Method and device for determining gas demand

Abstract

The application provides a method and device for determining gas demand, which comprises: in the case that it is detected that the engine of a vehicle is in a sudden load shedding working condition, generating a first excess air coefficient control factor according to the current excess air coefficient of the engine and a preset excess air coefficient setting value; obtaining a second excess air coefficient control factor in a gas injection control system of the engine; selecting a transient correction factor from the first excess air coefficient control factor and the second excess air coefficient control factor; and determining a target gas demand of the engine according to the transient correction factor and a feedforward gas demand in the gas injection control system of the engine. The method provided by the embodiment of the application can accurately determine the gas demand, thereby improving the accuracy of the gas injection amount.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle control, in particular to a method and device for determining gas demand. BACKGROUND

[0002] With the continuous progress of the automobile industry, engine technology as the core of the automobile power system, the optimization of its performance and efficiency has become the focus of research and development. During the operation of the engine, the accurate control of the throttle valve is crucial to ensure the stability and performance of the engine. However, some throttle valves matched with the engine may have the problem of not closing tightly in actual operation, which may cause the gas to continue entering the cylinder for combustion when the engine is running under low working conditions, thereby causing a series of problems.

[0003] When the throttle valve should be completely closed in theory to cut off the intake, due to the incomplete closing, the gas can still enter the cylinder through the gap of the throttle valve, mix with the residual mixture in the cylinder and participate in combustion. At this time, the normal operation state of the engine is disturbed, so that the gas demand cannot be accurately determined, the injection accuracy of the gas valve is reduced, and the situation of excessive gas injection is prone to occur.

[0004] After the excessive gas enters the cylinder, the mixture formed by mixing with the air is too rich, and the combustion is insufficient, which may even cause cylinder misfire. These incompletely combusted mixtures continue to burn in the exhaust pipe after entering the exhaust pipe, forming gas afterburning. Gas afterburning not only causes the "explosion" sound in the exhaust pipe, but also may cause damage to the exhaust pipe, seriously affecting the emission performance and operation stability of the engine. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a method and device for determining gas demand, which can accurately determine the gas demand. The specific scheme is as follows:

[0006] A method for determining gas demand, comprising:

[0007] In the case of detecting that the engine of the vehicle is in a sudden load shedding working condition, a first excess air coefficient control factor is generated according to the current excess air coefficient of the engine and a preset excess air coefficient setting value;

[0008] Obtaining a second excess air coefficient control factor in the gas injection control system of the engine;

[0009] Selecting a transient correction factor from the first excess air coefficient control factor and the second excess air coefficient control factor;

[0010] According to the transient correction factor and the feedforward gas demand in the gas injection control system of the engine, the target gas demand of the engine is determined.

[0011] The method can further include:

[0012] If the intake pipe pressure of the engine is less than a preset pressure threshold, the throttle valve setting opening of the engine is less than a preset opening threshold, the excess air coefficient collected by the oxygen sensor of the engine is in an effective state, the excess air coefficient is less than a preset excess air coefficient threshold, and the engine is in a start completion state, it is determined that the engine of the vehicle is in a sudden load shedding condition.

[0013] The method can further include:

[0014] calculating a ratio between the current excess air coefficient of the engine and the preset excess air coefficient setting value;

[0015] The ratio is taken as the first excess air coefficient control factor.

[0016] The method can further include:

[0017] comparing the first excess air coefficient control factor and the second excess air coefficient control factor to obtain a comparison result;

[0018] selecting a transient correction factor from the first excess air coefficient control factor and the second excess air coefficient control factor according to the comparison result; the transient correction factor is the factor with the smallest value in the first excess air coefficient control factor and the second excess air coefficient control factor.

[0019] The method can further include:

[0020] multiplying the transient correction factor and the feedforward gas demand in the gas injection control system of the engine to obtain the target gas demand of the engine.

[0021] A device for determining a gas demand, comprising:

[0022] a generating unit configured to, in a case where it is detected that an engine of a vehicle is in a sudden load shedding condition, generate a first excess air coefficient control factor according to a current excess air coefficient of the engine and a preset excess air coefficient setting value.

