurs, the hysteresis of the air system limits the torque change range, and based on the difference between the main injection and the post-injection, the injection amount of the main injection and the post-injection can be appropriately transferred to reduce the smoke and improve the dynamic performance of the engine.

[0099] In the air-fuel ratio control mode, the value of the air-fuel ratio is kept unchanged, so that the torque change caused by the change of the injection amount is also limited by the air system dynamics. Based on the difference between the main injection and the post-injection, the torque change can be realized by changing the injection amount between the main injection and the post-injection without changing the total injection amount.

[0100] Based on the same inventive concept, the embodiment of the present application provides a vehicle, comprising: an engine and the injection control device described in any of the above embodiments.

[0101] In this embodiment, the engine is the engine described in any of the above embodiments, which has the function of a fuel engine, and which includes a main injection and a post injection. The fuel injection control device is configured to execute the fuel injection control method described in any of the above embodiments, and can be integrated in a controller of the vehicle, but is not limited thereto. The vehicle can be a fuel vehicle, and can also be a hybrid vehicle, but is not limited thereto.

[0102] Based on the same inventive concept, the embodiments of the present application provide an electronic device, comprising: at least one processor; and a memory connected with the at least one processor in communication; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the fuel injection control method described in any of the embodiments of the present application. The embodiments of the present application also provide a computer readable storage medium, which stores computer instructions for enabling a processor to execute the fuel injection control method described in any of the embodiments of the present application when the processor executes the computer instructions.

[0103] Figure 5 is a schematic diagram of an electronic device provided by the embodiments of the present application. The electronic device 310 is intended to represent various forms of digital computers, such as laptops, desktops, tablets, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device 310 can also represent various forms of mobile devices, such as personal digital assistants, cellular telephones, smartphones, wearable devices (e.g., headsets, glasses, watches, etc.), and other similar computing devices. The components shown here, their connections and relationships, and their functions, are meant to be examples only, and are not meant to limit implementations of the applications described and / or claimed in this document.

[0104] As shown in Figure 5 The electronic device 310 includes at least one processor 311, and a memory, such as a read-only memory (ROM) 312, a random access memory (RAM) 313, etc., connected with the at least one processor 311 in communication, wherein the memory stores a computer program executable by the at least one processor, and the processor 311 can execute various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 312 or the computer program loaded from the storage unit 318 into the random access memory (RAM) 313. In the RAM 313, various programs and data required for the operation of the electronic device 310 can also be stored. The processor 311, the ROM 312, and the RAM 313 are connected with each other through a bus 314. An input / output (I / O) interface 315 is also connected to the bus 314.

[0105] A plurality of components in the electronic device 310 are connected to the I / O interface 315, including: an input unit 316, such as a keyboard, a mouse, etc.; an output unit 317, such as various types of displays, speakers, etc.; a storage unit 318, such as a magnetic disk, an optical disk, etc.; and a communication unit 319, such as a network card, a modem, a wireless communication transceiver, etc. 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.

[0106] The processor 311 can be various general and / or special purpose processing components with processing and computing capabilities. Some examples of the 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, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 311 performs various methods and processes described above, such as the fuel injection control method.

[0107] In some embodiments, the fuel injection control method can be implemented as a computer program tangibly embodied in a computer readable storage medium, such as the storage unit 318. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device 310 via the ROM 312 and / or the communication unit 319. When the computer program is loaded onto the RAM 313 and executed by the processor 311, one or more steps of the fuel injection control method described above can be performed. Alternatively, in other embodiments, the processor 311 can be configured to perform the fuel injection control method by any other appropriate means, such as by means of firmware.

[0108] Various implementations of the systems and techniques described above can be realized in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a programmable logic device (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0109] Computer programs used to implement the 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, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0110] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0111] To provide interaction with a user, the systems and techniques described herein 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 the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0112] The systems and techniques described herein can be implemented in a computing system that includes a back end 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 herein, or any combination of such back end, 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 a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0113] The computing system can include clients and servers. A client and server are generally 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. A server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, to solve the defects of large management difficulty and weak business scalability in traditional physical host and VPS service.

