Engine Control Method, Device, Equipment and Computer Readable Storage Medium

Abstract

The present invention relates to the field of automotive control technology, and particularly to an engine control method, device, equipment and computer-readable storage medium. The engine control method includes: obtaining the concentration of nitrogen oxides in the original exhaust of the engine at least once through a NOx sensor installed upstream of the three-way catalytic converter, and obtaining the engine torque corresponding to the nitrogen oxide concentration; determining a fuel quality coefficient from a preset ignition control map based on the nitrogen oxide concentration and the engine torque; if the fuel quality coefficient is within a first preset range, controlling the intake pressure of the engine based on the fuel quality coefficient. The present invention realizes detecting the fuel quality in the engine before controlling the intake pressure of the engine, and controlling the intake pressure of the engine based on the fuel quality when the fuel quality is normal, so as to consider the interference of the fuel quality on the intake pressure during the process of controlling the intake pressure, improve the accuracy of controlling the intake pressure of the engine, and thus reduce the pollution of the engine exhaust gas.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle control, and particularly to an engine control method, device, equipment and computer-readable storage medium. Background Technique

[0002] During the operation of a vehicle, the vehicle controls the intake pressure of the engine to control the intake air volume during the fuel combustion process of the engine, thereby controlling the products of the engine fuel combustion and minimizing the amount of pollutants in the engine exhaust gas as much as possible. Currently, it mainly measures the oxygen concentration and fuel injection pressure in the exhaust gas, and then controls the intake pressure to keep the intake air volume within a reasonable range. If the oxygen concentration in the engine exhaust gas is too high, it indicates that the engine intake air volume is too large, and incomplete fuel combustion will cause an increase in pollutants. At this time, the engine intake air volume should be reduced. Similarly, if the oxygen concentration is too low, incomplete fuel combustion will also occur, resulting in an increase in pollutants, and the engine intake air volume should be increased at this time.

[0003] However, the products of fuel combustion are not only related to the intake air volume but also to the fuel quality. When controlling through the above control method, if the change in oxygen concentration is caused by the fuel quality, then the adjustment of the fuel injection pressure and intake air volume based on the oxygen concentration is inaccurate, and incomplete fuel combustion may still occur, increasing the amount of pollutants in the exhaust gas. Summary of the Invention

[0004] The main object of the present invention is to provide an engine control method, device, equipment and computer-readable storage medium, aiming to provide a method for controlling the engine based on fuel quality, improving the control accuracy of the engine intake pressure, and thus reducing the pollution of the engine exhaust gas.

[0005] To achieve the above object, the present invention provides an engine control method, and the engine control method includes:

[0006] Obtain the nitrogen oxide concentration in the original engine exhaust at least once through a NOx sensor installed upstream of the three-way catalytic converter, and obtain the engine torque corresponding to the nitrogen oxide concentration;

[0007] Based on the nitrogen oxide concentration and the engine torque, determine a fuel quality coefficient from a preset ignition control map;

[0008] If the fuel quality coefficient is within a first preset range, control the intake pressure of the engine based on the fuel quality coefficient.

[0009] Optionally, before the step of obtaining the nitrogen oxide concentration in the original engine exhaust through a NOx sensor installed upstream of the three-way catalytic converter, it further includes:

[0010] Detect whether the operating condition of the engine reaches a preset condition, where the preset condition is a working condition point at which the difference between the fuel quality coefficients of different quality fuels exceeds a preset value;

[0011] If the operating condition reaches the preset condition, then execute the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine through a NOx sensor installed upstream of the three-way catalytic converter.

[0012] Optionally, the step of if the operating condition reaches the preset condition, then execute the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine through a NOx sensor installed upstream of the three-way catalytic converter includes:

[0013] If the engine reaches the preset condition, then detect whether the running duration of the engine under the operating condition reaches a first preset duration;

[0014] If the running duration reaches the first preset duration, then execute the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine through a NOx sensor installed upstream of the three-way catalytic converter.

[0015] Optionally, before the step of detecting whether the operating condition of the engine reaches a preset condition, it further includes:

[0016] Detect whether new fuel is injected into the engine;

[0017] If new fuel is injected into the engine, then execute the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine through a NOx sensor installed upstream of the three-way catalytic converter at least once.

[0018] Optionally, the engine control method further includes:

[0019] Monitor the fuel level in the engine;

[0020] The step of detecting whether new fuel is injected into the engine includes:

[0021] Detect whether the fuel level meets a preset condition, where the preset condition is that the change value of the fuel level exceeds a second preset range within a second preset duration;

[0022] If the fuel level meets the preset condition, then determine that new fuel is injected into the engine;

[0023] If the fuel level does not meet the preset condition, then determine that no new fuel is injected into the engine.

