Ignition control method and device of engine and vehicle

Abstract

The invention relates to an ignition control method and device of an engine and a vehicle, relates to the technical field of engine control, and aims at solving the technical problem that in the prior art, the cost of arranging an ethanol concentration sensor is high. The target air-fuel ratio of fuel in an oil tank of the engine is determined through a front oxygen signal obtained by the front oxygen sensor, the ethanol concentration of the fuel in the oil tank of the engine is obtained according to the target air-fuel ratio, and ignition operation of the engine is controlled according to the ethanol concentration.

Description

Technical Field

[0001] The present invention relates to the technical field of engine control, and in particular to an engine ignition control method, device and vehicle. Background Art

[0002] In some regions, car users can freely refill fuel with different ethanol concentrations, causing the ethanol concentration in the fuel tank to randomly vary between 0% and 100%. Because the fuel properties of ethanol differ from those of gasoline, fuels with different ethanol concentrations have different fuel properties. To achieve the optimal balance between combustion efficiency, power output, and emissions control, fuels with different ethanol concentrations correspond to different ideal air-fuel ratios, ignition advance angles, and charging efficiencies.

[0003] In the related art, in order to ensure stable operation of an engine using flexible fuel, an ethanol concentration sensor is usually provided to detect the ethanol concentration in the fuel, thereby controlling the engine ignition.

[0004] However, the provision of an ethanol concentration sensor increases system cost. Summary of the Invention

[0005] The present application provides an engine ignition control method, device and vehicle to solve the technical problem that the related art uses an ethanol concentration sensor to detect the ethanol concentration in the fuel, resulting in high system costs.

[0006] In order to achieve the above objectives, the technical solutions adopted in this application are as follows:

[0007] In a first aspect, an engine ignition control method is provided, comprising: determining a target air-fuel ratio of fuel in a fuel tank of the engine using a front oxygen signal acquired by a front oxygen sensor during engine operation; obtaining an ethanol concentration of the fuel in the fuel tank based on the target air-fuel ratio; and controlling engine ignition based on the ethanol concentration.

[0008] As can be seen from the above, there is a corresponding relationship between ethanol concentration and the ideal air-fuel ratio. This embodiment uses the front oxygen signal acquired by the front oxygen sensor to detect the target air-fuel ratio of the fuel in the engine, i.e., the ideal air-fuel ratio. Based on the target air-fuel ratio, the ethanol concentration of the fuel in the engine's fuel tank can be calculated. This embodiment eliminates the need for an additional ethanol concentration sensor, utilizing only the front oxygen signal acquired by the vehicle's existing front oxygen sensor to determine the ethanol concentration in the fuel. This in turn controls engine ignition based on the ethanol concentration, significantly reducing system costs. Furthermore, by dynamically adjusting ignition parameters, the engine consistently maintains optimal combustion efficiency, power output, and emissions control, achieving an optimal balance between performance and cost.

[0009] Optionally, the target air-fuel ratio of the fuel in the engine's fuel tank is determined by using a front oxygen signal obtained by a front oxygen sensor, including: when the front oxygen signal satisfies a first preset condition, adjusting the engine's intake volume and / or fuel injection volume until the front oxygen signal satisfies a second preset condition, and determining the target air-fuel ratio of the fuel in the engine's fuel tank; when the front oxygen signal satisfies the first preset condition, indicating that the actual air-fuel ratio of the engine is not equal to the target air-fuel ratio; when the front oxygen signal satisfies the second preset condition, indicating that the actual air-fuel ratio of the engine is equal to the target air-fuel ratio.

[0010] As can be seen from the above, during engine operation, the oxygen concentration of the exhaust gas emitted by the engine varies at different air-fuel ratios. In the embodiment of the present application, when the front oxygen signal meets the first preset condition, it indicates that the actual air-fuel ratio of the engine is not equal to the target air-fuel ratio. When the front oxygen signal meets the second preset condition, it indicates that the actual air-fuel ratio of the engine is equal to the target air-fuel ratio. To achieve the optimal balance between combustion efficiency, power output, and emission control, the air-fuel ratio must be at the target air-fuel ratio. Therefore, when the front oxygen signal meets the first preset condition, it is necessary to adjust the engine's intake volume and / or fuel injection volume until the front oxygen signal meets the second preset condition, thereby determining the target air-fuel ratio of the fuel in the engine's fuel tank.

[0011] Optionally, the first preset condition includes: the voltage value corresponding to the front oxygen signal is greater than a first preset threshold, or the voltage value corresponding to the front oxygen signal is less than a second preset threshold; the second preset condition includes: the voltage value corresponding to the front oxygen signal oscillates between the first preset threshold and the second preset threshold, and the second preset threshold is less than the first preset threshold.

[0012] As can be seen from the above, different oxygen sensors correspond to different preset conditions. When the front oxygen sensor is a switch-type oxygen sensor, the first preset condition includes: the voltage value corresponding to the front oxygen signal is greater than the first preset threshold, or the voltage value corresponding to the front oxygen signal is less than the second preset threshold; the second preset condition includes: the voltage value corresponding to the front oxygen signal oscillates between the first preset threshold and the second preset threshold; the second preset threshold is less than the first preset threshold.

[0013] Optionally, when the front oxygen signal satisfies a first preset condition, the engine's intake volume and / or fuel injection volume is adjusted until the front oxygen signal satisfies a second preset condition, and the target air-fuel ratio of the fuel in the engine's fuel tank is determined, including: when the voltage value corresponding to the front oxygen signal is greater than or less than a preset threshold, the engine's intake volume and / or fuel injection volume is adjusted until the voltage value corresponding to the front oxygen signal is equal to the preset threshold, and the target air-fuel ratio of the fuel in the engine's fuel tank is determined.

[0014] As can be seen from the above, to achieve an optimal balance between combustion efficiency, power output, and emissions control, the air-fuel ratio must be at the target air-fuel ratio. When at the target air-fuel ratio, the voltage corresponding to the front oxygen signal is equal to the preset threshold. Therefore, when determining the target air-fuel ratio of the fuel in the engine's fuel tank using the front oxygen signal obtained by the front oxygen sensor, the engine's intake air volume and / or fuel injection volume can be adjusted based on the relationship between the voltage corresponding to the front oxygen signal and the preset threshold, until the voltage corresponding to the front oxygen signal equals the preset threshold, thereby determining the target air-fuel ratio of the fuel in the engine's fuel tank.

[0015] Optionally, when the voltage value corresponding to the front oxygen signal is greater than or less than a preset threshold, adjusting the intake air volume and / or fuel injection amount of the engine includes: increasing the intake air volume and / or decreasing the fuel injection amount when the voltage value corresponding to the front oxygen signal is greater than the preset threshold; and decreasing the intake air volume and / or increasing the fuel injection amount when the voltage value corresponding to the front oxygen signal is less than the preset threshold.

[0016] As can be seen from the above, the air-fuel ratio is the ratio of the mass of air inhaled into the cylinder to the mass of fuel when the engine is working, that is, the ratio of the intake volume to the injection volume. In this embodiment, the actual air-fuel ratio can be adjusted by adjusting the intake volume and / or the injection volume, so that the actual air-fuel ratio is equal to the target air-fuel ratio.