[0023] an acquisition unit, configured to acquire a second excess air coefficient control factor in a gas injection control system of the engine;

[0024] a selection unit, configured to select a transient correction factor from the first excess air coefficient control factor and the second excess air coefficient control factor;

[0025] a determination unit, configured to determine a target gas demand of the engine according to the transient correction factor and a feedforward gas demand in the gas injection control system of the engine.

[0026] The device described above, optionally, the generation unit comprises:

[0027] The detection sub-unit is configured to determine that the engine of the vehicle is in the sudden load shedding working condition if it is detected that the intake pipe pressure of the engine of the vehicle is less than a preset pressure threshold, the throttle valve set opening of the engine is less than a preset opening threshold, the excess air coefficient collected by the oxygen sensor of the engine is in an effective state, the excess air coefficient is less than a preset excess air coefficient threshold, and the engine is in a start completion state.

[0028] The device described above, optionally, the generation unit comprises:

[0029] The first calculation sub-unit is configured to calculate a ratio between the current excess air coefficient of the engine and a preset excess air coefficient set value.

[0030] The execution sub-unit is configured to take the ratio as a first excess air coefficient control factor.

[0031] The device described above, optionally, the selection unit comprises:

[0032] The comparison unit is configured to compare the first excess air coefficient control factor and the second excess air coefficient control factor to obtain a comparison result.

[0033] The selection sub-unit is configured to select a transient correction factor from the first excess air coefficient control factor and the second excess air coefficient control factor according to the comparison result; the transient correction factor is a factor with the smallest value in the first excess air coefficient control factor and the second excess air coefficient control factor.

[0034] The device described above, optionally, the determination unit comprises:

[0035] The second calculation sub-unit is configured to multiply the transient correction factor and a feedforward gas demand in the gas injection control system of the engine to obtain the target gas demand of the engine.

[0036] Based on the above-mentioned method and device for determining the gas demand provided by the embodiment of the present application, the method comprises: in the case of detecting that the engine of the vehicle is in the transient load condition, generating a first excess air coefficient control factor according to the current excess air coefficient of the engine and the preset excess air coefficient setting value; obtaining a second excess air coefficient control factor in the gas injection control system of the engine; selecting a transient correction factor from the first excess air coefficient control factor and the second excess air coefficient control factor; and determining the target gas demand of the engine according to the transient correction factor and the feedforward gas demand in the gas injection control system of the engine. By applying the method provided by the embodiment of the present application, the gas demand can be accurately determined, so as to improve the accuracy of the gas injection amount and avoid the phenomenon of gas afterburning caused by excessive gas injection. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0038] Figure 1 The method flow chart of the method for determining the gas demand provided by the present application;

[0039] Figure 2 The flow chart of the process for selecting the transient correction factor provided by the present application;

[0040] Figure 3 The schematic diagram of the correction process of the gas demand provided by the present application;

[0041] Figure 4 The structural schematic diagram of the determination device of the gas demand provided by the present application;

[0042] Figure 5 The structural schematic diagram of the electronic device provided by the present application. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0044] In this application, the terms "comprising", "containing" or any other similar words are intended to encompass non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0045] The inventor has found that when the throttle valve should be fully closed in theory to cut off the intake, due to the poor closing, the gas can still enter the cylinder through the throttle gap, mix with the residual mixture in the cylinder and participate in combustion. At this time, the normal running state of the engine is disturbed, so that the gas demand cannot be accurately determined, the injection accuracy of the gas valve is reduced, and the gas injection amount is prone to be excessive. Especially in the sudden load shedding working condition, due to the rapid change of the working condition, the injection accuracy of the gas valve is seriously affected, and the response speed of the oxygen sensor lambda closed loop control is relatively slow under the low load working condition, and even may be switched to open loop control, so that the gas injection amount cannot be accurately regulated and controlled.