[0024] Optionally, when obtaining the nitrogen oxide concentration at least twice, the step of determining the fuel quality coefficient from a preset ignition control map based on the nitrogen oxide concentration and the engine torque includes:

[0025] Determine a plurality of control coefficients from a preset ignition control map respectively based on each of the nitrogen oxide concentrations and the corresponding engine torque;

[0026] Calculate a fuel quality coefficient based on the plurality of control coefficients.

[0027] Optionally, the step of controlling the intake pressure of the engine includes:

[0028] Multiply the fuel quality coefficient by the fuel addition duration of the engine to obtain an actual fuel injection duration;

[0029] Control the intake pressure of the engine based on the actual fuel injection duration, wherein the longer the actual fuel injection duration, the greater the intake pressure.

[0030] In addition, to achieve the above object, the present invention further provides an engine control device, and the engine control device includes:

[0031] An acquisition module, configured to acquire at least once the nitrogen oxide concentration in the original exhaust of the engine through a NOx sensor installed upstream of the three-way catalytic converter, and acquire the engine torque corresponding to the nitrogen oxide concentration;

[0032] A determination module, configured to determine a fuel quality coefficient from a preset ignition control map based on the nitrogen oxide concentration and the engine torque;

[0033] A control module, configured to, if the fuel quality coefficient is within a first preset range, control the intake pressure of the engine based on the fuel quality coefficient.

[0034] In addition, to achieve the above object, the present invention further provides an engine control device, and the engine control device includes a memory, a processor, and an engine control program stored on the memory and executable on the processor. When the engine control program is executed by the processor, the steps of the above engine control method are implemented.

[0035] In addition, to achieve the above object, the present invention further provides a computer-readable storage medium, and an engine control program is stored on the computer-readable storage medium. When the engine control program is executed by a processor, the steps of the above engine control method are implemented.

[0036] In the present invention, the concentration of nitrogen oxides in the original exhaust gas of the engine is obtained at least once by an NOx sensor installed upstream of the three-way catalyst, and the engine torque corresponding to the concentration of nitrogen oxides is obtained; based on the concentration of nitrogen oxides and the engine torque, a fuel quality coefficient is determined from a preset ignition control map; if the fuel quality coefficient is within a first preset range, it is determined that the fuel quality is normal, and the intake pressure of the engine is controlled. The present invention realizes the detection of the fuel quality in the engine before controlling the intake pressure of the engine, and controls the intake pressure of the engine based on the fuel quality when the fuel quality is normal, so that the interference of the fuel quality on the intake pressure is considered during the process of controlling the intake pressure, improving the accuracy of controlling the intake pressure of the engine, and thus reducing the pollution of the engine exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the device structure of the hardware operating environment related to the solution of the embodiment of the present invention;

[0038] Figure 2 It is a schematic flowchart of the first embodiment of the engine control method of the present invention;

[0039] Figure 3 It is a schematic flowchart of a process related to an implementation manner of the engine control method of the present invention;

[0040] Figure 4 It is a schematic flowchart of an embodiment of the engine control method of the present invention.

[0041] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] As Figure 1 shown, Figure 1 It is a schematic diagram of the device structure of the hardware operating environment related to the solution of the embodiment of the present invention.

[0044] It should be noted that for the engine control device in the embodiment of the present invention, the engine control device may be a vehicle controller, or a device that establishes a communication connection with the vehicle controller, such as a computer, a server, etc. Devices, and no specific limitations are made here.

[0045] As Figure 1As shown, the engine control device may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, and a communication bus 1002. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen and an input unit such as a keyboard. Optionally, the user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a 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. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0046] Those skilled in the art can understand that Figure 1 the device structure shown in does not constitute a limitation on the engine control device, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0047] As Figure 1 shown, the memory 1005, as a computer storage medium, may include an operating system, a network communication module, a user interface module, and an engine control program. The operating system is a program that manages and controls the hardware and software resources of the device and supports the operation of the engine control program and other software or programs. In Figure 1 the device shown, the user interface 1003 is mainly used for data communication with the client; the network interface 1004 is mainly used for establishing a communication connection with the server; and the processor 1001 may be used to call the engine control program stored in the memory 1005 and perform the following operations:

[0048] Obtain the nitrogen oxide concentration in the original engine exhaust at least once through a NOx sensor installed upstream of the three-way catalytic converter, and obtain the engine torque corresponding to the nitrogen oxide concentration;

[0049] Based on the nitrogen oxide concentration and the engine torque, determine a fuel quality coefficient from a preset ignition control map;

[0050] If the fuel quality coefficient is within a first preset range, control the intake pressure of the engine based on the fuel quality coefficient.

