CN116776635A - Air charge calculating method and device, terminal equipment and computer storage medium - Google Patents
Air charge calculating method and device, terminal equipment and computer storage medium Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 42
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 879
- 239000000446 fuel Substances 0.000 claims abstract description 397
- 238000012937 correction Methods 0.000 claims abstract description 139
- 238000004364 calculation method Methods 0.000 claims abstract description 73
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- 238000013016 damping Methods 0.000 claims description 29
- 238000001514 detection method Methods 0.000 claims description 17
- 238000013507 mapping Methods 0.000 claims description 17
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
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Abstract
The application discloses a calculation method, a device, terminal equipment and a computer storage medium of air charge, which relate to the technical field of vehicles, and the calculation method of the air charge comprises the following steps: determining an initial fuel ratio corresponding to the methanol fuel; acquiring a fuel ratio correction coefficient table, and correcting the initial fuel ratio based on the fuel ratio correction coefficient table to determine a target methanol fuel ratio; calculating an air flow coefficient corresponding to air, and obtaining a pressure charge conversion coefficient in the cylinder according to the air flow coefficient and the target methanol fuel ratio; and calculating the air partial pressure value in the cylinder, and calculating the air charge corresponding to the air in the mixed fuel according to the pressure charge conversion coefficient and the air partial pressure value. The application can realize the technical effect of enabling the air flow calculation model to calculate the air charge corresponding to the fresh air more accurately when the methanol engine injects the mixed fuel.
Description
Technical Field
The present application relates to the field of vehicle technologies, and in particular, to a method and apparatus for calculating air charge, a terminal device, and a computer readable storage medium.
Background
Because the air-fuel ratio of the methanol fuel and the gasoline fuel in the mixed fuel is different, in the process of injecting the mixed fuel by the methanol engine in the new energy vehicle, the methanol engine needs to be controlled to inject more methanol fuel so as to ensure that the mixed fuel can be fully combusted; however, the methanol fuel is easy to occupy more space in the cylinder of the methanol engine, so that the air charge corresponding to the fresh air actually inhaled by the methanol engine is smaller than the air charge calculated by the methanol engine, and finally the air input of the methanol engine is difficult to control.
Therefore, how to calculate the air charge corresponding to the fresh air more accurately when the methanol engine injects the mixed fuel is also a technical problem that needs to be solved in the industry.
Disclosure of Invention
The main purpose of the present application is to provide a method, a device, a terminal device and a computer readable storage medium for calculating air charge, which aim to enable an air flow calculation model to calculate the air charge corresponding to fresh air more accurately when a methanol engine injects mixed fuel.
In order to achieve the above object, the present application provides a method for calculating an air charge, the method for calculating an air charge being applied to a methanol engine including a cylinder therein, the method for calculating an air charge comprising the steps of:
determining an initial fuel ratio corresponding to the methanol fuel, wherein the initial fuel ratio is the percentage of the methanol fuel in the mixed fuel;
acquiring a fuel ratio correction coefficient table, and correcting the initial fuel ratio based on the fuel ratio correction coefficient table to determine a target methanol fuel ratio;
calculating an air flow coefficient corresponding to air, and obtaining a pressure charge conversion coefficient in the cylinder according to the air flow coefficient and the target methanol fuel ratio;
and calculating the air partial pressure value in the cylinder, and calculating the air charge corresponding to the air in the mixed fuel according to the pressure charge conversion coefficient and the air partial pressure value.
Further, the step of calculating the air flow coefficient corresponding to the air includes:
acquiring a real-time temperature value corresponding to air and acquiring an engine cylinder parameter corresponding to the methanol engine;
And calculating an air flow coefficient corresponding to the air based on the real-time temperature value, the engine cylinder parameter and a preset air flow correction table.
Further, the step of calculating the air flow coefficient corresponding to the air based on the real-time temperature value, the engine cylinder parameter and a preset air flow correction table includes:
converting the real-time temperature value into a thermodynamic temperature value, and obtaining a damping coefficient corresponding to the air according to the engine cylinder parameters and a preset air flow correction table;
and calculating the thermodynamic temperature value and the damping coefficient to obtain the air flow coefficient corresponding to the air.
Further, the engine cylinder parameter includes a valve overlap angle value and an engine speed value, and the step of obtaining a damping coefficient corresponding to the air according to the engine cylinder parameter and a preset air flow correction table includes:
inquiring a preset air flow correction table based on the valve overlap angle value to determine a target valve overlap angle consistent with the valve overlap angle value in each standard valve overlap angle contained in the air flow correction table;
Querying the air flow correction table based on the engine speed value to determine a target engine speed that is consistent with the engine speed value among the standard engine speeds contained in the air flow correction table;
among the standard coefficients included in the air flow correction table, a target coefficient corresponding to the target valve overlap angle and the target engine speed is determined, and the target coefficient is determined as a damping coefficient corresponding to the air.
Further, the fuel ratio correction coefficient table contains each standard methanol fuel ratio and a corrected methanol fuel ratio corresponding to each standard methanol fuel ratio;
the step of correcting the initial fuel ratio based on the fuel ratio correction factor table to determine a target methanol fuel ratio includes:
querying the fuel ratio correction factor table based on the initial fuel duty to determine the standard methanol fuel duty corresponding to the initial fuel duty as a target fuel duty;
and determining the corrected methanol fuel ratio corresponding to the target fuel ratio as a target methanol fuel ratio.
Further, the step of calculating the air partial pressure value in the cylinder includes:
determining an absolute pressure value within the cylinder, and a counter-pressure value within the cylinder, and a cylinder exhaust gas pressure value within the cylinder;
and calculating to obtain the air partial pressure value in the cylinder based on the absolute pressure value, the back air pressure value and the cylinder exhaust gas pressure value.
Further, before the step of acquiring the fuel ratio correction factor table, the method further includes:
acquiring preset standard mixed fuel values, and determining the standard methanol fuel ratio corresponding to each standard mixed fuel value;
determining a standard methanol volume value, a standard methanol pressure value and a standard methanol temperature value which correspond to each standard methanol fuel ratio;
determining nonlinear mapping relations among the standard methanol volume values, the standard methanol pressure values and the standard methanol temperature values, and determining corrected methanol fuel ratios corresponding to the standard methanol fuel ratios based on the nonlinear mapping relations;
and constructing a fuel ratio correction coefficient table based on each of the standard methanol fuel ratios and each of the corrected methanol fuel ratios.