[0046] If the gas injection amount is not accurately regulated and controlled, excessive gas is prone to enter the cylinder, in which case the mixture formed by the excessive gas and air is too rich, combustion is insufficient, and even may cause cylinder misfire. These incompletely combusted mixtures continue to burn after entering the exhaust pipe, forming gas afterburning. Gas afterburning not only causes "explosion" sound in the exhaust pipe, but also may damage the exhaust pipe, seriously affecting the emission performance and running stability of the engine.

[0047] Based on this, the embodiment of the present application provides a determination method of gas demand, which can be applied to an electronic device. The electronic device can include one or more of a transmission control unit TCU, an ECU (Electronic Control Unit), a VCU (Vehicle Control Unit), an MCU (Micro Controller Unit), an HCU (Hybrid Control Unit), a server, a PC, a PAD, a mobile phone, etc. The method flowchart of the method is shown in Figure 1 The method specifically includes the following steps.

[0048] S101: In the case where it is detected that the engine of a vehicle is in a sudden load shedding working condition, a first excess air coefficient control factor is generated according to the current excess air coefficient of the engine and a preset excess air coefficient setting value.

[0049] In the embodiment, the working condition information of the vehicle can be acquired, and whether the engine of the vehicle is in the sudden load shedding condition is detected according to the working condition information; the working condition information can include at least one of an intake pipe pressure of the engine, a throttle valve set opening, an excess air coefficient collected by an oxygen sensor of the engine, a state of the excess air coefficient, and a running state of the engine.

[0050] Optionally, the sudden load shedding condition can be a condition that the engine suddenly loses or greatly reduces a load to be driven in a running process, resulting in a sharp drop in an effective working load borne by the engine; that is, a condition that an effective working load of the engine in a preset time is reduced by an amount greater than a preset threshold.

[0051] Optionally, the excess air coefficient set value can be obtained based on actual conditions.

[0052] S102: A second excess air coefficient control factor in a gas injection control system of the engine is acquired.

[0053] In the embodiment, the gas injection control system can be an open-loop gas injection control system or a closed-loop gas injection control system; that is, the second excess air coefficient control factor can be an open-loop Lambda factor or a closed-loop Lambda factor.

[0054] Optionally, the gas injection control system is a control system with a given function, which is not described herein again.

[0055] S103: A transient correction factor is selected from the first excess air coefficient control factor and the second excess air coefficient control factor.

[0056] In the embodiment, one of the first excess air coefficient control factor and the second excess air coefficient control factor can be selected as the transient correction factor.

[0057] Optionally, the transient correction factor can be the minimum factor of the first excess air coefficient control factor and the second excess air coefficient control factor.

[0058] S104: A target gas demand of the engine is determined according to the transient correction factor and a feedforward gas demand in the gas injection control system of the engine.

[0059] In the embodiment, the target gas demand of the engine can be obtained by correcting the feedforward gas demand by using the transient correction factor.

[0060] Optionally, the feedforward gas demand can be calculated according to one or more of the state information of the engine, such as the intake air quantity, the engine speed, the exhaust gas temperature, the oxygen content, the engine load, and the coolant temperature.

[0061] The method provided by the embodiment of the application can accurately determine the gas demand, thereby improving the accuracy of the gas injection quantity and avoiding the gas afterburning phenomenon caused by excessive gas injection.

[0062] In some embodiments, after the target gas demand of the engine is determined, the gas valve can be adjusted according to the target gas demand, so as to adjust the gas quantity entering the engine.

[0063] Specifically, the control information such as the fuel injection time, the injection pressure, and the gas valve opening degree can be determined according to the target gas demand, and the gas valve can be controlled according to the control information such as the fuel injection time, the injection pressure, and the gas valve opening degree.

[0064] In an embodiment provided by the application, based on the above implementation process, optionally, the process of detecting that the engine of the vehicle is in the sudden load shedding condition comprises the following steps.

[0065] If it is detected that the intake pipe pressure of the engine of the vehicle is less than a preset pressure threshold, the throttle valve setting opening degree of the engine is less than a preset opening degree threshold, the excess air coefficient collected by the oxygen sensor of the engine is in an effective state, the excess air coefficient is less than a preset excess air coefficient threshold, and the engine is in a start completion state, it is determined that the engine of the vehicle is in the sudden load shedding condition.

