CN116591837A - Engine control method, device, equipment and computer readable storage medium - Google Patents
Engine control method, device, equipment and computer readable storage medium Download PDFInfo
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- CN116591837A CN116591837A CN202310780093.3A CN202310780093A CN116591837A CN 116591837 A CN116591837 A CN 116591837A CN 202310780093 A CN202310780093 A CN 202310780093A CN 116591837 A CN116591837 A CN 116591837A
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- 238000000034 method Methods 0.000 title claims abstract description 64
- 239000000446 fuel Substances 0.000 claims abstract description 238
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 165
- 239000003054 catalyst Substances 0.000 claims abstract description 40
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 39
- 238000002347 injection Methods 0.000 claims description 37
- 239000007924 injection Substances 0.000 claims description 37
- 239000007788 liquid Substances 0.000 claims description 13
- 238000012544 monitoring process Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 16
- 239000007789 gas Substances 0.000 abstract description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 12
- 238000002485 combustion reaction Methods 0.000 description 12
- 239000001301 oxygen Substances 0.000 description 12
- 229910052760 oxygen Inorganic materials 0.000 description 12
- 238000004891 communication Methods 0.000 description 8
- 230000003044 adaptive effect Effects 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001868 water Inorganic materials 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0611—Fuel type, fuel composition or fuel quality
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0806—NOx storage amount, i.e. amount of NOx stored on NOx trap
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1002—Output torque
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/36—Control for minimising NOx emissions
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention relates to the technical field of automobile control, in particular to an engine control method, an engine control device, engine control equipment and a computer readable storage medium, wherein the engine control method comprises the following steps: acquiring the concentration of nitrogen oxides in a primary row of an engine at least once through a NOx sensor arranged at the upstream of a three-way catalyst, and acquiring the engine torque corresponding to the concentration of the nitrogen oxides; determining a fuel quality coefficient from a preset ignition control map based on the NOx concentration and the engine torque; if the fuel quality coefficient is within the first preset range, the intake pressure of the engine is controlled based on the fuel quality coefficient. The invention realizes that the fuel quality in the engine is detected before the air inlet pressure control is carried out on the engine, and the air inlet pressure of the engine is controlled based on the fuel quality when the fuel quality is normal, so that the interference of the fuel quality on the air inlet pressure is considered in the process of controlling the air inlet pressure, the accuracy of controlling the air inlet pressure of the engine is improved, and the pollution of the tail gas of the engine is reduced.
Description
Technical Field
The present invention relates to the field of automobile control technologies, and in particular, to an engine control method, an engine control device, an engine control apparatus, and a computer readable storage medium.
Background
In the running process of the vehicle, the vehicle controls the air inlet pressure of the engine so as to control the air inlet amount of the fuel combustion process of the engine, thereby controlling the products of the fuel combustion of the engine and reducing the amount of pollutants in the tail gas of the engine as much as possible. If the oxygen concentration in the tail gas of the engine is too high, the air inflow of the engine is larger, the pollutants are increased due to incomplete combustion of fuel, the air inflow of the engine should be reduced, similarly, the pollutants are increased due to incomplete combustion of fuel due to too low oxygen concentration, and the air inflow of the engine should be increased.
However, when the control is performed in the above control manner, if the oxygen concentration is changed due to the quality of the fuel, the adjustment of the injection pressure of the fuel and the intake air amount according to the oxygen concentration is inaccurate, and incomplete fuel combustion may still occur, so that the pollutants in the exhaust gas may increase.
Disclosure of Invention
The invention mainly aims to provide an engine control method, device, equipment and computer readable storage medium, and aims to provide a method for controlling an engine based on fuel substances, which improves the control accuracy of controlling the air inlet pressure of the engine so as to reduce the pollution of tail gas of the engine.
In order to achieve the above object, the present invention provides an engine control method comprising:
acquiring the concentration of nitrogen oxides in a primary row of an engine at least once through a NOx sensor arranged at the upstream of a three-way catalyst, and acquiring the engine torque corresponding to the concentration of the nitrogen oxides;
determining a fuel quality coefficient from a preset ignition control map based on the nox concentration and the engine torque;
and if the fuel quality coefficient is within a first preset range, controlling the air inlet pressure of the engine based on the fuel quality coefficient.
Optionally, before the step of acquiring the concentration of nitrogen oxides in the original row of the engine by using a NOx sensor installed upstream of the three-way catalyst, the method further comprises:
detecting whether the operation condition of an engine reaches a preset condition, wherein the preset condition is a condition point that the difference value between fuel quality coefficients of different quality fuels exceeds a preset value;
and if the operation condition reaches the preset condition, executing the step of acquiring the concentration of nitrogen oxides in the original row of the engine through a NOx sensor arranged at the upstream of the three-way catalyst.
