Hydrogen engine mixture concentration control method, device and vehicle

Abstract

This application relates to a method, apparatus, and vehicle for controlling the mixture concentration of a hydrogen engine. The method includes: obtaining a measured excess air coefficient of the hydrogen engine; if the measured excess air coefficient does not meet detection conditions, correcting the measured excess air coefficient based on the measured air-fuel ratio of the hydrogen engine to obtain a corrected excess air coefficient; and feeding the corrected excess air coefficient back to a closed-loop control execution unit, so that the closed-loop control execution unit performs closed-loop control based on the corrected excess air coefficient and a preset required excess air coefficient. This method enables zoned closed-loop control of the hydrogen engine's mixture concentration, resulting in more optimized and precise performance and emissions after achieving closed-loop control of the mixture concentration.

Description

Technical Field

[0001] This application relates to the field of hydrogen engine control technology, and in particular to a method, device and vehicle for controlling the mixture concentration of a hydrogen engine. Background Technology

[0002] With increasingly stringent requirements for energy conservation and emission reduction, hydrogen, as a clean and efficient energy source, is gradually becoming one of the important research directions for automotive power systems. Hydrogen engines, due to their primary emission being water, have the potential for zero carbon emissions and have attracted widespread attention. However, unlike traditional internal combustion engines, hydrogen engines face unique challenges in combustion control, with precise control of the air-fuel mixture concentration being particularly crucial.

[0003] Most hydrogen engine mixture concentration control technologies employ open-loop control, relying on preset calibration values ​​for engine operating conditions to adjust the hydrogen injection quantity. This approach lacks real-time feedback adjustment capabilities, making it difficult to adapt to rapid changes in engine transient conditions. This can lead to air-fuel ratio imbalances, resulting in problems such as fluctuations in power performance, excessive emissions, and even knocking. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, device, and vehicle for controlling the mixture concentration of a hydrogen engine, which can achieve closed-loop control of the mixture concentration to improve the performance of the hydrogen engine, in order to address the above-mentioned technical problems.

[0005] In a first aspect, this application provides a method for controlling the mixture concentration in a hydrogen engine. The method includes:

[0006] Obtain the measured excess air coefficient of the hydrogen engine;

[0007] If the measured excess air coefficient does not meet the detection conditions, the measured excess air coefficient is corrected based on the measured air-fuel ratio of the hydrogen engine to obtain the corrected excess air coefficient.

[0008] The corrected excess air coefficient is fed back to the closed-loop control execution unit so that the closed-loop control execution unit can perform closed-loop control based on the corrected excess air coefficient and the preset required excess air coefficient.

[0009] In one embodiment, the step of correcting the measured excess air coefficient based on the measured air-fuel ratio of the hydrogen engine to obtain a corrected excess air coefficient includes:

[0010] The compensation value is determined based on the measured air-fuel ratio of the hydrogen engine and the theoretical air-fuel ratio of hydrogen.

[0011] The corrected excess air coefficient is obtained by combining the compensation value and the measured excess air coefficient.

[0012] In one embodiment, obtaining the corrected excess air coefficient by combining the compensation value and the measured excess air coefficient includes:

[0013] Determine the contribution of the compensation value and the measured excess air coefficient to the corrected excess air coefficient, respectively.

[0014] The corrected excess air coefficient is determined based on the degree of contribution.

[0015] In one embodiment, the detection condition is used to indicate that the excess air coefficient is less than a preset detection threshold; the method further includes:

[0016] If the measured excess air coefficient meets the detection conditions, the measured excess air coefficient is fed back to the closed-loop control execution unit so that the closed-loop control execution unit can perform closed-loop control based on the measured excess air coefficient and the preset required excess air coefficient.

[0017] In one embodiment, the method further includes:

[0018] A hysteresis interval is obtained using a preset detection threshold; the preset detection threshold belongs to the hysteresis interval.

[0019] When the measured excess air coefficient exceeds the upper limit of the hysteresis interval, it is determined that the measured excess air coefficient does not meet the detection conditions;

[0020] When the measured excess air coefficient is lower than the lower limit of the hysteresis interval, it is determined that the measured excess air coefficient meets the detection condition;

[0021] When the measured excess air coefficient belongs to the hysteresis range, the current control mode remains unchanged; the control mode includes a first control mode and a second control mode, the first control mode is used to indicate that the measured excess air coefficient is fed back to the closed-loop control execution unit as a feedback value, and the second control mode is used to indicate that the corrected excess air coefficient is fed back to the closed-loop control execution unit as a feedback value.

