Vehicle air-fuel ratio adjustment method and device, electronic equipment, storage medium and vehicle

Abstract

The application provides a vehicle air-fuel ratio adjusting method and device, electronic equipment, a storage medium and a vehicle. The method comprises the following steps: detecting lean NO x In the case that the temperature corresponding to the trap is in a preset temperature range and the accelerator pedal opening degree is detected to increase, the current engine torque and the state of charge of the power battery are acquired, and the power target torque is determined. If the state of charge is greater than a preset threshold, the difference between the power target torque and the current engine torque is taken as the target output torque, the power battery is powered to the motor to make the motor output the target output torque. If the state of charge is not greater than the preset threshold, the fuel injection amount of the engine is increased, the engine is controlled to increase from the current engine torque to the power target torque, and the engine is controlled to charge the power battery, so that the air-fuel ratio of the engine is reduced from the first air-fuel ratio to the second air-fuel ratio. Through the technical scheme, the nitrous oxide emission is reduced during the acceleration of the vehicle, and the pollution to the environment is reduced.

Description

Technical Field

[0001] This application relates to the field of vehicle power technology, and in particular to a method, device, electronic equipment, storage medium and vehicle for adjusting the air-fuel ratio of a vehicle. Background Technology

[0002] Hybrid electric vehicles, as a new type of automotive product, can both reduce fuel consumption and emissions. Currently, lean-burn NOx... X Lean NO X Traps (LNTs) are one of the cutting-edge after-treatment technologies in the automotive industry.

[0003] However, due to the NO emitted by the engine X NO accounts for over 90% of emissions, and NO emissions into lean combustion systems... X CO and NO in the trap will be released in lean NO. X The presence of precious metals Pt and Rh inside the filter generates a certain amount of N2O, leading to increased N2O emissions. Furthermore, increased torque demands in vehicles cause significant fluctuations in the engine's air-fuel ratio, which also produces substantial amounts of N2O. Since the greenhouse effect of N2O is more than 310 times that of CO2, it causes significant environmental pollution. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a method, device, electronic device, storage medium and vehicle for adjusting the air-fuel ratio of a vehicle, so as to reduce the emission of nitrous oxide and reduce the pollution to the environment when the vehicle torque increases.

[0005] To achieve the above objectives, this application provides a method for adjusting the air-fuel ratio of a vehicle, the method comprising:

[0006] After detecting lean NO x When the temperature of the trap is within the preset temperature range and an increase in the accelerator pedal opening is detected, the current engine torque and the state of charge of the power battery are obtained, and the target torque is determined.

[0007] If the state of charge is greater than a preset threshold, the difference between the target power torque and the current engine torque is taken as the target output torque, and the power battery supplies power to the electric motor so that the electric motor outputs the target output torque;

[0008] if the state of charge is not greater than the preset threshold, increasing the fuel injection amount of the engine, controlling the engine to increase from the current engine torque to the power target torque, and controlling the engine to charge the power battery, so that the air-fuel ratio of the engine decreases from a first air-fuel ratio to a second air-fuel ratio; wherein the first air-fuel ratio is an air-fuel ratio when the engine is in a lean combustion state, and the second air-fuel ratio is an air-fuel ratio when the engine is in a rich combustion state.

[0009] To achieve the above object, the present application provides a vehicle air-fuel ratio adjusting device, which comprises:

[0010] an information acquisition module, configured to acquire the current engine torque and the state of charge of the power battery when it is detected that the lean NOx trap is in the lean NOx trap state and the temperature of the lean NOx trap is in a preset temperature range and the accelerator pedal opening degree is increased; x a high state of charge processing module, configured to, if the state of charge is greater than the preset threshold, take the difference between the power target torque and the current engine torque as a target output torque, and supply power to the motor through the power battery so that the motor outputs the target output torque;

[0011] a high state of charge processing module, configured to, if the state of charge is greater than the preset threshold, take the difference between the power target torque and the current engine torque as a target output torque, and supply power to the motor through the power battery so that the motor outputs the target output torque;

[0012] a low state of charge processing module, configured to, if the state of charge is not greater than the preset threshold, increase the fuel injection amount of the engine, control the engine to increase from the current engine torque to the power target torque, and control the engine to charge the power battery, so that the air-fuel ratio of the engine decreases from a first air-fuel ratio to a second air-fuel ratio; wherein the first air-fuel ratio is an air-fuel ratio when the engine is in a lean combustion state, and the second air-fuel ratio is an air-fuel ratio when the engine is in a rich combustion state.

[0013] To achieve the above object, the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the vehicle air-fuel ratio adjusting method provided in any of the embodiments of the present application.

[0014] To achieve the above object, the present application provides a computer readable storage medium, which stores computer instructions for causing a computer to execute the vehicle air-fuel ratio adjusting method provided in any of the embodiments of the present application.