Optionally, if the operating condition reaches the preset operating condition, the step of executing the step of acquiring the concentration of the nitrogen oxides in the original row of the engine through the NOx sensor installed at the upstream of the three-way catalyst includes:
if the engine reaches the preset working condition, detecting whether the running time of the engine under the running working condition reaches a first preset time;
and if the operation time length reaches the first preset time length, executing the step of acquiring the concentration of nitrogen oxides in the original row of the engine through a NOx sensor arranged at the upstream of the three-way catalyst.
Optionally, before the step of detecting whether the operation condition of the engine reaches the preset condition, the method further includes:
detecting whether new fuel is injected into the engine;
if new fuel is injected into the engine, the step of acquiring the concentration of nitrogen oxides in the original row of the engine at least once through a NOx sensor arranged at the upstream of the three-way catalyst is executed.
Optionally, the engine control method further includes:
monitoring a fuel level in the engine;
the step of detecting whether new fuel is injected into the engine includes:
detecting whether the fuel liquid level meets a preset condition, wherein the preset condition is that a change value of the fuel liquid level in a second preset time period exceeds a second preset range;
if the fuel level meets the preset condition, determining that new fuel is injected into the engine;
and if the fuel level does not meet the preset condition, determining that new fuel is not injected into the engine.
Optionally, when the nox concentration is obtained at least twice, the step of determining the fuel quality coefficient from a preset ignition control map based on the nox concentration and the engine torque includes:
determining a plurality of control coefficients from a preset ignition control map based on each of the nox concentrations and the corresponding engine torque, respectively;
and calculating a fuel quality coefficient based on a plurality of control coefficients.
Optionally, the step of controlling the intake pressure of the engine includes:
multiplying the fuel quality coefficient by the adding time of the engine to obtain the actual oil injection time;
and controlling the air inlet pressure of the engine based on the actual oil injection duration, wherein the longer the actual oil injection duration is, the larger the air inlet pressure is.
In addition, in order to achieve the above object, the present invention also provides an engine control apparatus comprising:
the acquisition module is used for acquiring the concentration of nitrogen oxides in the original row of the engine at least once through a NOx sensor arranged at the upstream of the three-way catalyst, and acquiring the engine torque corresponding to the concentration of the nitrogen oxides;
the determining module is used for determining a fuel quality coefficient from a preset ignition control chart based on the nitrogen oxide concentration and the engine torque;
and the control module is used for controlling the air inlet pressure of the engine based on the fuel quality coefficient if the fuel quality coefficient is in a first preset range.
In addition, in order to achieve the above object, the present invention also provides an engine control apparatus including a memory, a processor, and an engine control program stored on the memory and operable on the processor, the engine control program implementing the steps of the engine control method described above when executed by the processor.
In addition, in order to achieve the above object, the present invention also provides a computer-readable storage medium having stored thereon an engine control program which, when executed by a processor, implements the steps of the engine control method described above.
In the invention, the concentration of nitrogen oxides in the original row of the engine is obtained at least once through a NOx sensor arranged at the upstream of a three-way catalyst, and the engine torque corresponding to the concentration of the nitrogen oxides is obtained; determining a fuel quality coefficient from a preset ignition control map based on the NOx concentration and the engine torque; if the fuel quality coefficient is within the first preset range, determining that the fuel quality is normal, and controlling the air inlet pressure of the engine. The invention realizes that the fuel quality in the engine is detected before the air inlet pressure control is carried out on the engine, and the air inlet pressure of the engine is controlled based on the fuel quality when the fuel quality is normal, so that the interference of the fuel quality on the air inlet pressure is considered in the process of controlling the air inlet pressure, the accuracy of controlling the air inlet pressure of the engine is improved, and the pollution of the tail gas of the engine is reduced.
Drawings
FIG. 1 is a schematic diagram of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a flow chart of a first embodiment of an engine control method according to the present invention;
FIG. 3 is a flow chart of an engine control method according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of an embodiment of an engine control method according to the present invention.
The achievement of the objects, functional features and advantages of the present invention 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 invention.
Referring to fig. 1, fig. 1 is a schematic device structure of a hardware running environment according to an embodiment of the present invention.
It should be noted that, in the engine control device according to the embodiment of the present invention, the engine control device may be a whole vehicle controller, or may be a device that establishes communication connection with the whole vehicle controller, for example, a computer, a server, etc., which is not limited herein.
As shown in fig. 1, the engine control apparatus may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. 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., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), 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 arrangement of the apparatus shown in fig. 1 is not limiting of the engine control apparatus and may include more or fewer components than shown, or certain components may be combined, or a different arrangement of components.