[0022] In one embodiment, the method further includes:

[0023] When the control mode needs to be switched, determine the pre-feedback value to the closed-loop control execution unit before the switch and the current proposed feedback value to the closed-loop control execution unit.

[0024] Based on the aforementioned pre-feedback value and the proposed feedback value, the proposed feedback value is fed back to the closed-loop control execution unit using a low-pass filter.

[0025] Secondly, this application also provides a hydrogen engine mixture concentration control device. The device includes:

[0026] The acquisition module is used to acquire the measured excess air coefficient of the hydrogen engine;

[0027] The compensation module is used to correct the measured excess air coefficient based on the measured air-fuel ratio of the hydrogen engine when the measured excess air coefficient does not meet the detection conditions, so as to obtain the corrected excess air coefficient.

[0028] The feedback module is used to feed back the corrected excess air coefficient to the closed-loop control execution unit, so that the closed-loop control execution unit can perform closed-loop control according to the corrected excess air coefficient and the preset required excess air coefficient.

[0029] Thirdly, this application also provides an engine control unit. The engine control unit includes a processing unit and a closed-loop control execution unit connected to the processing unit;

[0030] The processing unit is used to perform the steps of the method provided in the first aspect of this application;

[0031] The closed-loop control execution unit is used to receive feedback values ​​from the processing unit and to perform closed-loop control of the engine's jet volume based on the feedback values ​​and a preset excess air coefficient.

[0032] Fourthly, this application also provides a computer-readable storage medium. This computer-readable storage medium stores a computer program thereon, which, when executed by a processor, implements the steps of the method described in the first aspect of this application.

[0033] Fifthly, this application also provides a computer program product. This computer program product includes a computer program that, when executed by a processor, implements the steps of the method described in the first aspect of this application.

[0034] The aforementioned hydrogen engine mixture concentration control method, device, and vehicle acquire a measured excess air coefficient of the hydrogen engine. When the measured excess air coefficient does not meet detection conditions, it is corrected based on the measured air-fuel ratio of the hydrogen engine to obtain a corrected excess air coefficient. The corrected excess air coefficient is then fed back to a closed-loop control execution unit, enabling the unit to perform closed-loop control based on the corrected excess air coefficient and a preset required excess air coefficient. Since commercially available wide-range automotive oxygen sensors struggle to meet detection accuracy requirements when the excess air coefficient exceeds a certain range, making closed-loop control of the hydrogen engine mixture concentration difficult, this application addresses this issue by using the measured air-fuel ratio to correct the measured excess air coefficient when the sensor's measured excess air coefficient indicates that the sensor currently does not meet detection accuracy requirements. This results in more optimized and accurate performance and emissions after the hydrogen engine achieves closed-loop mixture concentration control. Attached Figure Description

[0035] Figure 1 This is a diagram illustrating the application environment of a hydrogen engine mixture concentration control method in one embodiment.

[0036] Figure 2 This is a flowchart illustrating a method for controlling the mixture concentration in a hydrogen engine, as shown in one embodiment.

[0037] Figure 3 This is a flowchart illustrating the steps for obtaining the corrected excess air coefficient in one embodiment;

[0038] Figure 4 This is a flowchart illustrating a hydrogen engine mixture concentration control method in another embodiment;

[0039] Figure 5 This is a schematic diagram of a partitioned closed-loop control using a hysteresis loop in one embodiment;

[0040] Figure 6 A flowchart illustrating a hydrogen engine mixture concentration control method in another embodiment;

[0041] Figure 7 This is a structural block diagram of a hydrogen engine mixture concentration control device in one embodiment. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0043] The hydrogen engine mixture concentration control method provided in this application embodiment can be applied to, for example... Figure 1 In the application environment shown, the engine control unit (ECU) includes a processing unit 102 and a closed-loop controller execution unit 104. The processing unit 102 is connected to both the closed-loop controller execution unit 104 and the vehicle-mounted wide-range oxygen sensor 106. The vehicle-mounted wide-range oxygen sensor 106 collects the oxygen concentration signal of the exhaust gas in the exhaust pipe and sends the signal to the processing unit 102. After receiving the oxygen concentration signal, the processing unit 102 acquires data such as the current excess air coefficient and calculates a feedback value based on this data. This feedback value is then sent to the closed-loop controller execution unit 104, enabling the closed-loop controller execution unit 104 to perform closed-loop control of the hydrogen injection quantity of the electronic throttle or hydrogen injection system based on the feedback value and preset demand values.