[0015] To achieve the above object, the present application provides a vehicle, characterized in comprising the vehicle air-fuel ratio adjusting device provided in any of the embodiments of the present application or the electronic device provided in any of the embodiments of the present application.

[0016] From the above, the vehicle air-fuel ratio adjustment method provided by the application can reduce the emission of nitrous oxide when the engine torque increases, and reduce the pollution to the environment. x In the case that the temperature corresponding to the trap is in the preset temperature range and the opening of the accelerator pedal is increased, the current engine torque and the power target torque are determined, and the increasing mode of the vehicle torque is determined according to the state of charge of the power battery. If the state of charge is greater than a preset threshold, the difference between the power target torque and the current engine torque is taken as the target output torque, and the power battery is powered to the motor to make the motor output the target output torque, so as to achieve the purpose of increasing the vehicle torque and avoid excessive emission of nitrous oxide caused by increasing the fuel injection amount. If the state of charge is not greater than the preset threshold, the fuel injection amount of the engine is increased to control the engine to increase from the current engine torque to the power target torque, and the engine is controlled to charge the power battery, so that the air-fuel ratio of the engine decreases from the first air-fuel ratio to the second air-fuel ratio, thereby achieving the purpose of sudden reduction of the air-fuel ratio and greatly reducing the emission of nitrous oxide. Through the above mode, the emission of nitrous oxide is reduced when the vehicle torque increases, and the pollution to the environment is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the application or related art, the drawings needed in the embodiments or related art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 A flowchart of a vehicle air-fuel ratio adjustment method provided by an embodiment of the application;

[0019] Figure 2 A flowchart of another vehicle air-fuel ratio adjustment method provided by an embodiment of the application;

[0020] Figure 3 A structural schematic diagram of a vehicle air-fuel ratio adjustment device provided by an embodiment of the application;

[0021] Figure 4 An electronic device hardware structure schematic diagram provided by an embodiment of the application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the application more clear, the application will be further described in detail below with reference to specific embodiments and drawings.

[0023] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] Figure 1 This application provides a flowchart of a vehicle air-fuel ratio adjustment method, primarily applicable to situations where nitrogen oxide emissions are reduced when a vehicle increases torque by pressing the accelerator. This method can be executed by a vehicle air-fuel ratio adjustment device, which can be implemented in software and / or hardware and can be configured in an electronic device. Figure 1 As shown, the method may specifically include the following steps:

[0025] S110, upon detecting lean NO... x When the temperature of the trap is within the preset temperature range and an increase in the accelerator pedal opening is detected, the current engine torque and the state of charge of the power battery are obtained, and the target torque is determined.

[0026] The preset temperature range could be due to lean-burn NO caused by increased accelerator pedal opening. x The temperature range within the filter where the chemical reaction produces a large amount of nitrous oxide is specifically set based on the temperature required for the chemical reaction and the nitrous oxide emission requirements. The current engine torque can be set to meet the lean-burn NO emission standards. x The engine torque is measured when the temperature corresponding to the filter is within a preset temperature range and the accelerator pedal opening is increased. State of charge (SCC) refers to the percentage of charge currently held by the battery, which can be understood as the ratio of its current capacity to the total battery capacity, usually expressed as a percentage. Target torque is the torque the engine needs to achieve after the accelerator pedal opening is increased.

[0027] Specifically, by installing in lean NO x High-temperature sensors before and / or after the trap determine lean NO. xThe internal temperature of the trap is determined whether it is in a preset temperature range. Further, the current engine torque can be obtained when the internal temperature is in the preset temperature range and the accelerator pedal opening degree increases, and the state of charge of the power battery can be obtained according to the battery system, and the power target torque can also be determined according to the increase degree of the accelerator.

[0028] It should be noted that the NO x x in the exhaust gas discharged from the engine combustion chamber accounts for more than 90%, and the engine in the condition of increasing the accelerator pedal will cause the engine to be in a rich combustion state. In this case, the CO and NO x x in the trap will be discharged to the lean NO x x will be generated under the action of the noble metal Pt (platinum) and Rh (rhodium) in the trap, and the reaction formula is: 2NO+CO→N2O+CO2. Since the exhaust gas of the engine flows to the lean NO x x in the trap is 200-400℃, therefore, the preset temperature range can be 200-400℃; optionally, if the emission amount of N2O does not need to be strictly controlled, the preset temperature range can be appropriately reduced.

[0029] It should also be noted that according to independent research, when the accelerator pedal is suddenly increased, for example, in a lean hybrid engine, the air-fuel ratio changes between 29.4:1 and 13.2:1. Although there is no special accurate rule, there is a clear trend of air-fuel ratio decrease.