[0017] Optionally, determining a target air-fuel ratio of the fuel in the engine's fuel tank includes: obtaining an intake air volume and an injection fuel volume of the engine; and determining the target air-fuel ratio based on the intake air volume and the injection fuel volume. The target air-fuel ratio is a ratio of the intake air volume to the injection fuel volume.

[0018] As can be seen from the above, the air-fuel ratio is the ratio of the mass of air inhaled into the cylinder to the mass of fuel when the engine is working, that is, the ratio of the intake volume to the injection volume. In the process of continuously adjusting the intake volume and / or injection volume by the front oxygen signal obtained by the front oxygen sensor, the present embodiment can record the intake volume and injection volume. When the voltage value corresponding to the front oxygen signal is equal to the preset threshold, the target air-fuel ratio can be determined based on the intake volume and injection volume, providing a reliable basis for subsequent adjustment of parameters such as injection volume and ignition timing, thereby realizing precise control of the engine.

[0019] Optionally, obtaining the ethanol concentration of the fuel in the engine tank according to the target air-fuel ratio includes: determining the ethanol concentration according to a first mapping relationship and the target air-fuel ratio. The first mapping relationship is used to represent a mapping relationship between the ethanol concentration and the air-fuel ratio.

[0020] As can be seen from the above, the first mapping relationship is used to represent the mapping relationship between ethanol concentration and air-fuel ratio. That is, this embodiment determines ethanol concentration through the first mapping relationship and the target air-fuel ratio, eliminating the need for a dedicated ethanol concentration sensor, thereby reducing cost and system complexity.

[0021] Optionally, controlling the ignition operation of the engine according to the ethanol concentration includes: determining a target charging efficiency and a target ignition angle of the engine according to the ethanol concentration, and controlling the ignition operation of the engine based on the target charging efficiency and the target ignition angle.

[0022] As can be seen from the above, different ethanol concentrations in the fuel affect the intake charge, and different ethanol concentrations result in different optimal ignition angles. This embodiment determines the engine's target charging efficiency and target ignition angle based on the ethanol concentration, and controls the engine's ignition operation based on these targets. This allows the engine to inhale an appropriate amount of air, providing sufficient oxygen for complete fuel combustion, improving combustion efficiency and power output. It also ensures that the combustion process occurs at the optimal moment, enhancing the engine's explosive power and thermal efficiency, and reducing energy loss.

[0023] Optionally, determining a target charging efficiency and a target ignition angle of the engine based on the ethanol concentration includes: determining the target charging efficiency based on a second mapping relationship and the ethanol concentration. The second mapping relationship is used to represent a mapping relationship between the charging efficiency and the ethanol concentration. Determining the target ignition angle based on a third mapping relationship and the ethanol concentration. The third mapping relationship is used to represent a mapping relationship between the ignition angle and the ethanol concentration.

[0024] As can be seen above, the second mapping relationship represents the relationship between charging efficiency and ethanol concentration, while the third mapping relationship represents the relationship between ignition angle and ethanol concentration. This embodiment uses precise mapping relationships to more accurately determine charging efficiency and ignition angle based on ethanol concentration, enabling the engine control system to more precisely adjust relevant parameters, further improving engine performance.

[0025] Optionally, during engine operation, determining a target air-fuel ratio of the fuel in the engine's fuel tank using a front oxygen signal acquired by a front oxygen sensor includes: acquiring a volume of a fuel tank delivery pipe and a fuel consumption rate during engine operation; determining a consumption time of the fuel in the fuel tank delivery pipe based on the volume of the fuel tank delivery pipe and the fuel consumption rate; and determining the target air-fuel ratio of the fuel in the engine's fuel tank using the front oxygen signal acquired by the front oxygen sensor after the engine has run for the consumption time.

[0026] As can be seen from the above, this embodiment can also clear the fuel in the fuel tank pipeline, preventing the residual fuel of different components or concentrations in the pipeline from affecting the front oxygen signal, ensuring that the obtained front oxygen signal truly reflects the combustion status of the fuel in the current fuel tank, making the determined target air-fuel ratio more accurate, and providing a reliable basis for subsequent adjustments.

[0027] In a second aspect, an engine ignition control device is provided, comprising: a front oxygen sensor for acquiring a front oxygen signal; a processing unit for determining, during engine operation, a target air-fuel ratio of the fuel in the engine's fuel tank based on the front oxygen signal acquired by the front oxygen sensor; the processing unit for determining, based on the target air-fuel ratio, the ethanol concentration of the fuel in the engine's fuel tank; and controlling the engine's ignition operation based on the ethanol concentration.

[0028] Optionally, the processing unit is specifically used to: when the front oxygen signal meets the first preset condition, adjust the engine's intake volume and / or fuel injection volume until the front oxygen signal meets the second preset condition, and determine the target air-fuel ratio of the fuel in the engine's fuel tank; when the front oxygen signal meets the first preset condition, indicate that the actual air-fuel ratio of the engine is not equal to the target air-fuel ratio; when the front oxygen signal meets the second preset condition, indicate that the actual air-fuel ratio of the engine is equal to the target air-fuel ratio.

[0029] Optionally, the first preset condition includes: the voltage value corresponding to the front oxygen signal is greater than a first preset threshold, or the voltage value corresponding to the front oxygen signal is less than a second preset threshold; the second preset condition includes: the voltage value corresponding to the front oxygen signal oscillates between the first preset threshold and the second preset threshold, and the second preset threshold is less than the first preset threshold.

[0030] Optionally, the processing unit is specifically used to: when the voltage value corresponding to the front oxygen signal is greater than or less than a preset threshold, adjust the engine's intake volume and / or fuel injection volume until the voltage value corresponding to the front oxygen signal is equal to the preset threshold, and determine the target air-fuel ratio of the fuel in the engine's fuel tank.

[0031] Optionally, the processing unit is specifically configured to: increase the intake air volume and / or decrease the fuel injection volume when the voltage value corresponding to the front oxygen signal is greater than a preset threshold; and decrease the intake air volume and / or increase the fuel injection volume when the voltage value corresponding to the front oxygen signal is less than a preset threshold.

[0032] Optionally, the processing unit is specifically configured to: obtain an intake air volume and an injection fuel volume of the engine; and determine a target air-fuel ratio based on the intake air volume and the injection fuel volume. The target air-fuel ratio is a ratio of the intake air volume to the injection fuel volume.

[0033] Optionally, the processing unit is specifically configured to determine the ethanol concentration according to the first mapping relationship and the target air-fuel ratio. The first mapping relationship is used to represent a mapping relationship between the ethanol concentration and the air-fuel ratio.

[0034] Optionally, the processing unit is specifically configured to determine a target charging efficiency and a target ignition angle of the engine according to the ethanol concentration, and control an ignition operation of the engine based on the target charging efficiency and the target ignition angle.

[0035] Optionally, the processing unit is specifically configured to determine a target charging efficiency based on a second mapping relationship and an ethanol concentration. The second mapping relationship is configured to represent a mapping relationship between the charging efficiency and the ethanol concentration. Determine a target ignition angle based on a third mapping relationship and the ethanol concentration. The third mapping relationship is configured to represent a mapping relationship between the ignition angle and the ethanol concentration.