[0044] In one embodiment, such as Figure 2 As shown, a method for controlling the mixture concentration in a hydrogen engine is provided, which can be applied to... Figure 1 Taking the processing unit 102 as an example, the following steps are included:

[0045] Step 202: Obtain the measured excess air coefficient of the hydrogen engine.

[0046] The excess air ratio (Lambda) is a parameter that describes the relationship between the actual amount of air and the theoretical amount of air (the minimum amount of air required for complete combustion) during engine combustion.

[0047] For example, the processing unit 102 receives the oxygen concentration signal sent by the vehicle wide-range oxygen sensor 106 and obtains the measured excess air coefficient of the hydrogen engine based on the oxygen concentration signal.

[0048] Step 204: If the measured excess air coefficient does not meet the detection conditions, the measured excess air coefficient is corrected based on the measured air-fuel ratio of the hydrogen engine to obtain the corrected excess air coefficient.

[0049] Among them, the detection conditions refer to the sensor's measurement range, that is, when the measurement range is exceeded, the oxygen signal data collected by the sensor cannot meet the accuracy requirements.

[0050] According to the detection characteristic curves of commercially available automotive wide-range oxygen sensors in related technologies, the pump current of the oxygen sensor gradually increases with the increase of the excess air coefficient λ. However, when the excess air coefficient λ exceeds a certain range, the growth trend of the oxygen sensor's pump current gradually flattens out. This indicates that under higher λ conditions, the oxygen sensor's sensitivity to the excess air coefficient decreases, the measurement error increases, and thus the measurement accuracy decreases, failing to meet the measurement precision requirements. Therefore, it is not feasible to achieve full-condition closed-loop measurement entirely using actual oxygen sensor measurements.

[0051] In this embodiment of the application, when the measured excess air coefficient does not meet the detection conditions, the processing unit calculates the measured air-fuel ratio of the hydrogen engine and corrects the measured excess air coefficient by combining the measured air-fuel ratio to obtain the corrected excess air coefficient.

[0052] Step 206: Feedback the corrected excess air coefficient to the closed-loop control execution unit so that the closed-loop control execution unit can perform closed-loop control based on the corrected excess air coefficient and the preset required excess air coefficient.

[0053] For example, the processing unit feeds back the corrected excess air coefficient after the measured air-fuel ratio correction to the closed-loop control execution unit, and the closed-loop control execution unit completes closed-loop control based on the corrected excess air coefficient and the preset required excess air coefficient.

[0054] In the aforementioned hydrogen engine mixture concentration control method, the measured excess air coefficient of the hydrogen engine is obtained. If the measured excess air coefficient does not meet the detection conditions, the measured excess air coefficient is corrected based on the measured air-fuel ratio of the hydrogen engine to obtain a corrected excess air coefficient. The corrected excess air coefficient is fed back to the closed-loop control execution unit, so that the closed-loop control execution unit performs closed-loop control based on the corrected excess air coefficient and the preset required excess air coefficient. Since commercially available automotive wide-range oxygen sensors will struggle to meet the detection accuracy requirements when the excess air coefficient exceeds a certain range, making it difficult to achieve closed-loop control of the hydrogen engine mixture concentration, this application embodiment, when the excess air coefficient measured by the sensor indicates that the sensor currently does not meet the detection accuracy requirements, can use the measured air-fuel ratio to correct the measured excess air coefficient, resulting in more optimized and accurate performance and emissions after the hydrogen engine achieves closed-loop control of the mixture concentration.

[0055] In one embodiment, the hydrogen engine mixture concentration control method further includes feeding back the measured excess air coefficient to the closed-loop control execution unit when the measured excess air coefficient meets the detection conditions, so that the closed-loop control execution unit performs closed-loop control based on the measured excess air coefficient and the preset required excess air coefficient.