[0030] Through experiments, it is verified that when the air-fuel ratio is appropriately increased, the N2O concentration basically increases from 0PPM (parts per million) to about 80PPM when the air-fuel ratio changes rapidly from 29.4:1 to 23.5:1, and the duration is about 60 seconds. Further, when the air-fuel ratio is appropriately increased, the N2O emission decreases, and the N2O concentration basically decreases to 40PPM when the air-fuel ratio changes rapidly from 17.6:1 to 16.2:1, and the duration is only a few seconds. When the air-fuel ratio changes rapidly from 16.2:1 to 13.2:1, the N2O emission further decreases.

[0031] Therefore, the lean NO x x in the trap will increase sharply when the engine air-fuel ratio changes suddenly within the preset temperature range. When the engine air-fuel ratio changes from a lean state to a rich state, it is the main working condition for generating N2O. However, when the engine air-fuel ratio is less than or equal to the second air-fuel ratio, such as 14.7:1, the N2O emission amount will be very small, and the subsequent S120-S130 can be performed accordingly to reduce the N2O emission amount.

[0032] S120, if the state of charge is greater than the preset threshold, a difference between the power target torque and the current engine torque is taken as the target output torque, and the power battery is powered to make the electric motor output the target output torque.

[0033] The preset threshold can be a minimum value of the state of charge that the power battery can support for torque output, and can be set according to the needs of different enterprises or different vehicle models, for example, can be 15% or the like. The target output torque is a difference between the power target torque and the current engine torque, that is, the torque that needs to be supplemented by the power battery.

[0034] Specifically, if the state of charge is greater than the preset threshold, it indicates that the torque required by the increase of the accelerator pedal opening degree can be supplemented by the power battery, and the engine does not need to be controlled to increase fuel to increase the torque. Therefore, the difference between the power target torque and the current engine torque can be determined as the target output torque, that is, the torque supplemented by the power battery, and accordingly, the power battery can be controlled to power the electric motor, so that the electric motor outputs the target output torque to reach the power target torque together with the current engine torque.

[0035] S130, if the state of charge is not greater than the preset threshold, the fuel injection amount of the engine is increased, the engine is controlled to increase from the current engine torque to the power target torque, and the engine is controlled to charge the power battery, so that the air-fuel ratio of the engine decreases from the first air-fuel ratio to the second air-fuel ratio.

[0036] The first air-fuel ratio is an air-fuel ratio when the engine is in a lean combustion state, and the second air-fuel ratio is an air-fuel ratio when the engine is in a rich combustion state. For example, the first air-fuel ratio can be an air-fuel ratio between 29.4:1 and 27.9:1, and the second air-fuel ratio can be an air-fuel ratio below 14.7:1.

[0037] Specifically, if the state of charge is not greater than the preset threshold, it indicates that the power battery cannot be used to supplement the increase of the torque. However, the fuel injection amount of the engine can be increased to increase the current engine torque to the power target torque, and at the same time, the power battery is strongly charged to make the air-fuel ratio of the engine decrease from the first air-fuel ratio to the second air-fuel ratio. It can be understood that in order to make the air-fuel ratio of the engine decrease sharply, while increasing the fuel injection amount of the engine, the intake amount can be controlled to be unchanged or slightly increased, so that the increase of the intake amount is much lower than the increase of the fuel injection amount.

[0038] According to the explanation under S110, it can be understood that the air-fuel ratio of the engine is suddenly reduced from the first air-fuel ratio to the second air-fuel ratio, and compared with the slow reduction and not large reduction (for example, more than 14.7:1), the generated nitrous oxide is obviously reduced, therefore, by increasing the fuel injection amount of the engine to suddenly reduce the air-fuel ratio, more energy is obtained, part of the energy is used to increase the engine torque to the power target torque, and the other part is used to charge the power battery, so as to avoid energy waste and reduce environmental pollution while reaching the acceleration working condition.

[0039] The vehicle air-fuel ratio adjustment method provided in the embodiment can reduce the emission of nitrous oxide when the vehicle torque increases, and reduce the pollution to the environment. x In the case that the temperature corresponding to the trap is in the preset temperature range and the accelerator pedal opening degree increases, the current engine torque and the power target torque are determined, and the increasing mode of the vehicle torque is determined according to the state of charge of the power battery. If the state of charge is greater than the preset threshold, the difference between the power target torque and the current engine torque is taken as the target output torque, and the power battery is powered to make the electric motor output the target output torque, so as to achieve the purpose of increasing the vehicle torque, and avoid excessive emission of nitrous oxide caused by increasing the fuel injection amount. If the state of charge is not greater than the preset threshold, the fuel injection amount of the engine is increased to control the engine to increase from the current engine torque to the power target torque, and the engine is controlled to charge the power battery, so that the air-fuel ratio of the engine is reduced from the first air-fuel ratio to the second air-fuel ratio, to achieve the purpose of sudden reduction of the air-fuel ratio, greatly reduce the emission of nitrous oxide, and achieve the effect of reducing the pollution to the environment when the vehicle torque increases.