[0066] In the embodiment, whether the intake pipe pressure of the engine of the vehicle is less than a preset pressure threshold can be detected, whether the throttle valve setting opening degree of the engine of the vehicle is less than a preset opening degree threshold can be detected, whether the excess air coefficient collected by the oxygen sensor of the engine is in an effective state can be detected, whether the excess air coefficient is less than a preset excess air coefficient threshold can be detected, and whether the engine is in a start completion state can be detected. If the above detection results are all yes, it is determined that the engine of the vehicle is in the sudden load shedding condition. The vehicle whether in the sudden load shedding condition can be accurately detected.

[0067] In an embodiment provided by the application, based on the above implementation process, optionally, the first excess air coefficient control factor is generated according to the current excess air coefficient of the engine and the preset excess air coefficient setting value, comprising the following steps.

[0068] The ratio between the current excess air coefficient of the engine and the preset excess air coefficient setting value is calculated.

[0069] The ratio is taken as the first excess air coefficient control factor.

[0070] In the embodiment, the current excess control coefficient of the engine can be collected by an oxygen sensor which can be arranged on an exhaust pipe.

[0071] The process of generating the first excess air coefficient control factor Q1 is as follows:

[0072]

[0073] Wherein, Lambda 1 is the current excess air coefficient of the engine; Lambda 0 is the preset excess air coefficient set value.

[0074] In an embodiment provided by the application, based on the above implementation process, optionally, the process of selecting the transient correction factor from the first excess air coefficient control factor and the second excess air coefficient control factor includes: Figure 2 As shown in the figure, it includes:

[0075] S201: comparing the first excess air coefficient control factor and the second excess air coefficient control factor to obtain a comparison result.

[0076] Optionally, the first excess air coefficient control factor and the second excess air coefficient control factor can be compared by a logic operator or a comparator to obtain a comparison result. The comparison result can reflect the size relationship between the first excess air coefficient control factor and the second excess air coefficient control factor.

[0077] S202: selecting a transient correction factor from the first excess air coefficient control factor and the second excess air coefficient control factor according to the comparison result; the transient correction factor is the factor with the smallest value in the first excess air coefficient control factor and the second excess air coefficient control factor.

[0078] In an embodiment provided by the application, based on the above implementation process, optionally, the process of determining the target gas demand of the engine according to the transient correction factor and the feedforward gas demand in the gas injection control system of the engine includes:

[0079] Multiplying the transient correction factor and the feedforward gas demand in the gas injection control system of the engine to obtain the target gas demand of the engine.

[0080] Referring to Figure 3A schematic diagram of a gas demand correction process provided by an embodiment of the present application is shown in the figure, wherein when conditions such as the intake pipe pressure being lower than a certain threshold value, the throttle valve set opening being smaller than a certain threshold value, the lambda measurement value being valid and lower than a certain threshold value, the engine start ending, etc. are met simultaneously, the correction of the gas demand is activated, and the calculation method of the correction factor is as follows:

[0081] The ratio of the actual lambda value to the lambda set value is calculated, the ratio is taken smaller than the lambda closed loop factor to obtain a transient correction factor, and the feedforward gas demand is corrected by using the transient correction factor. The reason for taking smaller is that the lambda closed loop factor also participates in the correction of the gas amount, and by taking smaller, the gas amount can be avoided from being excessively corrected, and the correction of the gas amount can be made more quickly, and the transient correction lag of the gas caused by the slow change of the lambda closed loop factor or the lambda open loop can be avoided.

[0082] And Figure 1 Corresponding to the method, the embodiment of the present application further provides a gas demand determination device for determining Figure 1 The specific implementation of the method, a structure schematic diagram is shown in Figure 4 As shown in the figure, specifically comprising:

[0083] The generating unit 401 is configured to generate a first excess air coefficient control factor according to the current excess air coefficient of the engine and a preset excess air coefficient set value when it is detected that the engine of the vehicle is in a sudden load shedding working condition.

[0084] The obtaining unit 402 is configured to obtain a second excess air coefficient control factor in the gas injection control system of the engine.