In addition, to achieve the above object, the present application also provides an air charge calculating apparatus, the apparatus comprising:
the system comprises a coefficient correction module, a fuel ratio correction module and a fuel ratio correction module, wherein the coefficient correction module is used for determining a target methanol fuel ratio corresponding to the methanol fuel based on a preset fuel ratio correction coefficient table, and the target methanol fuel ratio is the percentage of the corrected methanol fuel in the mixed fuel;
the first calculation module is used for calculating an air flow coefficient corresponding to air and obtaining a pressure charge conversion coefficient in a cylinder of the methanol engine according to the air flow coefficient and the target methanol fuel ratio;
and the second calculation module is used for calculating the air partial pressure value in the cylinder and calculating the air charge corresponding to the air in the mixed fuel according to the pressure charge conversion coefficient and the air partial pressure value.
In addition, to achieve the above object, the present application also provides a terminal device including: the air charge calculation device comprises a memory and a processor, wherein the memory stores an air charge calculation program capable of running on the processor, and the air charge calculation program realizes the steps of the air charge calculation method when being executed by the processor.
In addition, to achieve the above object, the present application also provides a computer-readable storage medium having stored thereon an air charge calculation program which, when executed by a processor, implements the steps of the air charge calculation method as described above.
The method, the device, the terminal equipment and the computer storage medium for calculating the air charge are applied to a methanol engine, wherein the methanol engine comprises a cylinder, and the initial fuel ratio corresponding to methanol fuel is determined, wherein the initial fuel ratio is the percentage of the methanol fuel in mixed fuel; acquiring a fuel ratio correction coefficient table, and correcting the initial fuel ratio based on the fuel ratio correction coefficient table to determine a target methanol fuel ratio; calculating an air flow coefficient corresponding to air, and obtaining a pressure charge conversion coefficient in the cylinder according to the air flow coefficient and the target methanol fuel ratio; and calculating the air partial pressure value in the cylinder, and calculating the air charge corresponding to the air in the mixed fuel according to the pressure charge conversion coefficient and the air partial pressure value.
In this embodiment, an electronic control unit in a terminal device detects a mixed fuel injected by a methanol engine at first, so as to determine an initial fuel ratio corresponding to methanol fuel in the mixed fuel, and at the same time, the electronic control unit obtains a fuel ratio correction coefficient table stored in advance by a technician, corrects the initial fuel ratio based on the fuel ratio correction coefficient table to obtain a target methanol fuel ratio corresponding to methanol fuel, and then invokes a detection module to detect the methanol engine to obtain an engine cylinder parameter corresponding to the methanol engine and a real-time temperature value corresponding to air in the methanol engine, inputs the engine cylinder parameter, the real-time temperature value and the target methanol fuel ratio to an air flow calculation model preset in the electronic control unit, calculates an air flow coefficient corresponding to air in the cylinder based on the engine cylinder parameter and the real-time temperature value by the air flow calculation model, obtains a pressure charge conversion coefficient in the cylinder based on the target methanol fuel ratio and the air flow coefficient, and finally, the electronic control unit determines an air charge partial pressure value corresponding to air in the cylinder, calculates an air charge value corresponding to air charge value according to the air partial pressure conversion coefficient, and further controls the air charge of the electronic control unit to absorb fresh air.
Therefore, the application corrects the percentage of the methanol fuel in the mixed fuel, and calculates the air charge corresponding to the air based on the corrected target methanol fuel percentage corresponding to the methanol fuel, so that the air charge can still be accurately calculated when the fuel proportion in the mixed fuel changes, and the technical effect that the air charge corresponding to the fresh air can be more accurately calculated when the air charge is injected into the mixed fuel by the air flow calculation model is achieved.
Drawings
Fig. 1 is a schematic structural diagram of a terminal device of a hardware running environment according to an embodiment of the present application;
FIG. 2 is a flow chart of a first embodiment of the method of calculating an air charge of the present application;
FIG. 3 is a flow chart of a second embodiment of the method of calculating an air charge of the present application;
FIG. 4 is a detailed schematic diagram of an air flow correction table according to an embodiment of the air charge calculation method of the present application;
FIG. 5 is a detailed schematic diagram of a fuel ratio correction factor table according to an embodiment of a method for calculating an ignition angle of a methanol engine according to the present application;
FIG. 6 is a flow chart of a preferred embodiment of the method of calculating an air charge of the present application;
Fig. 7 is a schematic diagram of functional modules involved in an embodiment of the air charge computing device of the present application.
The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Referring to fig. 1, fig. 1 is a schematic diagram of a terminal device structure of a hardware running environment according to an embodiment of the present application.
It should be noted that, the terminal device in the embodiment of the present application may be a device for executing the air charge calculation method of the present application, and the terminal device may be a terminal device, a mobile terminal, a data storage control terminal, a PC, or other terminals connected to a vehicle or an electronic control unit matched with the vehicle.
As shown in fig. 1, the terminal device may include: a processor 1001, such as a central processing unit (Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, a memory 1005. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a high-speed random access Memory (Random Access Memory, RAM) Memory or a stable nonvolatile Memory (NVM), such as a disk Memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
It will be appreciated by those skilled in the art that the structure shown in fig. 1 does not constitute a limitation of the terminal device, and may include more or less components than illustrated, or may combine certain components, or may be arranged in different components.
As shown in fig. 1, an operating system, a data storage module, a network communication module, a user interface module, and an aircharge calculation program may be included in the memory 1005 as one storage medium.
In the terminal device shown in fig. 1, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with a user; the processor 1001, the memory 1005 in the terminal device of the present application may be provided in the terminal device, which invokes the calculation program of the air charge stored in the memory 1005 by the processor 1001, and performs the following operations:
determining an initial fuel ratio corresponding to the methanol fuel, wherein the initial fuel ratio is the percentage of the methanol fuel in the mixed fuel;
acquiring a fuel ratio correction coefficient table, and correcting the initial fuel ratio based on the fuel ratio correction coefficient table to determine a target methanol fuel ratio;
Calculating an air flow coefficient corresponding to air, and obtaining a pressure charge conversion coefficient in the cylinder according to the air flow coefficient and the target methanol fuel ratio;
and calculating the air partial pressure value in the cylinder, and calculating the air charge corresponding to the air in the mixed fuel according to the pressure charge conversion coefficient and the air partial pressure value.