[0040] Figure 2 The flowchart of another vehicle air-fuel ratio adjustment method provided in the embodiment is based on the above-mentioned embodiments, and the disposal modes of various situations after the vehicle torque increases are optionally added, and these modes are exemplarily described. The explanations of the same or corresponding terms as those in the above-mentioned embodiments are not repeated here. As shown in the flowchart of the method, Figure 2 The method can specifically include the following steps:

[0041] S210, detecting the lean NOx trap under the condition that the temperature corresponding to the trap is in the preset temperature range and the accelerator pedal opening degree increases. x In the case that the temperature corresponding to the trap is in the preset temperature range and the accelerator pedal opening degree increases, the current engine torque and the state of charge of the power battery are obtained, and the power target torque is determined.

[0042] S220, judging whether the state of charge is greater than the preset threshold. If yes, S230 is executed, and if no, S270 is executed.

[0043] S230, taking the difference between the power target torque and the current engine torque as a target output torque, and supplying power to the motor by the power battery to make the motor output the target output torque.

[0044] S240, judging whether the duration of the increase in the accelerator pedal opening degree reaches a preset duration, if yes, performing S250, and if no, performing S260.

[0045] The preset duration can be used to judge whether the working condition of the increase in the accelerator pedal opening degree is continuous or temporary. If the duration of the increase in the accelerator pedal opening degree reaches the preset duration, it indicates that the increase in the accelerator pedal opening degree is continuous, and the power battery cannot be used for a long time to supplement the increase in torque, and subsequent measures need to be taken. For example, the preset duration can be 2s, which can be set according to actual needs.

[0046] S250, synchronously increasing the air intake amount and the fuel injection amount of the engine according to the first air-fuel ratio until the engine torque increases from the current engine torque to the power target torque.

[0047] The first air-fuel ratio is the air-fuel ratio of the engine in a lean combustion state, which can be understood as the current air-fuel ratio of the engine.

[0048] Specifically, in this case, it indicates that the engine torque needs to be increased by increasing the fuel amount to avoid long-term use of the power battery to increase the torque. In order to reduce the emission of nitrous oxide, it is necessary to avoid the change of the air-fuel ratio of the engine from the lean combustion state to the rich combustion state. Therefore, according to the first air-fuel ratio, the air intake amount and the fuel injection amount of the engine are synchronously increased to stabilize the air-fuel ratio of the engine. When the torque of the engine increases from the current engine torque to the power target torque, the process of synchronously increasing the air intake amount and the fuel injection amount of the engine is stopped, that is, the vehicle can maintain the power target torque to travel.

[0049] On the basis of the above examples, the power battery can be continuously adjusted to supplement the part of the torque that is lacking via the motor, which can be specifically:

[0050] In the process of synchronously increasing the air intake amount and the fuel injection amount of the engine, the real-time engine torque is obtained; the real-time output torque is determined according to the real-time engine torque and the power target torque, and the power battery is supplied to the motor to make the motor output the real-time output torque.

[0051] The real-time engine torque can be the real-time torque in the process of increasing the torque of the engine. The real-time output torque can be the torque supplemented by the motor supplied by the power battery in real time.

[0052] Specifically, in the process of synchronously increasing the intake amount and the fuel injection amount of the engine, the engine torque gradually increases, so that the real-time engine torque can be obtained, and the real-time torque that the power battery needs to supplement to the electric motor via the electric motor, i.e., the real-time output torque, can be determined according to the difference between the power target torque and the real-time engine torque. Further, the power battery is controlled to supply power to the electric motor so that the electric motor outputs the real-time output torque, and further so that the engine and the power battery jointly output the power target torque, thereby avoiding the situation of power shortage caused by the sudden withdrawal of the power battery.

[0053] It should be noted that due to the structure of the engine, the fuel injection amount can be instantaneously greatly increased, but the intake amount cannot be instantaneously greatly increased in coordination with the fuel injection amount, so that if the fuel injection amount is directly increased to the requirement of the power target torque, the intake amount cannot be synchronized, the air-fuel ratio fluctuates, and a large amount of nitrous oxide is generated. Accordingly, under the supplement torque of the power battery, the intake amount and the fuel injection amount of the engine are increased in accordance with the first air-fuel ratio, the air-fuel ratio is maintained, and the emission of nitrous oxide is reduced.

[0054] S260, in the case where it is detected that the accelerator pedal opening degree is unchanged, the power battery is controlled to stop supplying power to the electric motor.