[0051] Further, before the step of obtaining the nitrogen oxide concentration in the original engine exhaust through a NOx sensor installed upstream of the three-way catalytic converter, the following steps are also included:

[0052] Detect whether the operating condition of the engine reaches a preset condition, where the preset condition is a working condition point at which the difference between the fuel quality coefficients of different quality fuels exceeds a preset value;

[0053] If the operating condition reaches the preset condition, then execute the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine through the NOx sensor installed upstream of the three-way catalytic converter.

[0054] Further, the step of if the operating condition reaches the preset condition, then execute the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine through the NOx sensor installed upstream of the three-way catalytic converter includes:

[0055] If the engine reaches the preset condition, then detect whether the running duration of the engine under the operating condition reaches a first preset duration;

[0056] If the running duration reaches the first preset duration, then execute the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine through the NOx sensor installed upstream of the three-way catalytic converter.

[0057] Further, before the step of detecting whether the operating condition of the engine reaches a preset condition, it further includes:

[0058] Detect whether new fuel is injected into the engine;

[0059] If new fuel is injected into the engine, then execute the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine through the NOx sensor installed upstream of the three-way catalytic converter at least once.

[0060] Further, the engine control method further includes:

[0061] Monitor the fuel level in the engine;

[0062] The step of detecting whether new fuel is injected into the engine includes:

[0063] Detect whether the fuel level meets a preset condition, where the preset condition is that the change value of the fuel level exceeds a second preset range within a second preset duration;

[0064] If the fuel level meets the preset condition, then determine that new fuel is injected into the engine;

[0065] If the fuel level does not meet the preset condition, then determine that no new fuel is injected into the engine.

[0066] Further, when the nitrogen oxide concentration is acquired at least twice, the step of determining the fuel quality coefficient from a preset ignition control map based on the nitrogen oxide concentration and the engine torque includes:

[0067] Respectively determine a plurality of control coefficients from the preset ignition control map based on each of the nitrogen oxide concentrations and the corresponding engine torque;

[0068] Calculate the fuel quality coefficient based on the plurality of control coefficients.

[0069] Further, the step of controlling the intake pressure of the engine includes:

[0070] Multiply the fuel quality coefficient by the fuel addition duration of the engine to obtain the actual fuel injection duration;

[0071] Control the intake pressure of the engine based on the actual fuel injection duration, wherein the longer the actual fuel injection duration, the greater the intake pressure.

[0072] Based on the above structure, various embodiments of the engine control method are proposed.

[0073] Refer to Figure 2 , Figure 2 which is a schematic flowchart of the first embodiment of the engine control method of the present invention.

[0074] The embodiments of the present invention provide embodiments of the engine control method. It should be noted that although the logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than here. In this embodiment, the engine control method may be a vehicle controller, or a vehicle controller, or a device that establishes a communication connection with the vehicle controller, such as a computer, a server, etc. In this embodiment, the engine control method includes:

[0075] Step S10, obtain the nitrogen oxide concentration in the original exhaust of the engine at least once through a NOx sensor installed upstream of the three-way catalytic converter, and obtain the engine torque corresponding to the nitrogen oxide concentration;

[0076] The current engine intake pressure adaptive control process is as follows: 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, and thus the engine intake pressure is determined, and the engine intake is controlled based on the determined intake pressure.

[0077] If there are problems with the fuel components in the engine, such as nozzle aging, then the amount of fuel sprayed by the nozzle decreases, and the oxygen concentration in the exhaust gas increases. At this time, based on the above control process, the fuel injection pressure and intake pressure of the engine will be increased so that the fuel can burn completely and reduce the pollution of the exhaust gas. However, if the problem lies in the change of fuel quality, such as the decrease of fuel calorific value, then even if the fuel pressure is normal, it will still cause incomplete combustion of the fuel, resulting in an increase in oxygen concentration. At this time, based on the above control process, the fuel injection pressure of the engine will still be increased. However, due to the problem of fuel quality, the intake air volume required for complete combustion of the fuel has changed, that is, the correlation between the injection pressure and the intake pressure has changed. If the fuel injection pressure of the engine is still controlled according to the previous fuel quality, incomplete combustion of the fuel may still occur.

[0078] Therefore, this embodiment proposes a method for controlling the intake pressure of an engine based on fuel quality, which detects the fuel quality before controlling the intake pressure to accurately control the intake pressure of the engine. Specifically, the fuel quality referred to in this embodiment can specifically refer to the calorific value of the fuel, the content of impurities in the fuel, or other indicators related to fuel quality, which are not limited here.