As shown in fig. 1, an operating system, a network communication module, a user interface module, and an engine control program may be included in the memory 1005, which is a type of computer storage medium. An operating system is a program that manages and controls the hardware and software resources of the device, supporting the execution of engine control programs, as well as other software or programs. In the device shown in fig. 1, the user interface 1003 is mainly used for data communication with the client; the network interface 1004 is mainly used for establishing communication connection with a server; and the processor 1001 may be configured to call an engine control program stored in the memory 1005 and perform the following operations:
acquiring the concentration of nitrogen oxides in a primary row of an engine at least once through a NOx sensor arranged at the upstream of a three-way catalyst, and acquiring the engine torque corresponding to the concentration of the nitrogen oxides;
determining a fuel quality coefficient from a preset ignition control map based on the nox concentration and the engine torque;
and if the fuel quality coefficient is within a first preset range, controlling the air inlet pressure of the engine based on the fuel quality coefficient.
Further, before the step of acquiring the concentration of nitrogen oxides in the primary row of the engine by the NOx sensor installed upstream of the three-way catalyst, the method further comprises:
detecting whether the operation condition of an engine reaches a preset condition, wherein the preset condition is a condition point that the difference value between fuel quality coefficients of different quality fuels exceeds a preset value;
and if the operation condition reaches the preset condition, executing the step of acquiring the concentration of nitrogen oxides in the original row of the engine through a NOx sensor arranged at the upstream of the three-way catalyst.
Further, if the operating condition reaches the preset operating condition, the step of executing the step of acquiring the concentration of the nitrogen oxides in the original row of the engine through the NOx sensor installed at the upstream of the three-way catalyst includes:
if the engine reaches the preset working condition, detecting whether the running time of the engine under the running working condition reaches a first preset time;
and if the operation time length reaches the first preset time length, executing the step of acquiring the concentration of nitrogen oxides in the original row of the engine through a NOx sensor arranged at the upstream of the three-way catalyst.
Further, before the step of detecting whether the operation condition of the engine reaches the preset condition, the method further includes:
detecting whether new fuel is injected into the engine;
if new fuel is injected into the engine, the step of acquiring the concentration of nitrogen oxides in the original row of the engine at least once through a NOx sensor arranged at the upstream of the three-way catalyst is executed.
Further, the engine control method further includes:
monitoring a fuel level in the engine;
the step of detecting whether new fuel is injected into the engine includes:
detecting whether the fuel liquid level meets a preset condition, wherein the preset condition is that a change value of the fuel liquid level in a second preset time period exceeds a second preset range;
if the fuel level meets the preset condition, determining that new fuel is injected into the engine;
and if the fuel level does not meet the preset condition, determining that new fuel is not injected into the engine.
Further, when the nox concentration is acquired at least twice, the step of determining the fuel quality coefficient from a preset ignition control map based on the nox concentration and the engine torque includes:
determining a plurality of control coefficients from a preset ignition control map based on each of the nox concentrations and the corresponding engine torque, respectively;
and calculating a fuel quality coefficient based on a plurality of control coefficients.
Further, the step of controlling the intake air pressure of the engine includes:
multiplying the fuel quality coefficient by the adding time of the engine to obtain the actual oil injection time;
and controlling the air inlet pressure of the engine based on the actual oil injection duration, wherein the longer the actual oil injection duration is, the larger the air inlet pressure is.
Based on the above-described structure, various embodiments of an engine control method are presented.
Referring to fig. 2, fig. 2 is a flowchart illustrating a first embodiment of an engine control method according to the present invention.
Embodiments of the present invention provide embodiments of engine control methods, it being noted that although a logic sequence is shown in the flow chart, in some cases the steps shown or described may be performed in a different order than that shown or described herein. In this embodiment, the engine control method may be a whole vehicle controller, or a device that establishes communication connection with the whole vehicle controller, for example, a computer, a server, or other devices, where in this embodiment, the engine control method includes:
step S10, acquiring the concentration of nitrogen oxides in an original row of an engine at least once through a NOx sensor arranged at the upstream of a three-way catalyst, and acquiring the engine torque corresponding to the concentration of the nitrogen oxides;
the current self-adaptive control process of the air inlet pressure of the engine comprises the following steps: an oxygen sensor is used to measure the oxygen concentration of the exhaust gas, the fuel injection pressure of the engine is determined based on the oxygen concentration, thereby determining the engine intake pressure, and the engine intake is controlled based on the determined intake pressure.