[0085] The selecting unit 403 is configured to select a transient correction factor from the first excess air coefficient control factor and the second excess air coefficient control factor.

[0086] The determining unit 404 is configured to determine the target gas demand of the engine according to the transient correction factor and the feedforward gas demand in the gas injection control system of the engine.

[0087] In an embodiment provided by the present application, based on the above scheme, optionally, the generating unit 401 comprises:

[0088] The detection subunit is configured to determine that the engine of the vehicle is in the sudden load shedding condition if it is detected that the intake pipe pressure of the engine of the vehicle is less than a preset pressure threshold, the throttle valve set opening of the engine is less than a preset opening threshold, the excess air coefficient collected by the oxygen sensor of the engine is in an effective state, the excess air coefficient is less than a preset excess air coefficient threshold, and the engine is in a start completion state.

[0089] In an embodiment provided by the present application, based on the above scheme, optionally, the generating unit 401 comprises:

[0090] The first calculating subunit is configured to calculate a ratio between the current excess air coefficient of the engine and a preset excess air coefficient set value.

[0091] The executing subunit is configured to take the ratio as a first excess air coefficient control factor.

[0092] In an embodiment provided by the present application, based on the above scheme, optionally, the selecting unit 403 comprises:

[0093] The comparing unit is configured to compare the first excess air coefficient control factor and the second excess air coefficient control factor to obtain a comparison result.

[0094] The selecting subunit is configured to select a transient correction factor from the first excess air coefficient control factor and the second excess air coefficient control factor according to the comparison result; the transient correction factor is the factor with the minimum value in the first excess air coefficient control factor and the second excess air coefficient control factor.

[0095] In an embodiment provided by the present application, based on the above scheme, optionally, the determining unit 404 comprises:

[0096] The second calculating subunit is configured to multiply the transient correction factor and the feedforward gas demand in the gas injection control system of the engine to obtain a target gas demand of the engine.

[0097] The specific principles and execution processes of each unit and module in the gas demand determination device disclosed in the embodiments of the present application are the same as those of the gas demand determination method disclosed in the embodiments of the present application, and can be referred to the corresponding parts in the gas demand determination method provided by the embodiments of the present application, which will not be repeated here.

[0098] The embodiments of the present application further provide a storage medium comprising stored instructions, wherein when the instructions are executed, the device where the storage medium is located is controlled to execute the above gas demand determination method.

[0099] The embodiment of the present invention further provides an electronic device, the structural diagram of which is shown in FIG. Figure 5 As shown, it specifically includes a memory 501 and one or more instructions 502, wherein the one or more instructions 502 are stored in the memory 501 and are configured to be executed by one or more processors 503 to perform the following operations:

[0100] When it is detected that the engine of the vehicle is in a sudden load unloading condition, generating a first excess air coefficient control factor according to a current excess air coefficient of the engine and a preset excess air coefficient setting value;

[0101] Obtaining a second excess air coefficient control factor in a gas injection control system of the engine;

[0102] Selecting a transient correction factor from the first excess air coefficient control factor and the second excess air coefficient control factor;

[0103] The target gas demand of the engine is determined according to the transient correction factor and the feedforward gas demand in the gas injection control system of the engine.

[0104] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similarities between the various embodiments can be referred to in conjunction with each other. For device embodiments, since they are generally similar to method embodiments, their description is relatively simple, and for relevant details, reference can be made to the description of the method embodiments.

[0105] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0106] For the convenience of description, the above device is described as being divided into various units according to their functions. Of course, when implementing the present invention, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0107] Those skilled in the art can clearly understand the present application by the description of the above embodiments. Based on such an understanding, the technical solutions of the present application can be embodied in the form of a software product, which can be stored in a storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, and the like, and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in various embodiments or some parts of the embodiments of the present application.

[0108] The above describes in detail the method for determining the gas demand provided by the present application, and the principles and implementation manners of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the present application. In summary, the content of the present description should not be understood as a limitation of the present application.