[0036] Optionally, the processing unit is specifically configured to: obtain a volume of the fuel tank delivery pipe and a fuel consumption rate during engine operation; determine a consumption time of the fuel in the fuel tank delivery pipe based on the volume of the fuel tank delivery pipe and the fuel consumption rate; and determine a target air-fuel ratio of the fuel in the engine's fuel tank using a front oxygen signal obtained from a front oxygen sensor after the engine has run for the consumption time.

[0037] In a third aspect, an engine ignition control device is provided, comprising: a processor and a memory. The memory is configured to store one or more programs, each of which includes computer-executable instructions. When the engine ignition control device is in operation, the processor executes the computer-executable instructions stored in the memory to implement the method of the first aspect and any possible implementation thereof.

[0038] In a fourth aspect, a computer-readable storage medium is provided. When the computer-executable instructions stored in the computer-readable storage medium are executed by the processor of the engine's ignition control device, the engine's ignition control device can execute the method in the above-mentioned first aspect and any possible implementation method thereof.

[0039] In a fifth aspect, a vehicle is provided, which is used to implement the method described in the first aspect.

[0040] Beneficial effects of this application:

[0041] (1) There is a corresponding relationship between ethanol concentration and ideal air-fuel ratio. In this embodiment, the target air-fuel ratio of the fuel in the engine, i.e., the ideal air-fuel ratio, is detected by the front oxygen signal obtained by the front oxygen sensor. Then, the ethanol concentration of the fuel in the engine tank can be obtained based on the target air-fuel ratio. In this embodiment, there is no need to set up an additional ethanol concentration sensor. The front oxygen signal obtained by the vehicle's original front oxygen sensor can determine the ethanol concentration in the fuel, and then the engine ignition operation can be controlled based on the ethanol concentration. In this way, this embodiment can not only achieve the optimal balance of its combustion efficiency, power output, and emission control, but also reduce costs.

[0042] (2) During engine operation, the oxygen concentration of the exhaust gas discharged by the engine varies under different air-fuel ratios. In the embodiment of the present application, when the front oxygen signal meets the first preset condition, it indicates that the actual air-fuel ratio of the engine is not equal to the target air-fuel ratio. When the front oxygen signal meets the second preset condition, it indicates that the actual air-fuel ratio of the engine is equal to the target air-fuel ratio. In order to achieve the optimal balance between combustion efficiency, power output, and emission control, the air-fuel ratio needs to be at the target air-fuel ratio. Therefore, when the front oxygen signal meets the first preset condition, it is necessary to adjust the engine's intake volume and / or fuel injection volume until the front oxygen signal meets the second preset condition, thereby determining the target air-fuel ratio of the fuel in the engine's fuel tank.

[0043] (3) Different oxygen sensors have different preset conditions. When the front oxygen sensor is a switch-type oxygen sensor, the first preset condition includes: the voltage value corresponding to the front oxygen signal is greater than the first preset threshold, or the voltage value corresponding to the front oxygen signal is less than the second preset threshold; the second preset condition includes: the voltage value corresponding to the front oxygen signal oscillates between the first preset threshold and the second preset threshold; the second preset threshold is less than the first preset threshold.

[0044] (4) To achieve an optimal balance among combustion efficiency, power output, and emission control, the air-fuel ratio must be at the target air-fuel ratio. When the air-fuel ratio is at the target air-fuel ratio, the voltage corresponding to the front oxygen signal is equal to the preset threshold. Therefore, in the process of determining the target air-fuel ratio of the fuel in the engine tank using the front oxygen signal obtained by the front oxygen sensor, the engine's intake volume and / or fuel injection volume can be adjusted according to the relationship between the voltage corresponding to the front oxygen signal and the preset threshold, until the voltage corresponding to the front oxygen signal is equal to the preset threshold, thereby determining the target air-fuel ratio of the fuel in the engine tank.

[0045] (5) The air-fuel ratio is the ratio of the mass of air drawn into the cylinder to the mass of fuel when the engine is operating, that is, the ratio of the intake air volume to the fuel injection volume. In this embodiment, the actual air-fuel ratio can be adjusted by adjusting the intake air volume and / or the fuel injection volume so that the actual air-fuel ratio is equal to the target air-fuel ratio.

[0046] (6) The air-fuel ratio is the ratio of the mass of air sucked into the cylinder to the mass of fuel when the engine is working, that is, the ratio of the intake volume to the injection volume. In the process of continuously adjusting the intake volume and / or injection volume by the front oxygen signal obtained by the front oxygen sensor, the present embodiment can record the intake volume and injection volume. When the voltage value corresponding to the front oxygen signal is equal to the preset threshold value, the target air-fuel ratio can be determined based on the intake volume and injection volume, providing a reliable basis for subsequent adjustment of parameters such as injection volume and ignition timing, thereby achieving precise control of the engine.

[0047] (7) The first mapping relationship is used to represent the mapping relationship between ethanol concentration and air-fuel ratio. That is, this embodiment determines the ethanol concentration through the first mapping relationship and the target air-fuel ratio, eliminating the need for a dedicated ethanol concentration sensor, thereby reducing cost and system complexity.

[0048] (8) Different ethanol concentrations in the fuel affect the intake charge, and different ethanol concentrations result in different optimal ignition angles. This embodiment determines the target charging efficiency and target ignition angle of the engine based on the ethanol concentration, and controls the engine ignition operation based on the target charging efficiency and target ignition angle. This allows the engine to inhale an appropriate amount of air, providing sufficient oxygen for full combustion of the fuel, improving combustion efficiency and power output. It also allows the combustion process to occur at the optimal time, improving the engine's explosive power and thermal efficiency, and reducing energy loss.

[0049] (9) The second mapping relationship is used to represent the mapping relationship between charging efficiency and ethanol concentration, and the third mapping relationship is used to represent the mapping relationship between ignition angle and ethanol concentration. This embodiment can use precise mapping relationships to more accurately determine charging efficiency and ignition angle based on ethanol concentration, allowing the engine control system to more accurately adjust relevant parameters, further improving engine performance.

[0050] (10) This embodiment can also clear the fuel in the fuel tank pipeline to prevent the residual fuel of different components or concentrations in the pipeline from affecting the front oxygen signal, ensuring that the obtained front oxygen signal truly reflects the combustion status of the fuel in the current fuel tank, making the determined target air-fuel ratio more accurate and providing a reliable basis for subsequent adjustments.

[0051] It should be noted that the technical effects brought about by any implementation method in the second to fifth aspects can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here.