[0056] This application embodiment employs a zoned closed-loop control method to achieve closed-loop control of the hydrogen engine's mixture concentration. The control method of this application embodiment includes a first control mode and a second control mode. The first control mode is used to instruct the measured excess air coefficient to be fed back to the closed-loop control execution unit as a feedback value, and the second control mode is used to instruct the corrected excess air coefficient to be fed back to the closed-loop control execution unit as a feedback value.

[0057] For example, when the measured excess air coefficient meets the detection conditions, i.e., the oxygen sensor meets the detection accuracy requirements, the processing unit adopts the first control mode. The processing unit calculates the measured excess air coefficient λ based on the signal collected by the oxygen sensor. LSU And the measured excess air coefficient λ LSU The measured excess air coefficient λ is fed back to the closed-loop control execution unit as feedback. LSU Excess air coefficient λ (as preset) REQ Implement closed-loop control.

[0058] For example, when the measured excess air coefficient does not meet the detection conditions, i.e., when the oxygen sensor exceeds a certain detection accuracy, the processing unit adopts the second control mode. The processing unit calculates the measured excess air coefficient λ based on the signal collected by the oxygen sensor. LSU The measured excess air coefficient λ was determined using the measured air-fuel ratio of a hydrogen engine. LSU After correction, the corrected excess air coefficient λ is obtained. calculate This will correct the excess air coefficient λ calculate The feedback value is fed back to the closed-loop control execution unit, which will then correct the excess air coefficient λ. calculate Excess air coefficient λ (as preset) REQ Implement closed-loop control.

[0059] In one alternative implementation, such as Figure 3 As shown, the measured excess air coefficient is corrected based on the measured air-fuel ratio of the hydrogen engine to obtain the corrected excess air coefficient, including:

[0060] Step 302: Determine the compensation value based on the measured air-fuel ratio of the hydrogen engine and the theoretical air-fuel ratio of hydrogen.

[0061] Step 304: Combine the compensation value and the measured excess air coefficient to obtain the corrected excess air coefficient.

[0062] In this embodiment of the application, when the measured excess air coefficient does not meet the detection conditions, a closed-loop control of the mixed gas concentration can be adopted by combining oxygen sensor measurement and model calculation.

[0063] For example, using the measured value λ from an oxygen sensor LSU λ calculated by the model mod Combined processing of λ calculate As a feedback value, it is used in conjunction with the demand value λ. REQ Implement closed-loop control.

[0064] Where, λ mod The compensation value determined by the measured air-fuel ratio of the gas engine and the theoretical air-fuel ratio of hydrogen can be expressed by the following formula: λ mod =Measured air-fuel ratio / 34 (theoretical air-fuel ratio of hydrogen). The measured air-fuel ratio can also be obtained by measuring an oxygen sensor.

[0065] The processing unit in this embodiment determines the degree of contribution of the compensation value and the measured excess air coefficient to the corrected excess air coefficient, determines the corrected excess air coefficient based on the degree of contribution, and then combines the compensation value and the measured excess air coefficient to obtain the corrected excess air coefficient.

[0066] For example, correcting the excess air coefficient λ calculate The following formula can be used:

[0067] λ calculate =α*λ LSU +(1-α)*λ mod ;

[0068] Where α represents the contribution of the measured excess air coefficient to the corrected excess air coefficient, and 1-α represents the contribution of the compensation value to the corrected excess air coefficient. That is, the proportion of the two signals is determined by α, 0≤α≤1. α can be obtained in advance based on the actual excess air coefficient.

[0069] In one embodiment, the detection conditions can be used to indicate that the excess air coefficient is less than a preset detection threshold.

[0070] The embodiments of this application can determine that the detection conditions are met when the measured excess air coefficient is less than a preset detection threshold, and determine that the detection conditions are not met when the measured excess air coefficient is greater than or equal to the preset detection threshold.

[0071] For example, the preset detection threshold can be 2.5. When the excess air coefficient value measured by the wide-range oxygen sensor is less than 2.5, the processing unit adopts the first control mode and sets the measured excess air coefficient λ of the oxygen sensor to 2.5. LSU As a feedback value, it is related to the demand value λ. REQ Closed-loop control is implemented. When the excess air coefficient measured by the wide-range oxygen sensor is greater than or equal to 2.5, the processing unit adopts the second control mode, adjusting the measured excess air coefficient λ from the oxygen sensor. LSU Values ​​and model-calculated λ mod Combined processing of λcalculate As a feedback value, it is used to perform closed-loop control with the demand value λREQ.