[0079] In this embodiment, the engine exhaust gas upstream of the three-way catalytic converter is called the original exhaust of the engine. Incomplete combustion caused by engine part problems (such as nozzle aging, nozzle consistency problems, etc.) and fuel quality changes will also cause incomplete combustion. In both cases, the concentration of NOx (nitrogen oxides) in the original exhaust of the engine is different. Incomplete combustion caused by engine part problems is due to the mismatch between the fuel quantity and the air quantity. Under this problem, the NOx concentration in the original exhaust under the same working condition will not change, while incomplete combustion caused by fuel quality will cause an increase in the NOx concentration in the original exhaust. Therefore, in this embodiment, the fuel quality coefficient is determined based on the NOx in the original exhaust. The fuel quality coefficient can represent the quality of the fuel. For example, for the fuel calorific value, the larger the fuel quality coefficient, the higher the fuel calorific value. Since the three-way catalytic converter will convert harmful gases such as CO, HC, and NOx in the original exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction, in this embodiment, the NOx concentration in the original exhaust of the engine upstream of the three-way catalytic converter is obtained specifically by an NOx sensor installed upstream of the three-way catalytic converter. In the specific detection process, the NOx concentration can be obtained multiple times, and the fuel quality coefficient is determined based on multiple NOx concentrations to improve the accuracy of the fuel quality coefficient; or the NOx concentration can be obtained once, and the fuel quality coefficient is determined based on one NOx concentration to reduce the detection steps and improve the detection efficiency, which are not limited here.

[0080] In this embodiment, the engine torque corresponding to the nitrogen oxide concentration is also obtained, that is, the nitrogen oxide concentration and the engine torque at the same moment are obtained. The specific method for obtaining the torque is not limited herein. For example, in a feasible embodiment, it may be to determine the moment when the nitrogen oxide concentration is obtained, and determine the engine torque at this moment from the vehicle operation data according to this moment; in another feasible embodiment, it may also be to determine the vehicle operation condition when the nitrogen oxide concentration is obtained, and determine the engine torque according to the operation condition.

[0081] Step S20: Determine the fuel quality coefficient from a preset ignition control map based on the nitrogen oxide concentration and the engine torque;

[0082] In this embodiment, a MAP (ignition control curve) map with the nitrogen oxide concentration and the engine torque as independent variables and the fuel quality coefficient as the dependent variable is preset, which is hereinafter referred to as the ignition control map for convenience of description. The preset ignition control map can be obtained by testing on a test bench through a single-variable experiment using fuels of different qualities. The specific test process is not elaborated herein.

[0083] Based on the nitrogen oxide concentration and the engine torque, determine the fuel quality coefficient from the preset ignition control map.

[0084] Further, in a feasible embodiment, when the fuel quality refers to the fuel calorific value, the preset ignition control map can also use the fuel calorific value as the dependent variable, that is, based on the nitrogen oxide concentration and the engine torque, determine the fuel calorific value from the preset ignition control map; then determine the quality coefficient according to the mapping relationship between the fuel calorific value and the quality coefficient, where the higher the fuel calorific value, the higher the quality coefficient.

[0085] Step S30: If the fuel quality coefficient is within a first preset range, control the intake pressure of the engine based on the fuel quality coefficient.

[0086] In this embodiment, after the fuel quality coefficient is determined, it is detected whether the fuel quality coefficient is within a preset reasonable range (hereinafter referred to as the first preset range for distinction). If the fuel quality coefficient is within the first preset range, it is determined that the fuel quality is within a reasonable range, and this fuel can be used for the engine to work. At this time, considering the influence of fuel quality change on the engine intake pressure, the intake pressure of the engine is controlled based on the fuel quality coefficient, so that the current intake pressure is determined based on the fuel quality of the current engine fuel, improving the accuracy of intake pressure control.

[0087] Further, in a feasible embodiment, if the fuel quality coefficient is within the first preset range, a fuel quality coefficient overlimit fault is reported to prompt the user to check the fuel quality.

[0088] In this embodiment, the concentration of nitrogen oxides in the original exhaust of the engine is obtained at least once by an NOx sensor installed upstream of the three-way catalytic converter, and the engine torque corresponding to the concentration of nitrogen oxides is obtained. Based on the concentration of nitrogen oxides and the engine torque, a fuel quality coefficient is determined from a preset ignition control map. If the fuel quality coefficient is within a first preset range, it is determined that the fuel quality is normal, and the intake pressure of the engine is controlled. This embodiment realizes the detection of the fuel quality in the engine before controlling the intake pressure of the engine, and controls the intake pressure of the engine based on the fuel quality when the fuel quality is normal, so that the interference of the fuel quality on the intake pressure is considered during the process of controlling the intake pressure, improving the accuracy of controlling the intake pressure of the engine, and thus reducing the pollution of the engine exhaust gas.