[0052] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is a schematic structural diagram of an engine control system according to an embodiment of the present application;

[0054] Figure 2 A flow chart of an engine ignition control method according to an embodiment of the present application;

[0055] Figure 3 This is a flow chart of another engine ignition control method according to an embodiment of the present application;

[0056] Figure 4 This is a flow chart of another engine ignition control method according to an embodiment of the present application;

[0057] Figure 5 A schematic diagram of a working process of an engine control system shown in an embodiment of the present application;

[0058] Figure 6 This is a flow chart of another engine ignition control method according to an embodiment of the present application;

[0059] Figure 7 This is a flow chart of another engine ignition control method according to an embodiment of the present application;

[0060] Figure 8 A schematic diagram of a first mapping relationship shown in an embodiment of the present application;

[0061] Figure 9 This is a flow chart of another engine ignition control method according to an embodiment of the present application;

[0062] Figure 10 A schematic diagram of a third mapping relationship shown in an embodiment of the present application;

[0063] Figure 11 This is a flow chart of another engine ignition control method according to an embodiment of the present application;

[0064] Figure 12 This is a block diagram of an ignition control device for an engine according to an embodiment of the present application;

[0065] Figure 13 This is a block diagram of an engine ignition control device according to an embodiment of the present application. DETAILED DESCRIPTION

[0066] The following will describe the embodiments of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand the other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for the purpose of illustrating the present application and are not intended to limit the scope of protection of the present application.

[0067] It should be noted that in the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being more preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0068] In order to facilitate a clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish between identical or similar items with basically the same functions and effects. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order.

[0069] First, a brief introduction to the application scenarios involved in this application is given.

[0070] As mentioned in the background, in some areas, car users can arbitrarily fill their cars with fuels of varying ethanol concentrations (also known as ethanol content), such as E0 (0% ethanol), E27 (27% ethanol), and E100 (100% ethanol). This causes the ethanol concentration in the fuel tank to randomly vary between 0% and 100%.

[0071] Since the fuel properties of ethanol are different from those of gasoline, fuels with different ethanol concentrations (also called flexible fuels) have different fuel properties. In order to achieve the optimal balance among combustion efficiency, power output, and emission control, fuels with different ethanol concentrations have different corresponding ideal air-fuel ratios (also called theoretical air-fuel ratios), ignition advance angles (ignition angles for short), and charging efficiencies.

[0072] In the related art, in order to ensure stable operation of an engine using flexible fuel, an ethanol concentration sensor is usually provided to detect the ethanol concentration in the fuel, thereby controlling the engine ignition.

[0073] However, the ethanol concentration sensor is in direct contact with the fuel and is easily affected by the fuel, has a limited service life, and the cost of installing the ethanol concentration sensor is high.

[0074] In response to the above problems, an embodiment of the present application provides an engine ignition control method. During engine operation, the front oxygen signal obtained by the front oxygen sensor is used to determine the target air-fuel ratio of the fuel in the engine's fuel tank. Based on the target air-fuel ratio, the ethanol concentration of the fuel in the engine's fuel tank is obtained, and the engine's ignition operation is controlled based on the ethanol concentration.

[0075] As can be seen from the above, due to the corresponding relationship between ethanol concentration and ideal air-fuel ratio, the present invention uses the front oxygen signal obtained by the front oxygen sensor to detect the target air-fuel ratio of the fuel in the engine, namely the ideal air-fuel ratio. Based on the target air-fuel ratio, the ethanol concentration of the fuel in the engine's fuel tank can be calculated. Compared to related technologies, the present invention does not require an additional ethanol concentration sensor. The front oxygen signal obtained by the vehicle's existing front oxygen sensor can determine the ethanol concentration in the fuel, and then control the engine's ignition operation based on the ethanol concentration. In this way, the present invention not only achieves an optimal balance between combustion efficiency, power output, and emission control, but also reduces costs.

[0076] The above engine ignition control method can be applied to engine control systems. Figure 1 A schematic structural diagram of an engine control system provided in an embodiment of the present application is shown.

[0077] like Figure 1 As shown, the engine control system includes: an engine ignition control device 101, a front oxygen sensor 102, an injector 103, and a memory 104.

[0078] The engine ignition control device 101 is connected to the front oxygen sensor 102, the injector 103 and the memory 104 respectively.

[0079] In practical applications, the engine ignition control device 101 may be an electronic control unit (ECU) in a vehicle. The engine ignition control device 101 may also be connected to other sensors in the vehicle to collect information about the operating status of the engine.

[0080] The engine's ignition control device 101 can adjust the actual air-fuel ratio by adjusting the fuel injection amount and / or the intake amount based on the acquired data, so that the actual air-fuel ratio is equal to the target air-fuel ratio, and then determine the target air-fuel ratio and the ethanol concentration corresponding to the target air-fuel ratio, so as to determine the engine's target charging efficiency and target ignition angle based on the ethanol concentration, so as to control the ignition operation of the engine.

[0081] The memory 104 includes a read-only memory and a random access memory.

[0082] In the embodiment of the present application, the memory 104 is used to store the first mapping relationship, the second mapping relationship, the third mapping relationship, and data determined and generated by the engine ignition control device 101 during the process of controlling the ignition operation of the engine.

[0083] The front oxygen sensor 102 is used to quickly detect exhaust gas components in the engine exhaust gas, determine the front oxygen signal, and send the front oxygen signal to the engine ignition control device 101.

[0084] In practical applications, the front oxygen sensor 102 may be a switch-type oxygen sensor or a linear oxygen sensor.

[0085] The fuel injector 103 can inject fuel in response to a control signal output by the ignition control device 101 of the engine.

[0086] Optionally, the engine ignition control device 101 and the memory 104 can be two devices independently provided, or can be integrated into the same device. When the engine ignition control device 101 and the memory 104 are integrated into the same device, the memory 104 can be a storage module of the engine ignition control device 101.

[0087] It is easy to understand that when the engine ignition control device 101 and memory 104 are integrated into the same device, the communication between the engine ignition control device 101 and memory 104 is carried out through internal modules of the device. In this case, the communication process between the two is the same as when the engine ignition control device 101 and memory 104 are independent.

[0088] For ease of understanding, this application uses an example in which the engine's ignition control device 101 and the memory 104 are independent of each other.

[0089] The engine ignition control method provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0090] like Figure 2 As shown, an embodiment of the present application provides an engine ignition control method, the engine ignition control method comprising:

[0091] S201 : During engine operation, determine a target air-fuel ratio of fuel in a fuel tank of the engine using a front oxygen signal obtained by a front oxygen sensor.

[0092] Since the fuel properties of ethanol are different from those of gasoline, after adding fuel to the vehicle's tank (i.e., flexible fuel), it is necessary to determine the ethanol concentration of the fuel in the current engine tank and control the engine ignition operation based on the ethanol concentration.

[0093] In an embodiment of the present application, during the operation of the engine, the engine's ignition control device can perform closed-loop learning through the front oxygen signal, and in the process of closed-loop learning, the actual air-fuel ratio of the fuel gradually approaches the target air-fuel ratio (i.e., the ideal air-fuel ratio) until the actual air-fuel ratio is equal to the target air-fuel ratio (i.e., the excess air coefficient λ = 1), and the target air-fuel ratio of the fuel in the fuel tank can be determined.

[0094] During the closed-loop learning process using the preceding oxygen signal, the target air-fuel ratio is unknown, but the engine's ignition control device can determine the relationship between the actual air-fuel ratio and the target air-fuel ratio based on the preceding oxygen signal. When the actual air-fuel ratio is equal to the target air-fuel ratio, the engine's ignition control device can determine the actual air-fuel ratio based on the intake volume and fuel injection volume recorded during the ignition process, and then determine the target air-fuel ratio.