Claims

1. A method of determining a gas demand, characterized in that, The method comprises the following steps: In the case of detecting that the engine of the vehicle is in a sudden load shedding condition, a first excess air coefficient control factor is generated according to the current excess air coefficient of the engine and a preset excess air coefficient setting value; A second excess air coefficient control factor in the gas injection control system of the engine is obtained; A transient correction factor is selected from the first excess air coefficient control factor and the second excess air coefficient control factor; The target gas demand of the engine is determined according to the transient correction factor and the feedforward gas demand in the gas injection control system of the engine.

2. The method of claim 1, wherein, The process of detecting that the engine of the vehicle is in a sudden load shedding condition comprises the following steps: If the intake pipe pressure of the engine of the vehicle is less than a preset pressure threshold value, the throttle valve setting opening degree of the engine is less than a preset opening threshold value, the excess air coefficient collected by the oxygen sensor of the engine is in an effective state, the excess air coefficient is less than a preset excess air coefficient threshold value, and the engine is in a start completion state, it is determined that the engine of the vehicle is in a sudden load shedding condition.

3. The method of claim 1, wherein, The first excess air coefficient control factor is generated according to the current excess air coefficient of the engine and a preset excess air coefficient setting value, which comprises the following steps: The ratio between the current excess air coefficient of the engine and the preset excess air coefficient setting value is calculated; The ratio is taken as the first excess air coefficient control factor.

4. The method of claim 1, wherein, The transient correction factor is selected from the first excess air coefficient control factor and the second excess air coefficient control factor, which comprises the following steps: The first excess air coefficient control factor and the second excess air coefficient control factor are compared to obtain a comparison result; According to the comparison result, the transient correction factor is selected from the first excess air coefficient control factor and the second excess air coefficient control factor; the transient correction factor is the factor with the smallest value in the first excess air coefficient control factor and the second excess air coefficient control factor.

5. The method of claim 1, wherein, The target gas demand of the engine is determined according to the transient correction factor and the feedforward gas demand in the gas injection control system of the engine, which comprises the following steps: The transient correction factor is multiplied by the feedforward gas demand in the gas injection control system of the engine to obtain the target gas demand of the engine.

6. A gas demand amount determining device characterized by comprising: The method comprises the following steps: A generation unit is configured to generate a first excess air coefficient control factor according to the current excess air coefficient of the engine and a preset excess air coefficient setting value in the case of detecting that the engine of the vehicle is in a sudden load shedding condition; An acquisition unit is configured to obtain a second excess air coefficient control factor in the gas injection control system of the engine; A selection unit is configured to select a transient correction factor from the first excess air coefficient control factor and the second excess air coefficient control factor; A determination unit is configured to determine the target gas demand of the engine according to the transient correction factor and the feedforward gas demand in the gas injection control system of the engine.

7. The apparatus of claim 6, wherein, The generation unit comprises: The detection subunit is configured to determine that the engine of the vehicle is in the sudden load shedding condition if it is detected that the intake pipe pressure of the engine is less than a preset pressure threshold, a throttle valve set opening of the engine is less than a preset opening threshold, an excess air coefficient collected by an oxygen sensor of the engine is in an effective state, the excess air coefficient is less than a preset excess air coefficient threshold, and the engine is in a start completion state.

8. The apparatus of claim 6, wherein, The generation unit comprises: A first calculation subunit is configured to calculate a ratio between the current excess air coefficient of the engine and a preset excess air coefficient set value. The execution subunit is configured to take the ratio as a first excess air coefficient control factor.

9. The apparatus of claim 6, wherein, The selection unit comprises: A comparison unit is configured to compare the first excess air coefficient control factor and the second excess air coefficient control factor to obtain a comparison result. A selection subunit is configured to select a transient correction factor from the first excess air coefficient control factor and the second excess air coefficient control factor according to the comparison result; the transient correction factor is the factor with the smallest value in the first excess air coefficient control factor and the second excess air coefficient control factor.

10. The apparatus of claim 6, wherein, The determination unit comprises: A second calculation subunit is configured to multiply the transient correction factor and a feedforward gas demand in a gas injection control system of the engine to obtain a target gas demand of the engine.

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