If there is a problem in the fuel components of the engine, such as aging of the nozzle, the fuel quantity ejected from the nozzle decreases, and the oxygen concentration in the exhaust gas increases, and at this time, based on the above control process, the fuel injection pressure and the intake pressure of the engine are increased, so that the fuel can be completely combusted, and pollution of the exhaust gas is reduced. However, if there is a problem in that the fuel quality is changed, for example, the fuel calorific value is lowered, incomplete combustion of the fuel is still caused even if the fuel pressure is not abnormal, and thus an increase in oxygen concentration occurs, and at this time, the fuel injection pressure of the engine is still increased based on the above control process, but since the fuel quality is problematic, the amount of intake air required for complete combustion of the fuel has been changed, that is, the correlation between the injection pressure and the intake air pressure has been changed, and if the fuel injection pressure of the transmitter is still controlled in accordance with the previous fuel quality, incomplete combustion of the fuel may still occur.
Therefore, the present embodiment proposes a method of controlling the intake pressure of an engine based on the fuel quality, by detecting the fuel quality before controlling the intake pressure, to achieve accurate control of the intake pressure of the engine. Specifically, the fuel quality in this embodiment may specifically refer to the calorific value of the fuel, the content of impurities in the fuel, or other indexes related to the fuel quality, and is not limited herein.
In this embodiment, the exhaust gas emitted from the engine upstream of the three-way catalyst is referred to as the original exhaust gas of the engine. The combustion caused by the problems of engine parts (such as nozzle aging, nozzle consistency and the like) is incomplete, the combustion is incomplete due to the fact that the concentration of NOx in the original row of the engine is different under the two conditions, the combustion caused by the problems of engine parts is not completely caused by the fact that the concentration of NOx in the original row under the same working condition is not changed due to the fact that the amount of fuel is not matched with the amount of air, and the concentration of NOx in the original row is increased due to the fact that the incomplete combustion caused by the fuel quality is caused by the fact that the concentration of NOx in the original row is increased. Since the three-way catalyst converts harmful gases such as CO, HC, NOx and the like in the original row into harmless carbon dioxide, water and nitrogen through oxidation and reduction, in this embodiment, the original row NOx concentration of the engine upstream of the three-way catalyst is obtained, specifically, may be obtained by a NOx sensor installed upstream of the three-way catalyst. In the specific detection process, the NOx concentration can be acquired for multiple times, and the fuel quality coefficient is determined based on the multiple NOx concentrations so as to improve the accuracy of the fuel quality coefficient; the primary NOx concentration may be obtained, and the fuel quality factor may be determined based on one NOx concentration to reduce the number of detection steps and improve the detection efficiency, without limitation.
In this embodiment, the engine torque corresponding to the nox concentration is also obtained, that is, the nox concentration and the engine torque at the same time are obtained. The specific manner of acquiring the torque is not limited herein, and in one possible embodiment, for example, the time at which the concentration of the nitrogen oxide is acquired may be determined, and the engine torque at the time is determined from the vehicle operation data according to the time; in another possible embodiment, it may also be that a vehicle operating condition is determined in which the concentration of nitrogen oxides is obtained, and the engine torque is determined according to the operating condition.
Step S20, determining a fuel quality coefficient from a preset ignition control chart based on the nitrogen oxide concentration and the engine torque;
in this embodiment, a MAP (ignition control curve) MAP having the nox concentration and the engine torque as independent variables and the fuel quality coefficient as a dependent variable is preset, and is hereinafter referred to as an ignition control MAP for convenience of description. The preset ignition control chart can be obtained by testing on a bench in a single variable experiment mode by using fuels with different qualities, and the specific testing process is not described herein.
A fuel quality coefficient is determined from a preset ignition control map based on the NOx concentration and the engine torque.
Further, in a possible embodiment, when the fuel quality refers to the fuel heating value, the preset ignition control map may also be based on the fuel heating value, that is, based on the nox concentration and the engine torque, the fuel heating value is determined from the preset ignition control map; and then determining the quality coefficient according to the mapping relation between the fuel heat value and the quality coefficient, wherein the quality coefficient is higher as the fuel heat value is higher.
Step S30, if the fuel quality coefficient is within a first preset range, controlling the intake pressure of the engine based on the fuel quality coefficient.
In the present embodiment, after determining the fuel quality coefficient, it is detected whether the fuel quality coefficient is within a preset reasonable range (hereinafter referred to as a first preset range to show distinction). If the fuel quality coefficient is within the first preset range, the fuel quality is determined to be within a reasonable range, and the fuel can be used for engine operation. At this time, the intake pressure of the engine is controlled based on the fuel quality coefficient in consideration of the influence of the fuel quality variation on the engine intake pressure so that the current intake pressure is determined based on the fuel quality of the current engine fuel, improving the accuracy of the intake pressure control.
Further, in one possible embodiment, if the fuel quality coefficient is within the first preset range, an overrun fault of the fuel quality coefficient is reported, and the user is prompted to check the fuel quality.