[0072] Currently commercially available automotive wide-range oxygen sensors typically measure a Lambda of 0.7 to 2.5 for high precision, while the Lambda of the air-fuel mixture in hydrogen engines can reach 3.5. Therefore, achieving a closed-loop control across all operating conditions using only actual oxygen sensor measurements is difficult. This application's embodiments implement oxygen sensor measurement feedback closed-loop control within the existing automotive wide-range oxygen sensor concentration control range (Lambda less than 2.5); and employ a combination of oxygen sensor measurement and model calculation for air-fuel mixture concentration closed-loop control when the oxygen sensor's accuracy range is exceeded (Lambda greater than or equal to 2.5), thereby solving the problem that current hydrogen engine air-fuel mixture concentration control can only be performed in an open-loop manner.

[0073] In one embodiment, a method for controlling the mixture concentration in a hydrogen engine is provided, such as... Figure 4 As shown, the method includes:

[0074] Step 402: Obtain the hysteresis interval using a preset detection threshold.

[0075] The preset detection threshold belongs to the hysteresis interval.

[0076] Step 404: When the measured excess air coefficient exceeds the upper limit of the hysteresis interval, it is determined that the measured excess air coefficient does not meet the detection conditions.

[0077] Step 406: When the measured excess air coefficient is lower than the lower limit of the hysteresis interval, it is determined that the measured excess air coefficient meets the detection conditions.

[0078] Step 408: When the measured excess air coefficient belongs to the hysteresis range, maintain the current control mode unchanged.

[0079] The control method includes a first control mode and a second control mode. The first control mode is used to instruct the measured excess air coefficient to be fed back to the closed-loop control execution unit as a feedback value. The second control mode is used to instruct the corrected excess air coefficient to be fed back to the closed-loop control execution unit as a feedback value. Figure 5 An exemplary schematic diagram of partitioned closed-loop control using a hysteresis loop is shown.

[0080] For example, the preset detection threshold can be 2.5, and the hysteresis interval can be a closed interval [2.5, 2.7]. When the processing unit calculates that the measured excess air coefficient is greater than 2.7 based on the oxygen concentration data collected by the oxygen sensor, it determines that the measured excess air coefficient does not meet the detection conditions. In this case, the processing unit adopts the second control mode and calculates the corrected excess air coefficient as a feedback value to the closed-loop control execution unit. When the processing unit calculates that the measured excess air coefficient is less than 2.5 based on the oxygen concentration data collected by the oxygen sensor, it determines that the measured excess air coefficient meets the detection conditions. In this case, the processing unit adopts the first control mode and feeds the measured excess air coefficient as a feedback value to the closed-loop control execution unit. When the processing unit calculates that the measured excess air coefficient belongs to the closed interval [2.5, 2.7] based on the oxygen concentration data collected by the oxygen sensor, it determines the current control mode (i.e., the mode adopted in the previous control) and keeps the current control mode unchanged.

[0081] For example, if the measured excess air coefficient is greater than 2.7, the processing unit adopts the second control mode. If the measured excess air coefficient is 2.6 at the next moment, the processing unit will still adopt the second control mode. If the measured excess air coefficient is less than 2.5, the processing unit adopts the first control mode. If the measured excess air coefficient is 2.6 at the next moment, the processing unit will still adopt the first control mode.

[0082] The embodiments of this application can use a hysteresis loop to prevent the transition between the two control modes, so that the two control modes transition using a hysteresis loop.

[0083] In one embodiment, a method for controlling the mixture concentration in a hydrogen engine is provided, such as... Figure 6 As shown, the method includes:

[0084] Step 602: If the control mode needs to be switched, determine the pre-feedback value to the closed-loop control execution unit before the switch and the current proposed feedback value to the closed-loop control execution unit.

[0085] Step 604: Based on the previous feedback value and the proposed feedback value, the proposed feedback value is fed back to the closed-loop control execution unit in a low-pass filtering manner.