Further, the processor 1001 invokes a calculation program of the air charge stored in the memory 1005, and may further perform the following operations:
acquiring a real-time temperature value corresponding to air and acquiring an engine cylinder parameter corresponding to the methanol engine;
and calculating an air flow coefficient corresponding to the air based on the real-time temperature value, the engine cylinder parameter and a preset air flow correction table.
Further, the processor 1001 invokes a calculation program of the air charge stored in the memory 1005, and may further perform the following operations:
converting the real-time temperature value into a thermodynamic temperature value, and obtaining a damping coefficient corresponding to the air according to the engine cylinder parameters and a preset air flow correction table;
and calculating the thermodynamic temperature value and the damping coefficient to obtain the air flow coefficient corresponding to the air.
Further, the engine cylinder parameters include valve overlap angle values and engine speed values, and the processor 1001 may invoke the calculation program of the air charge stored in the memory 1005, and may further perform the following operations:
inquiring a preset air flow correction table based on the valve overlap angle value to determine a target valve overlap angle consistent with the valve overlap angle value in each standard valve overlap angle contained in the air flow correction table;
querying the air flow correction table based on the engine speed value to determine a target engine speed that is consistent with the engine speed value among the standard engine speeds contained in the air flow correction table;
among the standard coefficients included in the air flow correction table, a target coefficient corresponding to the target valve overlap angle and the target engine speed is determined, and the target coefficient is determined as a damping coefficient corresponding to the air.
Further, the fuel ratio correction coefficient table contains each standard methanol fuel ratio and a corrected methanol fuel ratio corresponding to each standard methanol fuel ratio, and the processor 1001 invokes the calculation program of the air charge stored in the memory 1005, and may further execute the following operations:
Querying the fuel ratio correction factor table based on the initial fuel duty to determine the standard methanol fuel duty corresponding to the initial fuel duty as a target fuel duty;
and determining the corrected methanol fuel ratio corresponding to the target fuel ratio as a target methanol fuel ratio.
Further, the processor 1001 invokes a calculation program of the air charge stored in the memory 1005, and may further perform the following operations:
determining an absolute pressure value within the cylinder, and a counter-pressure value within the cylinder, and a cylinder exhaust gas pressure value within the cylinder;
and calculating to obtain the air partial pressure value in the cylinder based on the absolute pressure value, the back air pressure value and the cylinder exhaust gas pressure value.
Further, the processor 1001 invokes a calculation program of the air charge stored in the memory 1005, and may further perform the following operations:
acquiring preset standard mixed fuel values, and determining the standard methanol fuel ratio corresponding to each standard mixed fuel value;
determining a standard methanol volume value, a standard methanol pressure value and a standard methanol temperature value which correspond to each standard methanol fuel ratio;
Determining nonlinear mapping relations among the standard methanol volume values, the standard methanol pressure values and the standard methanol temperature values, and determining corrected methanol fuel ratios corresponding to the standard methanol fuel ratios based on the nonlinear mapping relations;
and constructing a fuel ratio correction coefficient table based on each of the standard methanol fuel ratios and each of the corrected methanol fuel ratios.
Based on the above-described terminal device, the general idea of the air charge calculation method of the present application is provided.
Because the air-fuel ratio of the methanol fuel in the mixed fuel is 6.5 and the air-fuel ratio of the gasoline fuel is 14.7, if the air input of the methanol engine is kept unchanged during the injection of the mixed fuel by the methanol engine in the new energy vehicle, the methanol engine needs to be controlled to inject more methanol fuel so as to ensure that the mixed fuel can be fully combusted; however, the methanol fuel is easy to occupy more space in the cylinder of the methanol engine, so that the air charge corresponding to the fresh air actually inhaled by the methanol engine is smaller than the air charge calculated by the methanol engine, and finally the air input of the methanol engine is difficult to control.
In view of the above phenomena, the present application proposes a method for calculating an air charge, which is applied to a methanol engine including a cylinder therein, the method comprising the steps of: determining an initial fuel ratio corresponding to the methanol fuel, wherein the initial fuel ratio is the percentage of the methanol fuel in the mixed fuel; acquiring a fuel ratio correction coefficient table, and correcting the initial fuel ratio based on the fuel ratio correction coefficient table to determine a target methanol fuel ratio; calculating an air flow coefficient corresponding to air, and obtaining a pressure charge conversion coefficient in the cylinder according to the air flow coefficient and the target methanol fuel ratio; and calculating the air partial pressure value in the cylinder, and calculating the air charge corresponding to the air in the mixed fuel according to the pressure charge conversion coefficient and the air partial pressure value.
Therefore, the application corrects the percentage of the methanol fuel in the mixed fuel, and calculates the air charge corresponding to the air based on the corrected target methanol fuel percentage corresponding to the methanol fuel, so that the air charge can still be accurately calculated when the fuel proportion in the mixed fuel changes, and the technical effect that the air charge corresponding to the fresh air can be more accurately calculated when the air charge is injected into the mixed fuel by the air flow calculation model is achieved.
Based on the above-described overall conception and terminal device of the terminal device and the inventive air charge calculation method, various embodiments of the inventive air charge calculation method are further presented.
Referring to fig. 2, fig. 2 is a flowchart illustrating a first embodiment of a method for calculating an air charge according to the present application.
It should be appreciated that while a logical sequence is illustrated in the flow chart, in some cases the method of air charge calculation of the present application may of course perform the steps illustrated or described in a different order than that which is illustrated herein.
Furthermore, in the present embodiment, the air charge calculation method of the present application is applied to a terminal device connected to an electronic control unit configured in a vehicle and integrated with an air flow calculation model.
As shown in fig. 2, in this embodiment, the method for calculating an air charge according to the present application may include the steps of:
step S10: determining an initial fuel ratio corresponding to the methanol fuel, wherein the initial fuel ratio is the percentage of the methanol fuel in the mixed fuel;
in this embodiment, the terminal device invokes the electronic control unit to detect the methanol engine, so as to determine a percentage value of the methanol fuel in the mixed fuel injected by the methanol engine, and determine the percentage value as an initial fuel ratio corresponding to the methanol fuel.