In the embodiment, the concentration of nitrogen oxides in the original row of the engine is obtained at least once through a NOx sensor arranged at the upstream of the three-way catalyst, and the engine torque corresponding to the concentration of the nitrogen oxides is obtained; determining a fuel quality coefficient from a preset ignition control map based on the NOx concentration and the engine torque; if the fuel quality coefficient is within the first preset range, determining that the fuel quality is normal, and controlling the air inlet pressure of the engine. The embodiment realizes that the fuel quality in the engine is detected before the air inlet pressure control is carried out on the engine, and the air inlet pressure of the engine is controlled based on the fuel quality when the fuel quality is normal, so that the interference of the fuel quality on the air inlet pressure is considered in the air inlet pressure control process, the accuracy of controlling the air inlet pressure of the engine is improved, and the pollution of the tail gas of the engine is reduced.
Further, based on the first embodiment, a first embodiment of the engine control method according to the present invention is provided, and in this embodiment, before the step S10, the method further includes:
step S40, detecting whether the operation condition of the engine reaches a preset condition, wherein the preset condition is a condition point that the difference value between fuel quality coefficients of different quality fuels exceeds a preset value;
in the present embodiment, the operation condition (hereinafter, referred to as a preset condition to show distinction) in which the fuel quality coefficient is determined is set in advance. In an exemplary embodiment, the preset working condition may be determined according to an ignition control chart, specifically, a working condition point corresponding to a torque where a difference between fuel quality coefficients of different quality fuels exceeds a preset value is selected as the preset working condition, or the preset working condition may be set according to an actual requirement, which is not limited herein.
And detecting whether the running condition of the engine reaches a preset condition. In a possible implementation manner, whether the operation condition reaches the preset condition is determined according to the torque comparison result, and when the operation torque of the engine is the same as the torque of the preset condition, the operation condition is determined to reach the preset condition; in another possible implementation manner, whether the operation condition reaches the preset condition or not can also be determined according to the rotation speed of the engine, and the specific determination mode is the same as the torque.
And step S50, if the operation condition reaches the preset condition, executing the step of acquiring the concentration of nitrogen oxides in the original row of the engine through a NOx sensor arranged at the upstream of the three-way catalyst.
In this embodiment, if the operating condition reaches the preset condition, it is determined that the engine is under the condition that the difference of the fuel quality coefficients is obvious, and then a more accurate fuel quality coefficient can be obtained, so that the step of acquiring the concentration of nitrogen oxides in the original line of the engine through the NOx sensor installed upstream of the three-way catalyst is performed to determine the fuel quality coefficient.
Further, in a possible embodiment, the step S50 includes:
step S501, if the engine reaches the preset working condition, detecting whether the running duration of the engine under the running working condition reaches a first preset duration;
in this embodiment, if the engine reaches the preset working condition, it is detected whether the running duration of the engine under the running working condition reaches the first preset duration, so as to determine whether the vehicle is running stably.
Step S502, if the operation duration reaches the first preset duration, executing the step of acquiring the concentration of nitrogen oxides in the original row of the engine through a NOx sensor installed at the upstream of the three-way catalyst.
If the operation duration reaches the first preset duration, the vehicle is determined to be stably operated, and at this time, a fuel quality coefficient may be determined to control the intake pressure, and the step of acquiring the concentration of nitrogen oxides in the original row of the engine through a NOx sensor installed upstream of the three-way catalyst is performed.
Further, in a possible implementation manner, if the operation duration does not reach the first preset duration, the intake pressure may be adjusted according to the adaptive coefficient corresponding to the oxygen concentration, so as to reduce the engine exhaust pollution.
Further, in a possible embodiment, before the step S40, the method further includes:
step S60, detecting whether new fuel is injected into the engine;
in the present embodiment, it is possible to detect whether new fuel is injected into the engine before determining the fuel quality coefficient and adjusting the intake pressure according to the fuel quality coefficient.
Step S70, if new fuel is injected into the engine, the step of acquiring the concentration of nitrogen oxides in the original row of the engine at least once through a NOx sensor arranged at the upstream of the three-way catalyst is executed.
If new fuel is injected into the engine, it is necessary to re-determine the fuel quality coefficient so as to improve the accuracy of controlling the intake air pressure, and the step of acquiring the concentration of nitrogen oxides in the original line of the engine at least once by a NOx sensor installed upstream of the three-way catalyst is performed.
Further, in one possible embodiment, if no new fuel is injected into the engine, the intake pressure may be adjusted according to the previous fuel quality coefficient; the intake pressure may be adjusted according to an adaptive coefficient corresponding to the oxygen concentration.
Further, in a possible embodiment, the engine control method further includes:
step S80, monitoring a fuel level in the engine;
in this embodiment, the fuel level in the engine is monitored to determine whether new fuel is injected into the engine.