[0089] Further, based on the above first embodiment, a second embodiment of the engine control method of the present invention is proposed. In this embodiment, before the step S10, the following is further included:

[0090] Step S40, detecting whether the operating condition of the engine reaches a preset condition, where the preset condition is a working condition point at which the difference between the fuel quality coefficients of different quality fuels exceeds a preset value;

[0091] In this embodiment, the operating conditions for determining the fuel quality coefficient are preset (hereinafter referred to as preset conditions for distinction). Exemplarily, in a feasible implementation manner, the preset conditions can be determined according to the ignition control map. Specifically, the working condition points corresponding to the torque at which the difference between the fuel quality coefficients of different quality fuels exceeds a preset value can be selected as the preset conditions, or the preset conditions can be set according to actual requirements, which are not limited herein.

[0092] Detect whether the operating condition of the engine reaches the preset condition. In a feasible implementation manner, it can be determined whether the operating condition reaches the preset condition through the torque comparison result. When the operating torque of the engine is the same as the torque of the preset condition, it is determined that the operating condition reaches the preset condition; in another feasible implementation manner, it can also be determined whether the operating condition reaches the preset condition according to the engine speed, and the specific determination method is the same as that of the torque.

[0093] Step S50, if the operating condition reaches the preset condition, then execute the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine by an NOx sensor installed upstream of the three-way catalytic converter.

[0094] In this embodiment, if the operating condition reaches the preset condition, it is determined that the engine is in a condition where the fuel quality coefficients are significantly different. At this time, a more accurate fuel quality coefficient can be obtained. Therefore, the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine by an NOx sensor installed upstream of the three-way catalytic converter is executed to determine the fuel quality coefficient.

[0095] Further, in a feasible implementation, the step S50 includes:

[0096] Step S501, if the engine reaches the preset operating condition, detect whether the running duration of the engine under the operating condition reaches a first preset duration;

[0097] In this implementation, if the engine reaches the preset operating condition, detect whether the running duration of the engine under the operating condition reaches a first preset duration to determine whether the vehicle is running stably.

[0098] Step S502, if the running duration reaches the first preset duration, execute the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine through the NOx sensor installed upstream of the three-way catalytic converter.

[0099] If the running duration reaches the first preset duration, it is determined that the vehicle is running stably. At this time, the fuel quality coefficient can be determined to control the intake pressure, and the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine through the NOx sensor installed upstream of the three-way catalytic converter is executed.

[0100] Further, in a feasible implementation, if the running duration does not reach the first preset duration, the intake pressure can be adjusted according to the adaptive coefficient corresponding to the oxygen concentration to reduce the engine exhaust pollution.

[0101] Further, in a feasible implementation, before the step S40, the following is further included:

[0102] Step S60, detect whether new fuel is injected into the engine;

[0103] In this implementation, before determining the fuel quality coefficient and adjusting the intake pressure according to the fuel quality coefficient, it can be detected whether new fuel is injected into the engine.

[0104] Step S70, if new fuel is injected into the engine, execute the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine through the NOx sensor installed upstream of the three-way catalytic converter at least once.

[0105] If new fuel is injected into the engine, it is necessary to re-determine the fuel quality coefficient, thereby improving the accuracy of controlling the intake pressure, and execute the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine through the NOx sensor installed upstream of the three-way catalytic converter at least once.

[0106] Further, in a feasible implementation, if no new fuel is injected into the engine, the intake pressure can be adjusted according to the previous fuel quality coefficient; or the intake pressure can be adjusted according to the adaptive coefficient corresponding to the oxygen concentration.

[0107] Further, in a feasible embodiment, the engine control method further includes:

[0108] Step S80, monitoring the fuel level in the engine;

[0109] In this embodiment, the fuel level in the engine is monitored to determine whether new fuel is injected into the engine.

[0110] In this embodiment, the step S60 includes:

[0111] Step S601, detecting whether the fuel level meets a preset condition, where the preset condition is that the change value of the fuel level exceeds a second preset range within a second preset duration;

[0112] In this embodiment, a preset condition for characterizing the injection of new fuel is set in advance, where the preset condition is that the change value of the fuel level exceeds a second preset range within a second preset duration. That is, the preset condition characterizes a large increase (i.e., the second preset range) in the engine fuel within the second preset duration. Further, in a feasible embodiment, the preset condition can also limit the fuel level before the fuel level change (hereinafter referred to as the reference level for distinction) to be lower than a preset level, and the preset level can be set according to actual needs. In this embodiment, it is detected whether the fuel level meets the preset condition.