For example, the terminal device first invokes an ECU (Electronic Control Unit-electronic control unit) to detect the mixed fuel injected from the methanol engine to determine the percentage of the methanol fuel in the mixed fuel and thus determine the percentage as the initial fuel ratio of the methanol fuel in the mixed fuel.
Step S20: acquiring a fuel ratio correction coefficient table, and correcting the initial fuel ratio based on the fuel ratio correction coefficient table to determine a target methanol fuel ratio;
in this embodiment, the electronic control unit reads the storage device in the terminal device to obtain a fuel ratio correction coefficient table preset by a technician, and then corrects the initial fuel ratio based on the fuel ratio correction coefficient table to determine a target methanol fuel ratio corresponding to the initial methanol fuel ratio.
For example, referring to fig. 5, fig. 5 is a detailed schematic diagram of a fuel ratio correction coefficient table according to an embodiment of a method for calculating an ignition angle of a methanol engine according to the present application, when a terminal device is running, firstly, an ECU calls a storage device in the terminal device to obtain a fuel ratio correction coefficient table 1-DT (u) preset by a technician as shown in fig. 5, and then, the ECU queries the fuel ratio correction coefficient table 1-DT (u) based on the initial fuel ratio, so as to correct the initial fuel ratio based on the fuel ratio correction coefficient table 1-DT (u) to determine a target methanol fuel ratio corresponding to the initial fuel ratio (i.e., a corrected methanol ratio in fig. 5).
Further, the fuel ratio correction coefficient table contains each standard methanol fuel ratio and a corrected methanol fuel ratio corresponding to each standard methanol fuel ratio; in a possible embodiment, the step of correcting the initial fuel ratio to determine the target methanol fuel ratio in the step S20 based on the fuel ratio correction coefficient table may specifically include:
step S201: querying the fuel ratio correction factor table based on the initial fuel duty to determine the standard methanol fuel duty corresponding to the initial fuel duty as a target fuel duty;
in this embodiment, the electronic control unit reads the storage device configured in the terminal device to obtain a fuel ratio correction coefficient table preset by a technician, and queries the fuel ratio correction coefficient table based on the initial fuel ratio, so as to determine the standard methanol fuel ratio, which is contained in the fuel ratio correction coefficient table and is consistent with the initial fuel ratio, as the target fuel ratio.
Step S202: determining the corrected methanol fuel ratio corresponding to the target fuel ratio as a target methanol fuel ratio;
in this embodiment, the electronic control unit queries the corrected methanol fuel ratio corresponding to the target fuel ratio in the fuel ratio correction coefficient table, and determines the corrected methanol fuel ratio as the target methanol fuel ratio corresponding to the corrected methanol fuel in the mixed fuel.
For example, the ECU reads a fuel ratio correction coefficient table 1-DT (u) stored in advance by a technician in a storage device in the terminal device, and then, the ECU inquires the fuel ratio correction coefficient table 1-DT (u) based on the initial fuel ratio, so that a standard methanol fuel ratio consistent with the initial fuel ratio contained in the fuel ratio correction coefficient table 1-DT (u) is determined as a target fuel ratio, and further, a corrected methanol fuel ratio corresponding to the target fuel ratio is determined in the fuel ratio correction coefficient table 1-DT (u), and finally, the ECU determines the corrected methanol fuel ratio as a target methanol fuel ratio corresponding to the methanol fuel based on the corrected methanol fuel ratio.
Step S30: calculating an air flow coefficient corresponding to air, and obtaining a pressure charge conversion coefficient in the cylinder according to the air flow coefficient and the target methanol fuel ratio;
in this embodiment, the electronic control unit invokes the detection unit to detect the methanol engine, so as to determine a real-time temperature value corresponding to air contained in a cylinder of the methanol engine and each engine cylinder parameter corresponding to the methanol engine, and input the air temperature value, the engine cylinder parameter and the obtained target methanol fuel ratio into an air flow calculation model preset in the electronic control unit, calculate an air flow coefficient corresponding to air in the cylinder by the air flow calculation model based on the air temperature value and the engine cylinder parameter, and further calculate a pressure charge conversion coefficient in the cylinder according to the air flow coefficient and the target methanol fuel ratio.
For example, the ECU firstly invokes the detection unit to detect the methanol engine, thereby obtaining a real-time temperature value t corresponding to air in a cylinder of the methanol engine and an engine cylinder parameter corresponding to the methanol engine, then the ECU inputs the obtained real-time temperature value t, the engine cylinder parameter and a target methanol fuel ratio together into an air flow calculation model preset in the ECU, calculates an air flow coefficient corresponding to air in the cylinder based on the air temperature value t and the engine cylinder parameter by the air flow calculation model, and then calculates a pressure charge conversion coefficient in the cylinder based on the air flow coefficient and the target methanol fuel ratio by the air flow calculation model
Further, in a possible embodiment, the step of calculating the air flow coefficient corresponding to air in the step S30 may specifically include:
step S301: acquiring a real-time temperature value corresponding to air and acquiring an engine cylinder parameter corresponding to the methanol engine;
in this embodiment, the electronic control unit invokes the detection unit to detect a cylinder in the methanol engine to determine a real-time temperature value corresponding to air in the cylinder, and at the same time, invokes the detection unit to detect the methanol engine to determine a valve overlap angle value and an engine speed value corresponding to the methanol engine, and determines the valve overlap angle value and the engine speed value as engine cylinder parameters.
Step S302: calculating an air flow coefficient corresponding to the air based on the real-time temperature value, the engine cylinder parameter and a preset air flow correction table;
in this embodiment, the electronic control unit reads the storage device to obtain an air flow correction table stored in advance by a technician, and inputs the obtained real-time temperature value, the engine cylinder parameter and the air flow correction table into the air flow calculation model, and the air flow calculation model determines an air flow coefficient corresponding to air in the cylinder based on the real-time temperature value, the engine parameter and the air flow correction table.