[0055] Specifically, if the duration of the increase in the accelerator pedal opening degree does not reach the preset duration and it is detected that the accelerator pedal opening degree is unchanged, it indicates that the working condition of the increase in the accelerator pedal opening degree is a temporary working condition, and the original working condition has also been restored, at this time, it indicates that the power battery does not need to output torque again, the power battery can be controlled to stop supplying power to the electric motor, so that the electric motor stops outputting the target output torque, so that the torque of the vehicle is reduced by the target output torque, and returns to the current engine torque.

[0056] S270, the fuel injection amount of the engine is increased, the engine is controlled to increase from the current engine torque to the power target torque, and the engine is controlled to charge the power battery, so that the air-fuel ratio of the engine decreases from the first air-fuel ratio to the second air-fuel ratio.

[0057] S280, in the case where it is detected that the accelerator pedal opening degree is unchanged, the fuel injection amount of the engine is reduced, the engine is controlled to stop charging the power battery, and the engine is controlled to decrease from the power target torque to the current engine torque, so that the air-fuel ratio of the engine increases from the second air-fuel ratio to the first air-fuel ratio.

[0058] Specifically, in the case where it is detected that the accelerator pedal opening degree is unchanged, it indicates that the acceleration working condition stops, the fuel injection amount of the engine can be reduced to reduce the power of the engine, so that the air-fuel ratio of the engine increases from the second air-fuel ratio to the first air-fuel ratio. Further, due to the reduction in power, charging of the power battery can be stopped, and the engine is controlled to decrease from the power target torque to the current engine torque, so that the working condition of sudden acceleration returns to the original working condition.

[0059] S290, in the case of detecting that the power battery charging is completed, reducing the fuel injection amount of the engine, increasing the air intake amount of the engine, controlling the engine to stop charging the power battery, so that the air-fuel ratio of the engine is increased from the second air-fuel ratio to the first air-fuel ratio.

[0060] Specifically, in the case of detecting that the power battery charging is completed, it indicates that there is no need to continue to use the engine to charge the power battery, therefore, the engine can be controlled to stop charging the power battery. In this case, the demand for energy generation of the engine decreases, therefore, the fuel injection amount of the engine can be reduced, the air intake amount of the engine can be increased, so that the engine is in a state of meeting the power target torque and increasing the air-fuel ratio of the engine, i.e. from the second air-fuel ratio to the first air-fuel ratio, from the rich combustion state to the lean combustion state.

[0061] The vehicle air-fuel ratio adjustment method provided by the embodiment, in the case of the state of charge reaching the preset threshold value, the power battery is used to increase the torque of the vehicle, and then according to the duration of the increase of the accelerator pedal opening degree, it is judged whether the increase of the torque of the vehicle is temporary or continuous. If the duration of the increase of the accelerator pedal opening degree reaches the preset duration, the air intake amount and the fuel injection amount of the engine are simultaneously increased according to the first air-fuel ratio, until the current engine torque of the engine is increased to the power target torque, so as to increase the torque of the vehicle while keeping the air-fuel ratio, avoiding the generation of a large amount of nitrous oxide. In the case of the duration of the increase of the accelerator pedal opening degree not reaching the preset duration and detecting that the accelerator pedal opening degree is unchanged, the power battery is controlled to stop supplying power to the motor, so as to quickly restore the original working condition of the vehicle. In the case of the state of charge not reaching the preset threshold value, after the engine simultaneously increases the torque and charges the power battery, if the power battery charging is completed, the fuel injection amount and the air intake amount of the engine can be adjusted, and the charging of the power battery is stopped, so that the engine is recovered from the rich combustion state to the lean combustion state. If the accelerator pedal opening degree is unchanged, the fuel injection amount of the engine can be reduced, and the charging of the power battery is stopped, so that the vehicle is restored to the original working condition. The processing after the engine increases the torque is realized, the emission of nitrous oxide is reduced, and the pollution to the environment is reduced.

[0062] In some embodiments, the air-fuel ratio of the engine in the lean combustion state is, for example, between 29.4:1 and 27.9:1, i.e. in the interval of the first air-fuel ratio.

[0063] When the engine needs to increase torque suddenly due to the increase of the accelerator pedal opening, if the power battery has electricity, for example, the power battery has sufficient electricity or the power battery has enough electricity, the hybrid system can be set to increase the power supply of the power battery, so that the electric motor increases the torque through the power supply of the power battery, thereby realizing the overall power rise, and further, the engine does not need to increase the torque or reduce the air-fuel ratio. The power battery with electricity can also be expressed by a state of charge (SOC) value, for example, the SOC value is greater than 15% (the state of charge is greater than a preset threshold), and of course, the value can be changed by each enterprise or each vehicle model.

[0064] When the engine needs to increase the speed or switch to a higher torque state, in other words, the demand for torque is continuous, the high air-fuel ratio transition method can be used, that is, the air-fuel ratio of the engine is basically unchanged, and the engine air intake and fuel injection are increased synchronously to realize the torque increase or speed increase at the same speed.