[0095] S202: Obtain the ethanol concentration of the fuel in the fuel tank of the engine according to the target air-fuel ratio.

[0096] Since there is a corresponding relationship between the ethanol concentration of the fuel and the target air-fuel ratio, the ignition control device of the engine can obtain the ethanol concentration of the fuel in the fuel tank of the engine according to the target air-fuel ratio.

[0097] S203: Control the ignition operation of the engine according to the ethanol concentration.

[0098] Because ethanol and gasoline have significant differences in key properties, such as ethanol's much higher anti-knock resistance, its slower combustion rate, and the air required for ethanol combustion, a higher ethanol concentration in the fuel allows for a wider ignition angle and requires less air.

[0099] After knowing the ethanol concentration, the engine's ignition control device can control the engine's ignition operation according to the ethanol concentration to accurately adjust the ignition parameters to match the current fuel's combustion characteristics, so that the fuel burns more completely, reducing fuel consumption and pollutant emissions.

[0100] As can be seen from the above, the present application can detect the target air-fuel ratio (i.e., ideal air-fuel ratio) of the fuel in the engine using the front oxygen signal acquired by the front oxygen sensor. Based on the target air-fuel ratio, the ethanol concentration of the fuel in the engine's fuel tank can be determined. Compared to related technologies, the present application eliminates the need for an additional ethanol concentration sensor. The front oxygen signal acquired by the vehicle's existing front oxygen sensor can be used to determine the ethanol concentration in the fuel, and the engine's ignition operation can be controlled accordingly. This not only achieves an optimal balance between combustion efficiency, power output, and emission control, but also reduces costs.

[0101] In some embodiments, combined Figure 2 ,like Figure 3 As shown, in the above S201, during the operation of the engine, the target air-fuel ratio of the fuel in the fuel tank of the engine is determined by using the front oxygen signal obtained by the front oxygen sensor, which specifically includes:

[0102] S301. When the front oxygen signal satisfies a first preset condition, adjust the air intake amount and / or fuel injection amount of the engine until the front oxygen signal satisfies a second preset condition, and determine a target air-fuel ratio of the fuel in the engine's fuel tank.

[0103] When the front oxygen signal satisfies the first preset condition, it indicates that the actual air-fuel ratio of the engine is not equal to the target air-fuel ratio.

[0104] When the front oxygen signal satisfies the second preset condition, it indicates that the actual air-fuel ratio of the engine is equal to the target air-fuel ratio.

[0105] For example, when the front oxygen sensor is a switch-type oxygen sensor, the first preset condition includes: the voltage value corresponding to the front oxygen signal is greater than a first preset threshold, or the voltage value corresponding to the front oxygen signal is less than a second preset threshold. The second preset condition includes: the voltage value corresponding to the front oxygen signal oscillates between the first preset threshold and a second preset threshold, wherein the second preset threshold is less than the first preset threshold.

[0106] In another exemplary embodiment, when the front oxygen sensor is a linear oxygen sensor, the first preset condition includes: the voltage value corresponding to the front oxygen signal is greater than or equal to the preset threshold; the second preset condition includes: the voltage value corresponding to the front oxygen signal is equal to the preset threshold.

[0107] In some embodiments, the oxygen sensor is a linear oxygen sensor, for example, combined with Figure 3 ,like Figure 4 As shown, in the above S301, when the front oxygen signal meets the first preset condition, the engine's intake amount and / or fuel injection amount is adjusted until the front oxygen signal meets the second preset condition, and the target air-fuel ratio of the fuel in the engine's fuel tank is determined.

[0108] S401. When the voltage value corresponding to the front oxygen signal is greater than or less than a preset threshold, adjust the engine's intake volume and / or fuel injection volume until the voltage value corresponding to the front oxygen signal is equal to the preset threshold, and determine a target air-fuel ratio of the fuel in the engine's fuel tank.

[0109] In this embodiment, the voltage value corresponding to the front oxygen signal is greater than the preset threshold value, indicating that the oxygen concentration in the exhaust gas is low and the concentration of the mixture (i.e., the mixture produced by incomplete combustion of the fuel) is high, indicating that the fuel is not fully burned and the actual air-fuel ratio is small. It is necessary to increase the actual air-fuel ratio so that the actual air-fuel ratio approaches the target air-fuel ratio.

[0110] Correspondingly, the voltage value corresponding to the front oxygen signal is less than the preset threshold, indicating that the oxygen concentration in the exhaust gas is high and the mixture concentration is low, indicating that the fuel is fully burned, and there is too little fuel, and a large amount of air does not participate in the reaction. It is necessary to reduce the actual air-fuel ratio so that the actual air-fuel ratio is close to the target air-fuel ratio.

[0111] The air-fuel ratio is the ratio of the mass of air drawn into the cylinder to the mass of fuel during engine operation, that is, the ratio of the intake air volume to the amount of fuel injected. To increase the air-fuel ratio, you need to increase the intake air volume and / or reduce the amount of fuel injected. To decrease the air-fuel ratio, you need to reduce the intake air volume and / or increase the amount of fuel injected.

[0112] When the voltage value corresponding to the front oxygen signal is greater than or less than a preset threshold, the engine's intake air volume and / or fuel injection volume are adjusted, specifically including:

[0113] S4011: When the voltage value corresponding to the front oxygen signal is greater than a preset threshold, increase the intake air volume and / or reduce the fuel injection volume.

[0114] S4012: When the voltage value corresponding to the front oxygen signal is less than a preset threshold, reduce the intake air volume and / or increase the fuel injection volume.

[0115] In other embodiments, taking the front oxygen sensor as a switch-type oxygen sensor as an example, when the voltage value corresponding to the front oxygen signal is greater than a first preset threshold, or when the voltage value corresponding to the front oxygen signal is less than a second preset threshold, the engine's intake air volume and / or fuel injection volume is adjusted until the voltage value corresponding to the front oxygen signal oscillates between the first preset threshold and the second preset threshold.

[0116] Specifically, when the voltage value corresponding to the front oxygen signal is greater than a first preset threshold, the intake air volume is increased and / or the fuel injection volume is reduced. When the voltage value corresponding to the front oxygen signal is less than a second preset threshold, the intake air volume is reduced and / or the fuel injection volume is increased.

[0117] In some embodiments, in the engine control system, the front oxygen signal obtained by the front oxygen sensor is used to adjust the fuel injection amount of the engine. The working process of the engine control system is as follows: Figure 5 shown.

[0118] The front oxygen sensor detects the oxygen concentration in the exhaust gas, generates a front oxygen signal, and transmits it to the engine's ignition control unit. The engine's ignition control unit controls the fuel injection quantity, thereby adjusting the actual air-fuel ratio to equal the target air-fuel ratio. The injector responds to the engine's ignition control unit's control, adjusting the fuel injection quantity, and the engine then combusts and expel exhaust gas. The front oxygen sensor then detects the oxygen concentration in the exhaust gas, continuing the cycle until the actual air-fuel ratio equals the target air-fuel ratio.