For example, referring to fig. 4, fig. 4 is a detailed schematic diagram of an air flow correction table according to an embodiment of the air charge calculation method of the present application, an ECU firstly invokes a temperature sensor configured in a terminal device to detect a cylinder of a methanol engine to obtain a real-time temperature value t of air in the cylinder, and at the same time, invokes a detection unit to detect the methanol engine to obtain a valve overlap angle value and an engine rotation speed value corresponding to the methanol engine, and further determines the valve overlap angle value and the engine rotation speed value as engine cylinder parameters corresponding to the methanol engine, and then the ECU reads a storage device to obtain an air flow correction table 2-DT (u) pre-stored by a technician as shown in fig. 4, and inputs the obtained air flow correction table 2-DT (u), the real-time temperature value t and the engine cylinder parameters together into an air flow calculation model, and then determines an air flow coefficient corresponding to air in the cylinder based on the real-time temperature value t, the engine parameters and the air flow correction table 2-DT (u) by the air flow calculation model.
Further, in a possible embodiment, the step S302 may specifically include:
step S3021: converting the real-time temperature value into a thermodynamic temperature value, and obtaining a damping coefficient corresponding to the air according to the engine cylinder parameters and a preset air flow correction table;
in this embodiment, the air flow calculation model first converts the acquired real-time temperature value into the thermodynamic temperature value, and at the same time, queries an air flow correction table according to the acquired engine cylinder parameters to determine a damping coefficient corresponding to air in the engine cylinder among a plurality of standard damping coefficients contained in the air flow correction table.
Step S3022: calculating the thermodynamic temperature value and the damping coefficient to obtain an air flow coefficient corresponding to the air;
in this embodiment, the air flow calculation model multiplies the obtained damping coefficient and thermodynamic temperature to obtain an air flow coefficient corresponding to air.
For example, the air flow calculation model first adds 273 to the obtained real-time temperature value T to obtain the thermodynamic temperature value T corresponding to the real-time temperature value T br At the same time, the air flow calculation model queries the air flow correction table 2-DT (u) based on the engine cylinder parameters to determine the damping coefficient corresponding to the engine parameter among the plurality of standard damping coefficients contained in the air flow correction table 2-DT (u)The air flow model then takes the thermodynamic temperature value T br Is +_associated with the damping coefficient>Multiplying to obtain the air flow coefficient corresponding to the air.
Further, the step of calculating the damping coefficient corresponding to the air according to the engine cylinder parameter and the preset air flow correction table in the step S3021 may specifically include:
step S30211: inquiring a preset air flow correction table based on the valve overlap angle value to determine a target valve overlap angle consistent with the valve overlap angle value in each standard valve overlap angle contained in the air flow correction table;
step S30212: querying the air flow correction table based on the engine speed value to determine a target engine speed that is consistent with the engine speed value among the standard engine speeds contained in the air flow correction table;
Step S30213: determining a target coefficient corresponding to the target valve overlap angle and the target engine speed from among the standard coefficients included in the air flow correction table, the target coefficient being determined as a damping coefficient corresponding to the air;
exemplary, for example, the air flow calculation model first queries the air flow correction table 2-DT (u) based on the valve overlap angle values and the engine speed values contained in the engine cylinder parameters to determine a target valve overlap angle that corresponds to the valve overlap angle values among the plurality of standard valve angle overlaps contained in the air flow correction table 2-DT (u) and to determine a target engine speed that corresponds to the engine speed values among the plurality of standard engine speeds contained in the air flow correction table 2-DT (u), after which the air flow calculation model determines a target damping coefficient that corresponds to the target valve overlap angle and the target engine speed among the plurality of standard damping coefficients contained in the air flow correction table 2-DT (u)
Step S40: calculating an air partial pressure value in the cylinder, and calculating an air charge corresponding to the air in the mixed fuel according to the pressure charge conversion coefficient and the air partial pressure value;
In this embodiment, the air flow calculation model calculates an air partial pressure value corresponding to air in the cylinder, and obtains a preset charge calculation formula, and then calculates a pressure charge conversion coefficient and the air partial pressure value according to the charge calculation formula to obtain an air charge corresponding to air in the mixed fuel.
For example, the ECU invokes a pressure sensor to detect the cylinder to determine an air partial pressure value Pbr corresponding to air in the cylinder, and inputs the air partial pressure value Pbr to an air flow calculation model, which then obtains a preset charge calculation formula:
the air flow calculation model is further based on the charge calculation formula to pressure charge conversion coefficientAnd calculating the air partial pressure value Pbr to obtain the air charge rl corresponding to the air in the mixed fuel.
Further, in a possible embodiment, the step of calculating the air partial pressure value in the cylinder in the step S40 may specifically include:
step S401: determining an absolute pressure value within the cylinder, and a counter-pressure value within the cylinder, and a cylinder exhaust gas pressure value within the cylinder;
in this embodiment, the electronic control unit first invokes the detection unit to detect the cylinder, thereby determining an absolute pressure value in the cylinder, and a counter-pressure value between the cylinder and the intake manifold, and a cylinder exhaust gas pressure value corresponding to exhaust gas generated in the cylinder.
Step S402: calculating to obtain an air partial pressure value in the cylinder based on the absolute pressure value, the back air pressure value and the cylinder exhaust gas pressure value;
in this embodiment, the electronic control unit subtracts the counter air pressure value and the cylinder exhaust gas pressure value from the absolute pressure value, thereby obtaining an air partial pressure value corresponding to the air in the cylinder, and inputs the air partial pressure value to the air flow calculation model.
For example, the ECU first invokes the detection unit to detect the cylinder to determine absolute pressure values corresponding to all the gases in the cylinder, and a counter-pressure value corresponding to counter-gases generated between the cylinder and the intake manifold, and a cylinder exhaust gas pressure value corresponding to exhaust gases generated in the cylinder, and then, the ECU follows the formula: and calculating an air partial pressure value Pbr corresponding to the air in the cylinder by the absolute pressure value, the back air pressure value and the cylinder exhaust gas pressure value, and inputting the air partial pressure value Pbr into an air flow calculation model.