[0086] In this embodiment, a low-pass filter is used for the feedback signals of the two control modes to ensure a smooth transition. This low-pass filter (LowpassT) can be a low-pass filter with a time constant of T.

[0087] For example, if the measured excess air coefficient is greater than 2.7, the processing unit adopts the second control mode to correct the measured excess air coefficient, obtaining the corrected excess air coefficient, and feeds it back to the closed-loop control execution unit as a feedback value. Let's assume the corrected excess air coefficient is 2.8. If, at the next moment, the measured excess air coefficient is 2.2, the processing unit needs to switch the control mode, i.e., adopt the first control mode, feeding back the measured excess air coefficient of 2.2 as the intended feedback value to the closed-loop control execution unit. At this point, to ensure a smooth transition of feedback values ​​between the two control modes, the processing unit can use a low-pass filter module to send progressively decreasing feedback values ​​in the discrete time domain based on the previous feedback value 2.8 and the current proposed feedback value 2.2. For example, when the processing unit switches control modes, it sends the measured excess air coefficient 2.2 to the processing unit's low-pass filter module. Based on the previous feedback value 2.8 and the current proposed feedback value 2.2, the processing unit's low-pass filter module sequentially sends 2.7, 2.6, 2.5, 2.4, 2.3, and 2.2 to the closed-loop control execution unit in the discrete time domain.

[0088] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0089] Based on the same inventive concept, this application also provides a hydrogen engine mixture concentration control device for implementing the aforementioned hydrogen engine mixture concentration control method. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations of one or more embodiments of the hydrogen engine mixture concentration control device provided below can be found in the limitations of the hydrogen engine mixture concentration control method described above, and will not be repeated here.

[0090] In one embodiment, such as Figure 7 As shown, a hydrogen engine mixture concentration control device is provided, including an acquisition module 702, a compensation module 704, and a feedback module 706, wherein:

[0091] The acquisition module 702 is used to acquire the measured excess air coefficient of the hydrogen engine.

[0092] The compensation module 704 is used to correct the measured excess air coefficient based on the measured air-fuel ratio of the hydrogen engine when the measured excess air coefficient does not meet the detection conditions, so as to obtain the corrected excess air coefficient.

[0093] Feedback module 706 is used to feed back the corrected excess air coefficient to the closed-loop control execution unit, so that the closed-loop control execution unit can perform closed-loop control according to the corrected excess air coefficient and the preset required excess air coefficient.

[0094] Each module in the aforementioned hydrogen engine mixture concentration control device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the computer device's memory as software, so that the processor can call and execute the corresponding operations of each module.

[0095] In one embodiment, this application provides an engine control unit, which includes a processing unit and a closed-loop control execution unit connected to the processing unit.

[0096] This processing unit is used to perform the steps of the above-described hydrogen engine mixture concentration control method.

[0097] The closed-loop control execution unit is used to receive feedback values ​​from the processing unit and perform closed-loop control of the engine's jet volume based on the feedback values ​​and the preset excess air coefficient.

[0098] In one embodiment, this application also provides a mixture concentration control system, which includes the aforementioned engine control unit and a vehicle-grade wide-range oxygen sensor.

[0099] In this embodiment, the oxygen sensor is installed from directly above the exhaust tailpipe downwards, away from the engine end without affecting sensor responsiveness. The wide-range oxygen sensor operates at approximately 780°C during normal operation, a temperature close to the auto-ignition point of hydrogen. If the sensor is in a high-concentration hydrogen environment, heating it could trigger localized exhaust gas detonation, affecting system safety. Therefore, by installing the sensor from directly above the exhaust tailpipe downwards, and away from the engine end without affecting sensor responsiveness, the problem of detonation caused by the oxygen sensor heating and igniting hydrogen in the exhaust gas is solved.

[0100] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps in the above method embodiments.