[0113] Step S602, if the fuel level meets the preset condition, determining that new fuel is injected into the engine;

[0114] If the fuel level meets the preset condition, it is determined that there is a large increase (i.e., the second preset range) in the engine fuel within the second preset duration, and it is determined that new fuel is injected into the engine.

[0115] Step S603, if the fuel level does not meet the preset condition, determining that no new fuel is injected into the engine.

[0116] If the fuel level does not meet the preset condition, it is determined that the engine fuel has not had a large increase (i.e., the second preset range) within the second preset duration. It may be that new fuel has been injected into the engine in small amounts multiple times, or it may be that only a small amount of new fuel has been injected into the engine, or it may be that no new fuel has been injected. In this embodiment, all the above possible situations are regarded as no new fuel being injected into the engine.

[0117] In this embodiment, by detecting whether the operating condition of the engine reaches a preset condition, where the preset condition is a working condition point at which the difference between the fuel quality coefficients of different-quality fuels exceeds a preset value; if the operating condition reaches the preset condition, then perform the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine through a NOx sensor installed upstream of the three-way catalytic converter. This implementation can obtain a more accurate fuel quality coefficient, thereby improving the accuracy of intake pressure control and reducing the pollution of vehicle exhaust.

[0118] Further, based on the above first and / or second embodiments, a third embodiment of the engine control method of the present invention is proposed. In this embodiment, when the concentration of nitrogen oxides is obtained at least twice, the step S20 includes:

[0119] Step S201, respectively determine a plurality of control coefficients from a preset ignition control map based on each of the nitrogen oxide concentrations and the corresponding engine torque;

[0120] In this embodiment, respectively determine a plurality of fuel quality coefficients (hereinafter referred to as control coefficients for distinction) from a preset ignition control map based on each of the nitrogen oxide concentrations and the corresponding engine torque.

[0121] Step S202, calculate a fuel quality coefficient based on the plurality of control coefficients.

[0122] Calculate a fuel quality coefficient based on the plurality of control coefficients.

[0123] In a specific implementation manner, it may be to take the average value of the plurality of control coefficients as the fuel quality coefficient; it may also be to take the average value of the plurality of control coefficients as the fuel quality coefficient, which is not limited herein and can be set according to actual needs.

[0124] Further, in a feasible implementation manner, the step S30 includes:

[0125] Step S301, multiply the fuel quality coefficient by the fuel injection duration of the engine to obtain the actual fuel injection duration;

[0126] Multiply the fuel quality coefficient by the fuel injection duration of the engine (i.e., the duration of fuel injection by the nozzle) to obtain the actual fuel injection duration, and control the fuel injection amount by controlling the fuel injection duration.

[0127] Step S302, control the intake pressure of the engine based on the actual fuel injection duration, where the longer the actual fuel injection duration, the greater the intake pressure.

[0128] For the same engine, the fuel injection pressure is maintained at a constant value (hereinafter referred to as the preset pressure constant value for distinction), that is, the fuel injection pressure of the nozzle per unit time is constant. Therefore, based on the actual fuel injection duration, the actual fuel injection volume can be determined.

[0129] Based on the actual fuel injection duration, determine the actual fuel injection volume, and based on the actual fuel injection volume, determine the required air volume, so as to obtain the intake pressure of the engine and control the intake pressure of the engine. Among them, the longer the actual fuel injection duration, the more air volume is required, and the greater the intake pressure.

[0130] Furthermore, in a feasible implementation manner, an adaptive coefficient of the fuel injection pressure can also be determined based on the oxygen concentration; calculate the product of the adaptive coefficient and the fuel injection coefficient to obtain an adjustment coefficient; use the adjustment coefficient to calculate the actual fuel injection duration for the fuel addition duration. That is, in this implementation manner, the influence of engine component problems on the intake pressure is also considered, further improving the accuracy of intake pressure control and reducing the pollution of vehicle exhaust.

[0131] In this embodiment, by respectively based on each nitrogen oxide concentration and the corresponding engine torque, determine a plurality of control coefficients from a preset ignition control diagram; calculate a fuel quality coefficient based on the plurality of control coefficients. By obtaining the NOx concentration multiple times in this embodiment and determining the fuel quality coefficient based on the plurality of NOx concentrations, the accuracy of the fuel quality coefficient can be improved, thereby improving the accuracy of intake control.

