Hydrogen engine mixed gas concentration control method and device and vehicle

Abstract

The invention relates to a hydrogen engine mixed gas concentration control method and device and a vehicle. The method comprises the steps that the actually-measured excess air coefficient of the hydrogen engine is obtained; under the condition that the actually-measured excess air coefficient does not meet the detection condition, the actually-measured excess air coefficient is corrected based on the actually-measured air-fuel ratio of the hydrogen engine, and a corrected excess air coefficient is obtained; and the corrected excess air coefficient is fed back to a closed-loop control execution unit, so that the closed-loop control execution unit carries out closed-loop control according to the corrected excess air coefficient and a preset required excess air coefficient. By adopting the method, the mixed gas concentration partition closed-loop control of the hydrogen engine can be realized, so that the performance emission of the hydrogen engine after the mixed gas concentration closed-loop control is realized is more optimized and more accurate.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen engine control, and in particular to a method, device and vehicle for controlling the concentration of mixed gas in a hydrogen engine. Background Art

[0002] As the requirements for energy conservation and emission reduction continue to increase, hydrogen, as a clean and efficient energy source, is gradually becoming one of the important research directions of automotive power systems. Hydrogen engines have attracted widespread attention because their emissions are mainly water and they have the potential for zero carbon emissions. However, unlike traditional internal combustion engines, hydrogen engines face unique challenges in combustion control, among which the precise control of the mixture concentration is particularly critical.

[0003] Most of the related technologies for hydrogen engine mixture concentration control use open-loop control, relying on preset calibration values ​​of engine operating conditions to adjust the amount of hydrogen injection. This method lacks real-time feedback adjustment capabilities and is difficult to adapt to rapid changes in engine transient conditions. It may cause an imbalance in the air-fuel ratio, leading to power performance fluctuations, excessive emissions, and even knocking. Summary of the invention

[0004] Based on this, it is necessary to provide a hydrogen engine mixture concentration control method, device and vehicle that can achieve closed-loop control of the hydrogen engine mixture concentration to improve the performance of the hydrogen engine in order to address the above technical problems.

[0005] In a first aspect, the present application provides a method for controlling the concentration of a hydrogen engine mixed gas. The method comprises:

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

[0007] When the measured excess air coefficient does not meet the detection condition, 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;

[0008] The corrected excess air coefficient is fed back to a closed-loop control execution unit, so that the closed-loop control execution unit performs closed-loop control according to the corrected excess air coefficient and a 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 the corrected excess air coefficient includes:

[0010] Determining a compensation value based on a measured air-fuel ratio of the hydrogen engine and a 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, combining the compensation value and the measured excess air coefficient to obtain the corrected excess air coefficient includes:

[0013] Determining the contribution of the compensation value and the measured excess air coefficient to the corrected excess air coefficient respectively;

[0014] The corrected excess air ratio is determined based on the contribution level.

[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] When the measured excess air coefficient meets the detection condition, the measured 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 according to the measured excess air coefficient and the preset required excess air coefficient.

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

[0018] Obtaining a hysteresis interval 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, determining that the measured excess air coefficient does not meet the detection condition;

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

[0021] When the measured excess air coefficient belongs to the hysteresis interval, the current control mode is kept 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 comprises:

[0023] In the case where the control mode needs to be switched, determining a pre-feedback value fed back to the closed-loop control execution unit before switching and a proposed feedback value currently proposed to be fed back to the closed-loop control execution unit;

[0024] Based on the forward 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.

[0025] In a second aspect, the present application also provides a hydrogen engine mixed gas concentration control device. The device comprises:

[0026] An acquisition module, used for acquiring a measured excess air coefficient of a hydrogen engine;

[0027] a compensation module, configured to correct the measured excess air coefficient based on the measured air-fuel ratio of the hydrogen engine to obtain a corrected excess air coefficient when the measured excess air coefficient does not meet the detection condition;

[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 performs closed-loop control according to the corrected excess air coefficient and a preset required excess air coefficient.

[0029] In a third aspect, the present 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 execute the steps of the method provided in the first aspect of the present application;

[0031] The closed-loop control execution unit is used to receive the feedback value fed back by the processing unit, and perform closed-loop control on the injection volume of the engine according to the feedback value and a preset required excess air coefficient.