[0119] In practical applications, the engine's ignition control device can control the fuel injection amount by controlling the injection pulse width of the injector based on the front oxygen signal.

[0120] In actual applications, the car can be filled with E27 fuel with an ethanol concentration of 27% when it leaves the factory, and the first closed-loop learning is performed until the actual air-fuel ratio is equal to the target air-fuel ratio of 13.05. The front oxygen signal is recorded, and the voltage value corresponding to the front oxygen signal is used as the preset threshold.

[0121] In addition, the engine's ignition control device can use the ignition angle, charging efficiency, and target air-fuel ratio determined in the first closed-loop learning process as initial learning values, and use them as preset ignition angle, preset charging efficiency, and preset air-fuel ratio in the second closed-loop learning to control the engine's ignition operation.

[0122] This cycle repeats, and when closed-loop learning is performed subsequently, the learning value of the previous closed-loop learning is used as the preset value for this cycle to control the ignition operation of the engine.

[0123] For example, if the target air-fuel ratio determined in the last closed-loop learning is 9.4 and the ignition angle is 5 degrees, then during this cycle, 9.4 is used as the preset air-fuel ratio and 5 is used as the preset air-fuel ratio to control the ignition operation of the engine, and the front oxygen signal is obtained. According to the voltage value corresponding to the front oxygen signal, the intake volume and / or fuel injection volume are adjusted until the voltage value corresponding to the front oxygen signal is equal to the preset voltage value, and the target air-fuel ratio is determined.

[0124] In some embodiments, combined Figure 4 ,like Figure 6 As shown, in the above S401, determining the target air-fuel ratio of the fuel in the engine tank specifically includes:

[0125] S601: Obtain the air intake and fuel injection volume of the engine.

[0126] S602: Determine a target air-fuel ratio based on the intake air amount and the fuel injection amount.

[0127] The target air-fuel ratio is the ratio of the intake air amount to the fuel injection amount.

[0128] Since the air-fuel ratio is the ratio of the mass of air inhaled into the cylinder to the mass of fuel when the engine is working, after determining the current actual air-fuel ratio, that is, the target air-fuel ratio, the engine's intake volume and fuel injection volume can be obtained, and the target air-fuel ratio can be determined based on the intake volume and fuel injection volume.

[0129] In this embodiment, in the process of adjusting the intake volume and / or fuel injection volume by the voltage value corresponding to the front oxygen signal, the engine's ignition control device can record the intake volume and fuel injection volume. When the voltage value corresponding to the front oxygen signal is equal to the preset threshold, the target air-fuel ratio can be determined based on the intake volume and fuel injection volume.

[0130] In some embodiments, combined Figure 2 ,like Figure 7 As shown, in the above S202, the ethanol concentration of the fuel in the fuel tank of the engine is obtained according to the target air-fuel ratio, which specifically includes:

[0131] S701: Determine an ethanol concentration according to a first mapping relationship and a target air-fuel ratio.

[0132] The first mapping relationship is used to represent the mapping relationship between ethanol concentration and air-fuel ratio.

[0133] The first mapping relationship diagram is as follows Figure 8 As shown, the horizontal axis represents the ethanol concentration, and the vertical axis represents the target air-fuel ratio.

[0134] Depend on Figure 8 It can be seen that different ethanol concentrations correspond to different target air-fuel ratios. That is, after determining the target air-fuel ratio, the engine ignition control device can find the ethanol concentration corresponding to the target air-fuel ratio in the first mapping diagram based on the target air-fuel ratio.

[0135] For example, Figure 8 It can be seen that when the target air-fuel ratio is equal to 9.4, the ethanol concentration is 84%. Figure 7 ,like Figure 9 As shown, in the above S203, the ignition operation of the engine is controlled according to the ethanol concentration, specifically including:

[0136] S901: Determine a target charging efficiency and a target ignition angle of the engine according to the ethanol concentration.

[0137] According to the ethanol concentration, the target charging efficiency and target ignition angle of the engine are determined, including:

[0138] S9011. Determine a target charging efficiency based on the second mapping relationship and the ethanol concentration.

[0139] The second mapping relationship is used to represent the mapping relationship between the charging efficiency and the ethanol concentration.

[0140] S9012: Determine a target ignition angle according to the third mapping relationship and the ethanol concentration.

[0141] The third mapping relationship is used to represent the mapping relationship between the ignition angle and the ethanol concentration.

[0142] The third mapping relationship diagram is as follows Figure 10 As shown, the horizontal axis represents the ethanol concentration, and the vertical axis represents the target ignition angle.

[0143] Depend on Figure 10 It can be seen that different ethanol concentrations correspond to different target ignition angles. After determining the ethanol concentration of the fuel, the engine ignition control device can find the target ignition angle corresponding to the ethanol concentration in the third mapping relationship diagram based on the ethanol concentration.

[0144] S902: Control the ignition operation of the engine based on the target charging efficiency and the target ignition angle.

[0145] In this embodiment, the engine's ignition control device can more accurately determine the charging efficiency and ignition angle according to the ethanol concentration through a precise mapping relationship, so that the engine control system can more accurately adjust the relevant parameters and further improve the engine performance.

[0146] Optionally, during engine operation, in order to ensure that the engine is in a stable charging condition, it is necessary to determine whether the power battery (state of charge, SOC) in the vehicle is less than the power threshold. Only when the power battery is less than the power threshold can the steady-state charging condition be started.

[0147] For example, the battery threshold can be set to 80%.

[0148] The steady-state charging condition can be set according to the current vehicle speed, with different speeds and torques.

[0149] Exemplarily, the engine operates stably at a speed of 1200 rpm and a torque of 40 Nm to generate electricity.

[0150] Optionally, during engine operation, determining a target air-fuel ratio of the fuel in the engine's fuel tank using a front oxygen signal obtained by a front oxygen sensor includes:

[0151] During engine operation, obtain the volume of the fuel tank delivery pipe and the fuel consumption rate.

[0152] Determine the consumption time of the fuel in the fuel tank delivery line based on the volume of the fuel tank delivery line and the fuel consumption rate.

[0153] After the engine runs for an expiring time, a target air-fuel ratio of the fuel in the fuel tank of the engine is determined by a front oxygen signal obtained by the front oxygen sensor.

[0154] For example, if the engine's ignition control device detects that the fuel consumption rate during engine operation is 1.9L / h and the volume of the fuel tank pipe is 0.115L, the fuel consumption time in the fuel tank pipe is approximately 218s. The engine's ignition control device can determine that the consumption time is 220s. After the engine runs for 220s, the target air-fuel ratio of the fuel in the engine's fuel tank is determined by the front oxygen signal obtained by the front oxygen sensor.

[0155] In order to prevent the residual fuel of different components or concentrations in the fuel pipe from affecting the front oxygen signal, it is necessary to ensure that the obtained front oxygen signal truly reflects the combustion status of the fuel in the current fuel tank. Therefore, before obtaining the front oxygen signal, the original fuel in the fuel tank pipeline can be consumed through the above process.