In this embodiment, the terminal device invokes the electronic control unit to detect the methanol engine, thereby determining a percentage value of the methanol fuel in the mixed fuel injected by the methanol engine, determining the percentage value as an initial fuel ratio corresponding to the methanol fuel, simultaneously, the electronic control unit reads a storage device in the terminal device to obtain a fuel ratio correction coefficient table preset by a technician, the electronic control unit further corrects the initial fuel ratio based on the fuel ratio correction coefficient table to determine a target methanol fuel ratio corresponding to the initial methanol fuel ratio, then the electronic control unit invokes the detection unit to detect the methanol engine, thereby determining a real-time temperature value corresponding to air contained in a cylinder of the methanol engine, and each engine cylinder parameter corresponding to the methanol engine, inputting the air temperature value, the engine cylinder parameter and the obtained target methanol fuel ratio into an air flow calculation model preset in the electronic control unit, calculating an air flow coefficient corresponding to air in the cylinder based on the air temperature value and the engine cylinder parameter by the air flow calculation model, further calculating a pressure conversion coefficient in the cylinder according to the air flow coefficient and the target methanol fuel ratio, finally calculating the air flow coefficient conversion coefficient corresponding to the air flow coefficient and the air charge partial pressure coefficient corresponding to the air pressure conversion coefficient calculation formula.
Therefore, the application corrects the percentage of the methanol fuel in the mixed fuel, and calculates the air charge corresponding to the air based on the corrected target methanol fuel percentage corresponding to the methanol fuel, so that the air charge can still be accurately calculated when the fuel proportion in the mixed fuel changes, and the technical effect that the air charge corresponding to the fresh air can be more accurately calculated when the air charge is injected into the mixed fuel by the air flow calculation model is achieved.
Further, based on the above-described first embodiment of the air charge calculation method of the present application, a second embodiment of the air charge calculation method of the present application is presented herein.
Referring to fig. 3, fig. 3 is a flowchart of a second embodiment of the method for calculating an air charge according to the present application, as shown in fig. 3, before the step S20, the method for calculating an air charge according to the present application may further include the following steps:
step A10: acquiring preset standard mixed fuel values, and determining the standard methanol fuel ratio corresponding to each standard mixed fuel value;
in this embodiment, the electronic control unit first needs to obtain, in the storage device, each of the mixed fuel values stored in advance by the technician, and determine the standard methanol fuel ratio corresponding to each of the mixed fuel values.
Step A20: determining a standard methanol volume value, a standard methanol pressure value and a standard methanol temperature value which correspond to each standard methanol fuel ratio;
in this embodiment, the electronic control unit determines the standard methanol volume value, the standard methanol pressure value, and the standard methanol temperature value corresponding to each standard methanol fuel ratio.
Step A30: determining nonlinear mapping relations among the standard methanol volume values, the standard methanol pressure values and the standard methanol temperature values, and determining corrected methanol fuel ratios corresponding to the standard methanol fuel ratios based on the nonlinear mapping relations;
in this embodiment, the electronic control unit determines the standard methanol pressure value and the standard methanol temperature value corresponding to each standard methanol volume value, so as to determine the nonlinear mapping relationship among each standard methanol volume value, each standard methanol pressure value and each standard methanol temperature value, and further generate each corrected methanol fuel ratio corresponding to each standard methanol fuel ratio based on each nonlinear mapping relationship.
Step A40: constructing a fuel ratio correction factor table based on each of the standard methanol fuel ratios and each of the corrected methanol fuel ratios;
In the present embodiment, the electronic control unit constructs a fuel ratio correction coefficient table based on each of the generated correction methanol fuel ratios and the standard methanol fuel ratios respectively corresponding to each of the correction methanol fuel ratios, and stores the fuel ratio correction coefficient table in the storage device.
For example, the ECU first reads the storage device to obtain each of the mixed fuel values stored in advance by the technician, and determines a standard methanol fuel ratio corresponding to each of the mixed fuel values, and at the same time, the ECU determines a preset standard methanol volume value, a standard methanol pressure value, and a standard methanol temperature value corresponding to each of the standard methanol fuel ratios, and determines a nonlinear mapping relationship among each of the standard methanol volume values, each of the standard methanol pressure values, and each of the standard methanol temperature values, and then generates a corrected methanol fuel ratio corresponding to each of the standard methanol fuel ratios based on each of the nonlinear mapping relationships, and finally, the ECU constructs a fuel ratio correction coefficient table based on each of the standard methanol fuel ratios, and the corrected methanol fuel ratio corresponding to each of the standard methanol fuel ratios, and stores the fuel ratio correction coefficient table in the storage device.
In this embodiment, the electronic control unit first obtains the values of each mixed fuel stored in advance by a technician in the storage device, determines the respective corresponding standard methanol fuel ratios of each mixed fuel value, then determines the respective corresponding standard methanol volume value, standard methanol pressure value and standard methanol temperature value of each standard methanol fuel ratio, then determines the respective corresponding standard methanol pressure value and standard methanol temperature value of each standard methanol volume value, thereby determining the nonlinear mapping relationship among the respective standard methanol volume value, the respective standard methanol pressure value and the respective standard methanol temperature value, further generates the respective corrected methanol fuel ratio corresponding to the respective standard methanol fuel ratio based on the respective nonlinear mapping relationship, finally, the electronic control unit constructs a fuel ratio correction coefficient table based on the generated respective corrected methanol fuel ratio and the respective corresponding standard methanol fuel ratio, and stores the fuel ratio correction coefficient table in the storage device.
In this way, the application determines the standard correction coefficient corresponding to each standard methanol fuel ratio according to the nonlinear mapping relation among the standard methanol volume value, the standard methanol pressure value and the standard methanol temperature value corresponding to each preset standard methanol fuel ratio, and further constructs a fuel ratio correction coefficient table based on each standard methanol fuel ratio and each standard correction coefficient, thereby achieving the purpose of correcting the corresponding ratio of the methanol fuel in the mixed fuel based on the fuel ratio correction coefficient table when the air charge corresponding to the mixed fuel is calculated by the air flow calculation model.
Further, based on the first and/or second embodiments of the air charge calculation method of the present application described above, preferred embodiments of the air charge calculation method of the present application are presented herein.