[0032] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the method provided in the first aspect of the present application are implemented.

[0033] In a fifth aspect, the present application further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the method provided in the first aspect of the present application are implemented.

[0034] The above-mentioned hydrogen engine mixed gas concentration control method, device and vehicle obtain the measured excess air coefficient of the hydrogen engine; when 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 according to the corrected excess air coefficient and the preset required excess air coefficient. Since it is difficult for the commercialized automotive wide-range oxygen sensor to meet the detection accuracy conditions when the excess air coefficient exceeds a certain range, it is difficult to achieve closed-loop control of the hydrogen engine mixed gas concentration. In this application, when the excess air coefficient measured by the sensor reflects that the sensor currently does not meet the detection accuracy conditions, the measured air-fuel ratio can be used to correct the measured excess air coefficient, so that the performance emission of the hydrogen engine after the closed-loop control of the mixed gas concentration is more optimized and more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is an application environment diagram of a method for controlling the concentration of mixed gas in a hydrogen engine in one embodiment;

[0036] Figure 2 A schematic flow chart of a method for controlling the concentration of mixed gas in a hydrogen engine according to an embodiment;

[0037] Figure 3 A schematic flow chart of a step of obtaining a corrected excess air coefficient in one embodiment;

[0038] Figure 4 A schematic flow chart of a method for controlling the concentration of mixed gas in a hydrogen engine in another embodiment;

[0039] Figure 5 A schematic diagram of using a hysteresis loop to perform partition closed-loop control in one embodiment;

[0040] Figure 6 A schematic flow chart of a method for controlling the concentration of mixed gas in a hydrogen engine in another embodiment;

[0041] Figure 7 1 is a structural block diagram of a hydrogen engine mixed gas concentration control device in one embodiment. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0043] The method for controlling the concentration of a hydrogen engine mixture provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown. Among them, the engine control unit (ECU, Engine Control Unit) includes a processing unit 102 and a closed-loop controller execution unit 104, and the processing unit 102 is used to connect with the closed-loop controller execution unit 104 and the vehicle wide-band oxygen sensor 106 respectively. The vehicle wide-band oxygen sensor 106 is used to collect the oxygen concentration signal of the exhaust gas in the exhaust pipe, and send the oxygen concentration signal to the processing unit 102. After receiving the oxygen concentration signal, the processing unit 102 obtains data such as the current excess air coefficient, and calculates a feedback value based on the current excess air coefficient and other data, and sends the feedback value to the closed-loop controller execution unit 104, so that the closed-loop controller execution unit 104 can perform closed-loop control on the hydrogen injection amount of the electronic throttle or the hydrogen injection system according to the feedback value and the preset demand value.

[0044] In one embodiment, Figure 2 As shown, a method for controlling the concentration of mixed gas in a hydrogen engine is provided. Figure 1 The processing unit 102 in the embodiment is taken as an example to illustrate, and the following steps are included:

[0045] Step 202, obtaining the measured excess air coefficient of the hydrogen engine.

[0046] Among them, the Air Excess Ratio (Lambda) is a parameter that describes the relationship between the actual air volume and the theoretical air volume (the minimum air volume required for complete combustion) during the engine combustion process.

[0047] Exemplarily, the processing unit 102 receives an oxygen concentration signal sent by the vehicle wide-band oxygen sensor 106 , and obtains a measured excess air coefficient of the hydrogen engine according to the oxygen concentration signal.

[0048] Step 204, when the measured excess air coefficient does not meet the detection condition, 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.

[0049] The detection condition refers to the measurement range of the sensor, that is, when the measurement range is exceeded, the oxygen signal data collected by the sensor cannot meet the accuracy condition.

[0050] According to the detection characteristic curve of the automotive wide-range oxygen sensor in the relevant technology, as the excess air coefficient λ increases, the pump current of the oxygen sensor gradually increases. However, when the excess air coefficient λ exceeds a certain range, the growth trend of the oxygen sensor pump current gradually flattens. This shows that under higher λ conditions, the oxygen sensor's measurement sensitivity to the excess air coefficient decreases, and the measurement error increases, resulting in reduced measurement accuracy and failure to meet the measurement accuracy requirements. It is not possible to perform a full-condition closed loop using only actual oxygen sensor measurements.