[0132] Furthermore, in a feasible implementation manner, with reference to Figure 3 , the control process of controlling the intake pressure in this implementation manner can be:

[0133] Monitor the fuel level of the engine, and based on the fuel level, detect whether new fuel is injected into the engine. Furthermore, in a feasible implementation manner, it can be considered that a new tank of fuel is added when the fuel level is detected to increase from the empty position to the full position.

[0134] In this implementation manner, detect whether the fuel self-adaptation calculation for the newly added fuel is completed. The self-adaptation calculation refers to the entire process of adjusting the intake pressure based on the fuel quality coefficient. If the self-adaptation calculation is completed, stop the self-adaptation calculation for this tank of fuel; if the self-adaptation calculation is not completed, activate the self-adaptation function and perform the self-adaptation calculation for this tank of fuel.

[0135] Enter adaptive calculation to detect whether the engine operating condition reaches a preset condition and whether the operating duration under this condition reaches a preset duration. If the operating condition reaches the preset condition and the engine operating duration under this condition reaches the preset duration, obtain the nitrogen oxide concentration in the original engine exhaust multiple times through the NOx sensor installed upstream of the three-way catalytic converter, and obtain the engine torque corresponding to the nitrogen oxide concentration; based on the nitrogen oxide concentration and the engine torque, determine multiple control coefficients from the preset ignition control map; calculate the fuel quality coefficient based on each control coefficient. If the operating condition does not reach the preset condition or the engine operating duration under this condition does not reach the preset duration, return to detect whether the fuel adaptive calculation for the newly added fuel is completed.

[0136] Judge whether the fuel quality coefficient is within the preset range. If the fuel quality coefficient is within the preset range, control the intake pressure of the engine based on the fuel quality coefficient. The specific correction process is to correct the fuel injection volume of the engine according to the fuel quality coefficient, and then correct the intake pressure to ensure that the output torque after correction will not change due to the fuel quality. If the fuel quality coefficient exceeds the preset range, report an adaptive coefficient overrun fault and remind to check the fuel quality.

[0137] In addition, an embodiment of the present invention also proposes an engine control device. Refer to Figure 4 , the engine control device includes:

[0138] An acquisition module 10 for obtaining the nitrogen oxide concentration in the original engine exhaust at least once through the NOx sensor installed upstream of the three-way catalytic converter, and obtaining the engine torque corresponding to the nitrogen oxide concentration;

[0139] A determination module 20 for determining the fuel quality coefficient from the preset ignition control map based on the nitrogen oxide concentration and the engine torque;

[0140] A control module 30 for controlling the intake pressure of the engine based on the fuel quality coefficient if the fuel quality coefficient is within the first preset range.

[0141] Furthermore, the engine control device further includes a detection module for:

[0142] Detect whether the operating condition of the engine reaches a preset condition, where the preset condition is a working condition point at which the difference between the fuel quality coefficients of different quality fuels exceeds a preset value;

[0143] If the operating condition reaches the preset condition, execute the step of obtaining the nitrogen oxide concentration in the original engine exhaust through the NOx sensor installed upstream of the three-way catalytic converter.

[0144] Further, the detection module is further configured to:

[0145] If the engine reaches the preset operating condition, detect whether the operating duration of the engine under the operating condition reaches a first preset duration;

[0146] If the operating duration reaches the first preset duration, execute the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine through the NOx sensor installed upstream of the three-way catalytic converter.

[0147] Further, the detection module is further configured to:

[0148] Detect whether new fuel is injected into the engine;

[0149] If new fuel is injected into the engine, execute the step of obtaining the concentration of nitrogen oxides in the original exhaust of the engine through the NOx sensor installed upstream of the three-way catalytic converter at least once.

[0150] Further, the engine control device further includes a monitoring module, configured to:

[0151] Monitor the fuel level in the engine;

[0152] The detection module is further configured to:

[0153] Detect whether the fuel level meets a preset condition, where the preset condition is that the change value of the fuel level within a second preset duration exceeds a second preset range;

[0154] If the fuel level meets the preset condition, determine that new fuel is injected into the engine;

[0155] If the fuel level does not meet the preset condition, determine that no new fuel is injected into the engine.

[0156] Further, the determination module 20 is further configured to:

[0157] Respectively determine a plurality of control coefficients from a preset ignition control map based on each of the nitrogen oxide concentrations and the corresponding engine torque;

[0158] Calculate a fuel quality coefficient based on the plurality of control coefficients.

[0159] Further, the adjustment module is further configured to:

[0160] Multiply the fuel quality coefficient by the refueling duration of the engine to obtain the actual fuel injection duration;

[0161] Control the intake pressure of the engine based on the actual fuel injection duration, where the longer the actual fuel injection duration, the greater the intake pressure.