[0114] It should be understood that the various forms of flow shown above can be re-ordered, added to, or deleted from without departing from the scope of the present disclosure. For example, the steps recited in the present disclosure can be executed in parallel, executed in series, or executed in different orders, as long as the desired results of the technical solutions of the present disclosure can be achieved, and the present disclosure is not limited herein.

[0115] The specific embodiments described above are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that various modifications, combinations, sub-combinations, and alternatives can be made to the specific embodiments without departing from the spirit and principles of the present disclosure. Any further modifications, equivalents, and / or alternatives come within the scope of the present disclosure as set forth in the following claims.

Claims

1. A fuel injection control method, characterized in that, When applied to an engine, the fuel injection control method includes: Obtain the operating mode of the engine; If the engine is operating in normal operating mode, a first air-fuel ratio is calculated, and a first main injection quantity and a first post-injection quantity are calculated in conjunction with a first control model; wherein, calculating the first main injection quantity and the first post-injection quantity in conjunction with the first control model includes: calculating the smoke-limited fuel quantity and the total required fuel quantity based on the obtained intake air volume and the first air-fuel ratio; if the smoke-limited fuel quantity is less than the total required fuel quantity, the first post-injection quantity is calculated based on the obtained required torque fuel quantity, the smoke-limited fuel quantity, and a first torque contribution coefficient, and then the first main injection quantity is calculated; If the engine is operating in the air-fuel ratio control mode, a preset second air-fuel ratio is obtained and the second main injection quantity and the second post-injection quantity are calculated in combination with the second control model; wherein, the calculation of the second main injection quantity and the second post-injection quantity in combination with the second control model includes: calculating the second post-injection quantity and then calculating the second main injection quantity based on the obtained demand torque fuel quantity, the demand total fuel quantity and the first torque contribution coefficient.

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

3. The fuel injection control method according to claim 1, characterized in that, The first control model includes: qM + ΔqM + qPof = qSmk; qM+△qM+qPof qfac=qBal; Wherein, qM+△qM is the first main injection quantity, qPof is the first post injection quantity, qSmk is the smoke-limiting fuel quantity, qBal is the required torque fuel quantity, and qfac is the first torque contribution coefficient.

4. The fuel injection control method according to claim 1, characterized in that, The second control model includes: qM'+△qM'+qPof'=qSum; qM'+△qM'+qPof' qfac=qBal; Wherein, qM'+△qM' is the second main injection quantity, qPof' is the second post injection quantity, qSum is the total required fuel quantity, qBal is the required torque fuel quantity, and qfac is the first torque contribution coefficient.

5. The fuel injection control method according to claim 1, characterized in that, Also includes: The second air-fuel ratio is calculated based on the obtained intake air volume and the total required fuel volume.

6. The fuel injection control method according to claim 1, characterized in that, Also includes: The first torque contribution coefficient is calculated based on the obtained required torque oil quantity and speed.

7. A fuel injection control device, characterized in that, The fuel injection control device, used in engines, includes: The operating mode determination module is used to obtain the operating mode of the engine; The first model control module is used to calculate a first air-fuel ratio and, in conjunction with a first control model, calculate a first main injection quantity and a first post-injection quantity if the engine is operating in normal working mode; wherein, calculating the first main injection quantity and the first post-injection quantity in conjunction with the first control model includes: calculating the smoke-limited fuel quantity and the total required fuel quantity based on the obtained intake air volume and the first air-fuel ratio; if the smoke-limited fuel quantity is less than the total required fuel quantity, calculating the first post-injection quantity and then calculating the first main injection quantity based on the obtained required torque fuel quantity, the smoke-limited fuel quantity, and a first torque contribution coefficient; The second model control module is used to obtain a preset second air-fuel ratio and calculate the second main injection quantity and the second post-injection quantity in combination with the second control model if the engine is operating in the air-fuel ratio control mode; wherein, calculating the second main injection quantity and the second post-injection quantity in combination with the second control model includes: calculating the second post-injection quantity and then calculating the second main injection quantity based on the obtained demand torque fuel quantity, the demand total fuel quantity and the first torque contribution coefficient.

8. A vehicle, characterized in that, include: The engine and the fuel injection control device as described in claim 7.

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