[0065] When the power battery has low electricity (for example, the SOC value is less than or equal to 15%), the power battery can be set to a "strong charging mode", that is, the engine directly increases the rich air-fuel ratio to increase the torque at this time, and the air-fuel ratio of the engine is increased to a state (second air-fuel ratio) less than or equal to 14.7:1.

[0066] When the condition of needing to suddenly reduce the air-fuel ratio occurs, the engine air-fuel ratio is set to be unchanged (the engine does not increase the torque), and the power battery increases the torque through the electric motor, of course, this is when the power battery SOC meets the preset threshold. Further, when the power battery does not meet the preset threshold, the engine not only increases the torque but also efficiently charges the power battery, the purpose is to make the engine air-fuel ratio decrease to a state less than or equal to 14.7:1, so that the N2O emission amount is also greatly reduced.

[0067] It should be noted that the method of the embodiment of the present application can be executed by a single device, for example, a computer or a server, etc. The method of the embodiment of the present application can also be applied to a distributed scenario, and completed by multiple devices cooperating with each other. In this distributed scenario, one of the multiple devices can only execute one or more steps in the method of the embodiment of the present application, and the multiple devices interact with each other to complete the method.

[0068] It is to be understood that the foregoing description is directed to embodiments of the application. Various embodiments are described herein, including the best mode embodiments. However, various modifications and changes can be made within the scope of the present application. It is intended that the application embrace all such modifications and changes and, accordingly, the application to be within the scope of the following claims.

[0069] Based on the same inventive concept, the application also provides a vehicle air-fuel ratio adjusting device corresponding to the method of any of the above embodiments. Figure 3 A structural schematic diagram of a vehicle air-fuel ratio adjusting device provided by an embodiment of the application is shown in FIG. 3. Referring to FIG. 3, Figure 3 The vehicle air-fuel ratio adjusting device comprises an information acquisition module 310, a high state of charge processing module 320, and a low state of charge processing module 330.

[0070] The information acquisition module 310 is configured to acquire a current engine torque and a state of charge of a power battery when detecting that a lean NOx trap corresponding temperature is in a preset temperature range and an accelerator pedal opening degree is increased, and determine a power target torque. x The high state of charge processing module 320 is configured to, if the state of charge is greater than a preset threshold, take a difference between the power target torque and the current engine torque as a target output torque, and supply power to the electric motor by the power battery to make the electric motor output the target output torque. The low state of charge processing module 330 is configured to, if the state of charge is not greater than the preset threshold, increase an injection amount of the engine, control the engine to increase from the current engine torque to the power target torque, and control the engine to charge the power battery, so that an air-fuel ratio of the engine decreases from a first air-fuel ratio to a second air-fuel ratio. The first air-fuel ratio is an air-fuel ratio when the engine is in a lean state, and the second air-fuel ratio is an air-fuel ratio when the engine is in a rich state.

[0071] On the basis of the above example, after the power battery supplies power to the electric motor to make the electric motor output the target output torque, the device further comprises a continuous torque increase module configured to, if a continuous time length of the accelerator pedal opening degree increase reaches a preset time length, increase an air intake amount and an injection amount of the engine according to the first air-fuel ratio, until the engine increases from the current engine torque to the power target torque.

[0072] On the basis of the above examples, optionally, the device further comprises: a power battery adjustment module, configured to: in the process of synchronously increasing the intake amount and the fuel injection amount of the engine, acquire a real-time engine torque; determine a real-time output torque according to the real-time engine torque and the power target torque, and supply power to the motor by the power battery to make the motor output the real-time output torque.

[0073] On the basis of the above examples, optionally, after the power battery supplies power to the motor to make the motor output the target output torque, the device further comprises: a first accelerator stop processing module, configured to: in a case where the duration of the increase in the accelerator pedal opening degree does not reach a preset duration and it is detected that the accelerator pedal opening degree is unchanged, control the power battery to stop supplying power to the motor.

[0074] On the basis of the above examples, optionally, after the power battery supplies power to the motor to make the motor output the target output torque, the device further comprises: a first accelerator stop processing module, configured to: in a case where the duration of the increase in the accelerator pedal opening degree does not reach a preset duration and it is detected that the accelerator pedal opening degree is unchanged, control the power battery to stop supplying power to the motor.

[0075] On the basis of the above examples, optionally, after the power battery supplies power to the motor to make the motor output the target output torque, the device further comprises: a first accelerator stop processing module, configured to: in a case where the duration of the increase in the accelerator pedal opening degree does not reach a preset duration and it is detected that the accelerator pedal opening degree is unchanged, control the power battery to stop supplying power to the motor.

[0076] For the convenience of description, the above device is described in various modules in terms of functions. Of course, the functions of the modules can be implemented in one or more software and / or hardware in the implementation of the present application.