[0162] For each embodiment of the engine control device of the present invention, reference may be made to each embodiment of the engine control method of the present invention, which will not be elaborated here.

[0163] In addition, an embodiment of the present invention further provides a computer-readable storage medium, on which an engine control program is stored. When the engine control program is executed by a processor, the steps of the engine control method described below are implemented.

[0164] For each embodiment of the engine control device and the computer-readable storage medium of the present invention, reference may be made to each embodiment of the engine control method of the present invention, which will not be elaborated here.

[0165] It should be noted that in this text, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "including a..." does not exclude the presence of additional identical elements in the process, method, article or system including that element.

[0166] The serial numbers of the above embodiments of the present invention are only for description and do not represent the superiority or inferiority of the embodiments.

[0167] Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a computer-readable storage medium as described above (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions for causing an engine control device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

[0168] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An engine control method, characterized in that, The engine control method includes: Obtaining the nitrogen oxide concentration in the original exhaust of the engine at least once through a NOx sensor installed upstream of the three-way catalyst, and obtaining the engine torque corresponding to the nitrogen oxide concentration; Determining a fuel quality coefficient from a preset ignition control map based on the nitrogen oxide concentration and the engine torque; If the fuel quality coefficient is within a first preset range, controlling the intake pressure of the engine based on the fuel quality coefficient.

2. The engine control method according to claim 1, characterized in that, Before the step of obtaining the nitrogen oxide concentration in the original exhaust of the engine through a NOx sensor installed upstream of the three-way catalyst, it further includes: Detecting whether the operating condition of the engine reaches a preset condition, where the preset condition is a working condition point at which the difference between the fuel quality coefficients of different quality fuels exceeds a preset value; If the operating condition reaches the preset condition, performing the step of obtaining the nitrogen oxide concentration in the original exhaust of the engine through a NOx sensor installed upstream of the three-way catalyst.

3. The engine control method according to claim 2, wherein The step of if the operating condition reaches the preset condition, performing the step of obtaining the nitrogen oxide concentration in the original exhaust of the engine through a NOx sensor installed upstream of the three-way catalyst includes: If the engine reaches the preset condition, detecting whether the operating duration of the engine under the operating condition reaches a first preset duration; If the operating duration reaches the first preset duration, performing the step of obtaining the nitrogen oxide concentration in the original exhaust of the engine through a NOx sensor installed 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 operating condition of the engine reaches a preset condition, it further includes: Detecting whether new fuel is injected into the engine; If new fuel is injected into the engine, performing the step of obtaining the nitrogen oxide concentration in the original exhaust of the engine at least once through a NOx sensor installed upstream of the three-way catalyst.

5. The engine control method according to claim 4, wherein The engine control method further includes: Monitoring the fuel level in the engine; The step of detecting whether new fuel is injected into the engine includes: Detecting whether the fuel level meets a preset condition, where the preset condition is that the change value of the fuel level within a second preset duration exceeds a second preset range; If the fuel level meets the preset condition, determining that new fuel is injected into the engine; If the fuel level does not meet the preset condition, determining that no new fuel is injected into the engine.

6. The engine control method according to any one of claims 1 to 5, characterized in that, When the nitrogen oxide concentration is obtained at least twice, the step of determining a fuel quality coefficient from a preset ignition control map based on the nitrogen oxide concentration and the engine torque includes: Respectively determining a plurality of control coefficients from the preset ignition control map based on each nitrogen oxide concentration and the corresponding engine torque; Calculating a fuel quality coefficient based on the 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 pressure of the engine includes: Multiplying the fuel quality coefficient by the fuel injection duration of the engine to obtain an actual fuel injection duration; Controlling the intake pressure of the engine based on the actual fuel injection duration, where the longer the actual fuel injection duration, the greater the intake pressure.

8. An engine control device, characterized in that, The engine control device includes: An acquisition module, configured to acquire at least once the concentration of nitrogen oxides in the original exhaust gas of the engine through a NOx sensor installed upstream of the three-way catalytic converter, and acquire the engine torque corresponding to the concentration of nitrogen oxides; A determination module, configured to determine a fuel quality coefficient from a preset ignition control map based on the concentration of nitrogen oxides and the engine torque; A control module, configured to, if the fuel quality coefficient is within a first preset range, control the intake pressure of the engine based on the fuel quality coefficient.

9. An engine control device, characterized in that, The engine control device includes: a memory, a processor, and an engine control program stored on the memory and executable on the processor, where the engine control program is configured to implement the steps of the engine control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, An engine control program is stored on the computer-readable storage medium, and when the engine control program is executed by a processor, the steps of the engine control method according to any one of claims 1 to 7 are implemented.

Images