In this embodiment, the step S60 includes:
step S601, detecting whether the fuel level meets a preset condition, where the preset condition is that a variation value of the fuel level within a second preset duration exceeds a second preset range;
in this embodiment, preset conditions for characterizing new fuel injection are preset, where the preset conditions are that a variation value of the fuel level in the second preset duration exceeds a second preset range. That is, the preset condition characterizes a substantial increase in engine fuel (i.e., a second preset range) over a second preset duration. Further, in a possible embodiment, the preset condition may further limit the liquid level before the change of the fuel liquid level (hereinafter referred to as the reference liquid level to show distinction) to be lower than the preset liquid level, and the preset liquid level may be set according to actual requirements. In this embodiment, it is detected whether the fuel level satisfies a preset condition.
Step S602, if the fuel level meets the preset condition, determining that new fuel is injected into the engine;
if the fuel level meets the preset condition, determining that the fuel of the engine is greatly increased within the second preset duration (namely, the second preset range), and determining that new fuel is injected into the engine.
Step S603, if the fuel level does not meet the preset condition, determining that no new fuel is injected into the engine.
If the fuel level does not meet the preset condition, it is determined that the engine fuel has not been increased substantially (i.e., within the second preset range) within the second preset time period, that the new fuel is injected into the engine a plurality of times, that the engine has only been injected with a small amount of new fuel, that the new fuel is not injected into the engine, and that in the present embodiment, all of the above possible cases are regarded as not being injected with new fuel into the engine.
In the embodiment, whether the operation condition of the engine reaches a preset condition is detected, wherein the preset condition is a condition point that the difference value between the fuel quality coefficients of different quality fuels exceeds a preset value; and if the operation condition reaches the preset condition, executing the step of acquiring the concentration of nitrogen oxides in the original row of the engine through a NOx sensor arranged at the upstream of the three-way catalyst. According to the embodiment, a more accurate fuel quality coefficient can be obtained, so that the accuracy of controlling the air inlet pressure is improved, and the pollution of automobile exhaust is reduced.
Further, based on the above first and/or second embodiments, a third embodiment of the engine control method of the present invention is provided, in this embodiment, when the concentration of nitrogen oxides is obtained at least twice, the step S20 includes:
step S201, determining a plurality of control coefficients from a preset ignition control chart based on the concentration of each nitrogen oxide and the corresponding engine torque respectively;
in the present embodiment, a plurality of fuel quality coefficients (hereinafter referred to as control coefficients to show differentiation) are determined from a preset ignition control map based on the respective nox concentrations and the corresponding engine torques, respectively.
Step S202, calculating a fuel quality coefficient based on a plurality of control coefficients.
A fuel quality coefficient is calculated based on the plurality of control coefficients.
In a specific embodiment, an average value of a plurality of control coefficients may be taken as a fuel quality coefficient; the average value of the plurality of control coefficients may be taken as the fuel quality coefficient, and the fuel quality coefficient is not limited herein and may be set according to actual requirements.
Further, in a possible embodiment, the step S30 includes:
step S301, multiplying the fuel quality coefficient by the adding time length of the engine to obtain the actual oil injection time length;
the actual fuel injection time is obtained by multiplying the fuel quality coefficient by the adding time of the engine (namely, the time of injecting the fuel by the nozzle), and the injection quantity of the fuel is controlled by controlling the fuel injection time.
And step S302, controlling the air inlet pressure of the engine based on the actual oil injection duration, wherein the longer the actual oil injection duration is, the larger the air inlet pressure is.
For the same engine, the injection pressure is maintained at a constant value (hereinafter referred to as a preset pressure constant value to show distinction), that is, the injection pressure of the nozzle per unit time is constant, and therefore, the actual injection amount of the fuel can be determined based on the actual injection period.
And determining the actual injection quantity of the fuel based on the actual injection time length, and determining the required air quantity according to the actual injection quantity, so as to obtain the air inlet pressure of the engine, and controlling the air inlet pressure of the engine, wherein the longer the actual injection time length is, the more the required air quantity is, and the greater the air inlet pressure is.
Further, in one possible embodiment, the adaptive coefficient of the fuel injection pressure may also be determined based on the oxygen concentration; calculating the product of the self-adaptive coefficient and the fuel injection coefficient to obtain an adjustment coefficient; and calculating the adding point time length by using the adjustment coefficient to obtain the actual oil injection time length. That is, in this embodiment, the influence of the engine component problem on the intake pressure is also considered, so that the accuracy of intake pressure control is further improved, and the pollution of the automobile exhaust is reduced.
In the embodiment, a plurality of control coefficients are determined from a preset ignition control map by respectively based on the respective nitrogen oxide concentrations and the corresponding engine torques; a fuel quality coefficient is calculated based on the plurality of control coefficients. According to the embodiment, the NOx concentration is acquired for a plurality of times, the fuel quality coefficient is determined based on the NOx concentrations, and the accuracy of the fuel quality coefficient can be improved, so that the accuracy of air intake control is improved.