[0077] The device of the above examples is used to implement the corresponding vehicle air-fuel ratio adjustment method in any of the above examples, and has the beneficial effects of the corresponding method embodiments, which are not described here again.

[0078] Based on the same inventive concept, the application also provides an electronic device corresponding to the vehicle air-fuel ratio adjustment method of any of the above embodiments, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the vehicle air-fuel ratio adjustment method of any of the above embodiments.

[0079] Figure 4 A more specific hardware structure of an electronic device provided by the embodiment is shown, which can include a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040, and a bus 1050. The processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040 are connected to each other through the bus 1050 for internal communication within the device.

[0080] The processor 1010 can be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits, etc., for executing related programs to implement the technical solutions provided by the embodiments of the present specification.

[0081] The memory 1020 can be implemented by a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, etc. The memory 1020 can store an operating system and other application programs, and when the technical solutions provided by the embodiments of the present specification are implemented by software or firmware, the related program codes are stored in the memory 1020 and executed by the processor 1010.

[0082] The input / output interface 1030 is used to connect input / output modules to realize information input and output. The input / output modules can be configured as components in the device (not shown in the figure) or externally connected to the device to provide corresponding functions. The input device can include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output device can include a display, a speaker, a vibrator, an indicator light, etc.

[0083] The communication interface 1040 is used to connect a communication module (not shown in the figure) to realize the communication interaction between the device and other devices. The communication module can realize communication through wired means (such as USB, network cable, etc.) or through wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0084] Bus 1050 includes a path for transferring information between the various components (e.g., processor 1010, memory 1020, input / output interface 1030, and communication interface 1040) of the device.

[0085] It should be noted that although the above device only shows the processor 1010, the memory 1020, the input / output interface 1030, the communication interface 1040 and the bus 1050, in the specific implementation process, the device can also include other components necessary for normal operation. In addition, those skilled in the art can understand that the above device can also only contain the components necessary to implement the embodiments of the present application, and does not necessarily contain all the components shown in the figure.

[0086] The electronic device of the above embodiment is used to implement the corresponding vehicle air-fuel ratio adjustment method in any of the preceding embodiments, and has the beneficial effects of the corresponding method embodiments, which are not repeated here.

[0087] Based on the same inventive concept, the present application also provides a vehicle, wherein the vehicle comprises the vehicle air-fuel ratio adjustment method device as described in the above embodiments.

[0088] Based on the same inventive concept, corresponding to any of the above method embodiments, the present application also provides a computer readable storage medium, which stores computer instructions for causing the computer to execute the vehicle air-fuel ratio adjustment method as described in any of the above embodiments.

[0089] The computer readable medium of the present embodiment includes permanent and non-permanent, removable and non-removable media, which can be implemented by any method or technology to store information. The information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device, or any other non-transmission medium that can be used to store information accessible by a computing device.

[0090] The computer instructions stored in the storage medium of the above embodiment are used to cause the computer to execute the vehicle air-fuel ratio adjustment method as described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which are not repeated here.

[0091] Those of ordinary skill in the art will realize that the foregoing discussion of any of the embodiments has been presented for the purpose of illustration and description and is not intended to be exhaustive or to limit the application to the precise forms described, and that various adaptations and modifications are possible within the scope and spirit of the application. For example, while the embodiments discussed above have been described in the context of a memory device, other memory architectures (e.g., dynamic RAM (DRAM)) can use the embodiments discussed.

[0092] In addition, to simplify the description and discussion, and so as not to make the embodiments of the application difficult to understand, the well-known power / ground connections to integrated circuit (IC) chips and other components can or can not be shown in the provided drawings. Further, devices can be shown in block diagram form so as not to make the embodiments of the application difficult to understand, and this also takes into account the fact that details regarding implementation of these block diagram devices are highly dependent on the platform in which the embodiments of the application are to be implemented (i.e., these details should be well within the understanding of one of ordinary skill in the art). Where specific details (e.g., circuitry) are set forth in order to describe an illustrative embodiment of the application, it should be apparent to one of ordinary skill in the art that the embodiments of the application can be practiced without or with variations of these specific details. Thus, the description should not be considered to be limiting in nature.

[0093] While the application has been described in connection with specific embodiments thereof, it will be understood that many modifications, variations and alternatives will be apparent to those skilled in the art as a result of the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) can use the embodiments discussed.

[0094] It is therefore intended that the embodiments of the application embrace all such alternatives, modifications and variations as falling within the broad scope of the appended claims. Accordingly, any and all departures from the above described embodiments are intended to be included within the scope of the application as defined by the following claims.