[0156] In summary of the above embodiments, the ignition control device of the engine can be Figure 11 The flow chart shown determines the ethanol concentration of the fuel in the tank and determines the target charging efficiency and target ignition angle.

[0157] After the vehicle is powered on, if a change in the fuel tank oil level is detected, it can be determined whether the power level of the power battery is less than the power threshold, that is, whether the engine start-up stable charging condition is met.

[0158] When the power battery's charge level is lower than the charge threshold, the steady-state charging condition is initiated, and the charging efficiency, air-fuel ratio, and ignition angle determined by the last closed-loop learning are used until the raw fuel in the fuel tank's fuel pipeline is consumed.

[0159] Alternatively, if the power battery charge is greater than or equal to the charge threshold, the vehicle can wait for pure electric driving until the charge falls below the charge threshold. Steady-state charging is initiated, and the charging efficiency, air-fuel ratio, and ignition angle determined by the previous closed-loop learning are used until the raw fuel in the fuel tank pipeline is consumed.

[0160] Then, the steady-state charging condition is maintained, and the engine intake air volume and / or fuel injection volume are adjusted according to the front oxygen signal until the voltage value corresponding to the front oxygen signal is equal to the preset threshold value and the actual air-fuel ratio is equal to the target air-fuel ratio, thereby determining the target air-fuel ratio.

[0161] Next, the ethanol concentration of the fuel in the engine's fuel tank is obtained based on the target air-fuel ratio.

[0162] Next, the target charging efficiency and target ignition angle of the engine are determined based on the ethanol concentration.

[0163] As can be seen from the above, after detecting that the vehicle is refueling, the stable charging condition is started, and the fuel closed-loop learning is performed according to the front oxygen signal of the front oxygen sensor under the stable charging condition to obtain the ethanol concentration of the fuel in the tank. Then, the corresponding ignition angle and injection amount are selected according to the ethanol concentration to achieve the optimal balance of fuel combustion efficiency, power output and emission control.

[0164] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of method. In order to realize the above functions, the ignition control device of the engine includes hardware structures and / or software modules corresponding to the execution of each function. It should be easy for those skilled in the art to realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0165] In the embodiment of the present application, the engine ignition control device can be divided into functional modules according to the above method. For example, the engine ignition control device can include functional modules corresponding to the functional divisions, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical functional division. In actual implementation, other division methods may be used.

[0166] Figure 12 FIG. 1 is a block diagram of an ignition control device for an engine according to an exemplary embodiment. Figure 12 The engine ignition control device includes a front oxygen sensor 1201 for acquiring a front oxygen signal. A processing unit 1202 is configured to determine a target air-fuel ratio of the fuel in the engine's fuel tank based on the front oxygen signal acquired by the front oxygen sensor during engine operation. Processing unit 1202 is further configured to determine the ethanol concentration of the fuel in the engine's fuel tank based on the target air-fuel ratio. Processing unit 1202 is further configured to control engine ignition based on the ethanol concentration.

[0167] Optionally, the processing unit 1202 is specifically used to: when the front oxygen signal meets the first preset condition, adjust the engine's intake volume and / or fuel injection volume until the front oxygen signal meets the second preset condition, and determine the target air-fuel ratio of the fuel in the engine's fuel tank; when the front oxygen signal meets the first preset condition, indicate that the actual air-fuel ratio of the engine is not equal to the target air-fuel ratio; when the front oxygen signal meets the second preset condition, indicate that the actual air-fuel ratio of the engine is equal to the target air-fuel ratio.

[0168] Optionally, the first preset condition includes: the voltage value corresponding to the front oxygen signal is greater than a first preset threshold, or the voltage value corresponding to the front oxygen signal is less than a second preset threshold; the second preset condition includes: the voltage value corresponding to the front oxygen signal oscillates between the first preset threshold and the second preset threshold, and the second preset threshold is less than the first preset threshold.

[0169] Optionally, the processing unit 1202 is specifically used to: when the voltage value corresponding to the front oxygen signal is greater than or less than a preset threshold, adjust the engine's intake volume and / or fuel injection volume until the voltage value corresponding to the front oxygen signal is equal to the preset threshold, and determine the target air-fuel ratio of the fuel in the engine's fuel tank.

[0170] Optionally, the processing unit 1202 is specifically configured to: increase the intake air volume and / or decrease the fuel injection volume if the voltage value corresponding to the front oxygen signal is greater than a preset threshold; and decrease the intake air volume and / or increase the fuel injection volume if the voltage value corresponding to the front oxygen signal is less than a preset threshold.

[0171] Optionally, the processing unit 1202 is specifically configured to: obtain an intake air volume and an injection fuel volume of the engine, and determine a target air-fuel ratio based on the intake air volume and the injection fuel volume. The target air-fuel ratio is the ratio of the intake air volume to the injection fuel volume.

[0172] Optionally, the processing unit 1202 is specifically configured to determine the ethanol concentration according to the first mapping relationship and the target air-fuel ratio. The first mapping relationship is used to represent a mapping relationship between the ethanol concentration and the air-fuel ratio.

[0173] Optionally, the processing unit 1202 is specifically configured to determine a target charging efficiency and a target ignition angle of the engine according to the ethanol concentration, and control an ignition operation of the engine based on the target charging efficiency and the target ignition angle.

[0174] Optionally, processing unit 1202 is specifically configured to determine a target charging efficiency based on a second mapping relationship and an ethanol concentration. The second mapping relationship is used to represent a mapping relationship between the charging efficiency and the ethanol concentration. Determine a target ignition angle based on a third mapping relationship and the ethanol concentration. The third mapping relationship is used to represent a mapping relationship between the ignition angle and the ethanol concentration.

[0175] Optionally, processing unit 1202 is specifically configured to: obtain a volume of a fuel tank delivery pipe and a fuel consumption rate during engine operation; determine a consumption time of the fuel in the fuel tank delivery pipe based on the volume of the fuel tank delivery pipe and the fuel consumption rate; and determine a target air-fuel ratio of the fuel in the engine's fuel tank using a front oxygen signal obtained from a front oxygen sensor after the engine has run for the consumption time.

[0176] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0177] Figure 13 FIG. 1 is a block diagram of an ignition control device for an engine according to an exemplary embodiment. Figure 7 As shown, the ignition control device of the engine includes but is not limited to: a processor 1301 and a memory 1302 .

[0178] The memory 1302 is used to store executable instructions of the processor 1301. It is understandable that the processor 1301 is configured to execute instructions to implement the engine ignition control method in the above embodiment.

[0179] It should be noted that those skilled in the art can understand that Figure 13 The structure of the ignition control device of the engine shown in the figure does not constitute a limitation on the ignition control device of the engine. The ignition control device of the engine may include Figure 13More or fewer components may be shown, or certain components may be combined, or the components may be arranged differently.

[0180] Processor 1301 is the control center of the engine's ignition control system. It connects various components of the entire engine's ignition control system using various interfaces and circuits. By running or executing software programs and / or modules stored in memory 1302 and accessing data stored in memory 1302, it performs various functions of the engine's ignition control system and processes data, thereby providing overall monitoring of the engine's ignition control system. Processor 1301 may include one or more processing units.