[0051] In the embodiment of the present 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, corrects the measured excess air coefficient based on the measured air-fuel ratio, and obtains the corrected excess air coefficient.

[0052] Step 206 , feeding back the corrected excess air coefficient to the closed-loop control execution unit, so that the closed-loop control execution unit performs closed-loop control according to the corrected excess air coefficient and the preset required excess air coefficient.

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

[0054] In the above-mentioned hydrogen engine mixed gas concentration control method, the measured excess air coefficient of the hydrogen engine is obtained; when 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 according to the corrected excess air coefficient and the preset required excess air coefficient. Since it is difficult for the commercialized automotive wide-range oxygen sensor to meet the detection accuracy conditions when the excess air coefficient exceeds a certain range, it is difficult to achieve closed-loop control of the hydrogen engine mixed gas concentration. In the embodiment of the present application, when the excess air coefficient measured by the sensor reflects that the sensor currently does not meet the detection accuracy conditions, the measured air-fuel ratio can be used to correct the measured excess air coefficient, so that the performance emission of the hydrogen engine after the closed-loop control of the mixed gas concentration is more optimized and more accurate.

[0055] In one embodiment, the hydrogen engine mixture concentration control method also 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 according to the measured excess air coefficient and the preset required excess air coefficient.

[0056] The embodiment of the present application adopts a partitioned closed-loop control method to realize the closed-loop control of the mixed gas concentration of the hydrogen engine. The control method of the embodiment of the present application 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.

[0057] For example, when the measured excess air coefficient meets the detection condition, that is, the oxygen sensor meets the detection accuracy, the processing unit adopts the first control mode. The processing unit obtains the measured excess air coefficient λ according to the signal collected by the oxygen sensor. LSU , and the measured excess air coefficient λ LSU As the feedback value, it is fed back to the closed-loop control execution unit, and the closed-loop control execution unit converts the measured excess air coefficient λ LSU Compared with the preset excess air coefficient λ REQ Perform closed loop control.

[0058] For example, when the measured excess air coefficient does not meet the detection condition, that is, when the oxygen sensor exceeds a certain detection accuracy, the processing unit adopts the second control mode. The processing unit obtains the measured excess air coefficient λ according to the signal collected by the oxygen sensor. LSU , and use the measured air-fuel ratio of the hydrogen engine to calculate the measured excess air coefficient λ LSU Correction is made to obtain the corrected excess air coefficient λ calculate , the excess air coefficient λ will be corrected calculate As the feedback value is fed back to the closed-loop control execution unit, the closed-loop control execution unit will correct the excess air coefficient λ calculate Compared with the preset excess air coefficient λ REQ Perform closed loop control.

[0059] In an optional embodiment, if Figure 3 As shown, 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, including:

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

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

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

[0063] For example, using the oxygen sensor measured value λ LSU λ calculated with the model mod Lambda for combined processing calculate As feedback value, to compare with demand value λ REQ Perform closed loop control.

[0064] Among them, 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 as follows: mod = Actual air-fuel ratio / 34 (theoretical air-fuel ratio of hydrogen). The actual air-fuel ratio can also be measured by the oxygen sensor.

[0065] The processing unit of the embodiment of the present application determines the contribution degree of the compensation value and the measured excess air coefficient to the corrected excess air coefficient respectively, determines the corrected excess air coefficient based on the contribution degree, and thus obtains the corrected excess air coefficient by combining the compensation value and the measured excess air coefficient.

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

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

[0068] Among them, 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, and α can be calibrated in advance according to the actual excess air coefficient.

[0069] In one embodiment, the detection condition may be used to indicate that the excess air ratio is less than a preset detection threshold.

[0070] The embodiment of the present application can determine that the detection condition is met when the measured excess air coefficient is less than a preset detection threshold, and determine that the detection condition is 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 value may 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 to set the measured excess air coefficient λ of the oxygen sensor to LSU As the feedback value, and the demand value λ REQ When the excess air coefficient value measured by the wide-range oxygen sensor is greater than or equal to 2.5, the processing unit adopts the second control mode and changes the measured excess air coefficient λ LSU Values ​​and model-calculated lambda mod Lambda for combined processingcalculate As a feedback value, it is used to perform closed-loop control with the demand value λREQ.