Claims

1. A vehicle air-fuel ratio adjustment method characterized by comprising: The method comprises the following steps: In the case where the lean NOx sensor 20 detects the lean NOx x In the case where the temperature of the trap corresponds to the preset temperature range and the accelerator pedal opening is detected to increase, the current engine torque and the state of charge of the power battery are acquired, and the power target torque is determined. If the state of charge is greater than a preset threshold, a difference between the power target torque and the current engine torque is taken as a target output torque, and the power battery is used to supply power to the motor so that the motor outputs the target output torque; If the duration of the increase of the accelerator pedal opening degree reaches a preset duration, the intake air amount and the fuel injection amount of the engine are simultaneously increased according to a first air-fuel ratio until the engine increases from the current engine torque to the power target torque; If the state of charge is not greater than the preset threshold, the fuel injection amount of the engine is increased, the engine is controlled to increase from the current engine torque to the power target torque, and the engine is controlled to charge the power battery so that the air-fuel ratio of the engine decreases from a first air-fuel ratio to a second air-fuel ratio; the first air-fuel ratio is an air-fuel ratio when the engine is in a lean combustion state, and the second air-fuel ratio is an air-fuel ratio when the engine is in a rich combustion state; In a case where it is detected that the charging of the power battery is completed, the fuel injection amount of the engine is decreased, the intake air amount of the engine is increased, the engine is controlled to stop charging the power battery, and the air-fuel ratio of the engine is controlled to increase from the second air-fuel ratio to the first air-fuel ratio.

2. The method of claim 1, wherein, The method further comprises the following steps: In the process of simultaneously increasing the intake air amount and the fuel injection amount of the engine, a real-time engine torque is obtained; According to the real-time engine torque and the power target torque, a real-time output torque is determined, and the power battery is used to supply power to the motor so that the motor outputs the real-time output torque.

3. The method of claim 1, wherein, After the power battery is used to supply power to the motor so that the motor outputs the target output torque, the method further comprises the following steps: In a case where the duration of the increase of the accelerator pedal opening degree does not reach the preset duration and it is detected that the accelerator pedal opening degree is unchanged, the power battery is controlled to stop supplying power to the motor.

4. The method of claim 1, wherein, After the engine is controlled to increase from the current engine torque to the power target torque and the engine is controlled to charge the power battery, the method further comprises the following steps: In a case where it is detected that the accelerator pedal opening degree is unchanged, the fuel injection amount of the engine is decreased, the engine is controlled to stop charging the power battery, and the engine is controlled to decrease from the power target torque to the current engine torque so that the air-fuel ratio of the engine increases from the second air-fuel ratio to the first air-fuel ratio.

5. A vehicle air-fuel ratio adjusting apparatus characterized by comprising: The method comprises the following steps: The information acquisition module is configured to acquire the current engine torque and the state of charge of the power battery when it is detected that the lean NOx x When the temperature of the trap corresponds to a preset temperature range and the accelerator pedal opening is detected to increase, the current engine torque and the state of charge of the power battery are acquired, and the power target torque is determined. A high state of charge processing module is configured to, if the state of charge is greater than a preset threshold, take a difference between the power target torque and the current engine torque as a target output torque, and use the power battery to supply power to the motor so that the motor outputs the target output torque; A continuous torque increase module is configured to, if the duration of the increase of the accelerator pedal opening degree reaches a preset duration, simultaneously increase the intake air amount and the fuel injection amount of the engine according to a first air-fuel ratio until the engine increases from the current engine torque to the power target torque; A torque decrease module is configured to, in a case where it is detected that the accelerator pedal opening degree is unchanged, decrease the fuel injection amount of the engine, control the engine to stop charging the power battery, and control the engine to decrease from the power target torque to the current engine torque so that the air-fuel ratio of the engine increases from the second air-fuel ratio to the first air-fuel ratio. The low state of charge processing module is configured to increase fuel injection of the engine, control the engine to increase from the current engine torque to the power target torque, and control the engine to charge the power battery so that the air-fuel ratio of the engine decreases from a first air-fuel ratio to a second air-fuel ratio, if the state of charge is not greater than the preset threshold; the first air-fuel ratio is an air-fuel ratio when the engine is in a lean combustion state, and the second air-fuel ratio is an air-fuel ratio when the engine is in a rich combustion state; The charging completion processing module is configured to decrease fuel injection of the engine, increase air intake of the engine, and control the engine to stop charging the power battery so that the air-fuel ratio of the engine increases from the second air-fuel ratio to the first air-fuel ratio, if it is detected that the power battery is charged to completion.

6. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor implements the vehicle air-fuel ratio adjustment method according to any one of claims 1 to 4 when executing the program.

7. A computer-readable storage medium storing computer instructions, wherein, The computer instructions are used to make the computer execute the vehicle air-fuel ratio adjustment method according to any one of claims 1 to 4.

8. A vehicle characterized by comprising: The electronic device includes the vehicle air-fuel ratio adjustment apparatus according to claim 5 or the electronic device according to claim 6.

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