[0101] In one embodiment, a vehicle is provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0102] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of related data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0103] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0104] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for controlling the mixture concentration in a hydrogen engine, characterized in that, The method includes: Obtain the measured excess air coefficient of the hydrogen engine; If the measured excess air coefficient does not meet the detection conditions, the measured excess air coefficient is corrected based on the measured air-fuel ratio of the hydrogen engine to obtain the corrected excess air coefficient. The corrected excess air coefficient is fed back to the closed-loop control execution unit so that the closed-loop control execution unit performs closed-loop control based on the corrected excess air coefficient and the preset required excess air coefficient. The step of correcting the measured excess air coefficient based on the measured air-fuel ratio of the hydrogen engine to obtain the corrected excess air coefficient includes: The compensation value is determined based on the measured air-fuel ratio of the hydrogen engine and the theoretical air-fuel ratio of hydrogen. The corrected excess air coefficient is obtained by combining the compensation value and the measured excess air coefficient. The step of combining the compensation value and the measured excess air coefficient to obtain the corrected excess air coefficient includes: Determine the contribution of the compensation value and the measured excess air coefficient to the corrected excess air coefficient, respectively. The corrected excess air coefficient is determined based on the degree of contribution. The detection conditions are used to indicate that the excess air coefficient is less than a preset detection threshold; the method further includes: If the measured excess air coefficient meets the detection conditions, the measured excess air coefficient is fed back to the closed-loop control execution unit so that the closed-loop control execution unit can perform closed-loop control based on the measured excess air coefficient and the preset required excess air coefficient.

2. The method according to claim 1, characterized in that, The method further includes: A hysteresis interval is obtained using a preset detection threshold; the preset detection threshold belongs to the hysteresis interval. When the measured excess air coefficient exceeds the upper limit of the hysteresis interval, it is determined that the measured excess air coefficient does not meet the detection conditions; When the measured excess air coefficient is lower than the lower limit of the hysteresis interval, it is determined that the measured excess air coefficient meets the detection condition; When the measured excess air coefficient belongs to the hysteresis range, the current control mode remains unchanged; the control mode includes a first control mode and a second control mode, the first control mode is used to indicate that the measured excess air coefficient is fed back to the closed-loop control execution unit as a feedback value, and the second control mode is used to indicate that the corrected excess air coefficient is fed back to the closed-loop control execution unit as a feedback value.

3. The method according to claim 2, characterized in that, The method further includes: When the control mode needs to be switched, determine the pre-feedback value to the closed-loop control execution unit before the switch and the current proposed feedback value to the closed-loop control execution unit. Based on the aforementioned pre-feedback value and the proposed feedback value, the proposed feedback value is fed back to the closed-loop control execution unit using a low-pass filter.

4. A hydrogen engine mixture concentration control device, characterized in that, The device includes: The acquisition module is used to acquire the measured excess air coefficient of the hydrogen engine; The compensation module is used to correct the measured excess air coefficient based on the measured air-fuel ratio of the hydrogen engine when the measured excess air coefficient does not meet the detection conditions, so as to obtain the corrected excess air coefficient. The feedback module is used to feed back the corrected excess air coefficient to the closed-loop control execution unit, so that the closed-loop control execution unit can perform closed-loop control according to the corrected excess air coefficient and the preset required excess air coefficient. The step of correcting the measured excess air coefficient based on the measured air-fuel ratio of the hydrogen engine to obtain the corrected excess air coefficient includes: The compensation value is determined based on the measured air-fuel ratio of the hydrogen engine and the theoretical air-fuel ratio of hydrogen. The corrected excess air coefficient is obtained by combining the compensation value and the measured excess air coefficient. The step of combining the compensation value and the measured excess air coefficient to obtain the corrected excess air coefficient includes: Determine the contribution of the compensation value and the measured excess air coefficient to the corrected excess air coefficient, respectively. The corrected excess air coefficient is determined based on the degree of contribution. The detection conditions are used to indicate that the excess air coefficient is less than a preset detection threshold; the feedback module is also used for: If the measured excess air coefficient meets the detection conditions, the measured excess air coefficient is fed back to the closed-loop control execution unit so that the closed-loop control execution unit can perform closed-loop control based on the measured excess air coefficient and the preset required excess air coefficient.

5. An engine control unit, characterized in that, It includes a processing unit and a closed-loop control execution unit connected to the processing unit; The processing unit is used to perform the steps of the method according to any one of claims 1 to 3; The closed-loop control execution unit is used to receive feedback values ​​from the processing unit and to perform closed-loop control of the engine's jet volume based on the feedback values ​​and a preset excess air coefficient.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 3.

7. A vehicle comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 3.

Images