[0072] The Lambda of the currently commercialized automotive wide-range oxygen sensor with a high-precision range is usually 0.7 to 2.5, while the Lambda of the mixed gas concentration in a hydrogen engine can reach 3.5. It is difficult to achieve a closed-loop control of all operating conditions using only actual oxygen sensor measurements. The embodiment of the present application implements oxygen sensor measurement feedback closed-loop control in the existing automotive wide-range oxygen sensor concentration control range (Lambda less than 2.5) operating conditions; when the oxygen sensor accuracy range is exceeded (Lambda greater than or equal to 2.5), a closed-loop control of the mixed gas concentration combining oxygen sensor measurement and model calculation is used, thereby solving the problem that the current hydrogen engine mixed gas concentration can only be open-loop controlled.

[0073] In one embodiment, a method for controlling the concentration of a hydrogen engine mixed gas is provided. Figure 4 As shown, the method includes:

[0074] Step 402: Obtain a 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 condition.

[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 condition.

[0078] Step 408, when the measured excess air coefficient belongs to the hysteresis interval, keep the current control mode unchanged.

[0079] Among them, the control method 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. Figure 5 The schematic diagram of using a hysteresis loop to perform partition closed-loop control is shown as an example.

[0080] Exemplarily, the preset detection threshold may be 2.5, and the hysteresis interval may be a closed interval [2.5, 2.7]. When the processing unit calculates the measured excess air coefficient to be greater than 2.7 based on the oxygen concentration data collected by the oxygen sensor, it is determined that the measured excess air coefficient does not meet the detection condition, and the processing unit adopts the second control mode, calculates the corrected excess air coefficient as a feedback value and feeds it back to the closed-loop control execution unit; when the processing unit calculates the measured excess air coefficient to be less than 2.5 based on the oxygen concentration data collected by the oxygen sensor, it is determined that the measured excess air coefficient meets the detection condition, and the processing unit adopts the first control mode, and feeds the measured excess air coefficient as a feedback value and feeds it back to the closed-loop control execution unit; when the processing unit calculates the measured excess air coefficient to belong to the closed interval [2.5, 2.7] based on the oxygen concentration data collected by the oxygen sensor, the current control mode (i.e., the mode adopted in the previous control) is judged, and the current control mode is kept 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 still adopts the second control mode and remains unchanged. 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 still adopts the first control mode and remains unchanged.

[0082] The embodiment of the present application may use a hysteresis loop to prevent the jump between the two control modes, so that the two control modes use a hysteresis loop transition.

[0083] In one embodiment, a method for controlling the concentration of a hydrogen engine mixed gas is provided. Figure 6 As shown, the method includes:

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

[0085] Step 604 , based on the forward 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 the embodiment of the present application, a low-pass filter is used for the feedback signals of the two control modes to ensure a smooth transition. The low-pass filter (LowpassT) may use 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, corrects the measured excess air coefficient, obtains the corrected excess air coefficient and feeds it back to the closed-loop control execution unit as a feedback value, assuming that the corrected excess air coefficient is 2.8. At the next moment, if the measured excess air coefficient is 2.2, the processing unit needs to switch the control mode, that is, adopt the first control mode, and feed the measured excess air coefficient 2.2 as the proposed feedback value to the closed-loop control execution unit. At this time, in order to ensure a smooth transition of the feedback values ​​of the two control methods, the processing unit can use the low-pass filtering module to send gradually 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, the processing unit switches the control mode and sends the actually measured excess air coefficient 2.2 to the low-pass filtering module of the processing unit. The low-pass filtering module of the processing unit 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 in sequence based on the previous feedback value 2.8 and the current proposed feedback value 2.2.

[0088] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0089] Based on the same inventive concept, the embodiment of the present application also provides a hydrogen engine mixed gas concentration control device for implementing the above-mentioned hydrogen engine mixed gas concentration control method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in one or more embodiments of the hydrogen engine mixed gas concentration control device provided below can refer to the limitations of the hydrogen engine mixed gas concentration control method above, and will not be repeated here.

[0090] In one embodiment, Figure 7 As shown, a hydrogen engine mixed gas 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 obtain 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 to obtain a corrected excess air coefficient when the measured excess air coefficient does not meet the detection condition.