[0181] Optionally, the processor 1301 may integrate an application processor and a modem processor, wherein the application processor primarily processes the operating system, user interface, and application programs, and the modem processor primarily processes wireless communications. It is understood that the modem processor may not be integrated into the processor 1301.

[0182] Memory 1302 can be used to store software programs and various data. Memory 1302 may primarily include a program storage area and a data storage area. The program storage area may store an operating system and application programs required by at least one functional module (e.g., a determination unit, a processing unit, etc.). Furthermore, memory 1302 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0183] In an exemplary embodiment, a computer-readable storage medium including instructions is further provided, such as a memory 1302 including instructions. The instructions can be executed by the processor 1301 of the vehicle-mounted device to implement the method in the above embodiment.

[0184] In actual implementation, Figure 12 The functions of the front oxygen sensor 1201 and the processing unit 1202 can be controlled by Figure 13 The processor 1301 in the embodiment calls the computer program stored in the memory 1302. The specific execution process can be referred to the description of the method part in the above embodiment, which will not be repeated here.

[0185] Optionally, the computer-readable storage medium may be a non-temporary computer-readable storage medium, for example, the non-temporary computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0186] In an exemplary embodiment, the present invention further provides a computer program product comprising one or more instructions, which can be executed by the processor 1301 of the ignition control device of the engine to implement the method in the above embodiment.

[0187] It should be noted that when the instructions in the above-mentioned computer-readable storage medium or one or more instructions in the computer program product are executed by the processor of the vehicle-mounted device, the various processes of the above-mentioned method embodiment are implemented and the same technical effect as the above-mentioned method can be achieved. To avoid repetition, they will not be repeated here.

[0188] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete the full classification or partial functions described above.

[0189] In the several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0190] The units described as separate components may or may not be physically separate, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0191] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0192] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present invention, or the part that contributes to the prior art, or the entire classification part or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes a number of instructions for enabling a device (which can be a single-chip microcomputer, chip, etc.) or a processor to execute the entire classification part or part of the steps of the method of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, ROM, RAM, disk or optical disk, etc., various media that can store program code.

[0193] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. An engine ignition control method, characterized in that: The method comprises: During the operation of the engine, determining a target air-fuel ratio of the fuel in the fuel tank of the engine by using a front oxygen signal obtained by a front oxygen sensor; obtaining an ethanol concentration of the fuel in the fuel tank of the engine according to the target air-fuel ratio; An ignition operation of the engine is controlled based on the ethanol concentration.

2. The method according to claim 1, characterized in that The determining of a target air-fuel ratio of the fuel in the fuel tank of the engine by using the front oxygen signal obtained by the front oxygen sensor includes: When the front oxygen signal satisfies a first preset condition, the intake amount and / or fuel injection amount of the engine is adjusted until the front oxygen signal satisfies a second preset condition, and the target air-fuel ratio of the fuel in the fuel tank of the engine is determined; when the front oxygen signal satisfies the first preset condition, it indicates that the actual air-fuel ratio of the engine is not equal to the target air-fuel ratio; when the front oxygen signal satisfies the second preset condition, it indicates that the actual air-fuel ratio of the engine is equal to the target air-fuel ratio.

3. The method according to claim 2, characterized in that The first preset condition includes: the voltage value corresponding to the front oxygen signal is greater than a first preset threshold, or the voltage value corresponding to the front oxygen signal is less than a second preset threshold; the second preset condition includes: the voltage value corresponding to the front oxygen signal oscillates between the first preset threshold and the second preset threshold; the second preset threshold is less than the first preset threshold.

4. The method according to claim 2, characterized in that When the front oxygen signal satisfies a first preset condition, adjusting the intake air amount and / or fuel injection amount of the engine until the front oxygen signal satisfies a second preset condition, and determining the target air-fuel ratio of the fuel in the fuel tank of the engine, includes: When the voltage value corresponding to the front oxygen signal is greater than or less than a preset threshold, the intake amount and / or fuel injection amount of the engine is adjusted until the voltage value corresponding to the front oxygen signal is equal to the preset threshold, and the target air-fuel ratio of the fuel in the engine's fuel tank is determined.

5. The method according to claim 4, characterized in that When the voltage value corresponding to the front oxygen signal is greater than or less than a preset threshold, adjusting the air intake amount and / or fuel injection amount of the engine includes: When the voltage value corresponding to the front oxygen signal is greater than the preset threshold, increasing the intake air amount and / or reducing the fuel injection amount; When the voltage value corresponding to the front oxygen signal is less than the preset threshold, the intake air amount is reduced and / or the fuel injection amount is increased.

6. The method according to claim 4, characterized in that The determining the target air-fuel ratio of the fuel in the fuel tank of the engine includes: Obtaining the air intake and fuel injection amount of the engine; The target air-fuel ratio is determined according to the intake air amount and the fuel injection amount; the target air-fuel ratio is the ratio of the intake air amount to the fuel injection amount.

7. The method according to claim 1, characterized in that The step of obtaining the ethanol concentration of the fuel in the fuel tank of the engine according to the target air-fuel ratio includes: The ethanol concentration is determined according to a first mapping relationship and the target air-fuel ratio; the first mapping relationship is used to represent a mapping relationship between the ethanol concentration and the air-fuel ratio.

8. The method according to claim 1, characterized in that The controlling of the ignition operation of the engine according to the ethanol concentration includes: determining a target charging efficiency and a target ignition angle of the engine according to the ethanol concentration; An ignition operation of the engine is controlled based on the target charging efficiency and the target ignition angle.

9. The method according to claim 8, characterized in that Determining the target charging efficiency and target ignition angle of the engine according to the ethanol concentration includes: determining the target charging efficiency according to a second mapping relationship and the ethanol concentration; wherein the second mapping relationship is used to represent a mapping relationship between the charging efficiency and the ethanol concentration; The target ignition angle is determined according to a third mapping relationship and the ethanol concentration; the third mapping relationship is used to represent a mapping relationship between the ignition angle and the ethanol concentration.

10. The method according to claim 1, characterized in that Determining a target air-fuel ratio of fuel in a fuel tank of the engine by using a front oxygen signal obtained by a front oxygen sensor during operation of the engine includes: During the operation of the engine, obtaining the volume of the fuel tank oil pipe and the fuel consumption rate; determining a consumption time of the fuel in the fuel tank delivery pipe according to the volume of the fuel tank delivery pipe and the fuel consumption rate; After the engine runs for the consumption time, a target air-fuel ratio of the fuel in the fuel tank of the engine is determined by using a front oxygen signal obtained by a front oxygen sensor.

11. An ignition control device for an engine, characterized in that: include: Front oxygen sensor, used to obtain front oxygen signal; a processing unit, configured to determine a target air-fuel ratio of the fuel in the fuel tank of the engine using a front oxygen signal obtained by a front oxygen sensor during operation of the engine; obtaining an ethanol concentration of the fuel in the fuel tank of the engine according to the target air-fuel ratio; An ignition operation of the engine is controlled based on the ethanol concentration.

12. A vehicle, characterized in that: The vehicle is used to implement the method according to any one of claims 1 to 10.

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