Referring to fig. 6, fig. 6 is a flow chart of a preferred embodiment of the air charge calculation method according to the present application, as shown in fig. 6, in this embodiment, the ECU first invokes the temperature sensor to detect the cylinder in the engine, thereby determining the real-time air temperature T (i.e. reference numeral 10 in fig. 6) corresponding to the fresh air in the cylinder, and adds 273 to the real-time air temperature T to convert it into the corresponding thermodynamic temperature T br The ECU further controls the thermodynamic temperature T br Divided by 0 degrees celsius to the corresponding thermodynamic temperature T 0 Thereby obtaining
At the same time, the ECU calls the detection unit to detect the methanol engine, so as to obtain the valve overlap angle value corresponding to the methanol engine (namely, the reference number in FIG. 68) And engine speed (i.e., reference numeral 7 in fig. 6), and obtain an air flow correction table 2-DT (u) preset by a technician, and the ECU further queries the air flow correction table 2-DT (u) based on the valve overlap angle value and the engine speed to obtain a corresponding damping coefficient
Meanwhile, the ECU calls a detection unit to detect the mixed fuel injected by the methanol engine so as to determine an initial fuel ratio corresponding to the methanol fuel in the mixed fuel, obtains a fuel ratio correction coefficient table 1-DT (u) stored in advance by a technician, and further inquires the fuel ratio correction coefficient table 1-DT (u) based on the initial fuel ratio so as to correct the initial fuel ratio to obtain a corresponding target methanol fuel ratio;
The ECU then obtains the thermodynamic temperature valueDamping coefficient->The target methanol fuel ratio is input into a preset air flow calculation model together, and the air flow calculation model is based on the thermodynamic temperature value +.>The damping coefficient->And the target methanol fuel ratio is calculated to obtain the pressure charge conversion coefficient in the cylinder as +.>
Then, the ECU calls a pressure sensor to detect the cylinder so as to acquire absolute pressure values corresponding to all gases in the cylinder, a counter-gas pressure value corresponding to the gases in the air inlet manifold and a cylinder exhaust gas pressure value corresponding to the exhaust gas generated in the cylinder, the ECU further subtracts an air partial pressure value Pbr (and a reference numeral 9 in fig. 6) corresponding to fresh air in the cylinder from the absolute pressure value and inputs the air partial pressure value Pbr into an air flow calculation model;
finally, the air flow calculation model converts the air partial pressure Pbr and the pressure charge conversion coefficient intoMultiplying to obtain the corresponding air charge of the mixed fuel>The ECU then follows the air chargeThe methanol engine is conditioned to draw in fresh air in accordance with the air charge rl.
In addition, in order to achieve the above objective, the present application further provides an air charge computing device, referring to fig. 7, fig. 7 is a schematic functional block diagram of an embodiment of the air charge computing device according to the present application, as shown in fig. 7, where the device includes:
the system comprises a duty ratio detection module 10, a fuel control module and a fuel control module, wherein the duty ratio detection module is used for determining an initial fuel duty ratio corresponding to methanol fuel, wherein the initial fuel duty ratio is the percentage of the methanol fuel in mixed fuel;
a coefficient correction module 20, configured to obtain a fuel ratio correction coefficient table, and correct the initial fuel ratio based on the fuel ratio correction coefficient table to determine a target methanol fuel ratio;
a first calculation module 30, configured to calculate an air flow coefficient corresponding to air, and obtain a pressure charge conversion coefficient in the cylinder according to the air flow coefficient and the target methanol fuel ratio;
the second calculation module 40 is configured to calculate a value of an air partial pressure in the cylinder, and calculate an air charge corresponding to the air in the mixed fuel according to the pressure charge conversion coefficient and the air partial pressure value.
Further, the first calculation module 30 includes:
The parameter detection unit is used for acquiring a real-time temperature value corresponding to air and acquiring an engine cylinder parameter corresponding to the methanol engine;
and the first coefficient query unit is used for calculating the air flow coefficient corresponding to the air based on the real-time temperature value, the engine cylinder parameter and a preset air flow correction table.
Further, the first coefficient query unit includes:
the coefficient inquiry subunit is used for converting the real-time temperature value into a thermodynamic temperature value and obtaining a damping coefficient corresponding to the air according to the engine cylinder parameter and a preset air flow correction table;
and the coefficient calculating subunit is used for calculating the thermodynamic temperature value and the damping coefficient to obtain the air flow coefficient corresponding to the air.
Further, the engine cylinder parameter includes a valve overlap angle value and an engine speed value, and the first coefficient query unit further includes:
a first comparison subunit configured to query a preset air flow correction table based on the valve overlap angle value, so as to determine a target valve overlap angle consistent with the valve overlap angle value from among the standard valve overlap angles included in the air flow correction table;
A second comparison subunit configured to query the air flow correction table based on the engine speed value, to determine a target engine speed that coincides with the engine speed value among the standard engine speeds included in the air flow correction table;
and a third comparison subunit configured to determine, from among the standard coefficients included in the air flow correction table, a target coefficient corresponding to the target valve overlap angle and the target engine speed, and determine the target coefficient as a damping coefficient corresponding to the air.
Further, the coefficient correction module 20 includes:
a table query unit configured to query the fuel ratio correction coefficient table based on the initial fuel ratio to determine the standard methanol fuel ratio corresponding to the initial fuel ratio as a target fuel ratio;
and the fuel ratio correction unit is used for determining the corrected methanol fuel ratio corresponding to the target fuel ratio as a target methanol fuel ratio.
Further, the second calculation module 40 includes:
a pressure detection unit for determining an absolute pressure value in the cylinder, and a counter-gas pressure value in the cylinder, and a cylinder exhaust gas pressure value in the cylinder;
And the partial pressure calculation unit is used for calculating the air partial pressure value in the cylinder based on the absolute pressure value, the back air pressure value and the cylinder exhaust gas pressure value.
Further, the coefficient correction module 20 further includes:
the first standard data acquisition unit is used for acquiring preset standard mixed fuel values and determining the standard methanol fuel ratio corresponding to each standard mixed fuel value;
the second standard data acquisition unit is used for determining a standard methanol volume value, a standard methanol pressure value and a standard methanol temperature value which are respectively corresponding to the standard methanol fuel ratio;
the corrected value generation unit is used for determining nonlinear mapping relations among the standard methanol volume values, the standard methanol pressure values and the standard methanol temperature values, and determining corrected methanol fuel occupation ratios corresponding to the standard methanol fuel occupation ratios based on the nonlinear mapping relations;
and a table construction unit for constructing a fuel ratio correction coefficient table based on each of the standard methanol fuel ratios and each of the corrected methanol fuel ratios.