Further, in a possible embodiment, referring to fig. 3, the control process for controlling the intake air pressure in this embodiment may be:
the engine fuel level is monitored and whether new fuel is injected into the engine is detected based on the fuel level, and further, in one possible embodiment, a new tank of fuel is considered to be added when an increase in the fuel level from the empty position to the full position is detected.
In the present embodiment, whether or not fuel adaptation calculation is completed for newly added fuel is detected, and the adaptation calculation refers to the entire process of adjusting the intake air pressure based on the fuel quality coefficient. Stopping the adaptive calculation of the tank fuel if the adaptive calculation is completed; if the adaptive calculation is not completed, the adaptive function is activated and the tank fuel is adaptively calculated.
And (3) performing self-adaptive calculation, detecting whether the operation condition of the engine reaches a preset condition, and judging whether the operation time under the condition reaches the preset time. If the operation condition reaches a preset condition and the operation time of the engine under the condition reaches a preset time, acquiring the concentration of nitrogen oxides in the original row of the engine for a plurality of times through a NOx sensor arranged at the upstream of the three-way catalyst, and acquiring the engine torque corresponding to the concentration of the nitrogen oxides; determining a plurality of control coefficients from a preset ignition control map based on the NOx concentration and the engine torque; the fuel quality coefficient is calculated based on the respective control coefficients. And if the operation condition does not reach the preset condition or the operation time of the engine under the condition does not reach the preset time, returning to detect whether the fuel self-adaptive calculation is completed for the newly added fuel.
Judging whether the fuel quality coefficient is within a preset range. If the fuel quality coefficient is within the preset range, controlling the air inlet pressure of the engine based on the fuel quality coefficient, wherein the specific correction process is to correct the oil injection quantity of the engine according to the fuel quality coefficient, so as to correct the air inlet pressure, and ensure that the torque output after correction is not changed due to the fuel quality. If the fuel quality coefficient exceeds the preset range, an overrun fault of the self-adaptive coefficient is reported, and the fuel quality is reminded to be checked.
In addition, an embodiment of the present invention further provides an engine control device, referring to fig. 4, where the engine control device includes:
an acquisition module 10 for acquiring the concentration of nitrogen oxides in an original row of an engine at least once through a NOx sensor installed upstream of a three-way catalyst, and acquiring an engine torque corresponding to the concentration of the nitrogen oxides;
a determination module 20 for determining a fuel quality factor from a preset ignition control map based on the nox concentration and the engine torque;
the control module 30 is configured to control an intake pressure of the engine based on the fuel quality coefficient if the fuel quality coefficient is within a first preset range.
Further, the engine control device further includes a detection module for:
detecting whether the operation condition of an engine reaches a preset condition, wherein the preset condition is a condition point that the difference value between fuel quality coefficients of different quality fuels exceeds a preset value;
and if the operation condition reaches the preset condition, executing the step of acquiring the concentration of nitrogen oxides in the original row of the engine through a NOx sensor arranged at the upstream of the three-way catalyst.
Further, the detection module is further configured to:
if the engine reaches the preset working condition, detecting whether the running time of the engine under the running working condition reaches a first preset time;
and if the operation time length reaches the first preset time length, executing the step of acquiring the concentration of nitrogen oxides in the original row of the engine through a NOx sensor arranged at the upstream of the three-way catalyst.
Further, the detection module is further configured to:
detecting whether new fuel is injected into the engine;
if new fuel is injected into the engine, the step of acquiring the concentration of nitrogen oxides in the original row of the engine at least once through a NOx sensor arranged at the upstream of the three-way catalyst is executed.
Further, the engine control device further includes a monitoring module for:
monitoring a fuel level in the engine;
the detection module is also used for:
detecting whether the fuel liquid level meets a preset condition, wherein the preset condition is that a change value of the fuel liquid level in a second preset time period exceeds a second preset range;
if the fuel level meets the preset condition, determining that new fuel is injected into the engine;
and if the fuel level does not meet the preset condition, determining that new fuel is not injected into the engine.
Further, the determining module 20 is further configured to:
determining a plurality of control coefficients from a preset ignition control map based on each of the nox concentrations and the corresponding engine torque, respectively;
and calculating a fuel quality coefficient based on a plurality of control coefficients.
Further, the adjustment module is further configured to:
multiplying the fuel quality coefficient by the adding time of the engine to obtain the actual oil injection time;
and controlling the air inlet pressure of the engine based on the actual oil injection duration, wherein the longer the actual oil injection duration is, the larger the air inlet pressure is.