[0093] The 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 performs closed-loop control according to the corrected excess air coefficient and a preset required excess air coefficient.

[0094] Each module in the above-mentioned hydrogen engine mixed gas concentration control device can be implemented in whole or in part by software, hardware and their combination. Each of the above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

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

[0096] The processing unit is used to execute the steps of the above-mentioned hydrogen engine mixed gas concentration control method.

[0097] The closed-loop control execution unit is used to receive the feedback value fed back by the processing unit, and perform closed-loop control on the injection volume of the engine according to the feedback value and a preset required excess air coefficient.

[0098] In one embodiment, the present application also provides a mixed gas concentration control system, which includes the above-mentioned engine control unit and a vehicle wide-range oxygen sensor.

[0099] Among them, the embodiment of the present application arranges the oxygen sensor installation position from directly above the exhaust tail pipe to the bottom, and away from the engine end without affecting the sensor responsiveness. The operating temperature of the wide-band oxygen sensor during normal operation is about 780°C, which is close to the auto-ignition point of hydrogen. If the sensor is in a high-concentration hydrogen environment, it may cause local exhaust gas deflagration when heated, affecting the safety of the system. Therefore, by arranging the sensor installation position from directly above the exhaust tail pipe to the bottom, and away from the engine end without affecting the sensor responsiveness, the problem of the oxygen sensor heating and igniting the hydrogen in the exhaust gas and deflagration is solved.

[0100] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

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

[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, stored data, displayed data, 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 relevant data must comply with relevant laws, regulations and standards of relevant countries and regions.

[0103] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium 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), magnetoresistive 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. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0104] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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 above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for controlling the concentration of mixed gas in a hydrogen engine, characterized in that: The method comprises: Obtain the measured excess air coefficient of the hydrogen engine; When the measured excess air coefficient does not meet the detection condition, 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 a closed-loop control execution unit, so that the closed-loop control execution unit performs closed-loop control according to the corrected excess air coefficient and a preset required excess air coefficient.

2. The method according to claim 1, characterized in that 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: Determining a compensation value based on a measured air-fuel ratio of the hydrogen engine and a theoretical air-fuel ratio of hydrogen; The corrected excess air coefficient is obtained by combining the compensation value and the measured excess air coefficient.

3. The method according to claim 2, characterized in that The step of combining the compensation value and the measured excess air coefficient to obtain the corrected excess air coefficient comprises: Determining the contribution of the compensation value and the measured excess air coefficient to the corrected excess air coefficient respectively; The corrected excess air ratio is determined based on the contribution level.

4. The method according to claim 1, characterized in that: The detection condition is used to indicate that the excess air coefficient is less than a preset detection threshold; the method further includes: When the measured excess air coefficient meets the detection condition, the measured 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 according to the measured excess air coefficient and the preset required excess air coefficient.

5. The method according to claim 1, characterized in that The method further comprises: Obtaining a hysteresis interval 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, determining that the measured excess air coefficient does not meet the detection condition; When the measured excess air coefficient is lower than the lower limit of the hysteresis interval, determining that the measured excess air coefficient meets the detection condition; When the measured excess air coefficient belongs to the hysteresis interval, the current control mode is kept 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.

6. The method according to claim 5, characterized in that The method further comprises: In the case where the control mode needs to be switched, determining a pre-feedback value fed back to the closed-loop control execution unit before switching and a proposed feedback value currently proposed to be fed back to the closed-loop control execution unit; Based on the forward 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.

7. A hydrogen engine mixed gas concentration control device, characterized in that: The device comprises: An acquisition module, used for acquiring a measured excess air coefficient of a hydrogen engine; a compensation module, configured to correct the measured excess air coefficient based on the measured air-fuel ratio of the hydrogen engine to obtain a corrected excess air coefficient when the measured excess air coefficient does not meet the detection condition; 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 performs closed-loop control according to the corrected excess air coefficient and a preset required excess air coefficient.

8. 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 6; The closed-loop control execution unit is used to receive the feedback value fed back by the processing unit, and perform closed-loop control on the injection volume of the engine according to the feedback value and a preset required excess air coefficient.

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

10. A vehicle comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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