The application further provides a terminal device, which is provided with an air charge calculation program capable of running on a processor, and the terminal device realizes the steps of the air charge calculation method according to any one of the embodiments when executing the air charge calculation program.
The specific embodiment of the terminal device of the present application is substantially the same as the embodiments of the method for calculating an air charge described above, and will not be described herein.
Furthermore, the present application provides a computer readable storage medium having stored thereon an air charge calculation program which, when executed by a processor, implements the steps of the air charge calculation method according to any of the embodiments above.
Embodiments of the computer readable storage medium are substantially the same as the embodiments of the method for calculating an air charge described above, and are not described herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present application.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the application, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. A method of calculating an air charge, wherein the method of calculating an air charge is applied to a methanol engine having a cylinder therein, the method of calculating an air charge comprising the steps of:
determining an initial fuel ratio corresponding to the methanol fuel, wherein the initial fuel ratio is the percentage of the methanol fuel in the mixed fuel;
acquiring a fuel ratio correction coefficient table, and correcting the initial fuel ratio based on the fuel ratio correction coefficient table to determine a target methanol fuel ratio;
calculating an air flow coefficient corresponding to air, and obtaining a pressure charge conversion coefficient in the cylinder according to the air flow coefficient and the target methanol fuel ratio;
and calculating the air partial pressure value in the cylinder, and calculating the air charge corresponding to the air in the mixed fuel according to the pressure charge conversion coefficient and the air partial pressure value.
2. The method of calculating an air charge according to claim 1, wherein said step of calculating an air flow coefficient corresponding to air comprises:
acquiring a real-time temperature value corresponding to air and acquiring an engine cylinder parameter corresponding to the methanol engine;
And calculating an air flow coefficient corresponding to the air based on the real-time temperature value, the engine cylinder parameter and a preset air flow correction table.
3. The method of claim 2, wherein said calculating an air flow coefficient corresponding to said air based on said real-time temperature value, said engine cylinder parameter, and a preset air flow correction table comprises:
converting the real-time temperature value into a thermodynamic temperature value, and obtaining a damping coefficient corresponding to the air according to the engine cylinder parameters and a preset air flow correction table;
and calculating the thermodynamic temperature value and the damping coefficient to obtain the air flow coefficient corresponding to the air.
4. A method of calculating an air charge as set forth in claim 3 wherein said engine cylinder parameters include valve overlap angle values and engine speed values, said step of deriving said air corresponding damping coefficient from said engine cylinder parameters and a predetermined air flow correction table comprising:
inquiring a preset air flow correction table based on the valve overlap angle value to determine a target valve overlap angle consistent with the valve overlap angle value in each standard valve overlap angle contained in the air flow correction table;
Querying the air flow correction table based on the engine speed value to determine a target engine speed that is consistent with the engine speed value among the standard engine speeds contained in the air flow correction table;
among the standard coefficients included in the air flow correction table, a target coefficient corresponding to the target valve overlap angle and the target engine speed is determined, and the target coefficient is determined as a damping coefficient corresponding to the air.
5. The air charge calculation method of claim 1 wherein said fuel ratio correction factor table includes a respective standard methanol fuel ratio and a corrected methanol fuel ratio corresponding to each of said standard methanol fuel ratios;
the step of acquiring a fuel ratio correction factor table and correcting the initial fuel ratio based on the fuel ratio correction factor table to determine a target methanol fuel ratio includes:
querying the fuel ratio correction factor table based on the initial fuel duty to determine the standard methanol fuel duty corresponding to the initial fuel duty as a target fuel duty;
and determining the corrected methanol fuel ratio corresponding to the target fuel ratio as a target methanol fuel ratio.
6. The method of calculating an air charge as set forth in claim 1 wherein said step of calculating a value of the partial pressure of air in said cylinder comprises:
determining an absolute pressure value within the cylinder, and a counter-pressure value within the cylinder, and a cylinder exhaust gas pressure value within the cylinder;
and calculating to obtain the air partial pressure value in the cylinder based on the absolute pressure value, the back air pressure value and the cylinder exhaust gas pressure value.
7. The air charge calculation method of claim 1, wherein prior to the step of obtaining a table of fuel ratio correction coefficients, the method further comprises:
acquiring preset standard mixed fuel values, and determining the standard methanol fuel ratio corresponding to each standard mixed fuel value;
determining a standard methanol volume value, a standard methanol pressure value and a standard methanol temperature value which correspond to each standard methanol fuel ratio;
determining nonlinear mapping relations among the standard methanol volume values, the standard methanol pressure values and the standard methanol temperature values, and determining corrected methanol fuel ratios corresponding to the standard methanol fuel ratios based on the nonlinear mapping relations;
And constructing a fuel ratio correction coefficient table based on each of the standard methanol fuel ratios and each of the corrected methanol fuel ratios.
8. An air charge calculation device for use with a methanol engine having a cylinder therein, the device comprising:
the system comprises a duty ratio detection module, a fuel injection module and a fuel injection module, wherein the duty ratio detection module is used for determining an initial fuel duty ratio corresponding to methanol fuel, and the initial fuel duty ratio is the percentage of the methanol fuel in mixed fuel;
the coefficient correction module is used for acquiring a fuel ratio correction coefficient table and correcting the initial fuel ratio based on the fuel ratio correction coefficient table to determine a target methanol fuel ratio;
the first calculation module is used for calculating an air flow coefficient corresponding to air and obtaining a pressure charge conversion coefficient in the cylinder according to the air flow coefficient and the target methanol fuel ratio;
and the second calculation module is used for calculating the air partial pressure value in the cylinder and calculating the air charge corresponding to the air in the mixed fuel according to the pressure charge conversion coefficient and the air partial pressure value.
9. A terminal device, characterized in that the terminal device comprises: memory, a processor, on which there is stored an air charge calculation program executable on the processor, which when executed by the processor implements the steps of the air charge calculation method according to any one of claims 1 to 7.
10. A computer readable storage medium, characterized in that it has stored thereon a calculation program of an air charge, which, when executed by a processor, implements the steps of the method of calculating an air charge according to any one of claims 1 to 7.
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