Embodiments of the engine control device of the present invention may refer to embodiments of the engine control method of the present invention, and will not be described herein.
In addition, the embodiment of the invention also provides a computer readable storage medium, wherein the storage medium stores an engine control program, and the engine control program realizes the steps of an engine control method as described below when being executed by a processor.
Embodiments of the engine control apparatus and the computer readable storage medium of the present invention may refer to embodiments of the engine control method of the present invention, and will not be 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 invention 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 invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a computer readable storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing an engine control 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 invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, 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. An engine control method, characterized by comprising:
acquiring the concentration of nitrogen oxides in a primary row of an engine at least once through a NOx sensor arranged at the upstream of a three-way catalyst, and acquiring the engine torque corresponding to the concentration of the nitrogen oxides;
determining a fuel quality coefficient from a preset ignition control map based on the nox concentration and the engine torque;
and if the fuel quality coefficient is within a first preset range, controlling the air inlet pressure of the engine based on the fuel quality coefficient.
2. The engine control method according to claim 1, characterized by further comprising, before the step of acquiring the concentration of nitrogen oxides in the engine bank by a NOx sensor installed upstream of the three-way catalyst:
detecting whether the operation condition of an engine reaches a preset condition, wherein the preset condition is a condition point that the difference value between fuel quality coefficients of different quality fuels exceeds a preset value;
and if the operation condition reaches the preset condition, executing the step of acquiring the concentration of nitrogen oxides in the original row of the engine through a NOx sensor arranged at the upstream of the three-way catalyst.
3. The engine control method according to claim 2, characterized in that the step of performing the step of acquiring the concentration of nitrogen oxides in the engine bank through a NOx sensor installed upstream of the three-way catalyst if the operation condition reaches the preset condition comprises:
if the engine reaches the preset working condition, detecting whether the running time of the engine under the running working condition reaches a first preset time;
and if the operation time length reaches the first preset time length, executing the step of acquiring the concentration of nitrogen oxides in the original row of the engine through a NOx sensor arranged at the upstream of the three-way catalyst.
4. The engine control method according to claim 2, characterized in that before the step of detecting whether the operation condition of the engine reaches the preset condition, further comprising:
detecting whether new fuel is injected into the engine;
if new fuel is injected into the engine, the step of acquiring the concentration of nitrogen oxides in the original row of the engine at least once through a NOx sensor arranged at the upstream of the three-way catalyst is executed.
5. The engine control method according to claim 4, characterized in that the engine control method further comprises:
monitoring a fuel level in the engine;
the step of detecting whether new fuel is injected into the engine includes:
detecting whether the fuel liquid level meets a preset condition, wherein the preset condition is that a change value of the fuel liquid level in a second preset time period exceeds a second preset range;
if the fuel level meets the preset condition, determining that new fuel is injected into the engine;
and if the fuel level does not meet the preset condition, determining that new fuel is not injected into the engine.
6. The engine control method according to any one of claims 1 to 5, characterized in that, when the nox concentration is acquired at least twice, the step of determining a fuel quality coefficient from a preset ignition control map based on the nox concentration and the engine torque includes:
determining a plurality of control coefficients from a preset ignition control map based on each of the nox concentrations and the corresponding engine torque, respectively;
and calculating a fuel quality coefficient based on a plurality of control coefficients.
7. The engine control method according to any one of claims 1 to 5, characterized in that the step of controlling the intake air pressure of the engine includes:
multiplying the fuel quality coefficient by the adding time of the engine to obtain the actual oil injection time;
and controlling the air inlet pressure of the engine based on the actual oil injection duration, wherein the longer the actual oil injection duration is, the larger the air inlet pressure is.
8. An engine control apparatus, characterized by comprising:
the acquisition module is used for acquiring the concentration of nitrogen oxides in the original row of the engine at least once through a NOx sensor arranged at the upstream of the three-way catalyst, and acquiring the engine torque corresponding to the concentration of the nitrogen oxides;
the determining module is used for determining a fuel quality coefficient from a preset ignition control chart based on the nitrogen oxide concentration and the engine torque;
and the control module is used for controlling the air inlet pressure of the engine based on the fuel quality coefficient if the fuel quality coefficient is in a first preset range.
9. An engine control apparatus, characterized by comprising: a memory, a processor, and an engine control program stored on the memory and executable on the processor, the engine control program configured to implement the steps of the engine control method of any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon an engine control program which, when executed by a processor, implements the steps of the engine control method according to any one of claims 1 to 7.
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| CN202310780093.3A CN116591837A (en) | 2023-06-28 | 2023-06-28 | Engine control method, device, equipment and computer readable storage medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310780093.3A CN116591837A (en) | 2023-06-28 | 2023-06-28 | Engine control method, device, equipment and computer readable storage medium |
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